685 / 2019-04-30 12:06:44

Analysis on Thermoelectric Coupling And Peak Load Regulation of F-class Combined Cycle Cogeneration UnitAnalysis on Thermoelectric Coupling And Peak Load Regulation of F-class Combined Cycle Cogenerat

combined cycle, thermal system modeling, thermoelectric coupling, peak load regulation

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With the rapid development of gas turbine technology, a growing number of combined cycle units in China are used for cogeneration, which also take charge of some portions of peak load regulation in the power grid. Based on Ebsilon thermal simulation platform, an off-design thermal system calculation model of a F-class 460 MW combined cycle cogeneration unit was built. By using the established model, the calculations of a series of variable working conditions of different gas turbine load rates and different steam extraction mass flows were carried out. According to the simulation results, the thermoelectric coupling and peak load regulation of the combined cycle cogeneration unit were analyzed. The results show that in local winter condition, as the steam extraction mass flow increases, the thermal load of the unit increases linearly, and the generation load decreases linearly. When the gas turbine load rates are 100%, 75% and 50% respectively, the maximum heating steam extraction mass flow of the combined cycle unit is 205 t/h, 170 t/h, 105 t/h. Combined cycle efficiency of the unit increases with increasing steam extraction mass flow. Besides, the lower the gas turbine load rate, the more significant the same steam extraction mass flow improves the combined cycle efficiency of the unit. In the range of 0 ~ 205 t/h steam extraction mass flow, the peak regulation margin of the unit varies from 238 MW to 0. The research results can provide data support and theoretical reference for the economic operation of the combined cycle cogeneration unit and the peak regulation strategy of the top cycle and the thermoelectric optimization distribution of the bottom cycle.