Co-combustion characteristics and kinetics of meager coal and spent cathode carbon block by TG-MS analysis

Arabian Journal of Chemistry

Yingjie Li¹  Kuihua Han²  Meimei Wang³  Jigang Zhang³  Zhaocai Teng³ 

[1]School of Energy and Power Engineering, Shandong University, Jinan, 250061, China

[2]Corresponding author at: No.17923 Jingshi Road, Lixia District, Jinan, Shandong Province 250061, China.

[3]School of Energy and Power Engineering, Shandong University, Jinan, 250061, China

关键词: Meager coal;    Spent cathode carbon block;    Combustion characteristics;    Kinetics;    TG-MS;    Interaction;   

DOI  :  

来源: DOAJ

【 摘 要 】

As a hazardous waste, the spent cathode carbon block (SCCB) has a high calorific value while it is difficult to fire, its harmless disposal is a major difficulty at present. Herein, a method of mixed combustion of meager coal and SCCB in a pulverized coal furnace for disposal of SCCB is proposed, and thermogravimetric mass spectrometry (TG-MS) is used to characterize the combustion and gas release characteristics. The effects of the heating rate and mixing ratio on combustion are analyzed as well. The result shows that the comprehensive combustibility index and combustion stability index of SCCB-5 at a heating rate of 50 °C/min are both the highest. Abundant oxygen-containing groups in SCCB promote the co-combustion process. The release of hydrogen fluoride is relatively low below 1000 °C so that the use of pulverized coal boilers meets the temperature requirement for disposal of SCCB. The good melting characteristics of ash after mixing sintering also confirm this point. Finally, the kinetic calculation results show that the combustion activation energy is the lowest when the mixing ratio is 5%, which is in good agreement with the experimental results. The highest activation energy values for the combustion of meager coal, SCCB and SCCB-5 are 46.90, 89.39, 59.87 kJ mol−1, respectively.

【 授权许可】

Unknown