This text tells when the boiler mounted De NO_x device (SCR or SNCR), remained ammonia reacting with the sulfur trioxide and formed Ammonium Bisulfate, cause the problem of air preheater element surface fouling.

Cause analysis and countermeasures on the over-wind guiding of ID fan and ash fouling of rear pass;

Analysis of cold sector ash fouling and caculating of inlet air temperature of regenerative air heater;

Analysis of ash fouling of air preheater and solving measures

The Analysis of the Ash Clogging in the Tubular Air Pre-heater;

Aiming at severe clogging of rotating type air pre heater so as to forced shutdown,after analysis on the clogging phenomena,mechanism and the various circs during the operation,the fundamental causes of clogging were found,and then the countermeasures were taken,thereby the operation of air preheater and the security of electric power operation got ensured.

This paper analyses the reheater clogging in a 670t/h boiler,and puts forward some reformation methods.

Focusing on the ash clogging problem of a microwave resonance cavity device,for measuring the carbon content in boiler fly ash during operation,of a certain power plant,a calculation analysis was perfomed according to actual conditions of operation and coal quality.