Novel high-efficiency BOG recovery system with cold storage function

Abstract

The invention discloses a novel high-efficiency low-energy consumption boil off gas (BOG) recovery process with cold storage function, and a device thereof. The device comprises a LNG storage tank, a nitrogen storage tank, a compressor, a first cold storage tank, an expansion machine, a BOG condensation recovery device, and a second cold storage tank. According to the device, nitrogen from the nitrogen storage tank is subjected to compression so as to obtain compressed nitrogen; and the compressed nitrogen is delivered through one of the cold storage tanks (which is processed via cold storage at a precooling preparing stage) for cooling, is delivered into the expansion machine after temperature reducing, is delivered into the BOG condensation recovery device for heat exchange with BOG gas after further temperature reducing so as to liquify BOG gas, and then is delivered through the other cold storage tank, and at last is delivered into the nitrogen storage tank after temperature increasing. The novel high-efficiency low-energy consumption boil off gas (BOG) recovery process is simple in process flow; some professional devices are not necessary; automatic controlling is realized; nitrogen can be recycled; waste caused by nitrogen discharging is reduced; investment is reduced; and industrial popularization and market application prospect is promising.

Description

technical field [0001] The patent of the invention relates to technical fields such as LNG (liquefied natural gas) storage, transportation and use, and is a new and efficient device for industrial recovery of BOG. Background technique [0002] my country has abundant reserves of natural gas resources, and the demand growth is accelerating. Compared with gasoline and diesel, LNG, as a power fuel for automobiles and ships, has good safety, environmental protection, and economic advantages. Implementation Plan for Overall Promotion of Emission Reduction") is also a key advantageous industry supported by the central government and the Development and Reform Commission ("The Outline of the Twelfth Five-Year Plan for National Economic and Social Development of the People's Republic of China", "National Development and Reform Commission's Proposal on Accelerating the Construction of Gas Storage Facilities instructions"). The main component of LNG is methane, which is gaseous at n...

AI Technical Summary

Problems solved by technology

At present, low-temperature oil-free reciprocating compressors are generally used. Domestic compressor manufacturers have no mature experience in designing and manufacturing such oil-free reciprocating compressors. They mainly rely on imports, and the statistical technical data and reliable operation of BOG compressor failure analysis Sexual information is not perfect

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