The flue gas temperature at each point in the outlet of furnace and in convective flue gas conduit are varied according to different degree of furnace pollution on the heating surface in ulility boilers

infuencing upon heat exchange of the furnace and of the convective heating surface thereafter. Directing against a 1035 t/h boiler

the variation regularity of absorbed heat on each heating surface after changing ash pollution coefficient in the furnace has been calculated

theoretical analysis model being established. Combining with data of practical sootblowing operation of the boiler

the influence of furnace pollution variation upon operation of superheater and reheater system has been deeply analysed

having certain reference value for working out optimal sootblowing strategy for furnace of boilers.