What did Hot-Blast Preheating Furnace look like?

An annular preheating air duct is built into the outer furnace wall. Cold air enters the duct, is preheated by radiant heat from the furnace wall, and then delivered into the combustion zone.

How did Hot-Blast Preheating Furnace work?

Cold air → furnace wall preheating duct → absorbs radiant heat from wall → hot air (200-400°C) → enters furnace chamber for combustion → combustion temperature rises → pig iron output increases and coke ratio decreases.

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高炉预热送风

Hot-Blast Preheating Furnace

Using the blast furnace's own waste heat to preheat incoming blast air, raising furnace temperature and reducing fuel consumption. A precursor to the modern hot-blast stove.

高炉预热

Scientific Principle

Thermodynamics: preheating combustion air raises the adiabatic flame temperature. Energy recovery: waste heat reuse improves overall system thermal efficiency.

高炉预热送风

Hot-Blast Preheating Furnace

Scientific Principle

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