Mixed refrigerant recovery storage and component adjustment device for FLNG (floating liquefied natural gas)

Abstract

The invention discloses a mixed refrigerant recovery storage and component adjustment device for FLNG (floating liquefied natural gas). The device comprises a compressor, a cooler, a gas-liquid separator, a multi-stream heat exchanger, a separation tower, a storage tank, related connecting pipelines, valves and the like. A part of heavy components are separated after the mixed refrigerant is compressed and cooled, and a gas phase is separated into light components and the heavy components through deep cooling and rectification. Only the heavy components are recycled when the mixed refrigerant is recycled, the heavy components are sent back to the mixed refrigerant system through the pipeline when the system is started again, and light components are supplemented by BOG. When the mixed refrigerant is adjusted, the temperature and pressure of a rectifying tower are adjusted according to needs, and the needed components are separated out. According to the device, only the heavy components which cannot be self-supplied and are high in price are recycled, and the storage space of the mixed refrigerant is greatly reduced; and meanwhile, component adjustment of the mixed refrigerant can be conveniently and rapidly achieved, and the device has excellent economical efficiency and is very suitable for the FLNG with extremely high space requirements.

Description

technical field [0001] The invention relates to a refrigerant recovery storage and component adjustment device, in particular to a FLNG mixed refrigerant recovery storage and component adjustment device, which belongs to the technical fields of marine engineering and new energy. Background technique [0002] FLNG is a new type of floating production storage and unloading device that integrates the production, storage, loading and unloading of offshore liquefied natural gas. It is applied to the exploitation of offshore gas fields with low investment cost, short construction period, small development risk, easy migration and safety. Advanced features have attracted much attention in recent years. FLNG usually uses a mixed refrigerant refrigeration process to condense natural gas into LNG. Mixed refrigerants are generally composed of light components nitrogen, methane and heavy components ethane, ethylene, propane, propylene, butane, and pentane. The mixed refrigerant system...

AI Technical Summary

Problems solved by technology

[0003] Natural gas liquefaction plants on land usually discharge the mixed refrigerant directly to the mixed refrigerant storage tank, the recovery of the mixed refrigerant is incomplete, and the volume of the mixed refrigerant storage tank required is large

Not suitable for FLNG with extremely high space requirements

[0004] At the same time, in actual production, the composition of the mixed refrigerant needs to be adjusted according to the composition of the incoming natural gas. Most of the existing devices operate by discharging part of the mixed refrigerant and then adding a single component, resulting in the loss of the mixed refrigerant. , increasing operating costs

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