600MW机组脱硫浆液量变化建模与设备节能匹配特性分析

MODELING ON VARIATION OF SLURRY YIELD OF DESULFURIZATION OF 600MW UNIT AND ANALYSIS ON THE EQUIPMENT'S ENERGY-SAVING MATCHING PERFORMANCE

火电机组的脱硫与环保密切相关,因此在高度重视环保的今天,脱硫显得非常重要。火电机组FGD(Flue Gas Desulfurization,湿法烟气脱硫)工艺系统复杂,能耗巨大,其中,仅系统电耗就占脱硫装置运行费用80%以上,因此节能降耗对提升脱硫系统的经济性十分重要。通过对某电厂600 MW机组FGD系统运行参数分析,利用建模计算出不同负荷下的浆液并与实际运行浆液量对比,发现实际运行浆液量偏大,这是导致FDG系统能耗偏大的原因。本文提出对浆液循环泵的运行台数和叶轮改造,通过合理的运行匹配来优化运行时最佳浆液量,FGD实际运行按匹配方案投运,全年运行3台浆液泵时,理论节电184.2万k W·h/a,节省电费近64.47万元/a;实际运行节电208.8万k W·h/a,节省电费近73.08万元/a。同时可降低厂用电率,实现电厂进一步节能降耗,大大提高电厂经济性。

Under the circumstance of attentions paid to environmental protection,desulfurization of power plant plays an important role in environmental protection. The proportion of system's power consumption acounts for 80% of the total the equipment's due to the complicated FGD( Flue Gas Desulfurization) system. We calculated slurry yield with the model,compared with the one in actual operation,and found that it was slightly largeer,which lead to the enormous energy consumption of FGD system. Furthermore,we presented that we can optimize the best slurry yield through reformation of quantities of the circulating slurry pump and impellers to further lower the plants ' power consumption rate and improve economical efficiency. With a matching strategy of FGD in actual operation,the plant will save 1 842 MW·h power per year theoretically,equal to RMB 644. 7 thousand per year,and 2088 MW·h per year,equal to RMB730. 8 thousand per year in actual operation.