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A flexible integrated device and method for purifying diesel exhaust gas

An integrated device and exhaust gas purification technology, which is applied in the direction of exhaust devices, noise reduction devices, mechanical equipment, etc., can solve problems such as the influence of regeneration effect and the effect of post-treatment purification of diesel engine exhaust, and achieve the effect of improving the comprehensive purification effect

Active Publication Date: 2016-05-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the regeneration technology uses active regeneration technology such as electric heating or oil injection, it will have little effect on its regeneration effect; but if it uses passive regeneration technology such as catalytic regeneration or additive regeneration, since regeneration requires a certain exhaust temperature , so the regeneration effect will be affected
[0008] It can be seen that the simultaneous use of DOC+DPF+SCR technology can reduce the emission of various harmful pollutants from diesel engines, but due to the sequence of the system layout of the latter two, it affects its post-treatment purification effect on diesel engine exhaust

Method used

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  • A flexible integrated device and method for purifying diesel exhaust gas
  • A flexible integrated device and method for purifying diesel exhaust gas
  • A flexible integrated device and method for purifying diesel exhaust gas

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: When the diesel engine is under high load (load rate greater than or equal to 50%), DOC+DPF front+SCR rear are adopted.

[0023] Such as figure 1 As shown, the device consists of diesel engine exhaust pipe 2, DOC diesel engine oxidation catalyst 3, DOC rear end pipe 4, air flow control valve 5, DPF exhaust valve 6, SCR exhaust valve 7, DPF front end pipe 8, SCR front end pipe 9 , DPF diesel particulate filter 10, SCR selective catalytic reduction device 11 and connecting pipe 12. One side of the DOC diesel engine oxidation catalyst 3 is connected to the diesel engine 1 through the diesel engine exhaust pipe 2, and the other side is connected to one end of the DOC rear end pipe 4. One side of the airflow control valve 5 is connected to the other end of the DOC rear end pipe 4, and the upper side is connected to the DPF front end pipe. 8, the lower side is connected to one end of the SCR front-end pipe 9, the other end of the DPF front-end pipe 8 is connect...

Embodiment 2

[0025] Embodiment 2: When the diesel engine is under low load (load ratio is less than 50%), DOC+SCR front+DPF rear are adopted.

[0026] Using the device described in Embodiment 1, when the diesel engine is working in a low-load state, the airflow control valve 5 is in the upper position and the DPF exhaust valve 6 and the SCR exhaust valve 7 are in the following positions: figure 2 position, the exhaust gas flow after passing through the DOC diesel engine oxidation catalyst first enters the SCR front-end pipe 9, then the exhaust gas flow passes through the SCR selective catalytic reduction device 11, flows into the DPF diesel particulate filter 10 through the connecting pipe 12, and then flows through the DPF front-end pipe 8. Finally discharged into the atmosphere.

[0027] Adopt the displacement described in embodiment 1 to be the diesel engine of 7 liters, as Figure 4 As shown, when the exhaust gas temperature is 200°C under low load, the NO X The conversion efficienc...

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Abstract

The invention relates to flexible integrated equipment and method thereof for diesel tail gas purification. The device comprises a DOC (diesel oxidation catalyst), a DPF (diesel particulate filter), a SCR (selective catalytic reduction) device, tail gas valves, an airflow control valve, an exhaust pipe, a connection pipe and the like. The airflow control valve is respectively connected with a DOC rear-end pipe, a DPF front-end pipe and a SCR front-end pipe. A rotatable DPF tail gas valve is arranged in the DPF front-end pipe which is connected with the DPF, a rotatable SCR tail gas valve is arranged in the SCR front-end pipe which is connected with the SCR, and the rear end of the SCR device is connected with the rear end of the DPF through the connection pipe. According to different diesel loads, sequence of waste gas flow passing through the DPF and the SCR device is flexibly adjusted after the waste gas flow passes through the DOC, advantages of each arrangement plans can be taken to the maximum extent, and accordingly comprehensive purification effects of particulates and nitrogen oxides in diesel waste gas can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of post-treatment of diesel engine exhaust, and in particular relates to a DOC+DPF+SCR (diesel engine oxidation catalyst + diesel particle filter + selective catalytic reduction device) flexible integrated device and method for purifying diesel engine exhaust. Background technique [0002] Due to its good economy and power, diesel engines are widely used in transportation, agricultural machinery and construction machinery and other fields. The exhaust of diesel engines mainly includes harmful pollutants such as carbon monoxide (CO), hydrocarbons (HC), particulates (PM) and nitrogen oxides (NOx), among which the emissions of particulates (PM) and nitrogen oxides (NOx) are relatively high , has great harm to the environment and human body, so the emission regulations of various countries have become more and more strict on the emission limits of diesel engine PM and NOx. In addition to adopting necessary inte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28
Inventor 谭丕强俞锐康胡志远楼狄明
Owner TONGJI UNIV