碱金属K对铁焦与CO_2气化反应的影响  

Influence of alkali metal K on the gasification reaction of ferro-coke with CO_2

作　　者：毕学工[1] 刘威[1] 王亚雨 周进东[1] 史世庄[2] Bi Xuegong Liu Wei Wang Yayu Zhou Jindong Shi Shizhuang(Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China Hubei Coal Conversion and New Carbon Materials Key Laboratory, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [2]武汉科技大学煤转化及新型炭材料湖北省重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2017年第3期197-203,共7页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51174149)

摘　　要：将铁焦置于K_2CO_3水溶液中煮沸,通过调节煮沸时间获得不同增碱量的试样。采用热重天平和气体分析仪研究铁焦在增碱处理前后几个不同温度下与CO_2气化反应时的失重和废气成分变化情况,确定了铁焦的气化开始温度,并基于未反应核模型进行铁焦的气化反应动力学分析。结果表明,碱金属K使铁焦气化开始温度明显降低;碱金属K对铁焦的气化反应有促进作用,降低了化学反应活化能和内扩散活化能,这种正催化作用在低温下比高温下更明显;铁焦气化反应在开始阶段主要受界面化学反应的控制,随后逐渐变为内扩散和界面化学反应的混合控制。The alkali content of ferro-cokes was changed by boiling coke in K2CO3 solution for different lengths of time. Thermo-gravimetric balance and gas analyzer were applied to study the ferro-coke＇s weight loss and the variation in exhaust gas composition during the gasification reaction of ferro-coke with CO2 at different temperatures. Gasification starting temperatures of the ferro-cokes were confirmed. Then the gasification reaction kinetics was analyzed based on unreacted core model. The results show that alkaline metal K obviously reduces the gasification starting temperature of ferro-coke. It also accelerates the gasification reaction and decreases the activation energies of chemical reaction and internal diffusion, and this positive catalytic effect is more significant at lower temperature than at higher one.Ferro-coke gasification is controlled mainly by interface chemical reaction in the starting phase and gradually by a combination of internal diffusion and interface chemical reaction with the progress of reaction.

关 键 词：铁焦 钾 CO2气化 气化反应性 气化温度 未反应核模型 

分 类 号：TF526.1[冶金工程—钢铁冶金]