Production and pilot-scale test of honeycomb DeNOx catalyst for low temperature flue gas from coking plant
Li Changming
Xu Qicheng
Guo Feng
Tang Shibai
Yu Jian
Abstract：The composition was optimized to obtain effective denitration catalyst for industrial application.The corresponding honeycomb catalyst was successfully produced in the continuous industrial production line by hydrothermal process of metatitanic acid,and the performance of the product was evaluated through 5 000 m3/h pilot-scale test over flue gas from coking plant.The results demonstrate that the catalyst product have good low-temperature activity,strength,abrasion resistance as well as low cost.The catalyst exhibited excellent activity and stability with high SOx content (＞ 500×10-6) at 300 ℃C or with low SOx content (＜ 200×10-6) at 250 ℃C for two-week test in coking plant,respectively.NOx emission concentration can be controlled below 250x10-6 or 75 × 10-6 with the ammonia escape less than 3×10-6 by modulation of ammonia nitrogen ratio.For the flue gas with high SOx content (＞ 500×10-6) at 270 ℃C,the catalyst is deactivated slowly during the one-week test,owing to the coverage of catalytic surface by ammonium sulphate species.The deactivated catalyst can be regenerated by high-temperature roasting.
Keywords：low-temperature DeNOxHoneycomb catalystcoking performancePilot-scale testPoisoning and regeneration
Publication Date：2017-01-01