Precombustion chamber for marine large cylinder bore gas engine

Abstract

The invention provides a precombustion chamber for a marine large cylinder bore gas engine. The precombustion chamber comprises a precombustion chamber upper part and a precombustion chamber lower part; a precombustion chamber cavity is formed between the precombustion chamber upper part and the precombustion chamber lower part; two spark plugs are arranged at the precombustion chamber upper part; a fuel gas injection channel and two fuel gas injection channel outlets are formed in the precombustion chamber upper part; a flame jetting channel is formed in the precombustion chamber lower part; and the upper part of the precombustion chamber cavity is in an inverted omega shape. The precombustion chamber has the biggest characteristics that aiming to a working mode of the large cylinder bore gas engine, double spark plugs are configured in the precombustion chamber; and meanwhile, in order to reasonably organize air flow movement in the precombustion chamber, the upper part of the precombustion chamber cavity is designed into the inverted omega shape, the ignition stability of mixed gas in the precombustion chamber is improved, and stable combustion of fuel in a main combustion chamber is promoted.

Description

technical field [0001] The invention relates to a pre-combustion chamber of a gas engine cylinder, in particular to a pre-combustion chamber device for a marine large-bore gas engine used for igniting a lean mixture. Background technique [0002] For a gas engine, in order to increase its power density, the way of increasing the compression ratio is usually adopted, but increasing the boost ratio is likely to cause knocking, so it is necessary to achieve lean combustion in the cylinder. When the mixture is lean, the combustion speed decreases and the combustion duration prolongs, resulting in a decrease in engine thermal efficiency; if the mixture is too lean, flame quenching and misfire will occur, which will significantly increase the emission of unburned HC and reduce fuel economy. [0003] One of the ways to solve this problem is to increase the ignition energy, that is, to use the pre-chamber system to enhance the ignition capability. The entire combustion area is divi...

AI Technical Summary

Problems solved by technology

[0006] For marine large-bore gas engines, considering that the bore is large, the volume of the combustion chamber is increased, and the uneven distribution of the lean mixture is likely to cause misfires, so the main combustion chamber requires greater ignition energy, and the volume of the pre-combustion chamber also increases accordingly. , at this time, the propagation distance of the flame in the pre-combustion chamber is lengthened, resulting in slow combustion in the pre-combustion chamber, and then the flame injection speed decreases, which reduces the ignition energy in the main combustion chamber and affects the ignition stability of the engine

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