CN115779561B - Ceramic fiber filter tube for dust removal and denitration of metallurgical coking furnace and preparation method thereof - Google Patents
Ceramic fiber filter tube for dust removal and denitration of metallurgical coking furnace and preparation method thereof Download PDFInfo
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Abstract
The application discloses a preparation method of a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace, and belongs to the technical field of ceramic membranes. The application firstly prepares a ceramic fiber filter tube matrix by an extrusion molding and medium-low temperature sintering method, and then adopts a tube inner wall rotary infiltration dropping method to load a catalyst; the prepared ceramic fiber filter tube can be used below 500 ℃ for a long time, has better thermal shock resistance at the temperature, has higher strength, longer service life and lower working pressure difference, and meanwhile, the catalytic particle slurry of the ceramic fiber filter tube can smoothly penetrate through a fiber tube supporting layer and be adsorbed on fibers, so that on one hand, higher specific surface area is obtained, and the reaction efficiency is improved; on the other hand, high load rate is obtained, and the conversion efficiency of NOx is improved; the dust removal performance and the secondary load catalytic capability of the catalyst can be recovered by soaking, washing and drying with clear water.
Description
Technical Field
The application belongs to the technical field of ceramic filter pipes, and particularly relates to a ceramic fiber filter pipe for dust removal and denitration of a metallurgical coking furnace and a preparation method thereof.
Background
The filter cylinder in the existing metallurgical coking furnace dedusting and denitration system is mainly a cloth bag or a sintering-free fiber pipe. The bag dust removal cannot be used for a long time in a high-temperature dust removal environment with the temperature of more than 250 ℃ and has a lower service life. The denitration of the sulfur-containing flue gas needs a high temperature of more than 280 ℃, the flue gas needs to be cooled firstly and then heated up to reach the denitration reaction temperature through a cloth bag system, and the energy consumption is high. The sintering-free fiber pipe can withstand the temperature of more than 280 ℃, but the high dust concentration in the dust removal and denitration system of the metallurgical coking furnace requires frequent high-pressure air blowback ash discharge, so that the sintering-free fiber pipe is frequently broken to cause the dust removal and denitration system to stop, and the time and labor are wasted when the filter cylinder is replaced, and high consumable cost is brought.
On the other hand, the existing denitration SCR catalyst is mainly loaded by adopting a slurry soaking method, and the method has high production efficiency, but a large amount of catalyst is accumulated on the surface of the carrier and cannot be uniformly loaded, and catalyst particles accumulated on the surface form blockage, so that the pressure difference is improved, and the energy consumption is increased; and the waste slurry of the soaking method is difficult to treat, and has low environmental protection and economy.
Disclosure of Invention
Aiming at the defects existing in the prior art, the technical problem to be solved by the application is to provide a preparation method of the ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace, so that the obtained product has better tube body strength, long service life within 500 ℃ and heat shock resistance.
In order to solve the technical problems, the application adopts the following technical scheme:
a preparation method of a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace comprises the following specific steps:
1) Preparing and mixing the mixture into liquid A according to the ratio of glycerin, polyvinyl alcohol, water= (4-5) and 18 (53-98); preparing powder according to the ratio of alumina fiber, clay, zinc borate, aluminum dihydrogen phosphate, talcum powder, pore-forming agent, plastic agent, aluminum stearate=100: (14-18), 8-11, 5:2-5, 20-45, 5:2; continuously spraying the liquid A to the powder while mixing in a high-speed mixer, mixing for 10-20 minutes to obtain a material B with the water content of 20% -35%, and putting the material B into a kneader to be kneaded for 10-20 minutes to obtain a pipe extrusion pug;
2) Extruding the kneaded pipe extrusion pug into a through pipe, a flange ring and a pipe tail plug by a forming machine, drying at normal temperature, heating to 50 ℃, preserving heat for 12-24 hours, and heating to 80 ℃ and preserving heat for 24-36 hours;
3) The dried through pipe, the flange ring and the pipe tail plug are installed and burned, the temperature is raised to 300 ℃ from normal temperature for 3-8 hours after 5-10 hours, the temperature is raised to 800-1000 ℃ after 5-10 hours, the flameout is carried out after 3-8 hours, the temperature is lowered to 600 ℃ per minute at 5-10 ℃, the temperature is cooled to normal temperature at 3-5 ℃ per minute, and the through pipe, the flange ring and the pipe tail plug are obtained after cooling;
4) Bonding the through pipe, the flange ring and the pipe tail plug head, and drying in a dryer at 80-100 ℃ to obtain a support pipe body;
5) Preparing a mixture according to a ratio of alumina powder, clay, silica sol, plastic agent, polyvinyl alcohol, water=100: (3-6), 10: (0.5-1), 0.3-0.6 and 65, ball-milling for 2-6 hours, and mixing into a C slurry; uniformly spraying the slurry C on the sintered support pipe body by using high-pressure spraying equipment;
6) The support tube body sprayed with the membrane material is sent to a dryer for drying at 60-100 ℃ for 24-36 hours, the dried tube body is loaded and burned, the temperature is raised from normal temperature to 300 ℃ for 2-5 hours after 3-8 hours, the temperature is raised to 600-700 ℃ after 5-10 hours, the heat is preserved for 3-8 hours, and then the flameout is carried out, and the ceramic fiber filter tube is obtained after cooling;
7) Carrying out quantitative loading on a ceramic fiber filter tube by using 3-9% of vanadium-titanium SCR catalyst catalytic loading liquid E and inner wall rotary infiltration dropping equipment; and (3) conveying the ceramic fiber filter pipe loaded with the catalytic liquid into a dryer for drying at 60-100 ℃ for 24-36 hours, and obtaining the ceramic fiber filter pipe for dust removal and denitration of the metallurgical coking furnace.
In the step 1), the viscosity of the polyvinyl alcohol is 20-25 mPa.s.
In the step 1), the alumina content of the alumina fiber is more than or equal to 70%, the length after processing is 100-1000 mu m, clay is one or two of kaolin or bentonite, pore-forming agent is one or more of walnut shell powder, starch, PE pellets and wood dust, and the particle size D50 is 50-80 mu m; the plastic agent is one or two of sodium carboxymethyl cellulose or sodium hydroxypropyl methyl cellulose, and the molecular weight is 6000-20000.
In the step 2), the kneaded pipe extrusion pug is extruded into a through pipe, a flange ring and a pipe tail plug through a forming machine, is placed on a foam support and dried at normal temperature for 48 hours, is placed in a dryer, is heated from the normal temperature to 50 ℃ for 12-24 hours after 24-36 hours, is heated to 80 ℃ for 24-36 hours after 12-24 hours, and is heated to obtain a dried blank body to be burned.
In the step 4), the adhesive used for bonding is alumina silica sol polyvinyl alcohol: water=10:3: (0.1-0.15:1).
In the step 5), the pressure of high-pressure spraying equipment is 0.3-0.7 mpa.
In the step 5), the granularity distribution D50 of the alumina powder is 40-60 mu m, the clay is kaolin or bentonite, the solid content of silica sol is 30%, the plastic agent is sodium carboxymethyl cellulose or sodium hydroxypropyl methyl cellulose, the molecular weight is 4000-10000, and the viscosity of the polyvinyl alcohol is 20-25 mPa.s.
In the step 7), adding water into the vanadium-titanium SCR catalyst to prepare slurry with the solid content of 30%, and ball-milling for 3-10 hours to obtain slurry D with the granularity D50 of less than or equal to 3 mu m and D98 of less than or equal to 10 mu m; adding water into the ball-milled slurry D to prepare a catalytic loading solution E with 3-9% of solid content; taking the catalytic loading liquid E, and quantitatively loading each ceramic fiber filter tube by using inner wall rotary infiltration dropping equipment.
In the step 7), the window temperature of the vanadium-titanium SCR catalyst is 250-450 ℃, and the micropores of the catalyst are 15-25 nm.
The ceramic fiber filter pipe for dust removal and denitration is obtained by the preparation method of the ceramic fiber filter pipe for dust removal and denitration of the metallurgical coking furnace.
The beneficial effects are that: compared with the prior art, the application has the advantages that:
1) The ceramic fiber is adopted to be externally added with sintering aid, plastic agent and the like for extrusion molding, and compared with a sintering-free filter tube by a vacuum suction method, the sintering-free filter tube has almost no wastewater discharge.
2) The intermediate-low temperature sintering is adopted, so that the tube body strength, the long-term service life within 500 ℃ and the thermal shock resistance are better.
3) The sintered filter tube has the capability of cleaning and regenerating, and the filter tube with blockage or catalyst poisoning failure can recover the dust removal performance and the secondary load catalytic capability by soaking, washing and drying with clear water, so that the filter tube has better economical efficiency and environmental friendliness.
4) The accurate quantitative pipe inner wall seepage load is adopted, and the specially treated catalyst slurry can fully enter the pipe wall in a seepage mode and is attached to the fiber. Meanwhile, the load rate of each fiber pipe is ensured to be the same, no hazardous waste is discharged, and no influence is caused to the environment.
Drawings
FIG. 1 is a schematic structural view of a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace.
FIG. 2 is a schematic diagram of the structure of the inner wall rotary infiltration dropping apparatus.
Description of the embodiments
The application will be further illustrated with reference to specific examples, which are carried out on the basis of the technical solutions of the application, it being understood that these examples are only intended to illustrate the application and are not intended to limit the scope thereof.
Example 1
As shown in fig. 1, the ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace provided by the application consists of a catalytic support layer 1 and a separation layer 2, wherein the main body of the catalytic support layer 1 is ceramic fibers loaded with a catalyst 3 for denitration, and the main body of the separation layer 2 is an alumina and corundum membrane layer.
The preparation method of the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace comprises the following specific steps:
1) Preparing a liquid A and powder according to the components in the table 1, and mixing for 10-20 minutes in a high-speed mixer by adopting a mode of continuously spraying the liquid A to the powder to obtain a material B; and (3) putting the material B into a kneader, and kneading for 10-20 minutes to obtain the pipe extrusion pug.
2) And extruding the kneaded pipe extrusion pug into a through pipe, a flange ring and a pipe tail plug through a forming machine, placing the through pipe, the flange ring and the pipe tail plug on a foam support, drying at normal temperature for 48 hours, placing the through pipe extrusion pug into a dryer, heating the through pipe extrusion pug from normal temperature to 50 ℃ for 12-24 hours, heating the through pipe extrusion pug to 80 ℃ for 12-24 hours, and heating the through pipe extrusion pug to 80 ℃ for 24-36 hours, thus obtaining a dried blank to be burned.
3) And (3) loading and burning the dried through pipe, flange ring and pipe tail plug, heating to 300 ℃ from normal temperature for 5-10 hours, preserving heat for 3-8 hours, heating to 800-1000 ℃ for 5-10 hours, preserving heat for 3-8 hours, extinguishing fire, cooling to 600 ℃ at 5-10 ℃ per minute, cooling to normal temperature at 3-5 ℃ per minute, and cooling to obtain the through pipe, flange ring and pipe tail plug for later use.
4) Using adhesive (alumina silica sol: polyvinyl alcohol: water=10:3: (0.1-0.15:1, weight ratio) bonding and drying in a dryer at 80-100deg.C to obtain the support tube body.
5) Mixing the powder and the powder according to a mass ratio of alumina powder to clay to silica sol to plastic agent to polyvinyl alcohol to water=100 to (3-6) to 10 to (0.5-1) to (0.3-0.6) to 65, ball-milling the powder for 2-6 hours to obtain a C slurry, and uniformly spraying the C slurry on a sintered support tube by using high-pressure spraying equipment (pressure is 0.3-0.7 mpa) to ensure that the thickness after sintering is 50-120 mu m.
Wherein the alumina powder has a particle size distribution D50 of 40-60 μm. The clay is kaolin or bentonite. The solids content of the silica sol was 30%. The plastic agent is sodium carboxymethyl cellulose or sodium hydroxypropyl methyl cellulose, and the molecular weight of the plastic agent is 4000-10000. The viscosity of the polyvinyl alcohol is 20-25 mPa.s.
6) And (3) conveying the support tube body sprayed with the membrane material into a dryer at 60-100 ℃ for drying for 24-36 hours, loading and burning the dried tube body, heating from normal temperature to 300 ℃ for 2-5 hours after 3-8 hours, heating to 600-700 ℃ for 3-8 hours after 5-10 hours, extinguishing, and cooling to obtain the ceramic fiber filter tube.
7) Adding water into a vanadium-titanium SCR catalyst (commercially available) to prepare slurry with 30% of solid content, and ball-milling for 3-10 hours to obtain slurry D with the granularity D50 of less than or equal to 3 mu m and the granularity D98 of less than or equal to 10 mu m. And adding water into the ball-milled slurry D to prepare a catalytic loading solution E with the solid content of 3-9%. Quantitative catalytic loading liquid E is taken, and each ceramic fiber filter tube is quantitatively loaded by a special inner wall rotary infiltration dropping device (figure 2), so that the catalyst loading rate is ensured not to exceed 10 percent (preferably 4-8 percent). And (3) conveying the ceramic fiber filter tube loaded with the catalytic liquid into a dryer for drying for 24-36 hours at the temperature of 60-100 ℃. The ceramic fiber filter pipe after drying is the ceramic fiber filter pipe for dust removal and denitration of the metallurgical coking furnace. Wherein the window temperature of the vanadium-titanium SCR catalyst is 250-450 ℃, and the micropores of the catalyst are 15-25 nm.
The special inner wall rotary infiltration dropping device is shown in figure 2, and the loading device is composed of a computer and servo system 1, a catalyst slurry supply device 2, a ceramic fiber filter tube supporting rotary device 3 and a rotary infiltration dropping device 4. The catalyst slurry supply device 2 comprises a catalyst slurry container 21 and a magnetic stirrer 22 positioned in the catalyst slurry container 21, wherein the magnetic stirrer 22 continuously stirs the catalyst slurry 23 in the use process, so as to ensure that the catalyst slurry 23 is uniformly mixed. The ceramic fiber filter tube supporting and rotating device 3 comprises a bracket 31 and a double roller 32 (a rotary drum can also be arranged on the bracket 31), and a weighing sensor 33 is arranged on the bracket 31. In the use process, the double rollers 32 are driven by a motor to rotate at a constant speed, so that the ceramic fiber filter pipes positioned between the double rollers 32 are driven to rotate at a constant speed, and the weighing sensor 33 can collect the weight of the ceramic fiber filter pipes in real time and transmit data to the computer and the servo system 1. The rotary dripping device 4 comprises a hard liquid guide pipeline 41 and an x-axis bidirectional guide rail 42, and fine holes are densely distributed at the tail end of the hard liquid guide pipeline 41 and used for dripping catalyst slurry; the X-axis bi-directional guide 42 is used to support and drive the X-direction movement of the rigid catheter tube 41. The catalyst slurry container 21 is communicated with the hard liquid guide pipeline 41 through the liquid dropping pipeline 5, the electric control valve 6 is arranged on the liquid dropping pipeline 5, and the computer and servo system 1 is connected (or in communication connection) with the electric control valve 6, the x-axis bidirectional guide rail 42, the weighing sensor 33 and the driving motor of the double roller 32, and realizes the control of the electric control valve 6, the x-axis bidirectional guide rail 42 and the driving motor.
The loading process comprises the following steps: the prepared E liquid was poured into the catalyst slurry container 21, and the magnetic stirrer 22 was turned on. The qualified ceramic fiber filter tube 7 is placed on the double rollers 32, a load program control program (pre-programmed existing program) of the computer and the servo system 1 is opened, the hard liquid guide pipeline 41 is led into the ceramic fiber filter tube 7 through the x-axis bidirectional guide rail 42, the load is started, the program controls the hard liquid guide pipeline to reciprocate in the tube through the x-axis bidirectional guide rail, the catalyst load capacity of the ceramic fiber tube is obtained in real time according to the weight sensor 33, and the load liquid amount is precisely controlled through controlling the electric control valve 6 (electromagnetic valve).
In the embodiment, the ceramic fiber filter catalyst is carried by adopting a pipe inner wall rotary infiltration dropping method, and the catalyst is processed to have granularity which is matched with the pore diameter of the ceramic fiber filter pipe for dust removal and denitration in the embodiment through pretreatment (ball milling, grinding and the like), so that the catalytic particle slurry can smoothly penetrate through a fiber pipe supporting layer and be adsorbed on fibers, on one hand, a higher specific surface area is obtained, and the reaction efficiency is improved; on the other hand, high load rate is obtained, and the conversion efficiency of NOx is improved. Meanwhile, as the catalyst particles are uniformly dispersed in the supporting layer, the channels of the ceramic fiber filter tube are not blocked in microcosmic, which indicates that the working pressure difference of the ceramic fiber filter tube after the catalyst is loaded is not obviously improved.
Example 2
Ceramic fiber filter tubes for dust removal and denitration of metallurgical coke ovens were prepared by the method of example 1, and the products were subjected to performance testing, and the specific results are shown in table 2. The test method of the thermal shock resistance comprises the following steps: the sample was heated in a 700 ℃ oven for 15min, followed by quenching in room temperature air for 3min. The thermal shock resistance was characterized by the number of thermal cycles that resulted in fracture. The flexural strength of the product was tested according to the method GB/T6569-1986. The water absorption of the product was tested according to GB/T1966-1996 method. The testing method of the working pressure difference comprises the following steps: the loaded sample was connected to a SuperFlow backpressure meter, and the differential pressure at 1.2m/min was measured. The method for testing the NOx conversion efficiency comprises the following steps: placing the loaded sample in a glass tube, and introducing N mixed in proportion into one end 2 、O 2 、NO、NO 2 、SO 2 Mixed gas and NH 3 And (3) the other end of the glass tube is connected with a nitrogen oxide (NOx) conversion efficiency tester, the gas flow rate is controlled to be 1.2m/min, and the ratio of the reduction amount of NOx in the gas passing through the smoke tube sample to the NOx before passing is calculated, namely the NOx conversion efficiency.
In the table, catalyst loading=e liquid-solid content×ceramic fiber tube water absorption rate ≡ (E liquid-solid content-1) ×100%. The particle size (D50) of the walnut shell powder is 80 mu m. The molecular weight of the hydroxypropyl methylcellulose sodium is 15000.
The ceramic fiber filter tube matrix is prepared by the extrusion molding and low-medium temperature sintering methods, the prepared ceramic fiber filter tube can be used below 500 ℃ for a long time, has better thermal shock resistance at the temperature, has higher strength and service life and lower working pressure difference, and has the cleaning regeneration capability, and the ceramic fiber filter tube with blockage or catalyst poisoning failure can be recovered to the dust removal performance and the secondary catalyst loading capability by soaking, washing, drying and the like.
Comparative example 1
Comparative products were prepared by taking the formulation and preparation method of product 3 of example 2 as an example.
1. At liquid a configuration, comparative product 1:76 parts of water, comparative product 2:5 parts of glycerol+71 parts of water, comparative product 3:18 parts of polyvinyl alcohol plus 58 parts of water, and other components and preparation processes are unchanged.
In the step 2) of extruding the kneaded pipe extrusion pug into a through pipe, a flange ring and a pipe tail plug head through a forming machine, the comparison product 1 and the comparison product 3 cannot be extruded, so that the preparation of the products fails.
In the step 3), the dried through pipe, the flange ring and the pipe tail plug head are installed and burned, and the comparison product 3 influences the strength of the final product due to the bonding degree of the product components and is eliminated, so that a qualified product cannot be finally obtained.
2. When the slurry C is configured, the silica sol component is not added in the comparison product 4, the polyvinyl alcohol component is not added in the comparison product 5, the corresponding component dosage is replaced by water with the same dosage, and the other components are unchanged.
In the finished product prepared, the film layer of the comparison product 4 is easy to fall off, and the use effect and the service life of the product are affected. The separation layer of the comparison product 5 is uneven in thickness, effective dust removal cannot be carried out, the product is unqualified, and the product cannot be used.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (10)
1. The preparation method of the ceramic fiber filter tube for the dust removal and denitration of the metallurgical coking furnace is characterized by comprising the following specific steps:
1) Preparing and mixing the mixture into liquid A according to the ratio of glycerin, polyvinyl alcohol, water= (4-5) and 18 (53-98); preparing powder according to the ratio of alumina fiber, clay, zinc borate, aluminum dihydrogen phosphate, talcum powder, pore-forming agent, plastic agent, aluminum stearate=100: (14-18), 8-11, 5:2-5, 20-45, 5:2; continuously spraying the liquid A to the powder while mixing in a high-speed mixer, mixing for 10-20 minutes to obtain a material B with the water content of 20% -35%, and putting the material B into a kneader to be kneaded for 10-20 minutes to obtain a pipe extrusion pug;
2) Extruding the kneaded pipe extrusion pug into a through pipe, a flange ring and a pipe tail plug by a forming machine, drying at normal temperature, heating to 50 ℃, preserving heat for 12-24 hours, and heating to 80 ℃ and preserving heat for 24-36 hours;
3) The dried through pipe, the flange ring and the pipe tail plug are installed and burned, the temperature is raised to 300 ℃ from normal temperature for 3-8 hours after 5-10 hours, the temperature is raised to 800-1000 ℃ after 5-10 hours, the flameout is carried out after 3-8 hours, the temperature is lowered to 600 ℃ per minute at 5-10 ℃, the temperature is cooled to normal temperature at 3-5 ℃ per minute, and the through pipe, the flange ring and the pipe tail plug are obtained after cooling;
4) Bonding the through pipe, the flange ring and the pipe tail plug head, and drying in a dryer at 80-100 ℃ to obtain a support pipe body;
5) Preparing a mixture according to a ratio of alumina powder, clay, silica sol, plastic agent, polyvinyl alcohol, water=100: (3-6), 10: (0.5-1), 0.3-0.6 and 65, ball-milling for 2-6 hours, and mixing into a C slurry; uniformly spraying the slurry C on the sintered support pipe body by using high-pressure spraying equipment;
6) The support tube body sprayed with the membrane material is sent to a dryer for drying at 60-100 ℃ for 24-36 hours, the dried tube body is loaded and burned, the temperature is raised from normal temperature to 300 ℃ for 2-5 hours after 3-8 hours, the temperature is raised to 600-700 ℃ after 5-10 hours, the heat is preserved for 3-8 hours, and then the flameout is carried out, and the ceramic fiber filter tube is obtained after cooling;
7) Quantitatively loading the catalytic loading liquid E on the ceramic fiber filter pipe by using inner wall rotary infiltration dropping equipment; the ceramic fiber filter pipe loaded with the catalytic loading liquid E is sent to a dryer for drying at 60-100 ℃ for 24-36 hours, and then the ceramic fiber filter pipe for dust removal and denitration of the metallurgical coking furnace is obtained; wherein the catalytic loading liquid E is a vanadium-titanium SCR catalyst with 3-9% of solid content;
the inner wall rotary infiltration dropping device comprises a computer and a servo system (1), a catalyst slurry supply device (2), a ceramic fiber filter tube supporting rotary device (3) and a rotary infiltration dropping device (4); the catalyst slurry supply device (2) comprises a catalyst slurry container (21) and a magnetic stirrer (22) positioned in the catalyst slurry container (21), wherein the magnetic stirrer (22) continuously stirs the catalyst slurry (23) in the use process, so that the catalyst slurry (23) is uniformly mixed; the ceramic fiber filter tube supporting and rotating device (3) comprises a bracket (31) and a double roller (32) positioned on the bracket (31), wherein a weighing sensor (33) is arranged on the bracket (31); in the use process, the double rollers (32) are driven to rotate at a constant speed through a motor, so that the ceramic fiber filter pipes positioned between the double rollers (32) are driven to rotate at a constant speed, and the weighing sensor (33) collects the weight of the ceramic fiber filter pipes in real time and transmits data to the computer and the servo system (1); the rotary dripping device (4) comprises a hard liquid guide pipeline (41) and an x-axis bidirectional guide rail (42), and fine holes are densely distributed at the tail end of the hard liquid guide pipeline (41) and used for dripping catalyst slurry; the X-axis bidirectional guide rail (42) is used for supporting and driving the X-direction movement of the hard catheter tube (41); the catalyst slurry container (21) is communicated with the hard liquid guide pipeline (41) through the liquid dropping pipeline (5), an electric control valve (6) is arranged on the liquid dropping pipeline (5), and the computer and the servo system (1) are connected with the electric control valve (6), the x-axis bidirectional guide rail (42), the weighing sensor (33) and the driving motor of the double roller (32) and control over the electric control valve (6), the x-axis bidirectional guide rail (42) and the driving motor is realized.
2. The method for preparing a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace according to claim 1, wherein in the step 1), the viscosity of polyvinyl alcohol is 20-25 mpa·s.
3. The method for preparing the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace according to claim 1, wherein in the step 1), the alumina content of alumina fibers is more than or equal to 70%, the length after processing is 100-1000 μm, clay is one or two of kaolin and bentonite, a pore-forming agent is one or more of walnut shell powder, starch, PE pellets and wood chips, and the particle size D50 is 50-80 μm; the plastic agent is one or two of sodium carboxymethyl cellulose or sodium hydroxypropyl methyl cellulose, and the molecular weight is 6000-20000.
4. The method for preparing the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace according to claim 1, wherein in the step 2), the kneaded pipe extrusion pug is extruded into a through pipe, a flange ring and a pipe tail plug by a forming machine, is placed on a foam support for normal temperature drying for 48 hours, is placed in a dryer for 24-36 hours, is heated from normal temperature to 50 ℃ for 12-24 hours, is heated to 80 ℃ for 24-36 hours, and is heated to 80 ℃ for 12-24 hours, so that a dried blank body is obtained to be burned.
5. The method for preparing the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace according to claim 1, wherein in the step 4), the adhesive adopted in the bonding is alumina silica sol polyvinyl alcohol: water=10:3: (0.1-0.15:1).
6. The method for preparing a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace according to claim 1, wherein in the step 5), the pressure of the high-pressure spraying equipment is 0.3-0.7 mpa.
7. The method for preparing a ceramic fiber filter tube for dust removal and denitration of a metallurgical coking furnace according to claim 1, wherein in the step 5), alumina powder has a particle size distribution D50 of 40-60 μm, clay is kaolin or bentonite, silica sol has a solid content of 30%, a plastic agent is sodium carboxymethyl cellulose or sodium hydroxypropyl methyl cellulose, the molecular weight of the plastic agent is 4000-10000, and the viscosity of polyvinyl alcohol is 20-25 mPa.s.
8. The method for preparing the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace according to claim 1, wherein in the step 7), the vanadium-titanium SCR catalyst is added with water to prepare slurry with the solid content of 30%, and the slurry is ball-milled for 3-10 hours to obtain slurry D with the granularity D50 of less than or equal to 3 mu m and D98 of less than or equal to 10 mu m; adding water into the ball-milled slurry D to prepare a catalytic loading solution E with 3-9% of solid content; taking the catalytic loading liquid E, and quantitatively loading each ceramic fiber filter tube by using inner wall rotary infiltration dropping equipment.
9. The method for preparing the ceramic fiber filter tube for dust removal and denitration of the metallurgical coking furnace according to claim 1, wherein in the step 7), the window temperature of the vanadium-titanium SCR catalyst is 250-450 ℃, and the pore diameter of the catalyst micropore is 15-25 nm.
10. The ceramic fiber filter tube for dust removal and denitration obtained by the method for producing a ceramic fiber filter tube for dust removal and denitration of a metallurgical coke oven according to any one of claims 1 to 9.
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