Sewage treatment system using LNG cold energy

Abstract

The invention discloses a sewage treatment system using LNG cold energy. The system uses the LNG cold energy to directly and / or indirectly treat sewage; the indirect treatment mode is characterized inthat impurities are removed from the sewage through supercritical carbon dioxide extraction, and the corresponding system comprises a supercritical carbon dioxide sewage treatment device (12), an extract separator (13), an air separation system (9) and an oxygen-rich combustion system (10); and the direct treatment mode is characterized in that the sewage is treated through a freezing process, and the corresponding system comprises a freezing process sewage treatment device (4). The structure, the arrangement mode and the corresponding cold energy utilization mode of the key assemblies of thesystem are improved, the problem of limited sewage treatment using natural cold energy in the prior art is effectively solved, and the sewage treatment system also can be used together with an oxygen-rich combustion assembly, and has the advantages of full utilization of the LNG cold energy, realization of zero discharge of carbon, and good environmental protection effect.

Description

technical field [0001] The invention belongs to the technical field of LNG cold energy utilization and sewage treatment, and more specifically relates to a sewage treatment system using LNG cold energy, which corresponds to the way of directly utilizing LNG cold energy to treat sewage through freezing methods and / or indirectly using LNG There are two ways of cold energy to treat sewage through supercritical carbon dioxide. Background technique [0002] In recent years, under the background that countries around the world are actively strengthening environmental protection, the consumption of natural gas and its proportion in primary energy use have been continuously increasing. Natural gas will become one of the main energy sources in the 21st century. LNG (that is, liquefied natural gas) is one of the important ways of natural gas transportation at present. In the traditional gasification process, the cold energy carried by LNG is taken away by seawater or air, resulting i...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a sewage treatment system utilizing LNG cold energy, wherein the structure of its key components and its setting method, as well as the corresponding cold energy utilization method, etc. Improvement, compared with the existing technology, it can effectively solve the problem of limited natural cold energy sewage treatment, and the sewage treatment system can also be used with oxygen-enriched combustion components, which can not only make full use of LNG cold energy, but also realize zero carbon emissions, which is environmentally friendly good effect

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