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Two-stage chemical absorption-biological reduction system for NO removal: model development and footprint estimation Jingkai Zhao, Chunyan Zhang, Meifang Li, Sujing Li, Wei Li, and Shihan Zhang Energy Fuels, Just Accepted Manuscript • DOI: 10.1021/acs.energyfuels.7b01620 • Publication Date (Web): 13 Jul 2017 Downloaded from http://pubs.acs.org on July 16, 2017
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Energy & Fuels
Two-stage chemical absorption-biological reduction system for NO removal: model development and footprint estimation Jingkai Zhao,† Chunyan Zhang,† Meifang Li,† Sujing Li,† Wei Li,*,† and Shihan Zhang*,‡
†
Key Laboratory of Biomass Chemical Engineering of Ministry of Education,
Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University, Yuquan Campus, Hangzhou 310027, China ‡
Key Laboratory of Microbial Technology for Industrial Pollution Control of
Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China
ABSTRACT: The two-stage chemical absorption-biological reduction (CABR) system, comprising of an absorption column and a bioreactor, is regarded as a promising option for NO removal from the middle- and small-sized boilers. In this work, a steady-state rate based model was developed for the two-stage CABR system. The developed model was validated by the data obtained from a laboratory two-stage CABR set-up and then used for the estimation of the footprints for treating a 5×104 m3 h-1 flue gas from a 14 MW coal-fired steam boiler. For a baseline case (L/G=10 L m-3, Cin,NO=350 ppm, Cin,O2=6%(v/v)), the designed absorption column size was 3.60×8.75 m (d×h), while the bioreduction column was set at 3.60×8.50 m (d×h). Furthermore, sensitive analysis including the influence of gas concentrations, packing properties, 1
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and microorganism activities was investigated to optimize the design and operation of two-stage CABR process. Under optimized conditions, the footprint of the bioreactor can be downsized by 22.74%. It is believed that this work can provide fundamental data for the industrial application of the two-stage CABR system in the middle- and small-sized boilers.
1. INTRODUCTION Nitric oxides (NOx) emission can lead to acid deposition, ozone depletion, haze, and other negative impacts on human health and ecosystem.1, 2 As reported by the Chinese Ministry of Environmental Protection, in 2014, 67.6% of the 2.078×1010 kg NOx emitted in China was derived from direct coal combustion, among which power plants and industrial boilers accounted for 50% and 21% respectively.3 Due to the deployment of Selective Catalytic Reduction (SCR) technology in large power plants, the annual NOx emission only decreased by ~11% in 2015.4 Therefore, the control of NOx emission from industrial boilers is critical. Because of its high operating cost and low efficiency at low temperature (
