Diesel, dimethylether mixed injection system

Abstract

The system includes fuel injector, dimethyl ether needle valve, dimethyl ether, check valve, compression cavity for dimethyl ether, drive piston, drive cavity, slide valve, diesel oil pump, storage tank for dimethyl ether etc. Diesel oil pump through slide valve is connected to drive cavity so as to form system for driving dimethyl ether. Diesel oil pump provides diesel oil for fuel injector. Dimethyl ether from storage tank through check valve and needle valve is provided for fuel injector. Refluent diesel oil on upper part of the fuel injector reenters into spraying system for playing lubrication. In the invention, diesel oil supply system provides diesel oil and as a driving system for dimethyl ether. Mixed fuel is formed inside fuel injector. Dimethyl ether is not needed to pass through oil pump, and high-pressure nitrogen tank is also not needed. Wear problem is also solved in the invention.

Description

technical field [0001] The invention relates to an injection system of an internal combustion engine, in particular to a mixed injection system of diesel oil and dimethyl ether, and belongs to the technical field of internal combustion engines. Background technique [0002] Compression-ignition engines generally use diesel as fuel, and have been highly valued by people because of their high thermal efficiency. But it emits high levels of harmful soot and nitrogen oxides. People have taken many technical measures to reduce their emissions, but it is difficult to reduce them at the same time. As an emerging clean alternative fuel, dimethyl ether has a high cetane number, no C-C bond in its molecular structure, and good atomization performance. Combustion on a compression ignition engine can completely eliminate soot emissions, effectively Reduce nitrogen oxide emissions and reduce noise. Due to the large output of diesel oil, it dominates the fuel consumption of compression ...

AI Technical Summary

Problems solved by technology

In the prior art, the document "Experimental Research on Direct Injection Diesel Engine Blending Dimethyl Ether" ("Wuhan Shipbuilding", No. 5, 2000, author: Ding Heqing, etc.) introduces the use of diesel oil and dimethyl ether in direct injection diesel engines. The mixed fuel adopts the combustion system and fuel injection system of the original engine, and the fuel tank and low-pressure oil circuit are modified. The mixed fuel of diesel and dimethyl ether is prepared in advance and packed in a sealed container. The fuel tank is pressurized to keep the dimethyl ether in a liquid state. Due to the complexity of the device, the mixed fuel needs to be prepared in advance, and nitrogen at 10 atmospheres is required. The use cost is high and it is not suitable for the practical application of compression ignition engines.

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