Compound purifying device for diesel engine tail gas

Abstract

The invention discloses a compound purifying device for a diesel engine tail gas. The compound purifying device comprises a catalytic oxidation device, a gas exhaust end fixed to the catalytic oxidation device, a particulate trapping device used for adsorbing and filtering PM particulates and a gas-exhaust end gas exhaust silencer fixed to the particulate trapping device, wherein the catalytic oxidation device comprises a first housing and a purifying catalyst carrier; the particulate trapping device comprises a second housing and a honeycomb ceramic carrier; and the honeycomb ceramic carrier comprises a honeycomb body with a plurality of gas paths which are in parallel arranged side by side and a baffle plate which is fixed in each gas path in a staggered manner between any two adjacent gas paths. The compound purifying device for the diesel engine tail gas is compact in structure, is reasonable in space utilization, can carry out catalytic oxidation on a harmful gas, can realize effectively filtering all gas flow and is high in purifying efficiency; the silencer is combined for realizing purifying the tail gas and reducing noises of the tail gas; moreover, the compound purifying device is simple in structure, is low in cost, is long in service life and is convenient to mount and dismount; and the tail gas purifying and noise-reducing efficiency is high.

Description

technical field [0001] The invention relates to an exhaust gas purification device, in particular to a diesel engine exhaust compound purification device. Background technique [0002] According to the national development strategy of energy conservation and emission reduction and the national requirements to deal with greenhouse gas emissions, there is an urgent need to carry out projects for exhaust gas recovery and purification of diesel engines and generator power equipment used in engineering construction, and exhaust noise reduction projects to reduce emissions and achieve the purpose of energy conservation and emission reduction. It is closely integrated with production and engineering to improve the quality of life and normal operation of production. [0003] In the prior art, the exhaust gas treatment and noise reduction of diesel engines are both exhaust gas purification devices and mufflers working alone; unilaterally, the performance and efficiency are relatively...

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Problems solved by technology

[0003] In the prior art, the exhaust gas treatment and noise reduction of diesel engines are both exhaust gas purification devices and mufflers working alone; unilaterally, the performance and efficiency are relatively low; there are two types of pollution control technologies for diesel engine exhaust: organic internal purification and external purification, the former is the basis, and the latter It is an essential and important part. Only the combination of the two can make diesel engine pollution control within the scope of increasingly stringent regulations, and the first choice for external purification should be the catalytic oxidation converter. At present, the catalytic oxidation converter is usually installed in the engine exhaust. In the pipe, the three kinds of harmful exhaust gases CO, HC and NOx emitted by the engine are converted into harmless water, carbon dioxide and nitrogen through oxidation-reduction reactions. However, the exhaust gas of diesel engines contains more toxic gases and the content of PM is too high. Only relying on catalysis Oxidation converters are difficult to effectively purify and occupy a large amount of space in the exhaust pipe. At the same time, it is difficult for the existing particle trapping device to effectively filter out PM particles. Additional purification devices are required, resulting in a huge exhaust gas treatment system, and the structure of the muffler currently on the market is complicated. , the noise reduction efficiency is low, and the pertinence is not strong; the purification device is expensive

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