酸改性复合氧载体CaSO4-CaO的反应性能

doi:10.16085/j.issn.1000-6613.2017-1264

化工进展 ›› 2018, Vol. 37 ›› Issue (04): 1426-1432.DOI: 10.16085/j.issn.1000-6613.2017-1264

酸改性复合氧载体CaSO₄-CaO的反应性能

钟思梅^1,2, 郑敏^1,2, 邢艳彬^1,3, 蒲思旭^1,2

1 省部共建复杂有色金属资源清洁利用国家重点实验室, 云南昆明 650093;
2 昆明理工大学冶金与能源工程学院, 云南昆明 650093;
3 昆明理工大学化学工程学院, 云南昆明 650093

收稿日期:2017-06-26 修回日期:2017-09-02 出版日期:2018-04-05 发布日期:2018-04-05
通讯作者: 郑敏,副教授,主要从事化学链燃烧的研究。
作者简介:钟思梅(1991-),女,硕士研究生。E-mail:18788405073@163.com。
基金资助:
国家自然科学基金项目（51306084，51374004）。

Reactivity performance of acid-modified oxygen carrier CaSO₄-CaO

ZHONG Simei^1,2, ZHENG Min^1,2, XING Yanbin^1,3, PU Sixu^1,2

1 State Key Laboratory of Complex Metal Resources Clean Utilization, Kunming 650093, Yunnan, China;
2 Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China;
3 Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

Received:2017-06-26 Revised:2017-09-02 Online:2018-04-05 Published:2018-04-05

摘要/Abstract

摘要： 将CaO添加到经不同酸改性后的CaSO₄氧载体中来制备CaSO₄-CaO复合氧载体。采用XRD、H₂-TPR、CO小型卧式管式炉开展恒温反应和循环实验，对氧载体进行表征和评价。主要研究了酸的种类对CO₂生成、气体硫化物的释放及复合氧载体循环反应性能的影响。结果表明：酸化的复合氧载体的氢气还原活性均明显优于未经改性过的CaSO₄，相比无酸化处理的CaSO₄氧载体，酸化后的CaSO₄-CaO复合氧载体，特别是HCl酸化，主要是提高了CaSO₄竞争还原副反应的选择性，导致主要气体硫化物SO₂释放显著增加，而COS释放略有降低。以CaCO₃煅烧得到的CaO与经HNO₃改性的CaSO₄进行机械混合制得的复合氧载体具有较好的反应活性，但是经过6次循环反应后，还原反应活性下降；循环反应中，气体硫化物主要来自于CaSO₄在还原阶段释放出的SO₂。

关键词: 复合氧载体, 酸改性, CO₂捕集, 反应活性, SO₂释放, COS释放

Abstract: CaSO₄-CaO combined oxygen carrier was prepared by mixing mechanically. The CaSO₄ was modified with different types of acid. The characterizations and evaluation of modified CaSO₄-CaO oxygen carrier were studied using XRD,H₂-TPR,and a small tube furnace reactor. The effect of acid types on CaSO₄ reductive reactivity,CO₂ generation,SO₂ and COS releases were studied. It was founded that the reactivity of acid-modified CaSO₄-CaO oxygen carrier was obviously higher than that without preparation; the use of acid mainly increased the selectivity of side competitive reactions of CaSO₄ reductions,which resulted in the emission of SO₂ increased remarkably,and the release of COS dropped somewhat. CaSO₄-CaO combined oxygen carrier,which CaO was from the CaCO₃ calcination and CaSO₄ was modified with HNO₃,had good reactivity. So its cycle performance was studied. However,the reactivity decreased after 6th reduction-oxidation cycle. During the cycle test,SO₂ was the main gas sulfides which was released during reduction phase.

Key words: combined oxygen carrier, acid modification, CO₂ capture, reactive activity, SO₂ release, COS release

中图分类号:

TE624.31

钟思梅, 郑敏, 邢艳彬, 蒲思旭. 酸改性复合氧载体CaSO₄-CaO的反应性能[J]. 化工进展, 2018, 37(04): 1426-1432.

ZHONG Simei, ZHENG Min, XING Yanbin, PU Sixu. Reactivity performance of acid-modified oxygen carrier CaSO₄-CaO[J]. Chemical Industry and Engineering Progress, 2018, 37(04): 1426-1432.

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酸改性复合氧载体CaSO₄-CaO的反应性能

Reactivity performance of acid-modified oxygen carrier CaSO₄-CaO

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