CN110433635A - A kind of high-efficiency desulfurization eliminating white smoke device and technique - Google Patents
A kind of high-efficiency desulfurization eliminating white smoke device and technique Download PDFInfo
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- CN110433635A CN110433635A CN201910605863.4A CN201910605863A CN110433635A CN 110433635 A CN110433635 A CN 110433635A CN 201910605863 A CN201910605863 A CN 201910605863A CN 110433635 A CN110433635 A CN 110433635A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 130
- 230000023556 desulfurization Effects 0.000 title claims abstract description 127
- 239000000779 smoke Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003546 flue gas Substances 0.000 claims abstract description 101
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 99
- 238000001816 cooling Methods 0.000 claims abstract description 83
- 239000007788 liquid Substances 0.000 claims abstract description 60
- 239000007921 spray Substances 0.000 claims abstract description 57
- 239000002002 slurry Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000007789 gas Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000005864 Sulphur Substances 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 21
- 238000012546 transfer Methods 0.000 abstract description 13
- 235000019504 cigarettes Nutrition 0.000 description 9
- 230000003009 desulfurizing effect Effects 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000003517 fume Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000005619 thermoelectricity Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- PZZOEXPDTYIBPI-UHFFFAOYSA-N 2-[[2-(4-hydroxyphenyl)ethylamino]methyl]-3,4-dihydro-2H-naphthalen-1-one Chemical compound C1=CC(O)=CC=C1CCNCC1C(=O)C2=CC=CC=C2CC1 PZZOEXPDTYIBPI-UHFFFAOYSA-N 0.000 description 1
- 241000521257 Hydrops Species 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009692 water atomization Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of high-efficiency desulfurization eliminating white smoke device and techniques, the desulfurization eliminating white smoke device includes desulfurization temperature-reducing tower and the outer cooling device of tower, the side of desulfurization temperature-reducing tower connects inlet flue duct, top connection outlet flue, bottom is equipped with interior tower reactor, desulfurization be located in cooling tower be successively arranged above smoke inlet from the bottom to top by several set of heat exchange tubes at high-efficiency desulfurization cooling integrated device, atomizing spray layer and demister；High-efficiency desulfurization cooling integrated device connect to form circulation with the outer cooling device of tower；Atomizing spray layer is connect with interior tower reactor；Heat collector and cooler are successively arranged along flue gas flow direction in inlet flue duct；Reheater is equipped in exhaust pass, reheater connect to form circulation with cooler.The present invention reduces flue gas volume by cooling, increases desulfurization residence time in cooling tower, cools down integrated device not against slurries evaporative cooling by high-efficiency desulfurization, enhances gas-liquid mass transfer effect, realize high-efficiency desulfurization eliminating white smoke, flue gas salt content is effectively reduced.
Description
Technical field
The present invention relates to fire coal boiler fume Treatment process fields, and in particular to a kind of high-efficiency desulfurization eliminating white smoke device and work
Skill.
Background technique
Contain a large amount of sulfur dioxide and fine particle, Qian Zhezao in the flue gas that coal-fired boiler combustion fossil fuel generates
At acid rain phenomenon, the latter can form Aerosol Pollution in chimney exhaust, cause haze phenomenon, seriously endanger human survival ring
Border.For increasingly serious atmosphere pollution situation, government has put into effect the discharge standard being increasingly stringenter.With the ultralow row of thermoelectricity
Popularization is put, non-electrical industry also faces ultralow transformation, however the smoke condition of non-electrical industry is more more complicated than thermoelectricity, therefore develops newly
Technology is extremely urgent.Also there is minimum discharge standard successively in non-electrical industry, and wherein most is referring to thermoelectricity standard, SO in flue gas2
≤35mg/Nm3, NOx≤50mg/Nm3, dust≤5mg/Nm3.Moreover, increasingly severe haze phenomenon directs at white cigarette phenomenon,
Therefore relevant regulations are also being put into effect in many places, to eliminate white cigarette phenomenon, reduce visual pollution, eliminate haze.
Wet desulphurization at this stage accounts for 90% or more of the flue gas desulfurization device for having operation, imitates for minimum discharge desulfurization
Rate generally will be to 98% or more, will be to 99% or more using the smoke desulfurization efficiency of sulphur coal.Desulfurization fume is handled at this stage
The technology of white cigarette is generally used the method and flue gas condensing thermal method again of flue gas reheat.The method of flue gas reheat is by flue gas
It is discharged after to certain temperature, first is that the rising height of flue gas is improved, second is that solving the problems, such as flue gas saturated humidity.But flue gas
Humidity is still very high, still will appear white cigarette problem under certain conditions.Flue gas condensing thermal method again, then be on the basis of reheating
On with medium go cooling flue gas, be after all use air as cold source, first is that cooling temperature will not be too low, second is that between gas-liquid
It is bad (if directly contact, has Pollution Cycle water and have situations such as corrosion and scaling adjoint) to connect heat-transfer effect.And such side
Method increases energy consumption to a certain extent, and or cost of investment is higher or operating cost is higher, but also along with it
His problem.
In view of the above-mentioned problems, application No. is 201710451922.8 patent documents to disclose a kind of desulfurization fume ultra-clean
The device and method of dedusting eliminating white smoke, including wet desulphurization tower, cooling tower and circulating water chennel, the structure of desulfurizing tower are that lower part is slurry
Liquid pool, primary gas inlet upwards, atomizing spray floor, mist separator of desulfurization, blast cap, chilling spray area, dedusting demister and de-
The outlet of sulphur tower.For this form in chilling spray area due to being atomization cold water cooling, lower end collection cooling water atomizing particle is larger, therefore
Cooling zone is caused to need biggish water that could sufficiently cool down in bigger space, and quantity of circulating water is larger will lead to cooling
Energy consumption it is higher, and particle solution precipitates at hydrops, causes to block.
In view of the above-mentioned problems, application No. is 201811171922.3 patent documents to disclose a kind of inexpensive flue gas depth
Water eliminating white smoke technique is received in purification device and its purification, and purification device includes desulfurizing tower, and it is single that desulfurization spray is successively arranged in desulfurizing tower
Member, cooling condenser, demisting are dehydrated layer, first outlet heat exchanger, second outlet heat exchanger, enter cigarette channel and are connected with and change into flue
Hot device, desulfurizing tower are externally provided with heat exchange liquid surge tank, heat exchange liquid circulating pump, circulation fluid cooling tower, coolant recirculation pump.To flue gas into
Row cooling, condensation, coalescence, moisture realizes multi-pollutant deep purifying simultaneously in recovered flue gas.But mainly pass through desulfurization
Evaporative cooling increases aqueous vapor, then collects aqueous vapor in condensation cooling again, systematic procedure and quantity is increased, to increase and be
System resistance.In addition demisting dehydration layer is easy fouling blockage in above-mentioned patent, and due to heating wet flue gas, salt is analyzed easy in flue gas
Scale effect heat exchanger effect long-play blocking easy to form on heat exchangers.
Summary of the invention
For shortcoming existing for this field, the present invention provides a kind of high-efficiency desulfurization eliminating white smoke device, using efficient
Desulfurization cooling integrated device, contacts flue gas uniformly with spray liquid, increases gas liquid interfacial area, enhances gas-liquid mass transfer effect, real
Existing desulfurization synergistic.Meanwhile heat collector and cooler reduce flue-gas temperature and efficiently use waste heat, are then dropped using high-efficiency desulfurization
Warm integrated device realizes flue gas heat exchange cooling but does not increase flue gas vapor content and salt content, heats cigarette finally by reheater
Gas, to achieve the purpose that eliminating white smoke.
A kind of high-efficiency desulfurization eliminating white smoke device, including cooling device outside desulfurization temperature-reducing tower and tower, the desulfurization temperature-reducing tower
Side connects inlet flue duct, top connection outlet flue, and bottom is equipped with interior tower reactor, and the desulfurization is located at smoke inlet in cooling tower
Top be successively arranged from the bottom to top by several set of heat exchange tubes at high-efficiency desulfurization cooling integrated device, atomizing spray layer and demisting
Device；
The high-efficiency desulfurization cooling integrated device connect to form circulation by cooling water circulating pump with the outer cooling device of tower；
The atomizing spray layer is connect by desulfurization slurry circulating pump with interior tower reactor；
Heat collector and cooler are successively arranged along flue gas flow direction in the inlet flue duct；
Reheater is equipped in the exhaust pass, reheater connect to form circulation with the cooler.
After flue gas in medium and inlet flue duct in cooler carries out heat exchange heating, it is delivered to reheater heating exit
Flue gas in flue, is then back in cooler again, so recycles.
Flue gas successively passes through heat collector and cooler first in inlet flue duct, and completion cools down twice, subsequently into desulfurization
Desulfurization, dedusting in cooling tower are finally entered in exhaust pass and are discharged after reheated device heating.The desulfurization takes off in cooling tower
In sulphur, dust removal process, the spray liquid of flue gas and atomizing spray layer exchanges heat on high-efficiency desulfurization cooling integrated device, reduces cigarette
Gas and spray liquid degree, whole process by evaporation slurries cooling, do not improve salinity in flue gas not only and are washed in reduction flue gas instead
Salinity.
Preferably, the heat transferring medium in the heat collector is boiler feed water.The heat that the heat collector obtains also can be used
Water is used in what other needs heated, realizes UTILIZATION OF VESIDUAL HEAT IN, energy-saving and emission-reduction.
Preferably, the heat collector and cooler can be a heat exchanger, heat transferring medium is boiler feed water or use
In the heat medium water of heating exit flue gas, or even for heating other demands.
The cold liquid of circulation cycle in the heat exchanger tube recycles cold liquid and flue gas, after the spray liquid of atomizing spray layer is exchanged heat
Heating is delivered to the outer cooling device of tower and is cooled down, is then refluxed for heat exchanger tube, so recycles.
Preferably, the heat exchanger tube is horizontally disposed, parallel to each other, changing for several layers interlaced arrangement is formed in the longitudinal direction
Heat pipe layer is conducive to the uniformity for improving flue gas and spray liquid distribution, is conducive to exchange heat.
Can by adjusting between adjacent heat exchange tube layer interlamellar spacing, it is same heat exchange tube layer in adjacent heat exchange tubes between away from
It is distributed from come the uniformity and spray liquid that adjust flue gas, contacts flue gas uniformly with spray liquid, increase gas liquid interfacial area, increase
Strong gas-liquid mass transfer effect, increase desulfurization effect, and adapts to the requirement under boiler different load difference operating condition with this.High-efficiency desulfurization
Cooling integrated device contacts simultaneously with flue gas, spray liquid, and spray liquid forms liquid film on heat exchanger tube periphery and realizes liquid-liquid heat exchange, pole
Big enhancing heat transfer effect, realizes that spray liquid temperature reduces, and spray liquid directly uniformly mixes fast cooling (directly cooling with flue gas again
Most effective cooling method), thus can reduce high-efficiency desulfurization cooling integrated device volume, reduce space requirement and manufacture at
This.Moreover, spray liquid washing away for heat pipe of exchange effectively prevents heat exchanger tube fouling blockage.
Preferably, the number of plies of the heat exchange tube layer is 2~5 layers.
Preferably, the interlamellar spacing between adjacent heat exchange tube layer is 0~500mm；
The distance between adjacent heat exchange tubes in same heat exchange tube layer are 0~500mm.
The heat exchanger tube can be round tube, rhumbatron or semi-circular tube.Preferably, it is 10 that the heat exchanger tube, which is outer diameter,
~200mm, the round tube that wall thickness is 0.1~20mm, are conducive to the progress of heat exchange.
Preferably, high-efficiency desulfurization cooling the distance between integrated device top and atomizing spray layer bottom end for 0~
3000mm is conducive to the uniformity for improving flue gas and spray liquid distribution, is conducive to the progress of heat exchange.
The present invention also provides a kind of desulfurization eliminating white smoke techniques, use the desulfurization eliminating white smoke device, comprising: flue gas is first
First in inlet flue duct successively pass through heat collector and cooler, completion cool down twice, subsequently into desulfurization in cooling tower desulfurization, remove
Dirt is finally entered in exhaust pass and is discharged after reheated device heating；
The desulfurization in cooling tower desulfurization, in dust removal process, the spray liquid of flue gas and atomizing spray layer is in high-efficiency desulfurization
It exchanges heat on cooling integrated device, reduces flue gas and spray liquid temperature.
Preferably, flue gas is after heat collector, flue-gas temperature maintains 0~5 DEG C of acid dew point or more, subsequent cold in this way
But device will not face etching problem, can select more low material, save the cost.
Preferably, flue gas is cooled to 50~70 DEG C after subcooler.Desulfurizing tower outlet temperature in this way does not exceed 45
DEG C, can reduce high-efficiency desulfurization cooling integrated device cooling demand, reduce high-efficiency desulfurization cooling integrated device volume and at
This.
Preferably, the temperature of the cold liquid of circulation in the high-efficiency desulfurization cooling integrated device is 0~40 DEG C, cold liquid is recycled
Liquid-gas ratio with flue gas is 3~20L/Nm3, heat transfer effect is preferable.
Preferably, flue gas by high-efficiency desulfurization cool down integrated device after, cool down 0~30 DEG C, be cooled to 42 DEG C or less or
Water capacity is not more than 8%.Being kept substantially water capacity in flue gas in this way not will increase, and realize the water capacity and drop of dry desulfurization
Low soluble-salt.
The present invention directly substantially cools down and recovery section waste heat in flue, is then cooled down integrated device using high-efficiency desulfurization
Cooling down, the not evaporation of aqueous vapor in the process realizes the desulfurization effect of wet desulphurization and reaches the vapor content of dry desulfurization, and
And in the presence of the heat exchange with spray liquid in high-efficiency desulfurization cooling integrated device temperature-fall period, heat transfer efficiency is high and in the flushing of spray liquid
Under will not influence heat-transfer effect because of fouling.
The heat that the simple flue gas cool-down of the condensation phase no-load voltage ratio of aqueous vapor needs in flue gas is much bigger, therefore the present invention uses merely
Heat exchange cooling makes greatly to reduce in the cool down in cooling tower heat of needs of desulfurization, then simultaneously using heat exchanger tube and flue gas, spray liquid
Contact heat-exchanging, the contact area of expansion and flue gas, enhancing heat transfer effect, small in size compared with the heat exchanger of simple flue gas heat exchange,
It is low to reduce space requirement, and greatly reduces heat exchanger cost and energy consumption and system resistance.
Compared with prior art, the present invention major advantage includes:
(1) present invention realizes desulfurization minimum discharge and one body technique of eliminating white smoke.
(2) present invention can satisfy different coals quality and the biggish boiler controller system of load variations.
(3) present invention is using gas approach heat exchange cooling, greatly diminution flue gas volume, and improving desulfurization, flue gas stops in cooling tower
The time is stayed, desulfuration efficiency is improved and reduces system operation energy consumption.
(4) heat collector heating boiler water is carried out waste heat and is recycled, reaches energy-saving effect.
(5) high-efficiency desulfurization cooling integrated device is below desulfurization temperature-reducing tower entrance top and atomizing spray layer, with flue gas, spray
Liquid heat exchange is drenched, the fouling blockage that can prevent high-efficiency desulfurization from cooling down integrated device is washed away due to spray liquid, can be improved efficiently
The service life of desulfurization cooling integrated device, and reduce flue gas purification system resistance.
(6) flue-gas temperature is reduced using heat exchange, flue gas salt content is effectively reduced not against slurries evaporative cooling.
(7) spray liquid forms liquid film in high-efficiency desulfurization cooling integrated device and realizes liquid-liquid heat exchange, passes than liquid-gas heat exchanger
Thermal effect is more preferable, greatly reduction device volume, reduces cost and system resistance.
(8) present invention is by entrance cooling high-temperature fume, and will absorb heat and heat up heat source as condensed flue gas,
And waste heat, which is realized, to be recycled, and flue gas disappears white process without external heat source, realizes flue gas low cost eliminating white smoke.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the desulfurization eliminating white smoke device of embodiment；
In figure: 1- flue gas, 2- heat collector, 3- cooler, 4- desulfurization temperature-reducing tower, 5- high-efficiency desulfurization cooling integrated device, 6-
Desulfurization atomizing spray layer, 7- high efficiency demister layer, 8- reheater, 9- cooling device, 10- tower reactor.
Specific embodiment
With reference to the accompanying drawing and specific embodiment, the present invention is further explained.It should be understood that these embodiments are merely to illustrate
The present invention rather than limit the scope of the invention.The operating method of actual conditions is not specified in the following example, usually according to
Normal condition, or according to the normal condition proposed by manufacturer.
As shown in Figure 1, the desulfurization eliminating white smoke device of the present embodiment, the cooling dress including desulfurization temperature-reducing tower 4 and outside tower
Set 9, the side of desulfurization temperature-reducing tower 4 connects inlet flue duct, top connection outlet flue, sets tower reactor 10, desulfurization temperature-reducing tower 4 in bottom
It is interior be successively arranged above the smoke inlet from the bottom to top by several set of heat exchange tubes at high-efficiency desulfurization cooling integrated device 5,
Desulfurization atomizing spray layer 6 and high efficiency demister layer 7.
High-efficiency desulfurization cooling integrated device 5 connect to form closed circulation by cooling water circulating pump with cooling device 9.
The cold liquid of circulation cycle in heat exchanger tube recycles cold liquid and flue gas, after the spray liquid of desulfurization atomizing spray layer 6 is exchanged heat
Heating, is delivered to cooling device 9 through cooling water circulating pump and is cooled down, is then refluxed for heat exchanger tube, so recycles.
Heat exchanger tube is horizontally disposed, parallel to each other, forms the heat exchange tube layer of 2~5 layers of interlaced arrangement in the longitudinal direction, is conducive to mention
The uniformity and spray liquid of high flue gas are distributed, and are conducive to exchange heat.
Can by adjusting between adjacent heat exchange tube layer interlamellar spacing, it is same heat exchange tube layer in adjacent heat exchange tubes between away from
It is distributed from come the uniformity and spray liquid that adjust flue gas, contacts flue gas uniformly with spray liquid, increase gas liquid interfacial area, increase
Strong gas-liquid mass transfer effect, increase desulfurization effect, and adapts to the requirement under boiler different load difference operating condition with this.High-efficiency desulfurization
Contact heat-exchanging, enhancing heat transfer effect can reduce high-efficiency desulfurization cooling integrally simultaneously for cooling integrated device 5 and flue gas, spray liquid
The volume of device 5 reduces space requirement and cost.
Interlamellar spacing between adjacent heat exchange tube layer is 0~500mm.
The distance between adjacent heat exchange tubes in same heat exchange tube layer are 0~500mm.
Heat exchanger tube is the round tube that outer diameter is 10~200mm, wall thickness is 0.1~20mm, is conducive to the progress of heat exchange.
High-efficiency desulfurization cooling the distance between 5 top of integrated device and 6 bottom end of desulfurization atomizing spray layer are 0~3000mm,
The uniformity and spray liquid distribution for being conducive to improve flue gas, are conducive to the progress of heat exchange.
Desulfurization atomizing spray layer 6 is connect by desulfurization slurry circulating pump with tower reactor 10.
Heat collector 2 and cooler 3 are successively arranged along flue gas flow direction in inlet flue duct.
Reheater 8 is equipped in exhaust pass, reheater 8 connect to form closed circulation with cooler 3.
After flue gas in medium and inlet flue duct in cooler 3 carries out heat exchange heating, it is delivered to reheater 8 and heats out
Flue gas in mouth flue, is then back in cooler 3 again, so recycles.
Heat transferring medium in heat collector 2 is boiler feed water.The heat that heat collector 2 obtains can also be used for what other needs heated
With water, UTILIZATION OF VESIDUAL HEAT IN, energy-saving and emission-reduction are realized.
Use the desulfurization eliminating white smoke technique of above-mentioned desulfurization eliminating white smoke device, comprising: flue gas first in inlet flue duct successively
By heat collector 2 and cooler 3, completion cools down twice, subsequently into desulfurization, dedusting in desulfurization temperature-reducing tower 4, finally enters outlet
Reheated device 8 discharges after heating in flue；
Desulfurization in desulfurization temperature-reducing tower 4, in dust removal process, the spray liquid of flue gas and desulfurization atomizing spray layer 6 is in high-efficiency desulfurization
It exchanges heat on cooling integrated device 5, reduces flue gas and spray liquid temperature.
For flue gas after heat collector 2, flue-gas temperature maintains 0~5 DEG C of acid dew point or more, and cooler 3 subsequent in this way is not
Etching problem can be faced, more low material, save the cost can be selected.
Flue gas is cooled to 50~70 DEG C after subcooler 3.4 outlet temperature of desulfurization temperature-reducing tower in this way does not exceed 45 DEG C,
Can reduce high-efficiency desulfurization cooling integrated device 5 cooling demand, reduce high-efficiency desulfurization cooling integrated device 5 volume and at
This.
The temperature of the cold liquid of circulation in high-efficiency desulfurization cooling integrated device 5 is 0~40 DEG C, recycles the liquid gas of cold liquid and flue gas
Than for 3~20L/Nm3, heat transfer effect is preferable.
Flue gas cools down by high-efficiency desulfurization after integrated device 5, cools down 0~30 DEG C, is cooled to 42 DEG C or less or water capacity not
Greater than 8%.Being kept substantially water capacity in flue gas in this way not will increase, and realizes the water capacity of dry desulfurization and reduces soluble
Salt.
In above-mentioned desulfurization eliminating white smoke technique, first after substantially cooling down, volume greatly reduces flue gas, in desulfurization temperature-reducing tower 4
It will be significantly greatly increased when interior stop, and contact flue gas uniformly with spray liquid using high-efficiency desulfurization cooling integrated device 5, increase gas-liquid
Contact area enhances gas-liquid mass transfer effect, to realize high-efficiency desulfurization, and system resistance is effectively reduced.Moreover, temperature-fall period
Middle realization heat exchange reduces flue-gas temperature and does not increase humidity of flue gas, has saved a large amount of evaporation water, it might even be possible to further condensation
In former flue gas water and collect his use.
Application examples 1
In certain paper mill, 1 130 tons of boiler creates device and technique that desulfurization project uses embodiment, and exhaust gas volumn is
130100Nm3/ h, SO in inlet flue gas2Concentration is 2758mg/Nm3, 125 DEG C of flue-gas temperature, dust concentration is in inlet flue gas
58mg/Nm3, atomizing spray layer is 3 layers, liquid-gas ratio 21L/Nm3.85 DEG C are reduced to by heat collector flue-gas temperature, through subcooler
70 DEG C are reduced to, SO2Exit concentration 20mg/Nm3, desulfuration efficiency 99.27%, outlet dust concentration is 2.7mg/Nm3, aerosol is dense
Spend 0.23mg/Nm3, 39.8 DEG C of reheater import smoke temperature, 55 DEG C of outlet temperature, no white cigarette phenomenon.
Application examples 2
In certain steam power plant, 2 220 tons of boilers, desulfurizing fly ash engineering uses the device and technique of embodiment, and exhaust gas volumn is
701240Nm3/ h, SO in inlet flue gas2Concentration is 2847mg/Nm3, 130 DEG C of flue-gas temperature, dust concentration is in inlet flue gas
53mg/Nm3, atomizing spray layer is 3 layers, and interior circulation liquid-gas ratio is 21L/Nm3.SO before being transformed2Exit concentration 100mg/Nm3, desulfurization
Efficiency 94.6%, outlet dust concentration are 18mg/Nm3, aerosol concentration 7.2mg/Nm3.After transformation, by heat exchanger flue gas temperature
Degree is reduced to 80 DEG C, is reduced to 66 DEG C through subcooler, SO2Exit concentration 15mg/Nm3, desulfuration efficiency 99.47%, outlet dust concentration
For 2.3mg/Nm3, aerosol concentration 0.13mg/Nm3, 38.7 DEG C of reheater import smoke temperature, 52 DEG C of outlet temperature, no white cigarette phenomenon.
In addition, it should also be understood that, those skilled in the art can be to this hair after having read foregoing description content of the invention
Bright to make various changes or modifications, these equivalent forms also fall within the scope of the appended claims of the present application.
Claims (10)
1. a kind of high-efficiency desulfurization eliminating white smoke device, including cooling device outside desulfurization temperature-reducing tower and tower, the side of the desulfurization temperature-reducing tower
Face connects inlet flue duct, top connection outlet flue, and bottom is equipped with interior tower reactor, which is characterized in that desulfurization position in cooling tower
Be successively arranged from the bottom to top above smoke inlet by several set of heat exchange tubes at high-efficiency desulfurization cooling integrated device, atomization spray
Drenching layer and demister；
The high-efficiency desulfurization cooling integrated device connect to form circulation by cooling water circulating pump with the outer cooling device of tower；
The atomizing spray layer is connect by desulfurization slurry circulating pump with interior tower reactor；
Heat collector and cooler are successively arranged along flue gas flow direction in the inlet flue duct；
Reheater is equipped in the exhaust pass, reheater connect to form circulation with the cooler.
2. desulfurization eliminating white smoke device according to claim 1, which is characterized in that the heat transferring medium in the heat collector is pot
Furnace water.
3. desulfurization eliminating white smoke device according to claim 1, which is characterized in that the heat exchanger tube is horizontally disposed, mutual
In parallel, the heat exchange tube layer of several layers interlaced arrangement is formed in the longitudinal direction.
4. desulfurization eliminating white smoke device according to claim 3, which is characterized in that the interlamellar spacing between adjacent heat exchange tube layer is
0~500mm；
The distance between adjacent heat exchange tubes in same heat exchange tube layer are 0~500mm.
5. desulfurization eliminating white smoke device according to claim 1, which is characterized in that the heat exchanger tube be outer diameter be 10~
200mm, the round tube that wall thickness is 0.1~20mm.
6. desulfurization eliminating white smoke device according to claim 1, which is characterized in that high-efficiency desulfurization cooling integrated device top
The distance between end and atomizing spray layer bottom end are 0~3000mm.
7. a kind of high-efficiency desulfurization eliminating white smoke technique, which is characterized in that taken off using described in claim 1~6 any claim
Sulphur eliminating white smoke device, comprising: flue gas successively passes through heat collector and cooler first in inlet flue duct, and completion cools down twice, so
Enter desulfurization desulfurization, dedusting in cooling tower afterwards, finally enters in exhaust pass and discharged after reheated device heating；
The desulfurization in cooling tower desulfurization, in dust removal process, the spray liquid of flue gas and atomizing spray layer cools down in high-efficiency desulfurization
It exchanges heat on integrated device, reduces flue gas and spray liquid temperature.
8. desulfurization eliminating white smoke technique according to claim 7, which is characterized in that flue gas is after heat collector, flue-gas temperature
Maintain 0~5 DEG C of acid dew point or more；
Flue gas is cooled to 50~70 DEG C after subcooler.
9. desulfurization eliminating white smoke technique according to claim 7, which is characterized in that in the high-efficiency desulfurization cooling integrated device
The temperature of the cold liquid of circulation be 0~40 DEG C, the liquid-gas ratio for recycling cold liquid and flue gas is 3~20L/Nm3。
10. the desulfurization eliminating white smoke technique according to claim 7 or 9, which is characterized in that flue gas is by high-efficiency desulfurization cooling one
After body device, it is cooled to 42 DEG C or less or water capacity is not more than 8%.
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