伊宁煤焦固定床等温水蒸气气化特性研究  

Isothermal steam gasification characteristics of Yining coal char in a fixed bed reactor

作　　者：陈鸿伟[1] 闫景波[1] 张梅有[2] 张志才[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]宁夏电力公司教育培训中心,宁夏银川750001

出　　处：《热力发电》2014年第4期63-68,共6页Thermal Power Generation

摘　　要：研究了水蒸气分压、热解温度、热解恒温时间和气化温度对伊宁煤焦水蒸气气化反应的影响，并获得了相关动力学参数。结果表明：随着水蒸气分压的提高，煤焦气化活性提高，水蒸气分压大于0．045MPa时，煤焦表面活性位已经达到饱和；提高热解温度、延长恒温时间均会使煤焦气化活性降低，随着气化温度的升高，热解温度、恒温时间对煤焦气化活性的影响减小；气化温度是影响煤焦气化活性的主要因素，升高气化温度能明显提高煤焦气化活性；收缩核模型能够较好地描述伊宁煤水蒸气气化，由该模型求出的活化能范围为148．2～189．6kJ／mol。The effects of steam partial pressure, pyrolysis temperature, cokeforming time and gasi fication temperature on steam gasification of Yining coal char were studied, and a dynamic model was established for the gasification reaction. The results show that, the gasification reaction activ ity of char increases with the steam partial pressure （when the steam partial pressure is greater than 0. 045 MPa,the active sites on char have reached saturation） ,while rising the pyrolysis tem perature and prolonging the constant temperature time can both reduce the gasification reaction activity of char. With the increasing gasification temperature, the influence of pyrolysis tempera ture and cokeforming time on the steam gasification decreases. The gasification temperature is the main factor affecting the gasification activity of char. Rising the gasification temperature can enhance the gasification reactivity significantly. The activation energy obtained by the shrinking core model ranges from 148.2 kJ/mol to 189.6 kJ/mol,which can describe the steam gasification of Yining coal.

关 键 词：煤焦 水蒸气 气化 分压 热解温度 恒温时间 活化能 

分 类 号：TK16[动力工程及工程热物理—热能工程]