Fuel delivery method for internal combustion engine using gas-liquid two-phase natural gas as fuel

Abstract

The invention discloses a fuel delivery method for an internal combustion engine using gas-liquid two-phase natural gas as fuel. The liquid compressed natural gas source and the gaseous compressed natural gas source are transported to an adiabatic common rail through adiabatic transmission. The oiler is delivered to the cylinder: the fuel entering the adiabatic common rail (5) has two paths: a liquid path and a gas path: the liquid is delivered to the adiabatic common rail (5) through a liquid compressed natural gas cylinder (1) rail (5); the gas route enters the adiabatic common rail (5) through the gaseous compressed natural gas cylinder (7) through the corresponding pipe valve. The invention enables the gas-liquid two-phase natural gas to flash and boil when it enters the cylinder, and performs real-time design control of the gas-liquid components of the two-phase natural gas under different working conditions. Because the gas-liquid two-phase natural gas is burned, CO, CO2, and PM emissions are low, and there is no NMHC; the compression process injection is used, and the HC emissions are low; the cylinder temperature is low, and the NOX emissions are low; it has extremely low emissions.

Description

[0001] Field [0002] The invention relates to a combustion system structure of an internal combustion engine, in particular to a combustion system using natural gas as fuel. Background technique [0003] In the current natural gas internal combustion engine, whether it is the central single-point injection at the intake manifold, the multi-point injection at the intake manifold or the direct injection in the cylinder with the nozzle installed on the cylinder head, the injected fuel is all gaseous natural gas. In a non-direct injection natural gas engine, the calorific value of the mixture of natural gas and air is 12% lower than that of diesel and air; at the same time, natural gas enters the cylinder in a gaseous state, occupying a certain cylinder volume, so that the air intake ratio About 10% less when using liquid fuel. In-cylinder direct-injection natural gas internal combustion engine uses natural gas to enter the cylinder at the end of the intake stroke. Although thi...

AI Technical Summary

Problems solved by technology

Therefore, the intake air temperature of the current natural gas engine is high, the heat load of the combustion chamber parts is high, and the NO X It will be generated in large quantities under the condition of high temperature and rich oxygen, so it is not conducive to improving reliability and reducing emissions

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