... 3 Low fuel consumption Coal Fired Type Air Heater Applicable Range:1. Processing and drying for chemical, textile, pharmacy ... etc.3. Heating supplying for industry and civil buildings. Fuel: 1.Solid fuel---like coal, coke.2.Liquid ... ---like diesel, heavy oil.3.Gas fuel---like coal gas, natural gas, liquid gas.Types:1.Directly ... energy-saving effect of the heating furnace. Coal Fired Type Air Heater