Solar air-carbon dioxide combined cycle power generation system

Abstract

The invention discloses a solar air-carbon dioxide combined cycle power generation system. The system comprises an air compressor, a high-temperature solar boiler, an air turbine generator set, a high-temperature heat exchanger, a low-temperature heat exchanger, a high-temperature heat storer, a low-temperature heat storer, a carbon dioxide compressor, a carbon dioxide turbine generator set, a regenerator I, a regenerator II and a cooler. The system uses the characteristic of high average heat absorbing temperature of open air circulation and the characteristics of low circulating temperature and low compression power of closed supercritical carbon dioxide circulation; a solar thermal power generation system generates electricity in a combined cycle power mode at day time; meanwhile, afterheat of part of exhaust is used for medium / low-temperature heat storage; and the system performs single closed carbon dioxide cycle power generation by dint of heat release of a heat storage system at night. The system has such characteristics as high power generation efficiency, low water consumption, low operation cost and good environmental protecting performance, meanwhile, effectively solves the CO2 heat exchange pinch point problem, and has the function of continuously and stably generating electricity for a long time.

Description

technical field [0001] The invention belongs to the technical field of solar thermal power generation, in particular to a solar air-carbon dioxide combined cycle power generation system. Background technique [0002] Solar energy is an inexhaustible clean and renewable energy source. In the face of energy shortage and environmental pollution worldwide, solar energy has become the main body of energy development in the future, and solar power generation will also become a major source of energy in the future. The workhorse of scale power. Solar power generation is divided into solar thermal power generation and photovoltaic power generation. According to the characteristics of scale, the future development potential of solar thermal power generation is greater than that of photovoltaic power generation industry. Solar thermal power generation can be divided into four types: trough type, tower type, dish type, and reflective Fresnel according to the concentrating method. Acco...

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Problems solved by technology

However, studies have shown that carbon dioxide and stainless steel are chemically incompatible at high temperatures, and the conservative maximum temperature of the cycle is about 650°C. Therefore, the thermal efficiency of this cycle is limited by the temperature and cannot be further increased, and it is not compatible with tower or butterfly solar energy. The high-temperature heat source provided by the concentrating device cannot fully match

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