There are two main ways of exhaust gas in painting workshop,one is drying exhaust gas,the other is low concentration exhaust gas such as spray painting room,dot mending room,paint transfer room,etc.Drying exhaust gas is a kind of high concentration exhaust gas.Usually,incineration provides energy to the drying chamber through multi-stage heat exchange,and the heat exchange exhaust gas is discharged directly after multi-stage heat exchange.Low concentration exhaust gas is usually treated by KPR+RTO,and the exhaust gas is discharged through the chimney of the painting workshop after a fresh air heat exchange.