SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (8): 943-949.DOI: 10.1016/j.cjche.2014.06.002

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles     Next Articles

Experimental and Modeling Study on de-NOx Characteristics of Selective Non-catalytic Reduction in O2/CO2 Atmosphere

Hui Li, Kuihua Han, Hongtao Liu, Chunmei Lu   

  1. National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • Received:2013-03-04 Revised:2013-09-16 Online:2014-11-04 Published:2014-08-28
  • Supported by:

    Supported by the National Natural Science Foundation of China (51206096).

Experimental and Modeling Study on de-NOx Characteristics of Selective Non-catalytic Reduction in O2/CO2 Atmosphere

Hui Li, Kuihua Han, Hongtao Liu, Chunmei Lu   

  1. National Engineering Laboratory for Coal-fired Pollutants Emission Reduction, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
  • 通讯作者: Kuihua Han
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51206096).

Abstract: An experimental study of thermal de-NOx using NH3 as reductant in O2/CO2 atmosphere with the effect of SO2 and different additiveswas performed in a drop tube furnace. Results show that the optimum temperature window is 841-1184℃, and the optimumreaction temperature is about 900℃ with a de-NOx efficiency of 95.4%. A certain amount of SO2 has an inhibiting effect on NO reduction. The effect of additives, including Na2CO3, C2H5OH and FeCl3, on NO reduction by NH3 is also explored. The addition of Na2CO3 and FeCl3 is useful towiden the temperature window and shift the reaction to lower temperature for the efficiency is increased from 30.5% to 74.0% and 67.4% respectively at 800℃. Qualitatively, the modeling results using a detailed kinetic modeling mechanism represent well most of the process features. The effect of Na2CO3, C2H5OH and FeCl3 addition can be reproduced well by the Na2CO3, C2H5OH and Fe(CO)5 sub-mechanism respectively. The reaction mechanism analysis shows that the effects of these additives on NO reduction are achievedmainly by promoting the production of OH radicals at lower temperature.

Key words: Selective non-catalytic reduction, Denitrification, Ammonia, Kinetic modeling, O2/CO2, SO2, Additives

摘要: An experimental study of thermal de-NOx using NH3 as reductant in O2/CO2 atmosphere with the effect of SO2 and different additiveswas performed in a drop tube furnace. Results show that the optimum temperature window is 841-1184℃, and the optimumreaction temperature is about 900℃ with a de-NOx efficiency of 95.4%. A certain amount of SO2 has an inhibiting effect on NO reduction. The effect of additives, including Na2CO3, C2H5OH and FeCl3, on NO reduction by NH3 is also explored. The addition of Na2CO3 and FeCl3 is useful towiden the temperature window and shift the reaction to lower temperature for the efficiency is increased from 30.5% to 74.0% and 67.4% respectively at 800℃. Qualitatively, the modeling results using a detailed kinetic modeling mechanism represent well most of the process features. The effect of Na2CO3, C2H5OH and FeCl3 addition can be reproduced well by the Na2CO3, C2H5OH and Fe(CO)5 sub-mechanism respectively. The reaction mechanism analysis shows that the effects of these additives on NO reduction are achievedmainly by promoting the production of OH radicals at lower temperature.

关键词: Selective non-catalytic reduction, Denitrification, Ammonia, Kinetic modeling, O2/CO2, SO2, Additives