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An engine exhaust device and an engine exhaust method

A technology of exhaust device and exhaust method, applied in the direction of exhaust device, electric control of exhaust treatment device, diagnostic device of exhaust treatment device, etc., can solve problems such as DPF clogging and DOC aging, and achieve emission satisfaction, Guarantee the conversion efficiency and avoid the effect of low oxidation efficiency

Active Publication Date: 2022-07-15
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve this problem, in the prior art, a bypass line parallel to the DOC is added upstream of the supercharger. At low temperatures, the exhaust gas is discharged into the atmosphere through the DPF and SCR, but this will cause DPF blockage; and at high temperatures, the exhaust gas passes through the DOC. , DPF and SCR are discharged into the atmosphere, and the temperature of DOC is too high, which will easily cause DOC aging

Method used

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  • An engine exhaust device and an engine exhaust method
  • An engine exhaust device and an engine exhaust method

Examples

Experimental program
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Embodiment 1

[0038] like figure 1 As shown, this embodiment provides an engine exhaust device, including a main pipeline 100, a bypass pipeline 200, a first temperature sensor 5 and a second temperature sensor 6, and the main pipeline 100 is sequentially connected with a supercharger 1, DOC2, DPF3 and SCR4, one end of the bypass line 200 is connected between the supercharger 1 and the DOC2, and the other end of the bypass line 200 can be communicated with the intake port of the DPF3. The first temperature sensor 5 is arranged between the supercharger 1 and the DOC2 for detecting the temperature of the exhaust gas entering the DOC2; the second temperature sensor 6 is arranged between the DPF3 and the SCR4 for detecting the temperature of the exhaust gas entering the SCR4. The air outlet of the supercharger 1 can selectively communicate with the air inlet of the DOC 2 or the bypass line 200 .

[0039] In the engine exhaust device provided in this embodiment, by connecting one end of the byp...

Embodiment 2

[0052] This embodiment provides an engine exhaust method, which is applied to the engine exhaust device provided in the first embodiment. The engine exhaust device includes a main pipeline 100 , a bypass pipeline 200 , a first temperature sensor 5 and a second temperature sensor 6 , the main pipeline 100 is sequentially connected with the supercharger 1, the fifth control valve 11, the DOC2, the sixth control valve 12, the DPF3, the fourth control valve 10 and the SCR4, and the bypass pipeline 200 includes a total intake port 201, a bypass Pass through the first branch 202, the third control valve 9, bypass the second branch 203 and the general air outlet 204, the first control valve 7 is provided on the bypass first branch 202, and the second branch 203 is bypassed A second control valve 8 is provided, and a third control valve 9 is provided between the bypassed first branch 202 and the bypassed second branch 203; the total intake port 201 and the first temperature sensor 5 ar...

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Abstract

The invention discloses an engine exhaust device and an engine exhaust method, and relates to the technical field of engine exhaust gas treatment. The engine exhaust device includes a main pipeline, a bypass pipeline, a first temperature sensor and a second temperature sensor. The main pipeline is sequentially connected with a supercharger, DOC, DPF and SCR, and one end of the bypass pipeline is connected to the supercharger Between the device and the DOC, the other end of the bypass line can be communicated with the air inlet of the DPF. The first temperature sensor is arranged between the supercharger and the DOC for detecting the temperature of the exhaust gas entering the DOC; the second temperature sensor is arranged between the DPF and the SCR for detecting the temperature of the exhaust gas entering the SCR. The outlet port of the supercharger can selectively communicate with the inlet port or bypass line of the DOC. The exhaust device of the engine not only avoids the low oxidation efficiency caused by the rapid aging of the DOC, but also ensures the conversion efficiency of the SCR, so that the exhaust gas emission meets the requirements.

Description

technical field [0001] The invention relates to the technical field of engine exhaust gas treatment, in particular to an engine exhaust device and an engine exhaust method. Background technique [0002] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) is a widely used exhaust gas treatment technology in diesel engine exhaust treatment. x While accelerating the reduction, it effectively inhibits the oxidation reaction. DOC (Diesel Oxidation Catalyst) is a technology that provides high temperature for DPF (Diesel Particulate Filter, Diesel Particulate Filter) regeneration by oxidizing diesel fuel. Oxidizes NO in exhaust gas to NO 2 , increasing NO 2 in NO x ratio in . [0003] In current engine exhaust treatment systems, DOC is placed before DPF and SCR to convert CO and HC in the exhaust into harmless H 2 0 and CO 2 , and the oxidation of NO in the exhaust to NO 2 , to speed up the subsequent SCR to NO x The conversion speed and efficiency, and the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N13/08F01N11/00
CPCF01N9/00F01N13/08F01N11/002Y02T10/40
Inventor 张勇褚国良房瑞雪王明明齐骏
Owner WEICHAI POWER CO LTD
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