CN212337414U

CN212337414U - DPF tightens coupled after-treatment system before whirlpool

Info

Publication number: CN212337414U
Application number: CN202020338670.5U
Authority: CN
Inventors: 陶泽民; 张运升; 李福生
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2021-01-12
Anticipated expiration: 2030-03-18

Abstract

The utility model discloses a DPF steps up aftertreatment system of coupling before whirlpool is applied to the diesel engine of taking turbo charger, its characterized in that: the aftertreatment system comprises a diesel particulate filter (5) and a selective catalytic reducer (6), wherein the diesel particulate filter (5) is arranged at the front end of the turbocharger (2), and the selective catalytic reducer (6) is tightly coupled with the rear end of the turbocharger (2). The utility model discloses aim at solves among the prior art problem such as DPF is low, the engine oil consumption is effective again, can effective reduce cost.

Description

DPF tightens coupled after-treatment system before whirlpool

Technical Field

The utility model relates to a diesel engine aftertreatment field specifically is a DPF steps up post-processing system of coupling before whirlpool.

Background

As shown in fig. 1 and 2, in the sixth current commercial country, an arrangement form of an exhaust manifold 1-a turbocharger 2-a turbine rear exhaust connecting pipe 3-a diesel oxidation catalyst + a diesel particulate filter + a selective catalytic reduction device is adopted, in the arrangement form, a diesel oxidation catalyst 4, a diesel particulate filter 5 and a selective catalytic reduction device 6 are sequentially arranged at the rear end of the exhaust connecting pipe behind the turbocharger 2 of a diesel engine, the tail gas needs to pass through the turbocharger 2 first and then the turbine rear exhaust connecting pipe 3, the pipeline of the section is long, as shown in fig. 2, the length is generally about 1 m to 3.5 m, and then the tail gas sequentially passes through the diesel oxidation catalyst 4, the diesel particulate filter 5 and the selective catalytic reduction device 6. The temperature loss is large when the exhaust gas reaches the diesel particulate filter 5 section, and the regeneration of the diesel particulate filter 5 requires a high temperature, and therefore, there is a problem that the regeneration efficiency is low, and the like, whereby the engine exhaust gas temperature must be raised by measures such as a throttle valve, exhaust gas throttling, late fuel injection, HC injection, and the like, which results in the improvement of reliability by increasing the volume of the diesel particulate filter 5, and the engine fuel consumption is increased.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned current defect, the utility model aims to provide a DPF steps up post-processing system of coupling before whirlpool, solve among the prior art problem such as DPF low, the engine oil consumption of taking effect rate is again, can effective reduce cost.

The technical scheme of the utility model as follows:

the utility model provides a pre-vortex DPF clamping coupling's aftertreatment system, is applied to the diesel engine of taking turbo charger which characterized in that: the aftertreatment system includes a diesel particulate filter disposed at a front end of a turbocharger and a selective catalytic reducer closely coupled to a rear end of the turbocharger.

The utility model discloses set up diesel particulate filter at turbocharger's front end, the temperature behind the turbocharger of temperature ratio is about 100 high before the turbocharger, under this temperature, diesel particulate filter can carry out pure passive regeneration, need not initiatively regenerate, thereby reduce system cost and the automatically controlled work load of maring of engine development, pressure is about the twice after the whirlpool in addition before the whirlpool, the gas flow rate is less than after the whirlpool, under the same filter area condition, the air current resistance is less than after the whirlpool, under same air current resistance condition, can reduce diesel particulate filter's volume, this also can reduce cost. The selective catalytic reducer is arranged in a tight coupling mode, so that the heat loss of the traditional scheme is reduced, the temperature of the selective catalytic reducer is increased, the reaction efficiency is high, and if the same efficiency is kept, the size of the selective catalytic reducer can be reduced, and the cost can be reduced.

Specifically, the inlet end of the selective catalytic reducer is provided with a first flange surface, the outlet end of the turbocharger is provided with a second flange surface matched with the first flange surface, and the first flange surface and the second flange surface are tightly coupled and connected through bolts.

Specifically, a diesel oxidation catalyst is further arranged at the front end of the diesel particulate filter.

Compared with the prior art, the utility model discloses following beneficial effect has:

according to the scheme, a diesel particle filter or a diesel oxidation catalyst plus the diesel particle filter is arranged between an engine exhaust manifold and a turbocharger, and a tightly coupled selective catalytic reduction device is arranged behind the turbocharger without a transition pipeline, so that the comprehensive benefits of improving the reaction temperature, improving the reaction efficiency, reducing the volume of the catalyst and reducing the cost are achieved.

Drawings

FIG. 1 is a schematic diagram of a prior art post-treatment system.

FIG. 2 is a schematic gas flow diagram of a prior art aftertreatment system.

FIG. 3 is a schematic diagram of a pre-vortex DPF clamping coupling after-treatment system according to the present embodiment.

FIG. 4 is a schematic gas flow diagram of the pre-vortex DPF clamping coupled after-treatment system of the present embodiment.

In the figure, 1-engine exhaust manifold, 2-turbocharger, 3-turbine exhaust adapter, 4-diesel oxidation catalyst, 5-diesel particulate filter, 6-selective catalytic reducer, 7-intercooler, 8-throttle.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.

An after-treatment system for clamping coupling of a pre-turbine DPF is applied to a diesel engine with a turbocharger 2, and comprises a diesel particulate filter 5 and a selective catalytic reducer 6, wherein the diesel particulate filter 5 is arranged at the front end of the turbocharger 2, and the selective catalytic reducer 6 is tightly coupled with the rear end of the turbocharger 2.

The principle of the post-treatment system for clamping and coupling the pre-vortex DPF is as follows: the arrows in fig. 4 reflect the general trend of engine exhaust. When the diesel engine runs, the exhaust gas firstly enters the diesel particle filter 5 from the engine exhaust manifold 1 and then passes through the turbocharger 2, because the temperature at the front end of the turbocharger 2 is about 100 ℃ higher than the temperature at the rear end of the turbocharger 2, the diesel particle filter 5 can be purely passively regenerated at the higher temperature at the front end of the turbocharger 2, and the active regeneration of the exhaust temperature of the engine is improved without measures such as a throttle valve 8, exhaust throttling, delayed oil injection, HC injection and the like, so that the system cost and the engine development electronic control calibration workload are reduced; in addition, the pressure before the turbocharger 2 is about twice that after the turbocharger 2, the gas flow rate is lower than that after the vortex, the airflow resistance is lower than that after the vortex under the same filtering area condition, and the volume of the diesel particulate filter 5 can be reduced under the same airflow resistance condition, so that the cost can be reduced; during exhaust gas directly got into rather than the selective catalytic reduction ware 6 of close coupling through turbocharger 2's rear end, reduced the calorific loss who arranges among the prior art scheme that longer turbine back exhaust takeover 3 leads to on the one hand, selective catalytic reduction ware 6 temperature improves, and the reaction efficiency height improves, if keep same efficiency, can reduce selective catalytic reduction ware 6's volume, this also can reduce cost, consequently reached the utility model discloses a purpose.

The close coupling of the selective catalytic reduction device 6 and the turbocharger 2 may be a flange connection, or may be adjusted according to the requirement, which is not limited in this embodiment.

In a preferred embodiment of the present invention, a diesel oxidation catalyst 4 is further provided at the front end of the diesel particulate filter 5. The diesel oxidation catalyst 4 is used to oxidize HC, CO, NO, and volatile components on the surface of the particles coming out of the engine exhaust manifold 1, and further raise the temperature of the exhaust gas, providing conditions for warm regeneration of the diesel particulate filter 5.

Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. The utility model provides a pre-vortex DPF clamping coupling's aftertreatment system, is applied to the diesel engine of taking turbo charger which characterized in that: the aftertreatment system comprises a diesel particulate filter (5) and a selective catalytic reducer (6), wherein the diesel particulate filter (5) is arranged at the front end of the turbocharger (2), and the selective catalytic reducer (6) is tightly coupled with the rear end of the turbocharger (2).

2. The system of claim 1, wherein the post-treatment system comprises: the inlet end of the selective catalytic reducer (6) is provided with a first flange surface, the outlet end of the turbocharger (2) is provided with a second flange surface matched with the first flange surface, and the first flange surface is tightly coupled with the second flange surface through bolts.

3. The system of claim 1, wherein the post-treatment system comprises: the front end of the diesel particulate filter (5) is also provided with a diesel oxidation catalyst (4).