CLC number: X773
On-line Access: 2018-02-05
Received: 2016-10-03
Revision Accepted: 2017-03-16
Crosschecked: 2018-01-15
Cited: 0
Clicked: 5402
Citations: Bibtex RefMan EndNote GB/T7714
Chang Liu, Hong Zhao, Wei-ying Yang, Kun-zan Qiu, Jian-guo Yang, Zi-wen Geng, Wei-ming Teng, Wei-zhong Yuan, Xi-jiong Chen. Chemical kinetics simulation of semi-dry dechlorination in coal-fired flue gas[J]. Journal of Zhejiang University Science A, 2018, 19(2): 148-157.
@article{title="Chemical kinetics simulation of semi-dry dechlorination in coal-fired flue gas",
author="Chang Liu, Hong Zhao, Wei-ying Yang, Kun-zan Qiu, Jian-guo Yang, Zi-wen Geng, Wei-ming Teng, Wei-zhong Yuan, Xi-jiong Chen",
journal="Journal of Zhejiang University Science A",
volume="19",
number="2",
pages="148-157",
year="2018",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1600653"
}
%0 Journal Article
%T Chemical kinetics simulation of semi-dry dechlorination in coal-fired flue gas
%A Chang Liu
%A Hong Zhao
%A Wei-ying Yang
%A Kun-zan Qiu
%A Jian-guo Yang
%A Zi-wen Geng
%A Wei-ming Teng
%A Wei-zhong Yuan
%A Xi-jiong Chen
%J Journal of Zhejiang University SCIENCE A
%V 19
%N 2
%P 148-157
%@ 1673-565X
%D 2018
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1600653
TY - JOUR
T1 - Chemical kinetics simulation of semi-dry dechlorination in coal-fired flue gas
A1 - Chang Liu
A1 - Hong Zhao
A1 - Wei-ying Yang
A1 - Kun-zan Qiu
A1 - Jian-guo Yang
A1 - Zi-wen Geng
A1 - Wei-ming Teng
A1 - Wei-zhong Yuan
A1 - Xi-jiong Chen
J0 - Journal of Zhejiang University Science A
VL - 19
IS - 2
SP - 148
EP - 157
%@ 1673-565X
Y1 - 2018
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1600653
Abstract: HCl in coal-fired flue gas has adverse impact on the environment, equipment, and the flue gas desulfurization (FGD) system. The existence of HCl also increases the difficulty of the treatment of desulfurization waste water. semi-dry dechlorination technology is put forward to attach chlorine to fly ash by spraying in alkaline solution. Simultaneously, desulphurization waste water is used as the solvent of alkali, and this could help realize the target of near-zero emission of desulfurization waste water. CHEMKIN is used to build a chemical kinetics model, which is based on the measured components of flue gas in a coal-fired power plant. NaOH is set as the alkali absorbent in the model. Both the competitive relationship of SO2 and HCl and the effects of different factors on HCl reaction efficiency are analyzed. SO2 with high concentration would compete for more NaOH, but when na/Cl (ratio in mole) is 1, the reaction efficiency of HCl achieves 22.28%, and it is positively correlated with na/Cl. When na/Cl surpasses 5, the reaction efficiency of HCl increases to beyond 70%. As na/Cl continues to increase, there is a slower growth of HCl reaction efficiency and it finally achieves 100% when na/Cl reaches 12. With a fixed value of na/Cl, a change of 1000 mg/m3 in SO2 concentration would change the reaction efficiency of HCl about 13%. The effect of flue temperature on HCl reaction efficiency is not significant. Acid gases in flue gas react with NaOH completely in 0.1 s and come to equilibrium after about 1 s.
[1]Ayotte P, Hébert M, Marchand P, 2005. Why is hydrofluoric acid a weak acid? The Journal of Chemical Physics, 123(18):184501.
[2]Deng S, Zhang C, Liu Y, et al., 2014. A full-scale field study on chlorine emission of pulverized coal-fired power plants in China. Research of Environmental Sciences, 27(2):127-133.
[3]Farmer RW, Jarvis JB, Moser R, 1989. Effects of aluminum fluoride chemistry in wet limestone flue-gas desulfurization. Chemical Engineering Communications, 77(1):135-154.
[4]Finkelman RB, Belkin HE, Zheng BS, 1999. Health impacts of domestic coal use in China. Proceedings of the National Academy of Sciences, 96(7):3427-3431.
[5]Gao X, Huo W, Luo ZY, et al., 2008. CFD simulation with enhancement factor of sulfur dioxide absorption in the spray scrubber. Journal of Zhejiang University-SCIENCE A, 9(11):1601-1613.
[6]Glarborg P, Marshall P, 2005. Mechanism and modeling of the formation of gaseous alkali sulfates. Combustion and Flame, 141(1-2):22-39.
[7]Hall B, Sehager P, Lindqvis O, 1991. Chemical reactions of mercury in combustion flue gases. Water Air & Soil Pollution, 56(1):3-14.
[8]Hartman M, Svoboda K, Pohorely M, et al., 2014. Reaction of hydrogen chloride gas with sodium carbonate and its deep removal in a fixed-bed reactor. Industrial and Engineering Chemistry Research, 53(49):19145-19158.
[9]Hu S, Ding SF, Fan ZS, 2015. Zero release technology of desulfurization waste water in coal-fired power plant. Clean Coal Technology, 21(2):129-133 (in Chinese).
[10]Jimenez A, Martinez-Tarazona MR, Suarez-Ruiz I, 2000. The mode of occurrence and origin of chlorine in Puertollano coals (Spain). Fuel and Energy Abstracts, 41(2):73.
[11]Liu ZS, Wey MY, Lin CL, 2002. Reaction characteristics of Ca(OH)2, HCl and SO2 at low temperature in a spray dryer integrated with a fabric filter. Journal of Hazardous Materials, 95(3):291-304.
[12]Mori T, Matsuda S, Nakajima F, et al., 1981. Effect of Al3+ and F on desulfurization reaction in the limestone slurry scrubbing process. Industrial and Engineering Chemistry Process Design and Development, 20(1):144-147.
[13]Pang YK, 1998. Modern Drying Technology. Chemical Industry Press, Beijing, China, p.262-282 (in Chinese).
[14]Poskrobko S, Lach J, Krol D, 2010. Experimental investigation of hydrogen chloride bonding with calcium hydroxide in the furnace of a stoker-fired boiler. Energy and Fuels, 24(3):1948-1957.
[15]Poskrobko S, Krol D, Lach J, 2012. Hydrogen chloride bonding with calcium hydroxide in combustion and two-stage combustion of fuels from waste. Energy and Fuels, 26(2):842-853.
[16]Shao DK, Hutchinson EJ, Cao H, et al., 1994. Behavior of chlorine during coal pyrolysis. Energy and Fuels, 8(2):399-401.
[17]Stein J, Kind M, Schlünder EU, 2002. The influence of HCl on SO2 absorption in the spray dry scrubbing process. Chemical Engineering Journal, 86(1-2):17-23.
[18]Takeda M, Ueda A, Hashimot OH, et al., 2006. Fate of the chlorine and fluorine in a sub-bituminous coal during pyrolysis and gasification. Fuel, 85(2):235-242.
[19]Xie HW, Zhang YF, Zhang Y, 2008. Numerical simulation and experimental study of flue gas cleaning in waste incineration power plants. Proceedings of the CSEE, 28(5):17-22 (in Chinese).
[20]Xu G, Yuan X, Yang YP, 2012. Optimization operation of flue gas desulfurization systems in power plants for energy conservation. Proceedings of the CSEE, 32(32):22-29 (in Chinese).
[21]Xu X, Jiang XG, He J, et al., 2002. Experimental research on present form of chlorine in coal. Coal Geology and Exploration, 30(4):3-6 (in Chinese).
[22]Zhang JB, Hao W, Zhao ZJ, et al., 2011. Theoretical and practical research on mechanism of low-temperature corrosion caused by boiler flue gas. Journal of Chinese Society of Power Engineering, 31(10):730-733 (in Chinese).
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