Multi-mode combustion organization method of natural gas/diesel oil dual-fuel engine

Abstract

The invention aims to provide a multi-mode combustion organization method of a natural gas / diesel oil dual-fuel engine. Natural gas used as a low-reaction-activity fuel is injected into a gas channelby a natural gas low-pressure injection system, is preliminarily mixed with air in a gas inlet channel and enters a gas cylinder through a gas inlet valve; diesel oil used as a high-reaction-activityfuel is directly injected into the gas cylinder by a high-pressure common-rail fuel injection system; after the diesel is spontaneously combusted, the mixed gas with the natural gas and the air is ignited so as to supply power to the engine. According to the multi-mode combustion organization method of the natural gas / diesel oil dual-fuel engine, through independent or collaborative control of thehigh-pressure common-rail fuel injection system and the natural gas low-pressure injection system, multi-mode combustion of the natural gas / diesel oil dual-fuel engine can be achieved under differentconditions, so that the engine can operate more flexibly; the problems of difficult cold starting, high emission of low-load THC and high-load knocking can be avoided; and reliable operation and efficient and clean combustion of the engine can be achieved.

Description

technical field [0001] The invention relates to an engine combustion method, specifically a dual-fuel engine combustion method. Background technique [0002] At present, traditional petroleum is still used as the main fuel for internal combustion engines, especially for ships, but increasingly scarce oil resources, increasingly serious environmental problems and increasingly stringent emission regulations all pose great challenges to the development of internal combustion engines for ships. Therefore, more and more scholars pay attention to finding clean alternative fuels and improving fuel utilization. Natural gas has become the most promising alternative energy source due to its advantages such as wide sources, high calorific value, and less pollution. Therefore, natural gas-diesel dual fuel is often used in compression ignition engines. [0003] However, the traditional combustion method of natural gas / diesel dual-fuel engine determines that there is a trade-off relatio...

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Problems solved by technology

Excessive natural gas substitution will also cause problems such as unstable combustion of the engine under small and medium loads, serious THC emissions, and knocking combustion under heavy loads, and improper control of the combustion phase will also cause rough engine work, deteriorating engine economy and emissions , thus limiting the combustion boundary of the dual-fuel engine

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