A kind of LNG regasification and liquid air preparation system and working method

Abstract

The invention discloses an LNG regasification and liquid air preparation system, which comprises an LNG regasification subsystem, an air liquefaction subsystem and a reheating subsystem. The LNG regasification subsystem and the air liquefaction subsystem perform heat exchange through the LNG vaporizer, and the LNG regasification subsystem and the reheat subsystem perform heat exchange through a heat exchanger. The LNG regasification subsystem consists of sequentially connected liquid storage tanks, submersible pumps, liquid outlet valves, LNG vaporizers, and heat exchangers; the air liquefaction subsystem includes sequentially connected air cleaners, compressor units, LNG gas The carburetor and gas-liquid separator etc.; the reheat subsystem consists of sequentially connected compressor units, circulation pumps and heat exchangers. The invention utilizes the liquid air preparation process to recover and store the cold energy released in the LNG regasification process, thereby reducing energy waste in the LNG regasification process. The invention also discloses a working method of the LNG regasification and liquid air preparation system.

Description

technical field [0001] The invention relates to an LNG regasification and liquid air preparation system and process, belonging to the field of energy recovery and utilization. Background technique [0002] For a long time, my country's dependence on coal has been very high. With my country's continuous attention and optimization of climate issues and energy structure, China has paid more and more attention to the development of the LNG industry. my country's natural gas demand has experienced rapid growth for more than ten years. The huge demand has made domestic natural gas production in short supply, and it has become an inevitable option to rely more on LNG imports. The LNG transported from overseas needs to be received by the receiving station. At the LNG receiving station, the LNG needs to be gasified before use. During the gasification process, a large amount of cold energy will be released, about 830-860kJ / kg. If the cold energy is not utilized, it will cause a huge ...

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Problems solved by technology

However, the system produces solid ice through multiple heat exchanges, which leads to a complex system structure. The existence of intermediate media increases the number of heat transfers and increases the energy loss in the heat transfer process; All the cold energy released by gasification; and the freezing problem may occur during the water pre-cooling process, which will affect the stable operation of the system

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