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2026

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08

Application of High-Specific-Surface Calcium Hydroxide in Flue Gas Desulfurization in the Coking Industry

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The coking industry generates flue gases with complex compositions. Flue gases from coke ovens, dry quenching vent streams, and pusher‑side ground stations exhibit significant sulfur fluctuations and high particulate loads, while conventional desulfurization agents suffer from low reaction efficiency, making it difficult to consistently achieve ultra‑low emissions. High‑specific‑surface‑area calcium hydroxide, with an exceptionally large specific surface area of 50–100 m²/g, uniform particle size, and extremely high reactivity, has emerged as the preferred material for desulfurizing coking flue gases.
Compared with conventional calcium hydroxide, it features a highly porous particle structure that ensures thorough contact with SO₂ and SO₃ in flue gas, enabling rapid acid–base neutralization and effectively accommodating the short‑duration, highly variable operating conditions typical of coking plant emissions. In applications such as ground‑based dust collection during coke pushing and flue‑gas treatment in coke ovens, dry or semi‑dry desulfurization processes are employed, eliminating the need for complex wastewater‑treatment systems and simplifying equipment operation and maintenance.
Industrial application data show that, when used in coking desulfurization projects, this material can stably maintain flue gas sulfur dioxide emissions below 10 mg/m³, fully meeting ultra‑low emission standards. Meanwhile, reagent consumption is reduced by more than 30% compared with conventional calcium‑based desulfurizers, and the desulfurization byproducts are of high purity, enabling resource recovery and reuse. This effectively lowers environmental protection and operation‑and‑maintenance costs for coking enterprises and ensures long‑term, stable performance across a wide range of large and medium‑sized coking production lines.

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