Particulate matter removing device of marine heavy-duty diesel engine EGR system

Abstract

The invention provides a particulate matter removing device of a marine heavy-duty diesel engine EGR system and relates to the technical field of internal combustion engines. The particulate matter removing device comprises a conical turbine air outlet pipe, a shuttle containing cavity, screw blades, an EGR pipeline and an EGR valve. The conical turbine air outlet pipe, the shuttle containing cavity and a rear exhaust pipe are sequentially connected. The screw blades are arranged in the conical turbine air outlet pipe to form a helical duct through a screw blade fixing support. An air inlet of the EGR pipeline is formed in the shuttle containing cavity, an air outlet of the EGR pipeline is formed in a front air inlet pipe. Clean tail gas can be used as an air source of the EGR system, and pollution of particulate matter to a gas compressor and an engine air inlet system is reduced. The particulate matter removing device is reasonable in design, simple in structure, and suitable for EGR low pressure loop connection methods.

Description

technical field [0001] The invention relates to a particulate removal device for an EGR system of a marine heavy-duty diesel engine, in particular to a particulate removal device for an EGR system of a heavy-duty diesel engine with intake turbocharging and intake intercooling. Background technique [0002] Exhaust gas recirculation (EGR) technology has long been considered an effective measure to reduce NOx emissions. But when EGR technology is applied to diesel engine, it will bring some problems. Since the diesel engine adopts the direct injection compression ignition method in the cylinder, there is a diffusion combustion zone in the combustion of the mixture, which will lead to the formation of particulate matter, especially in marine diesel engines that use heavy fuel oil as the main fuel. High particulate matter emissions will not only pollute the atmosphere, but also cause blockage of the EGR system, wear of the intake valve and valve seat, and serious problems such ...

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Problems solved by technology

Increasing the injection pressure can improve oil-gas mixing and reduce particle emissions to a certain extent, but the improvement effect is limited when the load is high; the homogeneous compression ignition technology has its own defects such as difficult to effectively control the ignition time and large cycle fluctuations, and its experimental certification still needs to be completed. A certain period of time; DPF technology is a relatively mature particle removal technology, but on heavy-duty marine diesel engines, the existing DPF will be blocked quickly, resulting in increased exhaust back pressure, and the DPF needs frequent regeneration, which is not very practical

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