Emission-to-ash detoxification mechanisms of co-combustion of spent pot lining and pulverized coal
Yükleniyor...
Dosyalar
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
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.
Açıklama
National Natural Science Foundation of China(National Natural Science Foundation of China (NSFC)); Natural Sci-ence Foundation of Guangdong Province, China(National Natural Science Foundation of Guangdong Province); Scientific and Technological Planning Project of Guangzhou, China; Research Fund Pro-gram of Guangdong Key Laboratory of Radioactive and Rare Resource Utilization
Anahtar Kelimeler
Kinetics, Evolved Gases, Fluorine, Sewage-Sludge, Combustion Behaviors, Kinetics
Kaynak
Journal of Hazardous Materials
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
418
Sayı
Künye
Chen, Z., Liu, J., Chen, L., Evrendilek, F., Xie, W., Wu, X., ... & Li, W. (2021). Emission-to-ash detoxification mechanisms of co-combustion of spent pot lining and pulverized coal. Journal of Hazardous Materials, 418, 126380.
