不同彬县焦的水蒸气气化反应动力学研究

在常压，900℃～1050℃考察了彬县煤的三种焦样（常规方法制焦、快速热解焦和脱灰快速热解焦）在热天平上的水蒸气气化反应。考察了温度和焦种对水蒸气气化反应的影响。对比了三种焦的动力学参数和比表面积。结果表明,气化温度是影响煤焦气化反应速率的主要因素，提高50℃，反应速率增加一倍。快速热解焦的反应速率在相同反应条件下明显大于慢速焦。三种焦的表观活化能以快速焦最大，因而反应速率受温度的影响也最大，快速脱灰焦次之，慢速焦最小。

Steam gasification kinetics of Binxian chars prepared at different conditions

The steam gasification reactivity of 3 chars from rapid pyrolysis, slow pyrolysis of raw coal and rapid pyrolysis of demineralized coal was studied at 900℃～1050℃ and atmospheric pressure in thermal balance. At the same time, the kinetic parameters of three chars were calculated and the specific surface area was determined with carbon dioxide absorption at 273K. The results show that gasification rate increases with increasing temperature which is an important factor influencing the gasification rate. The gasification rate doubles with an increasing temperature of 50℃. The reactivity of demineralized char increases at the beginning of gasification and subsequently decreases at higher temperature. The reactivity of two rapid pyrolysis chars is far higher than that of char prepared at low heating rate. Ash in the char can catalyze the gasification reaction at early stage and obstructs the reaction at higher carbon conversion. For the activation energy values, the slow pyrolysis char is the smallest and the rapid pyrolysis char is the biggest. The original gasification reactivity shows independence on the specific surface area.