Flue Gas-Enhanced Water Leaching: AAEM Removal from Agricultural Organic Solid Waste and Fouling and Slagging Suppression during Its Combustion

Xiangxi Wang; Zhao Xiong; Xian Li; Zhenzhong Hu; Yibo Wang; Bing Peng; Jian Li; Bo Wei; Guangqian Luo; Hong Yao

doi:10.1021/acsomega.3c00690

Flue Gas-Enhanced Water Leaching: AAEM Removal from Agricultural Organic Solid Waste and Fouling and Slagging Suppression during Its Combustion

ACS Omega. 2023 Apr 28;8(18):16241-16250. doi: 10.1021/acsomega.3c00690. eCollection 2023 May 9.

Authors

Xiangxi Wang^{1

2}, Zhao Xiong¹, Xian Li¹, Zhenzhong Hu¹, Yibo Wang^{1

2}, Bing Peng¹, Jian Li², Bo Wei², Guangqian Luo¹, Hong Yao¹

Affiliations

¹ State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
² Key Laboratory of Coal Clean Conversion and Chemical Process Autonomous Region, School of Chemical Engineering and Technology, Xinjiang University, Urumqi 830000, China.

Abstract

Alkali and alkaline earth metals (AAEMs) in agricultural organic solid waste (AOSW) contribute to the fouling and slagging during its combustion. In this study, a novel flue gas-enhanced water leaching (FG-WL) method using flue gas as the heat and CO₂ source was proposed for effective AAEM removal from AOSW before combustion. The removal rate of AAEMs by FG-WL was significantly superior to that by conventional water leaching (WL) under the same pretreatment conditions. Furthermore, FG-WL also obviously reduced the release of AAEMs, S, and Cl during AOSW combustion. The ash fusion temperatures of the FG-WL-treated AOSW was higher than that of WL. The fouling and slagging tendency of AOSW greatly decreased through FG-WL treatment. Thus, FG-WL is a simple and feasible method for AAEM removal from AOSW and suppressing fouling and slagging during its combustion. Besides, it also provides a new pathway for the resource utilization of power plant flue gas.