新型循环流化床反应器研究进展

发布时间：2018-06-29 23:22

本文选题：循环流化床 + 反应器　；参考：《化工进展》2017年09期

【摘要】：开发新型循环流化床反应器始终是流态化领域研究的热点。本文首先简介了循环流态化的基本原理以及床层内部流体动力学特性,然后从装置构型、操作工况、流动特性以及应用前景等方面综述了近年来新型循环流化床反应器技术的研究进展,并对其进行了系统分类:高密度循环流化床和循环湍动流化床在实现提升管增浓的基础上,极大地改善了流化床体系中明显的不均匀时空流动结构,但是各有弊端,例如高密度循环流化床(HDCFB)中颗粒沿径向混合有很大的梯度,循环湍动流化床(CTFB)中存在强烈的轴向返混以及颗粒停留时间较长,且两者整体偏低的颗粒浓度进一步限制了其在两段提升管催化裂解多产丙烯(TMP)等生产低碳烯烃工艺的应用;变径提升管反应器、内循环型提升管反应器以及多流型提升管反应器等新型反应器将提升管高效的气力输送特性与密相床内较高的颗粒浓度、高效的热质传递等优点相互耦合,在提升管内既能实现高密度输送又能形成均匀的流动结构,消除反应环境对产品分布的影响。最后指出,新型循环流化床的研究应从改善流动结构、发展优化组合技术以及建立统一流动模型3个方面着手。
[Abstract]:Developing a new circulating fluidized bed reactor has always been a hot topic in fluidization field. This paper first introduces the basic principle of circulating fluidization and the characteristics of fluid dynamics inside the bed, then from the configuration of the device, operating conditions, The research progress of new circulating fluidized bed reactor (CFB) technology in recent years is reviewed in the aspects of flow characteristics and application prospect, and it is systematically classified: high density circulating fluidized bed and circulating turbulent fluidized bed are based on the enhancement of riser. The obvious inhomogeneous space-time flow structure in fluidized bed system is greatly improved, but each has its own drawbacks. For example, the particles in high density circulating fluidized bed (HDCFB) have a large gradient along the radial mixing. In circulating turbulent fluidized bed (CTFB), there is strong axial backmixing and long particle residence time, and the lower particle concentration further limits its application in the two-stage riser catalytic cracking of propene (TMP) to produce low olefins. New types of reactors, such as variable diameter riser reactor, internal circulation riser reactor and multi-flow riser reactor, are coupled with the advantages of high particle concentration and high heat and mass transfer in dense phase bed. The high density transportation and uniform flow structure can be realized in the riser and the influence of reaction environment on product distribution can be eliminated. Finally, it is pointed out that the research of new circulating fluidized bed should start from three aspects: improving the flow structure, developing the optimal combination technology and establishing a unified flow model.
【作者单位】：中国石油大学(华东)重质油国家重点实验室;
【分类号】：TQ051.13

【相似文献】