CN114768401A - Processing technology for adding SCR denitration catalyst coating on metal fiber filter bag - Google Patents
Processing technology for adding SCR denitration catalyst coating on metal fiber filter bag Download PDFInfo
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- CN114768401A CN114768401A CN202210578615.7A CN202210578615A CN114768401A CN 114768401 A CN114768401 A CN 114768401A CN 202210578615 A CN202210578615 A CN 202210578615A CN 114768401 A CN114768401 A CN 114768401A
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- filter bag
- fibers
- metal fiber
- catalyst
- modified polytetrafluoroethylene
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- 239000000835 fiber Substances 0.000 title claims abstract description 95
- 239000003054 catalyst Substances 0.000 title claims abstract description 88
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 48
- 239000002184 metal Substances 0.000 title claims abstract description 48
- 239000011248 coating agent Substances 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 71
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 71
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 71
- 239000000843 powder Substances 0.000 claims abstract description 33
- 238000004140 cleaning Methods 0.000 claims abstract description 32
- 238000005245 sintering Methods 0.000 claims abstract description 22
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000000227 grinding Methods 0.000 claims abstract description 9
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims abstract description 8
- QQZMWMKOWKGPQY-UHFFFAOYSA-N cerium(3+);trinitrate;hexahydrate Chemical compound O.O.O.O.O.O.[Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O QQZMWMKOWKGPQY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000005336 cracking Methods 0.000 claims abstract description 5
- 239000003350 kerosene Substances 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 4
- 238000004821 distillation Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 16
- 239000000919 ceramic Substances 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract description 4
- 238000010408 sweeping Methods 0.000 description 11
- 230000017525 heat dissipation Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000007790 scraping Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 241001417527 Pempheridae Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/847—Vanadium, niobium or tantalum or polonium
- B01J23/8472—Vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a processing technology for adding an SCR denitration catalyst coating on a metal fiber filter bag, which comprises the following steps: treating ilmenite through a sulfuric acid process, adding ammonium metavanadate and cerous nitrate hexahydrate, distilling and concentrating, and roasting to obtain low-temperature SCR catalyst composite powder; grinding the polytetrafluoroethylene powder to obtain catalyst modified polytetrafluoroethylene powder; adding kerosene into the catalyst modified polytetrafluoroethylene powder, preparing catalyst modified polytetrafluoroethylene fibers by adopting a film cracking process, and blending the catalyst modified polytetrafluoroethylene fibers with the polytetrafluoroethylene short fibers; and step four, sintering the metal fibers in a roasting kiln, coating the blended fibers on the metal fibers for roasting kiln sintering, welding the fibers into a cylindrical filter bag, and cleaning the cylindrical filter bag by a cleaning device. Compare in ceramic filter bag, increased intensity, can be high temperature resistant, can do a little more, also can realize dust removal denitration integration operation again.
Description
Technical Field
The invention belongs to the technical field of filter bag processing, and particularly relates to a processing technology for adding an SCR denitration catalyst coating on a metal fiber filter bag.
Background
The dust removal and denitration technologies commonly used in power plants are independently carried out in two steps, namely, firstly, the dust passes through a dust removal device, and then enters a Selective Catalytic Reduction (SCR) denitration device with low dust; or denitrating and then dedusting. The two purification technologies have obvious defects that firstly, no mature low-temperature catalyst can be used, and the flue gas can be heated to a certain catalytic reaction temperature (300-4000C) for SCR denitration; the second dust can deposit on the SCR catalyst, blocking the pores and active sites of the SCR catalyst, resulting in a decrease in denitration efficiency.
The dust removal and denitration integrated comprehensive treatment technology and equipment are more and more emphasized and adopted due to simplified process and reduced investment, and ceramic tube filtration and metal fiber felt filter bags are ideal choices for the treatment of high-temperature flue gas (300 ℃). When the integrated comprehensive treatment of dust removal and denitration is carried out on high-temperature flue gas, the dust removal and denitration integration can be realized by the existing ceramic pipe integrated ceramic filter and catalyst denitration dust removal process, but the filter bag of the ceramic coated catalyst cannot be made too long due to the defect of low strength of a ceramic material, otherwise, the filter bag is easy to crack and break, the filter bag has limitation in use, and the denitration effect can be influenced to a certain extent. Compared with the existing filter material, the metal fiber filter bag has excellent performances of high temperature resistance, good air permeability, small pressure loss, corrosion resistance, easy processing and forming and the like, but the denitration catalyst coating on the metal fiber filter bag has the following problems that firstly, the metal and the catalyst are difficult to sinter together due to different sintering temperatures; secondly, the sintering strength can not meet the requirement due to the inconsistent thermal expansion of the two materials; thirdly, the coating thickness is not well defined. Therefore, a filter bag process for coating a catalyst on a metal fiber filter bag needs to be designed to realize the integrated operation of dust removal and denitration.
Disclosure of Invention
Therefore, the present invention is to solve the above-mentioned technical problems.
Therefore, the technical scheme is that the processing technology for adding the SCR denitration catalyst coating on the metal fiber filter bag comprises the following steps:
step one, ilmenite is treated through a sulfuric acid process to obtain metatitanic acid slurry, then ammonium metavanadate and cerous nitrate hexahydrate are added, distillation concentration is carried out after stirring, then roasting is carried out, and then grinding and screening are carried out to obtain low-temperature SCR catalyst composite powder;
grinding the low-temperature SCR catalyst composite powder and polytetrafluoroethylene powder to obtain catalyst modified polytetrafluoroethylene powder;
adding kerosene into the catalyst modified polytetrafluoroethylene powder, stirring, extruding to obtain solid low-temperature SCR catalyst modified polytetrafluoroethylene, pressing into a belt shape, preparing catalyst modified polytetrafluoroethylene fibers by adopting a film cracking process, and blending the catalyst modified polytetrafluoroethylene fibers with polytetrafluoroethylene chopped fibers;
and step four, sintering the metal fibers in a roasting kiln, coating the blended catalyst modified polytetrafluoroethylene fibers and polytetrafluoroethylene short fibers on the metal fibers for roasting kiln sintering, welding into a cylindrical filter bag, and cleaning by a cleaning device.
Preferably, in the fourth step, the thickness of the cylindrical filter screen is 0.2-3 mm.
Preferably, in the fourth step, the sintering temperature of the metal fiber in the roasting kiln is 1000-1200 ℃, the roasting time is 1-3 h, then the blended catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber are coated on the metal fiber to be sintered in the roasting kiln, the sintering temperature is 300-600 ℃, and the roasting time is 2-3 h.
Preferably, the mass of the ammonium metavanadate is 0.2-0.8% of the mass of the ilmenite.
Preferably, the mass of the cerous nitrate hexahydrate is 4-15% of the mass of the ilmenite.
Preferably, the mass percentage of the titanium dioxide in the ilmenite is 47-60%.
Preferably, the average diameter of the polytetrafluoroethylene powder is 20 to 60 μm.
Preferably, the extrusion pressure of the catalyst modified polytetrafluoroethylene powder is 2-4 Mpa.
Preferably, the extrusion time of the catalyst modified polytetrafluoroethylene powder is 5min to 8 min.
Preferably, the low-temperature SCR catalyst modified polytetrafluoroethylene chopped fiber accounts for 40-80% of the mass of the blended chopped fiber.
The technical scheme of the invention has the following advantages: the invention relates to a processing technology for adding an SCR denitration catalyst coating on a metal fiber filter bag, which comprises the following steps: step one, ilmenite is treated through a sulfuric acid process to obtain metatitanic acid slurry, then ammonium metavanadate and cerous nitrate hexahydrate are added, distillation concentration is carried out after stirring, then roasting is carried out, and then grinding and screening are carried out to obtain low-temperature SCR catalyst composite powder; grinding the low-temperature SCR catalyst composite powder and polytetrafluoroethylene powder to obtain catalyst modified polytetrafluoroethylene powder; adding kerosene into the catalyst modified polytetrafluoroethylene powder, stirring, extruding to obtain solid low-temperature SCR catalyst modified polytetrafluoroethylene, pressing into a belt shape, preparing catalyst modified polytetrafluoroethylene fibers by adopting a film cracking process, and blending the catalyst modified polytetrafluoroethylene fibers with polytetrafluoroethylene chopped fibers; and step four, sintering the metal fibers in a roasting kiln, coating the blended catalyst modified polytetrafluoroethylene fibers and polytetrafluoroethylene short fibers on the metal fibers for roasting kiln sintering, welding into a cylindrical filter bag, and cleaning by a cleaning device. Because the catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber are blended, the metal fiber is sintered in a roasting kiln, and then the blended catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber are coated on the metal fiber to be sintered in the roasting kiln, the problem that the sintering temperature of the catalyst and the sintering temperature of the metal fiber net are different is solved, the catalyst and the metal fiber net are sintered in sequence, the problem that the sintering strength is insufficient due to the fact that the thermal expansion of the catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber is different is solved, and the thickness of the catalyst can be manufactured according to the requirement. Compare in ceramic filter bag, increased intensity, can be high temperature resistant, the length that can do again is some, also can realize dust removal denitration integration operation.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a cleaning apparatus according to the present invention;
FIG. 2 is a schematic diagram of a control structure according to the present invention;
FIG. 3 is a schematic structural view of a dust removing apparatus according to the present invention;
FIG. 4 is a schematic view of the first gear and the eccentric disk of the present invention;
FIG. 5 is a schematic diagram of the path of a cleaning brush of the present invention;
wherein, 1-a base, 2-an electric telescopic rod, 3-a workbench, 4-a box body, 5-a supporting arm, 6-a disk, 7-a first eccentric column, 8-a sleeve, 9-a first screw rod, 10-a first motor, 11-a slide rail, 12-a slide block, 13-a first connecting rod, 14-a first connecting column, 15-a second connecting column, 16-a cylinder, 17-a first sweeping brush, 18-an L-shaped rod, 19-a second sweeping brush, 20-a scraping blade, 21-a heat dissipation fan, 22-a temperature sensor, 23-a controller, 24-a heat dissipation port, 25-a filter screen, 26-a power box, 27-a second motor, 28-a first gear, 29-an eccentric disk, 30-a circular ring and 31-a first swing rod, 32-a second connecting rod, 33-a cleaning brush, 34-a placing groove, 35-a sponge, 36-a second gear, 37-a second eccentric column, 38-a second swing rod, 39-a guide groove, 40-a slide block, 41-a fixing plate, 42-a slide groove, 43-a third motor, 44-a second screw rod, 45-an opening and 46-a liquid storage box.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must be in a particular orientation, constructed or operated in a particular orientation, and is not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention relates to a processing technology for adding an SCR denitration catalyst coating on a metal fiber filter bag, which comprises the following steps:
step one, ilmenite is treated through a sulfuric acid process to obtain metatitanic acid slurry, then ammonium metavanadate and cerous nitrate hexahydrate are added, distillation concentration is carried out after stirring, then roasting is carried out, and then grinding and screening are carried out to obtain low-temperature SCR catalyst composite powder;
grinding the low-temperature SCR catalyst composite powder and polytetrafluoroethylene powder to obtain catalyst modified polytetrafluoroethylene powder;
adding kerosene into the catalyst modified polytetrafluoroethylene powder, stirring, extruding to obtain solid low-temperature SCR catalyst modified polytetrafluoroethylene, pressing into a belt shape, preparing catalyst modified polytetrafluoroethylene fibers by adopting a film cracking process, and blending the catalyst modified polytetrafluoroethylene fibers with polytetrafluoroethylene chopped fibers;
and step four, sintering the metal fibers in a roasting kiln, coating the blended catalyst modified polytetrafluoroethylene fibers and polytetrafluoroethylene chopped fibers on the metal fibers, sintering in the roasting kiln, welding into a cylindrical filter bag, and cleaning by using a cleaning device.
In the fourth step, the thickness of the cylindrical filter screen is 0.2-3 mm. The sintering temperature of the metal fiber in a roasting kiln is 1000-1200 ℃, the roasting time is 1-3 h, the blended catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene chopped fiber are coated on the metal fiber to be sintered in the roasting kiln, the sintering temperature is 300-600 ℃, and the roasting time is 2-3 h. The mass of the ammonium metavanadate is 0.2-0.8% of the mass of the ilmenite, and the mass of the cerous nitrate hexahydrate is 4-15% of the mass of the ilmenite. The mass percentage of the titanium dioxide in the ilmenite is 47-60 percent. The average diameter of the polytetrafluoroethylene powder is 20-60 μm. The extrusion pressure of the catalyst modified polytetrafluoroethylene powder is 2-4 Mpa, and the extrusion time of the catalyst modified polytetrafluoroethylene powder is 5-8 min. The low-temperature SCR catalyst modified polytetrafluoroethylene chopped fiber accounts for 40-80% of the mass of the blended chopped fiber.
The working principle and the beneficial technical effects of the technical scheme are as follows: because the catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber are blended, the metal fiber is sintered in a roasting kiln, and then the blended catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene short fiber are coated on the metal fiber to be sintered in the roasting kiln, the problem that the sintering temperature of the catalyst and the metal fiber net is different is solved, the catalyst and the metal fiber net are sintered in sequence, the problem of insufficient sintering strength caused by inconsistent thermal expansion of the catalyst and the polytetrafluoroethylene fiber net is solved, and the thickness of the catalyst can be manufactured as required. Compare in ceramic filter bag, increased intensity, can be high temperature resistant, can do a little more, also can realize dust removal denitration integration operation again.
In one implementation, in the third step, the thickness of the coating of the catalyst is 0.2-3 mm, so that the influence of the thickness of the coating of the catalyst on the resistance of the filter bag is small.
In one embodiment, as shown in fig. 1-2, the cleaning device comprises: the device comprises a base 1, an electric telescopic rod 2 and a workbench 3, wherein the base 1 is provided with the electric telescopic rod 2, the output end of the electric telescopic rod 2 is upwards connected with the workbench 3, a box body 4 is arranged above the workbench 3, the box body 4 is connected with the base 1 through a supporting arm 5, a first motor 10 is arranged in the box body 4, the output shaft of the first motor 10 is connected with a disc 6, a first eccentric column 7 is arranged on the disc 6, the bottom end of the box body 4 is rotatably connected with a sleeve 8 in the vertical direction, a first screw 9 is connected with the inner thread of the sleeve 8, a slide rail 11 in the vertical direction is arranged above the first screw 9, the slide rail 11 is slidably connected with a slide block 12, one end of a first connecting rod 13 is rotatably connected with the first eccentric column 7, the other end of the first connecting rod 13 is hinged with the top end of the slide block 12, the bottom end of the slide block 12 is connected with the upper end of the first screw 9 through a first connecting column 14, the lower end of the first screw 9 is connected with one end of a second connecting column 15, the other end of the second connecting column 15 is connected with a cylinder 16, and a first sweeping brush 17 is arranged on the outer wall of the cylinder 16.
An L-shaped rod 18 is arranged on the outer wall of the bottom end of the sleeve 8, one end of the L-shaped rod 18 is vertically connected with the outer wall of the sleeve 8, the other end of the L-shaped rod 18 is downwards connected with a second sweeper 19, bristles of the second sweeper 19 face the cylinder 16, a scraping piece 20 is arranged on the vertical rod of the L-shaped rod 18, and the scraping piece 20 is located above the first sweeper 17.
The working principle and the beneficial technical effects of the technical scheme are as follows: the metal fiber filter bag is placed on a workbench 3, an electric telescopic rod 2 is started to push the workbench 3 to move upwards so that the filter bag is positioned between a first sweeping brush 17 and a second sweeping brush 19, a first motor 10 is started to drive a disc 6 and a first eccentric column 7 to rotate, the first eccentric column 7 drives a first connecting rod 13 to move, a sliding block 12 of the first connecting rod 13 reciprocates up and down along a sliding rail 11, the sliding block 12 drives a first screw rod 9, a cylinder 16 and the first sweeping brush 17 to reciprocate up and down, the first sweeping brush 17 cleans the inner wall of the filter bag, meanwhile, the first screw rod 9 moves up and down, as the first screw rod 9 is in threaded connection with a sleeve 8, an L-shaped rod 18 and a second sweeping brush 19 rotate, the second sweeping brush 19 cleans the outer wall of the metal fiber filter bag through rotation, in addition, when the first sweeping brush 17 moves to the uppermost end, the first sweeping brush 17 can be in contact with a scraping blade 20 rotating at a high speed, the wiper blade 20 wipes off the attached matter on the first brush 17, and keeps the first brush 17 clean.
In one embodiment, as shown in fig. 2, a heat dissipation fan 21 is disposed on an inner wall of the box 4, a temperature sensor 22 and a controller 23 are disposed on the inner wall of the box 4, the temperature sensor 22 is electrically connected to the controller 23, the controller 23 is electrically connected to the heat dissipation fan 21, the temperature sensor 22 can detect a temperature of an ambient environment, and when an alarm value is exceeded, the controller 23 starts the heat dissipation fan 21 to cool and dissipate heat.
In one embodiment, as shown in fig. 3 to 5, two heat dissipation openings 24 are spaced at the top end of the box 4, and a filter screen 25 is disposed on the heat dissipation openings 24.
Still include dust collector, dust collector includes: the device comprises a power box 26, a second motor 27, a first gear 28, an eccentric disc 29, a circular ring 30, a first swing rod 31, a second connecting rod 32, a cleaning brush 33, a placing groove 34 and a sponge 35;
the top end of the box body 4 is provided with a power box 26, the inner wall of the power box 26 is provided with a second motor 27, the output shaft of the second motor 27 is connected with a first gear 28, the end surface of the first gear 28 is provided with an eccentric disc 29, the eccentric disc 29 is connected with a ring 30 in a rotating manner, the outer circumferential wall of the ring 30 is connected with one end of a first swing rod 31, the axis of the first swing rod 31 penetrates through the center of the first gear 28, the other end of the first swing rod 31 is hinged with the middle part of a second connecting rod 32, one end of the second connecting rod 32 is provided with a cleaning brush 33, the cleaning brush 33 can be contacted with two filter screens 25, the center between the two filter screens 25 is provided with a placing groove 34, cleaning liquid is arranged in the placing groove 34, and a sponge 35 is arranged in the placing groove 34,
a second gear 36 is arranged on the side surface of the first gear 28, the second gear 36 is rotatably connected with the inner wall of the power box 26, the first gear 28 is engaged with the second gear 36, a second eccentric column 37 is arranged on the end surface of the second gear 36, one end of a second swing rod 38 is hinged with one end of the second connecting rod 32 far away from the cleaning brush 33, a guide slot 39 is arranged on the second swing rod 38, the second eccentric column 37 passes through the guide slot 39, the other end of the second swing rod 38 is hinged with a slide block 40, a fixing plate 41 is arranged on the inner wall of the power box 26, a slide slot 42 is arranged on the fixing plate 41, the slide slot 42 is slidably connected with the slide block 40, a third motor 43 is arranged in the slide slot 42, the output shaft of the third motor 43 is connected with one end of a second screw 44, and the other end of the second screw 44 passes through the slide block 40, and is in threaded connection with the slider 40, an opening 45 is arranged on the side wall of the power box 26, and both the first swing link 31 and the second swing link 38 pass through the opening 45.
The working principle and the beneficial technical effects of the technical scheme are as follows: the second motor 27 is started to drive the first gear 28 and the eccentric disc 29 to rotate, the second gear 36 and the second eccentric column 37 are driven to rotate by the engagement of the first gear 28 and the second gear 36, the second eccentric column 37 moves in the guide groove 39, the second swing rod 38 swings up and down in a reciprocating manner around the slide block 40, the second swing rod 38 drives the lower end of the second connecting rod 32 to swing up and down in a reciprocating manner, meanwhile, the ring 30 rotates around the center of the first gear 28 and rotates forward and backward alternately along the center of the circle, the ring 30 drives the first swing rod 31 to do plane compound motion, after the motions of the first swing rod 31 and the second connecting rod 32 are superposed, the cleaning brush 33 moves along a butterfly-shaped track, as shown in fig. 5, the cleaning brush 33 can intermittently clean the surfaces of the two filter screens 25, prevent the filter screens from being blocked, and reduce the influence on the heat dissipation performance, the cleaning brush 33 passes through the sponge 35 at the center every time, so that the cleaning solution is stained, the cleaning efficiency is improved, the cleaning solution can be saved, and the waste is avoided. When the cleaning range of the cleaning brush needs to be changed, the third motor 43 is started to drive the second screw 44 to reciprocate, the position of the sliding block 40 is changed, the position of the swing fulcrum of the second swing rod 38 is changed, the swing amplitude of the second swing rod 38 is changed, and therefore the moving range of the cleaning brush is adjusted, the butterfly-shaped track of the cleaning brush is enlarged or reduced, the edge of the opening 45 can be cleaned, or the cleaning range of the cleaning brush only needs to be reduced when the filter screen is not dirty.
In one embodiment, the top of the housing 4 is provided with a reservoir 46, the reservoir 46 is communicated with the placing groove 34, and the reservoir is used for providing cleaning liquid for the sponge 35.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A processing technology for adding an SCR denitration catalyst coating on a metal fiber filter bag is characterized by comprising the following steps:
step one, ilmenite is treated through a sulfuric acid process to obtain metatitanic acid slurry, then ammonium metavanadate and cerous nitrate hexahydrate are added, distillation concentration is carried out after stirring, then roasting is carried out, and then grinding and screening are carried out to obtain low-temperature SCR catalyst composite powder;
grinding the low-temperature SCR catalyst composite powder and polytetrafluoroethylene powder to obtain catalyst modified polytetrafluoroethylene powder;
adding kerosene into the catalyst modified polytetrafluoroethylene powder, stirring, extruding to obtain solid low-temperature SCR catalyst modified polytetrafluoroethylene, pressing into a belt shape, preparing catalyst modified polytetrafluoroethylene fibers by adopting a film cracking process, and blending the catalyst modified polytetrafluoroethylene fibers with polytetrafluoroethylene chopped fibers;
and step four, sintering the metal fibers in a roasting kiln, coating the blended catalyst modified polytetrafluoroethylene fibers and polytetrafluoroethylene short fibers on the metal fibers for roasting kiln sintering, welding into a cylindrical filter bag, and cleaning by a cleaning device.
2. The processing technology of adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein in the fourth step, the thickness of the cylindrical filter screen is 0.2-3 mm.
3. The process for processing the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein in the fourth step, the metal fiber is sintered in a roasting kiln at the temperature of 1000-1200 ℃ for 1-3 h, and then the blended catalyst modified polytetrafluoroethylene fiber and the polytetrafluoroethylene chopped fiber are coated on the metal fiber for sintering in the roasting kiln at the temperature of 300-600 ℃ for 2-3 h.
4. The processing technology for adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the mass of the ammonium metavanadate is 0.2-0.8% of the mass of the ilmenite.
5. The processing technology of adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the mass of the cerous nitrate hexahydrate is 4% -15% of the mass of the ilmenite.
6. The processing technology for adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the mass percentage of titanium dioxide in ilmenite is 47% -60%.
7. The processing technology of the metal fiber filter bag with the SCR denitration catalyst coating as claimed in claim 1, wherein the average diameter of the polytetrafluoroethylene powder is 20-60 μm.
8. The processing technology of adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the extrusion pressure of the catalyst modified polytetrafluoroethylene powder is 2-4 MPa.
9. The processing technology for adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the extrusion time of the catalyst modified polytetrafluoroethylene powder is 5-8 min.
10. The processing technology of adding the SCR denitration catalyst coating on the metal fiber filter bag according to claim 1, wherein the low-temperature SCR catalyst modified polytetrafluoroethylene chopped fiber accounts for 40% -80% of the mass of the total chopped fiber after blending.
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| US5179061A (en) * | 1990-07-19 | 1993-01-12 | Haerle Hans A | Filter or catalyst body |
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Application publication date: 20220722 |