Air-assisted gas injector, large-bore gas engine pre-combustion chamber combustion system and method

Abstract

The invention discloses an air-assisted gas ejector and a combustion system and method for a large-cylinder-diameter gas engine pre-combustion chamber. The air-assisted gas ejector comprises an ejector body, a compressed air pipeline, a high-combustion-speed gas pipeline and an ejector one-way valve. The compressed air pipeline and the high-combustion-speed gas pipeline communicate with each other on the ejector body, and the ejector one-way valve is arranged at the tail end of the ejector body. The air-assisted gas ejector and the combustion system and method for the large-cylinder-diameter gas engine pre-combustion chamber have the beneficial effects that the air-assisted gas ejector can conduct air scavenging by means of fresh air so as to lower the residual waste gas coefficient in the pre-combustion chamber, a gas-air mixture can be provided for the pre-combustion chamber at the same time, and the gas-air mixture approaching the stoichiometric ratio is formed in the pre-combustion chamber, so that the ignition reliability of the pre-combustion chamber is improved, flame propagation in a main combustion chamber is promoted, and the stability and power performance of a large-cylinder-diameter gas engine are improved.

Description

technical field [0001] The invention relates to the technical field of scavenging a pre-combustion chamber of a large-bore gas engine, in particular to an air-assisted gas injector, a combustion system and method for a pre-combustion chamber of a large-bore gas engine. Background technique [0002] At present, domestic large-bore gas engines are mostly upgraded and designed from corresponding diesel engines, and the combustion chamber structure is mostly shallow basin-shaped combustion chamber, with low compression ratio and low speed, and it is difficult to organize effective turbulent flow movement in the cylinder. However, natural gas has a low calorific value, long flame propagation distance in the combustion chamber, and slow combustion speed, especially under small load and lean combustion conditions, it is difficult to achieve rapid combustion of the mixture. [0003] Due to the slow flame propagation speed of the natural gas-air mixture, knocking is prone to occur at...

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Problems solved by technology

[0006] In order to solve the problems of high coefficient of residual exhaust gas in the pre-combustion chamber during the working process of the gas engine, the concentration of the combustible mixture is thin, and it is difficult to ignite, the present invention proposes an air-assisted gas injector and a large-bore gas engine pre-combustion chamber combustion system and method. Use the air-assisted injector to inject fresh air to scavenge the pre-chamber, reduce the residual exhaust gas coefficient in the pre-chamber, so as to make full use of the limited space of the pre-chamber

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