Heat-exchange gas hot air furnace includes: burner, combustion chamber, finned tube heat exchanger, blower, induced draft fan, flue gas recirculation fan, and power distribution control cabinet, with a heat efficiency of over 90% and an output temperature as high as 550°C. Flue gas and air flow separately, achieving clean hot air through indirect heat exchange, which can be matched with various drying equipment.

Operating Principle: Fuel is ignited by the burner and enters the combustion chamber for complete combustion. The high-temperature flue gas produced is mixed with the recirculating flue gas in the mixing chamber, where it is cooled to the designed temperature. The cooled flue gas then enters the finned tube air heat exchanger to transfer the heat of the flue gas to the air. After releasing heat, the flue gas temperature drops below 150°C, with part of it being exhausted into the atmosphere by the induced draft fan and the rest being sent back to the combustion chamber by the recirculating fan to regulate the flue gas temperature. The cold air to be heated is forced into the hot air furnace by an optional blower, heated to the set temperature, and then discharged through the hot air outlet to enter the subsequent drying equipment.