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Citation: SHU Hang, ZHANG Yu-hua, YANG Lin-jun, LIU Ya-ming, LI Fang-yong, XU Qi-sheng, PAN Si-wei. Effects of SCR-DeNOx system on emission characteristics of fine particles[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(12): 1510-1515. shu

Effects of SCR-DeNOx system on emission characteristics of fine particles

  • 1.

    1. Southeast University, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Nanjing 210096, China;;

  • Corresponding author: YANG Lin-jun, 
  • Received Date: 2 June 2015
    Available Online: 27 August 2015

    Fund Project: 国家重点基础研究发展规划(973计划,2013CB228505) (973计划,2013CB228505)广东电网有限责任公司科技项目(K-GD2013-055)资助项目 (K-GD2013-055)

  • Based on V2O5-WO3/TiO2 catalyst, the size distribution, morphology, element compositions and chemical compositions of fine particles at the output of SCR-DeNOx system were analyzed, and the formation mechanism of fine particles were discussed based on DRIFTS systematically. The results show that great quantities of particles can be formed during the process of SCR-DeNOx. The main components of particles are ammonium bisulfate and a small amount of ammonium sulfate. The effects of SCR-DeNOx system on emission characteristics of fine particles attribute to three aspects. Firstly, some SO2 can be oxided to SO3 during SCR process at the function of catalyst, and then SO3 would react with NH3 and H2O to form ammonium sulfate and ammonium bisulfate particles, which is a reversible process simultaneous with the de NOx reactions. Secondly, SO3 can also react with the escaped NH3 and H2O to form ammonium sulfate and ammonium bisulfate particles after SCR system. Moreover, the free alkaline earth metal oxide in the flue gas(such as CaO) reacts with SO3 and changes the physical properties of the fine particles.
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