SO<sub>2</sub>对HCl在Ca (OH)<sub>2</sub>表面脱除的影响

梁宝瑞; 马梦莹; 苏伟; 李伟; 侯长江; 汪群慧

doi:10.13205/j.hjgc.202409021

SO₂对HCl在Ca (OH)₂表面脱除的影响

doi: 10.13205/j.hjgc.202409021

1. 北京科技大学天津学院, 天津 301830;
2. 北京科技大学能源与环境学院, 北京 100083;
3. 山东省淄博市博山区生态环境技术服务中心, 山东淄博 255200;
4. 河钢集团有限公司, 石家庄 050000

基金项目:

碳锰双功能催化剂低温协同脱除烧结烟气NO_x与UP-POPs研究(52270098)

烧结烟气协同脱除NO_x与Cl-VOCs催化剂的抗中毒性能及机理研究(20193236-09-06)

天津市教委科研计划项目(2022KJ032)

详细信息

作者简介:
梁宝瑞(1986-),男,博士,副教授,主要研究方向为大气污染控制工程。18910284067@126.com

通讯作者:
苏伟(1982-),男,博士,教授,主要研究方向为大气污染控制工程。suwei@ustb.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2023-12-20
- 网络出版日期: 2024-12-02

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

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

摘要

摘要: 使用Ca(OH)₂作为固体反应物去除工业烟气流中的HCl是一种简单而有效的工艺解决方案。实际应用中有很多种情景,需要将HCl预先脱除后再进行后续污染物治理。然而,烟气中的SO₂与HCl在碱性吸收剂上有本能的、强烈的竞争,造成了不利影响,使去除机制混乱,以往的研究尚未达成令人信服的共识。为了解决这一问题,在固定床反应器上设计了一系列实验来评估SO₂对吸收剂脱除HCl性能的影响。结合表征结果与热力学特征进一步研究了SO₂对HCl的竞争机理。结果表明,在Ca(OH)₂吸收剂表面HCl对活性位点竞争的优先性优于SO₂,从而HCl能够进入吸收剂内部继续反应。但在竞争过程中部分SO₂仍然能通过消耗Ca(OH)₂吸收剂表面的活性位点,形成产物层而降低表面活性,从而对HCl的脱除产生不利影响。这些发现有助于阐明烧结烟气中钙基吸收剂上SO₂与HCl的竞争机制。
- HCl /
- 碱性吸收剂 /
- SO₂ /
- Ca (OH)₂ /
- 固定床实验 /
- 脱除特性
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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