Closed supercritical carbon dioxide power generation system and method with carbon capture utilization and fuel gas circulation waste heat utilization

Abstract

The invention provides a closed supercritical carbon dioxide power generation system and method with carbon capture utilization and fuel gas circulation waste heat utilization. The closed supercritical carbon dioxide power generation system comprises a high-pressure turbine, a low-pressure turbine, an electric generator, a high-temperature heat regenerator, a low-temperature heat regenerator, a precooler, a carbon dioxide compressor, a coal economizer, a low-temperature superheater, a high-temperature superheater, a combustor, a waste heat recoverer, a carbon dioxide recovery device, a carbondioxide high-pressure pump, an ammonia liquid high-pressure pump, a urea synthesis tower, a flash tank and a urea storage tank. According to the system, natural gas serves as a fuel, a pure oxygen combustion mode is adopted, and full capture of carbon dioxide in smoke is implemented by the carbon dioxide recovery device; supercritical carbon dioxide expands in the high-pressure turbine and the low-pressure turbine to do work, and such mode enables the turbines to output more work, so that the circulation efficiency is improved; and in addition, the power generation system is associated with industrial preparation of urea, namely, the carbon dioxide is used as a raw material for urea preparation after being fully captured, after being pressurized, ammonia liquid enters the waste heat recoverer to absorb waste heat of the smoke and enters the urea synthesis tower together with the captured and recovered carbon dioxide, and generated urea is processed by a flash evaporation process to obtain the finished product. In the process, not only is circulation waste heat of the supercritical carbon dioxide effectively utilized, but also capture utilization is implemented on the carbon dioxidein the smoke, and thus, environmental friendliness is shown, and clean and green power supply is implemented.

Description

technical field [0001] The invention belongs to the technical field of supercritical carbon dioxide thermal power generation, and relates to a closed supercritical carbon dioxide power generation system and method with carbon capture utilization and gas cycle waste heat utilization. Background technique [0002] With the rapid development of the national economy and the rapid improvement of the country's industrialization level, the demand for electricity is increasing. How to use energy efficiently has become the focus of common attention of scholars from all over the world. At present, for the traditional steam Rankine cycle power generation system, due to the limitation of materials and other issues, it is difficult to further improve the power generation efficiency. Under the same temperature conditions of the turbine inlet working fluid, the supercritical carbon dioxide Brayton cycle can achieve higher power generation efficiency. [0003] Supercritical carbon dioxide ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a closed supercritical carbon dioxide power generation system and method with carbon capture utilization and gas cycle waste heat utilization, which not only effectively improves the efficiency of the generator set, but also realizes the capture and utilization of carbon dioxide in the flue gas, overcoming the traditional power generation Defects of industry polluting the environment

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