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

A dual-fuel engine, natural gas technology, applied in combustion engines, machines/engines, internal combustion piston engines, etc., can solve the problems of limiting the combustion boundary of dual-fuel engines, deterioration of engine economy and emissions, and unstable engine combustion. Achieve efficient and clean combustion, improve trade-off relationship, and avoid cold start difficulties

CN110318891AActive Publication Date: 2019-10-11HARBIN ENG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-10-11

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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.
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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...

Examples

Embodiment Construction

[0015] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0016] to combine Figure 1-3c , figure 1 It is a schematic diagram of the overall structure of the combustion control system of the ethanol / diesel dual-fuel engine in the present invention, including: cylinder head 11, intake valve 8, cylinder 12, exhaust valve 10, combustion chamber 13, turbocharger 14, natural gas low pressure Injection system, high pressure common rail fuel injection system and control system. The natural gas / diesel dual fuel engine in the present invention is equipped with two sets of fuel injection systems, that is, a natural gas low pressure injection system and a high pressure common rail fuel injection system. The natural gas low-pressure injection system includes a natural gas injection valve 7, a gas rail assembly 6, a gas consumption meter 5, a low-pressure filter 4, a pressure reducer 3, a natural gas pipeline 2, a gas cylinder 1 an...