511 / 2019-01-02 12:27:49

F级联合循环热电联产机组供热特性与调峰能力分析/Analysis on Heating Supply Performance and Peak-load Regulation of F-class Combined Cycle Cogeneration Unit

联合循环；热力系统建模；供热特性；调峰/combined cycle, thermal system modeling, heating performance，peak load regulation

全体主题 > 涡轮机

基于EBSILON热力仿真平台，建立某F级460 MW联合循环热电联产机组热力系统变工况计算模型。利用所建立的模型进行不同燃机负荷率以及不同供热抽汽流量的一系列变工况计算，根据仿真结果分析联合循环热电联产机组的供热抽汽特性以及调峰能力。结果表明：100%燃机负荷率下，当抽汽供热量从0增加至580 GJ/h时，机组联合循环效率由58.18%上升至72.95%，汽轮机的发电热耗率由6188 kJ/kWh降低至5487 kJ/kWh，联合循环效率与汽轮机的发电热耗率随抽汽供热量线性变化；随着供热抽汽量的增加，机组最大出力减小，最小出力变大，因此机组调峰裕度减小，调峰能力减弱；在一定的供热负荷下，随着燃机负荷率减小，汽机最大发电功率减小，机组调峰裕度减小，调峰能力减弱。研究结果可为联合循环热电联产机组的经济运行以及顶循环的调峰策略和底循环的热电优化分配提供数据支撑和理论参考。/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 heating supply mass flows were carried out. According to the simulation results, the heating supply performance and peak-load regulation of the combined cycle cogeneration unit were analyzed. The results showed that when the heating supply increases from 0 to 580 GJ/h at 100% gas turbine load rate, the combined cycle efficiency of the unit increased from 58.18% to 72.95%, and the heat consumption rate of the steam turbine reduced from 6188 kJ/kWh to 5487 kJ/kWh. The combined cycle efficiency of the unit and the heat consumption rate of the steam turbine varied linearly with the heating supply extraction mass flow. It was found that as the heating supply extraction mass flow increased, the maximum generation power decreased and the minimum generation power increased, which meant that the peak-load regulation margin was reduced and the peak-load regulation capacity was weakened. Under a certain heating load, as the gas turbine load rate decreased, the maximum power generation of the steam turbine decreased, which also leaded to the reduction of the peak-load regulation margin. The research results can provide data supports and theoretical references for the economic operation of the combined cycle cogeneration unit, as well as the peak-load regulation strategy of topping cycle and thermoelectric optimization of bottoming cycle.