燃煤电厂脱硫主塔氧化风完全失去的影响和预控措施

Impact and preventive measures for total loss of oxidizing air on main desulfurization tower of a coal-fired power plant

某2×330 MW亚临界燃煤供热电厂采用石灰石-石膏湿法烟气脱硫工艺,按照单塔双循环技术进行超净排放改造后,吸收塔采用2台氧化风机(1运1备),机组正常运行中氧化风完全失去,导致吸收塔浆液pH值下降,机组出口SO 2质量浓度上升。分析了吸收塔氧化风完全失去的危害并提出了生产运行中的预防及控制措施,确保脱硫系统安全、可靠、经济运行。

Limestone-gypsum wet flue gas desulfurization process is taken by 2×330 MW subcritical coal-fired units in a heat-supply power plant.After ultra-clean transformation taking single-tower double-circulation technology,the absorption tower sets up two oxidation fans(one for normal operation and one for backup).During the normal operation of the unit,the oxidizing air is totally lost,which causes the increase of slurry pH in the absorption tower and the increase of SO 2 mass concentration at the unit outlet.The hazards of total loss of oxidizing air in the absorption tower are analyzed,and preventive measures during operation are proposed,to ensure the safe,reliable and economical operation of the desulfurization system.