某供热机组工业抽汽优化改造与热经济性分析

Heat economic analysis of a heating unit with industrial steam extraction retrofitting

以某300 MW供热机组为对象,进行工业抽汽优化改造设计。通过对比分析得出,在机组低负荷运行时,对比再热冷锻抽汽、再热热锻抽汽与原有设计工业抽汽3种方式,最优的供热方式为再热冷锻抽汽。进行再热冷锻抽汽优化后,避免了节流损失,每年可节约标准煤1.35万t,供热收益增加728万元,改造效果显著;通过设置降温水来控制锅炉再热器的温度,从而避免出现过热现象;并通过工业抽汽试验,确定该负荷下的最大抽汽量,从而保证机组在安全抽汽工况下稳定运行。

Based on a 300 MW heating unit, designs an industrial steam extraction optimization. Through the comparison analysis, the cold reheat steam extraction is better than heat reheat steam extraction and original industrial steam extraction at the low load. After optimization by cold reheat steam extraction, the throttle loss is avoided, 13 500 tons of standard coal can be saved each year and 7.28 million yuan of heating benefit can be increased, with obvious technical innovation effects. The temperature of boiler reheater can be controlled by cooling water temperature, avoiding the overheating phenomenon. And through the industrial steam extraction test, the maximum extraction steam rate can be confirmed under given load condition, which is helpful to stable operating of the unit under the safe steam extraction condition.