摘要
常压,1200℃～1500℃,在自制管式反应器中,以二氧化碳为气化介质,研究了石油焦以及石油焦与后布连煤焦掺混后形成的混合焦的气化反应性,借助于XRD分析了高温处理后石油焦与煤焦在碳结构有序化方面的区别.研究结果表明,当碳转化率高于0.7,气化超过1300℃,石油焦的反应速率出现急骤下降,气化温度越高,相应石油焦速率下降越快.混合焦气化反应性既不同于纯石油焦也不同于纯煤焦.随石油焦掺入比变化而改变的拐点主要源于石油焦与煤焦的反应性之间差异.较高转化率下出现的拐点,主要源于石油焦本身随气化温度提高导致气化速率下降.XRD测定显示,高温处理后石油焦中碳有序化程度要明显高于煤焦.高气化温度下石油焦碳结构发生明显有序化是导致其反应活性急剧下降的重要原因.
Using CO2 as the gasification agent, the gasification reactivity of the petroleum coke and the mixtures with Houbulian coal chars was studied in a self-made tubular reactor under normal pressure and at temperature ranging from 1 200 ℃ to 1 500 ℃. The difference of carbon structure ordering between petroleum coke and coal char processed at high temperature was analyzed by using XRD. The results show that the gasification rate of petroleum coke decreases rapidly when the carbon conversion rate is higher than 70% and the gasification temperature is over 1 300 ℃. The higher the gasification temperature is, the faster the gasification rate of petroleum coke declines. The gasification reactivity of the mixture of petroleum and coal char is different from that of pure petroleum coke or pure coal char. With the variation of the ratio of petroleum coke to coal char, the inflexion varies because of the different reactivity between petroleum coke and coal char. With the increase of gasification temperature, the decrease of gasification rate of the petroleum coke results in the appearing of inflexion at higher carbon conversion. The XRD test indicates that after being handled at high temperature, the degree of carbon structure ordering in petroleum coke is greater than that in coal char. The carbon structure ordering obviously at high temperature is an important reason to lead to the sharp reduction of petroleum coke gasification rate.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2005年第6期687-691,共5页
Journal of Fuel Chemistry and Technology
关键词
石油焦
高温气化
XRD
碳结构
petroleum coke
high temperature reactivity
XRD
carbon structure
