Marine gas machine high pressure-stable pressure injection system and control method

Abstract

The invention relates to a marine gas machine high pressure-stable pressure injection system and a control method. According to the adopted technical scheme, a manual stop valve, a double-stop ventilation valve assembly, a filter, a pressure regulating valve, a double-layer wall gas rail, a purging electromagnetic valve, a gas injection valve, a gas nozzle, an air cylinder, a matched pipeline and a plurality of sensors; and the double-stop ventilation valve assembly comprises a main gas fuel valve, an automatic stop valve and an automatic ventilation valve, and is used for being matched for adjusting and controlling the pressure of the high-pressure gas. The marine gas machine high pressure-stable pressure injection system has the beneficial effects that the dynamic responsiveness of an engine is improved, the average molar stable value of methane in mixed gas is improved through high-pressure gas injection, the lean-burn upper limit of the engine is further improved, and pollutant emission is reduced. The high-power requirement can be met by adopting high-pressure gas injection and matching with the small-specification gas injection valve, and by adopting stable-pressure injection, the supply pressure consistency before each injection valve is ensured, the combustion consistency of each cylinder and the air-fuel ratio control accuracy of each cylinder are improved, and fire and knocking of a single cylinder are avoided.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, in particular to a marine gas fuel engine, in particular to a high-pressure-stabilized injection system and a control method for a marine gas engine. Background technique [0002] National environmental protection and shipping departments have put forward higher requirements for ship engine emissions. The main power of my country's inland river and offshore ships is diesel engines, and the NOx, SOx and particulate matter emitted by them have become one of the main pollution sources of rivers and the surrounding ecological environment. From July 2021, the country will implement emission restrictions in accordance with the second stage (hereinafter referred to as C2) of GB15097-2016 "Limits and Measurement Methods of Exhaust Pollutants from Ship Engines (China's First and Second Stages)" and use LNG instead Traditional diesel fuel has become the most realistic and effective sol...

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Problems solved by technology

[0003] The marine gas engine has developed rapidly in recent years. In the early stage, the pre-mixed gas engine was mainly used to realize the clean combustion of fuel, but the dynamic response was poor, methane escape and HC emission concentration were high, and it was difficult to meet the high dynamic response and C2 emission standard requirements

[0004] In the prior art, the patent 201710409480.0 is a gas supply system for LNG natural gas engines. The air and gas are adjusted separately, and then enter the cylinder after being mixed by a mixer. The air-fuel ratio is precisely controlled, and the mixed gas is far away from the cylinder, resulting in slow dynamic response; patent 201910116776.2 discloses a gas supply system for marine dual-fuel engines, which uses gas valve group units and double-layer pipes to complete the gas supply, and only solves the problem of gas leakage. coming risk

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