Dual compounding cryogen refrigeration system with a precooling function and method

A refrigeration system and composite refrigerant technology, applied in the direction of refrigeration and liquefaction, liquefaction, solidification, etc., can solve the problems of rising natural gas, increasing raw material costs, and decreasing profit margins of liquefaction plants, and achieves small effective energy loss, uniform temperature difference, and system The effect of rich adjustment means

Inactive Publication Date: 2013-02-13
CHINA GASOLINEEUM ENG
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Problems solved by technology

However, due to the impact of international crude oil prices, natural gas prices continue to rise, and the benefits of natural gas liquefaction plants The

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  • Dual compounding cryogen refrigeration system with a precooling function and method

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Embodiment Construction

[0028] The present invention uses multi-stage precooler evaporators for precooling, and the more stages used for precooling (that is, the number of precooler evaporators), the more energy consumption is saved. But from the perspective of operation and economic investment, level 4 is the most reasonable. Using four-stage pre-cooling can save 10% of the power of the pre-cooling compressor compared with three-stage pre-cooling. Therefore, the present invention will be described in detail by taking the four-stage precoolant evaporator as an example:

[0029] A dual compound refrigerant refrigeration system with precooling, such as figure 1 As shown, including: precoolant compressor 1, precoolant cooler 2, precoolant separator 3, high pressure precoolant evaporator 4, medium pressure precoolant evaporator 5, low pressure precoolant evaporator 6 , Low and low pressure precoolant evaporator 7, MR1 compressor 8, MR1 cooler 9, liquefaction main low temperature heat exchanger 10, MR2 ...

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Abstract

The invention discloses a dual compounding cryogen refrigeration system with a precooling function and a method. The temperature of purified natural gas is gradually decreased in four evaporators and two heat exchangers until that the purified natural gas is liquefied, the cold quantity required by the liquefaction process is provided by three systems, namely, a precoolant system, a mixing cryogen MR1 and a mixing cryogen MR2, system adjustment means are abundant so as that the cold quantity can be fully provided for the natural gas liquefaction process, and the flexibility of the system on the aspects of the operation and the adaptability to a raw material are shown. According to the refrigeration system and the method provided by the invention, the energy consumption during the natural gas liquefaction process is low, the domestic production for a large-scale liquification factory is free from the mode limitation by a main heat exchanger, the large-scale refrigeration compression can be realized, and an LNG (liquefied natural gas) device with ten millions tons can be realized to the greatest degree..

Description

technical field [0001] The invention relates to a natural gas liquefaction process, in particular to a double composite refrigerant refrigeration system and method with precooling. Background technique [0002] LNG is clean and environmentally friendly, and it has been rapidly promoted in many application fields such as urban gas, industrial fuel, urban gas peak shaving and accident emergency, gas vehicles, and high-end porcelain processing in areas without natural gas pipelines. However, due to the impact of international crude oil prices, the price of natural gas continues to rise, and the cost of raw materials for natural gas liquefaction plants continues to increase, resulting in a continuous decline in the profit margins of liquefaction plants. In recent years, natural gas liquefaction plants at home and abroad have developed towards large-scale and large-scale development. At present, the maximum liquefaction capacity of a single set has reached 7.8 million tons per ye...

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Application Information

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IPC IPC(8): F25J1/02F25J5/00
CPCF25J1/0022F25J1/0263F25J1/0292F25J1/0218F25J1/0052F25J2250/02
Inventor 刘家洪孙林宋德琦蒲黎明龙增兵陆永康陈运强法玉晓郭成华仲文旭陈磊许涛钟志良琚宜林
Owner CHINA GASOLINEEUM ENG
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