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Solutions for Dual Preheating Technology in Blast Furnace Hot StovesI. Current Technical Status at Home and AbroadChallenges in Conventional Domestic Technology:1. Low-Temperature Corrosion from Flue Gas and Blast Furnace Gas (BFG): BFG contains acidic components (Cl⁻, S, etc.), leading to the precipitation of strong acidic water at low temperatures. This causes wet ash clogging, corrodes heat exchangers, resulting in equipment perforation, gas leakage, and safety hazards.2. Low-temperature corrosion of flue gas: If the wall temperature of the heat transfer surface at the flue gas outlet is too low, it can cause low-temperature acid dew point corrosion on the flue gas side, condensation-induced ash blockage, and damage to the heat transfer surface.3. High-Temperature Damage: Heat pipe heat exchangers are prone to tube bursts. Plate/Shell-and-tube heat exchangers suffer from weld seam tearing due to uneven thermal expansion.4. Rapid Performance Degrada...