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首页> 外文期刊>International Journal of Multiphase Flow >Flow characteristic studies on the gas-liquid-solid circulating fluidized bed based on system stability
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Flow characteristic studies on the gas-liquid-solid circulating fluidized bed based on system stability

机译：基于系统稳定性的气液固 - 固体循环流化床的流动特性研究

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Gas-liquid-solid circulating fluidized bed (GLSCFB) is considered as superior technology over conventional Gas-liquid-solid fluidized beds. The GLSCFB consist of two interconnected riser and downer columns facilitating solid circulation between the columns by pressure balance. The overall pressure balance is an important parameter for stable operation of the system. The present communication reports an experimental investigation to correlate the pressure balance and hydrodynamics behavior and the stability of the GLSCFB. In this regard, two spherical shape glass bead particles (500 and 1200 mu m in size), two irregular shape lava rock particles (500 and 920 mu m in size) are used as solid phase, air as gas phase and saline-water as liquid phase. For flow characterization, superficial solids velocity (U-s), normalized superficial solids velocity (U-s/U-l), solids holdup (epsilon(s)) and gas holdups (epsilon(g)) are considered as measureable parameters. The experimental observations indicates that the solids holdup have significant impact of size, density and shape of the particles on hydrodynamics behavior. The drag effect on the particles and their terminal settling velocity are the main factors on solids holdup distribution. The average solids holdups decrease with the increase on net superficial liquid velocity (U-l - U-t) and normalized superficial liquid velocity (U-l/U-t). Effects of different parameters (U-a, U-l, U-g, U-l/U-t, U-l - U-t) are considered to study the hydrodynamics behavior on superficial solids velocity, solids and gas holdups. Two operating regimes are found under different operating conditions. In Region-I, superficial solids velocity increases with the increases of superficial, net superficial and normalized superficial liquid velocity whereas in Region-II solids velocities remain constant. For the case of cross-sectional phase holdups, both gas and solids holdups decrease with the increases of superficial liquid velocity. (C) 2018 Elsevier
机译：在传统的气体 - 液体固体流化床上被认为是燃气液固 - 固体循环流化床（GLSCFB）的优异技术。 GLSCFB由两个互连的立管和俯卧柱组成，促进柱之间的固体循环通过压力平衡。整体压力平衡是系统稳定运行的重要参数。本通讯报告了一种实验研究，以将压力平衡和流体动力学行为以及GLSCFB的稳定性相关。在这方面，两个球形形状玻璃珠粒（500和1200μm尺寸），两个不规则形状的熔岩岩颗粒（500和920μm的尺寸）用作固相，空气作为气相和盐水作为液相。对于流动表征，浅表固体速度（U-S），归一化表面固体速度（U-S / U-L），固体保持（epsilon（epsilon）和气体储存（epsilon（g））被认为是可测量的参数。实验观察表明，固体持有的尺寸对水动力学行为上的颗粒尺寸，密度和形状具有显着影响。对颗粒的拖动效应及其端子沉降速度是固体持有分布的主要因素。随着净浅表液体速度（U-L - U-T）和归一化浅表液体速度（U-L / U-T）的增加，平均固体保持降低。不同参数（U-A，U-L，U-G，U-L / U-T，U-L - U-T）的效果被认为是在浅表固体速度，固体和气体堆叠上研究流体动力学行为。在不同的操作条件下发现了两种操作制度。在区域-I中，浅表固体速度随着浅表，浅表性和归一化浅表液体速度的增加而增加，而在区域-II中固体速度保持恒定。对于横截面相位堆积的情况，随着浅表液体速度的增加，气体和固体储存减少。 （c）2018 Elsevier

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