... to the difference of boiler type.FuelCoal, water gas, city gas, mixed gas, light oil, heavy ... , distillation of aliphatic acid, heating, hydrogenation, esterification.Petrochemical: rectification, heating, thermal insulationPlastic&Rubber: hot-press ... melting&holdingAir-condition: radiant heatingOthers: different application of high temperature heat source below 350°C. horizontal oil fuel (gas) heating ...