630 MW燃煤机组循环水系统运行优化研究

Operation Optimization of Circulating Water System of 630 MW Coal-Fired Unit

以某630 MW燃煤机组的开式循环水系统为研究对象,分别建立循环水泵优化调度模型和机组背压预测模型。为提高模型计算准确性,基于自主开发的热力仿真设计平台中的湿汽透平模块,建立完整的机组仿真模型,计算低压缸排汽流量和排汽焓值。将三个模型耦合,实现机组循环水泵的优化调度。分析了不同电负荷及循环水入口温度下的最佳循环水泵的运行方式,并通过历史运行数据验证了优化模型的准确性,结果表明所建的循环水泵优化调度模型能有效提高机组的运行经济性,降低机组能耗。研究了全负荷段下不同循环水温的循环水泵最优运行方式,以指导机组深度调峰时的循环水泵调度。开发了循环水泵实时优化调度系统,基于现场实时数据给出当前工况下最佳的循环水泵运行方式,为现场运行人员循环水泵调度提供指导建议。

Taking a 630 MW coal-fired unit open circulating water system as the research objective,circulating water pump operation optimization model and prediction model of condenser back pressure were established respectively.In order to improve the accuracy of the model,a complete unit simulation model was established based on the wet steam turbine module in the independently developed thermodynamic simulation design platform to calculate the exhaust steam flow and exhaust steam enthalpy value of the low-pressure cylinder,and the optimization of the unit circulating water pump was realized by coupling the three models.The optimal operation mode of circulating water pump under different electrical load and circulating water inlet temperature was analyzed,and the accuracy of the model was verified by historical operation data.It showed that the established optimal dispatching model of circulating water pump can effectively improve the operation economy of the unit and reduce the energy consumption.The optimal operation mode of circulating water pump with different circulating water temperature under full load section was studied to guide the circulating pump dispatching during deep peak regulation.The real-time optimization scheduling system of circulating water pump was developed to provide the optimal operation mode of circulating water pump based on the real-time data in the field.The research result has certain guiding significance for the operation of circulating water system in the field.