System utilizing normal temperature compressor to process low temperature gas
A low-temperature gas and compressor technology, applied in mechanical equipment, machines/engines, liquid variable displacement machinery, etc., can solve the problems of high manufacturing costs and achieve the effect of reducing investment and maintenance costs
Active Publication Date: 2015-06-17
国鸿液化气机械工程(大连)有限公司
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Problems solved by technology
[0005] The compressor that can directly inhale low-temperature gas is a special compressor. The low-temperature end material needs to meet the low-temperature requirements, and the manufacturing cost is very high.
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[0016] figure 1 A system for processing cryogenic LNG boil-off gas with one stage of heating and compression is shown. In the figure, the LNG boil-off gas from the LNG liquid tank flows through the first heat exchanger 1 from the LNG boil-off gas inlet 6, and then enters the first-stage normal temperature compressor 2 to be compressed. The temperature regulating valve 4 controls, or flows through the first heat exchanger 1 to heat the LNG boil-off gas that enters from the LNG boil-off gas inlet 6, and then enters the rear heat exchanger 5, or directly enters the rear heat exchanger 5. After being cooled again in the cold rear heat exchanger 5, it is discharged from the LNG outlet 7.
[0017] The inlet parameter of LNG evaporated gas is -140°C, 1.10bar absolute pressure (design working condition). After being heated by the first heat exchanger 1, the outlet parameter is +5°C, 1.08bar absolute pressure. After one-stage normal temperature compression, After compression, the par...
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A system utilizing a normal temperature compressor to process low temperature gas is used for gas fuel feeding of ship engine room power plants, cargo loading and unloading gas phase operation, liquefied natural gas (LNG) fuel injection gas phase operation, liquid cargo lightering among storage holds or cargo holds, and the like. The system utilizes the normal temperature compressor to compress LNG evaporation gas from an LNG liquid tank, inlet gas of the normal temperature compressor is the LNG evaporation gas heated by a heat exchanger from the LNG liquid tank, exhaust gas of the normal temperature compressor enters the heat exchanger to heat the LNG evaporation gas from the LNG liquid tank, and the LNG evaporation gas from the LNG liquid tank can adopt a primary heating and compression, a secondary heating and compression or a triode heating and compression. According to the system, the exhaust gas of the normal temperature compressor is utilized to heat the low temperature LNG evaporation gas from the LNG liquid tank, so that an adiabatic compression working condition line on a P-H graph moves to the right, investment to devices and maintenance cost are reduced, the compressor can suck normal temperature gases, and outlet parameters of the system can be the same as or similar to those of a system utilizing lower temperature compressor.
Description
technical field [0001] The invention relates to a system for treating low-temperature gas with a normal-temperature compressor, which is used for gas fuel supply of ship engine room power equipment, gas phase operation of loading and unloading cargo, gas phase operation of LNG fuel filling, liquid cargo barge between storage tanks or cargo tanks, etc. Background technique [0002] In recent years, with the increasingly serious air pollution, the global control of gas emissions from ships has become increasingly strict. Developed countries such as Europe and the United States have established their own control areas to meet Tier II and Tier III emission standards within the specified time. In order to solve the serious pollution problem of the Yangtze River and Pearl River waters, the Chinese government planned the "Gasification of the Yangtze River" and "Gasification of the Pearl River" projects in the 12th Five-Year Plan. [0003] The use of natural gas for ships can reduc...
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IPC IPC(8): F04B37/08
Inventor 刘国满
Owner 国鸿液化气机械工程(大连)有限公司