Process for compact natural gas liquefying and floating production

A floating production and natural gas technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of poor applicability at sea, low efficiency, and small processing capacity of nitrogen expansion process, and achieve poor applicability, easy installation, The effect of reducing energy consumption

Active Publication Date: 2010-07-28
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] In order to overcome the defects of poor offshore applicability of the existing natural gas liquefaction technology and the small processing capacity and low efficiency of the conventional nitrogen expansion process, the purpose of the present invention is to propose a compact natural gas liquefaction floating production process, by utilizing the cold Realize the separation of heavy hydrocarbons, the modular design of the liquefaction process and the optimization of process operation parameters, which can be well applied to the LNG production in the marine environment

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  • Process for compact natural gas liquefying and floating production
  • Process for compact natural gas liquefying and floating production
  • Process for compact natural gas liquefying and floating production

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 As shown, it is assumed that the pressure of the pretreated natural gas is 5.0MPa and the temperature is 34.5°C. The liquefaction process consists of a propane precooling cycle, a double nitrogen expansion refrigeration cycle, natural gas deheavy hydrocarbons, and a liquefaction pipeline.

[0021] In the propane pre-cooling cycle, propane is compressed to 1.6MPa by propane compressors 8 and 10, and after each stage of compression, it is cooled to 35°C by water coolers 9 and 11, and the propane is completely liquefied, and then the pressure is reduced to 0.13MPa, the temperature drops to -36°C. At this time, the propane is a gas-liquid two-phase, and enters the heat exchange cold box 1 to pre-cool natural gas and nitrogen refrigerants.

[0022] In the nitrogen expansion refrigeration cycle, the high-pressure nitrogen is pre-cooled t...

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Abstract

The invention provides a process for compact natural gas liquefying and floating production and belongs to the field of chemical and cryogenic techniques. In the process, a modular design is adopted, and a liquefaction process consists of propane precooling circulation, double nitrogen expansion cooling circulation, natural gas heavy hydrocarbon removal and liquefaction pipe, wherein propane circulation is used for precooling natural gas and providing a nitrogen coolant; the double nitrogen expansion cooling circulation is used for deeply cooling and liquefying the natural gas; and the heavy hydrocarbon separation is realized by the cold energy generated in liquefaction. The process is suitable for producing liquid natural gas offshore and can prevent the influences of the shaking of a ship on a liquefying process.

Description

technical field [0001] The invention relates to a production process of liquefied natural gas (LNG), in particular, by using the cooling capacity in the liquefaction process to realize the separation of heavy hydrocarbons and the modular design of the liquefaction process, and at the same time by adopting the dinitrogen expansion design and process of precooling by propane The optimization of operating parameters has improved the efficiency, processing capacity and sea adaptability of the process, and is better suitable for LNG production in marine environments. Background technique [0002] my country's offshore natural gas resources are abundant, and the total geological resources are about 5.9 trillion cubic meters. However, my country's offshore natural gas resources are scattered and widely distributed in the Pearl River Mouth Basin, Yinggehai Basin, Qiongdongnan Basin, East China Sea Shelf Basin and Bohai Bay Basin, and a considerable part of them are deep-sea gas fiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 李玉星王武昌朱建鲁唐建峰林日亿刘永浩王伟伟
Owner CHINA NAT OFFSHORE OIL CORP
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