Diesel engine exhaust reforming stratified combustion system and control method

Abstract

The invention discloses a diesel engine exhaust reforming stratified combustion system and a control method, and belongs to the technical field of internal combustion engine combustion control. The system comprises a cylinder sleeve, a piston, a cylinder cover, an exhaust guide-in pipe and the like. Reformed gas produced by high temperature exhaust reforming is guided in through a spiral gas flue,the vortex motion condition formed in a cylinder can be effectively utilized, exhaust / reformed gas is thrown to the positions near the cylinder wall, a fuel gas mixture near the cylinder wall is promoted to catch fire at first, gas produced after exhaust / reformed gas mixed gas participates in combustion can be used as a heat insulation layer, and heat transfer losses to the cylinder wall in the whole combustion process are reduced. A catalyst is coated in a gas inlet flue, and reducing agents such as H2 and CO are generated. The heat release rate is increased, hydrocarbon increase is suppressed, H2O and CO2 which are generated after combustion can be used as an inhibitor in the combustion process, the overall specific heat capacity of a working medium of a high temperature zone is increased, increase of combustion temperature is suppressed, and nitric oxide generation amount is reduced. An air deflector is applied to a tangential gas flue with the main purpose of preventing air supplied to the tangential gas flue from entering an exhaust / reformed gas mixed gas zone of the outer side of a combustion chamber, thus, a center zone of the combustion chamber still has a high air content, and the generation amount of particulate matter is prevented from increasing in the later combustion period.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engine combustion control, and in particular relates to an exhaust gas reforming stratified combustion system and a control method. Background technique [0002] With the depletion of non-renewable energy and increasingly stringent environmental regulations, environmental sustainability has become an important guideline for the development of internal combustion engine technology. Due to the advantages of high thermal efficiency, good economy and wide power range, diesel engine has been widely used, but the emission problem of diesel engine is always the key factor restricting its development. For a long time, the application of a large number of new technologies has greatly reduced the emission of diesel engines. However, technical measures to improve economic efficiency often lead to worsening emissions. Therefore, how to ensure that the original emission is reduced while improving f...

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Problems solved by technology

[0003] The technical problem solved by the present invention: due to the working principle of the diesel engine, the diesel engine cannot be completely combusted, and the high-temperature exhaust gas discharged contains a large amount of incomplete combustion gas, nitrogen oxides and particulate matter, but the technical measures to improve the economy often lead to Emissions have deteriorated, so how to improve fuel economy while reducing original emissions is a key technical issue facing the development of diesel engines

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