LNG cold energy comprehensive utilization system

Abstract

The invention discloses an LNG cold energy comprehensive utilization system comprising an LNG storage center, an air separation system, a nuclear electricity generation system, a cold storage system and a gas supply pipe network. Two branches extend from the outlet end of the LNG storage center. The first branch is connected with the air separation system, and the second branch is connected with the nuclear electricity generation system. LNG in the LNG storage center conducts heat exchange through the air separation system and the nuclear electricity generation system correspondingly and thenenters the cold storage system. The LNG existing after heat exchange conducts heat exchange again with the cooling work medium of the cold storage system, then is fed into the gas supply pipe networkand is connected with gas users through the gas supply pipe network. The air separation system is used for obtaining liquid CO2. According to the LNG cold energy comprehensive utilization system, by means of the air separation system, the nuclear electricity generation system and the cold storage system, gradient utilization of LNG cold energy is achieved, energy waste caused by single use is avoided, the energy utilization rate is high, and the applicability is high; the LNG is used as cooling protection of the nuclear electricity generation system, so that safety and reliability are achieved; and meanwhile, the LNG cold energy comprehensive utilization system further has the features of being compact in structure, saving energy and being environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of LNG comprehensive utilization, and in particular relates to a system for comprehensive utilization of LNG cold energy. Background technique [0002] Liquefied natural gas (LNG) is a liquid in which normal pressure natural gas is compressed and cooled to about -162°C. It has the advantages of high energy density, high fuel calorific value, clean and environmental protection, etc. It is often stored in high-pressure steel cylinders; it needs to be gasified before use. Compressed natural gas will absorb a lot of heat in this process; while the production of LNG needs to consume a lot of energy, which itself stores high-grade cold energy and pressure energy. If the above energy is not recycled, it will be directly heated by seawater or air. Heating LNG is undoubtedly a huge loss, and at the same time, it will cause more or less cold pollution to the environment. [0003] Foreign countries have long used LNG ...

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Problems solved by technology

[0004] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a nuclear island self-cooling protection system based on LNG cold energy utilization to solve the technical problem of low LNG cold energy utilization in the prior art

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