Spout-Fluid Bed Technique
Spout-Fluid Bed Technique
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喷动流化床技术
DOI：
10.1021/i260034a032
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
A. Chatterjee
中科院分区：
文献类型：
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作者：
A. Chatterjee
喷动-流态化床是一种喷动和流态化同时发生的独特的流体-颗粒搅拌床。该技术克服了流态化床内分层或段塞、环空固体受限流动或喷动床内不稳定等固有限制。与其他任何流体-颗粒接触技术相比，喷动-床层技术提供了更高的固体和流体的循环和混合速度。它允许更大的流体流量范围，并很好地控制喷动或流态化。保持喷动或流态化的最小流体质量流量比整个床层只喷动或流态化时要低。在过去的25年里，流态化做了大量的工作，Mathur和Gishler(1955)在1955年左右开始了关于喷动的工作。尽管其惊人的物理行为可想而知，但它们在同一床上的同时联合作用至今仍未引起关注。所研究的喷动床是一种独特的流体-颗粒搅拌床，它克服了流体和喷动床的许多固有局限性。喷动流体床由一个圆柱形柱体组成，柱体底部为平底或圆锥体，底部有均匀分布的穿孔供流体进入，并起到网格的作用。格子的中心有一个较大的开口，连接到一条单独的管路(图1)，用于供应喷射液。塔的底部连接到流态化流体进入的镇静区。这类似于在已经沸腾的床中进行喷动，或者使已经喷动的床的环空流态化。在尝试大型装置之前，先在直径为50毫米的玻璃柱中进行初步观察，以空气为介质，喷出各种大小的沙子和煤。固定床的实验研究
The spout-fluid bed is a unique fluid-particle-agitated bed in which spouting and fluidizing occur simultaneously. This technique overcomes such inherent limita-tions as stratification or slugging in a fluidized bed and restricted flow ofannulus solids or instability in a spouted bed. The spout-fluid bed technique gives a much higher rate of circulation and mixing of solids andfluid than any other technique for fluid-particle contact. It allows a larger range of fluid flow rate and good control of spouting or fluidizing. The minimum fluid mass flow rate for maintaining spouting or fluidizing is lower than when theentire bed is only spouted or fluidized.^ great deal of work has been done on fluidization in the last 25 years, and work on spouting by Mathur and Gishler (1955) started around 1955. Their simultane-ous combined effect in the same bed has drawn no atten-tion so far, although its striking physical behavior can well be imagined.The spout-fluid bed underinvestigation is a unique fluid-particle-agitated bed which overcomes many inherent limitations of fluid and spouted beds. The spout-fluid bed consists of a cylindrical column with a flat or conical bottom with evenly distributed perforations for the fluid to enter, and functions as a grid. The center of the grid has a comparatively large opening, connected to a separate line (Figure 1) for the supply of spouting fluid. The bottom of the column is connected to the calming section through which the fluidizing fluid enters. This is similar to imparting spouting in an already fluidized bed or fluidizing the annulus of an already spouted bed. Before attempting a large setup, preliminary observations are taken in a 50-mm.-diameter glass column to spout-fluidize sand and coal of various sizes, using air as the medium. Experimentation with a constant bed