Our air-preheating furnace is horizontal cylinder type. It has multi-layer insulation structure, so it has high heat efficiency；The burner can burn oil or gas alone and can burn oil and gas simultaneously；The fuel feeding system adopts quick disconnection structure, thus the furnace is more compact and takes less space；It can be controlled automatically, the heat load can be automatically adjusted from 20% to 100%. It has safety interlocks, this enables the furnace run safely under abnormal conditions. The furnace runs steadily and is easy to maintain.