Analysis and Prevention of Low Temperature Corrosion Problems in the Back-End Equipments of Coal-Fired Boiler
The back-end equipments of coal-fired boiler are prone to such problems as low temperature sulfuric acid condensation,fouling,corrosion and even secondary combustion due to the fouling.These problems have a great negative effect on the safety,economy and environmental protection of boiler operation.This paper differentiates flue gas acid dew point from surface acid dew point of the equipments,and points out that the acid corrosion temperature of back-end equipments in actual operation is the surface acid dew point,which is far lower than the flue gas acid dew point.The low temperature corrosion problems in the denitration device,APH,ESP and FGD system are analyzed.Through the effect analysis of back-end equipments low temperature corrosion by once-through boiler steam heating start-up technology,flexible heat regenerative technology,generalized heat regenerative technology and new flue gas heat recovery system,which are initiated and used in Shanghai Waigaoqiao No.3 Power Plant,we know these technologies have a very high reference and guidance value to the low temperature corrosion prevention of other power plants.
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