气化灰渣的理化性质及其对石油焦/CO_2气化反应特性的影响

Physicochemical Properties of Coal Gasification Slag and Its Catalytic Effect on Gasification Reactivity of Petroleum Coke

采用XRF、XRD和SEM/EDS等分析手段对神华煤气化灰渣的理化性质进行了表征,并考察了气化灰渣对金山石油焦/CO2气化反应活性的影响。结果表明：炉底灰渣和炉顶飞灰的灰分质量分数分别为78.39%和62.71%;炉底灰渣中Ca和Fe的质量分数较炉顶飞灰高,而炉顶飞灰中Si和Al的质量分数则比炉底灰渣高;气化灰渣中的矿物质主要以对气化反应无催化活性的惰性物质形态存在,炉底灰渣中对含碳物料气化反应有催化作用的主要是少量的硫酸钙、氧化铁和钾芒硝（K3Na（SO4）2）,而炉顶飞灰中则是少量的硫酸钙;随着气化灰渣添加量的增加,石油焦催化气化反应速率达到最大值时所对应的转化率逐渐减小。当气化灰渣的添加量为5%~30%时,石油焦的气化活性提高了2~7倍,其中炉底灰渣的催化活性稍优于炉顶飞灰。

The physicochemical properties of Shenhua coal gasification slag were characterized with the aids of XRF,XRD and SEM/EDS,and the catalytic effect of gasification slag on petroleum coke/CO2 gasification reactivity was also investigated.The results showed that the ash contents of bottom slag and fly ash were 78.39% and 62.71%,respectively.Bottom slag contained higher contents of Ca and Fe,but lower contents of Si and Al than those of fly ash.Inorganic matters in gasification slag mainly existed in the form of inert materials with no gasification reactivity.Calcium sulfate,iron oxide and glaserite（K3Na（SO4）2） in bottom slag were main catalytic components,while there was only low content of calcium sulfate in fly ash with catalytic effect.With increasing addition of slag,carbon conversion versus maximum gasification reactivity decreased.Catalytic gasification reactivity of petroleum coke with 5%-30% addition of gasification slag was raised 2-7 times as compared with non-catalytic one,and bottom slag had higher catalytic activity than fly ash.