Key Technologies and Application Practices of High- Temperature and High-Dust SCR Denitrification for Cement Kilns
Main Article Content
Keywords
cement kiln, SCR denitrification, ultra-low emission, high temperature and high dust, CFD simulation
Abstract
Under increasingly stringent national environmental protection policies, ultra-low emission renovation has become an inevitable trend for nitrogen reduction and pollution control in the cement industry. SCR denitrification technology features high efficiency and can achieve ultra-low NOₓ emission (≤50 mg/m³). However, cement kiln flue gas with high temperature, high dust and high alkali metals brings severe challenges to the stable operation of SCR systems. This paper discusses key technologies and engineering practices of high-temperature and high-dust SCR denitrification for cement kilns. It analyzes core problems including catalyst clogging, abrasion, poisoning and flow field imbalance, and proposes targeted solutions such as customized catalyst design, CFD simulation optimization, combined soot blowing and intelligent control. A 5000 t/d cement production line case shows that after renovation, NOₓ emission is stably below 35 mg/m³, ammonia slip is less than 2.5 ppm, and system resistance is below 800 Pa, realizing long-term stable and economic ultra-low emission operation.
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