Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (9): 4628-4635.DOI: 10.16085/j.issn.1000-6613.2022-2010

• Energy processes and technology • Previous Articles     Next Articles

Modification of CaSO4 oxygen carrier by Zhundong coal ash in chemical looping gasification and its mechanism

ZHU Jie1,2(), JIN Jing1,2(), DING Zhenghao1,2, YANG Huipan1,2, HOU Fengxiao3   

  1. 1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
    3.School of Energy and Power Engineering, North University of China, Taiyuan 030051, Shanxi, China
  • Received:2022-10-27 Revised:2022-11-18 Online:2023-09-28 Published:2023-09-15
  • Contact: JIN Jing

化学链气化中准东煤灰对CaSO4载氧体改性及其作用机理

朱杰1,2(), 金晶1,2(), 丁正浩1,2, 杨会盼1,2, 侯封校3   

  1. 1.上海理工大学能源与动力工程学院,上海200093
    2.上海市动力工程多相流与传热重点实验室,上海200093
    3.中北大学能源与动力工程学院,山西 太原030051
  • 通讯作者: 金晶
  • 作者简介:朱杰(1997—),男,硕士研究生,研究方向为化学链气化。E-mail:2579936484@qq.com
  • 基金资助:
    国家自然科学基金(51976129);山西省基础研究计划(202103021223197);上海市科委项目(23010503500)

Abstract:

Using CaSO4 as the oxygen carrier, the CaSO4-Ash composite oxygen carrier modified by Jiangjunmiao coal ash was prepared by mechanical mixing method. With the TG-MS device, the chemical looping gasification reaction characteristics of composite oxygen carrier CaSO4-Ash and Jiangjunmiao coal were investigated, and the action mechanism of Jiangjunmiao coal ash-modified CaSO4 oxygen carrier was studied. The results showed that Jiangjunmiao coal ash had a certain modification effect on CaSO4 oxygen carrier. At 900℃, the CaSO4-Ash composite oxygen carrier showed good reactivity and stability compared with the pure CaSO4 oxygen carrier. The amount of CO produced by the chemical chain gasification of the CaSO4-Ash composite oxygen carrier increased significantly, and the yield also more stable. X-ray diffraction (XRD) analysis showed that there were a small amount of Ca2Fe2O5 and Fe2O3 in the CaSO4-Ash composite oxygen carrier, which were attached to the surface of CaSO4 and promoted the effect of CaSO4 lattice oxygen migration as an intermediary for the transport of CaSO4 lattice oxygen. The lattice constant and lattice volume of pure CaSO4 oxygen carrier and modified CaSO4 oxygen carrier were calculated by Jade software, and combined with Raman and Electron Paramagnetic Resonance (EPR) characterization, the mechanism for Na+ to modify CaSO4 oxygen carrier in coal ash was proved. Through Scanning Electron Microscope (SEM) test, it was found that the surface pore structure of the modified CaSO4 oxygen carrier was clearer.

Key words: chemical looping gasification, CaSO4 oxygen carrier, Zhundong coal, coal ash modification

摘要:

以CaSO4为载氧体,采用机械混合法制备了将军庙煤灰修饰的CaSO4-Ash复合载氧体。借助TG-MS考察复合载氧体CaSO4-Ash与将军庙煤的化学链气化反应特性,并对将军庙煤灰改性CaSO4载氧体的作用机理进行了研究。结果表明:将军庙煤灰对CaSO4载氧体有一定的改性作用。900℃时,与纯CaSO4载氧体相比,CaSO4-Ash复合载氧体表现出良好的反应活性和稳定性,CaSO4-Ash复合载氧体化学链气化产生的CO量明显增多,产率也更加稳定。X射线衍射分析表明,CaSO4-Ash复合载氧体中存在少量的Ca2Fe2O5和Fe2O3,它们附着在CaSO4表面,作为CaSO4晶格氧传输的中介,起到促进CaSO4晶格氧迁移的效果。通过Jade软件计算纯CaSO4载氧体和改性后的CaSO4载氧体的晶格常数和晶格体积,并结合拉曼光谱和电子顺磁共振光谱表征,证明了煤灰中Na+改性CaSO4载氧体的机理。通过扫描电子显微镜测试,发现改性后的CaSO4载氧体表面孔径结构更加清晰。

关键词: 化学链气化, CaSO4载氧体, 准东煤, 煤灰改性

CLC Number: 

京ICP备12046843号-2;京公网安备 11010102001994号
Copyright © Chemical Industry and Engineering Progress, All Rights Reserved.
E-mail: hgjz@cip.com.cn
Powered by Beijing Magtech Co. Ltd