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...

Examples

Embodiment 1

[0029] Such as figure 1 As shown, a kind of marine gas engine high-pressure-stabilized injection system and control method according to the present invention adopts the technical scheme that includes a manual shut-off valve 1, a main gas fuel valve 2, a filter 3, an automatic breather valve 4, Automatic stop valve 5, pressure regulating valve 6, double wall gas rail 7, purge solenoid valve 8, gas injection valve 9, gas nozzle 10, cylinder 11 and supporting pipelines and multiple sensors;

[0030] The manual shut-off valve 1 and the main gas fuel valve 2 are arranged outside the bulkhead of the engine room; the main gas fuel valve 2 and the automatic shut-off valve 5 are normally closed and open when powered, and the automatic vent valve 4 is normally open and powered Closed type; the main gas fuel valve 2, the automatic shut-off valve 5 and the automatic vent valve 4 form a double cut-off breathable valve assembly, and the action of the double cut-off breathable valve assembly...

Embodiment 2

[0039] The difference from Embodiment 1 is that the high-pressure gas behind the pressure regulating valve can be adjusted and matched according to the characteristic requirements of the engine, and the sonic flow of the gas at the outlet of the gas injection valve 9 can be realized under the premise of satisfying the combustion performance. At this time, the gas flow rate and The gas pressure behind the pressure regulating valve 6 is linearly related, which can meet the precise control of the gas injection duration.

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...

Examples

Embodiment 1

[0029] Such as figure 1 As shown, a kind of marine gas engine high-pressure-stabilized injection system and control method according to the present invention adopts the technical scheme that includes a manual shut-off valve 1, a main gas fuel valve 2, a filter 3, an automatic breather valve 4, Automatic stop valve 5, pressure regulating valve 6, double wall gas rail 7, purge solenoid valve 8, gas injection valve 9, gas nozzle 10, cylinder 11 and supporting pipelines and multiple sensors;

[0030] The manual shut-off valve 1 and the main gas fuel valve 2 are arranged outside the bulkhead of the engine room; the main gas fuel valve 2 and the automatic shut-off valve 5 are normally closed and open when powered, and the automatic vent valve 4 is normally open and powered Closed type; the main gas fuel valve 2, the automatic shut-off valve 5 and the automatic vent valve 4 form a double cut-off breathable valve assembly, and the action of the double cut-off breathable valve assembly...

Embodiment 2

[0039] The difference from Embodiment 1 is that the high-pressure gas behind the pressure regulating valve can be adjusted and matched according to the characteristic requirements of the engine, and the sonic flow of the gas at the outlet of the gas injection valve 9 can be realized under the premise of satisfying the combustion performance. At this time, the gas flow rate and The gas pressure behind the pressure regulating valve 6 is linearly related, which can meet the precise control of the gas injection duration.

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