Recovery system for mixed refrigerant in process for preparing LNG (Liquefied Natural Gas) from Fischer-Tropsch synthesis tail gas

By designing a recycling system for mixed refrigerant in the Fischer-Tropsch synthetic exhaust gas LNG process, using multi-stage heat exchange and separation processes, the problems of complex refrigerant recycling processes and high energy consumption in the existing technology are solved, and the refrigerant recycling effect is achieved with high efficiency and low energy consumption.

CN119737735APending Publication Date: 2025-04-01CHINA ENERGY GRP NINGXIA COAL IND CO LTD +1
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Patent Information

Application Number
CN202411696552.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-25
Publication Date
2025-04-01

AI Technical Summary

Technical Problem

The refrigerant recycling process in existing liquefied natural gas devices has problems such as complex process flow and high energy consumption, resulting in incomplete refrigerant recycling, posing safety hazards and energy waste.

Method used

A recovery system for mixed refrigerant in the Fischer-Tropsch synthetic exhaust gas LNG process was designed, including multiple refrigerant recovery towers, compressors, heat exchangers and refrigerant separation components. Through multi-stage heat exchange and separation processes, the refrigeration cooling capacity of the cold box is fully utilized to realize the separate recovery of each component of the mixed refrigerant.

Benefits of technology

It effectively reduces the energy consumption of the refrigerant recycling system, improves the refrigerant recycling efficiency, reduces energy waste and environmental pollution, and improves the safety and economicality of the device.

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Abstract

The invention provides a recovery system for a mixed refrigerant in a process for preparing LNG (liquefied natural gas) from Fischer-Tropsch synthesis tail gas, which is characterized in that a heating loop A is arranged at the bottom of a first refrigerant recovery tower, and the heating loop A is provided with a first heat exchanger; the second refrigerant recovery tower is communicated with the first refrigerant recovery tower, the tower top of the second refrigerant recovery tower is provided with a cooling loop B, and the cooling loop B is provided with a sixth heat exchanger; the third refrigerant recovery tower is communicated with the second refrigerant recovery tower; a compression pipeline of the first compressor is communicated with the first heat exchanger, an outlet of the first heat exchanger is provided with a second heat exchanger, the second heat exchanger is communicated with the first refrigerant recovery tower through a refrigerant separation assembly, and a heat exchange medium in the second heat exchanger is a cold box backflow mixed refrigerant subjected to heat exchange through a sixth heat exchanger. According to the recycling system, the mixed refrigerant to be recycled is cooled by using all products in the cold box in the process of preparing the LNG from the Fischer-Tropsch synthesis tail gas and the cooling capacity of the backflow mixed refrigerant, the cooling capacity in the cold box is fully utilized, and the energy consumption of the recycling system is reduced.
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