... mixture of air and combustion gases from a burner, in which case the dryer is called a ... gas stream is preheated by some means where burner combustion gases do not enter the dryer, the ... worker ,feeding /output / others operating by workerA:boiler,B:steam tank ,steam pipes,water pipes,valve,pressure ... steam pipe .outside with gear and other equipmentA:boiler,B:steam tank ,steam pipes,water pipes,valve, ...