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System and method for reducing temperature of cooling water of gas engine through LNG (Liquefied Natural Gas) cold energy

A cooling water temperature, engine cooling technology, applied in the direction of engine cooling, engine components, engine control, etc., can solve the problem of cooling loss and other issues

Inactive Publication Date: 2015-07-08
JIANGSU UNIV
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Problems solved by technology

Patent CN 202812795 U proposes a LNG cold energy recovery and utilization system, which realizes the design of multi-stage and multi-pipeline LNG heat exchange, which improves the service life of the LNG vaporizer to a certain extent, but the exchange between the first and second pipelines There is a certain amount of cooling loss in heat

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  • System and method for reducing temperature of cooling water of gas engine through LNG (Liquefied Natural Gas) cold energy

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Embodiment Construction

[0028] Such as figure 1 As shown, a system that utilizes LNG cold energy to reduce the cooling water temperature 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. It is necessary to raise the temperature and adjust the pressure of the liquefied natural gas LNG to meet the injection requirements of the natural gas nozzle 20 .

[0029] The liquefied natural gas in the LNG storage tank 1 enters the large circulation heat exchanger 6 through the large circulation LNG supply pipeline A1; enters the small circulation heat exchanger 10 through the small circulation LNG supply pipeline B1. Before LNG enters any heat exchanger, it must pass through the high-pressure cut-off valve 4 and the manual valve 5 to automatically cut off the connection between the LNG storage tank 1 and the LNG supply pipeline when the pipeline pressure increases abnormally.

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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, in particular to a system for utilization of LNG cold energy of natural gas engines and its gasification. Background technique [0002] my country's oil resources are gradually becoming exhausted, and vehicle exhaust pollution is becoming more and more serious, which makes natural gas engines develop rapidly in our country. Among them, natural gas engines mostly choose to store fuel in LNG storage tanks in the form of liquefied natural gas, because the LNG filling time is short and the energy density per unit volume is high Left and right, so LNG vehicles can meet the needs of long-distance driving. At the same time, the storage pressure of LNG is 1.6MPa, and the storage pressure of CNG is higher than that of LNG, reaching 20MPa. The LNG pump pumps out the liquefied natural gas at -162°C from the storage tank, increases the pressure of the liquefied natural gas to 7.0-10.0MPa, and the tempera...

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Application Information

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