ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Effects of CaO-MgCO₃ on the combustion behavior and emission properties of SO₂ and NO_x during semi-coke combustion

Gui-lin Wu, Rui-tang Guo, Yuan-zhen Liu, Chao-peng Duan, Yu-fang Miao, Jing-wen Gu, and Wei-guo Pan

School of Energy Source and Mechanical Engineering, Shanghai University of Electric Power, Shanghai, People’s Republic of China

E-mail: grta@zju.edu.cn

Received: 7 October 2020  Accepted: 8 January 2021

Abstract:

The effect of CaO-MgCO₃ additives on the combustion property of semi-coke (SC) was investigated using thermogravimetric analysis. Based on the experimental results, the addition of CaO (Ca/S = 2) on SC could reduce the ignition temperature (about 1.3 °C) and burnout temperature (about 0.99 °C). Besides, the additive of CaO on SC had significantly decreased the emissions of SO₂ and NO_x. However, the addition of 1 wt% MgCO₃ on SC-CaO could promote the burning process and remarkably reduce the ignition temperature (about 10 °C) and burnout temperature (about 8.64 °C). Moreover, the smallest activation energy was available for the combustion of SC-CaO-1 wt% MgCO₃. On the other hand, the addition of MgCO₃ with different content (0.5 wt%, 1 wt%, 2 wt%, 4 wt%) on SC-CaO could enhance the pore size of CaO, promote the sulfur fixation performance. Comparing with other SC-CaO-MgCO₃ samples, the addition of appropriate amount of MgCO₃ (1 wt%) could effectively promote the catalytic desulfuration and denitrification of CaO. Therefore, CaO-1 wt% MgCO₃ could effectively inhibit SO₂ and NO_x emission, which had great potential to be an efficient and clean method for the large-scale utilization of semi-coke.

Keywords: Semi-coke; MgCO3; Additive; Combustion; NOx; SO2; Emission

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01507-z

Chemical Papers 75 (6) 2495–2501 (2021)