首台300MW机组凝汽器高温循环水供热的性能研究与分析

Performance Research and Analysis of High Temperature Circulating Water Heating for the First 300MW Condenser

由300MW高温循环水供热机组凝汽器高、低背压运行的试验数据,计算了凝汽器在两种运行状态下的性能指标。在高、低背压工况下运行,凝汽器端差都较小,高背压工况,凝汽器平均端差为2.09℃,低背压工况,凝汽器平均端差为2.74℃,都小于设计端差。改造后,在正常背压319MW工况下,凝汽器运行压力为4.647k Pa,经循环水流量和进水温度修正后的凝汽器压力为4.955k Pa,修正后的端差最大为2.15℃,凝汽器压力稍高于设计值。凝汽器高背压改造后的性能明显提高,改造后,320MW工况下的凝汽器压力比改造前300MW工况的凝汽器压力降低0.475k Pa;相近电负荷270MW工况下,凝汽器改造后压力比改造前降低0.416k Pa。

According to the test data of high and low backpressure situation of a 300MW condenser using high tem- perature circulating water heating, we calculated the operation indexes of the condenser at these situation. The condenser terminal temperature difference is both small at high and low haekpressure situations, the average condenser terminal tem- perature difference is 2.09℃ and 2.74℃ when it＇s at high and low backpressure situation, which are both are smaller than the design value. After the retrofit, under the normal baekpressure condition, the condenser operation pressure is 4.647kPa at 319MW load, the condenser pressure is 4.955kPa after the circulating water flow rate and inlet temperature correction, and the maximum correction terminal temperature difference is 2.15 ℃, which is slightly higher than the design value. The con- denser performance is improved obviously after the high backpressure retrofit. After the retrofit, the condenser pressure at 320MW conditions is 0.475kPa lower than 300MW. Around the load condition of 270MW, the condenser pressure is 0.416kPa lower than that before the retrofit.