Supercritical carbon dioxide semi-closed pure oxygen combustion power generation system based on staged combustion

Abstract

A supercritical carbon dioxide semi-closed pure oxygen combustion power generation system based on staged combustion comprises a fuel supply system, an oxygen supply system, a power generation system,and a power generation component, wherein the power generation system comprises a main power generation system and a secondary power generation system. The pure oxygen combustion power generation system further comprises a multi-stage supercritical carbon dioxide compressor connected to the main power generation system and the secondary power generation system and used for backflow of supercritical carbon dioxide. A turbo pump is driven to work by high-temperature and high-pressure flue gas generated by oxygen-enriched combustion of a secondary combustion chamber, so that the efficiency and power density of the entire power generation system can be improved. The emission products are high-pressure carbon dioxide and clean water. The high-pressure carbon dioxide can effectively reduce thecost of carbon dioxide capture, facilitates capture and recycling of carbon, and achieves zero emission of carbon dioxide. A waste heat recovery component is provided, so as to realize gradient utilization of energy and improve the overall efficiency of the power generation system.

Description

technical field [0001] The invention relates to the field of power generation with high efficiency, high power density, and carbon dioxide emission reduction and the field of special power systems such as underwater high-power submersibles, specifically a supercritical carbon dioxide semi-closed hydrocarbon fuel pure oxygen combustion power generation system based on staged combustion . Background technique [0002] Carbon dioxide produced by burning fossil fuels such as coal, oil and natural gas is one of the main causes of global warming. Global warming will not only have a huge impact on the natural ecological environment, but even threaten the survival and development of human society. In my country's total carbon dioxide emissions, electricity and heat production and supply industries occupy the leading position. At present, it is difficult to greatly improve the power generation efficiency of conventional thermal power generation systems, and the difficulty and cost o...

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Problems solved by technology

[0006] Most of the publicly reported supercritical carbon dioxide power generation systems are closed cycles (Chinese patents 201620863981.7 and 201610207341.5, etc.), or simple semi-closed cycles with single-stage combustion (Chinese patent 201610513268.4); staged combustion technology is applied to high-power rocket engines, but Combustion temperature control methods are quite different, and there is no precedent for applying staged combustion technology to supercritical carbon dioxide semi-closed hydrocarbon fuel pure oxygen combustion power generation system.

In addition, in the field of ships, there have been cases of using supercritical carbon dioxide closed cycle system as a power system (Chinese patent 201410741203.6), but there has been no application of supercritical carbon dioxide semi-closed hydrocarbon fuel pure oxygen combustion power generation system based on staged combustion precedent

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