石油焦的气化反应特性

Gasification Reactivity of Petroleum Coke with Steam and Carbon Dioxide

针对3种不同的石油焦,在热天平上考察了不同的化学反应条件,包括温度、压力和气氛等因素对气化反应的影响.研究结果发现,在水蒸气气氛下石油焦具有良好的气化反应活性,而在二氧化碳气氛下石油焦气化反应进行得相当缓慢,相同条件下的C H2O反应速率是C CO2反应速率的十几倍.在60%水蒸气的实验温度条件下,每升高50℃,平均气化反应速率提高1倍;1000℃时,水蒸气分压对平均气化反应速率的影响不均匀,分压增加,影响减小.随着反应的不断进行,气化反应速率存在最大值,而出现最大值时的转化率不受反应温度和压力的影响,而与气化介质有关.根据实验结果,分析得到了3种石油焦在水蒸气条件下反应速率与温度、水蒸气分压和转化率的关系式,并得到了3种石油焦气化反应的活化能.

Gasification reactivity of three petroleum cokes from different plants was investigated using thermobalance and the effects of agent, temperature and steam partial pressure to gasification were studied. The experimental results show that petroleum coke has good gasification reactivity with steam, but poor with carbon dioxide. And at the same experimental condition, the reaction rate of C-H2O is more than ten times higher than that of C-CO2. With 60% steam, the increase of the average reaction rate is linear to temperature, 1 time per 50°C. At 1000°C, the effect of steam partial pressure on the average reaction rate is not well-proportioned. The reaction rate shows a maximum value at some carbon conversion, which is affected by agent instead of by temperature and steam partial pressure. And the instantaneous reactivity grows continuously during the gasification of petroleum coke. Based on experimental data, a correlation equation for reaction rate to temperature, steam partial pressure and carbon conversion in steam was derived.