Improved efficient recuperative coal-based supercritical CO2 secondary reheating power generation system

Abstract

The invention relates to an improved efficient recuperative coal-based supercritical CO2 secondary reheating power generation system. The system comprises a carbon dioxide high-pressure turbine, a carbon dioxide middle-pressure turbine, a carbon dioxide low-pressure turbine, a high-temperature recuperative heater, a low-temperature recuperative heater, a re-compressor, a main compressor, a condenser, a coal-fired boiler air preheater, an air preheater smoke bypass high-temperature heat exchanger, an air preheater smoke bypass low-temperature heat exchanger, a boiler primary reheater, a boilersecondary reheater and a smoke heat exchanger cold side bypass. According to the system, a secondary reheat carbon dioxide power generation system is arranged, the circulation heat efficiency can be improved by 0.3%; a recuperative heating system for heating the carbon dioxide through the smoke is arranged, on one hand, the smoke discharge loss is reduced, the efficiency of a boiler is improved by0.5%, and on the other hand, irreversible heat exchange loss of heat transfer of the recuperative heater is reduced, and the heat efficiency of the circulating power generation can be improved by about 0.15%. By means of the system, the circulation efficiency of an existing coal-based supercritical carbon dioxide power generation system can be integrally improved by about 1% or above.

Description

technical field [0001] The invention belongs to the technical field of supercritical carbon dioxide power generation, in particular to an improved high-efficiency regenerative coal-based supercritical CO 2 Secondary reheat power generation system. Background technique [0002] Supercritical carbon dioxide power generation system, because supercritical carbon dioxide has many characteristics such as stable chemical properties, high density, simple circulation system, compact structure and high efficiency, it has become the focus of research at home and abroad in recent years. [0003] Judging from the existing reports and published supercritical carbon dioxide power generation research results and test systems, there are not many efficient and advanced systems that combine coal-fired boilers with carbon dioxide power generation. One is that the regenerative system is limited by the high-efficiency heat exchanger, because in the carbon dioxide power generation system, the reg...

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Problems solved by technology

One is that the heat recovery system is limited by the high-efficiency heat exchanger, because in the carbon dioxide power generation system, the heat recovery heater is difficult to design due to high pressure and high temperature, and improving heat exchange efficiency is also a problem

[0004] Second, the current research has not combined the cascade utilization of boiler flue gas heat, which also leads to high boiler exhaust gas temperature, which affects the improvement of the overall power generation cycle thermal efficiency

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