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

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