EFFECT OF SO<sub>2</sub> ON REMOVAL OF HCl FROM SURFACE OF Ca(OH)<sub>2</sub> ABSORBER

LIANG Baorui; MA Mengying; SU Wei; LI Wei; HOU Changjiang; WANG Qunhui

doi:10.13205/j.hjgc.202409021

Volume 42 Issue 9

Sep. 2024

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2024 > 42(9): 222-228

LIANG Baorui, MA Mengying, SU Wei, LI Wei, HOU Changjiang, WANG Qunhui. EFFECT OF SO2 ON REMOVAL OF HCl FROM SURFACE OF Ca(OH)2 ABSORBER[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 222-228. doi: 10.13205/j.hjgc.202409021

Citation:

LIANG Baorui, MA Mengying, SU Wei, LI Wei, HOU Changjiang, WANG Qunhui. EFFECT OF SO₂ ON REMOVAL OF HCl FROM SURFACE OF Ca(OH)₂ ABSORBER[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(9): 222-228. doi: 10.13205/j.hjgc.202409021

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EFFECT OF SO₂ ON REMOVAL OF HCl FROM SURFACE OF Ca(OH)₂ ABSORBER

doi: 10.13205/j.hjgc.202409021

1. Tianjin College, University of Science and Technology Beijing, Tianjin 301830, China;
2. School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
3. Boshan Ecological Environment Center for Technology Service of Shandong, Zibo 255200, China;
4. HBIS Group Co., Ltd., Shijiazhuang 050000, China

Received Date: 2023-12-20
Available Online: 2024-12-02

Abstract

Abstract

The use of calcium hydroxide [Ca(OH)₂] as a solid reactant for the removal of hydrogen chloride (HCl) from industrial flue gas streams is a simple and effective process solution. There are many scenarios in practical application where HCl needs to be pre-removed before subsequent pollutant treatment. Nevertheless, sulfur dioxide (SO₂) in flue gas has instinctive and strong competition with HCl on the alkaline absorbent surface, resulting in detrimental effects and making the removal mechanisms confused, and previous studies have not yet achieved a convincing consensus. To solve this issue, this paper designed a series of experiments on a fixed-bed reactor to evaluate the effect of SO₂ on the performance of the absorber in removing HCl. The competition mechanism of SO₂ to HCl was further studied by combining the characterization results and thermodynamic characteristics. The results indicated that at the surface of the Ca(OH)₂ absorber, HCl had a better preference on active sites than SO₂, thus HCl was able to enter the interior of the absorber to continue the reaction. During the competition process, SO₂ reduced the surface activity by depleting the active sites on surface of the Ca(OH)₂ absorber, and forming a product layer, thus adversely affecting the removal of HCl. These findings contribute to the elucidation of SO₂ competition to HCl on the calcium-based adsorbent in sintered flue gas.
- HCl,
- alkaline absorbent,
- SO₂,
- Ca (OH)₂,
- fixed bed experiment,
- removal performance

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References(30)

References

[1]	程琳. 关注钢铁行业二噁英污染,重视烧结烟气污染物协同治理[C]//中国金属学会.第八届(2011)中国钢铁年会论文集.冶金工业规划研究院; 2011:5.
[2]	刘畅. 燃煤烟气半干法脱氯实现脱硫废水零排放基础研究[D].杭州:浙江大学, 2017.
[3]	沈伟亮. 钢铁工业污染物实施超低排放及对策思考[J]. 资源节约与环保, 2020(2): 71.
[4]	TANG H, DUAN Y, ZHU C, et al. Theoretical evaluation on selective adsorption characteristics of alkali metal-based sorbents for gaseous oxidized mercury[J]. Chemosphere, 2017, 184: 711-719.
[5]	HUANG T, LIU X, GENG X, et al. Reduction of HgCl₂ to Hg⁰ in flue gas at high temperature. Part Ⅱ: acid remover[J]. Fuel, 2022, 324: 124412.
[6]	HONG J, ZHAO Y, WU J, et al. Fabrication of Al₂O₃/CaO with anti-sintering for efficient removal of As₂O₃ in simulated flue gas: experimental and DFT study[J]. Fuel, 2022, 307: 121812.
[7]	TANG H, LI C, DUAN Y, et al. Combined experimental and theoretical studies on adsorption mechanisms of gaseous mercury(Ⅱ) by calcium-based sorbents: the effect of unsaturated oxygen sites[J]. Science of The Total Environment, 2019, 656: 937-945.
[8]	SUN S, XU D, LIANG Y, et al. Effect of temperature, oxygen concentration, and CaO addition on SO₂ and NO_x emissions during oxygen-fuel combustion of municipal sludge[J]. Journal of the Energy Institute, 2022, 105: 424-432.
[9]	YU Y, ZHAO R, CHEN J, et al. The effect of SO₂ on CaO capture selenium in the flue gas: density functional theory and experimental study[J]. Chemical Engineering Journal, 2022, 431: 134267.
[10]	LIU X, WANG R, WANG Y, et al. Effect of SO₂ on HCl removal over ethanol-hydrated CaO adsorbent: mechanism of competitive adsorption and product layer shielding[J]. Chemical Engineering Journal, 2023, 464: 142516.
[11]	CHEN D, WANG X, ZHU T, et al. HCl dry removal with modified Ca-based sorbents at moderate to high temperatures[J]. Journal of Thermal Science, 2003, 12(3): 283-288.
[12]	DUO W, KIRKBY N F, SEVILLE J P K, et al. Kinetics of HCl reactions with calcium and sodium sorbents for IGCC fuel gas cleaning[J]. Chemical Engineering Science, 1996, 51(11): 2541-2546.
[13]	程正霖, 朱晓华, 李鹏飞. 高炉生产过程中氯的来源、迁移转化及影响[J]. 环境工程, 2021, 39(4): 86.
[14]	FAN Y, CHAI Y, WU J, et al. Behavior of coke in the blast furnace for smelting Bayan Obo Mine[J]. Fuel, 2022, 309: 122147.
[15]	吕凯. 高炉煤气中HCl脱除的热力学研究[D].唐山:河北联合大学, 2014.
[16]	PARTANEN J, BACKMAN P, BACKMAN R, et al. Absorption of HCl by limestone in hot flue gases. Part Ⅱ: importance of calcium hydroxychloride[J]. Fuel, 2005, 84(12): 1674-1684.
[17]	XIE W, LIU K, PAN WP, et al. Interaction between emissions of SO₂ and HCl in fluidized bed combustors[J]. Fuel, 1999, 78(12): 1425-1436.
[18]	罗鹏翔, 邓念东, 解耿, 等. 氯化钙激发粉煤灰基充填材料水化的机理及动力学特征[J]. 环境工程, 2023, 41(6): 62.
[19]	W NIMMO A A P, HALL W J, WILLIAMS P T. Characterization of a process for the in-furnace reduction of NO_x, SO₂, and HCl by carboxylic salts of calcium[J]. Industrial & Engineering Chemistry Research, 2005, 44(12): 4484-4494.
[20]	BIE R, LI S, YANG L. Reaction mechanism of CaO with HCl in incineration of wastewater in fluidized bed[J]. Chemical Engineering Science, 2005, 60(3): 609-616.
[21]	JIA Y, WANG Y, JIANG C, et al. Simultaneous enhancement of the H₂ yield and HCl removal efficiency from pyrolysis of infusion tube under novel mayenite-based mesoporous catalytic sorbents[J]. Energy, 2022, 244.
[22]	LIN Z L M W C. Reaction characteristics of Ca(OH)₂, HCl and SO₂ at low temperature in a spray dryer integrated with a fabric filter[J]. Journal of Hazardous Materials, 2002, 95(3): 291-304.
[23]	ZACH B, ŠYC M, SVOBODA K, et al. The influence of SO₂ and HCl concentrations on the consumption of sodium bicarbonate during flue gas treatment[J]. Energy & Fuels, 2021, 35(6): 5064-5073.
[24]	PAJDAK A, WALAWSKA B, SZYMANEK A. The effect of structure modification of sodium compounds on the SO₂ and HCl removal efficiency from fumes in the conditions of circulating fluidised bed[J]. Chemical and Biochemical Engineering Quarterly, 2017, 31: 261-273.
[25]	PARTANEN J, BACKMAN P, BACKMAN R, et al. Absorption of HCl by limestone in hot flue gases. Part Ⅲ: simultaneous absorption with SO₂[J]. Fuel, 2005, 84(12): 1685-1694.
[26]	PARTANEN J, BACKMAN P, BACKMAN R, et al. Absorption of HCl by limestone in hot flue gases. Part Ⅰ: the effects of temperature, gas atmosphere and absorbent quality[J]. Fuel, 2005, 84(12): 1664-1673.
[27]	LIANG S, FAN Z, ZHANG W, et al. Controllable growth of Na₂CO₃ fibers for mesoporous activated alumina ball modification towards the high-efficiency adsorption of HCl gas at low temperature[J]. RSC Advances, 2017, 7(84): 53306-53315.
[28]	LIANG S, FAN Z, ZHANG W, et al. Inexpensive metal oxides nanoparticles doped Na₂CO₃ fibers for highly selective capturing trace HCl from HCl/CO₂ mixture gas at low temperature[J]. Chemical Engineering Journal, 2018, 352(15): 634-643.
[29]	LIANG S, LIU S, FAN Z, et al. Enhanced HCl removal from CO^2- rich mixture gases by CuO_x/Na₂CO₃ porous sorbent at low temperature: kinetics and forecasting[J]. Chemical Engineering Journal, 2020, 381: 122738.
[30]	KAMEDA T, UCHIDA H, KUMAGAI S, et al. Influence of CO₂ gas on the rate and kinetics of HCl, SO₂, and NO₂ gas removal by Mg-Al layered double hydroxide intercalated with CO₃^2-[J]. Applied Clay Science, 2020, 195(15): 105725.