Experimental and mechanistic study on chemical looping combustion of caking coal

doi:10.1016/j.cjche.2021.01.013

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 89-96.DOI: 10.1016/j.cjche.2021.01.013

• Chemical Engineering Thermodynamics • 上一篇下一篇

Experimental and mechanistic study on chemical looping combustion of caking coal

Xiuli Zhang¹, Zhengdong Gao¹, Yongzhuo Liu¹, Yuanhao Hou¹, Xiaoqing Sun¹, Qingjie Guo^1,2

1. Key Laboratory of Clean Chemical Processing of Shandong Province, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
2. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China

收稿日期:2020-08-13 修回日期:2020-12-21 出版日期:2021-09-28 发布日期:2021-11-02
通讯作者: Qingjie Guo
基金资助:
The authors gratefully acknowledge the support from the National Key Research and Development Program of China (2018YFB06050401), Key Research and Development Program of the Ningxia Hui Autonomous Region (2018BCE01002), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2019-KF30, 2019-KF33).

Experimental and mechanistic study on chemical looping combustion of caking coal

Xiuli Zhang¹, Zhengdong Gao¹, Yongzhuo Liu¹, Yuanhao Hou¹, Xiaoqing Sun¹, Qingjie Guo^1,2

1. Key Laboratory of Clean Chemical Processing of Shandong Province, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
2. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, College of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China

Received:2020-08-13 Revised:2020-12-21 Online:2021-09-28 Published:2021-11-02
Contact: Qingjie Guo
Supported by:
The authors gratefully acknowledge the support from the National Key Research and Development Program of China (2018YFB06050401), Key Research and Development Program of the Ningxia Hui Autonomous Region (2018BCE01002), and the Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2019-KF30, 2019-KF33).

摘要/Abstract

摘要： Under high-temperature batch fluidized bed conditions and by employing Juye coal as the raw material, the present study determined the effects of the bed material, temperature, OC/C ratio, steam flow and oxygen carrier cycle on the chemical looping combustion of coal. In addition, the variations taking place in the surface functional groups of coal under different reaction times were investigated, and the variations achieved by the gas released under the pyrolysis and combustion of Juye coal were analyzed. As revealed from the results, the carbon conversion ratio and rate were elevated significantly, and the volume fraction of the outlet CO₂ remained more than 92% under the oxygen carriers. The optimized reaction conditions to achieve the chemical looping combustion of Juye coal consisted of a temperature of 900℃, an OC/C ratio of 2, as well as a steam flow rate of 0.5 g·min^-1. When the coal was undergoing the chemical looping combustion, volatiles primarily originated from the pyrolysis of aliphatic CH₃ and CH₂, and CO and H₂ were largely generated from the gasification of aromatic carbon. In the CLC process, H₂O and CO₂ began to separate out at 270℃, CH₄ and tar began to precipitate at 370℃, and the amount of CO₂ was continuously elevated with the rise of the temperature.

关键词: Caking coal, Chemical looping combustion, Optimized reaction conditions, TG-FTIR

Abstract: Under high-temperature batch fluidized bed conditions and by employing Juye coal as the raw material, the present study determined the effects of the bed material, temperature, OC/C ratio, steam flow and oxygen carrier cycle on the chemical looping combustion of coal. In addition, the variations taking place in the surface functional groups of coal under different reaction times were investigated, and the variations achieved by the gas released under the pyrolysis and combustion of Juye coal were analyzed. As revealed from the results, the carbon conversion ratio and rate were elevated significantly, and the volume fraction of the outlet CO₂ remained more than 92% under the oxygen carriers. The optimized reaction conditions to achieve the chemical looping combustion of Juye coal consisted of a temperature of 900℃, an OC/C ratio of 2, as well as a steam flow rate of 0.5 g·min^-1. When the coal was undergoing the chemical looping combustion, volatiles primarily originated from the pyrolysis of aliphatic CH₃ and CH₂, and CO and H₂ were largely generated from the gasification of aromatic carbon. In the CLC process, H₂O and CO₂ began to separate out at 270℃, CH₄ and tar began to precipitate at 370℃, and the amount of CO₂ was continuously elevated with the rise of the temperature.

Key words: Caking coal, Chemical looping combustion, Optimized reaction conditions, TG-FTIR

Xiuli Zhang, Zhengdong Gao, Yongzhuo Liu, Yuanhao Hou, Xiaoqing Sun, Qingjie Guo. Experimental and mechanistic study on chemical looping combustion of caking coal[J]. 中国化学工程学报, 2021, 37(9): 89-96.

Xiuli Zhang, Zhengdong Gao, Yongzhuo Liu, Yuanhao Hou, Xiaoqing Sun, Qingjie Guo. Experimental and mechanistic study on chemical looping combustion of caking coal[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 89-96.

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Experimental and mechanistic study on chemical looping combustion of caking coal

Experimental and mechanistic study on chemical looping combustion of caking coal

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