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2025
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03
Compared to sodium bicarbonate, what are the advantages of using high specific surface area calcium hydroxide in dry desulfurization?
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Sodium bicarbonate desulfurization
(1) Sodium bicarbonate desulfurization requires a high reaction temperature; the optimal temperature is above 180℃, and no reaction occurs below 140℃;
(2) A large amount of sodium bicarbonate is required; 2.625 tons are needed to remove one ton of sulfur dioxide;
(3) The by-products of sodium bicarbonate desulfurization are sodium sulfate and sodium sulfite salt dust, which are difficult-to-handle hazardous wastes and must be processed by a professional company;
(4) The sodium bicarbonate desulfurization system requires a 4-11kw grinder, increasing electricity costs and causing noise and dust pollution, resulting in a poor working environment;
(5) The products of sodium bicarbonate desulfurization are sodium salts, carbon dioxide, and water. Removing one ton of sulfur dioxide produces at least 1.375 tons of carbon dioxide, increasing carbon emissions and resulting in poor economic and social benefits.
High surface area calcium hydroxide desulfurization
(1) High surface area calcium desulfurization adapts to a wide temperature range and can react efficiently at 20℃~400℃;
(2) Less high surface area calcium is required; 1.156 tons are needed to remove one ton of sulfur dioxide, which is 44% of the amount of sodium bicarbonate required;
(3) The by-products of high surface area calcium desulfurization are calcium sulfate and calcium sulfite dust, which are general solid wastes and can be directly used as auxiliary materials in cement, bricks, and other building materials.
(4) The high surface area calcium desulfurizer is a 325-mesh ultrafine powder that can be used directly without grinding, eliminating noise and dust pollution;
(5) The products of high surface area calcium desulfurization are calcium salts and water, which do not increase carbon emissions and result in good economic and social benefits;
(6) High surface area calcium can directly replace sodium bicarbonate in sodium bicarbonate desulfurization systems.
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