300MW机组循环水系统最优运行方式的研究

Study on the Optimal Operation Mode for 300 MW Unit Circulation Water System

从凝汽器最佳真空的原理入手,分析、探讨了目前火电厂循环水系统的运行优化问题。对水量不连续变化的单元制循环水系统提出了一种离散优化模型,该模型以等效益点迭代计算来决定泵组切换时的临界工况。以十里泉电厂300MW机组为例,利用该模型对循环水系统进行了运行方式的优化研究,确定机组在不同循环水温、不同负荷下最经济的循环水泵运行编组方式,编制了循环水系统最优化运行工况图。为运行中实现指导循环泵的科学经济调度提供了量的依据。效益分析表明,对于300MW机组,循环水系统离散优化可使电厂标准煤耗降低0.5～0.7g/(kW.h)。该方法简便易行,运行可操作性强、节能效果明显,而且无须增加额外的支出,有很好的推广价值。

Based on the turbine optimum vaccum theory, a analysis for optimization operation in fired-coal power plants. A discrete optimized model was proposed for a monobloc configured circulating water system featuring non - continuous change of water flow rate. By conducting iterative calculations of equivalent profit points the model can determine the critical operating conditions at the juncture of switch - over of circulating water pumps. With the 300MW power unit Of the Shiliquan Power Station serving as an example, the present model was used to study operation optimization in order to determine the most economical grouping mode of operation for the circulating water pumps at different seasons and at various loads of the power unit. A profit analysis indicates that for a 300 MW power unit through the introduction of discrete optimization for a circulating water system, it is possible to achieve a reduction Of coal consumption by 0.5-0.7g/（kW·h）. On the basis of thermodynamic test data an empiric formula is determined for the heat transfer factor of a steam condenser, which can serve as a guide for other similar units.