Heat exchanger
Direct-fired hot-air furnaces and indirect-fired hot-air furnaces. In a direct-fired hot-air furnace, the process air is directly mixed with the high-temperature flue gases generated from combustion to achieve the desired hot-air temperature for production drying. An indirect-fired hot-air furnace, on the other hand, uses heat exchange to raise the process air to the required temperature. It boasts notable features such as high temperature-control precision, superior thermal efficiency, low carbon and nitrogen emissions, zero pollution, energy savings, and convenient installation.