CN116036754A - Ceramic fiber filter tube and production process thereof - Google Patents

Abstract

The application relates to the technical field of high-temperature flue gas purification, and specifically discloses a ceramic fiber filter tube and a production process thereof. A ceramic fiber filter tube includes a cylindrical support body, one end of the support body is closed, the unclosed end of the support body is coaxially fixedly connected with an installation ring, the inner wall of the support is provided with a denitrification layer, and the outer wall of the support is A dust removal layer is provided, and the side of the dust removal layer facing away from the support body is provided with a winding layer for protecting the dust removal layer; the production process is: first mix the raw materials of the sintered body, and sinter at 1250°C to form a support with a mounting ring body, then sinter the denitrification layer on the inner wall of the support, sinter the dust removal layer on the inner wall of the support, and finally install the winding layer on the outer wall of the support to protect the dust removal layer. The ceramic fiber filter tube of the present application can be used for high-temperature flue gas purification, and has the advantage of stable coating and not easy to fall off; in addition, the preparation method of the present application has the advantage of simple preparation method.

Description

A ceramic fiber filter tube and its production process

technical field

This application relates to the technical field of high-temperature flue gas purification, and more specifically, it relates to a ceramic fiber filter tube and its production process.

Background technique

Under the environment of increasingly stringent environmental protection regulations, the treatment of high-temperature flue gas has become a serious issue of concern to enterprises. The traditional cooling and dust removal process usually loses valuable heat energy, while the ceramic fiber filter tube can directly filter high-temperature gas, eliminating the cooling process, reducing heat waste, simplifying the process and reducing equipment investment.

The ceramic fiber filter tube uses ceramic fiber composite material as the support body, and the coating is loaded on the support body, so that the ceramic fiber filter tube has functions such as flue gas denitrification.

Because ceramic fiber filter tubes are generally used in the purification of high-temperature flue gas at 500-800°C, due to the influence of long-term high-temperature environment, the coating is easy to fall off from the support under the action of air flow erosion, resulting in poor flue gas treatment effect.

Contents of the invention

In order to improve the connection stability of the coating on the support body and reduce the falling off of the coating under the influence of high temperature, the application provides a ceramic fiber filter tube and its production process.

In the first aspect, the present application provides a ceramic fiber filter tube, which adopts the following technical scheme:

A ceramic fiber filter tube, comprising a cylindrical support body, one end of the support body is closed, the unclosed end of the support body is coaxially fixedly connected with a mounting ring, the inner wall of the support body is provided with a denitrification layer, and the support body The outer wall is provided with a dust removal layer, and the side of the dust removal layer facing away from the support body is provided with a winding layer for protecting the dust removal layer;

The support body is prepared from the following raw materials in parts by weight: 240-300 parts of aluminum silicate fiber, 2-4 parts of inorganic binder, 2-4 parts of organic binder, 3-5 parts of pore-forming agent, 3-7 parts of ethanolamine aqueous solution, 1-3 parts of lubricant;

The denitration layer is obtained by sintering the denitration catalytic slurry adhered to the inner wall of the support, and the denitrification catalytic slurry includes the following raw materials in parts by weight: 10-20 parts of aluminum silicate fiber, 5-15 parts of denitration catalyst fiber, 500-600 parts of titanium dioxide, 1-5 parts of ammonium metavanadate, 2-6 parts of ammonium metatungstate, 200-240 parts of monoethanolamine aqueous solution, 60-80 parts of water, 15-25 parts of plasticizer, 14 parts of linking agent ~21 parts, the connecting agent includes titanium carbide and silicon powder, the weight ratio of titanium carbide and silicon powder is 4:3.

By adopting the above technical scheme, during the preparation process of the support body, the pore-forming agent plays a role, so that small holes appear on the support body. When the denitrification layer is attached, the monoethanolamine aqueous solution is used as the main solvent to drive titanium carbide and silicon powder into the holes, and Attached to the inner wall of the hole, titanium carbide and silicon powder melt and infiltrate into the support body during the sintering process, thereby reinforcing the support body while improving the connection strength between the denitrification layer and the support body, reducing the de-nitration layer falling off.

Preferably, the preparation method of the denitration layer includes the following steps: in the case of covering the outside of the support body, dipping the denitration catalytic slurry on the inner wall of the support for 20 minutes, taking the support body out of the denitrification catalytic slurry, 100 ℃ environment for 3 hours, and then put the support body in 1350 ℃ environment heat preservation and sintering for 24 hours.

By adopting the above technical scheme, the denitrification catalytic slurry is initially attached to the inner wall of the support by impregnation, and then the denitrification layer is preliminarily shaped by drying, while reducing the probability of the denitrification layer falling off in the subsequent sintering process, and finally the denitrification layer is sintered. Fixed to the inner wall of the support.

Preferably, the dust removal layer is obtained by sintering the dust removal filter layer slurry adhered to the outer wall of the support body, and the dust removal filter layer slurry includes the following raw materials in parts by weight: 12-16 parts by weight of aluminum silicate fiber, modified carbon fiber 13-19 parts, film material 280-320 parts, monoethanolamine aqueous solution 80-120 parts, water 40-60 parts.

By adopting the above technical scheme, the membrane material forms a dust removal filter membrane during the sintering process, and the modified carbon fiber can effectively improve the connection strength of the dust removal filter membrane on the support body and reduce the possibility of the dust removal layer falling off.

Preferably, the modified carbon fiber is prepared from the following raw materials: carbon fiber, tetrabutyl titanate and copper oxide, and the weight ratio of the carbon fiber, tetrabutyl titanate and copper oxide is 5:3:1.

By adopting the above technical scheme, the carbon fiber is modified by tetrabutyl titanate and copper oxide, and titanium dioxide and copper oxide are loaded on the surface of the carbon fiber, thereby improving the connection stability between the carbon fiber, the support body and the dust filter membrane.

Preferably, the preparation method of the modified carbon fiber comprises the following steps: mixing and stirring copper oxide and tetrabutyl titanate evenly, impregnating the carbon fiber in it, and then placing the mixture of carbon fiber, tetrabutyl titanate and copper oxide in The modified carbon fibers were obtained by calcining at 500°C for 2 hours.

By adopting the above technical scheme, tetrabutyl titanate is converted into titanium dioxide during the calcination process. At this time, the carbon fiber is affected by calcination and a scaly structure appears on the surface, which makes it easier to support titanium dioxide and copper oxide. The properties of titanium dioxide and copper oxide are stable in subsequent sintering Therefore, the connection strength of the modified carbon fiber to the dust filter membrane and the support body can be improved.

Preferably, the film material includes boron oxide, aluminum oxide, cordierite, mullite and silicon carbide, and the weight ratio of boron oxide, aluminum oxide, cordierite, mullite and silicon carbide is 5:9:8:8 :10.

By adopting the above technical scheme, boron oxide and aluminum oxide are used as promoting components to promote the formation of dust removal filter membranes of cordierite, mullite and silicon carbide, so as to realize the early filtration of smoke and dust and reduce the damage to the support body caused by particle impact.

Preferably, the preparation method of the dust-removing layer comprises the following steps: in the case of covering the inner wall of the support, impregnating the slurry of the dust-removing filter layer on the outer wall of the support for 20 minutes, and taking the support out of the denitrification catalytic slurry , drying at 100°C for 3 hours, and then placing the support at 1350°C for 24 hours.

By adopting the above technical scheme, the slurry of the dust removal filter layer is initially attached to the outer wall of the support body by impregnation, and then the dust removal layer is preliminarily finalized by drying, while reducing the probability of the dust removal layer falling off in the subsequent sintering process, and finally the dust removal layer is sintered. The layer is fixed to the outer wall of the support body.

Preferably, a mold is used in the preparation process of the denitrification layer and the dust removal layer, the mold includes an outer support cylinder, the outer support cylinder is a cylinder with one end closed, and the unclosed end of the outer support cylinder is set upwards, the The outer support cylinder is detachably connected with an inner support cylinder, the inner support cylinder and the outer support cylinder are coaxially arranged, the inner support cylinder is a cylinder with one end closed, and the unclosed end of the inner support cylinder is set upward, so The outer supporting cylinder and the inner supporting cylinder form an accommodating cavity for accommodating the supporting body, and the supporting body is spaced apart from the side wall of the accommodating cavity.

By adopting the above technical scheme, the support body is installed in the accommodation chamber, the dust removal filter layer slurry is injected between the outer wall of the support body and the side wall of the accommodation chamber, and the denitrification catalytic slurry is injected between the inner wall of the support body and the side wall of the accommodation chamber, Take it out after soaking for 20 minutes, which can realize the simultaneous preparation of the denitrification layer and the dust removal layer, and effectively improve the work efficiency.

Preferably, the winding layer is formed by winding multiple layers of aluminum silicate fiber cloth, and its mesh diameter is 0.1mm.

By adopting the above technical scheme, the aluminum silicate fiber cloth layer is wound to form a winding layer, so as to filter the smoke for the first time, reduce the impact of large-diameter smoke particles on the dust removal layer, and reduce the possibility of the dust removal layer falling off.

In the second aspect, the present application provides a production process of a ceramic fiber filter tube, which adopts the following technical scheme: a production process of a ceramic fiber filter tube, comprising the following steps: first mixing the raw materials of the sintered body, and sintering at 1250°C A support body with a mounting ring is made, the denitrification layer is sintered on the inner wall of the support, the dust removal layer is sintered on the outer wall of the support, and finally the winding layer is installed on the outer wall of the dust removal layer to protect the dust removal layer.

By adopting the above technical scheme, the support body is prepared by sintering first, then the denitrification layer and the dust removal layer are prepared at the same time, and finally the winding layer is installed to complete the preparation, and the production process is simple.

In summary, the application has the following beneficial effects:

1. Due to the role of the pore-forming agent in the preparation process of the support body of this application, small holes appear on the support body. When attaching the denitrification layer, the monoethanolamine aqueous solution is used as the main solvent to drive titanium carbide and silicon powder into the holes, and attach On the inner wall of the hole, titanium carbide and silicon powder melt and infiltrate into the support body during the sintering process, so as to reinforce the support body and improve the connection strength between the denitrification layer and the support body, reducing the denitrification layer falling off.

2. In this application, tetrabutyl titanate is converted into titanium dioxide during the calcination process. At this time, the carbon fiber is affected by calcination and a scaly structure appears on the surface, so that it is easier to load titanium dioxide and copper oxide. The membrane material forms a dust removal filter membrane during the sintering process. The properties of titanium dioxide and copper oxide are stable in the subsequent sintering, so that the connection strength of the modified carbon fiber to the dust filter membrane and the support body can be improved, and the possibility of detachment of the dust layer is reduced.

3. In the preparation process of the dust-removing layer of the present application, boron oxide and alumina are used as promoting components to promote the formation of dust-removing filter membranes of cordierite, mullite and silicon carbide, so as to realize the early filtration of smoke and dust and reduce the impact of particle impact on the support body. damage.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of Embodiment 1 of the present application;

FIG. 2 is a schematic cross-sectional view of a part of the structure of Embodiment 1 of the present application;

Fig. 3 is a schematic cross-sectional view of part of the structure of Embodiment 2 of the present application;

Fig. 4 is a schematic cross-sectional view of part of the structure of Embodiment 2 of the present application;

Fig. 5 is a schematic cross-sectional view of part of the structure of Embodiment 2 of the present application;

Explanation of reference signs: 1. support body; 2. installation ring; 3. denitrification layer; 4. dust removal layer; 5. winding layer; 6. outer support cylinder; 61. positioning groove; 7. inner support cylinder; 8. installation Assembly; 81, positioning rod; 82, fixed ring.

Detailed ways

In this application, the length of aluminum silicate fiber is 3-5mm; the inorganic binder is a mixture of silica sol and titanium sol, and the weight ratio of the two is 2:1; the organic binder is polyvinyl alcohol, hydroxypropyl Acute cellulose and polyethylene oxide, the weight ratio of the three is 3:5:4; the pore-forming agent is mixed with PMMA and ammonium carbonate, and the weight ratio of the two is 1:1; the mass fraction of monoethanolamine aqueous solution is 1 %; Lubricant is mixed with glycerin and stearic acid, and the weight ratio of the two is 2:1; Plasticizer is mixed with lactic acid, hydroxymethyl cellulose and kaolin, and the ratio of the three is 1:1: 3. The particle size of titanium carbide is 2 microns; the particle size of silicon powder is 75 microns; the length of carbon fiber is 2-3 mm; tetrabutyl titanate is purchased from the market; copper oxide is ultrafine copper oxide with a particle size of 50 nm; boron oxide The fineness is 325 meshes; the fineness of alumina is 325 meshes; the fineness of cordierite is 325 meshes; the fineness of mullite is 325 meshes; the fineness of silicon carbide is 325 meshes.

The present application will be described in further detail below in conjunction with the examples.

Preparation example

Preparation Example 1

This preparation example discloses a modified carbon fiber, which is prepared by the following steps:

Copper oxide and tetrabutyl titanate were mixed and stirred evenly, carbon fibers were impregnated therein, and then the mixture of carbon fibers, tetrabutyl titanate and copper oxide was baked at 500°C for 2 hours to obtain modified carbon fibers.

Preparation example 2

This preparation example discloses a support, which is prepared by the following steps:

Stir and mix 240kg of aluminum silicate fiber, 2kg of inorganic binder, 2kg of organic binder, 3kg of pore-forming agent, 3kg of monoethanolamine aqueous solution and 1kg of lubricant. After the corresponding shape is obtained, dry it in a 100°C environment It was set for 1 hour, and then baked in an environment of 1250°C for 24 hours to obtain a support.

Preparation example 3

This preparation example discloses a support, which is prepared by the following steps:

Stir and mix 270kg of aluminum silicate fiber, 3kg of inorganic binder, 3kg of organic binder, 4kg of pore-forming agent, 5kg of monoethanolamine aqueous solution and 2kg of lubricant. After the corresponding shape is obtained, dry it in a 100°C environment It was set for 1 hour, and then baked in an environment of 1250°C for 24 hours to obtain a support.

Preparation Example 4

This preparation example discloses a support, which is prepared by the following steps:

Stir and mix 300kg of aluminum silicate fiber, 4kg of inorganic binder, 4kg of organic binder, 5kg of pore-forming agent, 7kg of monoethanolamine aqueous solution and 3kg of lubricant. After the corresponding shape is obtained, dry it in a 100°C environment It was set for 1 hour, and then baked in an environment of 1250°C for 24 hours to obtain a support.

Preparation Example 5

This preparation example discloses a support body, which is different from preparation example 3 in that no pore-forming agent is added.

Preparation example 6

This preparation example discloses a denitrification catalytic slurry, which is prepared by the following steps:

Stir and mix 10kg aluminum silicate fiber, 5kg denitration catalyst fiber, 500kg titanium dioxide, 1kg ammonium metavanadate, 2kg ammonium metatungstate, 200kg monoethanolamine aqueous solution, 60kg water, 15kg plasticizer, 8kg titanium carbide and 6kg silicon powder uniform.

Preparation Example 7

This preparation example discloses a denitrification catalytic slurry, which is prepared by the following steps:

Stir 15kg aluminum silicate fiber, 10kg denitration catalyst fiber, 550kg titanium dioxide, 3kg ammonium metavanadate, 4kg ammonium metatungstate, 220kg monoethanolamine aqueous solution, 70kg water, 20kg plasticizer, 10kg titanium carbide and 7.5kg silicon powder well mixed.

Preparation example 8

This preparation example discloses a denitrification catalytic slurry, which is prepared by the following steps:

Stir and mix 20kg aluminum silicate fiber, 15kg denitration catalyst fiber, 600kg titanium dioxide, 5kg ammonium metavanadate, 6kg ammonium metatungstate, 240kg monoethanolamine aqueous solution, 80kg water, 25kg plasticizer, 12kg titanium carbide and 9kg silicon powder uniform.

Preparation Example 9

This preparation example discloses a denitrification catalytic slurry, which is different from preparation example 7 in that:

No titanium carbide was added.

Preparation Example 10

This preparation example discloses a denitrification catalytic slurry, which is different from preparation example 7 in that:

No silicon powder added.

Preparation Example 11

This preparation example discloses a denitrification catalytic slurry, which is different from preparation example 7 in that:

Silicon powder and titanium carbide are not added.

Preparation Example 12

This preparation example discloses a dust removal filter layer slurry, which is prepared by the following steps:

12kg aluminum silicate fiber, 13kg modified carbon fiber prepared in Preparation Example 1, 35kg boron oxide, 63kg alumina, 56kg cordierite, 56kg mullite, 70kg silicon carbide, 80kg monoethanolamine aqueous solution and 40kg water were stirred and mixed evenly.

Preparation Example 13

This preparation example discloses a dust removal filter layer slurry, which is prepared by the following steps:

14kg aluminum silicate fiber, 16kg modified carbon fiber prepared in Preparation Example 1, 37.5kg boron oxide, 67.5kg aluminum oxide, 60kg cordierite, 60kg mullite, 75kg silicon carbide, 100kg monoethanolamine aqueous solution and 50kg water were stirred and mixed uniform.

Preparation Example 14

This preparation example discloses a dust removal filter layer slurry, which is prepared by the following steps:

16kg aluminum silicate fiber, 19kg modified carbon fiber prepared in Preparation Example 1, 40kg boron oxide, 72kg alumina, 64kg cordierite, 64kg mullite, 80kg silicon carbide, 120kg monoethanolamine aqueous solution and 60kg water were stirred and mixed evenly.

Preparation Example 15

This preparation example discloses a dust removal filter layer slurry, which is different from preparation example 13 in that:

Carbon fiber is used instead of modified carbon fiber.

Example

Example 1

This embodiment discloses a ceramic fiber filter tube. Referring to FIG. 1 and FIG. 2 , it includes a cylindrical support body 1 with one end closed, and an unclosed end of the support body 1 is coaxially fixedly connected with a mounting ring 2 . A denitrification layer 3 is prepared on the inner wall of the support body 1, and a dust removal layer 4 is prepared on the outer wall of the support body 1. The side of the dust removal layer 4 facing away from the support body is wound with multiple layers of aluminum silicate fiber cloth to form a winding layer 5 for protecting the dust removal layer 4. , the mesh diameter of the winding layer 5 is 0.1mm.

The implementation principle of a ceramic fiber filter tube in this embodiment is as follows: when the support body 1 is prepared, the installation ring 2 is integrally formed, and then the denitrification layer 3 is prepared on the inner wall of the support body 1, and the dust removal layer 4 is prepared on the outer wall of the support body 1, and then the dust removal layer 4, winding multi-layer aluminum silicate fiber cloth to form winding layer 5.

Example 2

This embodiment discloses a mold used in the production of ceramic fiber filter tubes. With reference to FIG. Install group 8 on.

Referring to Fig. 3 and Fig. 4, the outer support cylinder 6 is a cylinder with one end closed, and the unclosed end of the outer support cylinder 6 is set upward. The inner support tube 7 is a cylinder with one end closed, and the unclosed end of the inner support tube 7 is set upward. The outer support cylinder 6 and the inner support cylinder 7 are coaxially arranged, and the inner support cylinder 7 is located in the outer support cylinder 6. The outer support cylinder 6 and the inner support cylinder 7 form an accommodation cavity for accommodating the support body 1, and the support body 1 and the accommodation chamber side Wall spacer settings.

3 and 5, the mounting assembly 8 includes a positioning rod 81 fixedly connected to the upper end of the inner support cylinder 7, the length direction of the positioning rod 81 is perpendicular to the axial direction of the inner support cylinder 7, and the positioning rod 81 passes through the inner support cylinder 7 upper circle centers. The upper end of the outer support cylinder 6 is provided with two positioning grooves 61 corresponding to the two ends of the positioning rod 81 in the length direction, and the two ends of the positioning rod 81 are snapped into the positioning grooves 61 . A fixing ring 82 for fixing the mounting ring 2 is fixedly connected to the positioning rod 81, and the fixing ring 82 is formed by winding two soft metal wires.

The implementation principle of the mold used in the production of a ceramic fiber filter tube in this embodiment is: fix the inner support cylinder 7 with the installation ring 2 on the support body 1 through the fixing ring 82, and then put the support body 1 into the outer support cylinder 6, The positioning rod 81 enters the positioning groove 61, adds the dust removal filter layer slurry between the outer wall of the support body 1 and the outer support cylinder 6, and adds the denitrification catalytic slurry between the inner wall of the support body 10 and the inner support cylinder 7, and takes it out after soaking for 20 minutes, that is, Subsequent processing is possible.

Example 3

This embodiment discloses a preparation method of a ceramic fiber filter tube, which comprises the following steps:

The support body prepared in Preparation Example 2 was simultaneously impregnated with the denitrification catalytic slurry prepared in Preparation Example 6 and the dust removal filter layer slurry prepared in Preparation Example 12 through a mold. After soaking for 20 minutes, take it out and dry it in an environment of 100°C for 3 hours, then place it in an environment of 1350°C for sintering for 24 hours, and wind it after cooling to form a winding layer.

Example 4

This embodiment discloses a method for preparing a ceramic fiber filter tube, which includes the following steps: simultaneously impregnating the support body prepared in Preparation Example 3 with the denitrification catalytic slurry prepared in Preparation Example 7 and the dust removal filter prepared in Preparation Example 13 through a mold. Filter slurry. After soaking for 20 minutes, take it out and dry it in an environment of 100°C for 3 hours, then place it in an environment of 1350°C for sintering for 24 hours, and wind it after cooling to form a winding layer.

Example 5

This embodiment discloses a preparation method of a ceramic fiber filter tube, which includes the following steps: simultaneously impregnating the denitrification catalytic slurry prepared in Preparation Example 8 and the dedusting filter prepared in Preparation Example 14 through a mold through a mold. Filter slurry. After soaking for 20 minutes, take it out and dry it in an environment of 100°C for 3 hours, then place it in an environment of 1350°C for sintering for 24 hours, and wind it after cooling to form a winding layer.

Example 6

This embodiment discloses a preparation method of a ceramic fiber filter tube, which differs from that of Embodiment 4 in that the dust filter layer slurry used is prepared in Preparation Example 15.

comparative example

Comparative example 1

This comparative example discloses a method for preparing a ceramic fiber filter tube, which is different from Example 4 in that: the support body is prepared in Preparation Example 5.

Comparative example 2

This comparative example discloses a method for preparing a ceramic fiber filter tube, which differs from Example 4 in that the denitrification catalytic slurry used is prepared in Preparation Example 9.

Comparative example 3

This comparative example discloses a preparation method of a ceramic fiber filter tube, which is different from Example 4 in that the denitrification catalytic slurry used is prepared in Preparation Example 10.

Comparative example 4

This comparative example discloses a method for preparing a ceramic fiber filter tube, which is different from Example 4 in that: the support body is prepared in Preparation Example 5, and the denitrification catalytic slurry used is prepared in Preparation Example 9.

Comparative example 5

This comparative example discloses a preparation method of a ceramic fiber filter tube, which is different from Example 4 in that: the support body is prepared in Preparation Example 5, and the denitrification catalytic slurry used is prepared in Preparation Example 10.

Comparative example 6

This comparative example discloses a preparation method of a ceramic fiber filter tube, which is different from Example 4 in that the denitrification catalytic slurry used is prepared in Preparation Example 11.

Comparative example 7

This comparative example discloses a method for preparing a ceramic fiber filter tube, which is different from Example 4 in that: the support body is prepared in Preparation Example 5, and the denitrification catalytic slurry used is prepared in Preparation Example 11.

performance test

Set up the corresponding detection test. The specific operation is to use the prepared ceramic fiber filter tube for flue gas purification at 800°C, with a flue gas flow rate of 5.5m/s, and test the flue gas denitrification and dust removal on the 7th and 56th days of purification respectively. efficiency.

Table 1 Flue gas denitrification and dust removal efficiency table

Combining Example 4 and Comparative Examples 1-7 with Table 1, it can be seen that microscopic pores are formed on the support due to the influence of the pore-forming agent. Titanium and silicon powder enter the hole and adhere to the inner wall of the hole. After entering the sintering process, titanium carbide and silicon powder are melted and infiltrated into the support body, thereby reinforcing the support body while improving the connection strength between the denitrification layer and the support body, reducing the probability of the denitrification layer falling off, and reducing the impact on the denitrification performance of the ceramic fiber filter tube. Influence.

In combination with Example 4 and Example 6 and in combination with Table 1, it can be seen that tetrabutyl titanate is converted into titanium dioxide during the calcination process. At this time, the carbon fiber is affected by calcination and a scaly structure appears on the surface, thereby making it easier to load titanium dioxide and copper oxide. The properties of titanium dioxide and copper oxide are stable in the subsequent sintering, so that the connection strength of the modified carbon fiber to the dust filter membrane and the support body can be improved, and the detachment of the dust layer can be reduced, thereby reducing the impact on the dust removal performance of the ceramic fiber filter tube.

This specific embodiment is only an explanation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications to this embodiment without creative contribution according to needs after reading this specification, but as long as the rights of this application All claims are protected by patent law.

Claims (10)

1. The ceramic fiber filter tube is characterized by comprising a cylindrical support body (1), wherein one end of the support body (1) is closed, one end of the support body (1) which is not closed is coaxially and fixedly connected with a mounting ring (2), a denitration layer (3) is arranged on the inner wall of the support body (1), a dust removal layer (4) is arranged on the outer wall of the support body (1), and a winding layer (5) for protecting the dust removal layer (4) is arranged on one side, deviating from the support body (1), of the dust removal layer (4);

the support body (1) is prepared from the following raw materials in parts by weight: 240-300 parts of aluminum silicate fiber, 2-4 parts of inorganic binder, 2-4 parts of organic binder, 3-5 parts of pore-forming agent, 3-7 parts of monoethanolamine aqueous solution and 1-3 parts of lubricant;

the denitration layer (3) is formed by sintering denitration catalytic slurry adhered to the inner wall of the support body (1), and the denitration catalytic slurry comprises the following raw materials in parts by weight: 10-20 parts of aluminum silicate fiber, 5-15 parts of denitration catalyst fiber, 500-600 parts of titanium dioxide, 1-5 parts of ammonium metavanadate, 2-6 parts of ammonium metatungstate, 200-240 parts of monoethanolamine aqueous solution, 60-80 parts of water, 15-25 parts of plasticizer and 14-21 parts of connecting agent, wherein the connecting agent comprises titanium carbide and silicon powder, and the weight ratio of the titanium carbide to the silicon powder is 4:3.

2. A ceramic fiber filter tube according to claim 1, wherein: the preparation method of the denitration layer (3) comprises the following steps: under the condition that the outer side of the support body (1) is shielded, the denitration catalytic slurry is soaked on the inner wall of the support body (1) for 20min, the support body (1) is taken out from the denitration catalytic slurry, dried for 3h in the environment of 100 ℃, and then the support body (1) is placed in the environment of 1350 ℃ for heat preservation and sintering for 24 h.

3. A ceramic fiber filter tube according to claim 1, wherein: the dedusting layer (4) is formed by adhering dedusting filter layer slurry to the outer wall of the support body (1) through sintering, and the dedusting filter layer slurry comprises the following raw materials in parts by weight: 12-16 parts of aluminum silicate fiber, 13-19 parts of modified carbon fiber, 280-320 parts of membrane material, 80-120 parts of monoethanolamine aqueous solution and 40-60 parts of water.

4. A ceramic fiber filter tube according to claim 3, wherein: the modified carbon fiber is prepared from the following raw materials: the carbon fiber, the tetrabutyl titanate and the copper oxide are in a weight ratio of 5:3:1.

5. The ceramic fiber filter tube of claim 4, wherein: the preparation method of the modified carbon fiber comprises the following steps: and (3) mixing and stirring the copper oxide and the tetrabutyl titanate uniformly, dipping the carbon fiber in the mixture, and then placing the mixture of the carbon fiber, the tetrabutyl titanate and the copper oxide in an environment of 500 ℃ for roasting for 2 hours to obtain the modified carbon fiber.

6. A ceramic fiber filter tube according to claim 3, wherein: the membrane material comprises boron oxide, aluminum oxide, cordierite, mullite and silicon carbide, wherein the weight ratio of the boron oxide to the aluminum oxide to the cordierite to the mullite to the silicon carbide is 5:9:8:8:10.

7. A ceramic fiber filter tube according to claim 3, wherein: the preparation method of the dust removing layer (4) comprises the following steps: under the condition that the inner wall of the support body (1) is shielded, the dust-removing filter layer slurry is soaked on the outer wall of the support body (1) for 20min, the support body (1) is taken out from the denitration catalytic slurry, dried for 3h in the environment of 100 ℃, and then the support body (1) is placed in the environment of 1350 ℃ for heat preservation and sintering for 24 h.

8. The ceramic fiber filter tube of claim 7, wherein: the denitration layer (3) and the dust removal layer (4) use the mould in the preparation process, the mould includes outer support section of thick bamboo (6), outer support section of thick bamboo (7) are one end confined drum, outer support section of thick bamboo (6) do not seal one end and set up, can dismantle in outer support section of thick bamboo (6) and be connected with interior support section of thick bamboo (7), interior support section of thick bamboo (7) and outer support section of thick bamboo (6) coaxial setting, interior support section of thick bamboo (7) are one end confined drum, interior support section of thick bamboo (7) do not seal one end and set up, outer support section of thick bamboo (6) and interior support section of thick bamboo (7) form the holding chamber that holds supporter (1), supporter (1) and holding chamber lateral wall interval setting.

9. A ceramic fiber filter tube according to claim 1, wherein: the winding layer (5) is formed by winding a plurality of aluminum silicate fiber cloth layers, and the mesh diameter of the winding layer is 0.1mm.

10. The process for producing a ceramic fiber filter tube according to any one of claims 1 to 9, comprising the steps of: firstly, mixing raw materials of a sintered body, sintering the raw materials at 1250 ℃ to prepare a support body (1) with a mounting ring (2), then sintering a denitration layer (3) on the inner wall of the support body (1), sintering a dust removal layer (4) on the outer wall of the support body (1), and finally, mounting a winding layer (5) on the outer wall of the dust removal layer (4) to protect the dust removal layer (4).

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