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International Journal of Chemical Reactor Engineering

Ed. by de Lasa, Hugo / Xu, Charles Chunbao

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Pilot-Scale Study on Improving SNCR Denitrification Efficiency by Using Gas Additives

Zhou Weiqing
  • Electric Power Simulation and Control Engineering Center, Nanjing Institute of Technology, Nanjing 211167, China
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/ Liu Meng
  • Corresponding author
  • Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, China
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/ Huang Baohua / Qiu Xiaozhi
Published Online: 2018-09-25 | DOI: https://doi.org/10.1515/ijcre-2018-0148

Abstract

The experiment of improving Selective Non-Catalytic Reduction (SNCR) denitrification efficiency with gas additives (CH4 and C3H8) was carried out in the 50 kW circulating fluidized bed (CFB) pilot-scale equipment. The results show that the denitrification efficiency can reach 20 % when the reaction temperature is 650 °C, and the optimum mole ratio of C3H8/NH3 is 0.5. The denitrification efficiency can exceed 50 % when the mole ratio of C3H8/NH3 is 0.4 and the reaction temperature is 720 °C. However, the CH4 additive does not promote denitrification at this temperature. When the reaction temperature is 760 °C, the optimum denitrification efficiency of CH4 is 60 %, and the required CH4/NH3 is 0.8. Once the amount of CH4 exceeds the optimal value, the denitrification efficiency is suppressed. In addition, the concentrations of N2O and CO in the gas increase significantly with an increase of gas additives. Due to the incomplete oxidation of C3H8, a large amount of C2H4 is produced in the low-temperature region (< 750 °C) of SNCR.

Keywords: CFB; SNCR; gas additive; denitrification efficiency

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About the article

Received: 2018-06-15

Accepted: 2018-09-16

Revised: 2018-09-09

Published Online: 2018-09-25


Citation Information: International Journal of Chemical Reactor Engineering, 20180148, ISSN (Online) 1542-6580, DOI: https://doi.org/10.1515/ijcre-2018-0148.

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