CN219492369U

CN219492369U - Natural gas tight coupling aftertreatment device

Info

Publication number: CN219492369U
Application number: CN202320285092.7U
Authority: CN
Inventors: 胡亮; 田洪越; 姜鸿澎; 穆春芳
Original assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Current assignee: China National Heavy Duty Truck Group Jinan Power Co Ltd
Priority date: 2023-02-22
Filing date: 2023-02-22
Publication date: 2023-08-08
Anticipated expiration: 2033-02-22

Abstract

The utility model provides a natural gas tight coupling aftertreatment device, which relates to the technical field of exhaust aftertreatment of motor vehicles, and adopts the following scheme: the device comprises an exhaust pipe, wherein a front-stage tightly-coupled post-processor is arranged at the front part of the exhaust pipe, a supercharger or an exhaust butterfly valve is arranged in front of the front-stage tightly-coupled post-processor, a rear-stage post-processor is arranged at the rear part of the exhaust pipe, and the supercharger or the exhaust butterfly valve, the front-stage tightly-coupled post-processor and the rear-stage post-processor are sequentially connected in series on the exhaust pipe. The utility model has the following effects: by arranging the front-stage tightly-coupled post-processor and the rear-stage post-processor and adopting the arrangement mode that the two-stage post-processors are connected in series, the temperature of the front-stage tightly-coupled post-processor is effectively improved, and the catalyst conversion efficiency in the cold start stage of the engine is improved.

Description

Natural gas tight coupling aftertreatment device

Technical Field

The utility model relates to the technical field of exhaust aftertreatment of motor vehicles, in particular to a natural gas tight coupling aftertreatment device.

Background

The existing natural gas state six post-treatment system mainly adopts a TWC (three way catalysis) technical route, a post-processor is arranged on a frame at the rear end of an engine, and the engine is connected with the post-processor through a long exhaust pipeline. As disclosed in patent document CN111878198A and publication day 2020, 11 and 03, an exhaust aftertreatment system for an internal combustion engine and applications thereof, the aftertreatment system comprises an air inlet pipe, a plurality of aftertreatment devices and an exhaust pipe connected in sequence, the aftertreatment devices comprise a housing, a carrier is arranged in the housing, the carrier is a honeycomb ceramic carrier, and exhaust passages for exhaust gas to pass through are densely distributed in the cylindrical carrier; the casing divide into inlet end and exhaust end along the flow direction of gas, and the inlet end is equipped with the expansion pipe that admits air, and the internal diameter of expansion pipe that admits air is along the flow direction of gas and is increased gradually, and the exhaust end is equipped with the exhaust shrink pipe, and the internal diameter of exhaust shrink pipe is along the flow direction of gas and is reduced gradually. When such an aftertreatment device is arranged on the rear frame of the engine, a long exhaust gas line is required for connection to the engine.

However, because the above-mentioned prior art engine and the after-treatment device have long connecting pipes, temperature loss in the exhaust process is increased, and NOx and CH4 conversion efficiency is seriously affected, especially in the cold start stage of the engine.

Therefore, the development of a natural gas tight coupling aftertreatment device is an urgent problem to be solved, aiming at the current situation that the exhaust temperature loss is large and the conversion efficiency of NOx and CH4 is seriously affected due to the long connecting pipeline between the aftertreatment device and the engine in the prior art.

Disclosure of Invention

The utility model aims to provide and design a natural gas tight coupling aftertreatment device aiming at the problems that when the existing automobile aftertreatment system adopts a TWC (three way catalysis) technology, the exhaust temperature loss is large and the conversion efficiency of NOx and CH4 is seriously affected when an engine and an aftertreatment device are connected through a long section of exhaust pipeline.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a natural gas tight coupling aftertreatment device, includes the blast pipe, and the front portion of blast pipe is provided with preceding stage tight coupling aftertreatment ware, and the place ahead of preceding stage tight coupling aftertreatment ware is provided with booster or exhaust butterfly valve, and the rear portion of blast pipe is provided with the aftertreatment ware of back level, and booster or exhaust butterfly valve, preceding stage tight coupling aftertreatment ware, back level aftertreatment ware establish ties in proper order on the blast pipe. By arranging the front-stage tightly-coupled post-processor and the rear-stage post-processor and adopting the arrangement mode that the two-stage post-processors are connected in series, the temperature of the front-stage tightly-coupled post-processor is effectively improved, and the catalyst conversion efficiency in the cold start stage of the engine is improved. Specifically, the tail gas exhausted by the engine directly enters a front-stage tightly-coupled post-processor through a supercharger or an exhaust butterfly valve, and a large amount of pollutants are removed under the catalytic reduction action of a front-stage TWC; then the pollutant content in the tail gas reaches the national sixth emission standard under the catalytic reduction effect of the TWC at the later stage after entering the post-processor through the exhaust pipeline.

Further, the front-stage tightly-coupled post-processor is in a columnar structure and is arranged at the rear end of the supercharger or the exhaust butterfly valve, a front-stage TWC coated carrier is packaged in the rear-stage tightly-coupled post-processor, and the rear-stage tightly-coupled post-processor can perform a first-stage catalytic reduction reaction on tail gas.

Furthermore, the air inlet end of the front-stage tightly-coupled post-processor is of a variable-section air inlet cone structure, so that the uniform distribution of carrier inlet air flow is ensured.

Further, the post-processor is in a columnar structure and is arranged on the frame, a post-carrier coated by the post-TWC is packaged in the post-processor, and the post-processor can perform a second-stage catalytic reduction reaction on the tail gas.

Furthermore, the air inlet end of the post-processor is of a variable cross section air inlet cone structure, and uniform distribution of carrier inlet air flow is ensured.

Further, a front-stage close-coupled post-processor TWC packaging unit is arranged in the front-stage close-coupled post-processor, a first oxygen sensor is arranged at the front end of the front-stage close-coupled post-processor TWC packaging unit, a post-stage post-processor TWC packaging unit is arranged in the post-stage post-processor, a second oxygen sensor is arranged at the front end of the post-stage post-processor TWC packaging unit, and the first oxygen sensor and the second oxygen sensor are arranged on the exhaust pipe. The oxygen concentration at each location is monitored by providing a first oxygen sensor and a second oxygen sensor.

Further, the post-processor is connected with a post-processor perforated pipe. The post-processor perforated pipe is connected with a post-processor air outlet pipe. The tail gas is discharged into the atmosphere through the perforated pipe of the post-processor and the air outlet pipe of the post-processor in sequence.

Further, a third oxygen sensor is arranged on an air outlet pipe of the post-processor and used for detecting the oxygen concentration at the position.

From the above technical scheme, the utility model has the following advantages:

the scheme provides a natural gas tight coupling aftertreatment device, which adopts a two-stage aftertreatment serial arrangement mode, so that the temperature of a front-stage tight coupling aftertreatment device is effectively increased, and the catalyst conversion efficiency in the cold start stage of an engine is improved; the front stage tightly coupled post-processor and the post-processor adopt variable cross section air inlet end cone structures, so that the air flow is uniformly distributed at the front end of the carrier.

Drawings

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 drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.

Fig. 2 is a schematic structural diagram of a pre-stage close-coupled post-processor according to an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a post-processor in the following stage according to an embodiment of the present utility model.

In the figure: 1. the device comprises a supercharger, 2, a first oxygen sensor, 3, a front-stage close-coupled post-processor, 4, a second oxygen sensor, 5, an exhaust pipe, 6, a third oxygen sensor, 7, a post-stage post-processor, 31, a front-stage close-coupled post-processor air inlet pipe, 32, a front-stage close-coupled post-processor air inlet cone structure, 33, a front-stage close-coupled post-processor TWC packaging unit, 34, a front-stage close-coupled post-processor air outlet cone structure, 35, a front-stage close-coupled post-processor air outlet pipe, 71, a post-stage post-processor air inlet cone structure, 72, a post-stage post-processor TWC packaging unit, 73, a post-stage post-processor perforated pipe, 74, a post-stage post-processor end cover, 75 and a post-stage post-processor air outlet pipe.

Detailed Description

In order to make the objects, features and advantages of the present utility model more obvious and understandable, the technical solutions of the present utility model will be clearly and completely described below with reference to the drawings in this specific embodiment, and it is apparent that the embodiments described below are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, based on the embodiments in this patent, which would be within the purview of one of ordinary skill in the art without the particular effort to make the utility model are intended to be within the scope of the patent protection.

As shown in fig. 1 to 3, the present embodiment provides a natural gas tight coupling post-treatment device, which includes a front-stage tight coupling post-treatment device 3, a first oxygen sensor 2, an exhaust pipe 5, a second oxygen sensor 4, a post-stage post-treatment device 7, and a third oxygen sensor 6, wherein the front-stage tight coupling post-treatment device 3 mainly includes a front-stage tight coupling post-treatment device air inlet pipe 31, a front-stage tight coupling post-treatment device air inlet cone structure 32, a front-stage tight coupling post-treatment device TWC packaging unit 33, a front-stage tight coupling post-treatment device air outlet cone structure 34, and a front-stage tight coupling post-treatment device air outlet pipe 35, and the post-stage post-treatment device 7 mainly includes a post-stage post-treatment device air inlet cone structure 71, a post-stage post-treatment device TWC packaging unit 72, a post-stage post-treatment device through pipe 73, a post-stage post-treatment device end cover 74, and a post-stage post-treatment device air outlet pipe 75.

Wherein, the front stage tightly coupled post processor 3 is of a columnar structure and adopts a variable cross section air inlet end cone 32; the post-processor 7 is of a columnar structure and is arranged on the frame, and the variable cross-section air inlet end cone 71 is adopted to ensure that the air flow at the inlet of the carrier is uniformly distributed.

Wherein, the first oxygen sensor 2 is arranged at the front end of the front-stage close-coupled post-processor TWC packaging unit 33, the second oxygen sensor 4 is arranged at the front end of the post-processor TWC packaging unit 72, and the third oxygen sensor 6 is arranged on the post-processor air outlet pipe 75 to monitor the oxygen concentration of each position.

It should be noted that the present utility model may determine the carrier specifications of the front stage close-coupled post-processor TWC package unit 33, the post-stage post-processor TWC package unit 72, such as a front stage close-coupled post-processor TWC carrier diameter of 7.5 inches, and a post-stage post-processor TWC carrier diameter of 12 inches, depending on the platform motor displacement for a particular application.

The working principle is as follows: the exhaust gas discharged from the engine directly enters the front-stage close-coupled postprocessor 3 through the exhaust butterfly valve or the supercharger 1, a large amount of pollutants are removed under the first-stage catalytic reduction effect of the front-stage close-coupled postprocessor TWC packaging unit 33, then the exhaust gas enters the rear-stage postprocessor 7 through an exhaust pipeline, the pollutant content in the exhaust gas reaches the national six-emission standard under the second-stage catalytic reduction effect of the rear-stage postprocessor TWC packaging unit 72, and finally the exhaust gas is discharged into the atmosphere through the rear-stage postprocessor perforated pipe 73 and the rear-stage postprocessor air outlet pipe 75 in sequence.

The terms "upper," "lower," "outboard," "inboard," and the like in the description and in the claims of the utility model and in the above figures, if any, are used for distinguishing between relative relationships in position and not necessarily for giving qualitative sense. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

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. The utility model provides a natural gas tight coupling aftertreatment device, includes the blast pipe, its characterized in that, the front portion of blast pipe is provided with preceding stage tight coupling aftertreatment ware, and the place ahead of preceding stage tight coupling aftertreatment ware is provided with booster or exhaust butterfly valve, and the rear portion of blast pipe is provided with the aftertreatment ware of back level, and booster or exhaust butterfly valve, preceding stage tight coupling aftertreatment ware, back level aftertreatment ware are established ties on the blast pipe in proper order.

2. The natural gas tight coupling aftertreatment device according to claim 1 wherein the front-stage tight coupling aftertreatment device is in a columnar structure and is arranged at the rear end of a supercharger or an exhaust butterfly valve, and a front-stage TWC coated carrier is packaged inside the front-stage tight coupling aftertreatment device.

3. The natural gas tight coupling aftertreatment device of claim 2, wherein the inlet end of the pre-stage tight coupling aftertreatment device is of a variable cross-section inlet cone structure.

4. A natural gas close-coupled aftertreatment device according to claim 3 wherein the post-processor is of a columnar configuration and wherein the post-processor is internally packaged with a post-TWC coated carrier.

5. The natural gas tight coupling aftertreatment device according to claim 4 wherein the air inlet end of the aftertreatment device is of variable cross-section air inlet cone structure.

6. The natural gas tight coupling aftertreatment device according to claim 5, wherein a front-stage tight coupling aftertreatment device TWC packaging unit is arranged in the front-stage tight coupling aftertreatment device, a first oxygen sensor is arranged at the front end of the front-stage tight coupling aftertreatment device TWC packaging unit, a rear-stage aftertreatment device TWC packaging unit is arranged in the rear-stage aftertreatment device, a second oxygen sensor is arranged at the front end of the rear-stage aftertreatment device TWC packaging unit, and the first oxygen sensor and the second oxygen sensor are installed on the exhaust pipe.

7. The natural gas tight coupling aftertreatment device of claim 6, wherein the aftertreatment device is coupled with a aftertreatment device perforated tube.

8. The natural gas tight coupling post-treatment device according to claim 7, wherein the post-processor perforated pipe is connected with a post-processor air outlet pipe.

9. The natural gas tight coupling aftertreatment device according to claim 8 wherein a third oxygen sensor is mounted on the aftertreatment outlet pipe.