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采用自制高温气固相反应连续测定装置,研究了900～1100℃下,CO2,H2O及其混合气体与焦炭的溶损反应.结果表明,焦炭与H2O反应的溶损率远高于其与CO2反应后的溶损率,前者是后者的2～5倍.相比与CO2的反应,焦炭与H2O的反应在颗粒外围更为剧烈,且不易在中心部位生成大的串孔及裂纹.900℃时,与CO2、H2O反应开始的焦炭的主要气化方式分别为微孔生成、小孔扩张;1100℃时,分别为小孔扩张、微孔生成.随着混合气体中H2O含量的增加,焦炭的溶损率不断增加.当[H2O]/[CO2]=5/5和7/3时,焦炭与混合气体的共气化过程中均产生了明显的交互作用.用缩核反应模型描述了焦炭与H2O和CO2气化反应的结果,得反应活化能分别为154.47和214.77kJ/mol.
The dissolution kinetics of CO2, H2O and their mixed gases with coke at 900 ~ 1100 ℃ were studied by a self-made high temperature gas-solid reaction continuous measurement device.The results showed that the dissolution rate of coke reacted with H2O was much higher than that of CO2 and H2O After the reaction, the former one is 2 to 5 times of that of the latter.Compared with the reaction with CO2, the reaction between coke and H2O is more intense in the periphery of the particles and it is not easy to generate large string holes and cracks in the center. ℃, the main gasification modes of coke started with CO 2 and H 2 O are respectively micropores, and the pores expand at 1100 ℃ .The pores are expanded and micropores are formed at 1100 ℃ respectively.With the increase of H 2 O content in the mixed gas, When [H2O] / [CO2] = 5/5 and 7/3, there is a significant interaction between coke and co-gasification of co-gas mixture. As a result of the coke reaction with H2O and CO2, the reaction activation energies were 154.47 and 214.77 kJ / mol, respectively.