CN108543549B - Regeneration method of dedusting and denitration multifunctional filter material - Google Patents
Regeneration method of dedusting and denitration multifunctional filter material Download PDFInfo
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Abstract
The invention provides a regeneration method of a dedusting and denitration multifunctional catalytic filter material, which comprises the following specific steps: (1) preparing a cleaning solution; (2) preparing a regenerated catalytic filter membrane by adopting polytetrafluoroethylene powder, catalyst powder, a pore-forming agent, a coupling agent and a lubricating agent; (3) sweeping the poisoned or inactivated dedusting and denitration multifunctional filter material, cleaning the filter material by using a prepared cleaning solution, and then pretreating a filter material base cloth by using a treating agent; (4) and (3) hot-pressing and compounding the prepared regenerated catalytic filter membrane and the pretreated filter material base cloth through a hot-pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. The method can utilize the existing filter material preparation device, and can quickly complete the regeneration of the dedusting and denitration multifunctional filter material only by matching with a simple device, so that the regenerated multifunctional filter material is environment-friendly and efficient (the denitration activity is more than 90%). The invention has important significance for realizing the industrialization, the popularization and the application of the filter bag for simultaneously dedusting and denitrating the flue gas.
Description
Technical Field
The invention relates to the technical field of material processing and catalytic materials, in particular to a regeneration method of a dedusting and denitration multifunctional filter material.
Background
More than 6 hundred million people in China are seriously affected by haze every year, and dust and nitrogen oxide (NOx) are the main causes of haze. The discharge amount of NOx and dust in China is up to 2400 million tons/year and 1500 million tons/year respectively, which is the first discharge country in the world, the annual loss is over 3000 million yuan, and the treatment of the dust and the NOx becomes the urgent requirement of the atmospheric pollution treatment in China. At present, the mode of independent operation of dust removal and denitration (NOx removal) is mostly adopted at home and abroad. The dust removal adopts bag type, electric type and electric-bag composite technology, wherein the bag type dust removal technology is a trend of future development due to high PM2.5 removal performance; and Selective Catalytic Reduction (SCR) denitration technology (high efficiency, no secondary pollution, 98% adopted by power plants) is mainly adopted for denitration. However, for industries such as cement and steel, the SCR technology cannot be used due to the complexity of the working conditions and the absence of additional space for operating the denitration reactor. Therefore, stable and efficient denitration techniques are an urgent need in these industries. The filter material dedusting and denitration technology (dedusting and denitration multifunctional filter material) really realizes dual purposes by loading the catalyst on the filter material support body, and utilizes the existing deduster as a denitration reactor, so that new denitration equipment is not required to be added, the space occupied by SCR equipment and the capital investment can be saved, the cost of treating flue gas by enterprises is reduced, and the application prospect is very wide.
In the using process of the dedusting and denitration multifunctional filter material, K, Na, As and other oxides and fly ash in the flue gas can continuously abrade and poison the catalyst on the functional filter material, so that the denitration performance of the dedusting and denitration multifunctional filter material is reduced. The multifunctional filter material with reduced poisoning and activity can be reused by regeneration, the regeneration cost is only 30-50% of the updating cost, and the activity can be recovered to more than 90% of the original activity. The research on the regeneration of the SCR catalyst can prolong the service life of the multifunctional filter material, and has important significance for the large-scale popularization and application of the filter material dedusting and denitration technology. However, the regeneration method of the dedusting and denitration multifunctional filter material is only reported in China at present.
Disclosure of Invention
The invention aims to provide an efficient regeneration method of a dedusting and denitration multifunctional filter material, aiming at the defects, the regeneration method can utilize the existing filter material preparation device, and can quickly complete the regeneration of the dedusting and denitration multifunctional filter material only by matching with a simple device, so that the regenerated multifunctional filter material is environment-friendly, efficient (the denitration activity is more than 90%), free of pulverization and falling phenomena and good in impact resistance. The invention has important significance for realizing the industrialization, the popularization and the application of the filter bag for simultaneously dedusting and denitrating the flue gas.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a regeneration method of a dedusting and denitration multifunctional catalytic filter material comprises the following specific steps:
(1) preparation of cleaning solution
Weighing a certain amount of diffusant, ethanol and acid with the molar concentration of 0.02-3 mol/L, carrying out ultrasonic treatment for 30-360min, uniformly mixing the diffusant, the ethanol and the acid to prepare a cleaning solution.
(2) Preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: weighing polytetrafluoroethylene powder and Mn-La-Ce-Nb-O according to the proportionxThe composite oxide comprises composite oxide powder, a pore-forming agent, a coupling agent and a lubricating agent, and the mass percentage ratio is as follows:
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 800 revolutions per minute and the stirring time is 360 minutes, taking out the powder, and standing the powder for 24-48 hours at the temperature of 20-60 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of the temperature of 80-280 ℃, the pressure of 1-10Mpa and the processing speed of 0.1-2m/min so as to volatilize the diffusant and the lubricant. Finally, setting the longitudinal stretching multiple to be 5-10 times and the stretching temperature to be 200-280 ℃, and forming the regenerated catalytic filter membrane by biaxial pulling of the preform in a first direction and a second direction perpendicular to the first direction.
(3) Taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 60-120min by using 0.1-2MPa of oil-free compressed air to deeply blow the filter material;
(4) soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 20-600 minutes, removing the filter membrane adhered to the filter material and the alkali metal and the alkaline earth metal poisoning the catalyst, and then drying the filter material for 6-12 hours by using hot air at the temperature of 100 ℃ and 180 ℃ to remove the residual cleaning solution;
(5) dipping the filter material dried in the step (4) with a pretreating agent for 2-6min, and then drying at the temperature of 150-300 ℃ for 5-10min to finish the pretreatment of the filter material base cloth;
(6) and (3) compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) in a hot pressing manner through a hot pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. Wherein the parameters during hot-pressing compounding are as follows: the temperature is 180 ℃ and 280 ℃, the pressure is 5-10MPa, and the processing speed on the hot-pressing roller is 1-3 m/min.
Preferably, the mass ratio of the diffusant to the ethanol to the acid in the step (1) is (0.1-1): (0.1-1): 1; wherein the dispersing agent is alkylphenol polyoxyethylene, and the acid is one of nitric acid, sulfuric acid and hydrochloric acid.
Preference is given to Mn-La-Ce-Nb-O as described in step (2)xThe composite oxide has an element molar ratio of Mn/La/Ce/Nb of 1 (0.1-0.3): (0.1-1): (0.1-0.5), and the particle size of the catalyst powder is 0.1-0.5 um.
Preferably, the pore-forming agent in the step (2) is one of polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800.
Preferably, the lubricant in step (2) is one of oxidized polyethylene wax and isoparaffin solvent.
Preferably, the coupling agent in the step (2) is one of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane and gamma-aminopropylmethyldiethoxysilane.
Preferably, the pretreating agent in the step (5) is a mixed solution of 3% of polytetrafluoroethylene emulsion and JFC type fatty alcohol-polyoxyethylene ether and polyacrylate, and the mass ratio of the pretreating agent to the mixed solution is 1 (0.01-0.05) to (0.1-0.25).
Compared with the prior art, the invention has the beneficial effects that:
(1) the multifunctional dedusting and denitration filter material with the poisoning and activity reduction functions can be effectively cleaned and regenerated, and the filter material base cloth cannot be damaged in the regeneration process.
(2) The dedusting and denitration multifunctional filter material regenerated by the method has denitration activity higher than 90%, dedusting efficiency higher than 99%, no pulverization and shedding phenomenon and good impact resistance.
(3) The invention is not only suitable for dedusting and denitration multifunctional filter materials, but also suitable for various types of common dedusting filter materials (P84, PE, glass fiber filter materials and the like), and after regeneration, the common dedusting filter materials have the denitration function;
(4) the invention can effectively prolong the service life of the filter material with multiple dedusting and denitration functions, and has important significance for large-scale popularization and application of the dedusting and denitration technology of the filter material.
Detailed Description
The following specific examples further illustrate the invention, but the scope of the invention is not limited thereto.
Example 1
1. Preparation of cleaning solution
Weighing the diffusant alkylphenol polyoxyethylene ether, ethanol and nitric acid with the molar concentration of 0.02mol/L according to the mass ratio of 0.1:0.1:1, carrying out ultrasonic treatment for 30min, uniformly mixing the components, and preparing into a cleaning solution.
2. Preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: 100g (10%) of Mn-La-Ce-Nb-O was weighedxComposite oxide powder (Mn/La/Ce/Nb ═ 1:0.1: 0.1:0.1, catalyst powder average particle diameter 0.1um), 870g (87%) tetrafluoroethylene powder, 10g (1%) polyethylene glycol 400, 15g (1.5%) N- (β -aminoethyl) - γ -aminopropyltriethoxysilane, 5g (0.5%) oxidized polyethylene wax;
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 120 revolutions per minute, the stirring time is 360min, taking out the powder, and standing the powder for 48h at the temperature of 20 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of 80 ℃ of temperature, 10Mpa of pressure and 0.1m/min of processing speed so as to volatilize the diffusant and the lubricant. Finally, the regenerated catalytic filter membrane is formed by biaxial stretching of the preform in a first direction and in a second direction perpendicular to the first direction, setting the longitudinal stretching multiple to 5 times and the stretching temperature to 200 ℃.
3. Taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 120min by using 0.1MPa of oil-free compressed air to deeply blow the filter material;
4. soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 20 minutes, removing the filter membrane adhered to the filter material and alkali metals and alkaline earth metals poisoning the catalyst, and then drying the filter material for 12 hours by hot air at 100 ℃ to remove the residual cleaning solution;
5. soaking the filter material dried in the step 4 in a pretreatment agent formed by mixing 3% of polytetrafluoroethylene emulsion, JFC type fatty alcohol-polyoxyethylene ether and polyacrylate (the mass ratio is 1:0.01:0.1), soaking for 2min, and then drying for 10min at 150 ℃ to finish pretreatment of the filter material base cloth;
6. and (3) hot-pressing and compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) through a hot-pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. Wherein the parameters during hot-pressing compounding are as follows: the temperature is 180 ℃, the pressure is 5MPa, and the processing speed on a hot-pressing roller is 1 m/min.
NOxRemoving efficiency:
NOxthe removal efficiency test method comprises the following steps:
the experimental device consists of a gas distribution system, a flow control (mass flow meter), a gas mixer, a gas preheater, a catalytic reactor and a flue gas analysis system. The inner diameter Φ is 20 mm. The filter cloth is cut into a wafer with phi being 20mm, the wafer is placed in a fixed reactor, the temperature of the constant temperature area of the filter cloth is kept, and then the reactor is placed in a fixed tubular reactor. The simulated flue gas composition was: NO (600ppm), NH3(600ppm)、O2(8%) and carrier gas N2Composition, filtering wind speed 1m/min, NH3The reaction temperature is controlled at 200 ℃. The respective gas flow rates are controlled by mass flow meters. Before the gas enters the reactorMixing the raw materials by a gas mixer and heating by a heater. The NO concentrations at the inlet and outlet were measured by a KM9106(Kane) flue gas analyzer. In order to eliminate the influence of surface adsorption, the system starts to collect and test after the aeration operation is stable for 20-30 minutes.
The catalytic activity of the catalyst is reflected by the denitration activity of NO, which is calculated by the following formula:
denitration activity [ [ (C)0-C)/C0]×100％
In the formula, C0Is the initial concentration of NO, and C is the concentration of NO in the treated gas.
Example 2
1. Preparation of cleaning solution
Weighing the diffusant alkylphenol polyoxyethylene ether, ethanol and nitric acid with the molar concentration of 0.15mol/L according to the mass ratio of 0.5:0.3:1, carrying out ultrasonic treatment for 240min, uniformly mixing the components, and preparing into a cleaning solution.
2. Preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: 220g (22%) of Mn-La-Ce-Nb-O are weighedxComposite oxide powder (Mn/La/Ce/Nb ═ 1: 0.2: 0.25:0.25, catalyst powder average particle diameter 0.2um), 655g (65.5%) tetrafluoroethylene powder, 30g (3%) polyethylene glycol 600, 35g (3.5%) N- (β -aminoethyl) - γ -aminopropyltriethoxysilane, 60g (6%) isoparaffin solvent;
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 500 revolutions per minute, the stirring time is 180min, taking out the powder, and standing the powder for 30h at 35 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of 170 ℃, 4Mpa of pressure and 1.2m/min of processing speed so as to volatilize the diffusant and the lubricant. Finally, the regenerated catalytic filter membrane was formed by biaxial stretching of the preform in a first direction and in a second direction perpendicular to the first direction, setting the longitudinal stretching ratio to 8 times and the stretching temperature to 240 ℃.
3. Taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 90min by using 1.5MPa of oil-free compressed air to deeply blow the filter material;
4. soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 400 minutes, removing the filter membrane adhered to the filter material and alkali metals and alkaline earth metals poisoning the catalyst, and then drying the filter material for 8 hours by hot air at the temperature of 140 ℃ to remove the residual cleaning solution;
5. soaking the filter material dried in the step 4 in a pretreatment agent formed by mixing 3% of polytetrafluoroethylene emulsion, JFC type fatty alcohol-polyoxyethylene ether and polyacrylate (the mass ratio is 1:0.03:0.25), soaking for 4min, and then drying for 8min at 200 ℃ to finish pretreatment of the filter material base cloth;
6. and (3) hot-pressing and compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) through a hot-pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. Wherein the parameters during hot-pressing compounding are as follows: the temperature was 220 ℃, the pressure was 7MPa, and the processing speed on the hot-press roll was 1.8 m/min.
NOxRemoving efficiency:
NOxthe removal efficiency test method was the same as in example 1.
Example 3
1. Preparation of cleaning solution
Weighing diffusant alkylphenol polyoxyethylene ether, ethanol and sulfuric acid with the molar concentration of 3mol/L according to the mass ratio of 1:1:1, carrying out ultrasonic treatment for 360min, uniformly mixing the components, and preparing into cleaning fluid.
2. Preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: 300g (30%) of Mn-La-Ce-Nb-O is weighedxComposite oxide powder (Mn/La/Ce/Nb ═ 1: 0.3: 1:0.5, catalyst powder average particle diameter 0.5um), 500g (50%) tetrafluoroethylene powder, 50g (5%) polyethylene glycol 800, 50g (5%) N- (β -aminoethyl) - γ -aminopropyltriethoxysilane, 100g (10%) isoparaffin solvent;
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 800 revolutions per minute, the stirring time is 120min, taking out the powder, and standing the powder for 24h at the temperature of 60 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of the temperature of 280 ℃, the pressure of 1Mpa and the processing speed of 2m/min so as to volatilize the diffusant and the lubricant. Finally, the regenerated catalytic filter membrane is formed by biaxial stretching of the preform in a first direction and in a second direction perpendicular to the first direction, setting the longitudinal stretching multiple to 10 times and the stretching temperature to 280 ℃.
3. Taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 60min by using 2MPa of oil-free compressed air to deeply blow the filter material;
4. soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 600 minutes, removing the filter membrane adhered to the filter material and alkali metals and alkaline earth metals poisoning the catalyst, and then drying the filter material for 6 hours by hot air at 180 ℃ to remove the residual cleaning solution;
5. soaking the filter material dried in the step 4 in a pretreatment agent formed by mixing 3% of polytetrafluoroethylene emulsion, JFC type fatty alcohol-polyoxyethylene ether and polyacrylate (the mass ratio is 1:0.05:0.25), soaking for 6min, and then drying for 5min at 300 ℃ to finish pretreatment of the filter material base cloth;
6. and (3) hot-pressing and compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) through a hot-pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. Wherein the parameters during hot-pressing compounding are as follows: the temperature was 280 ℃, the pressure was 10MPa, and the processing speed on the hot-press roll was 3 m/min.
NOxRemoving efficiency:
NOxthe removal efficiency test method was the same as in example 1.
Example 4
1. Preparation of cleaning solution
Weighing diffusant alkylphenol polyoxyethylene ether, ethanol and hydrochloric acid with the molar concentration of 2mol/L according to the mass ratio of 0.5:0.5:1, carrying out ultrasonic treatment for 300min, uniformly mixing the materials, and preparing into cleaning liquid.
2. Preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: 180g (18%) of Mn-La-Ce-Nb-O are weighedxComposite oxide powder (Mn/La/Ce/Nb ═ 1: 0.3: 1:0.5, catalyst powder average particle size 0.5um), 720g (72%) tetrafluoroethylene powder, 30g (3%) polyethylene glycol 800, 20g (2%) γ -aminopropylmethyldiethoxysilane, 50g (5%) isoparaffin solvent;
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 600 revolutions per minute, the stirring time is 200min, taking out the powder, and standing the powder for 24h at the temperature of 40 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of 200 ℃ of temperature, 4Mpa of pressure and 1m/min of processing speed so as to volatilize the diffusant and the lubricant. Finally, the regenerated catalytic filter membrane is formed by biaxial stretching of the preform in a first direction and in a second direction perpendicular to the first direction, setting the longitudinal stretching multiple to 5 times and the stretching temperature to 200 ℃.
3. Taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 80min by using 1.5MPa of oil-free compressed air to deeply blow the filter material;
4. soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 300 minutes, removing a filter membrane adhered to the filter material and alkali metals and alkaline earth metals poisoning the catalyst, and then drying the filter material for 7 hours by hot air at 150 ℃ to remove the residual cleaning solution;
5. soaking the filter material dried in the step 4 in a pretreatment agent formed by mixing 3% of polytetrafluoroethylene emulsion, JFC type fatty alcohol-polyoxyethylene ether and polyacrylate (the mass ratio is 1:0.01:0.2), soaking for 6min, and then drying for 7min at 180 ℃ to finish pretreatment of the filter material base cloth;
6. and (3) hot-pressing and compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) through a hot-pressing roller, and cooling to obtain the regenerated multifunctional dedusting and denitration filter material. Wherein the parameters during hot-pressing compounding are as follows: the temperature was 200 ℃, the pressure was 7MPa, and the processing speed on the hot-press roll was 1.8 m/min.
NOxRemoving efficiency:
NOxthe removal efficiency test method was the same as in example 1.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (4)
1. A regeneration method of a dedusting and denitration multifunctional catalytic filter material is characterized by comprising the following specific steps:
(1) preparation of cleaning solution
Weighing a certain amount of diffusant, ethanol and acid with the molar concentration of 0.02-3 mol/L, carrying out ultrasonic treatment for 30-360min, uniformly mixing the diffusant, the ethanol and the acid to prepare a cleaning solution;
(2) preparation of regenerated catalytic filter membrane
Preparation of catalytic filter membrane blank
The first step is as follows: weighing polytetrafluoroethylene powder and Mn-La-Ce-Nb-O according to the proportionxThe composite oxide comprises composite oxide powder, a pore-forming agent, a coupling agent and a lubricating agent, and the mass percentage ratio is as follows:
Mn-La-Ce-Nb-Ox10-30% of composite oxide powder
50-87% of polytetrafluoroethylene powder
1 to 5 percent of pore-forming agent
0.5 to 10 percent of lubricant
1.5 to 5 percent of coupling agent;
the second step is that: putting the weighed powder into a stirrer for mixing and stirring, wherein the stirring speed is 800 revolutions per minute and the stirring time is 360 minutes, taking out the powder, and standing the powder for 24-48 hours at the temperature of 20-60 ℃ to obtain a catalytic filter membrane blank;
preparation of catalytic Filter Membrane
Extruding a strip-shaped preformed body through a pre-extrusion step, and then calendering the preformed body under the conditions of the temperature of 80-280 ℃, the pressure of 1-10MPa and the processing speed of 0.1-2m/min so as to volatilize the diffusant and the lubricant; finally, setting the longitudinal stretching multiple to be 5-10 times and the stretching temperature to be 200-280 ℃, and forming the regenerated catalytic filter membrane by biaxial stretching of the preformed body in the first direction and the second direction perpendicular to the first direction;
(3) taking the multifunctional dedusting and denitration filter material to be regenerated, and blowing the multifunctional dedusting and denitration filter material for 60-120min by using 0.1-2MPa of oil-free compressed air to deeply blow the filter material;
(4) soaking the swept multifunctional dedusting and denitration filter material in the cleaning solution prepared in the step (1) for 20-600 minutes, removing the filter membrane adhered to the filter material and the alkali metal and the alkaline earth metal poisoning the catalyst, and then drying the filter material for 6-12 hours by hot air at the temperature of 100 ℃ and 180 ℃ to remove the residual cleaning solution;
(5) dipping the filter material dried in the step (4) with a pretreating agent for 2-6min, and then drying at the temperature of 150-300 ℃ for 5-10min to finish the pretreatment of the filter material base cloth;
(6) hot-pressing and compounding the regenerated catalytic filter membrane prepared in the step (2) and the filter material base cloth pretreated in the step (5) through a hot pressing roller, and cooling to obtain a regenerated multifunctional dedusting and denitration filter material; wherein the parameters during hot-pressing compounding are as follows: the temperature is 180 ℃ and 280 ℃, the pressure is 5-10MPa, and the processing speed on the hot-pressing roller is 1-3 m/min;
the mass ratio of the diffusant, the ethanol and the acid in the step (1) is (0.1-1): (0.1-1): 1; wherein the dispersing agent is alkylphenol polyoxyethylene, and the acid is one of nitric acid, sulfuric acid and hydrochloric acid;
Mn-La-Ce-Nb-O described in step (2)xThe compound oxide has the element mole ratio of Mn/La/Ce/Nb =1 (0.1-0.3): (0.1-1): (0.1-0.5), the particle size of the catalyst powder is 0.1-0.5 μm;
the pretreating agent in the step (5) is a mixed solution of 3% of polytetrafluoroethylene emulsion and JFC type fatty alcohol-polyoxyethylene ether and polyacrylate, and the mass ratio of the pretreating agent to the mixed solution is 1 (0.01-0.05) to (0.1-0.25).
2. The method for regenerating the dedusting and denitration multifunctional catalytic filter material as claimed in claim 1, is characterized in that: the pore-forming agent in the step (2) is one of polyethylene glycol 400, polyethylene glycol 600 and polyethylene glycol 800.
3. The method for regenerating the dedusting and denitration multifunctional catalytic filter material as claimed in claim 1, is characterized in that: the lubricant in the step (2) is one of oxidized polyethylene wax and isoparaffin solvent.
4. The method for regenerating the dedusting and denitration multifunctional catalytic filter material as claimed in claim 1, is characterized in that: the coupling agent in the step (2) is one of N- (beta-aminoethyl) -gamma-aminopropyltriethoxysilane and gamma-aminopropylmethyldiethoxysilane.
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| CN110026253B (en) * | 2019-04-22 | 2022-02-01 | 南京信息工程大学 | Regeneration method of synergetic denitration and dioxin removal catalyst |
| CN110124535B (en) * | 2019-05-24 | 2021-09-10 | 南京信息工程大学 | Regeneration method of filter material with triple-effect catalytic function |
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