CO2与水蒸汽对焦炭溶损反应的影响

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 kJ/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 mm的气孔所占比例分别增加66.98%和94.01%，中心部位大于10 mm的气孔所占比例分别降低21.22%和3.30%.

Effects of CO2 and H2O on Solution Loss Reaction of Coke

The effects of CO2 and H2O on solution loss reaction of coke were studied in the temperature range of 950~1200℃ with self-made gas-solid reacting apparatus. The results showed that the gasification rate of coke reacting with H2O was about 2~7 times of that with CO2. The difference of gasification rate was narrow with rising of the temperature. The reaction process was controlled obviously by interfacial reaction, it could be described by the unreacted core shrinking mode. The activation energy of coke reacting with CO2 and H2O was 165.481 and 82.25 kJ/mol, respectively. The amount of solution loss decreased from the outside to the inside of coke particles with rising of the temperature. Compared with the reaction of coke with CO2, that with H2O occurred much more on the surface of coke. The pores in coke formed differently in its different parts. After reaction with CO2 and H2O, the proportion of pores with the sizes over 10 mm in coke increased 66.98% and 94.01% in the edge part of a coke particle, but that decreased 21.22% and 3.30% in the central part.