CN211500764U

CN211500764U - Metal foam catalytic purification silencer of automobile engine

Info

Publication number: CN211500764U
Application number: CN201922415554.9U
Authority: CN
Inventors: 刘柳成林; 刘光文; 杨晓桐; 孙强; 陈祥栋; 黎兆彩
Original assignee: Guangxi Brilliant Lang Jie Environmental Protection Technology Co ltd
Current assignee: Guangxi Brilliant Lang Jie Environmental Protection Technology Co ltd
Priority date: 2019-12-29
Filing date: 2019-12-29
Publication date: 2020-09-15
Anticipated expiration: 2029-12-29

Abstract

The utility model discloses a metal foam catalytic purification silencer of automobile engine, include and set gradually leading catalysis metal foam catalysis noise elimination board, 750 mesh metal honeycomb front end catalyst, CDPF,750 mesh metal honeycomb rear end catalyst, rearmounted metal foam catalysis noise elimination board by front end to rear end in the barrel. The utility model discloses with metal foam catalysis noise elimination board, 750 mesh metal honeycomb front end catalyst, CDPF,750 mesh metal honeycomb rear end catalyst, rearmounted metal foam catalysis noise elimination board has carried out scientific and reasonable's range and combination for discharge waste gas, harmful granule have all obtained effectual conversion and interception when the petrol engine starts to high-speed operation or even extremely fast operation from cold car low-speed, and the noise is also eliminated simultaneously, and the noise decibel is superior to national standard. Through the detection of exhaust gas detection test bench, when adopting every cubic foot 15 grams of noble metal, the utility model discloses exhaust gas catalytic conversion rate is more than 97%, and the exhaust gas catalytic conversion rate of every cubic foot of traditional structure is below 70%.

Description

Metal foam catalytic purification silencer of automobile engine

Technical Field

The utility model relates to a metal foam catalytic purification silencer of automobile engine, automobile engine refers to the engine that uses petrol, natural gas as fuel, belongs to automobile engine's catalytic silencer preparation technical field.

Background

With the improvement of the requirement of environmental protection, the emission standard of automobiles is gradually improved, the exhaust emission of the gasoline passenger vehicles at present is required to reach the emission standard of the national six, and the technical progress, upgrading and updating of the traditional catalytic purification muffler are required to be carried out to reach the emission standard of the national six. Traditional catalytic purification noise elimination system, constitute by the silencer of independent setting and the catalyst converter of independent setting, the silencer of use is trompil formula hush pipe, there are many noise elimination structures in the silencer, noise elimination pipe fitting and annex, because the sound wave is sharp propagation, the adoption is dislocation hole noise elimination, nevertheless do not reach 100% fender sharp sound wave, so this noise elimination effect needs many pipe fittings, many annex carry out sound and wind more and realize noise elimination effect, man-hour, the consumptive material is with high costs, also can not coat the catalyst, therefore, noise elimination effect is not good, the cost is higher. The used catalyst is prepared by coating a coating on a honeycomb ceramic carrier of American Corning and Japan NGK by German Pasteur, the domestic 600-mesh carrier is restricted by the bottleneck of manufacturing of die steel and dies, the wall thickness is unstable, and the domestic six-country catalyst is still tried in a small amount. It is recognized in the industry that the higher the mesh number of the metal honeycomb carrier, the higher the specific surface area, the higher the catalytic efficiency, and the higher the degree of conversion of exhaust gas. However, at present, the mesh number of the metal honeycomb carrier can only reach 600 meshes, the material for preparing the metal honeycomb carrier is an iron chromium aluminum flake, the mesh number of the metal honeycomb carrier is determined by the thickness of the iron chromium aluminum flake, the thinner flake thickness is, the higher the mesh number of the prepared metal honeycomb carrier is, at present, the thinner thickness of the prepared iron chromium aluminum flake can reach 0.05mm due to the restriction of equipment, the metal honeycomb carrier with 600 meshes can only be prepared by using the iron chromium aluminum flake with 0.05mm, and the preparation of the catalyst by using the metal honeycomb carrier with 600 meshes becomes the rule and the technical inertia which are generally established in the industry. At present, no report exists in China for preparing a catalyst by using a metal honeycomb carrier with more than 600 meshes, but because the technology for preparing the metal honeycomb carrier is a mature technology, the 750-mesh metal honeycomb carrier can be prepared only by solving the thickness problem of the iron-chromium-aluminum flake and reducing the thickness of the flake to 0.03mm, and the iron-chromium-aluminum flake with the thickness of 0.03mm can be produced abroad. The diameter of the experiment is 101mm, the length is 110mm, 20 grams of coated noble metal per cubic foot, one carrier with the wall thickness of 0.05mm and 600 meshes and one carrier with the wall thickness of 0.03mm are coated, a 1.4 liter engine produced by Liuzhou mechanical power company Limited is adopted to carry out emission detection experiments, the exhaust gas conversion rate of the metal honeycomb carrier with the wall thickness of 0.05mm and 600 meshes is 52.3 percent and the exhaust gas conversion rate of the metal honeycomb carrier with the wall thickness of 0.03mm and 750 meshes is 83.2 percent through an exhaust gas detection test bed, the consumption of the noble metal can be greatly reduced from the detection and emission data result, and the market competitiveness is promoted. Therefore, carry out technical innovation to traditional silencer and metal honeycomb carrier catalyst, provide a noise cancelling effect good, catalytic efficiency is high, and exhaust gas conversion degree is high, with low costs catalytic purification silencer, just be the utility model discloses a meaning place.

Disclosure of Invention

The utility model aims at providing a metal foam catalytic purification silencer of automobile engine, it is not good to overcome the noise cancelling effect that traditional catalytic purification silencer exists, and catalytic efficiency is low, and the exhaust gas conversion degree is low, and is with high costs not enough.

In order to achieve the above purpose, the utility model adopts the technical measures that: a metal foam catalytic purification silencer of an automobile engine comprises a cylinder body, an air inlet at the front end of the cylinder body and an air outlet at the rear end of the cylinder body, wherein a front catalytic metal foam catalytic silencing plate, a 750-mesh metal honeycomb front-end catalyst, a CDPF (continuous positive pressure Filter), a 750-mesh metal honeycomb rear-end catalyst and a rear metal foam catalytic silencing plate are sequentially arranged in the cylinder body from the front end to the rear end.

The thickness of the front metal foam catalytic noise elimination plate and the rear metal foam catalytic noise elimination plate is 5-40 cm, and the surfaces of the front metal foam catalytic noise elimination plate and the rear metal foam catalytic noise elimination plate are coated with catalyst coatings.

The 750-mesh metal honeycomb front-end catalyst is formed by coating a catalyst coating on a 750-mesh metal honeycomb carrier.

The CDPF carrier is coated with an oxidation catalyst coating.

The 750-mesh metal honeycomb back-end catalyst is formed by coating a three-way catalyst coating on a 750-mesh metal honeycomb carrier.

Take above-mentioned measure the utility model has the characteristics that:

1. the traditional silencer can not be coated with a catalyst coating, can only eliminate noise and can not catalyze, has single function, and at present, a gasoline passenger car does not adopt a structural design combining over-catalysis noise elimination into a whole, the utility model discloses a structure can eliminate noise and can also catalyze and purify, two functions are simultaneously embodied, 100% of linear sound wave is resisted, and simultaneously, the airflow is uniformly distributed after the airflow passes through metal foam, which is more favorable for improving the catalytic conversion rate;

2. in the technical field, the use of the 750-mesh metal honeycomb catalyst is still in a blank stage, and the utility model adopts the 750-mesh metal honeycomb catalyst, the heat conducting property and the exhaust temperature are synchronous, the catalytic efficiency is rapid, the specific surface area is high, the waste gas conversion rate is high, the consumption of noble metal is reduced, the catalyst has no thermal expansion and no mechanical damage, and has impact collision resistance, reduced cost, more reasonable cost performance and enhanced market competitiveness;

3. the DPF with the catalyst coating is adopted, the specific surface area of the DPF is fully utilized for oxidation and catalysis of the coating, carbon granules are oxidized, the use blocking time of the DPF is prolonged, the times of disassembly and maintenance are reduced, and the cylinder section of the device CDPF adopts a two-end hoop form, so that the carbon granules are conveniently disassembled and cleaned for maintenance;

4. the utility model discloses with metal foam catalysis noise elimination board, 750 mesh metal honeycomb front end catalyst, CDPF,750 mesh metal honeycomb rear end catalyst, rearmounted metal foam catalysis noise elimination board has carried out scientific and reasonable's range and combination for discharge waste gas, harmful granule have all obtained effectual conversion and interception when the petrol engine starts to high-speed operation or even extremely fast operation from cold car low-speed, the noise is also eliminated simultaneously, the noise decibel reduces, the noise decibel is superior to national standard. Detect through the exhaust gas detection test bench, when adopting every cubic foot of noble metal 15 grams, the utility model discloses a catalytic conversion rate advantage is obvious, the utility model discloses exhaust gas catalytic conversion rate more than 97%, and the exhaust gas catalytic conversion rate that traditional structure adopted every cubic foot is below 70%.

Drawings

FIG. 1 is a front view of the present invention;

figure 2 schematic diagram of the internal structure of the utility model

FIG. 3 is a front view of the U-shaped structure of the present invention;

figure 4 is a front view of the S-shaped structure of the present invention.

The reference numbers illustrate: the catalytic purification muffler comprises a catalytic purification muffler cylinder body 1, an air inlet 2, an air outlet 3, a front catalytic metal foam noise reduction plate 4, a 750-mesh metal honeycomb front-end catalyst 5, a CDPF6,750-mesh metal honeycomb rear-end catalyst 7, a rear catalytic metal foam noise reduction plate 8, a hoop 9 and an air pipe 10.

Detailed Description

The technical solution of the present invention will be further described with reference to the accompanying drawings.

Example 1

As shown in attached figures 1 and 2, the utility model comprises a cylinder body 1, an air inlet 2 at the front end of the cylinder body and an air outlet 3 at the rear end of the cylinder body, wherein a front metal foam catalysis sound-deadening plate 4, a metal honeycomb front-end catalyst 5 of 750 meshes, a CDPF6,750 metal honeycomb rear-end catalyst 7 and a rear metal foam sound-deadening plate 8 are sequentially arranged in the cylinder body 1 from the front end to the rear end. The thickness of the preposed metal foam catalytic noise elimination plate 4 is 5-40 cm, and the preposed metal foam catalytic noise elimination plate is formed by coating trace amount of composite catalyst slurry on the metal foam noise elimination plate. The main components of the composite catalyst are rare earth mixture and noble metal, and although there are various mixing ratios, its preparation and preparation method are known techniques, and are not limited in this example. The carrier water absorption of the metal foam noise elimination plate is 10-20%, the catalyst concentration of the catalyst slurry is 10-20%, the catalyst slurry is saturated and adsorbed by the metal foam noise elimination plate, then, the sintering is carried out according to the conventional technology, the catalyst forms a catalyst curing layer after the sintering, the curing layer is cured on the metal foam noise elimination plate to form the metal foam catalytic noise elimination plate, the metal foam catalytic noise elimination plate is installed at the front end to be the front metal foam catalytic noise elimination plate 4, the metal foam catalytic noise elimination plate is installed at the rear end to be the rear metal foam catalytic noise elimination plate 8, and the difference of the two is only the difference of the thickness.

The 750-mesh metal honeycomb front-end catalyst 5 is formed by coating a unitary catalyst coating on a 750-mesh metal honeycomb carrier. The 750-mesh metal honeycomb back-end catalyst 7 is formed by coating a three-way catalyst on a 750-mesh metal honeycomb carrier. The unitary catalyst refers to a catalyst prepared from only one noble metal of palladium, platinum and rhodium, the ternary catalyst refers to a catalyst prepared from three noble metals of palladium, platinum and rhodium, and the preparation and preparation methods thereof are known in the art and are not limited in the present embodiment. The application of a catalyst coating to a support is also known in the art and is likewise not limited in this example. The 750-mesh metal honeycomb carrier is prepared from an iron-chromium-aluminum flake with the thickness of 0.03 by a conventional method for preparing the metal honeycomb carrier. In the embodiment, the diameters of the front metal foam catalytic muffler plate 4, the 750-mesh metal honeycomb front-end catalyst 5, the CDPF6,750-mesh metal honeycomb rear-end catalyst 7 and the rear metal foam catalytic muffler plate 8 are based on the requirement of meeting the gas discharge capacity of the engine, the gas discharge capacities of the engines are different, the adopted specifications are different, the pore volume of the 750-mesh metal honeycomb catalyst must meet the maximum flow volume of the exhaust gas discharged by the engine, the larger the pore volume is, the larger the diameter of the 750-mesh metal honeycomb catalyst is, and in actual operation, the pore volume of the 750-mesh metal honeycomb catalyst is more than 120% of the highest dynamic value of the maximum flow volume of the exhaust gas discharged by the engine. The thickness of the 750-mesh metal honeycomb catalyst is selected according to the requirements of discharge capacity and catalytic performance, when the thickness is large, the time from the air inlet 2 to the air outlet 3 is long, otherwise, the time is short, but when the catalytic conversion rate of the waste gas reaches 100%, the fact that the thickness is large is not meaningful, so that the selection of the thickness of the 750-mesh metal honeycomb catalyst is based on cost performance, and the thickness of the 750-mesh metal honeycomb catalyst is determined according to the requirement of the catalytic conversion rate. The 750-mesh metal honeycomb catalyst comprises a 750-mesh metal honeycomb front-end catalyst 5 and a 750-mesh metal honeycomb rear-end catalyst 7.

The CDPF6, referred to herein as a catalyst coated particulate trap, is a conventional DPF, a diesel particulate filter, which is a device installed in the exhaust system of a diesel vehicle for reducing particulate matter in the exhaust by filtration. The original DPF becomes CDPF with oxidation catalysis performance by coating catalyst on DPF, which first oxidizes the black smoke particles in exhaust gas into tiny gas-like particles invisible to naked eyes through catalytic oxidation and intercepts. At the cylinder body where the CDPF6 is installed, the two cylinder bodies are clamped by the hoop 9 in a sleeving mode, and the CDPF6 is easily taken out to remove the intercepted particles when the hoop 9 is loosened.

The utility model discloses an operating condition is like this: at the gasoline engine during operation, waste gas gets into from air inlet 2 the utility model discloses in, at first through leading metal foam catalysis noise elimination board 4, sound is eliminated the majority here, waste gas has obtained preliminary catalytic conversion simultaneously, through 750 mesh metal honeycomb front end catalyst 5 subsequently, waste gas is further by catalytic conversion here, waste gas through further catalytic conversion gets into CDPF6 next, black smoke particle is turned into gaseous state particle and is intercepted here by catalytic oxidation, waste gas continues to get into in 750 mesh metal honeycomb rear end catalyst 7 along with it, waste gas is by complete catalytic conversion here, continue by rearmounted metal foam catalysis noise elimination board 8 noise elimination, the sound decibel reduces by a wide margin. The utility model discloses a catalytic purification silencer barrel 1 divide into two at the position that sets up CDPF 5 and cuts the installation to staple bolt 9 fastens, is convenient for like this take out because of the live time overlength CDPF 5 that is blockked up by small particle clears away impurity and maintains.

EXAMPLE 2

As shown in fig. 3, fig. 3 is another embodiment of the present invention, which is mainly configured according to the specific structural arrangement of the automobile engine, and this embodiment is to divide the catalytic purification muffler cylinder 1 into two independent cylinders, a front metal foam catalytic muffler plate 4, a front 750 mesh metal honeycomb catalyst 5 and a CDPF6 are disposed in the cylinder of the front cylinder, a rear 750 mesh metal honeycomb catalyst 7 and a rear metal foam catalytic muffler plate 8 are disposed in the rear cylinder, the front and rear cylinders are connected by an air pipe 10, the connection mode is welding or fastening by a hoop 9, and the front and rear cylinders form a U-shaped arrangement after connection. Except for the arrangement of the two cylinders, the working principle and the working state are the same as those of the embodiment 1.

Example 3

As shown in fig. 4, fig. 4 is another embodiment of the present invention, which is mainly configured according to the specific structural arrangement of the automobile engine, and this embodiment is to divide the catalytic purification muffler cylinder 1 into two independent cylinders, a front catalytic metal foam muffler plate 4, a front 750 mesh metal honeycomb catalyst 5 and a CDPF6 are disposed in the cylinder of the front cylinder, a rear 750 mesh metal honeycomb catalyst 7 and a rear metal foam catalyst muffler plate 8 are disposed in the rear cylinder, the front and rear cylinders are connected by an air pipe 10, the connection is performed by welding or fastening by an anchor ear 9, and the front and rear cylinders are connected to form an "S" shape arrangement. Except for the arrangement of the two cylinders, the working principle and the working state are the same as those of the embodiment 1.

Claims

1. The utility model provides a metal foam catalytic purification silencer of automobile engine, includes catalytic purification silencer barrel (1), air inlet (2) and exhaust port (3) of catalytic purification silencer barrel (1) rear end of catalytic purification silencer barrel (1) front end, characterized by has set gradually leading metal foam catalytic noise elimination board (4), 750 mesh metal honeycomb front end catalyst (5), CDPF (6), 750 mesh metal honeycomb rear end catalyst (7) and rearmounted metal foam catalytic noise elimination board (8) in catalytic purification silencer barrel (1) from the front end to the rear end.

2. The metal foam catalytic purification muffler of an automobile engine as set forth in claim 1, wherein the front metal foam catalytic muffler plate (4) and the rear metal foam catalytic muffler plate (8) have a thickness of 5-40 cm, respectively, and are coated with a thin catalyst coating on the surfaces thereof.

3. The metal foam catalytic purification muffler of automobile engine as set forth in claim 1, wherein said 750 mesh metal honeycomb front end catalyst (5) is formed by coating a unitary catalyst coating on a 750 mesh metal honeycomb carrier.

4. The metal foam catalytic purification muffler of an automobile engine as set forth in claim 1, wherein said 750 mesh metal honeycomb back end catalyst (7) is formed by coating a three-way catalyst coating on a 750 mesh metal honeycomb carrier.

5. The metal foam catalytic purification muffler for automobile engines as recited in claim 1 or 2, wherein the thin catalyst coating layer coated on the surface of the front metal foam catalytic muffler plate (4) and the rear metal foam catalytic muffler plate (8) is a cured layer formed by sintering after the metal foam muffler plates adsorb catalyst slurry having a catalyst concentration of 10 to 20% in saturation.

6. The metal foam catalytic purification muffler for automobile engines as recited in claim 3 or 4, wherein the 750 mesh metal honeycomb carrier is made of iron chromium aluminum thin sheet having a thickness of 0.03 mm.

7. The metal foam catalytic purification muffler for automobile engines as recited in claim 1, wherein the pore volumes of the 750 mesh metal honeycomb front end catalyst (5) and the 750 mesh metal honeycomb rear end catalyst (7) must respectively satisfy the maximum flow volumes of exhaust gas discharged from the engine, and the pore volumes of the 750 mesh metal honeycomb front end catalyst (5) and the 750 mesh metal honeycomb rear end catalyst (7) are respectively more than 120% of the maximum dynamic values of the maximum flow volumes of exhaust gas discharged from the engine.