Variable working condition active-control light-coal complementation indirect air-cooling generation system and method

Abstract

The invention discloses a variable working condition active-control light-coal complementation indirect air-cooling generation system and method. The system comprises a boiler, a turbine, a generator, a high-pressure fed water heater, a low-pressure fed water heater, a deaerator, a steam extraction branch control valve, an absorption type refrigerator, an air-cooling condenser, a fed water branch control valve, a mirror field heat exchanger and a composite paraboloid light condenser. In the daytime in summer, the environmental temperature rises, the back pressure of the turbine rises, the turbine carries out low-pressure steam extraction to drive the absorption type refrigerator to cool air at the inlet of the air-cooling condenser, the back pressure of the turbine is made to reach the design valve, and the light condenser is used for replacing original low-pressure steam extraction to heat fed water. In the daytime in winter, the environmental temperature decreases, the back pressure of the turbine can keep the design value, the turbine carries out low-pressure steam extraction to continue expansion working, and the light condenser is used for replacing original low-pressure steam extraction to heat fed water. By means of the variable working condition active-control light-coal complementation indirect air-cooling generation system and method, the problem of the variable working condition operation efficiency of a traditional air-cooling unit is reduced in summer is solved, the annual average generation efficiency of the unit is improved, and efficient utilization of low-temperature solar energy is achieved.

Description

technical field [0001] The invention relates to the technical field of solar energy and fossil energy complementary power generation and indirect air cooling, and in particular to a light-coal complementary indirect air-cooling power generation system and method that are actively regulated under variable working conditions. Background technique [0002] As of the end of 2009, a total of 35.4GW direct air-cooled thermal power units were put into operation in my country, with an installed capacity of 5.4% of the total installed capacity of thermal power. Direct air-cooled units have the advantages of water saving, good antifreeze performance, small footprint, and low investment costs. But at the same time, the direct air-cooling unit is significantly affected by the environment, and the ambient temperature will have an adverse impact on its economic operation. During the hot summer period, the unit’s operating back pressure is high, rising from the design back pressure of 10-19...

AI Technical Summary

Problems solved by technology

However, the above schemes are mainly aimed at the hot summer. When the ambient temperature drops in winter and the air-cooled unit can achieve the rated operating conditions, the solar mirror field will be idle for a long time, resulting in waste of fixed investment, and it is difficult to improve the economy of the entire system.

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