Fuel gas processing method for FLNG (floating liquefied natural gas) oil-gas storage and offloading device

Abstract

The invention relates to a fuel gas processing method for an FLNG (floating liquefied natural gas) oil-gas storage and offloading device. The method comprises the following steps: 1), multiple fuel gas sources are prepared; 2), a low-temperature compression system and a normal-temperature compression system are arranged, wherein the low-temperature compression system comprises a precooling device, a liquefying device, a throttle valve, an LNG storage tank and a low-temperature BOG (boil off gas) compressor, and the normal-temperature compression system comprises a precooling device, a liquefying device, a throttle valve, an LNG storage tank, three normal-temperature BOG compressors and three coolers; 3), the BOG obtained through high-pressure LNG throttling and flash evaporation, the BOG obtained through heat absorption and evaporation of the LNG storage tank and the BOG obtained through heat absorption and evaporation of an LPG (liquefied petroleum gas) storage tank are controlled to enter the low-temperature compression system, the fuel gas produced by condensate oil of a stabilizer and a small amount of fuel gas produced through deacidification are controlled to enter the normal-temperature compression system, a fuel gas low-temperature compression process and a fuel gas normal-temperature compression process are finished respectively; 4), technological process simulation software is adopted to calculate power consumption of each processing device and the total power consumption; 5), the processing process of the fuel gas sources is further optimized and analyzed. The fuel gas processing method can meet the operation requirement of the LFNG in a special maritime environment, and the operation safety and economy are improved.

Description

technical field [0001] The invention relates to a fuel gas processing method, in particular to a fuel gas processing method of a floating liquefied natural gas storage and unloading device. Background technique [0002] FLNG (floating liquefied natural gas production, storage and offloading device) is an offshore production facility that exploits natural gas from deep-sea gas fields and marginal gas fields and condenses it into LNG (liquefied natural gas). As a new development technology, FLNG has low investment, It is favored by many countries for its short construction period, easy migration, and environmental friendliness. As an independent FLNG, all processes and equipment must have the basic characteristics of land in principle. However, FLNG needs to consume a large amount of fuel gas to provide raw materials for gas turbines. The source and amount of fuel gas are directly related to the safe operation, energy consumption and economy of the entire FLNG. [0003] In ...

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Problems solved by technology

[0003] In addition, due to the relatively large energy consumption required by the entire FLNG process unit, it is also necessary to consider that the scale of the fuel gas treatment unit should meet the operating requirements of the special offshore environment and reduce the occupied space as much as possible. However, the fuel gas system of the existing The gas treatment method cannot meet the fuel supply requirements in the special offshore environment, so it is necessary to propose a new fuel gas system treatment method to provide fuel power for the FLNG oil and gas treatment device

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