期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 418, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126380
关键词
Kinetics; Evolved gases; Fluorine; Leaching; Mineral transformations
资金
- National Natural Science Foundation of China [51978175, 41773130]
- Natural Sci-ence Foundation of Guangdong Province, China [2017A030310323]
- Scientific and Technological Planning Project of Guangzhou, China [202103000004]
- Research Fund Pro-gram of Guangdong Key Laboratory of Radioactive and Rare Resource Utilization [2018B030322009]
This study investigates the co-combustion of spent pot lining (SPL) with pulverized coal (PC) as a cost-effective method to reduce waste streams and environmental risks. The addition of PC enhances combustion efficiency of SPL, lowers leaching fluorine concentrations, and reduces gas emissions during waste-to-energy conversion.
In response to the global initiative for greenhouse gas emission reduction, the co-combustion of coal and spent pot lining (SPL) may cost-effectively minimize waste streams and environmental risks. This study aimed to quantify the emission-to-ash detoxification mechanisms of the co-combustion of SPL and pulverized coal (PC) and their kinetics, gas emission, fluorine-leaching toxicity, mineral phases, and migrations. The main reaction covered the ranges of 335-540 ?C and 540-870 ?C while the interactions occurred at 360-780 ?C. The apparent activation energy minimized (66.99 kJ/mol) with 90% PC addition. The rising PC fraction weakened the peak intensity of NaF and strengthened that of Ca2F, NaAlSiO4, and NaAlSi2O6. The addition of PC enhanced the combustion efficiency of SPL and raised the melting temperature by capturing Na. PC exhibited a positive effect on solidifying water-soluble fluorine and stabilizing alkali and alkaline earth metals. The leaching fluorine concentrations of the co-combustion ashes were lower than did SPL mono-combustion. The main gases emitted were HF, NH3, NOx, CO, and CO2. HF was largely released at above 800 ?C. Multivariate Gaussian process modelbased optimization of the operational conditions also verified the gas emissions results. Our study synchronizes the utilization and detoxification of SPL though co-combustion and provides insights into an eco-friendlier lifecycle control on the waste-to-energy conversion.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据