Natural gas oxygen-enriched combustion system capable of using liquefied natural gas (LNG) cold energy for air separation oxygen-making and carbon capture

Abstract

The invention relates to a natural gas oxygen-enriched combustion system capable of using liquefied natural gas (LNG) cold energy for air separation oxygen-making and carbon capture. The system comprises an LNG cold energy air separation oxygen-making subsystem, an oxygen-enriched high-pressure water-adding combustion cycle power generation subsystem and a high-pressure liquid oxygen carbon capture subsystem; the LNG cold energy is applied to the air separation oxygen-making process of a natural gas oxygen-enriched combustion power plant, and carbon dioxide produced by oxygen-enriched combustion is recovered by condensation at the same time, so that zero emission of carbon is realized. The problems that the oxygen-enriched combustion power plant is high in energy consumption of air separation oxygen-making and high in carbon capture cost can be solved. Furthermore, a high-pressure liquid nitrogen recycling oxygen-making subsystem is additionally arranged, so that liquid nitrogen cold energy is further utilized, and the oxygen-making energy consumption is reduced; therefore, system energy efficiency level is improved. After the natural gas oxygen-enriched combustion system is adopted, the cold energy is continuously transmitted and used, and the two problems that the oxygen-enriched combustion power plant is high in energy consumption of air separation oxygen-making and high in carbon capture cost can be solved; the natural gas oxygen-enriched combustion system can be used for an electric system taking LNG as fuel.

Description

technical field [0001] The invention belongs to the integrated system of a natural gas oxygen-enriched combustion power plant in the electric power industry, and specifically relates to an LNG cold energy air separation oxygen production subsystem, an oxygen-enriched high-pressure water-added combustion cycle power generation subsystem, a high-pressure liquid oxygen carbon capture subsystem and a high-pressure liquid nitrogen recirculation system. Oxygen system. Background technique [0002] At present, most of the power generation systems in the domestic and foreign power industries use air combustion, and coal is the main fuel. NO is formed in the combustion products x / SO x At the same time, a large amount of pollutants are burned, and a large amount of carbon dioxide is directly discharged into the atmosphere, causing the greenhouse effect; [0003] Natural gas oxygen enriched power plant can significantly reduce NO x / SO x emissions of pollutants and carbon capture...

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Problems solved by technology

[0004] The invention provides a set of natural gas oxygen-enriched combustion power plant integrated system that applies LNG cold energy to the process of air separation and oxygen production while realizing carbon capture, and solves the problems of high energy consumption, high cost of carbon capture and recovery in LNG oxygen-enriched power plants for air separation and oxygen production. The problem of large waste of LNG cold energy is of great significance to energy saving and emission reduction

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