机械活化煤气化细渣资源化利用及残碳燃烧反应动力学探究

Mechanical activation and combustion kinetics of residual carbon in coal-gasification fine slag

随着我国煤气化技术的快速发展,气化渣的产生和排放量逐年增加。煤气化细渣的大量堆存,给当地的环境保护造成了巨大的压力,已经成为限制煤化工产业基地可持续发展急需解决的重大问题。本文针对气化细渣中残碳反应活性低和转化难度大的问题,研究了机械活化法对气化渣残碳反应动力学的影响。采用Coats-Redfern法分析了机械活化对残碳反应活化能的作用规律。结果表明,机械活化8 h,残碳燃烧反应活性显著提高,650℃下的活化能由63.2 kJ·mol^(−1)降到28.4 kJ·mol^(−1)。不添加其他化学试剂,1000℃烧制高强度轻质陶粒,其堆积密度为0.867 g·cm^(−3),筒压强度为7.67 MPa。相关研究可以为我国气化细渣的资源化利用提供一定的数据和技术基础。

With the rapid development of coal gasification technology in China,a large amount of coal-gasification fine slag(CGFS)generated and discharged recently.The CGFS has increased pressure on the local environmental protection and limited the sustainable development of coal chemical industry bases,which is just becoming a problem that needs to be solved urgently.To improve the reaction activity of residual carbon in CGFS and increase its value in resource recycling,this paper studied the influence of mechanical activation on the combustion kinetics of residual carbon.The Coats-Redfern method was used to analyze the effect of mechanical activation on the activation energy of residual carbon combustion reaction.The results showed that the combustion reaction activity of residual carbon in CGFS significantly increases after 8 hours of mechanical activation,and the activation energy decrease from 63.2 to 28.4 kJ·mol^(−1)at 650℃.Without other chemical reagents,high-strength lightweight ceramsite was prepared at 1000℃,with a bulk density of 0.867 g·cm^(−3)and a cylinder compressive strength of 7.67 MPa.This paper can provide valuable data and a technical route for the utilization of CGFS in China.