Natural gas liquefaction device and method capable of hydrocarbon removal and nitrogen removal synchronously

A liquefaction device, natural gas technology, applied in liquefaction, refrigeration and liquefaction, gas fuel, etc., can solve the problems of increasing LNG product volume, reducing denitrification operation energy consumption, etc., to reduce methane content, reduce device operation energy consumption, Effect of improving methane recovery rate

Pending Publication Date: 2020-10-16
四川科比科油气工程有限公司
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Problems solved by technology

[0004] The object of the present invention is to provide a natural gas liquefaction device and method for simultaneous dehydrocarbon and denitrogenation, which combines dehydrocarbon and denitrogenation, uses the stable flash gas of the deethanizer tower as

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  • Natural gas liquefaction device and method capable of hydrocarbon removal and nitrogen removal synchronously

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[0031] [Example 1]

[0032] Such as figure 1 As shown, a natural gas liquefaction device for simultaneous removal of hydrocarbons and nitrogen includes a cold box E1, a heavy hydrocarbon removal tower T1, a cryogenic separator V1, a nitrogen removal liquid separator V2, a deethane tower T2, a denitrification tower T3, Denitrogenation cycle compressor C2 and low temperature condensate pump P1; cold box E1 is connected to heavy hydrocarbon removal tower T1 and low temperature separator V1 respectively; the gas phase outlet of low temperature separator V1 is connected to cold box E1, cold box E1 and denitrification The tower T3 is connected; the heavy hydrocarbon removal tower T1 is connected to the deethanizer T2, the liquid phase of the cryogenic separator V1 is pressurized by the low temperature condensate pump P1 and then respectively connected to the heavy hydrocarbon removal tower T1 and the deethanizer T2; The gas-phase outlet of the alkane tower T2 is connected to the denit...

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Abstract

The invention discloses a natural gas liquefaction device and method capable of hydrocarbon removal and nitrogen removal synchronously. According to the scheme, hydrocarbon removal and nitrogen removal are combined, stable boil off gas of a deethanizer acts as nitrogen removal gas to extract gas, the stable boil off gas is liquefied synchronously when removing nitrogen, the problem of boil off gasremoval is solved, the product quantity of LNG is increased, and meanwhile the nitrogen removal operation energy consumption is lowered.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a natural gas liquefaction device and method for simultaneously removing hydrocarbons and nitrogen. Background technique [0002] Major oilfields in my country have reached the middle and late stages of development. In order to achieve stable production and enhanced oil recovery (EOR), nitrogen injection flooding technology is often used, so nitrogen also exists in large quantities in the application of nitrogen injection flooding as a measure to increase production. oilfield associated gas. Another feature of crude oil associated gas is that it is rich in various high-carbon alkanes, especially those above pentane, which have a certain content. In the process of LNG production, it is necessary to remove heavy hydrocarbon components to prevent blockage of the cold box, and also to remove nitrogen to prevent the phenomenon of "tumbling" in the process of LNG storage...

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Application Information

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IPC IPC(8): F25J1/02C10L3/10
CPCC10L3/101F25J1/0022F25J1/0228F25J3/0209F25J3/0233F25J3/0242F25J3/0257F25J2200/08F25J2200/74F25J2200/76F25J2200/78F25J2215/04F25J2245/02F25J2270/18F25J2270/66
Inventor 朱江陈志国罗兴刘敏
Owner 四川科比科油气工程有限公司
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