Fuel gas supply system of double-fuel diesel engine

Abstract

The invention discloses a fuel gas supply system of a double-fuel diesel engine. The gas supply system comprises a gas inlet pipe, a pressure relief flame retardant device and a fuel gas common rail pipe, wherein the gas inlet pipe is provided with a gas inlet pressure sensor, the pressure relief flame retardant device is installed on the back sides of gas inlet manifolds of the gas inlet pipe, the fuel gas common rail pipe is fixedly arranged on the gas inlet pipe and is provided with a fuel gas inlet joint and a fuel gas common rail pipe pressure sensor, gas outlets are provided with fuel gas ejectors, and fuel gas jet tubes of the fuel gas ejector extend into the gas inlet manifolds of the gas inlet pipes corresponding to cylinders. The fuel gas supply system of the double-fuel diesel engine is compact and reasonable in structure, and the fuel gas jet tubes are arranged on the gas inlet manifolds corresponding to the cylinders, so that fuel gases are mixed in gas inlet passages of cylinder covers, and the response speed is high; each cylinder is capable of controlling the opening and closing of fuel gas through the corresponding fuel gas jet tube, so that scavenging loss in a valve overlapping time is eliminated.

Description

technical field [0001] The invention relates to the field of engines, in particular to a dual-fuel diesel engine gas supply system. Background technique [0002] The existing gas supply scheme for dual-fuel diesel engines is as follows: air enters the supercharger → the supercharged air enters the mixer → the gas in the gas pipeline enters the mixer → gas and air are mixed → the gas mixture passes through the throttle to control the flow → The gas mixture enters the intake pipe → The gas mixture enters the cylinder → A small amount of diesel pilot mixture is injected → The engine works [0003] The technical disadvantages of the existing gas supply scheme for dual-fuel diesel engines are: firstly, the air and gas need to be mixed in advance in the mixer before entering the engine, and the gas supply response lags behind; secondly, the air and gas enter the cylinder through the intake pipe after mixing, The gas mixture fills the intake pipe before entering the cylinder, caus...

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Problems solved by technology

[0003] The technical disadvantages of the existing gas supply scheme for dual-fuel diesel engines are: firstly, the air and gas need to be mixed in advance in the mixer before entering the engine, and the gas supply response lags behind; secondly, the air and gas enter the cylinder through the intake pipe after mixing, The gas mixture fills the intake pipe before entering the cylinder, causing scavenging when the valves overlap (when the intake valve and exhaust valve are opened at the same time, the fresh mixture entering the intake valve will inevitably be directly discharged from the exhaust valve ), leading to fuel loss, while the intake pipe is full of gas mixture, which is also prone to backfire

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