Importance

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Abstract

Air heater resisting corrosion, using combustion products from thermal equipment, the combustion products containing polluting and corrosive agents such as sulfur oxidized components and sodium and vanadium salts, the air heater including at least one tube nest through which flows the air to be heated, which is placed in the path of travel of the corrosive fumes prior to their discharge to the atmosphere, the corrosive fumes flowing countercurrent to the air to be heated and flowing through the tubes, this heater further comprising a protective tubular nest placed upstream of the tube nest, this protective nest being fed with a constant flow of cold air circulating in the same direction as the fumes, this cold air flow and the exchange surface of the protective nest being chosen in such manner that the temperature of the first tubes of the heater tubular nest is at all times below the sodium and vanadium corrosion critical temperature. The constant air flow exiting from the protective nest is thereafter redistributed at the inlet or at the outlet of the heater tubular nest, as a function of the operation conditions, so that the temperature of the skin of the tubes of this tubular nest is always slightly above the acid dew point temperature of the fumes.

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First Claim