Impact of the Destruction of Furnace Bottom Water Seal on the Unit of Russian-made 880MW Boiler and Control Strategy
Instantaneous destruction of furnace bottom water seal in operation will have a big impact on boiler combustion,with unstable negative pressure in furnace,deterioration of combustion,upward shift of the centre of furnace flame,increase of exhaust gas temperature,and over-temperature of main and reheat steam,which will pose a threat to the safe operation of the unit.Suizhong Power Generation Co.,Ltd.a No.2 furnace slagging machine failure shutdown,need to destroy the No.2 furnace bottom water seal on the slagging machine overhaul treatment.Through analysis,when the bottom of the furnace water seal damage to the No.2 furnace the main impact of unit load drop,the main reheat steam over-temperature,the two steam pump flow deviation,furnace pressure fluctuations,exhaust smoke temperature increases,denitrification SCR inlet NOx concentration increases.In order to ensure the safe and stable operation of the unit,the corresponding countermeasures are put forward,load before destroying the bottom of the furnace water seal,adjust the main reheat steam temperature downward,strengthen the monitoring of the steam pump flow,deviation manual intervention,strengthen the monitoring of the furnace pressure to prevent overload of the induced draft fan,increase the cooling air volume of the air pre-conditioner,reduce the air pre-conditioner outlet flue gas temperature,switch in advance to the operation of the lower mill to reduce the concentration of denitrification SCR inlet nitrogen oxides,the unit load is reduced.Hopefully,it can serve as a reference for the same type of boiler.
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