Supercritical carbon dioxide boiler working medium temperature adjusting system and method

Abstract

The invention relates to a supercritical carbon dioxide boiler working medium temperature adjusting system. According to another technical scheme, a supercritical carbon dioxide boiler working mediumtemperature adjusting method is provided. The system and the method effectively solve the temperature adjustment problem of a supercritical carbon dioxide boiler working medium. A part of carbon dioxide working medium in a closed system is cooled and then directly in contact with a high-temperature carbon dioxide working medium for heat exchange, through maintaining reasonable temperature and flowof a low-temperature carbon dioxide working medium entering a temperature adjusting point of the supercritical carbon dioxide boiler, the temperature of the supercritical carbon dioxide boiler working medium is rapidly and flexibly adjusted, the overtemperature of a heating surface of the boiler is avoided, the operation safety of the system is obviously improved, and the service lives of the high-temperature heating surface, pipelines and turbine blades in the system are greatly prolonged.

Description

technical field [0001] The invention relates to a supercritical carbon dioxide boiler working fluid temperature regulation system and method, and belongs to the technical field of supercritical carbon dioxide Brayton cycle high-efficiency cycle power generation. Background technique [0002] The increasing scarcity of energy is a major factor restricting the development of today's society, and people pay attention to improving the utilization rate of energy. Compared with the traditional hydraulic Rankine cycle, the supercritical carbon dioxide Brayton cycle has high cycle thermal efficiency at 500-700 °C, high energy density, simple and compact system, good safety, and no need for oxygen removal, desalination, and sewage discharge And water drainage facilities and other advantages, can reduce the input cost while improving the thermal power conversion efficiency of the system. [0003] For a normal operating supercritical carbon dioxide boiler, keeping the temperature of t...

AI Technical Summary

Problems solved by technology

If the temperature of the supercritical carbon dioxide working medium is too high, the overtemperature and creep speed of the metal materials of the boiler heating surface and the turbine will be accelerated, and the service life of the high-temperature heating surface, pipes and turbine blades will be significantly reduced; if the supercritical carbon dioxide working medium temperature is too high Low will lead to a reduction in unit output, which will affect the overall cycle efficiency of the unit

Moreover, with the increase of power cycle pressure and temperature, excessive deviation in unit operation will greatly increase the high-temperature corrosion rate of boiler heating surface tubes

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