CN113058502A - Low tower granulation system based on improve material receiving mechanism at bottom of tower - Google Patents
Low tower granulation system based on improve material receiving mechanism at bottom of tower Download PDFInfo
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- CN113058502A CN113058502A CN202110297865.9A CN202110297865A CN113058502A CN 113058502 A CN113058502 A CN 113058502A CN 202110297865 A CN202110297865 A CN 202110297865A CN 113058502 A CN113058502 A CN 113058502A
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- 239000000463 material Substances 0.000 title claims abstract description 113
- 238000005469 granulation Methods 0.000 title claims abstract description 51
- 230000003179 granulation Effects 0.000 title claims abstract description 51
- 230000007246 mechanism Effects 0.000 title claims abstract description 30
- 239000003337 fertilizer Substances 0.000 claims abstract description 103
- 238000009826 distribution Methods 0.000 claims abstract description 85
- 239000002245 particle Substances 0.000 claims abstract description 65
- 238000001816 cooling Methods 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000004537 pulping Methods 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims description 39
- 239000008187 granular material Substances 0.000 claims description 24
- 239000000155 melt Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000007791 dehumidification Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002309 gasification Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000005243 fluidization Methods 0.000 abstract description 7
- 230000003670 easy-to-clean Effects 0.000 abstract 1
- 239000000498 cooling water Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
- B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/30—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic using agents to prevent the granules sticking together; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Fertilizers (AREA)
Abstract
The invention discloses a low tower granulation system based on an improved tower bottom material receiving mechanism, which comprises a tower body, a cooling device and a belt conveyor, wherein the tower body is provided with a tower bottom material receiving mechanism; the tower body is a closed cavity, and the upper end in the tower body is provided with a centrifugal granulation assembly connected with a fertilizer pulping device; the centrifugal granulating assembly comprises a granulating disc and a rotating motor for driving the granulating disc to rotate; the cooling device is a water cooling device or an air cooling device arranged inside the tower body; the device comprises a tower body, a belt conveyor, a fluidized bucket structure, a dehumidifier and an air distribution box, wherein the fluidized bucket structure is arranged at the bottom of the tower body and is positioned above the belt conveyor, the fluidized bucket structure comprises a Roots blower, the dehumidifier and the air distribution box which are sequentially connected, the air distribution box is downwards inclined and arranged at the bottom of the tower body, the inclination angle of the air distribution box is adjustable, and the air distribution box is used for collecting fertilizer particles falling in a granulation tower; the invention has low cost, and the upper material on the air distribution box is easy to clean by adopting a fluidization material receiving mode.
Description
Technical Field
The invention relates to the technical field of fertilizer low-tower granulation equipment, in particular to a low-tower granulation system based on an improved tower bottom material receiving mechanism.
Background
In the current fertilizer tower granulation, a granulation tower with the height of 15-60 m is generally called a low tower, and a granulation tower with the height of 60-150 m is generally called a high tower; no matter the tower is a low tower or a high tower, the tower bottom material collection mainly adopts the following two modes: one adopts a cone hopper mode to receive materials, and the other adopts a tower bottom material collector to receive materials.
The cone hopper mode is adopted for receiving materials, namely a huge cone hopper is directly installed at the bottom of the tower body, fertilizer finished product particles in the granulator are gradually collected into a discharge hole at the center of the bottom along the cone hopper, and then the fertilizer finished product particles are conveyed to a subsequent working section by a belt conveyor. The most important problems of this solution are: the whole height of the cone bucket is higher, taking a high tower with the diameter of 18m as an example, the height of the cone bucket is 14-16m, and the cone bucket occupies about 1/8 of the whole height of the tower body, and the cone bucket part cannot fully exchange heat due to the small heat exchange area and only serves as a material receiving function, but the manufacturing cost of the tower body is increased by nearly 15 percent.
At present, some enterprises adopt tower bottom material collectors to collect materials at the tower bottom, and the tower bottom material collectors are mainly divided into two material collectors, wherein one material collector is a conical hopper with a small taper arranged at the bottom of a tower body, a material collecting bin is arranged at the center of the conical hopper, a screw conveyor is arranged at the upper part of the conical hopper, the screw conveyor rotates along the center of the tower body, and materials are conveyed into the material collecting bin and then conveyed to a subsequent working section by a belt conveyor in the rotating process of the screw conveyor; the disadvantages of such a collector are: a certain gap is formed between the material receiving spiral and the conical hopper, so that the materials are difficult to clean, and if the material receiving spiral is started for a long time, the materials are hard to form hard blocks and are difficult to clean; and because the hard blocks are more and more thick, the screw conveyer is easy to be blocked, and the failure rate of the equipment is high. The other material collector is characterized in that a flat rotary material collecting disc is arranged at the bottom of the tower, a fixed spiral conveyor is arranged on the disc, a material collecting hopper is arranged at the center of the rotary material collecting disc, the rotary material collecting disc continuously conveys materials falling to the upper part of the disc to the spiral conveyor, and the spiral conveyor operates to gradually convey the materials to the central material collecting hopper; the disadvantages of such a collector are: a certain gap is formed between the spiral conveyor and the rotary material receiving disc, so that the materials are difficult to clean, and if the material is hard to clean, the materials are hard to form hard blocks when the starting time is long; moreover, as the hard blocks are more and more thick, the screw conveyor is easy to block, and the failure rate of the equipment is high; and the whole material receiving disc has heavier weight, larger rotary load and higher operation cost.
Therefore, the prior art needs to be further improved, the low-tower granulation system based on the improved tower bottom material receiving mechanism is provided, materials on the material receiving disc can be cleaned up by adopting a fluidized material receiving mode, meanwhile, a cooling device of a subsequent working section is arranged at the bottom of the tower in a front mode, material receiving is completed under the condition of not increasing any load, and the low-tower granulation system has the advantages of reducing the operation cost, shortening the process route, reducing the occupied area and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low tower granulation system based on an improved tower bottom material receiving mechanism, materials on a material receiving disc can be cleaned in a fluidized material receiving mode, and meanwhile, a cooling device of a subsequent working section is arranged at the bottom of a tower in a front mode, so that material receiving is finished under the condition of not increasing any load, and the low tower granulation system has the advantages of reducing the operation cost, shortening the process route, reducing the occupied area and the like.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a low tower granulation system based on an improved tower bottom material receiving mechanism is used for manufacturing fertilizer particles and comprises a pulping system, an atomizing granulation disc, a granulation tower and a material receiving mechanism; the pulping system heats the fertilizer raw material melt, conveys the melt to an atomizing granulation disc in a tower body of a granulation tower, the atomizing granulation disc rotates at a high speed under the drive of a motor, centrifugally throws out the melt at a high speed for atomization, and the melt atomized liquid drops thrown out centrifugally are cooled and solidified into fertilizer particles through free falling bodies in the tower body and fall into a material receiving mechanism at the bottom of the tower for collection;
the material receiving mechanism arranged at the bottom of the granulation tower comprises a fan, a dehumidification module and an air distribution box which are sequentially connected;
the air distribution box is of a funnel-shaped structure, the upper end of the air distribution box is correspondingly arranged at the bottom of the granulation tower and is used for collecting fertilizer particles falling in the granulation tower; the funnel-shaped inner wall of the air distribution box is provided with a plurality of air distribution holes, the outer wall of the air distribution box is provided with an air inlet hole, and a cavity communicated with the air distribution holes and the air inlet hole is arranged between the inner wall and the outer wall;
after the fan passes through the dehumidification module, the air is blown into the cavity through the air inlet holes and is blown out from the air distribution holes; fertilizer particles falling to the inner wall of the air distribution box are in a fluidized state under the air blowing state of the air distribution holes; the lower end of the air distribution box is also provided with a material receiving port for collecting fertilizer particles flowing down on the air distribution box.
Preferably, a cooling device is arranged at the lower end in the tower body, the cooling device is a water-cooling device, and the water-cooling device comprises a water cooling tower, a water pump, an electric regulating valve and a plurality of heat exchange fins; the water cooling tower, the water pump and the electric regulating valve are arranged outside the tower body and are sequentially connected; the plurality of heat exchange fins are vertically arranged at the lower end in the tower body, two ends of each heat exchange fin are respectively connected with a water inlet main pipe and a water outlet main pipe, and the water inlet main pipe and the water outlet main pipe are respectively connected with the electric regulating valve and the water cooling tower; the utility model discloses a fertilizer drying tower, including tower body, heat exchanger fin, temperature sensor, electric control valve, temperature sensor, electric control valve, temperature value that the tower body lateral wall is last to correspond the bottom position of heat exchanger fin is equipped with temperature sensor for detect the temperature of fertilizer granule after the cooling, temperature sensor with electric control valve interlocking is connected, electric control valve basis the.
Preferably, a cooling device is arranged at the lower end inside the tower body, the cooling device is an air cooling device, and the air cooling device comprises an electric regulating valve, an induced draft fan and heat exchange fins; the electric regulating valve and the induced draft fan are arranged outside the tower body, and the electric regulating valve is connected with an inlet of the induced draft fan; the plurality of heat exchange fins are vertically arranged at the lower end in the tower body, two ends of each heat exchange fin are respectively connected with the air inlet main pipe and the air outlet main pipe, and the air inlet main pipe penetrates through the side wall of the tower body and is communicated with the outside; the electric regulating valve is connected between the air outlet main pipe and the induced draft fan; the utility model discloses a fertilizer drying tower, including tower body, heat exchanger fin, temperature sensor, electric control valve, temperature sensor, electric control valve, temperature value that the tower body lateral wall is last to correspond the bottom position of heat exchanger fin is equipped with temperature sensor for detect the temperature of fertilizer granule after the cooling, temperature sensor with electric control valve interlocking is connected, electric control valve basis the.
Preferably, the inside lower extreme of tower body has a plurality of striker plates that evenly set up downwards, and what every striker plate and horizontal direction's contained angle is 45-90, and every striker plate is detachable steel sheet and is located a plurality of the top of heat exchanger fin.
Preferably, the air distribution box is made of stainless steel, the inner wall of the air distribution box is obliquely arranged, and the included angle between the inner wall of the air distribution box and the horizontal direction is 5-45 degrees.
Preferably, the plurality of air distribution holes are uniformly arranged along a direction perpendicular to the inner wall of the air distribution box and penetrate through the inner wall of the air distribution box; the aperture of the air distribution hole is smaller than that of the air inlet hole.
Preferably, the air distribution hole is a bubble cap hole, a straight hole, a taper hole, a stacked hole formed by stacking two holes with a large inner part and a small outer part, or a micropore on the micropore gasification plate.
Preferably, the receiving port is of a conical funnel structure with a large upper part and a small lower part and is used for collecting fertilizer particles flowing down from the air distribution box and uniformly conveying the fertilizer particles downwards to the belt conveyor; the material receiving port lower extreme is equipped with the aperture governing valve for adjust the size of the load of fertilizer granule.
Preferably, a material level sensor is arranged at the lower end of the outer wall of the tower body, and a detection end of the material level sensor extends into the tower body and is used for detecting the material level of fertilizer particles; the opening adjusting valve is connected with the material level sensor in an interlocking mode, and the opening adjusting valve adjusts the discharge amount of fertilizer particles according to the material level detected by the material level sensor.
Preferably, the material diameter of the fertilizer particles is 0.5-2.5 mm.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
(1) the wind distribution box with a micro angle is adopted to replace a material receiving cone hopper, the whole height of the tower body can be reduced by 10-20m compared with the type of the material receiving cone hopper, and the construction cost of the tower body is saved by 1/10;
(2) the fluidization principle is adopted to replace the existing mechanical tower bottom material collector, so that no material accumulation is generated, no moving part is generated, and the maintenance amount is small;
(3) the rear-end fertilizer cooling device is moved forward to the bottom of the tower, fluidized air of the cooling device is utilized to fluidize fertilizer particles so as to collect materials, the whole process flow is shortened, the occupied area of the whole production line is reduced, and the investment cost and the operation cost are saved.
Drawings
FIG. 1 is a schematic view of the structure of a granulating system of example 1 of the present invention;
FIG. 2 is a structural view of an atomizing granulation disk of example 1 of the present invention;
FIG. 3 is a sectional view of a wind distribution box of example 1 of the present invention;
FIG. 4 is a schematic structural view of a granulating system of example 2 of the present invention;
FIG. 5 is a structural view of an air distribution hole of embodiment 3 of the present invention;
FIG. 6 is a structural view of an air distribution hole of embodiment 4 of the present invention;
FIG. 7 is a structural view of an air distribution hole of embodiment 5 of the present invention;
FIG. 8 is a structural view of an air distribution hole of embodiment 6 of the present invention;
FIG. 9 is a structural view of an air distribution hole of embodiment 7 of the present invention;
the technical characteristics corresponding to the marks in the attached drawings are as follows:
1-a tower body; 11-a granulating disc and 111-an upper cover plate; 112-lower cover plate; 113-a guide vane; 114-a feed inlet; 12-a striker plate; 13-a level sensor; 141-air distributing box; 141 a-air inlet holes; 141 b-air distribution holes; 142-a material receiving port; 143-roots blower; 144-a dehumidifier; 145-opening degree regulating valve; 15-conveying belt conveyer;
2 a-water cooling device
21 a-a cooling tower; 22 a-a water pump; 23 a-electric regulating valve; 24 a-a temperature sensor; 25 a-heat exchanger fins;
2 b-air cooling device;
21 b-a temperature sensor; 22 b-a draught fan; 23 b-an electric regulating valve; 24 b-heat exchanger fins;
3-falling fertilizer granules;
4-fluidized fertilizer granules;
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
example 1
As shown in fig. 1, a low tower granulation system based on an improved tower bottom material receiving mechanism is used for manufacturing fertilizer granules and comprises a pulping system, an atomizing granulation disc 11, a granulation tower 1 and a material receiving mechanism; the pulping system heats the fertilizer raw material melt, and conveys the melt to an atomizing granulation disc 11 in a tower body of a granulation tower, the atomizing granulation disc 11 rotates at a high speed under the drive of a motor, the melt is centrifugally thrown out at a high speed for atomization, the melt atomized liquid drops thrown out at the centrifugal speed are cooled and solidified into fertilizer particles through free falling bodies in the tower body, and the material diameter of the fertilizer particles is 0.5-2.5 mm. And falls into a material receiving mechanism positioned at the bottom of the tower for collection;
as shown in fig. 2, the atomizing granulation disk 11 includes an upper cover plate 111 and a lower cover plate 112 which are arranged at an interval from top to bottom, a feed inlet 114 for fertilizer melt is provided in the middle of the upper cover plate 111, and a plurality of guide vanes 113 radially distributed around the middle are provided between the upper cover plate 111 and the lower cover plate 112.
The lower end in the tower body is provided with a water-cooling device 2 a; the water-cooling device 2a comprises a water cooling tower 21a, a water pump 22a, an electric regulating valve 23a and a plurality of heat exchange fins 25 a; the water cooling tower 21a, the water pump 22a and the electric regulating valve 23a are arranged outside the tower body 1 and are sequentially connected; the plurality of heat exchange fins 25a are vertically arranged at the lower end in the tower body 1, two ends of each heat exchange fin 25a are respectively connected with a main water inlet pipe and a main water outlet pipe, and the main water inlet pipe and the main water outlet pipe are respectively connected with the electric regulating valve 23a and the water cooling tower 21 a; a temperature sensor 24a is arranged on the outer side wall of the tower body 1 corresponding to the bottom of the heat exchange plate 25a and used for detecting the temperature of the cooled fertilizer particles, the temperature sensor 24a is connected with the electric regulating valve 223a in an interlocking manner, and the electric regulating valve 23a regulates the amount of cooling water according to the temperature value detected by the temperature sensor 24 a; the inside of the heat exchange plate 25a is communicated with cooling water, the outside is fertilizer particles, and because of the temperature difference between the two, the second law of thermodynamics is followed, namely 'heat can be spontaneously transferred from an object with high temperature to a cooler object, but cannot be spontaneously transferred from an object with low temperature to an object with high temperature', and the fertilizer particles can be cooled to the required temperature by calculating the heat exchange area and the cooling water amount. The bottom among the cooling device has set up temperature sensor for detect the fertilizer granule temperature after the cooling, carry out interlocking control with the electrical control valve of adjusting the cooling water yield size, thereby realize the accurate control of fertilizer granule temperature.
As shown in fig. 1, the lower end inside the tower body 1 is provided with a plurality of baffle plates 12 which are uniformly arranged downward, an included angle between each baffle plate 12 and the horizontal direction is 45-90 °, and in this embodiment, the included angle between each baffle plate 12 and the horizontal direction is preferably 60 °; each striker plate 12 is a detachable steel plate and is located a plurality of the heat exchanging fins 25 a. The fertilizer granule 3 that is falling falls to striker plate 12 on inside falling gradually of tower body 1, and the effect of striker plate 12 is the protection bottom heat exchanger fin, avoids the fertilizer granule 3 that is falling or the bold material of granulation failure directly to drop on heat exchanger fin 25a and arouses that heat exchanger fin 25a warp, and striker plate 12 is detachable, conveniently clears up heat exchanger fin 25 a.
As shown in fig. 1, the material receiving mechanism disposed at the bottom of the tower body 1 includes a fan 143, a dehumidifying module 144, and a wind distributing box 141, which are connected in sequence; in this embodiment, the blower 143 is a roots blower, and the dehumidifying module 144 is a dehumidifier.
As shown in fig. 1, the air distribution box 141 is a funnel-shaped structure, and the upper end of the air distribution box is correspondingly installed at the bottom of the tower body and is used for collecting fertilizer particles falling in the granulation tower; the air distribution box 141 is made of stainless steel, the inner wall of the air distribution box 141 is obliquely arranged, and the included angle between the inner wall of the air distribution box 141 and the horizontal direction is 5-45 degrees, the air distribution box 141 obliquely arranged at a slight angle on the inner wall is adopted to replace the traditional material receiving cone bucket, the whole height of the tower body can be reduced by 10-20m compared with the type of the traditional material receiving cone bucket, and the construction cost of the tower body is saved by 1/10;
as shown in fig. 3, the funnel-shaped inner wall of the air distribution box 141 is provided with a plurality of air distribution holes 141b, the outer wall is provided with air inlet holes 141a, and a cavity for communicating the air distribution holes 141b and the air inlet holes 141a is arranged between the inner wall and the outer wall;
after the fan 143 passes through the dehumidifying module 144, the air is blown into the cavity through the air inlet 141a and is blown out from a plurality of air distribution holes; fertilizer particles falling to the inner wall of the air distribution box are in a fluidized state under the air blowing state of the air distribution holes; the fluidization principle is adopted to receive materials to replace the existing mechanical tower bottom material collector, so that no material accumulation is generated, no moving part is generated, and the maintenance amount is small.
As shown in fig. 3, the plurality of air distribution holes 141b are uniformly arranged in a direction perpendicular to the inner wall of the air distribution box 141 and penetrate the air distribution box 141. In this embodiment, the air distribution holes 141b are straight holes. The aperture of the air inlet hole 141a is larger than that of the air distribution hole 141 b;
as shown in fig. 1, a receiving port 142 is provided at the lower end of the air distribution box 141, the receiving port 142 is a tapered funnel structure with a large upper part and a small lower part, and the receiving port 142 serves as a buffer port for collecting fertilizer particles flowing down from the air distribution box 141 and uniformly conveying the fertilizer particles downward to the belt conveyor 15 below;
as shown in fig. 1, an opening regulating valve 145 is arranged at the lower end of the receiving opening for regulating the discharge amount of the fertilizer particles. A material level sensor 13 is arranged at the lower end of the outer wall of the tower body 1, and a detection end of the material level sensor 13 extends into the lower end in the tower body and is used for detecting the material level of fertilizer particles; the opening degree adjusting valve 145 is connected with the material level sensor 13 in an interlocking mode, and the opening degree adjusting valve 145 adjusts the discharge amount of fertilizer particles according to the material level detected by the material level sensor 13. Through install level sensor 13 that detects fertilizer granule bed of material height on tower body 1, carry out interlocking control with the aperture governing valve 145 of control fertilizer granule load to guarantee the stability of tower body 1 bottom fertilizer granule load, realize best fluidization state.
The working principle of the present invention is described in detail below:
the granulation disc 11 is in high-speed rotation under the ware drive of rotating the motor, the centrifugal force of production is thrown away the ground paste that fertilizer slurrying device carried in the tower body 1, forms the fertilizer granule of whereabouts, during the fertilizer granule after fertilizer granule 3 that is falling passes through striker plate 12 gets into water-cooling device 2a, the inside cooling water that leads to of heat exchanger fin 25a, the outside is the fertilizer granule, when the fertilizer granule flows through heat exchanger fin 25a, the inside cooling water of heat exchanger fin 25a carries out the heat exchange with the outside fertilizer granule of heat exchanger fin owing to there is the temperature difference to cool off the fertilizer granule to required temperature. The temperature of the cooling water is increased after heat exchange with fertilizer particles in the heat exchange fins 25a, and the cooling water is cooled by a water cooling tower 21a and then is conveyed into the heat exchange fins 25a through a water pump 22a to complete an internal circulation; an electric regulating valve for regulating the water quantity is arranged on an outlet pipeline of the water pump 22a, a temperature sensor 24a for detecting the temperature of fertilizer particles is arranged on the tower body, the electric regulating valve 23a is opened when the temperature of the fertilizer particles is higher than the required temperature, the cooling water quantity is increased, the fertilizer particles can be fully cooled, and the opening of the electric regulating valve 23a is reduced when the temperature of the fertilizer particles is lower than the required temperature, the cooling water quantity is reduced, and the fertilizer particles are not too low in temperature;
the fertilizer particles are cooled by the water-cooling device 2a and then fall onto the air distribution box 141, the fertilizer particles on the air distribution box 141 are in a fluidized state under the action of fluidized air, and the air pressure and the air volume of the Roots blower 143 are scientifically calculated to meet the fluidization requirement of the fertilizer particles; the Roots blower 143 sucks air from the outside air, pressurizes the air to a required pressure, dehumidifies the air by the dehumidifier 144, removes moisture in the air, and dry air from which the moisture in the air is removed is directly sent into the air distribution box 141, passes through the upper hole of the air distribution box 141, enters the tower body 1, and contacts with fertilizer particles, and the fertilizer particles are in a fluidized state under the action of the air.
The fertilizer particles in the fluidized state move to the central position along the air distributing box 141 due to the fluidization effect and are collected into the receiving port 142, and the fertilizer particles are sent to the belt conveyor 15 after passing through the opening regulating valve 145. The more the fluidized fertilizer particles are, the larger the wind pressure of the fluidized Roots fan 143 is, when the required wind pressure exceeds the maximum wind pressure of the Roots fan 143, the fertilizer particles cannot be in a fluidized state, and at the moment, the material cannot flow out along the material receiving port 142, so that the amount of the fertilizer particles in the tower body 1 needs to be controlled, when the material level of the fluidized fertilizer particles exceeds a set height, the material level sensor 13 transmits a signal to the opening degree adjusting valve 145, the opening degree of the opening degree adjusting valve 145 is increased, and the discharge amount is increased; when the fluidized fertilizer particle material level is lower than the set height, the material level sensor 13 transmits a signal to the opening degree adjusting valve 145, the opening degree of the opening degree adjusting valve 145 is reduced, and the discharge amount is reduced, so that the total amount of the fertilizer particles in the fluidized state is ensured to be unchanged and to be in the optimal fluidized state.
The invention has the following advantages:
(1) the wind distribution box with a micro angle is adopted to replace a material receiving cone hopper, the whole height of the tower body can be reduced by 10-20m compared with the type of the material receiving cone hopper, and the construction cost of the tower body is saved by 1/10;
(2) the fluidization principle is adopted to replace the existing mechanical tower bottom material collector, so that no material accumulation is generated, no moving part is generated, and the maintenance amount is small;
(3) the rear-end fertilizer cooling device is moved forwards to the bottom of the tower, and after the fertilizer particles are cooled by the water-cooling device, the fertilizer particles are fluidized by fluidized air of the material receiving structure so as to collect materials, so that the whole process flow is shortened, the occupied area of the whole production line is reduced, and the investment cost and the operation cost are saved.
Example 2
As shown in fig. 4, the main technical solution of this embodiment and the features of embodiment 1 that are not explained in this embodiment adopt the explanations in embodiment 1, and are not described again here. This example differs from example 1 in that: the lower end in the tower body is provided with an air cooling device 2b, and the air cooling device 2b comprises an induced draft fan 22b, an electric regulating valve 23b and heat exchange fins 24 b; the induced draft fan 22b and the electric regulating valve 23b are arranged outside the tower body, and the electric regulating valve 23b is connected with an inlet of the induced draft fan 22 b; the plurality of heat exchange fins 24b are vertically arranged at the lower end inside the tower body 1, two ends of each heat exchange fin 24b are respectively connected with an air inlet main pipe and an air outlet main pipe, and the air inlet main pipe penetrates through the side wall of the tower body 1 and is communicated with the outside; the air outlet main pipe is connected with the electric regulating valve 23 b; a temperature sensor 21b is arranged on the outer side wall of the tower body 1 corresponding to the heat exchange plate 24b and used for detecting the temperature of the cooled fertilizer particles, the temperature sensor 21b is connected with the electric regulating valve 23b in an interlocking manner, and the electric regulating valve 23b regulates the cooling air volume according to the temperature value detected by the temperature sensor 21 b; the heat exchange fins 24b are connected with normal temperature air inside and fertilizer particles outside, because of the temperature difference between the heat exchange fins and the fertilizer particles, the second law of thermodynamics is followed, namely heat can be spontaneously transferred from an object with high temperature to a cooler object but cannot be spontaneously transferred from an object with low temperature to an object with high temperature, and the fertilizer particles can be reduced to the required temperature by calculating the heat exchange area and the cooling air volume. The cooling device is provided with a temperature sensor 21b for detecting the temperature of the cooled fertilizer particles and is interlocked with an electric regulating valve 23b for regulating the cooling air volume, when the temperature of the cooled fertilizer particles is high, the electric regulating valve 23b increases the cooling air volume, and when the temperature of the cooled fertilizer particles is smaller than a set threshold value, the electric regulating valve 23b reduces the cooling air, so that the fertilizer particles cannot absorb moisture due to too low temperature to cause the rise of water content, and the accurate control of the temperature of the fertilizer particles is realized.
Example 3
As shown in fig. 5, the main technical solution of this embodiment is substantially the same as that of embodiment 1 or embodiment 2, and the features that are not explained in this embodiment adopt the explanations in embodiment 1 or embodiment 2, which are not described herein again. This embodiment differs from embodiment 1 or embodiment 2 in that: the air distribution hole 141b is a bubble cap hole formed by communicating a side opening with the interior of the cavity.
Example 4
As shown in fig. 6, the main technical solution of this embodiment is substantially the same as that of embodiment 1, embodiment 2, or embodiment 3, and the features that are not explained in this embodiment adopt the explanations in embodiment 1, embodiment 2, or embodiment 3, and are not described again here. This example differs from example 1, example 2 or example 3 in that: the air distribution hole 141b is a bubble cap hole with a plurality of tooth gaps on the wall surface.
Example 5
As shown in fig. 7, the main technical solution of this embodiment is substantially the same as that of embodiment 1, embodiment 2, embodiment 3, or embodiment 4, and the features that are not explained in this embodiment adopt the explanations in embodiment 1, embodiment 2, embodiment 3, or embodiment 4, and are not described again here. This example differs from example 1, example 2, example 3 or example 4 in that: the air distribution holes 141b are tapered holes which are gradually reduced from inside to outside.
Example 6
As shown in fig. 8, a main technical solution of this embodiment is substantially the same as that of embodiment 1, embodiment 2, embodiment 3, embodiment 4, or embodiment 5, and features not explained in this embodiment adopt the explanations in embodiment 1, embodiment 2, embodiment 3, embodiment 4, or embodiment 5, and are not described again here. This example differs from example 1, example 2, example 3, example 4 or example 5 in that: the air distribution hole 141b is a stacked hole formed by overlapping two holes with a large inside and a small outside.
Example 7
As shown in fig. 9, a main technical solution of this embodiment is substantially the same as that of embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, or embodiment 6, and features not explained in this embodiment adopt the explanations in embodiment 1, embodiment 2, embodiment 3, embodiment 4, or embodiment 5, and are not described again here. This example differs from example 1, example 2, example 3, example 4, example 5 or example 6 in that: the air distribution holes 141b are micropores formed on the micropore gasification plate.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the scope of protection is not limited to the specific embodiments disclosed and described above, and some modifications and variations to the claims should fall within the scope of the invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A low tower granulation system based on an improved tower bottom material receiving mechanism is used for manufacturing fertilizer particles and comprises a pulping system, an atomizing granulation disc, a granulation tower and a material receiving mechanism; the pulping system heats the fertilizer raw material melt, conveys the melt to an atomizing granulation disc in a tower body of a granulation tower, the atomizing granulation disc rotates at a high speed under the drive of a motor, centrifugally throws out the melt at a high speed for atomization, and the melt atomized liquid drops thrown out centrifugally are cooled and solidified into fertilizer particles through free falling bodies in the tower body and fall into a material receiving mechanism at the bottom of the tower for collection; the method is characterized in that:
the material receiving mechanism arranged at the bottom of the granulation tower comprises a fan, a dehumidification module and an air distribution box which are sequentially connected;
the air distribution box is of a funnel-shaped structure, the upper end of the air distribution box is correspondingly arranged at the bottom of the granulation tower and is used for collecting fertilizer particles falling in the granulation tower; the funnel-shaped inner wall of the air distribution box is provided with a plurality of air distribution holes, the outer wall of the air distribution box is provided with an air inlet hole, and a cavity communicated with the air distribution holes and the air inlet hole is arranged between the inner wall and the outer wall;
after the fan passes through the dehumidification module, the air is blown into the cavity through the air inlet holes and is blown out from the air distribution holes; fertilizer particles falling to the inner wall of the air distribution box are in a fluidized state under the air blowing state of the air distribution holes; the lower end of the air distribution box is also provided with a material receiving port for collecting fertilizer particles flowing down on the air distribution box.
2. The low tower granulation system based on the improved tower bottom material receiving mechanism is characterized in that a cooling device is arranged at the lower end of the interior of the tower body, the cooling device is a water-cooling device, and the water-cooling device comprises a water cooling tower, a water pump, an electric regulating valve and a plurality of heat exchange sheets; the water cooling tower, the water pump and the electric regulating valve are arranged outside the tower body and are sequentially connected; the plurality of heat exchange fins are vertically arranged at the lower end in the tower body, two ends of each heat exchange fin are respectively connected with a water inlet main pipe and a water outlet main pipe, and the water inlet main pipe and the water outlet main pipe are respectively connected with the electric regulating valve and the water cooling tower; the utility model discloses a fertilizer drying tower, including tower body, heat exchanger fin, temperature sensor, electric control valve, temperature sensor, electric control valve, temperature value that the tower body lateral wall is last to correspond the bottom position of heat exchanger fin is equipped with temperature sensor for detect the temperature of fertilizer granule after the cooling, temperature sensor with electric control valve interlocking is connected, electric control valve basis the.
3. The tower bottom receiving mechanism-based low tower granulation system based on the improvement of the tower bottom receiving mechanism as claimed in claim 1, wherein a cooling device is arranged at the lower end inside the tower body, the cooling device is an air cooling device, and the air cooling device comprises an electric regulating valve, an induced draft fan and heat exchange fins; the electric regulating valve and the induced draft fan are arranged outside the tower body, and the electric regulating valve is connected with an inlet of the induced draft fan; the plurality of heat exchange fins are vertically arranged at the lower end in the tower body, two ends of each heat exchange fin are respectively connected with the air inlet main pipe and the air outlet main pipe, and the air inlet main pipe penetrates through the side wall of the tower body and is communicated with the outside; the electric regulating valve is connected between the air outlet main pipe and the induced draft fan; the utility model discloses a fertilizer drying tower, including tower body, heat exchanger fin, temperature sensor, electric control valve, temperature sensor, electric control valve, temperature value that the tower body lateral wall is last to correspond the bottom position of heat exchanger fin is equipped with temperature sensor for detect the temperature of fertilizer granule after the cooling, temperature sensor with electric control valve interlocking is connected, electric control valve basis the.
4. The tower bottom receiving mechanism-based low tower granulation system as claimed in claim 2 or 3, wherein the lower end inside the tower body is provided with a plurality of baffle plates which are uniformly arranged downwards, the included angle between each baffle plate and the horizontal direction is 45-90 degrees, and each baffle plate is a detachable steel plate and is positioned above a plurality of heat exchange plates.
5. The tower bottom material collecting mechanism improved based low tower granulation system as claimed in claim 1, wherein the air distribution box is made of stainless steel, and the inner wall of the air distribution box is inclined and forms an angle of 5-45 ° with the horizontal direction.
6. The tower bottom material receiving mechanism improved low tower granulation system as claimed in claim 5, wherein a plurality of said wind distribution holes are uniformly arranged along a direction perpendicular to the inner wall of said wind distribution box and penetrate through the inner wall of said wind distribution box; the aperture of the air distribution hole is smaller than that of the air inlet hole; the aperture of the air distribution hole is 1mm-5 mm; the distance between two adjacent air distribution holes is 50-250 mm.
7. The tower bottom receiving mechanism based on the improvement of the tower bottom receiving mechanism as claimed in claim 5, wherein the air distribution hole is a bubble cap hole, a straight hole, a taper hole, a stacked hole formed by stacking two holes with a large inner part and a small outer part, or a micropore on a micropore gasification plate.
8. The tower bottom receiving mechanism based on the improvement of the low tower granulation system as claimed in claim 1, wherein the receiving opening is a conical hopper structure with a large upper part and a small lower part, and is used for collecting fertilizer particles flowing down on the air distributing box and uniformly conveying the fertilizer particles downwards to a belt conveyor below the air distributing box; the material receiving port lower extreme is equipped with the aperture governing valve for adjust the size of the load of fertilizer granule.
9. The tower bottom material receiving mechanism improved low tower granulation system as claimed in claim 8, wherein a material level sensor is provided at the lower end of the outer wall of the tower body, and the detection end of the material level sensor extends into the tower body for detecting the material level of fertilizer particles; the opening adjusting valve is connected with the material level sensor in an interlocking mode, and the opening adjusting valve adjusts the discharge amount of fertilizer particles according to the material level detected by the material level sensor.
10. The tower bottom receiving mechanism based on the improvement of the low tower granulation system as claimed in claim 1, wherein the fertilizer granules have a diameter of 0.5-2.5 mm.
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| CN202110297865.9A CN113058502A (en) | 2021-03-19 | 2021-03-19 | Low tower granulation system based on improve material receiving mechanism at bottom of tower |
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