Benefit Analysis of Boiler Flue Gas when Using Hierarchical Heat Recovery

By analyzing the two levels of boiler flue gas heat recovery program in a dye factory,we find that this scheme indeed improves the boiler efficiency to a certain degree.But without heat insulation treatment to smoke flue and exhaust-heat boiler,much high quality heat energy is lost,which reduce the heat recovery effect,especially the exhaust-heat boiler's thermal efficiency.In addition,with the well heat insulation,we may consider the third level of heat recovery by installing a air-preheater.