What is a Hot Blast Stove (Hot Air Furnace)?

A hot blast stove, also known as a hot air furnace, is a device that transfers the heat generated by fuel combustion to air, producing high-temperature hot air for industrial or heating purposes. Its main function is to supply clean, heated air.

Types of Hot Blast Stoves

1. Metallurgical Hot Blast Stove

   • Mainly used in blast furnace ironmaking.

   • Fuel gas (coke oven gas, natural gas, etc.) burns inside the stove and heats up a checker brick chamber.

   • Cold air passes through the hot checker bricks, turning into hot blast (800°C–1300°C) before being blown into the blast furnace.

   • Works in cycles of “heating” and “air supply.”

2. Industrial/Heating Hot Air Furnace

   • Commonly applied in drying systems, grain drying, coating/painting lines, and space heating.

   • Principle: Fuel burns in the combustion chamber → heat exchanger transfers the heat → clean cold air becomes hot air → delivered to the application.

   • Provides clean hot air without mixing flue gas, with temperatures ranging from 50°C to 600°C.

In summary

A hot blast stove is a thermal equipment that converts the energy of fuel into heated air, widely used in metallurgy, drying processes, and building heating.