Fuel valve and method for spraying gas fuel into combustor of spontaneous combustion type internal combustion engine

Abstract

A fuel valve for spraying a gas fuel into a combustor of a spontaneous combustion type internal combustion engine includes a long and thin fuel valve shell with a rear end and a front end; a nozzle having a plurality of nozzle holes leading to a needle valve pressure chamber in the nozzle and arranged at the front end of the long and thin fuel valve shell; a gas fuel inlet port arranged in the long and thin fuel valve shell and connected to a high pressure gas fuel source; an axially movable valve needle slidingly housed in a longitudinal hole of the long and thin valve shell and having a closing position and an opening position, wherein the axially movable valve needle is placed on a valve base in the closing position and is lifted from the valve base in the opening position, and a fluid in the combustor is connected to the gas fuel inlet port; an actuating system used for controllably moving the axially movable valve needle between the closing position and the opening position; an ignition liquid inlet port used for connection to a high pressure ignition liquid source; and an ignition liquid supply conduit which connects the ignition liquid inlet port to the combustor and also includes a fixation flow limiter.

Description

technical field [0001] The present invention relates to a gaseous fuel valve for a self-igniting internal combustion engine with a gaseous fuel supply system, and more particularly to a gaseous fuel valve for a large low speed single-flow turbocharged two-stroke internal combustion engine with a gaseous fuel supply system. Background technique [0002] Large, low-speed two-stroke self-ignition (diesel) engines of the crosshead type are commonly used in the propulsion systems of large ships or as prime movers in power plants. Very often, these engines run on heavy fuel oil or heating oil. [0003] Currently, there is a need for large two-stroke diesel engines that can accommodate alternative types of fuels, such as gas, coal slurry, petroleum coke, etc., especially natural gas. [0004] Gaseous fuels such as natural gas when used as fuel for large low-speed single-flow turbocharged two-stroke internal combustion engines produce significantly lower levels of sulfur compounds ...

AI Technical Summary

Problems solved by technology

This small dosage of a full-scale fuel injection system that is also able to deliver the large quantities necessary to operate at full load poses significant technical problems and is very difficult to achieve in practice and therefore in existing engines the pilot oil dosage is already at each Oil injection events have a greater number than desired especially at medium and low loads

The alternative of an additional small injection system that can handle small pilot numbers is quite complicated and expensive

Also, the extra small pilot oil injection valve makes the head of the block even more congested

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