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采用自制气-固相反应测定仪,于950?1200℃温度范围内研究了焦炭与CO2、水蒸汽的溶损反应.结果表明,焦炭与水蒸汽反应的气化率约为与CO2反应的2?7倍,随温度升高,二者气化率差距缩小;焦炭与CO2或水蒸汽的反应过程受界面反应控制较明显,可用未反应收缩核模型描述,反应的活化能分别为165.48和82.25 k J/mol;随温度升高,焦炭颗粒由外到内溶损量呈减少趋势,焦炭与水蒸汽反应比与CO2反应更多发生在颗粒表面;不同部位气孔生成方式不同,焦炭与CO2、水蒸汽反应后,边缘部位大于10?m的气孔所占比例分别增加66.98%和94.01%,中心部位大于10?m的气孔所占比例分别降低21.22%和3.30%.
The self-made gas-solid phase reaction detector was used to study the dissolution reaction of coke with CO2 and water vapor in the temperature range of 950-1200 ℃ .The results showed that the gasification rate of coke and water vapor was about 2 ? 7 times, with the temperature increases, the gap between the two gasification rate reduced; coke and CO2 or water vapor reaction controlled by the interface reaction is more obvious, available unreacted core model of the nuclear reaction, the reaction activation energy was 165.48 and 82.25 k J / mol. With the increase of temperature, the volume loss of coke particles decreases from the outside to the inside, and the reaction ratio of coke to water vapor and CO2 are more on the particle surface. The proportion of stomata with edge larger than 10 μm increased by 66.98% and 94.01% respectively after water vapor reaction, while the proportion of stomata with center larger than 10 μm decreased by 21.22% and 3.30% respectively.