A kind of post-treatment method of diesel engine exhaust particulates

A diesel engine and particulate technology, applied in exhaust devices, mechanical equipment, engine components, etc., can solve the problems of low filtration efficiency, easy damage to the filter body, and large flow resistance, and achieve enhanced filtration efficiency, efficient and rapid regeneration, and flow resistance. small effect

Active Publication Date: 2017-06-16
盐城市富源引擎科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The current diesel particulate aftertreatment method mainly adopts wall-flow diesel particulate filter. The high exhaust back pressure of the diesel engine causes the fuel consumption of the diesel engine to increase, and the current filter body regeneration mostly adopts various forms of heating regeneration methods, and the filter body is easily damaged during regeneration.
In the prior art, ceramic foam is directly used to filter diesel engine particles. Although it has the advantage of low exhaust back pressure, the filter efficiency is low due to the large pore size of ceramic foam, and the filter body is easily damaged when heating and regeneration is used.

Method used

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  • A kind of post-treatment method of diesel engine exhaust particulates
  • A kind of post-treatment method of diesel engine exhaust particulates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking the 186F single-cylinder air-cooled diesel engine produced by a certain factory as the experimental prototype, the figure 2 The shown device, which includes a filter regeneration unit, aftertreatment of exhaust gas from a diesel engine using the method according to the invention. During the experiment, the operating condition of the engine was 1800r / min, 16N.m, and when the device of the present invention was not installed for post-treatment, the exhaust smoke of the original machine was 1.9BSU, and the exhaust back pressure was about 740Pa.

[0027] Step 1, using a partial dielectric barrier corona discharge with a discharge power of 12 watts to charge the particles flowing through the foam ceramics, and filter the diesel engine exhaust particles through the foam ceramics;

[0028] Step 2, when the amount of diesel engine exhaust particles accumulated in the foam ceramics causes the diesel exhaust back pressure to rise to 2.5kPa, use a 150W discharge power to f...

Embodiment 2

[0031] Experiments were carried out using the engine and aftertreatment device described in Example 1, and the engine operating conditions were as described in Example 1.

[0032] Step 1, using a partial dielectric barrier corona discharge with a discharge power of 20 watts to charge the particles flowing through the foam ceramics, and filter the diesel engine exhaust particles through the foam ceramics;

[0033] Step 2, when the amount of diesel exhaust particles accumulated in the foam ceramics causes the diesel exhaust back pressure to rise to 2.8kPa, use a 240W discharge power to fill the entire dielectric tube space with a filamentary discharge to decompose the accumulated particles to achieve foam Regeneration of ceramic filters.

[0034] It is found through experiments that after the post-treatment by the method of the present invention, the engine exhaust wave smoke degree is 0.2BSU, and the filtration efficiency is 89.4%; adopt 240W discharge power to carry out filter...

Embodiment 3

[0036] Experiments were carried out using the engine and aftertreatment device described in Example 1, and the engine operating conditions were as described in Example 1.

[0037] Step 1, using a partial dielectric barrier corona discharge with a discharge power of 30 watts to charge the particles flowing through the foam ceramics, and filter the diesel engine exhaust particles through the foam ceramics;

[0038] Step 2, when the amount of diesel engine exhaust particles accumulated in the foam ceramics causes the diesel engine exhaust back pressure to rise to 2.94kPa, use a 330W discharge power to fill the entire dielectric tube space with a filamentary discharge to decompose the accumulated particles to achieve foam Regeneration of ceramic filters.

[0039] It is found by experiments that after the post-treatment through the method of the present invention, the engine exhaust smoke level is 0.1BSU, and the filtration efficiency is 94.7%; adopt 330W discharge power to regener...

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Abstract

The invention discloses a post-treatment method for diesel engine exhaust particulates, which uses high-energy electrons generated by local dielectric barrier corona discharge with relatively small discharge power to charge diesel exhaust particulates, and charges the exhaust particulates of diesel engines through foam ceramics placed in an alternating electric field. Filtration of diesel engine exhaust particles; when the amount of diesel exhaust particles accumulated in the foam ceramics causes the exhaust back pressure of the diesel engine to rise, a large discharge power is used to fill the entire space of the dielectric tube with a filamentary discharge, generating a large amount of low-temperature plasma Oxidatively decomposes the diesel exhaust particles accumulated in the foam ceramics to realize the regeneration of the foam ceramic filter body. The invention can ensure that the exhaust back pressure of the diesel engine is low and effectively avoid damage to the filter body during regeneration, and at the same time improve the filtering efficiency of the exhaust particles of the diesel engine. The invention can be applied to aftertreatment of exhaust particulates of diesel engines.

Description

technical field [0001] The invention belongs to the technical field of diesel engine exhaust purification treatment, and in particular relates to a diesel engine exhaust particulate filtering technology. Background technique [0002] The particulate emission of diesel engine is relatively high, which is an important source of inhalable particulate in the atmosphere and seriously threatens people's health. In order to effectively control the particulate emissions of diesel engines, it is necessary to use post-processing technology and devices to treat the exhaust of diesel engines on the basis of internal purification technology measures. Particulate filtration technology can effectively reduce diesel particulate emissions, and this technology is currently the closest commercialized diesel particulate post-treatment technology in the world. However, when particle filtration technology is used to remove diesel engine exhaust particles, the particles will accumulate in the fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/033F01N3/023
Inventor 袁加付
Owner 盐城市富源引擎科技有限公司
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