CN110743543B - Tail gas purification device containing three-way catalyst - Google Patents
Tail gas purification device containing three-way catalyst Download PDFInfo
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- CN110743543B CN110743543B CN201911021681.9A CN201911021681A CN110743543B CN 110743543 B CN110743543 B CN 110743543B CN 201911021681 A CN201911021681 A CN 201911021681A CN 110743543 B CN110743543 B CN 110743543B
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- circulating pipe
- shell
- pipe
- filter element
- cleaning
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- 239000003054 catalyst Substances 0.000 title claims abstract description 31
- 238000000746 purification Methods 0.000 title claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 115
- 239000007789 gas Substances 0.000 claims abstract description 73
- 230000003197 catalytic effect Effects 0.000 claims abstract description 46
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 34
- 238000000576 coating method Methods 0.000 claims description 34
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 12
- 239000006255 coating slurry Substances 0.000 claims description 11
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 10
- 239000010948 rhodium Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052878 cordierite Inorganic materials 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000006104 solid solution Substances 0.000 claims description 6
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 239000000779 smoke Substances 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 229910002091 carbon monoxide Inorganic materials 0.000 description 9
- 229930195733 hydrocarbon Natural products 0.000 description 8
- 150000002430 hydrocarbons Chemical class 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 229910001868 water Inorganic materials 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 239000011232 storage material Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 230000002337 anti-port Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 241000883990 Flabellum Species 0.000 description 1
- 229910017583 La2O Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- 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
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
-
- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2046—Periodically cooling catalytic reactors
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- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/04—Exhaust treating devices having provisions not otherwise provided for for regeneration or reactivation, e.g. of catalyst
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of catalyst preparation, and particularly relates to a tail gas purification device containing a three-way catalyst, which comprises a filter element, a shell and a vent pipe, wherein the filter element is arranged on the shell; the vent pipe is arranged on two sides of the shell and used for inputting and discharging tail gas; the shell is designed to be hollow; the filter element is arranged in the inner cavity of the shell; the filter element is provided with catalytic holes which are uniformly distributed; the catalytic pore spiral channel design; the bottom of the shell is fixedly connected with a circulating pipe; the circulating pipe is hollow and is communicated with the inner cavity of the shell; a plurality of cleaning balls are loaded in the circulating pipe in the initial state; the surface of the cleaning ball is designed to be uneven; a filter screen is fixedly connected between the shell and the right side vent pipe; the inner cavity of the cleaning ball is filled with light inert gas; the invention drives the cleaning balls to circularly reciprocate in the catalytic holes and the circulating pipe by the impulsive force of the airflow so as to clean the carbon smoke attached to the surfaces of the catalytic holes and ensure the orderly catalytic reaction.
Description
Technical Field
The invention belongs to the technical field of catalyst preparation, and particularly relates to a tail gas purification device containing a three-way catalyst.
Background
The main pollutants of the exhaust gas of an automobile are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx), and the carbon monoxide and the hydrocarbons can be oxidized into carbon dioxide (CO 2) and water (H2O) and simultaneously the nitrogen oxides can be reduced into nitrogen (N2) by using a catalyst installed in an exhaust system to purify the exhaust gas, and the catalyst is generally called a three-way catalyst. The three-way catalyst consists of two parts: a ceramic or metal support in the form of a honeycomb and a catalyst coating attached to the support. The catalyst coating layer is generally composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a precious metal active component (often one or more of Pd (palladium), rh (rhodium)) dispersed on the surface of the oxide or oxygen storage material. The oxygen storage material is a composite oxide containing cerium and zirconium, and the oxygen storage material can be used for adsorbing and storing oxygen in the tail gas or releasing oxygen to adjust the proportion of an oxidizing component and a reducing component in the tail gas, so that carbon monoxide and hydrocarbon are oxidized and oxynitride is reduced. In order to improve the conversion efficiency of pollutants during the cold start of an automobile, the three-way catalyst is usually arranged at a position close to the outlet of an exhaust manifold of an engine, and the bed temperature of the three-way catalyst can reach the high temperature of 900-1050 ℃ when the automobile runs at high speed.
However, when the catalytic converter used by the three-way catalyst in the prior art is used specifically, the catalyst is very sensitive to elements such as sulfur, lead, phosphorus, zinc and the like, the sulfur and the lead are from gasoline, the phosphorus and the zinc are from lubricating oil, the four substances and oxide particles formed by the four substances after the four substances are combusted in an engine are easily adsorbed on the surface of the catalyst, so that the catalyst cannot be contacted with exhaust gas, and the catalytic action, namely the poisoning phenomenon, is lost.
Disclosure of Invention
In order to make up for the defects of the prior art and solve the problem that the catalytic converter is reduced in efficiency because oxides and soot are easily adsorbed on the surface of a catalyst when the catalytic converter is in use, the invention provides the tail gas purification device containing the three-way catalyst.
The technical scheme adopted by the invention for solving the technical problem is as follows: the invention relates to a tail gas purification device containing a three-way catalyst, and a preparation method of the tail gas purification device comprises the following steps:
s1: cordierite powder is used for constructing a honeycomb carrier, and the cordierite ceramic honeycomb filter core is obtained after high-temperature firing;
s2: 30wt% of 50g of cerium-zirconium solid solution 2 、60wt％ZrO 2 、5wt％La 2 O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of the palladium nitrate solution, 6.90g of palladium nitrate solution, the Pd content in the solution is 14.5wt% and a proper amount of deionized water are mixed, and coating slurry is prepared after ball milling; coating the coating slurry on a filter element, and roasting at 550 ℃ for 2 hours to obtain a lower Pd coating;
s3: 30wt% of 50g of cerium-zirconium solid solution 2 、60wt％ZrO 2 、5wt％La 2 O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of the obtained solution and 2.00g of rhodium nitrate solution, wherein the Rh content in the solution is 5.0wt% and a proper amount of deionized water are mixed, and the mixture is subjected to ball milling to prepare coating slurry; coating the coating slurry on the filter element treated by S1, and roasting at 550 ℃ for 2 hours to obtain a middle layer Rh coating;
s4: with Ba (CH) 3 COO) 2 PVP preparation of Ba (CH) with BaO content of 5wt% 3 COO) 2 An aqueous solution, 100g of which is coated on the filter element treated by S2 and is roasted for 2 hours at the temperature of 550 ℃, so as to obtain an alkaline earth metal oxide coating with the BaO coating amount of 5 g/L;
s5: loading the filter element which is coated and dried by the three layers into a tail gas processor to obtain a finished product tail gas purification device;
the tail gas purification device in the S5 comprises a filter element, a shell and a vent pipe; the vent pipe is arranged on two sides of the shell and used for inputting and discharging tail gas; the shell is designed to be hollow; the filter element is arranged in the inner cavity of the shell; the filter element is provided with catalytic holes which are uniformly distributed; the catalytic pore spiral channel design; the bottom of the shell is fixedly connected with a circulating pipe; the circulating pipe is hollow and is communicated with the inner cavity of the shell; a plurality of cleaning balls are loaded in the circulating pipe in the initial state; the surface of the cleaning ball is designed to be uneven; a filter screen is fixedly connected between the shell and the right side vent pipe;
when the automobile tail gas purifying device works, automobile tail gas is introduced into the shell through the left vent pipe, the tail gas introduced into the shell enters the filter element and enters the right vent pipe through the catalytic hole to be discharged, part of the tail gas enters the circulating pipe while being discharged, the cleaning ball in the circulating pipe is driven to enter the filter element through the pipeline, the cleaning ball falls into the lower circulating pipe at the right vent pipe after passing through the filter element by being intercepted by the filter screen, and then is recycled, the tail gas fully reacts with the PD coating, the RH coating and the alkaline earth metal oxide coating coated on the spiral hole surface of the filter element when passing through the filter element, carbon monoxide (CO), hydrocarbon (HC) and oxynitride (NOx) contained in the tail gas are fully oxidized and reduced into carbon dioxide, water and nitrogen, the air pollutant contained in the tail gas is effectively purified, and meanwhile, the spiral design of the catalytic hole can increase the surface area of the catalytic hole, the tail gas entering the catalytic pore fully reacts to prevent harmful gas in the tail gas from contacting the coating on the surface of the catalytic pore to cause incomplete purification, meanwhile, when the tail gas passes through the catalytic pore, carbon particles, adhesive oxides and the like contained in the tail gas are extremely easy to adhere to the surface of the catalytic pore to cover the coating on the surface of the catalytic pore to ensure that the catalytic reaction is not thorough, the cleaning ball is impacted on the wall of the catalytic pore by the power generated when the tail gas circulates by the arrangement of the cleaning ball, so that the uneven surface of the cleaning ball is rubbed with the wall of the catalytic pore to ensure that impurities adhered on the wall of the catalytic pore fall off, the catalytic reaction is more thorough, and meanwhile, the uneven surface of the cleaning ball is designed to reduce the resistance of air and increase the lifting force of the cleaning ball so that when the cleaning ball is blown by airflow in the circulating pipe, possess faster impact velocity, make cleaning ball and catalysis pore wall frictional force increase, make the cleaning work go on more thoroughly.
Preferably, the inner cavity of the cleaning ball is arranged and filled with light inert gas; the cleaning ball is made of high-temperature resistant elastic rubber material; during operation, automobile exhaust passes through the breather pipe and gets into in the casing, the heat that the tail gas contains heats casing and filter core, high temperature air current makes light inert gas thermal expansion in the clean ball simultaneously, make clean ball surface area increase, make clean ball and catalysis pore wall area of contact increase, strengthen the ability that clean ball clearance catalysis pore surface impurity, make catalytic reaction go on more thoroughly, make the harmful gas content that contains in the automobile exhaust of output lower, when clean ball gets into the circulating pipe simultaneously, the temperature slowly reduces, the gaseous shrink gradually of inflation, clean ball is along with the shrink, when clean ball shrink, the impurity that clean ball surface is stained with adheres to drops, make clean ball self keep clean state, clean ball makes and can also avoid the clean ball striking damage catalytic coating when catalyzing on the pore wall for elastic rubber material simultaneously.
Preferably, the right side of the ventilation pipe is fixedly connected with a first wind wheel through a guide rod; the air pipe is positioned below the first wind wheel and fixedly connected with an air box; the air box is arranged in a hollow manner and is communicated with the vent pipe; a second wind wheel is rotationally connected in the wind box; the first wind wheel and the second wind wheel are both composed of fan blades and a gear ring; the fan blades are fixedly connected to the inner side of the gear ring; the two gear rings are mutually meshed; one side of the air box, which is close to the circulating pipe, is fixedly connected with a ventilating pipe which is communicated with the circulating pipe; the surface of one side of the air box, which is far away from the circulating pipe, is provided with openings uniformly; during operation, when tail gas is discharged through the right side breather pipe, the flabellum on the air current drives first wind wheel and rotates, thereby drive first wind wheel and rotate, transmission through intermeshing's ring gear, second wind wheel antiport, antiport second wind wheel passes through the ventilation pipe with the air current and inputs in the circulating line, play effect with higher speed to the air current in the circulating line, the thrust that makes the cleaning ball receive is bigger, strengthen the friction effect of cleaning ball, the air current that the second wind wheel was bloated simultaneously is the external air current that bellows one side opening was gushed into, external air current temperature is less than the tail gas temperature, can effectively cool down the processing to the cleaning ball, make cleaning ball self edulcoration ability go on more smoothly, the air current can also cool down the device wholly simultaneously, avoid under the condition that tail gas lasts the heating, ceramic filter core temperature is too high, make the downthehole coating of catalysis receive and last high temperature toast, produce phenomenons such as peeling off, avoid filter core's purifying effect to reduce, device wholeness descends.
Preferably, the lower surface of the circulating pipe is provided with an opening; a filter box is arranged at the opening of the circulating pipe; the filter box is designed to be close to an opening on one side of the circulating pipe; the inner wall of the filter box close to the opening is provided with a chute; the filter box is fixedly connected with a first interception net above the sliding chute; a second interception net is connected in the sliding groove in a sliding manner; when meshes of the first interception net and the second interception net are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls, and when the meshes of the first interception net and the second interception net are overlapped, the diameter of the meshes is larger than that of the cleaning balls; when the cleaning ball cleaning device works, when the filter box is loaded on the lower surface of the circulating pipe, the meshes of the first intercepting net and the second intercepting net are staggered, so that the cleaning ball can be effectively prevented from entering the filter box and simultaneously effectively collecting impurities such as carbon particles and adhesive oxides falling into the circulating pipe along with the cleaning ball, meanwhile, when the cleaning ball is used for a long time, the surface of the cleaning ball can be contaminated by the impurities which are difficult to clean, at the moment, the second intercepting net in the chute slides to enable the meshes of the second intercepting net to coincide with the meshes of the first intercepting net, so that the cleaning ball falls into the filter box, the filter box is taken down, the meshes of the second filter screen are staggered with the meshes of the first intercepting net again, a high-pressure water gun is used for flushing water into the filter box to complete the cleaning work of the cleaning ball and the filter box, the arrangement of the adjustable and controllable meshes of the double-layer intercepting nets enables the cleaning work to be easier, inconvenience in cleaning of the cleaning ball is avoided, meanwhile, the first intercepting net and the meshes of the second intercepting net coincide with the meshes of the cleaning ball when the cleaning ball is loaded, and the cleaning ball is automatically fed into the circulating pipe under the drive of wind in the circulating pipe, so that the cleaning ball can be cleaned and the cleaning and the loading is smoother.
Preferably, the inner wall of the circulating pipe is fixedly connected with impact plates which are uniformly arranged; the impact plates are designed in an inclined mode, and the multiple impact plates are arranged in a staggered mode; the impact plate is made of elastic metal material; the during operation, the continuous reciprocating motion that circulates in circulation pipe and casing is down driven to the cleaning ball at the air current, when the cleaning ball moved in the circulation pipe, evenly distributed's striking board can effectively intercept the cleaning ball, make cleaning ball and metal sheet take place the striking, make the cleaning ball vibrate, be stained with the impurity that attaches on the cleaning ball surface and shake down, can effectively strengthen the clean effect of cleaning ball, simultaneously the setting of striking board can also avoid the impurity that gets into together in the circulation pipe with the cleaning ball under the drive of air current directly not get into the filter core again through the filter screen, make the filter core contaminated once more.
Preferably, the right side surface of the impact plate is uniformly designed with convex points; the during operation, striking plate surface bump design when can effectively making clean ball and striking plate strike, reinforcing striking effect makes the more thorough that clean ball surface impurity drops, makes the device wholeness more superior, and the bump design makes the impact force dispersion of clean ball and striking plate simultaneously, avoids striking plate atress to damage.
The invention has the following beneficial effects:
1. according to the tail gas purification device containing the three-way catalyst, the circulating pipe, the cleaning ball and the catalytic hole are arranged, the cleaning ball circularly reciprocates in the circulating pipe and the catalytic hole of the filter element to generate friction with the catalytic hole wall, so that oxides and carbon smoke adhered to the catalytic hole wall are cleaned, the purification effect of the tail gas purification device is enhanced, meanwhile, through the transmission between the first wind wheel and the second wind wheel, the second wind wheel blows air into the circulating pipe by utilizing the airflow impulsive force when the tail gas is discharged, the overall temperature of the device is reduced, and the device performance is more excellent.
2. According to the tail gas purification device containing the three-way catalyst, the impact plate, the filter box and the double-layer intercepting net are arranged, so that the cleaning balls are impacted and vibrated when circulating in the circulating pipe, impurities attached to the surfaces of the cleaning balls are enabled to fall off, meanwhile, the filter box is used for collecting, and meanwhile, the meshes of the double-layer intercepting net are controllable, so that the meshes can be adjusted when needed, and therefore the cleaning and loading of the cleaning balls are enabled to be more convenient and rapid.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a perspective view of an exhaust gas purifying device;
fig. 3 is a sectional view of an exhaust gas purifying device;
FIG. 4 is a perspective view of the filter cassette;
in the figure: the device comprises a filter element 1, a shell 2, a vent pipe 3, a catalytic hole 11, a circulating pipe 4, a cleaning ball 41, a filter screen 42, a wind box 5, a guide rod 51, a first wind wheel 52, a second wind wheel 53, fan blades 54, a gear ring 55, a vent pipe 56, a filter box 6, a chute 7, a first interception net 71, a second interception net 72 and an impact plate 8.
Detailed Description
The present invention will be further described with reference to the following detailed description so that the technical means, the creation features, the achievement purposes and the effects of the present invention can be easily understood.
As shown in fig. 1 to 4, the preparation method of the exhaust gas purifying device containing a three-way catalyst according to the present invention includes the following steps:
s1: cordierite powder is used for constructing a honeycomb carrier, and the cordierite ceramic honeycomb filter core is obtained after high-temperature firing;
s2: 30wt% of 50g of cerium-zirconium solid solution 2 、60wt％ZrO 2 、5wt％La2O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of Pd and 6.90g of palladium nitrate solution, wherein the Pd content in the solution is 14.5wt% and a proper amount of deionized water are mixed, and the mixture is ball-milled to prepare coating slurry; coating the coating slurry on a filter element, and roasting at 550 ℃ for 2 hours to obtain a lower Pd coating;
s3: 30wt% of 50g of cerium-zirconium solid solution 2 、60wt％ZrO 2 、5wt％La 2 O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of the obtained solution and 2.00g of rhodium nitrate solution, wherein the Rh content in the solution is 5.0wt% and a proper amount of deionized water are mixed, and the mixture is subjected to ball milling to prepare coating slurry; coating the coating slurry on the filter element treated by S1, and roasting at 550 ℃ for 2 hours to obtain a middle layer Rh coating;
s4: with Ba (CH) 3 COO) 2 PVP preparation of Ba (CH) with BaO content of 5wt% 3 COO) 2 Aqueous solution, 100g of which is applied at S2Roasting the treated filter element for 2 hours at the temperature of 550 ℃ to obtain an alkaline earth metal oxide coating with BaO coating amount of 5 g/L;
s5: loading the filter element which is coated and dried by the three layers into a tail gas processor to obtain a finished product tail gas purification device;
the tail gas purification device in the S5 comprises a filter element 1, a shell 2 and a vent pipe 3; the vent pipe 3 is arranged on two sides of the shell 2 and used for inputting and discharging tail gas; the housing 2 is hollow; the filter element 1 is arranged in the inner cavity of the shell 2; the filter element 1 is provided with uniformly distributed catalytic holes 11; the catalytic hole 11 is designed as a spiral channel; the bottom of the shell 2 is fixedly connected with a circulating pipe 4; the circulating pipe 4 is hollow and the circulating pipe 4 is communicated with the inner cavity of the shell 2; a plurality of cleaning balls 41 are loaded in the circulating pipe 4 in the initial state; the surface of the cleaning ball 41 is designed to be uneven; a filter screen 42 is fixedly connected between the shell 2 and the right side vent pipe 3;
when the automobile exhaust purification device works, automobile exhaust is introduced into the shell 2 through the left side vent pipe 3, the exhaust introduced into the shell 2 enters the filter element 1 and enters the right side vent pipe 3 through the catalytic hole 11 to be discharged, part of the exhaust enters the circulating pipe 4 while the exhaust is discharged, the cleaning ball 41 in the circulating pipe 4 is driven to enter the filter element 1 through a pipeline, the cleaning ball 41 passes through the filter element 1 along with the exhaust and then falls into the lower circulating pipe 4 at the position of the right side vent pipe 3 by being intercepted by the filter screen 42, the recirculation operation is carried out, the exhaust fully reacts with the PD coating, the RH coating and the alkaline earth metal oxide coating coated on the spiral hole surface of the filter element 1 when passing through the filter element 1, carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide (NOx) contained in the exhaust are fully oxidized and reduced into carbon dioxide, water and nitrogen, and air pollutants contained in the exhaust are effectively purified, meanwhile, the spiral design of the catalytic hole 11 can increase the surface area of the catalytic hole 11, so that the tail gas entering the catalytic hole 11 can fully react, harmful gas in the tail gas is prevented from contacting a coating on the surface of the catalytic hole 11, incomplete purification is caused, meanwhile, when the tail gas passes through the catalytic hole 11, carbon particles, adhesive oxides and the like contained in the tail gas are extremely easily attached to the surface of the catalytic hole 11, the coating on the surface of the catalytic hole 11 is covered, the catalytic reaction is not completely carried out, the cleaning ball 41 is impacted on the wall of the catalytic hole 11 by the power generated when the tail gas circulates, the uneven surface of the cleaning ball 41 is rubbed with the wall of the catalytic hole 11, the adhered impurities on the wall of the catalytic hole 11 fall off, the catalytic reaction is carried out more completely, meanwhile, the uneven design of the surface of the cleaning ball 41 can reduce the resistance of air, the lifting force of the cleaning balls 41 is increased, so that the cleaning balls 41 have higher impact speed when being blown by airflow in the circulating pipe 4, the friction force between the cleaning balls 41 and the wall of the catalytic hole 11 is increased, and the cleaning work is more thorough.
As an embodiment of the invention, the inner cavity of the cleaning ball 41 is arranged and the inner cavity of the cleaning ball 41 is filled with light inert gas; the cleaning ball 41 is made of high-temperature resistant elastic rubber material; during operation, automobile exhaust passes through breather pipe 3 and gets into in casing 2, the heat that the tail gas contains heats casing 2 and filter core 1, high temperature air current makes light inert gas thermal expansion in clean ball 41 simultaneously, make clean ball 41 surface area increase, make clean ball 41 and the increase of catalysis hole 11 wall area of contact, strengthen clean ball 41 ability of clearing up catalysis hole 11 surface impurity, make catalytic reaction go on more thoroughly, make the harmful gas content that contains in the automobile exhaust of output lower, when clean ball 41 gets into circulating pipe 4 simultaneously, the temperature slowly reduces, the gaseous shrink of inflation gradually, clean ball 41 is along with the shrink, when clean ball 41 shrinks, the impurity that clean ball 41 surface is stained with drops, make clean ball 41 self keep clean state, clean ball 41 makes for elastic rubber material can also avoid clean ball 41 damage catalytic coating when striking on catalysis hole 11 wall simultaneously.
As an embodiment of the present invention, a first wind wheel 52 is fixedly connected to the right side of the ventilation pipe 3 through a guide rod 51; the air pipe 3 is fixedly connected with an air box 5 below the first wind wheel 52; the air box 5 is arranged in a hollow manner and is communicated with the vent pipe 3; a second wind wheel 53 is rotationally connected in the wind box 5; the first wind wheel 52 and the second wind wheel 53 are both composed of fan blades 54 and a gear ring 55; the fan blades 54 are fixedly connected to the inner side of the gear ring 55; the two gear rings 55 are mutually engaged; a vent pipe 56 is fixedly connected to one side of the air box 5 close to the circulating pipe 4, and the vent pipe 56 is communicated with the circulating pipe 4; the air box 5 is uniformly opened on the surface of one side away from the circulating pipe 4; in operation, when tail gas is discharged through the right-side vent pipe 3, the airflow drives the fan blades 54 on the first wind wheel 52 to rotate, thereby driving the first wind wheel 52 to rotate, through the transmission of the gear ring 55 engaged with each other, the second wind wheel 53 rotates in reverse direction, the second wind wheel 53 rotating in reverse direction inputs the airflow into the circulating pipe 4 through the vent pipe 56, playing an acceleration effect on the airflow in the circulating pipe 4, making the thrust received by the cleaning ball 41 larger, and strengthening the friction effect of the cleaning ball 41, meanwhile, the airflow blown by the second wind wheel 53 is the external airflow flowing into the opening on one side of the wind box 5, the external airflow temperature is lower than the tail gas temperature, and thus effectively cooling the cleaning ball 41, so that the impurity removal capability of the cleaning ball 41 itself is smoother, and the airflow can also cool the whole device, and under the situation of continuous heating of the tail gas is avoided, the ceramic filter element 1 has too high temperature, so that the inner coating of the catalytic hole 11 is continuously baked at high temperature, and the phenomena such as peeling are generated, thereby avoiding the reduction of the purification effect of the filter element 1 and the overall performance of the device being reduced.
As an embodiment of the present invention, the lower surface of the circulation pipe 4 is provided with an opening; a filter box 6 is arranged at the opening of the circulating pipe 4; the filter box 6 is designed to be opened at one side close to the circulating pipe 4; the inner wall of the filter box 6 close to the opening is provided with a chute 7; a first interception net 71 is fixedly connected above the chute 7 of the filter box 6; a second interception net 72 is connected in the chute 7 in a sliding way; when meshes of the first interception net 71 and the second interception net 72 are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls 41, and when the meshes of the first interception net 71 and the second interception net 72 are overlapped, the diameter of the meshes is larger than that of the cleaning balls 41; when the cleaning ball cleaning device works, when the filter box 6 is loaded on the lower surface of the circulating pipe 4, meshes of the first interception net 71 and the second interception net 72 are staggered, so that impurities such as carbon particles and adhesive oxides falling into the circulating pipe 4 along with the cleaning ball 41 can be effectively collected while the cleaning ball 41 can be effectively prevented from entering the filter box 6, meanwhile, when the cleaning ball 41 is used for a long time, the surface of the cleaning ball 41 can be contaminated by impurities which are difficult to clean, at the moment, the second interception net 72 in the sliding groove 7 slides, meshes of the second interception net 72 are overlapped with meshes of the first interception net 71, so that the cleaning ball 41 falls into the filter box 6, the filter box 6 is taken down, meshes of the second filter screen 42 are staggered with meshes of the first interception net 71 again, the cleaning work of the cleaning ball 41 and the filter box 6 can be finished by flushing water into the filter box 6 by using a high-pressure water gun, the cleaning work of the cleaning ball 41 and the filter box 6 can be carried out more easily due to the arrangement of the adjustable meshes of the double-layer interception nets, inconvenience when the cleaning ball 41 is loaded, and the cleaning ball 41 can enter the circulating pipe 4 more smoothly under the driving of wind power, so that the cleaning ball can be cleaned more smoothly.
As an embodiment of the invention, the inner wall of the circulating pipe 4 is fixedly connected with impact plates 8 which are uniformly arranged; the impact plates 8 are designed in an inclined mode, and the multiple impact plates 8 are arranged in a staggered mode; the impact plate 8 is made of elastic metal material; when the cleaning ball device works, the cleaning balls 41 continuously and circularly reciprocate in the circulating pipe 4 and the shell 2 under the drive of air flow, when the cleaning balls 41 move in the circulating pipe 4, the uniformly distributed impact plates 8 can effectively intercept the cleaning balls 41, so that the cleaning balls 41 and the metal plate are impacted, the cleaning balls 41 vibrate, impurities attached to the surfaces of the cleaning balls 41 are vibrated, the cleaning effect of the cleaning balls 41 can be effectively enhanced, and meanwhile, the arrangement of the impact plates 8 can also prevent the impurities which enter the circulating pipe 4 together with the cleaning balls 41 from directly entering the filter core 1 again without passing through the filter screen 42 under the drive of the air flow, so that the filter core 1 is polluted again.
As an embodiment of the present invention, the right surface of the striking plate 8 is uniformly convex in design; during operation, 8 surperficial bump designs of striking plate can effectively make clean ball 41 and striking plate 8 when striking, reinforcing striking effect makes the more thorough that 41 surperficial impurity of clean ball drop, makes the device wholeness more superior, and the bump design makes clean ball 41 and 8 impact force dispersion of striking plate simultaneously, avoids 8 atress damages of striking plate.
The specific implementation flow is as follows:
when the automobile tail gas cleaning device works, automobile tail gas is introduced into the shell 2 through the left side vent pipe 3, the tail gas introduced into the shell 2 enters the filter core 1 and enters the right side vent pipe 3 through the catalytic hole 11 to be discharged, part of the tail gas enters the circulating pipe 4 while the tail gas is discharged, and the cleaning ball 41 in the circulating pipe 4 is driven to enter the filter core 1 through a pipeline, the cleaning ball 41 passes through the filter core 1 along with the tail gas and then is intercepted by the filter screen 42 at the right side vent pipe 3 and falls into the lower circulating pipe 4, meanwhile, when the tail gas is discharged through the right side vent pipe 3, the air flow drives the fan blades 54 on the first wind wheel 52 to rotate, the first wind wheel 52 is driven to rotate, the second wind wheel 53 rotates reversely, the air flow is input into the circulating pipe 4 through the air flow 56, the air flow in the circulating pipe 4 has an accelerating effect, the cleaning ball 41 is subjected to a larger thrust force, when the cleaning ball 41 moves in the circulating pipe 4, the cleaning ball 41 impacts the impact on the impact plates 8 which are uniformly arranged, so that the cleaning ball 41 vibrates, the impurities adhered to fall off on the surface of the cleaning ball 41, and the cleaning work is more thoroughly.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. An exhaust gas purification device containing a three-way catalyst, characterized in that the preparation method of the three-way catalyst comprises the following steps:
s1: cordierite powder is used for constructing a honeycomb carrier, and the cordierite ceramic honeycomb filter core is obtained after high-temperature firing;
s2: 30wt% of 50g of cerium-zirconium solid solution of CeO 2 、60wt％ZrO 2 、5wt％La 2 O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of the palladium nitrate solution, 6.90g of palladium nitrate solution, the Pd content in the solution is 14.5wt% and a proper amount of deionized water are mixed, and the mixture is prepared into a coating after ball millingSlurry; coating the coating slurry on a filter element, and roasting at 550 ℃ for 2 hours to obtain a lower Pd coating;
s3: 30wt% of 50g of cerium-zirconium solid solution 2 、60wt％ZrO 2 、5wt％La 2 O 3 And 5wt% of Y 2 O 3 50g of La 2 O 3 -Al 2 O 3 ，La 2 O 3 Occupy La 2 O 3 -Al 2 O 3 4wt% of the obtained solution and 2.00g of rhodium nitrate solution, wherein the Rh content in the solution is 5.0wt% and a proper amount of deionized water are mixed, and the mixture is subjected to ball milling to prepare coating slurry; coating the coating slurry on the filter element treated by S1, and roasting at 550 ℃ for 2 hours to obtain a middle layer Rh coating;
s4: with Ba (CH) 3 COO) 2 PVP preparation of Ba (CH) with BaO content of 5wt% 3 COO) 2 An aqueous solution, 100g of which is coated on the filter element treated by S2 and is roasted for 2 hours at the temperature of 550 ℃, so as to obtain an alkaline earth metal oxide coating with the BaO coating amount of 5 g/L;
s5: loading the filter element which is coated and dried by the three layers into a tail gas processor to obtain a finished product tail gas purification device;
the tail gas purification device in the S5 comprises a filter element (1), a shell (2) and a vent pipe (3); the vent pipe (3) is arranged on two sides of the shell (2) and used for inputting and discharging tail gas; the housing (2) is hollow; the filter element (1) is arranged in the inner cavity of the shell (2); the filter element (1) is provided with catalytic holes (11) which are uniformly distributed; the catalytic pore (11) is designed as a spiral channel; the bottom of the shell (2) is fixedly connected with a circulating pipe (4); the circulating pipe (4) is designed in a hollow mode, and the circulating pipe (4) is communicated with the inner cavity of the shell (2); a plurality of cleaning balls (41) are loaded in the circulating pipe (4) in an initial state; the surface of the cleaning ball (41) is designed to be uneven; a filter screen (42) is fixedly connected between the shell (2) and the right side vent pipe (3).
2. The exhaust gas purifying apparatus containing a three-way catalyst according to claim 1, characterized in that: the inner cavity of the cleaning ball (41) is arranged and filled with light inert gas; the cleaning ball (41) is made of high-temperature resistant elastic rubber materials.
3. The exhaust gas purifying apparatus containing a three-way catalyst according to claim 1, characterized in that: a first wind wheel (52) is fixedly connected in the right-side ventilating pipe (3) through a guide rod (51); the air pipe (3) is positioned below the first wind wheel (52) and is fixedly connected with an air box (5); the air box (5) is arranged in a hollow manner and is communicated with the vent pipe (3); a second wind wheel (53) is rotationally connected in the wind box (5); the first wind wheel (52) and the second wind wheel (53) are both composed of fan blades (54) and a gear ring (55); the fan blades (54) are fixedly connected to the inner side of the gear ring (55); the two gear rings (55) are mutually meshed; one side of the air box (5) close to the circulating pipe (4) is fixedly connected with a ventilating pipe (56), and the ventilating pipe (56) is communicated with the circulating pipe (4); the surface of one side of the air box (5) far away from the circulating pipe (4) is evenly opened.
4. The exhaust gas purifying apparatus containing a three-way catalyst according to claim 1, characterized in that: the lower surface of the circulating pipe (4) is provided with an opening; a filter box (6) is arranged at the opening of the circulating pipe (4); the filter box (6) is designed to be provided with an opening at one side close to the circulating pipe (4); a sliding groove (7) is formed in the inner wall of the filter box (6) close to the opening; the filter box (6) is positioned above the chute (7) and is fixedly connected with a first interception net (71); a second interception net (72) is connected in the sliding chute (7) in a sliding way; when meshes of the first interception net (71) and the second interception net (72) are staggered in an initial state, the diameter of the meshes is smaller than that of the cleaning balls (41), and when the meshes of the first interception net (71) and the second interception net (72) are overlapped, the diameter of the meshes is larger than that of the cleaning balls (41).
5. The exhaust gas purifying apparatus containing a three-way catalyst according to claim 1, characterized in that: the inner wall of the circulating pipe (4) is fixedly connected with impact plates (8) which are uniformly arranged; the impact plates (8) are designed in an inclined manner, and the multiple impact plates (8) are arranged in a staggered manner; the impact plate (8) is made of elastic metal material.
6. The exhaust gas purifying apparatus containing a three-way catalyst according to claim 5, characterized in that: the right side surface of the impact plate (8) is designed to be evenly convex.
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| CN113565607B (en) * | 2021-08-31 | 2022-06-03 | 吉林大学 | Anti-blocking structure of three-way catalytic converter |
| CN113565606B (en) * | 2021-08-31 | 2022-09-16 | 易典军 | Three-way catalyst for treating automobile exhaust |
| CN118079556B (en) * | 2024-04-29 | 2024-07-09 | 深圳市诚石环保科技有限公司 | Portable portable building dust filters collection device |
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| CN102849774A (en) * | 2012-01-10 | 2013-01-02 | 浙江理工大学 | Method for preparing nanometer cerium oxide by hydrothermal method |
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