Recently, the Coking Plant Coke Oven Flue Gas Desulfurization and Denitrification and Ultra-low Emission Renovation Project of Fangda Special Steel Technology Co., Ltd., constructed by Capital Engineering & Research Incorporation Limited (hereinafter referred to as CERI), was successfully commissioned. The project innovatively adopts a process of “calcium-based dry desulfurization + integrated ceramic filter tube denitration and dust removal” After treatment, the emission concentrations of particulate matter, sulfur dioxide and nitrogen oxides in the flue gas are stably maintained below 10 mg/Nm³, 30 mg/Nm³ and 150 mg/Nm³ respectively, fully achieving ultra-low emissions. 

This technology achieves highly efficient coordination of desulfurization, denitration and dust removal under medium and high temperatures. In the process flow, the flue gas first reacts with calcium-based ultrafine powder in the desulfurization tower to remove sulfur dioxide. It is then uniformly mixed with injected ammonia before entering the ceramic catalytic filter tube reactor. Inside the filter tube, particulate matter is efficiently captured, while nitrogen oxides react with ammonia under the action of SCR catalyst, achieving simultaneous removal. The entire system requires no additional heating, and the operating resistance is overcome by the high-temperature fan at the end, ensuring stable and reliable system operation. 

Process flow chart 

As the core equipment, the ceramic catalytic filter tube uses ceramic fiber as a carrier and is uniformly loaded with the SCR denitrification catalyst internally, combining high-efficiency filtration with catalytic reduction functions. The catalyst loading per unit volume is approximately five times that of traditional honeycomb catalysts. With a large contact area and high reaction efficiency, it can significantly enhance pollutant removal efficiency. 

This integrated technology adopts a modular design, allowing for flexible single- or double-layer layout based on actual operating conditions. Compared to traditional desulfurization and denitrification processes, the system features a compact structure, fewer devices and lower operating costs, while generating no wastewater and minimal solid waste. Characterized by energy saving, high efficiency and low carbon emissions, it aligns closely with the long-process and full-lifecycle development requirements of the iron and steel industry. It provides a replicable and scalable new path for the advanced treatment of coke oven flue gas in China, holding significant demonstrative value for the industry.