Integrated scheme for solar assisted 600 MW supercritical cogeneration unit
Aiming at a 600 MW supercritical cogeneration unit,two coupling schemes of solar energy and the unit were proposed:the first scheme is to replace the high heating steam extraction with the thermal energy of the solar energy field,and the second is to replace the heating steam extraction altogether.The performance calculation and simulation model of a solar-assisted 600 MW supercritical cogeneration unit in the heating season were established using Matlab,and the performance of the two coupling schemes in the heating season was calculated and compared.The results show that both scheme 1 and scheme 2 can improve the performance of the original cogeneration unit.Under the rated steam extraction condition in the heating season,the power generation standard coal consumption rates of scheme 1 and scheme 2 are 221.35 and 225.26 g/(kW∙h),respectively,reducing 28.47 and 24.56 g/(kW∙h)compared to the original cogeneration unit.The photoelectric conversion efficiency of scheme 1 is 16.17%,which is 2.63%higher than that of scheme 2.The peak regulation range of scheme 1 is increased by 58.93%,and that of scheme 2 is increased by 83.33%.The effective direct normal irradiance(DNI)of 235 W/m2 serves as the performance threshold for both scheme 1 and scheme 2.Based on this,the criterion for unit operation optimization strategy was put forward,and the optimal operation strategy of the cogeneration unit in the heating season was determined.In the heating season,according to the operation optimization strategy,134.54 t of coal and 212.37 t of coal are saved compared to scheme 1 and scheme 2,respectively.
solar energysimulationintegrated schemecogeneration unitoperation strategy
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