CN213270018U

CN213270018U - Novel automobile exhaust aftertreatment system

Info

Publication number: CN213270018U
Application number: CN202021899480.7U
Authority: CN
Inventors: 刘飞锋; 聂晓龙; 王彬; 汪伟峰; 陈康
Original assignee: Jiangling Motors Corp Ltd
Current assignee: Jiangling Motors Corp Ltd
Priority date: 2020-09-03
Filing date: 2020-09-03
Publication date: 2021-05-25
Anticipated expiration: 2030-09-03

Abstract

The utility model provides a novel automobile exhaust aftertreatment system, including NSC barrel, urea mixer, SDPF barrel and urea nozzle, NSC barrel, urea mixer and SDPF barrel tightly couple together, whole similar U type structure of arranging to fix on the engine cylinder body through the NSC fixed bolster. The utility model aims at meeting the requirements of the national six b emission regulations, effectively shortening the distance between the after-treatment and the outlet of the engine supercharger, reducing the temperature loss of the tail gas entering the after-treatment by reasonably designing and arranging the parts such as the after-treatment, the mixer and the sensing device, improving the conversion performance of the after-treatment to the maximum extent and reducing the urea crystallization risk of the mixer; meanwhile, the gas taking length of the low-pressure EGR system is shortened, the gas taking efficiency of the low-pressure EGR is improved, the response time is shortened, and the emission of engine tail gas pollutants is effectively reduced.

Description

Novel automobile exhaust aftertreatment system

Technical Field

The utility model relates to an automobile exhaust aftertreatment technical field specifically is a novel automobile exhaust aftertreatment system.

Background

With the gradual implementation of the light automobile pollutant emission regulation in the sixth stage in China, the requirement on the limit value of the pollutant NOx emission is increasingly strict, especially the RDE requirement is increased in the sixth stage in China, the engine and the aftertreatment of the light diesel vehicle are greatly challenged, and the main technical route of the host factory at home and abroad at present is to increase a high-low pressure EGR system for the engine and reduce the NOx in the original exhaust of the engine. The aftertreatment adopts the NSC + SDPF + SCR technical route, namely NOx emission is catalytically converted through the NSC and a selective SCR catalyst, when the exhaust temperature is low, the NOx is firstly adsorbed through the NSC when the lambda is greater than 1, and then the NOx released by the NSC and CO are chemically reacted to generate N2 and CO2 when the lambda is less than 1. When the exhaust temperature is high, the NOx in the exhaust gas is reduced into N2 and water by spraying urea aqueous solution into the exhaust pipe and under the action of the SCR catalyst.

Six post-processing systems in state include: NSC catalyst, SDPF catalyst, SCR catalyst, urea mixer, temperature sensor, oxygen sensor, NOx sensor, oxygen sensor, temperature sensor, low pressure EGR system interface, etc. The overall aftertreatment system has a high number of components and requires the NSC and SDPF to be as close as possible to the turbocharger in order to improve the aftertreatment conversion efficiency, which greatly increases the overall aftertreatment system complexity. The utility model discloses a novel aftertreatment system scheme have solved above-mentioned problem, make whole aftertreatment performance obtain great improvement simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a novel automobile exhaust aftertreatment system, under the prerequisite that satisfies six b emission regulations requirements in the state, through spare parts such as reasonable close coupling design and arrangement aftertreatment, the blender, sensing device, effectively subtract short aftertreatment and engine supercharger exit distance, the tail gas that reduces the supercharger export enters into aftertreatment temperature loss, improvement aftertreatment conversion performance that can furthest, reduce blender urea crystallization risk, improve the whole system to engine compartment space adaptability, make it have better assembly type.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a novel automobile exhaust aftertreatment system comprises an NSC cylinder, a urea mixer, an SDPF cylinder and a urea nozzle; one end of the NSC cylinder is provided with an NSC inlet, the other end of the NSC cylinder is connected with a urea mixer through a pipeline, and the urea mixer is connected with the SDPF cylinder; the urea nozzle is arranged on a pipeline between the NSC cylinder and the urea mixer.

The NSC cylinder, the urea mixer and the SDPF cylinder are tightly coupled together, the whole arrangement is similar to a U-shaped structure, and the NSC cylinder, the urea mixer and the SDPF cylinder are fixed on an engine cylinder body through an NSC fixing support.

The NSC inlet is directly connected with the air outlet of the turbocharger through a hoop, and engine tail gas enters the NSC cylinder through the NSC inlet.

The SDPF cylinder body air outlet end is designed with two air outlets, one air outlet is connected with the SCR cylinder body through an exhaust pipeline, and the other air outlet is directly connected with a low-pressure EGR system through a hoop structure.

The inner wall of the SDPF cylinder body is of a wall-flow structure.

And catalysts are coated on the inner wall surfaces of the NSC cylinder, the SDPF cylinder and the SCR cylinder.

The low-pressure EGR system comprises a low-pressure EGR cooler, a low-pressure EGR gas taking port and a low-pressure EGR control valve, and the low-pressure EGR control valve automatically controls the time and the size of the tail gas entering the low-pressure EGR system.

The SDPF cylinder is connected with the exhaust pipeline through an SDPF outlet pipe.

The exhaust pipeline and the post-processing end cone are sequentially provided with sensors

The beneficial effects of the utility model reside in that:

the utility model adopts U-shaped arrangement, and fixes the post-treatment system on the engine cylinder body through the bracket, which is convenient to provide a gas intake port for the low-pressure EGR system, and can effectively shorten the gas intake length of the low-pressure EGR system, thereby improving the gas intake efficiency of the low-pressure EGR and shortening the response time, and effectively reducing the exhaust emission of the engine; meanwhile, the adaptability of the whole system to the space of the engine compartment is improved, so that the system has a better assembling type.

Drawings

FIG. 1 is an elevation view of an automotive exhaust aftertreatment system of the present invention;

FIG. 2 is a top view of the automotive exhaust aftertreatment system of the present invention;

FIG. 3 is a right side view of the automotive exhaust aftertreatment system of the present invention;

in the figure: 1. an NSC inlet; 2. an NSC cylinder; 3. a urea mixer; 4. an SDPF cartridge; 5. an SDPF outlet pipe; 6. an SCR cylinder; 7. a low pressure EGR system; 8. a low pressure EGR gas intake; 9. an NSC-fixed scaffold; 10. a urea nozzle; 11. a low pressure EGR cooler; 12. a low pressure EGR control valve; 13. an exhaust line; 14. and (5) post-processing the end cone.

Detailed Description

For a better understanding of the present invention, the following description is given in conjunction with the accompanying drawings.

Example (b): see fig. 1-3.

A novel automobile exhaust aftertreatment system comprises an NSC cylinder 2, a urea mixer 3, an SDPF cylinder 4 and a urea nozzle 10; one end of the NSC cylinder 2 is provided with an NSC inlet 1, the other end of the NSC cylinder is connected with a urea mixer 3 through a pipeline, and the urea mixer 3 is connected with an SDPF cylinder 4; the urea nozzle 10 is installed on a pipe between the NSC cylinder 2 and the urea mixer 3.

The NSC cylinder 2, the urea mixer 3 and the SDPF cylinder 4 are tightly coupled together, the whole arrangement is similar to a U-shaped structure, and the NSC cylinder is fixed on an engine cylinder through an NSC fixing support 9.

The NSC inlet 1 is directly connected with the air outlet of the turbocharger through a hoop, and engine tail gas enters the NSC cylinder body 2 through the NSC inlet 1.

The air outlet end of the SDPF cylinder 4 is provided with two air outlets, one air outlet is connected with the SCR cylinder 6 through an exhaust pipeline 13, and the other air outlet is directly connected with the low-pressure EGR system 7 through a hoop structure.

The inner wall of the SDPF cylinder 4 is of a wall-flow structure.

And catalysts are coated on the inner wall surfaces of the NSC cylinder 2, the SDPF cylinder 4 and the SCR cylinder 6.

The low-pressure EGR system 7 comprises a low-pressure EGR cooler 11, a low-pressure EGR gas taking port 8 and a low-pressure EGR control valve 12, and the time and the size of the tail gas entering the low-pressure EGR system 7 are automatically controlled by the low-pressure EGR control valve 12.

The SDPF cylinder 4 is connected with an exhaust pipeline 13 through an SDPF outlet pipe 5.

And sensors are sequentially arranged on the exhaust pipeline 13 and the aftertreatment end cone 14.

The utility model relates to a novel automobile exhaust aftertreatment system's the concrete process of tail gas aftertreatment does:

the engine tail gas enters the NSC cylinder 2 through the NSC inlet 1, and is chemically reacted under the action of the catalyst coated on the inner wall of the NSC cylinder 2 to convert most of CO and HC and part of NO_XAnd PM; then the mixture enters a urea mixer 3, urea sprayed out of a urea nozzle 10 is uniformly mixed with tail gas, and then the mixture flows into an SDPF cylinder 4, most PM is collected through a wall-flow structure of the SDPF cylinder 4, and most NO in the tail gas_XAnd NH₃The reduction chemical reaction is carried out under the action of the catalyst coated on the inner wall of the SDPF cylinder body 4 to generate N₂And H₂O; then a small part of tail gas from the SDPF cylinder 4 flows into a low-pressure EGR system 7 through a low-pressure EGR gas taking port 8 and then enters an engine combustion chamber through the low-pressure EGR system 7, so that the generation of NO generated by engine combustion is reduced_XThe size and time of the exhaust gas flowing into the low-pressure EGR system 7 are controlled by a low-pressure EGR control valve 12, and most of the remaining exhaust gas passes through an exhaust pipeThe path 13 enters the SCR cylinder 6 and residual NO is generated under the action of a catalyst coated on the inner wall of the SCR cylinder 6_XAnd NH₃Reduction to N₂And H₂And O, thereby achieving the purpose of removing the pollutants harmful to the environment in the tail gas and enabling the tail gas to meet the requirements of the corresponding emission regulations of the national Liu B.

Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can be modified or replaced with other embodiments without departing from the spirit and scope of the present invention, and all such modifications and equivalent substitutions are intended to be encompassed by the scope of the following claims.

Claims

1. The novel automobile exhaust aftertreatment system is characterized by comprising an NSC cylinder (2), a urea mixer (3), an SDPF cylinder (4) and a urea nozzle (10); one end of the NSC cylinder (2) is provided with an NSC inlet (1), the other end of the NSC cylinder is connected with a urea mixer (3) through a pipeline, and the urea mixer (3) is connected with the SDPF cylinder (4); the urea nozzle (10) is arranged on a pipeline between the NSC cylinder (2) and the urea mixer (3).

2. A new automotive exhaust aftertreatment system according to claim 1, characterized in that the NSC cartridge (2), urea mixer (3) and SDPF cartridge (4) are tightly coupled together, the whole arrangement resembling a U-shaped structure and being fixed to the engine block by NSC fixing brackets (9).

3. A novel automotive exhaust aftertreatment system according to claim 1 wherein the NSC inlet (1) is directly connected to the turbocharger outlet by a clamp, and engine exhaust enters the NSC cylinder (2) through the NSC inlet (1).

4. The new type of automobile exhaust gas after-treatment system as recited in claim 1, characterized in that the outlet end of the SDPF cylinder (4) is designed with two outlets, one of which is connected with the SCR cylinder (6) through the exhaust pipe (13), and the other is directly connected with the low pressure EGR system (7) through the clamp structure.

5. The new automotive exhaust aftertreatment system of claim 1, wherein the SDPF cartridge (4) interior wall is of wall flow construction.

6. The new automotive exhaust aftertreatment system of claim 1, wherein the NSC cartridge (2), SDPF cartridge (4), and SCR cartridge (6) are coated with a catalyst on their interior walls.

7. The new automobile exhaust gas after-treatment system according to claim 4, characterized in that the low-pressure EGR system (7) comprises a low-pressure EGR cooler (11), a low-pressure EGR gas intake (8) and a low-pressure EGR control valve (12), and the low-pressure EGR control valve (12) automatically controls the time and the size of the exhaust gas introduced into the low-pressure EGR system (7).

8. The new automotive exhaust aftertreatment system according to claim 4, characterized in that the SDPF cylinder (4) is connected to the exhaust line (13) through an SDPF outlet duct (5).

9. A new type of automotive exhaust aftertreatment system according to claim 4, characterized in that sensors are arranged in sequence on the exhaust line (13) and the aftertreatment end cone (14).