腐植酸型煤气化特性及动力学研究

以低活性福建无烟粉煤为原料,采用腐植酸型煤黏结剂,制得腐植酸型煤。比较研究型煤和无烟煤在常压条件下的气化动力学和气化特性。运用等温热重法,在900~1 150℃进行水蒸气气化实验,测定了型煤和无烟煤的反应速率、转化率与时间的关系,考察了常压下温度和煤样对气化反应的影响。采用积分缩核模型对实验数据进行拟合关联,得到煤样水蒸气气化反应的动力学参数。结果表明,型煤的气化反应活化能(102.0 kJ/mol)低于福建无烟煤(122.5 kJ/mol)。950℃下型煤的化学反应性(80.0%)优于福建无烟煤(33.0%)。型煤较福建无烟煤表现出更好的化学反应性,可代替优质块煤用于工业固定床煤气化。

Gasification characteristics and kinetics of briquette using humic acid binder

Briquette was made from a low active pulverized Fujian anthracite with humic acid as binder. The gasification reaction kinetics and characteristics of briquette were compared with those of Fujian anthracite. The steam gasification rate was determined at the temperature of 900~1 150℃ and atmospheric pressure by using the isothermal thermogravimetry. The kinetic parameters of gasification were calculated based on the shrinking-core model (SCM). The data show that the activation energy of briquette is 102.0 kJ/mol, lower than that of Fujian anthracite(122.5 kJ/mol). The carboxyreactivity of briquette is 80.0% at 950℃, while it is only 33.0% for Fujian anthracite granule. The results exhibit that the briquette has a higher gasification reactivity than Fujian anthracite lump, and could be a substitute of high quality lump coal for the industrial fixed bed gasification.