CN219317033U

CN219317033U - Tightly coupled SCR post-processor

Info

Publication number: CN219317033U
Application number: CN202320469565.9U
Authority: CN
Inventors: 许二丰; 赵宜斌; 王滨滨; 王牧苏
Original assignee: Zhengzhou Jingyida Auto Parts Co Ltd
Current assignee: Zhengzhou Jingyida Auto Parts Co Ltd
Priority date: 2023-03-13
Filing date: 2023-03-13
Publication date: 2023-07-07
Anticipated expiration: 2033-03-13

Abstract

The utility model provides a tightly coupled SCR post-processor, which is characterized in that: the device comprises an air inlet end cover assembly, a mixer assembly, an SCR air outlet assembly and a throttle valve which are sequentially connected in series; the air inlet end cover assembly, the mixer assembly and the SCR air outlet assembly are connected through V-shaped hoops, and the SCR air outlet assembly is connected with the throttle valve through bolts; the mixer assembly comprises a mixer barrel, a mixing cavity and a urea nozzle. The utility model provides the post-processor which has compact structure, can fully utilize exhaust high temperature and turbine turbulent gas and solves the problem of low temperature NOx emission.

Description

Tightly coupled SCR post-processor

Technical Field

The utility model belongs to the technical field of tail gas emission purification technology and energy conservation and consumption reduction of an automobile engine, and particularly relates to a tightly coupled SCR post-processor.

Background

At present, six emission regulations are fully implemented, the main technical route of exhaust treatment of a diesel engine is DOC+DPF+SCR+ASC, the technical route can well solve the NOx emission above 200 ℃, but the NOx emission during low-temperature cold start cannot be well treated, the NOx standard is always tightened by seven emissions in the future, the current route cannot meet the requirements, and therefore, a tightly coupled SCR post-processor needs to be developed for solving the problem of low-temperature NOx emission.

Disclosure of Invention

The utility model provides a tightly coupled SCR post-processor, which aims to provide a post-processor which has a compact structure, can fully utilize exhaust high temperature and turbine turbulent flow gas and solves the problem of low temperature NOx emission.

The utility model adopts the technical scheme that:

a tightly coupled SCR post-processor comprises an air inlet end cover assembly, a mixer assembly, an SCR air outlet assembly and a throttle valve which are sequentially connected in series; the air inlet end cover assembly, the mixer assembly and the SCR air outlet assembly are connected through V-shaped hoops, and the SCR air outlet assembly is connected with the throttle valve through bolts;

the mixer assembly comprises a mixer barrel, a mixing cavity and a urea nozzle;

a front temperature sensor base, a front nitrogen-oxygen sensor base and a urea nozzle base are fixed on the mixer cylinder body, and the urea nozzle is fixed on the mixer cylinder body through the base; the mixing cavity is welded inside the mixer barrel;

the mixing cavity comprises an air inlet baffle plate, a supporting plate, a cyclone tube and a rear spoiler;

the front end and the rear end of the supporting plate are respectively connected to the air inlet baffle plate and the rear spoiler, a through hole is formed in the supporting plate, and the cyclone tube is arranged on the through hole; the air inlet partition plate is a partition plate with the area smaller than the cross section of the inner cylinder of the mixer barrel; the two sides of the supporting plate extend downwards in a tilting way to guide the air flow; the swirl tube is a stainless steel tube, a plurality of through holes are distributed on the stainless steel tube, and the through holes are connected with the flared blades; the lower part of the rear spoiler is provided with a baffle plate with an air outlet groove.

Further, the air inlet end cover assembly is provided with a flange mounting hole, and the flange mounting hole is connected with the turbocharger through a bolt.

Further, the mixer assembly is of a double-layer heat insulation structure, and heat insulation materials are filled between the mixer heat shield on the outer side and the mixer cylinder on the inner side; the SCR air outlet assembly is of a double-layer heat preservation structure, and heat preservation materials are filled between the mixer heat shield on the outer side and the SCR GBD packaging assembly on the inner side.

Further, the SCR air outlet assembly is provided with a CCSCR carrier in a packaging mode, and the CCSCR carrier and an air outlet cone cover are welded to form the air outlet assembly, and a rear temperature sensor base is arranged on the cone cover.

Further, the mixer barrel is integrally formed by stamping, and the nozzle mounting base and the hump bell mouth connecting structure are integrated.

Further, the air inlet baffle plate, the supporting plate, the swirl tube and the rear spoiler of the mixing cavity are fixedly connected by welding or integrally formed by punching.

Further, a stainless steel winding net is arranged in the cyclone tube.

Advantageous effects

1. The exhaust gas high temperature and turbine turbulent flow gas can be fully utilized by being arranged close to the supercharger in a tight coupling way and directly connected with the turbocharger, the temperature of the front end of the SCR is improved, and the conversion of low-temperature NOx is facilitated;

2. the mixer is of a detachable structure, so that urea crystals in extreme conditions can be conveniently cleaned;

3. the mixing cavity in the mixer assembly can divide the airflow into three streams, so that the urea solution and the tail gas can be fully mixed, and the conversion efficiency is effectively improved;

4. the rear end of the post-processor is provided with a throttle valve, so that the exhaust temperature can be controlled, and further NOx can be converted more fully;

5. the structure is compact, the air inlet end is integrated with the flange structure, and the problem of insufficient installation space at the turbocharger is fully solved;

6. the three-section type arrangement has high modularization degree.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is an exploded view of the structure of the present utility model;

FIG. 3 is a schematic view of the air intake end cap assembly from the front perspective of the present utility model;

FIG. 4 is a schematic view of the rear view of the air intake end cap assembly of the present utility model;

FIG. 5 is a schematic view of a mixer assembly from a front perspective in accordance with the present utility model;

FIG. 6 is a schematic view of a rear view mixer assembly according to the present utility model;

FIG. 7 is a schematic view of a mixing chamber structure from a front view of the present utility model;

FIG. 8 is a schematic view of a rear view of a hybrid cavity according to the present utility model;

FIG. 9 is a schematic view of a mixer cartridge structure of the present utility model;

FIG. 10 is a schematic view of an SCR outlet assembly according to the present utility model;

the marks in the figure:

1: an air inlet end cover assembly; 2: a mixer assembly; 3: an SCR gas outlet assembly; 4: a throttle valve; 11: an air inlet eccentric connecting cover; 12: a horn mouth; 13: a flange reinforcing plate; 21: a mixing chamber; 22: a mixer barrel; 23: a front temperature sensor base; 24: a front nitroxide sensor base; 25: a urea nozzle base; 26: a urea nozzle; 27: a mixer heat shield; 211: an air intake partition; 212: a support plate; 213: swirl tube; 214: a rear spoiler; 31: a flange; 32: a cone cover; 33: a rear temperature sensor mount; 34: an SCR GBD packaging assembly; 35: an SCR heat shield; 36: hump tube.

Detailed Description

The utility model will be further described with reference to the drawings and the specific embodiments.

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art. In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.

As shown in fig. 1 and 2:

the utility model relates to a tightly coupled SCR post-processor, which comprises an air inlet end cover assembly 1, a mixer assembly 2, an SCR air outlet assembly 3 (SCR: selective catalytic reduction conversion unit) and a throttle valve 4. The whole structure is in linear arrangement, the air inlet end cover assembly 1, the mixer assembly 2 and the SCR air outlet assembly 3 are connected through V-shaped hoops, and the SCR air outlet assembly 3 is connected with the throttle valve 4 through bolts.

After exiting the turbocharger, the exhaust gas passes through the air inlet end cover assembly 1, is fully mixed with urea in the mixer assembly 2, then flows through the SCR air outlet assembly 3, undergoes chemical reaction in the SCR catalytic unit, and then flows out of the throttle valve 4. The throttle valve 4 can control the opening and closing degree of the butterfly valve through an electric control system so as to control the exhaust temperature, thereby improving the low-temperature conversion efficiency of NOx.

As shown in fig. 3 and 4:

the flange mounting holes are reserved in the air inlet eccentric connecting cover 11, the flange reinforcing plate 13 is welded on the inner side, the air inlet eccentric connecting cover 11 is connected with the bell mouth 12 through welding, the clamp can be taken down during actual mounting, bolts are used for tightening on the inner side, and the mounting space is saved; the air inlet end cover assembly 1 is directly connected with the turbocharger through a flange mounting hole by bolts.

As shown in fig. 5 and 6:

the mixer assembly 2 includes a mixing chamber 21, a mixer bowl 22, a front temperature sensor mount 23, a front nitrogen oxygen sensor mount 24, a urea nozzle mount 25, a urea nozzle 26, and a mixer heat shield 27.

The air flow is split after passing through the mixing cavity 21, and the mixing cavity 21 is welded inside the mixer barrel 22; the front temperature sensor base 23 and the front nitrogen-oxygen sensor base 24 are fixed on the outer side of the mixer cylinder 22 through welding; the urea nozzle base 25 is welded on a platform reserved for the mixer barrel 22; the urea nozzle 26 is fixed on the urea nozzle base 25 by bolts; the whole adopts a double-layer heat preservation structure, and heat preservation materials are filled between the outer mixer heat shield 27 and the inner mixer cylinder 22.

As shown in fig. 7 and 8:

the mixing chamber 21 includes an air inlet baffle 211, a support plate 212, a swirl tube 213, and a rear spoiler 214, and is manufactured by welding or integral stamping.

The front and rear ends of the support plate 212 are respectively connected to the air inlet baffle 211 and the rear spoiler 214, through holes are formed in the support plate 212, and the cyclone tube 213 is installed on the through holes;

the air inlet baffle 211 is a baffle with an area smaller than the cross section of the inner cylinder of the mixer drum 22, so the air inlet baffle 211 is a baffle for shielding a certain area of the mixer drum 22; the two sides of the support plate 212 extend downwards in a tilting way, and the two sides of the support plate 212 form a certain angle and can guide air flow downwards in a tilting way; swirl tube 213 is a stainless steel tube with a certain diameter, a certain number of through holes are distributed on the stainless steel tube, the through holes are connected with blades, and the blades are outwards stretched at a certain angle; stainless steel winding pipes can be added in the cyclone pipes 213 according to the requirements; the rear spoiler 214 is a partition plate with a shaped air outlet groove at the lower portion.

After passing through the air inlet partition 211, a part of the air flow passes through the through holes in the support plate 212 from the cyclone tube 213 from above, and a part of the air flow flows downwards at two sides of the support plate 212; finally, after the three airflows below the support plate 212 are mixed, the airflows flow out of the air outlet grooves from the slotting positions of the rear spoiler 214 and continue to be diffused.

As shown in fig. 9:

the mixer barrel 22 is integrated with a hump connection structure and a bell mouth structure, a sensor base mounting hole is reserved, a nozzle base mounting platform is reserved above the sensor base mounting hole through stamping forming, and the overall integration is high.

As shown in fig. 10:

the SCR outlet assembly 3 includes a flange 31, a cone cover 32, a rear temperature sensor mount 33, an SCR GBD packaging assembly 34, an SCR heat shield 35, and a hump tube 36. The whole adopts a double-layer heat preservation structure, and heat preservation materials are filled between the mixer heat shield 35 on the outer side and the SCR GBD packaging assembly 34 on the inner side. And the SCR air outlet assembly 3 is used for packaging a CCSCR carrier and welding the CCSCR carrier with the cone cover 32 to form an air outlet assembly, and the cone cover 32 is provided with a rear temperature sensor base 33.

The air flow is mixed at the front end and enters the SCR GBD packaging assembly 34 for chemical reaction and is discharged through the cone cover 32.

The tightly coupled SCR postprocessor is used for solving the problem of low-temperature NOx emission of a diesel engine. The processor is compact in structure, low in back pressure and integrated with the throttle valve, the exhaust temperature can be obviously improved, meanwhile, the detachable high-conversion-rate mixer is developed, the conversion efficiency of low-temperature NOx is greatly improved, and the NOx emission problem during cold start is solved.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tightly-coupled SCR aftertreatment device, characterized by: the device comprises an air inlet end cover assembly, a mixer assembly, an SCR air outlet assembly and a throttle valve which are sequentially connected in series; the air inlet end cover assembly, the mixer assembly and the SCR air outlet assembly are connected through V-shaped hoops, and the SCR air outlet assembly is connected with the throttle valve through bolts; the mixer assembly comprises a mixer barrel, a mixing cavity and a urea nozzle; a front temperature sensor base, a front nitrogen-oxygen sensor base and a urea nozzle base are fixed on the mixer cylinder body, and the urea nozzle is fixed on the mixer cylinder body through the base; the mixing cavity is welded inside the mixer barrel; the mixing cavity comprises an air inlet baffle plate, a supporting plate, a cyclone tube and a rear spoiler; the front end and the rear end of the supporting plate are respectively connected to the air inlet baffle plate and the rear spoiler, a through hole is formed in the supporting plate, and the cyclone tube is arranged on the through hole; the air inlet partition plate is a partition plate with the area smaller than the cross section of the inner cylinder of the mixer barrel; the two sides of the supporting plate extend downwards in a tilting way to guide the air flow; the swirl tube is a stainless steel tube, a plurality of through holes are distributed on the stainless steel tube, and the through holes are connected with the flared blades; the lower part of the rear spoiler is provided with a baffle plate with an air outlet groove.

2. A close-coupled SCR aftertreatment device according to claim 1, wherein: and the air inlet end cover assembly is provided with a flange mounting hole, and is connected with the turbocharger through bolts.

3. A close-coupled SCR aftertreatment device according to claim 1, wherein: the mixer assembly is of a double-layer heat preservation structure, and heat preservation materials are filled between the mixer heat shield on the outer side and the mixer cylinder on the inner side; the SCR air outlet assembly is of a double-layer heat preservation structure, and heat preservation materials are filled between the mixer heat shield on the outer side and the SCR GBD packaging assembly on the inner side.

4. A close-coupled SCR aftertreatment device according to claim 1, wherein: and the SCR air outlet assembly is formed by packaging the CCSCR carrier and welding an air outlet cone cover, and the cone cover is provided with a rear temperature sensor base.

5. A close-coupled SCR aftertreatment device according to claim 1, wherein: the mixer barrel is integrally formed by stamping, and the nozzle mounting base and the hump bell mouth connecting structure are integrated.

6. A close-coupled SCR aftertreatment device according to claim 1, wherein: the air inlet baffle plate, the supporting plate, the cyclone tube and the rear spoiler of the mixing cavity are fixedly connected by welding or integrally formed by stamping.

7. A close-coupled SCR aftertreatment device according to claim 1, wherein: a stainless steel winding net is arranged in the cyclone tube.