Non-amino denitration dust removal catalytic filter bag and preparation method and application thereof

Abstract

The application discloses a non-amino denitration dust removal catalytic filter bag and a preparation method and application thereof, and belongs to the technical field of waste incineration flue gas purification. The method comprises the following steps: dispersing an auxiliary in a solvent, adding nitric acid to obtain a sol, adding catalyst powder into the sol and uniformly dispersing to obtain a base body loaded catalyst slurry; and spraying the obtained base body loaded catalyst slurry on a pretreated filter bag base body, drying, roasting, and obtaining a target product, namely, a catalytic filter bag. The application improves the production efficiency of the catalytic filter bag and reduces the labor intensity in the production of the catalytic filter bag.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste incineration flue gas purification, and in particular relates to a non-amino denitrification and dust removal catalytic filter bag, a preparation method and an application thereof. Background Art

[0002] Waste incineration technology has the advantages of volume reduction, quantity reduction, harmlessness and resource utilization, but the HCl, SO2 and NO generated during the incineration process x Pollutants such as particulate matter, heavy metals, and dioxins require a combination of multiple flue gas purification technologies to treat, which has problems such as complex systems and high costs. If the flue gas multi-pollutant synergistic removal technology is used to replace two or more removal technologies in the existing process, it can effectively simplify the process system and reduce the floor space, thereby reducing the cost of pollutant removal. The catalytic denitrification filter bag prepared by coupling the SCR denitrification catalyst with the dust removal filter material can achieve dust, NO x Synergistic and efficient removal of multiple pollutants.

[0003] Existing NO removal in flue gas x The SCR technology is based on the V2O5-WO3 / TiO2 catalyst, which can reduce NO x It reacts with amino reducing agents such as ammonia or urea to produce harmless N2 and H2O. However, this technology has two major problems. First, NH3 reacts with SO2 in the flue gas to form ammonium bisulfate, which clogs the catalyst pores, flue gas pipes, and valves, causing catalyst deactivation and affecting system stability. Second, during actual operation, excessive ammonia injection is often used to achieve the desired denitrification effect. NH3 escapes into the air and reacts with acidic substances in the air to form ammonia salt particles, affecting the atmospheric environment.

[0004] SCR methods that use methanol instead of NH3 as a reducing agent can completely solve the problems of ammonium sulfate formation and ammonia slip. Patent CN 116265113 A discloses an integrally extruded molecular sieve-based methanol-SCR denitrification catalyst, its preparation method, and its application. The denitrification catalyst uses a molecular sieve-based honeycomb ceramic as a matrix and includes a nitrogen oxide reduction zone and a CO oxidation zone. The matrix in the CO oxidation zone is loaded with a transition metal composite oxide. CN 116920590 A discloses a denitrification material and method for denitrifying cement kiln tail gas using methanol as a reducing agent. The material comprises independently packaged denitrifiers A, B, and C. Denitrifier A is formed by uniformly mixing a lanthanum-cerium solid solution, a discarded vanadium-based denitrification catalyst, and a perovskite-type composite metal oxide, and then grinding the mixture. Denitrifier B is formed by crushing coconut shell charcoal into small particles and uniformly mixing the particles with carbide slag powder. Denitrifier C is formed by uniformly mixing OMS-2 with one or more of zirconium oxide, cobalt oxide, and ferrosoferric oxide, then adding electrolytic manganese slag, mixing the mixture, and then grinding the mixture to a certain particle size. The denitrifiers are added to the cement production process through different methods to synergistically exert their denitrification effects, achieving denitrification in the cement kiln.

[0005] The aforementioned denitrification technologies using methanol as a reducing agent require a dedicated CO oxidation zone and the simultaneous addition of multiple denitrification agents. Existing catalytic filter bags that combine denitrification and dust removal also suffer from weak bonding strength between the catalyst and the filter media, resulting in relatively low denitrification efficiency. Summary of the Invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides a non-amino denitrification and dust removal catalytic filter bag, a preparation method and an application thereof.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for preparing a non-amino denitrification dust removal catalytic filter bag, the method comprising the following steps:

[0009] (1) Preparation of catalyst powder: Add an alcohol solvent to a dodecylamine solution and stir to form a microemulsion; then add copper salt, manganese salt, and nickel salt to the emulsion. After the salts are dissolved, add ammonia water and adjust to alkalinity. Finally, perform a hydrothermal crystallization reaction. After the reaction is completed, centrifuge, wash, dry, roast, and grind in sequence to obtain catalyst powder.

[0010] (2) Preparation of substrate-supported catalyst slurry: The additive is dispersed in a solvent and nitric acid is added to obtain a sol, and the catalyst powder is added to the sol and dispersed uniformly to obtain a substrate-supported catalyst slurry;

[0011] (3) The substrate-loaded catalyst slurry obtained in step (2) is sprayed onto the pretreated filter bag substrate, dried, and then calcined to obtain the target product catalytic filter bag.

[0012] In the above preparation method, the alcohol solvent in step (1) is n-butanol; the temperature of the hydrothermal crystallization reaction is 120-140° C., and the reaction time is 15-28 h.

[0013] In the above preparation method, the drying temperature in step (1) is 110-150°C, and the drying time is 4-8 hours; the roasting temperature is 600-700°C, and the roasting time is 6-10 hours.

[0014] In the above preparation method, the mass ratio of CuO, MnO and NiO in the catalyst powder in step (1) is 1.0~3.0:1.0~2.0:0.5~1.5.

[0015] In the above preparation method, in step (2), the additives are SB powder, carboxymethyl cellulose, or Tianqing powder; and the mass concentration of the catalyst in the matrix-supported catalyst slurry is 1-10%. Preferably, the additives are SB powder and carboxymethyl cellulose or Tianqing powder in a mass ratio of 1-20:0.1-1.

[0016] In the above preparation method, the drying temperature in step (3) is 105-115°C, the drying time is 3-6 hours, and the roasting temperature is 160-220°C, and the roasting time is 2-6 hours.

[0017] A non-amino denitrification dust removal catalytic filter bag is prepared by the above method. Further, the catalytic filter bag has a loading capacity of 300-600 g / m 2 .

[0018] In the technical solution of the present invention, the catalyst filter bag prepared by the method is used as a catalyst for denitrification and dust removal. Preferably, the catalytic reaction uses alcohol as a reducing agent, and more preferably, the reducing agent is methanol.

[0019] Further filter bag substrates include but are not limited to polyester materials such as polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), and polyimide (P84).

[0020] Furthermore, the applications include (1) catalytic partial pre-decomposition of methanol to form a steam mixture of methanol, H2, and CO; (2) introducing the steam mixture into a dust- and NO x In the flue gas from waste incineration, the filter bag matrix removes smoke dust, and the catalyst on the filter bag converts NO x Converted into N2 and H2O, achieving denitrification and dust removal in catalytic filter bags.

[0021] The present invention provides a non-amino denitrification and dust removal catalytic filter bag prepared by the following method but not limited to the following method.

[0022] (1) The filter bag matrix polytetrafluoroethylene (PTFE), polyphenylene sulfide (PPS), and polyimide (P84) were pretreated with 20% nitric acid to remove surface impurities. The immersion treatment was performed at 45°C for 2 hours. The filter bag matrix was then washed with deionized water and dried in a blast drying oven at 105°C for 2 hours to obtain the pretreated filter bag matrix.

[0023] (2) Weighing an appropriate amount of dodecylamine and mixing it with water, stirring, then adding an appropriate amount of n-butanol and stirring to form a microemulsion; adding copper nitrate, manganese nitrate and nickel nitrate to the solution, and after the salts are completely dissolved, adding ammonia water to the solution, adjusting the pH of the solution to 8-10, and then hydrothermally crystallizing the solution at 120-140°C for 15-28 hours, then centrifuging the precipitated product, washing three times, drying at 110-150°C for 4-8 hours, and roasting at 600-700°C for 6-10 hours. After naturally cooling to room temperature, grinding into a fine powder of 10-40 μm to obtain the non-amino denitration catalyst powder of the present invention;

[0024] (3) Add an appropriate amount of deionized water to a beaker, add SB powder, carboxymethyl cellulose / or Tianqing powder in sequence while stirring, then slowly add nitric acid with a concentration of 10% to obtain a uniform sol, then add the catalyst powder obtained in step (2), and ultrasonically homogenize for 2 to 4 hours to obtain a matrix-loaded catalyst slurry with a mass concentration of 1 to 10%;

[0025] (4) Use an automatic sprayer to apply the catalyst slurry on the filter bag substrate, dry it at 110℃ for 3~6h, repeat the spraying 2~5 times, and calcine it at 160~220℃ for 2~6h to obtain a catalyst loading of 300~600g / m 2 catalytic filter material.

[0026] The beneficial effects of the present invention are as follows: the present invention provides a non-amino denitration and dust removal catalytic filter bag, a preparation method and application thereof, a CuO-MnO-NiO ternary talc-like structure composition and a mixture thereof are non-amino denitration catalysts with high denitration efficiency; a non-amino methanol partial decomposition product (methanol, H2, CO steam mixture) is used as a denitration reducing agent, which completely eliminates the generation of ammonium sulfate (or ammonium bisulfate) and the problem of NH3 escape; at the same time, CO is used as a denitration reducing agent and is converted into CO2 during the denitration process, without the need for special treatment; SB powder and an additive are used to form a filter bag matrix loaded with a catalyst slurry, so that the matrix and the catalyst have stronger adhesion; automatic spraying technology is used to improve the production efficiency of the catalytic filter bag and reduce the labor intensity of the catalytic filter bag production. DETAILED DESCRIPTION

[0027] The present invention will be further described below through specific examples, and all examples are operated completely according to the steps described in the present invention. Example 1

[0028] (1) Treatment of filter bag substrate

[0029] Place the polytetrafluoroethylene (PTFE) filter bag material in a beaker, add a 20% (mass concentration) nitric acid solution, immerse it at 45°C for 2 hours, then wash it with deionized water, and place it in a forced air drying oven at 105°C for 2 hours to obtain the pretreated filter bag matrix.

[0030] (2) Preparation of DeNOx Catalyst Composition Powder

[0031] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 75.8g of Cu(NO3)2.6H2O (98.0%), 100.0g of Mn(NO3)2.4H2O (97.5%) and 39.7g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=1.0:1.0:0.5) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 8.5, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 120°C oven and subjected to hydrothermal crystallization reaction for 24 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 120°C for 5 hours, calcined at 620°C for 8 hours, naturally cooled to room temperature, and then ground into a fine powder of 10µm to obtain the non-amino denitration catalyst powder of the present invention.

[0032] (3) Preparation of substrate-loaded catalyst slurry

[0033] 300 g of deionized water was added to a 1000 mL beaker, and 10.0 g of SB powder (68% on a dry basis) and 0.2 g of carboxymethyl cellulose were added in sequence while stirring. Then, 6.5 g of 10% nitric acid was slowly added dropwise to obtain a uniform sol. 12.5 g of the fine powder of the catalyst with a particle size of 10 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 3 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 6.9%.

[0034] (4) Preparation of catalytic filter material

[0035] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 4 hours, sprayed three times, and calcined at 200°C for 4 hours to obtain a catalyst loading of 475 g / m 2 Catalytic filter material 1. Example 2

[0036] (1) Treatment of filter bag substrate

[0037] Place the polyphenylene sulfide (PPS) filter bag material in a beaker, add a nitric acid solution with a concentration of 20% (mass concentration), immerse it at 45°C for 2 hours, then wash it with deionized water, place it in a forced air drying oven at 105°C for 2 hours, and obtain the pretreated filter bag matrix.

[0038] (2) Preparation of DeNOx Catalyst Composition Powder

[0039] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 84.2g of Cu(NO3)2.6H2O (98.0%), 83.3g of Mn(NO3)2.4H2O (97.5%) and 44.1g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=2.0:1.5:1.0) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 8.5, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 130°C oven and subjected to hydrothermal crystallization reaction for 26 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 120°C for 5 hours, calcined at 660°C for 8 hours, naturally cooled to room temperature, and then ground into a fine powder of 10µm to obtain the non-amino denitration catalyst powder of the present invention.

[0040] (3) Preparation of substrate-loaded catalyst slurry

[0041] 300 g of deionized water was added to a 1000 mL beaker, and 12.5 g of SB powder (68% on a dry basis) and 0.3 g of carboxymethyl cellulose were added in sequence while stirring. Then, 9.8 g of 10% nitric acid was slowly added dropwise to obtain a uniform sol. 17.5 g of the fine powder of the catalyst with a particle size of 15 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 7.6%.

[0042] (4) Preparation of catalytic filter material

[0043] The catalyst slurry was coated on the polyphenylene sulfide (PPS) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 3 hours, sprayed four times, and calcined at 180°C for 5 hours to obtain a catalyst loading of 382 g / m 2 Catalytic filter material 2. Example 3

[0044] (1) Treatment of filter bag substrate

[0045] Place the polyimide (P84) filter bag material in a beaker, add a nitric acid solution with a concentration of 20% (mass concentration), immerse it at 45°C for 2 hours, then wash it with deionized water, place it in a forced air drying oven at 105°C for 2 hours, and obtain the pretreated filter bag matrix.

[0046] (2) Preparation of DeNOx Catalyst Composition Powder

[0047] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 94.7g of Cu(NO3)2.6H2O (98.0%), 20.0g of Mn(NO3)2.4H2O (97.5%) and 59.5g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=2.5:1.0:1.5) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 9.5, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 125°C oven and subjected to hydrothermal crystallization reaction for 28 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 140°C for 5 hours, calcined at 700°C for 6 hours, naturally cooled to room temperature, and then ground into a fine powder of 25µm to obtain the non-amino denitration catalyst powder of the present invention.

[0048] (3) Preparation of substrate-loaded catalyst slurry

[0049] 300 g of deionized water was added to a 1000 mL beaker, and 5.5 g of SB powder (68% on a dry basis) and 0.3 g of carboxymethyl cellulose were added in sequence while stirring. Then, 4.8 g of 10% nitric acid was slowly added dropwise to obtain a uniform sol. 5.5 g of the fine powder of the catalyst with a particle size of 15 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 3.6%.

[0050] (4) Preparation of catalytic filter material

[0051] The catalyst slurry was coated on the polyphenylene sulfide (PPS) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 6 hours, sprayed repeatedly 5 times, and calcined at 170°C for 6 hours to obtain a catalyst loading of 512 g / m 2 Catalytic filter material 3. Example 4

[0052] (1) Treatment of filter bag substrate

[0053] Place the polytetrafluoroethylene (PTFE) filter bag material in a beaker and add a 20% (mass concentration) nitric acid solution. Immerse the material at 45°C for 2 hours, then rinse with deionized water and dry in a forced air drying oven at 105°C for 2 hours to obtain the pretreated filter bag substrate.

[0054] (2) Preparation of DeNOx Catalyst Composition Powder

[0055] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 87.5g of Cu(NO3)2.6H2O (98.0%), 75.0g of Mn(NO3)2.4H2O (97.5%) and 45.6g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=3.0:2.0:1.5) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 9.0, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 140°C oven and subjected to hydrothermal crystallization reaction for 18 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 150°C for 4 hours, calcined at 680°C for 6 hours, naturally cooled to room temperature, and then ground into a fine powder of 25µm to obtain the non-amino denitration catalyst powder of the present invention.

[0056] (3) Preparation of substrate-loaded catalyst slurry

[0057] 300 g of deionized water was added to a 1000 mL beaker, and 3.5 g of SB powder (68% on a dry basis) and 0.2 g of carboxymethyl cellulose were added in sequence while stirring. Then, 3.8 g of 10% nitric acid was slowly added dropwise to obtain a uniform sol. 2.5 g of the fine powder of the catalyst with a particle size of 35 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 2.0%.

[0058] (4) Preparation of catalytic filter material

[0059] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 5 hours, sprayed three times, and calcined at 220°C for 3 hours to obtain a catalyst loading of 585 g / m 2 Catalytic filter material 4. Example 5

[0060] (1) Treatment of filter bag substrate

[0061] Place the polytetrafluoroethylene (PTFE) filter bag material in a beaker, add a 20% (mass concentration) nitric acid solution, immerse it at 45°C for 2 hours, then wash it with deionized water, and place it in a forced air drying oven at 105°C for 2 hours to obtain the pretreated filter bag matrix.

[0062] (2) Preparation of DeNOx Catalyst Composition Powder

[0063] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 70.8g of Cu(NO3)2.6H2O (98.0%), 125.0g of Mn(NO3)2.4H2O (97.5%) and 24.8g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=1.5:2.0:0.5) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 9.0, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 120°C oven and subjected to hydrothermal crystallization reaction for 24 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 130°C for 4 hours, calcined at 650°C for 8 hours, naturally cooled to room temperature, and then ground into a 40µm fine powder to obtain the non-amino denitration catalyst powder of the present invention.

[0064] (3) Preparation of substrate-loaded catalyst slurry

[0065] 300 g of deionized water was added to a 1000 mL beaker, and 15.5 g of SB powder (68% on a dry basis) and 0.3 g of carboxymethyl cellulose were added in sequence while stirring. Then, 20.5 g of nitric acid with a concentration of 10% was slowly added dropwise to obtain a uniform sol. 20.0 g of the fine powder of the catalyst with a particle size of 40 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 10.0%.

[0066] (4) Preparation of catalytic filter material

[0067] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 6 hours, sprayed twice, and calcined at 200°C for 6 hours to obtain a catalyst loading of 535 g / m 2 Catalytic filter material 5. Example 6

[0068] (1) Treatment of filter bag substrate

[0069] Place the polyphenylene sulfide (PPS) filter bag material in a beaker, add a nitric acid solution with a concentration of 20% (mass concentration), immerse it at 45°C for 2 hours, then wash it with deionized water, place it in a forced air drying oven at 105°C for 2 hours, and obtain the pretreated filter bag matrix.

[0070] (2) Preparation of DeNOx Catalyst Composition Powder

[0071] 1) Weigh 105.5g of dodecylamine, dissolve it in 1500mL of deionized water, add it to a three-necked flask, and start stirring; 2) Weigh 1000mL of n-butanol (mass percentage concentration ≥99.5), add it to the above three-necked flask, and stir until the dodecylamine is completely dissolved in the n-butanol to obtain a microemulsion liquid; 3) Weigh 63.1g of Cu(NO3)2.6H2O (98.0%), 83.3g of Mn(NO3)2.4H2O (97.5%) and 66.1g Ni(NO3)2.6H2O (98.0%) (weight ratio of CuO:MnO:NiO=1.5:1.5:1.5) are added to a three-necked flask; 4) when the solid is completely dissolved, an appropriate amount of ammonia water is added to adjust the pH value to 9.0, and the liquid is placed in a 5000ml reactor; 5) the reactor is placed in a 120°C oven and subjected to hydrothermal crystallization reaction for 26 hours. The product is centrifuged, washed twice with water, twice with alcohol, dried at 125°C for 6 hours, calcined at 680°C for 8 hours, naturally cooled to room temperature, and then ground into a 15µm fine powder to obtain the non-amino denitration catalyst powder of the present invention.

[0072] (3) Preparation of substrate-loaded catalyst slurry

[0073] 300 g of deionized water was added to a 1000 mL beaker, and 10.5 g of SB powder (68% on a dry basis) and 0.3 g of Tianqing powder were added in sequence while stirring. Then, 15.5 g of nitric acid with a concentration of 10% was slowly added dropwise to obtain a uniform sol. 12.0 g of the fine powder of the catalyst with a particle size of 15 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 6.7%.

[0074] (4) Preparation of catalytic filter material

[0075] The catalyst slurry was coated on the polyphenylene sulfide (PPS) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 5 hours, sprayed four times, and calcined at 180°C for 2 hours to obtain a catalyst loading of 435 g / m 2 Catalytic filter material 6. Example 7

[0076] (1) A polytetrafluoroethylene (PTFE) filter bag substrate is obtained by implementing the filter bag substrate treatment method of step (1) in step 1.

[0077] (2) 300 g of deionized water was added to a 1000 mL beaker, and 10.5 g of SB powder (68% on dry basis) and 0.3 g of Tianqing powder were added in sequence while stirring. Then, 15.5 g of nitric acid with a concentration of 10% was slowly added dropwise to obtain a uniform sol. 6.0 g of the fine powder of the catalyst obtained in step (2) of Example 1 and 4.0 g of the fine powder of the catalyst obtained in step (2) of Example 4 were added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 6.2%.

[0078] (4) Preparation of catalytic filter material

[0079] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 3 hours, sprayed three times, and calcined at 210°C for 5 hours to obtain a catalyst loading of 475 g / m 2 Catalytic filter material 7. Example 8

[0080] (1) A polyphenylene sulfide (PPS) filter bag substrate is obtained by implementing the filter bag substrate treatment method of step (1) in step 2.

[0081] (2) 300 g of deionized water was added to a 1000 mL beaker, and 10.5 g of SB powder (68% on a dry basis) and 0.3 g of carboxymethyl cellulose were added in sequence while stirring. Then, 15.5 g of nitric acid with a concentration of 10% was slowly added dropwise to obtain a uniform sol. 5.0 g of the fine powder of the catalyst obtained in step (2) of Example 2 and 5.0 g of the fine powder of the catalyst obtained in step (2) of Example 5 were added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 6.2%.

[0082] (4) Preparation of catalytic filter material

[0083] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 5 hours, sprayed four times, and calcined at 200°C for 6 hours to obtain a catalyst loading of 515 g / m 2Catalytic filter material 8. Comparative Example 1

[0084] (1) Treatment of the filter bag substrate and (2) Preparation of the denitration catalyst composition powder are exactly the same as the first two steps of Example 3.

[0085] (3) 300 g of deionized water and 3.7 g of carboxymethyl cellulose were added to a 1000 mL beaker while stirring, and then 3.8 g of 10% nitric acid was slowly added dropwise to obtain a uniform sol. 2.5 g of the catalyst powder with a particle size of 35 μm obtained in step (2) was added, and ultrasonic homogenization was performed for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 2.0%;

[0086] (4) Preparation of catalytic filter material

[0087] The catalyst slurry was coated on the polytetrafluoroethylene (PTFE) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 4 hours, sprayed three times, and calcined at 160°C for 6 hours to obtain a catalyst loading of 285 g / m 2 Comparative catalytic filter material 1. Comparative Example 2

[0088] (1) Treatment of the filter bag substrate and (2) Preparation of the denitration catalyst composition powder are exactly the same as the first two steps of Example 6.

[0089] (3) Add 300 g of deionized water to a 1000 mL beaker, add 10.8 g of Tianqing powder while stirring, and then slowly add 15.5 g of nitric acid with a concentration of 10% to obtain a uniform sol, and then add 12.0 g of fine powder of the catalyst with a particle size of 15 μm obtained in step (2), and ultrasonically homogenize for 4 hours to obtain a matrix-supported catalyst slurry with a mass concentration of 6.7%;

[0090] (4) Preparation of catalytic filter material

[0091] The catalyst slurry was coated on the polyphenylene sulfide (PPS) filter bag substrate treated in step (1) using an automatic sprayer, dried at 110°C for 6 hours, sprayed four times, and calcined at 185°C for 4 hours to obtain a catalyst loading of 205 g / m 2 Comparative catalytic filter material 2.

[0092] Performance testing

[0093] The performance evaluation of the non-amino denitrification dust removal catalytic filter bag prepared in the above examples and comparative examples was carried out by putting the catalytic filter bag on the sleeve. The evaluation conditions were: NO concentration in the flue gas was 420 mg / m 3, O2 volume fraction is 10%, water vapor content is 15% (volume ratio), SO2 concentration is 400mg / m 3 , dust concentration 2000mg / m 3 Methanol was carried by water vapor into the methanol pre-decomposition bed. The methanol / NO ratio ranged from 1.05 to 1.40, with N₂ as the carrier gas. The evaluation temperature range was 160°C to 240°C, with the evaluation temperature at 210°C. The methanol / NO ratio was 1.10, and the filtration velocity was 0.75 m / min (bag size). The performance of the catalytic filter bag was evaluated based on changes in NO and dust concentrations at the inlet and outlet. The results are shown in Table 1.

[0094]

[0095] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of the patent of the present invention cannot be limited by these embodiments alone. That is, any equivalent changes or modifications made to the spirit disclosed by the present invention still fall within the scope of the patent of the present invention.

Claims

1. A method for preparing a non-amino denitrification dust removal catalytic filter bag, characterized in that: The method comprises the following steps: (1) Preparation of catalyst powder: Add an alcohol solvent to a dodecylamine solution and stir to form a microemulsion; then add copper salt, manganese salt, and nickel salt to the emulsion. After the salts are dissolved, add ammonia water and adjust to alkalinity. Finally, perform a hydrothermal crystallization reaction. After the reaction is completed, centrifuge, wash, dry, roast, and grind in sequence to obtain catalyst powder. In step (1), the alcohol solvent is n-butanol; the temperature of the hydrothermal crystallization reaction is 120-140° C., and the reaction time is 15-28 h; the mass ratio of dodecylamine, deionized water, and n-butanol in the microemulsion liquid is 0.5-2:10-20:5-15; and the mass ratio of the metal salt to the microemulsion liquid is 15-25:20-30; The weight ratio of CuO, MnO and NiO in the catalyst powder in step (1) is 1.0-5.0:1.0-5.0:0.5-3; (2) Preparation of substrate-supported catalyst slurry: The additive is dispersed in a solvent and nitric acid is added to obtain a sol, and the catalyst powder is added to the sol and dispersed uniformly to obtain a substrate-supported catalyst slurry; (3) The substrate-loaded catalyst slurry obtained in step (2) is sprayed onto the pretreated filter bag substrate, dried, and then calcined to obtain the target product catalytic filter bag.

2. The method for preparing a non-amino denitrification dust removal catalytic filter bag according to claim 1, characterized in that: In step (1), the drying temperature is 110-150° C., and the drying time is 4-8 h; the roasting temperature is 600-700° C., and the roasting time is 6-10 h.

3. The method for preparing a non-amino denitrification dust removal catalytic filter bag according to claim 1, characterized in that: The weight ratio of CuO, MnO and NiO in the catalyst powder in step (1) is 1.0~3.0:1.0~2.0:0.5~1.

5.

4. The method for preparing a non-amino denitrification dust removal catalytic filter bag according to claim 1, characterized in that: In step (2), the auxiliary agents are two of SB powder, carboxymethyl cellulose and Tianqing powder, and the mass concentration of the catalyst in the matrix-loaded catalyst slurry is 1-10%.

5. The method for preparing a non-amino denitrification dust removal catalytic filter bag according to claim 4, characterized in that: The auxiliary agent is a combination of SB powder and carboxymethyl cellulose or a combination of SB powder and Tianqing powder in a mass ratio of 1-20:0.1-1.

6. The method for preparing a non-amino denitrification dust removal catalytic filter bag according to claim 1, characterized in that: In step (3), the drying temperature is 105-115° C., the drying time is 3-6 h, the roasting temperature is 160-220° C., and the roasting time is 2-6 h.

7. A non-amino denitrification dust removal catalytic filter bag, characterized in that: The product is prepared by the method according to any one of claims 1 to 6.

8. The non-amino denitrification dust removal catalytic filter bag according to claim 7, characterized in that: Catalytic filter bag loading is 300~600g / m 2 .

9. Use of the catalytic filter bag prepared by the preparation method according to claim 1 as a catalyst in denitrification and dust removal.

10. The use according to claim 9, characterized in that The catalytic reaction uses alcohols as reducing agents, and the reducing agent is methanol.

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