超声波辅助氧化改性钙基吸收剂的制备及性能研究

doi:10.11896/cldb.21010211

材料导报

2022, Vol. 36

Issue (2): 21010211-5 https://doi.org/10.11896/cldb.21010211

无机非金属及其复合材料

超声波辅助氧化改性钙基吸收剂的制备及性能研究

任智翔¹, 杨康^1,2,3, 李肽脂¹, 迂晨¹, 詹华¹, 吴锋^1,2,3, 李辉^1,2,3

1 西安建筑科技大学材料科学与工程学院,西安 710055
2 陕西省生态水泥混凝土工程技术研究中心,西安 710055
3 教育部生态水泥工程研究中心,西安 710055

Preparation of Ultrasonic Impregnated Oxidized Calcium-based Absorbent and Its Desulfurization and Denitrification Properties

REN Zhixiang¹, YANG Kang^1,2,3, LI Taizhi¹, YU Chen¹, ZHAN Hua¹, WU Feng^1,2,3, LI Hui^1,2,3

1 College of Materials Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2 Shaanxi Ecological Cement Concrete Engineering Research Center, Xi'an 710055, China
3 Ecological Cement Engineering Research Center of Ministry of Education, Xi'an 710055, China

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摘要通过超声波辅助溶液浸渍的方法,将K₂S₂O₈、Ca(ClO)₂、(NH₄)₄Ce(SO₄)₄及K₂Cr₂O₇等氧化剂分别浸渍在钙基吸收剂表面,形成具有氧化性的活性位点,即氧化位点,改善钙基吸收剂脱除NO_x的效果。通过正交实验,在不同超声波功率、浸渍时间和浸渍温度下,按照一定掺杂比例,利用氧化剂对钙基吸收剂进行化学调质。将改性后钙基吸收剂在固定床反应器上进行了同时脱硫脱硝实验,选择污染物的平均脱除率作为评价指标。正交实验结果表明:以Ca(ClO)₂作为氧化剂进行超声波浸渍改性效果最好,最优改性工艺参数为氧化剂掺杂比例20%(质量分数,下同)、超声波功率100%、浸渍时间1.5 h、浸渍温度70 ℃。同时,基于晶相结构(XRD)分析和扫描电镜(SEM)显微形貌观测,可知超声波辅助氧化改性的方法能有效改善钙基吸收剂表面形貌,表面上形成了氧化位点,该氧化位点不仅能够增大吸收剂与SO₂和NO_x的接触,还能促进NO氧化为NO₂,进一步提高SO₂和NO_x的脱除率。

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	任智翔
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	吴锋
	李辉

关键词: 钙基吸收剂超声波浸渍氧化脱硫脱硝化学调质

Abstract: In this work, the oxidants such as K₂S₂O₈, Ca(ClO)₂, (NH₄)₄Ce(SO₄)₄ and K₂Cr₂O₇ were impregnated on the surface of calcium-based absorbent by ultrasonic-assisted solution impregnation method, and the active sites with oxidation were formed to improve the effect of cal-cium-based absorbent on NO_x removal. Through orthogonal experiment, under different ultrasonic power, impregnation time and impregnation temperature, the calcium-based absorbent was chemically modified by oxidant according to a certain doping ratio. The simultaneous desulfurization and denitrification experiments of modified calcium-based absorbent were carried out in a fixed bed reactor, and the average removal rate of pollutants was selected as the evaluation index. The orthogonal experiment results showed that Ca(ClO)₂ was the best oxidant for ultrasonic impregnation modification. The optimal modification process parameters were as follows: the oxidant doping ratio of 20%, the ultrasonic power of 100%, the impregnation time of 1.5 h, and the impregnation temperature of 70 ℃. At the same time, based on the crystal structure (XRD) analysis and scanning electron microscopy (SEM), it can be seen that the ultrasonic-assisted oxidation modification method can effectively improve the surface morphology of calcium-based absorbent, and the oxidation sites are formed on the surface. On the one hand, it can increase the contact between the absorbent and SO₂ and NO_x, on the other hand, it can promote the oxidation of NO to NO₂, and further improve the removal rate of both.

Key words: calcium-based absorbent ultrasonic impregnation oxidation desulfurization and denitrification chemical conditioning

出版日期: 2022-01-25 发布日期: 2022-01-26

ZTFLH:

TB332

基金资助: 陕西省教育厅 2020 年度重点科学研究计划(协同创新中心项目)(20JY041);清远市科技计划项目(2020KJJH040)

通讯作者: sunshineli@vip.sina.com21010211-1

作者简介: 任智翔,2018年6月毕业于青岛理工大学,获得工科学士学位。于2018年9月至今在西安建筑科技大学进行硕士阶段学习,主要从事烟气多污染物协同控制领域的研究。李辉,西安建筑科技大学材料科学与工程学院院长,教授。从1997年6月至今,担任西安建筑科技大学材料科学与工程学院材料科学与工程专业、资源循环科学与工程专业教师,先后任助教、讲师、副教授、教授。她所带领的废弃物资源化利用与生态材料低碳制备团队致力于资源化利用固体废弃物制备新型生态胶凝材料、混凝土材料新技术和新工艺,以及生态环境保护与修复新技术和新工艺等方面的研发与推广工作。目前主持国家重大专项课题1项,国家自然科学基金项目3项,其他省部级课题多项。获国家科技进步二等奖1项,陕西省科学技术一等奖2项,获准授权发明专利13项,发表研究论文150余篇。

引用本文:

任智翔, 杨康, 李肽脂, 迂晨, 詹华, 吴锋, 李辉. 超声波辅助氧化改性钙基吸收剂的制备及性能研究[J]. 材料导报, 2022, 36(2): 21010211-5.
REN Zhixiang, YANG Kang, LI Taizhi, YU Chen, ZHAN Hua, WU Feng, LI Hui. Preparation of Ultrasonic Impregnated Oxidized Calcium-based Absorbent and Its Desulfurization and Denitrification Properties. Materials Reports, 2022, 36(2): 21010211-5.

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http://www.mater-rep.com/CN/10.11896/cldb.21010211 或 http://www.mater-rep.com/CN/Y2022/V36/I2/21010211

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