CN212177261U

CN212177261U - Tightly coupled post processor of national six diesel engine

Info

Publication number: CN212177261U
Application number: CN202020334587.0U
Authority: CN
Inventors: 司英群; 王滨滨; 娄须宽; 王牧苏
Original assignee: Zhengzhou Jingyida Environmental Protection Technology Co ltd
Current assignee: Zhengzhou Jingyida Auto Parts Co Ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-12-18
Anticipated expiration: 2030-03-17

Abstract

The utility model provides a close-coupled post processor of a national six diesel engine, which comprises an air inlet component, a DOC component, a mixer component, an SCR component and an air outlet component which are connected in sequence; the mixer assembly comprises a cylinder, a mixer Z-shaped partition plate, a rotational flow blade pipe, a stainless steel wire winding net column assembly, a temperature sensor base, a nozzle seat and a nozzle seat supporting plate; the bottom of the swirl vane tube is welded with a stainless steel wire winding net post component, and the stainless steel wire winding net post component is welded on a hole in the middle of the Z-shaped partition plate of the mixer and is radially placed in the barrel. Utility model not only can guarantee urea solution and automobile exhaust intensive mixing, anti urea crystallization effect is showing, and owing to adopt tight coupling to arrange, the volume is less, can install in engine turbo charger exit, makes through blender and SCR air current temperature higher, easily catalytic reaction to solve the conventional low temperature that arranges to bring and discharge difficult problem up to standard, be particularly suitable for using on light car, passenger car.

Description

Tightly coupled post processor of national six diesel engine

Technical Field

The utility model belongs to the technical field of automobile-used engine exhaust emission purification technique and energy saving and consumption reduction, especially relate to a six diesel engine close coupling postprocessors in state.

Background

Most of the current technical routes of the national heavy diesel engine are formed by combining an oxidation catalyst unit (DOC)/a particle capture unit (DPF)/a selective catalytic reduction conversion unit (SCR) and an ammonia oxidation catalyst unit (ASC) in series, wherein the Selective Catalytic Reduction (SCR) needs urea for hydrolysis so as to convert nitrogen oxides in tail gas. Compared with the national fifth diesel engine after-treatment system, the urea solution is required to be sprayed into the tail gas in a larger amount, and the urea solution is required to have a better mixing effect. At present, a conventional postprocessor adopts a DOC + DPF + urea mixer + SCR + ASC mode, has a large volume, and is difficult to reach the standard due to low-temperature emission and adapt to the problems of narrow and small environments of chassis spaces of light vehicles and passenger vehicles. Therefore, it is necessary to develop a closely coupled post-processor to solve the problems of low temperature emission, urea crystallization and narrow chassis space.

Disclosure of Invention

The utility model provides a six diesel engine close coupling after-treatment wares in state, after this treater adopt DOC + blender + SCR close coupling structure, can cooperate DPF, SCR to use, satisfy six emissions in state. The utility model discloses not only can guarantee urea solution and automobile exhaust intensive mixing, anti urea crystallization effect is showing, and owing to adopt tight coupling to arrange, the volume is less, can install in engine turbo charger exit, makes through blender and SCR air current temperature higher, easily catalytic reaction to solve the conventional low temperature that arranges to bring and discharge difficult problem up to standard, be particularly suitable for using on light car, passenger car.

The utility model adopts the technical proposal that: the utility model provides a close-coupled post processor of a national six diesel engine, which comprises an air inlet component, a DOC component, a mixer component, an SCR component and an air outlet component, wherein the air inlet component, the DOC component, the mixer component, the SCR component and the air outlet component are connected in sequence; the mixer assembly comprises a cylinder, a mixer Z-shaped partition plate, a rotational flow blade pipe, a stainless steel wire winding net column assembly, a temperature sensor base, a nozzle seat and a nozzle seat supporting plate; the bottom of the swirl vane tube is welded with a stainless steel wire winding net post assembly, is welded on a hole in the middle of the Z-shaped partition plate of the mixer and is radially placed in the cylinder; the top of the cyclone vane tube is welded with a nozzle holder supporting base, the nozzle holder is welded on the nozzle holder supporting base, and the barrel is welded with a temperature sensor base.

Furthermore, a nitrogen-oxygen sensor base and a temperature sensor base are welded on the air inlet assembly.

Furthermore, a guide groove is formed in the front baffle plate of the Z-shaped baffle plate of the mixer at the air inlet end of the mixer, and the guide groove is square or circular.

Further, the front baffle and the rear baffle in the Z-shaped partition of the mixer are in a plane or an arc surface shape.

Furthermore, a fin is arranged on the diversion trench.

Further, the stainless steel wire wound net column component consists of an outer layer pipe and a stainless steel wire wound net column, and the outer layer pipe and the stainless steel wire wound net column are welded together by utilizing a brazing process.

The utility model discloses following beneficial effect has:

1. under the condition of urea injection dosage meeting the national emission requirement, the crystallization resistance is excellent, and the use requirement is met;

2. the exhaust back pressure is lower under the same engine exhaust flow, which is beneficial to the fuel economy of the whole vehicle;

3. the compact coupling arrangement is adopted, the size is small, the compact coupling type low-temperature catalytic converter can be arranged behind a turbocharger, the high catalytic temperature is kept, and the problem that low-temperature emission is difficult to reach the standard is solved;

4. the chassis is tightly coupled, has small volume, and can solve the problems of compact space and difficult arrangement of the chassis of light vehicles and passenger vehicles.

Drawings

FIG. 1 is an overall isometric view of a post-processor;

FIG. 2 is a general elevation view of the post-processor;

FIG. 3 is a schematic diagram of a first mixer;

FIG. 4 is a schematic diagram of a second mixer;

FIG. 5 is a schematic view of a stainless steel wire wrapped mesh column assembly;

in the figure: 101-inlet assembly, 102-nitrogen oxide sensor base, 103-temperature sensor base, 104-DOC assembly, 105-mixer assembly, 106-SCR assembly, 107-outlet assembly; 201-DOC catalytic unit, 202-SCR catalytic unit; 301-cylinder, 302-nozzle holder, 303-nozzle holder supporting base, 304-temperature sensor base, 305-swirl vane tube, 306-stainless steel wire winding net column component, 307-mixer Z-shaped partition plate, 308-diversion trench, 309-fin, 317-front baffle and 327-rear baffle; 501-outer layer pipe, 502-stainless steel wire winding net post.

Detailed Description

The invention is further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the utility model relates to a six diesel engine close-coupled postprocessors of state, including air inlet assembly 101, nitrogen oxygen sensor base 102, temperature sensor base 103, DOC subassembly 104, blender subassembly 105, SCR subassembly 106 and air outlet assembly 107; the components are cylindrical and are formed by sequentially connecting an air inlet component 101, a DOC component 104, a mixer component 105, an SCR component 106 and an air outlet component 107, wherein the air inlet component 101 is welded with a nitrogen-oxygen sensor base 102 and a temperature sensor base 103. When the airflow enters from the air inlet assembly 101, the airflow passes through the DOC assembly 104, the mixer assembly 105 and the SCR assembly 106 in sequence, and then flows out from the air outlet assembly 107.

As shown in FIG. 2, the DOC catalytic unit 201 is at the front end of the mixer assembly 105 and the SCR catalytic unit 202 is at the rear end of the mixer assembly 105.

As shown in fig. 3, the mixer assembly 105 includes a cylinder 301, a mixer zigzag partition 307, a swirl vane tube 305, a stainless steel wire-wound mesh column assembly 306, a temperature sensor base 304, a nozzle holder 302, and a nozzle holder support plate 303. The bottom of the swirl vane tube 305 is welded with a stainless steel wire winding net post component 306, and the stainless steel wire winding net post component is installed and welded on a hole in the middle of a Z-shaped partition plate 307 of the mixer to form a small assembly which is placed in the cylinder 301, the top of the swirl vane tube 305 is welded with a nozzle holder supporting base 303, a nozzle holder 302 is welded on the nozzle holder supporting base 303, and a temperature sensor base 304 is welded on the cylinder 301. The mixer zigzag partition 307 can partition the air flow entering the mixer, so that the air flow enters from the slotted section of the swirl vane tube 305, is mixed with the urea sprayed from the upper part, and flows out from the stainless steel wire wound mesh column component 306 at the lower part to enter the SCR catalytic unit 202. The mixer zigzag partition 307 is provided with a guide groove 308 on a front baffle 317 at the air inlet end of the mixer, and the guide groove 308 is provided with fins 309 which can guide a part of air flow to directly blow to the stainless steel wire winding net post component 306, and the air flow is mixed with the air flowing out of the stainless steel wire winding net post component 306 and then flows into the rear SCR catalytic unit.

As shown in fig. 4, the mixer Z-shaped partition plate plays a role of separating and guiding the air flow, the front baffle 317 and the rear baffle 327 are not limited to be flat, and can be adjusted to be arc surfaces or other shapes, the guiding groove is not limited to use of the fin 309, and also can use round holes or other shapes, as long as the concept and scope of the technical solution of the present invention are not exceeded, all should be included in the scope of the claims of the present invention.

As shown in fig. 5, the stainless steel wire-wound mesh column assembly includes an outer tube 501 and a stainless steel wire-wound mesh column 502, which are welded together using a brazing process. When the mixed gas of urea and tail gas in the swirl vane tube passes through the 502 stainless steel wire winding net post, the stainless steel wire winding net post can be heated, and high temperature makes the urea solution hydrolyze fast and then become ammonia, and the ammonia is fully mixed with the tail gas, thereby being beneficial to the subsequent catalytic reaction.

It should be noted that the above-mentioned embodiments are illustrative and not restrictive of the technical solutions of the present invention, and equivalents of those skilled in the art or other modifications made according to the prior art are intended to be included within the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a six diesel engine close coupling aftertreatment ware in state, includes air intake component, DOC subassembly, blender subassembly, SCR subassembly and the subassembly of giving vent to anger, its characterized in that: the air inlet assembly, the DOC assembly, the mixer assembly, the SCR assembly and the air outlet assembly are sequentially connected; the mixer assembly comprises a cylinder, a mixer Z-shaped partition plate, a rotational flow blade pipe, a stainless steel wire winding net column assembly, a temperature sensor base, a nozzle seat and a nozzle seat supporting plate; the bottom of the swirl vane tube is welded with a stainless steel wire winding net post assembly, is welded on a hole in the middle of the Z-shaped partition plate of the mixer and is radially placed in the cylinder; the top of the cyclone vane tube is welded with a nozzle holder supporting base, the nozzle holder is welded on the nozzle holder supporting base, and the barrel is welded with a temperature sensor base.

2. The tightly coupled post-processor of a national six diesel engine according to claim 1, wherein: and the air inlet assembly is welded with a nitrogen-oxygen sensor base and a temperature sensor base.

3. The tightly coupled post-processor of a national six diesel engine according to claim 1, wherein: the Z-shaped baffle plate of the mixer is provided with a diversion trench on a front baffle plate at the air inlet end of the mixer, and the diversion trench is square or circular.

4. The tightly coupled post-processor of a national six diesel engine according to claim 1, wherein: the front baffle and the rear baffle in the Z-shaped baffle of the mixer are in a plane or an arc surface shape.

5. The tightly coupled post-processor of a national six diesel engine according to claim 3, wherein: and the flow guide groove is provided with a fin.

6. The tightly coupled post-processor of a national six diesel engine according to claim 1, wherein: the stainless steel wire wound net column component consists of an outer layer pipe and a stainless steel wire wound net column, and the outer layer pipe and the stainless steel wire wound net column are welded together by utilizing a brazing process.