黑液焦CO_2气化及动力学研究  

Research on black liquor char CO_2 gasification and kinetics

作　　者：李许生[1] 卫威[2] 农光再[2] 覃程荣[2] 王双飞[2] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西大学轻工与食品工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2015年第6期1577-1587,共11页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(31200459);广西自然科学基金创新研究团队项目(2013GXNSFFA019005)

摘　　要：为了掌握甘蔗渣黑液焦CO_2气化特性和动力学数据,开展甘蔗渣黑液焦CO_2气化研究。通过改变温度、[CO]和[CO_2]研究其对黑液焦转化的影响。采用试验数据与兰格缪尔-修斯伍德吸附动力学方程拟合的方法求解动力学方程参数。研究表明,在升高气化温度和增加[CO_2]时可以加速气化反应,而在增加[CO]时则会抑制气化反应的发生;表观气化速率的倒数分别与[CO]和[CO_2]^(-1)成线性关系,但与[CO]/[CO_2]的比值不成线性关系;在研究的操作条件范围内甘蔗渣黑液焦CO_2气化过程可以采用兰格缪尔-修斯伍德吸附非催化动力学方程描述,平均活化能为153.5 k J/mol。研究数据表明活性点位数可作为M/C摩尔比值的函数而不是常数。引入M/C摩尔比值对动力学模型修正后,获得的气化反应常数、CO吸附常数和CO_2吸附常数均可视为恒定值,其值分别为0.158 9 m^3/(mol·min)、-1.048 7 m^3/mol和-0.323 8 m^3/mol。To get the bagasse black liquor char CO2 gasification characteristics and kenetic data,the bagasse black liquor char CO2 gasification was studied. The effects on black liquor char gasification transformation was researched by changing the temperature,[CO],and [CO2]. It was used to solve kinetics equation parameters by fitting on the experimental data with Langmuir-Hinshelwood kinetic equation. The results showed that the gasification rate increases when the gasification temperature and [CO2]increase,and the gasification rate decreases when [CO]increase. The reciprocal of apparent gasification rate was linearly related to [CO]and [CO2]- 1respectively. But it was not linear with the ratio of [CO]/[CO2]. The process of the bagasse black liquor char CO2 gasification may be described by a Langmuir-Hinshelwood non-catalyzed kinetic equation for a specific range of operating conditions,and the average activation energy of the bagasse black liquor char CO2 gasification is 153. 5 k J / mol. The data obtained suggested that this operational range could be broader if thenumber of active sites is considered as a function of M / C rather than as constant. By introducing the factors of M / C mole ratio on the kinetics revised model,the gasification reaction constant,carbon monoxide adsorption constant and carbon dioxide absorption constant can be regarded as a constant value,which were 0. 158 9 m3/（ mol·min）,- 1. 048 7 m3/ mol and- 0. 323 8 m3/ mol,respectively.

关 键 词：黑液焦 CO2 气化 动力学 

分 类 号：TS713[轻工技术与工程—制浆造纸工程]