焦炭-水蒸气催化气化反应特性研究

Reaction characteristic of the coke catalytic gasification with steam

采用碱性待生剂为气化原料,考察焦炭与水蒸气催化气化反应特性。在消除内外扩散影响的前提下,探讨了气化反应温度、进水蒸汽、混合气体比例及气化时间对焦炭水蒸气催化气化反应的影响。结果表明,碱性待生剂上焦炭催化气化反应速率与气化反应温度成正比,进水蒸汽速率为2.5 L/min时,可基本消除水蒸气的扩散效应对焦炭催化气化反应的影响,碱性待生剂上焦炭转化率基本趋于稳定,气化反应时间30 min,可较好转化碱性待生剂上焦炭,产品气以H_(2)组成为主(含量约60%)。水蒸气/氧气混合气为气化剂可显著提高焦炭催化气化转化率,同时,氧气的加入会影响合成气组成。合成气中H 2和CO含量降低,CO_(2)含量升高。

The catalytic gasification of coke with steam was studied by using spent base catalysts as gasification raw material.On the premise of eliminating the influence of internal and external diffusion,the performance of gasification temperature,influent steam,gas mixture ratios and gasification time on the catalytic gasification of coke steam were discussed.The results show that the reaction rate of coke catalytic gasification on the base catalyst is proportional to gasification reaction temperature,and the effect of water vapor diffusion on the coke catalytic gasification can be basically eliminated,when the rate of inlet steam is 2.5 L/min.The conversion rate of coke on the alkaline reagent tends to be stable basically.The gasification reaction time is at least 30 min to achieve a better conversion of coke on the base spent catalyst.The product gas is mainly composed of H 2(approximately 60%).Steam/oxygen gasification reagent is used in the gasification reaction,which could obviously improve the conversion rate of the coke,and meanwhile affect the composition of synthesis gas.The content of H_(2)and CO in syngas decreased,while the content of CO_(2)increased.