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AssigneesTimothy J. Browder, Hitachi Zosen Corporation
InventorsTimothy J. Browder, Todd W. Browder, Dora J. Browder, Yoichi Yokoyama, Yozo Nakamura, Takeshi Katagiri
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The invention provides a heat recovery method for use in sulfuric acid production plants by which the heat generated in the step of drying SO2 gas or the step of drying air, and the step of absorbing sulfur trioxide in the plant is effectively utilized for heating the water to be supplied to a boiler although the heat is conventionally discarded because of the difficulties encountered in using the heat effectively. The boiler water to be supplied is heated by utilizing the heat generated by drying and/or absorption in a drying tower of the plant for drying sulfur burning air or the sulfur dioxide and/or in an absorption tower of the plant for causing circulating concentrated sulfuric acid to absorb sulfur trioxide produced by the conversion of the sulfur dioxide.
In a sulfuric acid production plant including a drying tower for drying air with circulating concentrated sulfuric acid for burning molten sulfur serving as a material, a sulfur combustion furnace for burning the molten sulfur to produce sulfur dioxide, a converter for converting the sulfur dioxide to sulfur trioxide, and an absorption tower for causing the circulating concentrated sulfuric acid to absorb the sulfur trioxide produced by the conversion of the sulfur dioxide, a heat recovery method of heating the water to be supplied to a boiler by utilizing the heat generated by drying and/or absorption in the drying tower for drying the sulfur burning air or the sulfur dioxide and/or in the absorption tower for causing the circulating concentrated sulfuric acid to absorb the sulfur trioxide produced by the conversion of the sulfur dioxide.
Dependencies are inferred from the claim text.