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System and method for reducing cooling water temperature of natural gas engine by using lng cold energy

A technology of cooling water temperature and engine cooling, applied in the direction of engine cooling, engine components, engine control, etc., can solve problems such as cooling loss

Inactive Publication Date: 2017-10-20
JIANGSU UNIV
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  • Application Information

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Problems solved by technology

Patent CN202812795 U proposes a LNG cold energy recovery and utilization system, which realizes multi-stage and multi-pipeline LNG heat exchange design, which improves the service life of the LNG vaporizer to a certain extent, but the heat exchange between the first and second pipelines There is a certain cooling loss

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  • System and method for reducing cooling water temperature of natural gas engine by using lng cold energy

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Embodiment Construction

[0027] The present invention will be further described below with reference to the drawings and specific embodiments, but the protection scope of the present invention is not limited to this.

[0028] Such as figure 1 As shown, a system that uses LNG cold energy to reduce the temperature of cooling water of a natural gas engine includes an LNG supply system, an engine cooling system and an engine body. In the LNG storage tank 1, the pressure is 1.6 MPa and the temperature is -162° C. The liquid natural gas LNG needs to be heated and adjusted to meet the injection requirements of the natural gas nozzle 20.

[0029] The liquid natural gas in the LNG storage tank 1 enters the large-cycle heat exchanger 6 through the large-cycle LNG supply line A1; and enters the small-cycle heat exchanger 10 through the small-cycle LNG supply line B1. Before LNG enters any heat exchanger, it must pass through the high-pressure shut-off valve 4 and manual valve 5 to automatically cut off the connectio...

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Abstract

The invention belongs to the field of gas engines and particularly relates to a system and a method for reducing the temperature of the cooling water of a gas engine through the LNG (Liquefied Natural Gas) cold energy. A large circulation supply pipeline and a small circulation pipeline are arranged in an LNG supply system and a large circulation heat exchanger and a small circulation heat exchanger are arranged in the two pipelines in an additional mode respectively; the temperature of the circulating water can be reduced through the LNG cold energy and the self-temperature of the circulating water is utilized through each heat exchanger to serve as an LNG gasifier; the two-stage utilization on the LNG cold energy is achieved due to the fact that an engine cooling system is corresponding to different working conditions of the engine and accordingly the rapid use on the gas supply of the gas engine and the temperature of the cooling water is facilitated so as to achieve the dynamic balance. The gas engine which is modified from a diesel engine is simple in modification, high in cold energy utilization rate and broad in application prospect.

Description

Technical field [0001] The invention belongs to the field of natural gas engines, and particularly relates to a system for utilizing LNG cold energy of natural gas engines and its gasification. Background technique [0002] my country's petroleum resources are gradually depleting, and the pollution of automobile exhaust emissions is increasing, which makes natural gas engines develop rapidly in my country. Among them, natural gas engines mostly choose to store fuel in LNG storage tanks in the form of liquid natural gas, because LNG filling time is short, and the unit volume energy density of LNG vehicle storage tanks with the same volume is 3 times that of CNG tanks. Therefore, LNG vehicles can meet the needs of long-distance driving. At the same time, LNG storage pressure is 1.6MPa, and CNG storage pressure is higher than LNG, reaching 20MPa. The LNG pump pumps out the liquefied natural gas of -162℃ from the storage tank, increases the pressure of the liquefied natural gas to ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D19/02F02M21/02F02M21/06F02D41/00F01P7/14
CPCY02T10/30
Inventor 戴礼明王谦何志霞谭小强韩丹
Owner JIANGSU UNIV