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ESPs of boiler 2# of Aiyis Power station has, to now, been operated for more than 7 years, but the back corona, dust re-entrainment and rapping difficulty for dust was, due to higher AL2O3 and CaO in ash, higher dust resistivity and very fine particulates as well as large adhere force for fly-ash, often caused. And although a lot of maintenances was to be done, the cleaning efficiency is not satisfied...