Reciprocating piston type diesel engine in-cylinder high-temperature water supply system

Abstract

The invention relates to a reciprocating piston type diesel engine in-cylinder high-temperature water supply system. The system is used for supplying high-temperature water to the interior of a dieselengine main body and comprises a water tank, a heating water common rail communicating with the water tank, and a water sprayer communicating with the heating water common rail and the interior of the diesel engine main body. Normal temperature water in the water tank is changed into high-temperature water after being heated by the heating water common rail, and the high-temperature water is sprayed into the diesel engine main body. Compared with the prior art, by spraying the high-temperature water into a combustion chamber, the high-temperature water can absorb heat in the combustion chamber and does work by expansion, thus, the in-cylinder temperature is lowered, reduction of compression negative work and increase of expansion positive work are achieved, through the coupling action ofcompression negative work and expansion positive work, the working efficiency of a diesel engine is remarkably improved, the thermal efficiency of the diesel engine is improved by 8-20%, meanwhile, generation of nitrous oxides and particulate matter in the combustion process of the diesel engine is advantageously reduced through decrease of the in-cylinder temperature, and energy conservation andemission reduction of the diesel engine are promoted.

Description

technical field [0001] The invention belongs to the technical field of diesel engines and relates to a high-temperature water supply system in cylinders of reciprocating piston diesel engines. Background technique [0002] As a kind of internal combustion engine, diesel engine has the advantages of large torque, high compression ratio, and average fuel consumption is about 30% lower than gasoline engine, so its fuel economy is better. But because of the high compression ratio of the diesel engine, in order to ensure that the high explosion pressure generated during the combustion process will not damage the diesel engine body, the current diesel engine is generally made of cast iron, and its safety factor is more conservative than that of the gasoline engine. The greater weight causes it to rev lower and accelerate slower. The improvement of the thermal efficiency of a diesel engine is mainly limited by the compression ratio. The increase of the compression ratio will lead ...

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Problems solved by technology

Although such methods can reduce the pollutant emissions of diesel engines to a certain extent, their costs are greatly increased due to the addition of complex exhaust gas treatment devices and additional catalytic substances.

At the same time, due to the increase of the exhaust back pressure at the tail gas end, the residual exhaust gas rate in the combustion process in the cylinder increases, which has a significant inhibitory effect on the high-efficiency combustion in the cylinder, resulting in the deterioration of the fuel consumption performance of the diesel engine, which limits the application of the diesel engine

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