Mixed refrigerant recovery and reinjection process and device

Abstract

The invention relates to a mixed refrigerant recovery and reinjection process in a natural gas liquefying device. The process includes the steps of adding a special channel to a fin type heat exchanger, wherein the special channel is used for recovering mixed refrigerant in a refrigerant circulating system; arranging a special device and a special pipeline to reinject the mixed refrigerant into a refrigerant system. The mixed refrigerant recovery and reinjection process and device are suitable for recovering and reinjecting the refrigerant when the refrigerant liquefying device is stopped and started again and recovering and reinjecting the refrigerant when the refrigerant ratio is adjusted, and the problems that refrigerant recovery is difficult, and the liquefying device is poor in variable-working-condition adaptive capacity are solved.

Description

technical field

[0001] The invention relates to a process and device for recovering and reinjecting mixed refrigerant, in particular to a process and device for recovering and reinjecting mixed refrigerant in a natural gas liquefaction device when the mixed refrigerant liquefaction device is shut down or when the refrigerant ratio is adjusted. Background technique

[0002] The natural gas liquefaction process adopted by the natural gas liquefaction plant has several different types, which can be divided into the following three types according to the refrigeration method: cascade liquefaction process, mixed refrigerant liquefaction process, and liquefaction process with expander. The cascade liquefaction process has the lowest energy consumption, but has many moving equipment and complicated operation; the liquefaction process with an expander has the disadvantages of high energy consumption and relatively complicated operation; the advantage of the mixed refrigerant liquefac...

Images