封面图片
2016年, 第10卷 第4期
(Renxing Wang, Zhenyu Liu, Leiming Ji, Xiaojin Guo, Xi Lin, Junfei Wu, Qingya Liu, pp. 517-525)
Production of calcium carbide (CaC2) from coal-derived coke and lime is still an important coal-to-chemical process today. The autothermal technologies with pulverized coke and lime or pelletized feed have been developed for this process in recent years to replace the traditional electric arc technology due to reduction in energy consumption and CO2 emission. Reaction kinetics of these feeds required for simulation and design of reactors and process are limited and contradictive in the literature. Based on the reaction data obtained by TGA at 17001850°C applicable to industry, the kinetic model is determined with the isoconversional and model-fitting methods. It is found that the process is mainly influenced by heat transfer from the environment to the feed. The larger geometrical surface area of the powder feed yields a higher CaC2 formation rate in comparison with the pelletized feed. The reaction kinetics of both feeds can be described by the contracting volume model. The apparent activation energy and the pre-exponential factor of the pulverized feed are 353 kJ∙mol−1 and 5.9 × 107 min−1, respectively, while those of the pelletized feed are 305 kJ∙mol−1 and 3.6×106 min−1, respectively.
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ISSN 2095-0179 (Print)
ISSN 2095-0187 (Online)
CN 11-5981/TQ
Postal Subscription Code 80-969 Formerly Known as Frontiers of Chemical Science and Engineering in China 2018 Impact Factor: 2.809