Diesel engine exhaust compound noise reduction device

Abstract

The invention discloses a diesel engine tail gas composite noise reduction device. The diesel engine tail gas composite noise reduction device comprises a catalytic oxidation device body, a particle trapping device body and an exhaust silencer, wherein the particle trapping device body is fixed to the exhaust end of the catalytic oxidation device body and used for adsorbing and filtering PM particles, and the exhaust silencer is fixed to the exhaust end of the particle trapping device body. The catalytic oxidation device body comprises a first shell body and a purification catalyst carrier. The particle trapping device body comprises a second shell body and a honeycomb-shaped ceramic carrier. The exhaust silencer comprises a third shell body and a stepped diameter changing exhaust pipe. The stepped diameter changing exhaust pipe comprises a first-order exhaust pipe, a second-order exhaust pipe and a third-order exhaust pipe which are arranged in an inserting mode, and the diameter of the first-order exhaust pipe, the diameter of the second-order exhaust pipe and the diameter of the third-order exhaust pipe sequentially become smaller. According to the diesel engine tail gas composite noise reduction device, the structure is compact, and space utilization is reasonable; not only can tail gas be filtered and purified, but also multi-frequency noise can be well eliminated; the effect that tail gas purification and noise reduction are conducted together is achieved, the structure is simple, the cost is low, the service life is long, assembling and disassembling are facilitated, and the tail gas purification efficiency and the noise elimination efficiency are high.

Description

technical field [0001] The invention relates to an exhaust noise reduction device, in particular to a diesel engine exhaust composite noise reduction 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] Exhaust gas treatment and noise reduction of diesel engines in the prior art are exhaust gas purification devices and mufflers working alone; performance and efficiency are relatively low; the main principle ...

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Problems solved by technology

[0003] Exhaust gas treatment and noise reduction of diesel engines in the prior art are exhaust gas purification devices and mufflers working alone; performance and efficiency are relatively low; the main principle of mufflers currently used for diesel engines is to use porous sound-absorbing materials to reduce noise. The sound-absorbing material is fixed on the inner wall of the airflow channel or arranged in a certain way in the pipeline to form a resistive muffler, which has a poor effect on low-frequency noise reduction, and the diesel engine exhaust contains more toxic gases and the PM content is too high. The environmental pollution is relatively serious, and the exhaust gas treatment system composed of a separately installed catalytic oxidation converter and a particulate capture device is relatively large, inconvenient to install and use, complex in structure, and not strong in pertinence

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