直接空冷机组给水泵拖动方式热经济性分析

Thermal Economy Analysis of Feed Water Pump Driving Mode in Direct Air Cooling Unit

直接空冷机组给水泵作为重要辅机之一,对电厂安全稳定运行起着重要作用。采用变热量等效焓降方法,对直接空冷机组电动给水泵与汽动给水泵两种拖动方式进行了分析;结合汽轮机变工况理论,定量计算了两种不同拖动方式下回热系统的参数及排汽压力;比较了两种拖动方式下的机组热经济性指标,以期为机组的优化运行和热力系统优化提供参考。以某600 MW直接空冷机组为例进行分析,结果表明:汽泵方案比电泵方案供电标准煤耗率低3.51 g/(kW·h)。

As one of the important auxiliary equipment, feed water pump of direct air-cooling unit plays a very im-portant role in safe and stable operation of power plants. Analyzed electric feed water pump and steam feed water the two driving methods of pump in the direct air cooling unit, combined equivalent enthalpy drop of varied heat method with variable conditions of steam turbine theory, quantitative calculated the parameters of reheat system and exhaust steam pressure of two different feed water driving modes. Through compared the thermal economy indica-tors of two kinds of feed water pump driving mode, providing the reference for the optimal operation and thermal system optimization. Taking a 600 MW direct air-cooling unit as an example, results showed that standard coal con-sumption rate of power supply of steam pump is 3.51 g/ （ kW·h） less than the one of electric pump.