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SO2对HCl在Ca(OH)2表面脱除的影响

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

HClalkaline absorbentSO2Ca(OH)2fixed bed experimentremoval performance

梁宝瑞、马梦莹、苏伟、李伟、侯长江、汪群慧

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北京科技大学天津学院,天津 301830

北京科技大学能源与环境学院,北京 100083

山东省淄博市博山区生态环境技术服务中心,山东淄博 255200

河钢集团有限公司,石家庄 050000

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HCl 碱性吸收剂 SO2 Ca(OH)2 固定床实验 脱除特性

&&天津市教委科研计划项目&&

522700982022KJ03220193236-09-06

2024

环境工程
中冶建筑研究总院有限公司,中国环境科学学会环境工程分会

环境工程

CSTPCD
影响因子:0.958
ISSN:1000-8942
年,卷(期):2024.42(9)