Improved slagging characteristics of low-value solid waste fuel asphalt rock by mineral additives of CaCO_(3),MgO,and Kaolin under fluidized bed condition  

作　　者：Jiatao Xiang Xiong Zhang Fan Yi Shihong Zhang Haiping Yang Jing’ai Shao Xianhua Wang Hanping Chen 

机构地区：[1]State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China [2]Department of New Energy Science and Engineering,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan,430074,China

出　　处：《Waste Disposal and Sustainable Energy》2024年第3期385-400,共16页废弃物处置与可持续能源（英文）

基　　金：the Natural Science Foundation of China(Nos.52176187,51976075);the National Natural Science Funds for Distinguished Young Scholar(No.52125601).

摘　　要：As a low-value solid waste fuel,asphalt rock is prone to slagging even under fluidized bed condition.The purpose of this study is to improve the slagging characteristics of asphalt rock by adding the mineral additives CaCO_(3),MgO,and Kaolin.The results showed that the K,Al,Ca salts in asphalt rock ash will evolve at different temperatures and exist mainly as K_(2)SO_(4),KAlSiO_(4),Al_(2)O_(3)·SiO_(2),Al_(2)O_(3),CaSO_(4),and CaSiO_(3).The CaSO_(4) formed from sulfur oxides and calcium-containing compounds is the main factor in asphalt rock slagging and can be facilitated by CaSiO_(3) with a small amount of CaCO_(3).The MgO can form MgCa(SiO_(3))_(2) with a high melting point and helps raise the ash fusion temperatures.In addition,the Kaolin will promote the formation of low-temperature eutectics,resulting in a slight decrease in ash fusion temperatures.Through optimization,it was found that with the addition of 9.0%MgO+9.0%Kaolin+2.0%CaCO_(3)(in weight),the slagging ratio and pressure difference of asphalt rock under fluidized bed conditions decreased from 6.5% to 4.2% and from 6.0 Pa to 4.0 Pa,respectively.By combining simulation and experimental methods,it has been shown that appropriate mineral additives of CaCO_(3),MgO,and Kaolin can effectively improve the slagging characteristics of asphalt rock.

关 键 词：Asphalt rock Mineral additives Slagging ratio Pressure difference Fluidized bed 

分 类 号：X705[环境科学与工程—环境工程]