Supercritical carbon dioxide brayton cycle system

Abstract

The invention discloses a supercritical carbon dioxide brayton cycle system belonging to the field of power station energy conservation. The supercritical carbon dioxide brayton cycle system mainly comprises a boiler furnace heating face, a boiler tail heating face, an air preheater, a boiler tail flue, a cycle working medium bypass pipeline, a high temperature regenerator, a medium temperature regenerator, a low temperature regenerator, a working medium turbine, a high-temperature gas compressor, an intercooling gas compressor and a cooler. The boiler furnace heating face is rearranged, a high-temperature regenerator bypass is arranged, thus the requirement of newly designed supercritical carbon dioxide cycle heat exchange is matched, cycle efficiency is improved, the utilization performance of low temperature smoke is improved, and heat absorption capacity distribution of the air preheater is improved and is optimized to be the same as the designed heat exchange capacity, corresponding to the air preheater, in coal steam cycle basically. Intercooling compression technology is adopted, cycle efficiency is improved, and the heat exchange interval of the cooler is optimized, thereby being matched with a water cooling system. In addition, the supercritical carbon dioxide brayton cycle system is simple in structure and high in operating efficiency and has good application prospects in engineering.

Description

technical field [0001] The invention belongs to the field of power station energy saving, in particular to a supercritical carbon dioxide Brayton cycle system Background technique [0002] Supercritical carbon dioxide (S-CO 2 ) Brayton cycle is a cycle mode in which carbon dioxide in a supercritical state (critical pressure 7.38MPa, critical temperature 31.05°C) is used as the working medium, and the principle of Brayton cycle is used to realize energy conversion. [0003] The use of supercritical fluid as the circulating working medium is to take advantage of the advantages of high density and low viscosity of the fluid near the supercritical point to reduce the power consumption of the compressor and improve the cycle efficiency. Moreover, supercritical carbon dioxide has the characteristics of non-toxicity, abundant reserves, low cost, stable performance, high density, relatively low critical temperature and pressure, and is considered one of the best circulating working...

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Problems solved by technology

[0004] Supercritical carbon dioxide was proposed as a working fluid in the power cycle in the 1960s, but it was not widely used at that time due to technical limitations

In recent years, with the improvement of the technical level, the application of supercritical carbon dioxide in nuclear reactors has received extensive attention and research from scholars and research institutions at home and abroad, and its combination with tower-type solar heat absorbers has also been widely carried out. Coal-fired boilers are the main power generation methods, but the application of supercritical carbon dioxide in them has developed relatively slowly

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