潮汐变化下1 000 MW海水直冷机组循环水泵运行优化研究

为了进一步研究沿海大型火力发电厂海水直冷机组的循环水泵经济运行方式，通过试验研究和在线计算优化方法建立了循环水系统受潮汐因素影响的数学模型，并结合建立数据池的方法，逐步对循环水泵运行方式进行优化，以在线煤耗最低为优化目标，建立了循环水泵运行优化模型，得出不同潮汐、海水温度和负荷条件下的循环水泵最佳运行方式；同时，结合机组负荷对未来时段内不同循环水泵运行方式下的单元机组节煤量进行预测，得到未来时段循环水泵最优运行方式，用以指导机组实际运行。潮州发电公司循环水系统采用所研制的在线优化方法后取得了良好的节能效果。

Operation Optimization of Circulating Pump in 1 000-MW Direct Seawater Cooling Generating Unit under Tidal Variations

In order to further explore the economic operation modes of circulating water pump in direct seawater cooling units of large coastal thermal power plants , the mathematical model of the circulating water system under the influences of tides is established based on experimental studies and online optimization calculation method. Also by virtual of the data pool method, the circulation water pump operation mode is optimized step by step. The optimization objective is set to be the minimization of online coal consumption. In this way the model for the pump operation optimization is established, such that the optimal operation modes under different tide, seawater temperature and load conditions are obtained. Meanwhile, based on unit coal saving forecasts under different pump operation modes considering the loading conditions of the generation units, the optimal pump operation modes in future time intervals are obtained to provide guidance for the practical operation. The application of the online optimization method in Chaozhou Power Generation Company shows that the circulating water system has achieved very good energy-saving effects.