摘要
为了研究水平回转干馏炉内双组元颗粒的混合效果,采用离散单元法研究回转干馏炉抄板形式和干馏炉壁面周向线速度对双组元颗粒间混合程度的影响,并引入不同颗粒间接触数来衡量颗粒间的混合程度,以颗粒接触数动态跟踪颗粒间的混合程度。研究结果表明:当干馏炉内未设抄板时,大小颗粒发生分离,混合效果不好;干馏炉内设抄板时,抄板在周期性地"抄起–卸出"物料的过程中破坏原有颗粒间分离的机制,从而改善多组元颗粒混合效果。抄板形式和干馏炉壁面周向线速度在不同程度上影响颗粒间的混合,相同周向线速度下,干馏炉内设弯抄板时混合较优;周向线速度对混合的影响与抄板形式有关。对于设抄板的干馏炉内颗粒混合,需要综合考虑线速度和抄板形式来实现干馏炉内较优混合。
In order to study the mixing effect of two component particles in the rotary retorting, the discrete element method was employed to explore the impact of flights forms and linear speed of rotary retorting on particle mixing in rotary retorting. By introducing number of contacts to track the progress of mixing and taking number of contacts between different particles as mixing index, the degree of mixing was analyzed. The results show that the moon pattern appears in which the small particles concentrate in a central core and the large particles distribute in the periphery; the mixing is inadequate when rotary retorting without flights installed compare with that of rotary retorting with different forms of flights equipped; this is due to that the flights destroyed segregation in ＂lifting and castrating＂ particles periodically which causes the demixing of particles. The flights form and the linear speed of rotary retorting have influence on particle mixing inordinately, the mixing is optimum when the 120~angled flights installed under the same linear speed of rotary retorting, the degree of mixing influenced by linear speed is correlate to flights forms. Therefore, it is essential to consider the linear speed and flights forms comprehensively inorder to achieve better mixing in rotary retorting.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2012年第11期72-78,148,共7页
Proceedings of the CSEE
基金
国家潜在油气资源(油页岩勘探开发利用)产学研用合作创新研究项目
吉林省重大科技发展计划项目(20096034)
东北电力大学博士科研启动基金项目(BSJXM2011-02)~~
关键词
离散单元法
回转干馏炉
混合
接触数
discrete element method （DEM）
rotaryretorting
mixing
number of contacts
