A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor
A kinetic study on lignite char gasification with CO2 and H2O in a fluidized bed reactor
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流化床反应器中 CO2 和 H2O 褐煤焦气化动力学研究
DOI：
10.1016/j.applthermaleng.2018.10.113
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发表时间：
2019-01
影响因子：
6.4
通讯作者：
Anthony Edward John
中科院分区：
文献类型：
--
作者：
Tong Shuai;Li Lin;Duan Lunbo;Zhao Changsui;Anthony Edward John
在1060 ~ 1210 K温度范围内，在CO2、H2O及其混合物中进行了褐煤炭气化实验。分离了不同气化剂在CO2/H2O混合物中占据的活性位点，并对其动力学进行了分析。结果表明，随着温度的升高，气化反应性迅速提高。50%CO2/50%H2O混合气中的平均反应速率比50%N2/50%H2O气氛中的反应速率慢，说明co2和H2O在焦炭表面竞争相同的活性反应位点。此外，随着温度的升高，co2气化对H2O的竞争能力逐渐增强，因此，当温度高于1160 K时，co2气化比H2O占据更多的活性位点。根据缩核模型计算动力学控制区的活化能，结果表明：N2/CO2> N2/H2O > CO2/H2O。
Lignite char gasification experiments in CO2, H2O and their mixture were performed in a fluidized bed reactor over the temperatures range of 1060–1210 K. The active sites occupied by different gasifying agents in CO2/H2O mixture were separated and the kinetics was analyzed. Results show that the reactivity of gasification increases rapidly as the temperature rises. The average reaction rate in 50%CO2/50%H2O mixture is slower than the reaction rate in 50%N2/50%H2O atmosphere, which indicates that CO2and H2O compete for the same active reaction sites on the char surface. Furthermore, with an increase of temperature, the competition capacity of CO2gasification over H2O gradually increases, as a result, CO2gasification occupies more active sites than H2O when the temperature is higher than 1160 K. Calculations of the activation energy in the kinetically controlled region based on the shrinking core model reveal that the activation energies follow the trend: N2/CO2> N2/H2O > CO2/H2O.
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