NO removal performance of CO in carbonation stage of calcium looping for CO2 capture

doi:10.1016/j.cjche.2021.03.051

中国化学工程学报 ›› 2021, Vol. 37 ›› Issue (9): 30-38.DOI: 10.1016/j.cjche.2021.03.051

• Separation Science and Engineering • 上一篇下一篇

NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture

Wan Zhang¹, Yingjie Li¹, Yuqi Qian¹, Boyu Li¹, Jianli Zhao¹, Zeyan Wang²

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

收稿日期:2020-08-31 修回日期:2021-01-04 出版日期:2021-09-28 发布日期:2021-11-02
通讯作者: Yingjie Li
基金资助:
Financial supports from the National Natural Science Foundation of China (51876105), the Joint Foundation of National Natural Science Foundation of China and Shanxi Province for coal-based low carbon (U1510130), Shandong Provincial Natural Science Foundation (ZR2020ME188), the Fundamental Research Funds of Shandong University (2018JC039) and the program for Outstanding PhD candidate of Shandong University are gratefully appreciated.

NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture

Wan Zhang¹, Yingjie Li¹, Yuqi Qian¹, Boyu Li¹, Jianli Zhao¹, Zeyan Wang²

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China

Received:2020-08-31 Revised:2021-01-04 Online:2021-09-28 Published:2021-11-02
Contact: Yingjie Li
Supported by:
Financial supports from the National Natural Science Foundation of China (51876105), the Joint Foundation of National Natural Science Foundation of China and Shanxi Province for coal-based low carbon (U1510130), Shandong Provincial Natural Science Foundation (ZR2020ME188), the Fundamental Research Funds of Shandong University (2018JC039) and the program for Outstanding PhD candidate of Shandong University are gratefully appreciated.

摘要/Abstract

摘要： Calcium looping realizes CO₂ capture via the cyclic calcination/carbonation of CaO. The combustion of fuel supplies energy for the calciner. It is unavoidable that some unburned char in the calciner flows into the carbonator, generating CO due to the hypoxic atmosphere in the carbonator. CO can reduce NO in the flue gases from coal-fired power plants. In this work, NO removal performance of CO in the carbonation stage of calcium looping for CO₂ capture was investigated in a bubbling fluidized bed reactor. The effects of carbonation temperature, CO concentration, CO₂ capture, type of CaO, number of CO₂ capture cycles and presence of char on NO removal by CO in carbonation stage of calcium looping were discussed. CaO possesses an efficient catalytic effect on NO removal by CO. High temperature and high CO concentration lead to high NO removal efficiency of CO in the presence of CaO. Taking account of better NO removal and CO₂ capture, the optimal carbonation temperature is 650℃. The carbonation of CaO reduces the catalytic activity of CaO for NO removal by CO due to the formation of CaCO₃. Besides, the catalytic performance of CaO on NO removal by CO gradually decreases with the number of CO₂ capture cycles. This is because the sintering of CaO leads to the fusion of CaO grains and blockage of pores in CaO, hindering the diffusion of NO and CO. The high CaO content and porous structure of calcium-based sorbents are beneficial for NO removal by CO. The presence of char promotes NO removal by CO in the carbonator. CO₂/NO removal efficiencies can reach above 90%. The efficient simultaneous NO and CO₂ removal by CO and CaO in the carbonation step of the calcium looping seems promising.

关键词: Sorbents, Carbon monoxide, CO₂ capture, NO removal, Carbonation stage, Calcium looping

Abstract: Calcium looping realizes CO₂ capture via the cyclic calcination/carbonation of CaO. The combustion of fuel supplies energy for the calciner. It is unavoidable that some unburned char in the calciner flows into the carbonator, generating CO due to the hypoxic atmosphere in the carbonator. CO can reduce NO in the flue gases from coal-fired power plants. In this work, NO removal performance of CO in the carbonation stage of calcium looping for CO₂ capture was investigated in a bubbling fluidized bed reactor. The effects of carbonation temperature, CO concentration, CO₂ capture, type of CaO, number of CO₂ capture cycles and presence of char on NO removal by CO in carbonation stage of calcium looping were discussed. CaO possesses an efficient catalytic effect on NO removal by CO. High temperature and high CO concentration lead to high NO removal efficiency of CO in the presence of CaO. Taking account of better NO removal and CO₂ capture, the optimal carbonation temperature is 650℃. The carbonation of CaO reduces the catalytic activity of CaO for NO removal by CO due to the formation of CaCO₃. Besides, the catalytic performance of CaO on NO removal by CO gradually decreases with the number of CO₂ capture cycles. This is because the sintering of CaO leads to the fusion of CaO grains and blockage of pores in CaO, hindering the diffusion of NO and CO. The high CaO content and porous structure of calcium-based sorbents are beneficial for NO removal by CO. The presence of char promotes NO removal by CO in the carbonator. CO₂/NO removal efficiencies can reach above 90%. The efficient simultaneous NO and CO₂ removal by CO and CaO in the carbonation step of the calcium looping seems promising.

Key words: Sorbents, Carbon monoxide, CO₂ capture, NO removal, Carbonation stage, Calcium looping

Wan Zhang, Yingjie Li, Yuqi Qian, Boyu Li, Jianli Zhao, Zeyan Wang. NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture[J]. 中国化学工程学报, 2021, 37(9): 30-38.

Wan Zhang, Yingjie Li, Yuqi Qian, Boyu Li, Jianli Zhao, Zeyan Wang. NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 30-38.

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NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture

NO removal performance of CO in carbonation stage of calcium looping for CO₂ capture

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