Natural gas engine, and combustion system and combustion method for natural gas engine

Abstract

The invention relates to the technical field of internal combustion engines, and discloses a natural gas engine, and a combustion system and a combustion method for the natural gas engine. The natural gas engine, the combustion system and the combustion method have the advantages that gas inlets of a part of cylinders of the natural gas engine are connected with natural gas supply equipment on the basis that a cooling EGR (exhaust gas recirculation) technology is applied to the natural gas engine, and excessive natural gas flows into the part of cylinders and is combusted to generate modified mixed gas containing H<2> and CO; exhaust ports of the part of cylinders are connected with a gas collecting cavity, the modified mixed gas is totally led into the gas collecting cavity, and the modified mixed gas and gas in the gas collecting cavity are mixed with each other and then flow into various cylinders to participate in combustion; a large quantity of hydrogen is contained in the gas which is modified by the part of cylinders, and can accelerate combustion of the mixed gas, so that the flammability limit of gas in the cylinders can be upgraded under the condition of a high EGR rate, NO<x> is reduced, the combustion temperature is lowered, knocking can be suppressed, the dynamic property and the economical efficiency of the engine can be improved, and the difficult problem of high heat load of an existing natural gas engine can be solved.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a natural gas engine combustion system and combustion method, and a natural gas engine. Background technique [0002] Natural gas is the clean energy with the largest reserves in the world. It is used in automobile engines, and the spark ignition mode has been widely used. In recent years, with the development and maturity of hydraulic fracturing technology and horizontal drilling technology, the recoverable natural gas reserves have grown rapidly, which will have an important impact on my country's energy development pattern. The use of natural gas engines can reduce particulate matter emissions by nearly 80%, and carbon dioxide emissions by 15-30%. [0003] For spark ignition, microwave ignition or compression ignition natural gas engines, the gas mixture in the traditional lean-burn mode cylinder releases a large amount of heat during combustion, which inc...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the existing natural gas engine has a large thermal load, low thermal efficiency and NO x high emissions

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