Effect of bed geometry on operating pressure drop and minimum fluidizing velocity in a draft tube spout‐fluid bed

2019 ◽  
Vol 97 (8) ◽  
pp. 2318-2325
Author(s):  
Tingting Zhang ◽  
Guoqiang Huang ◽  
Guoliang Su ◽  
Shuaifeng Liu ◽  
Yeming Zhou
Keyword(s):  
Pressure Drop ◽  
Draft Tube ◽  
Operating Pressure ◽  
Fluid Bed ◽  
Minimum Fluidizing Velocity

Solids Circulation Flux and Gas Bypassing in a Pressurized Spout-fluid Bed with a Draft Tube

2008 ◽  
Vol 80 (5) ◽  
pp. 800-808 ◽  
Author(s):  
Rui Xiao ◽  
Mingyao Zhang ◽  
Baosheng Jin ◽  
Xiangdong Liu
Keyword(s):  
Draft Tube ◽  
Fluid Bed

Encapsulation of Orange Essential Oil in a Spout-Fluid Bed Dryer with a Draft Tube on a Bed of Inert Solids

2014 ◽  
Vol 32 (14) ◽  
pp. 1718-1726 ◽  
Author(s):  
Claudia Velázquez-Contreras ◽  
Guillermo Osorio-Revilla ◽  
Tzayhri Gallardo-Velázquez
Keyword(s):  
Essential Oil ◽  
Draft Tube ◽  
Fluid Bed ◽  
Orange Essential Oil

Genetic Algorithm Optimization for Primary Surfaces Recuperator of Microturbine

2006 ◽  
Vol 129 (2) ◽  
pp. 436-442 ◽  
Author(s):  
Wang Qiuwang ◽  
Liang Hongxia ◽  
Xie Gongnan ◽  
Zeng Min ◽  
Luo Laiqin ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Pressure Drop ◽  
Total Pressure ◽  
Superior Performance ◽  
Operating Pressure ◽  
Minimum Volume ◽  
Original Design ◽  
Design Data ◽  
Total Pressure Drop ◽  
Geometry Characteristic

In recent years, the genetic algorithm (GA) technique has gotten much attention in solving real-world problems. This technique has a strong ability for global searching and optimization based on various objectives for their optimal parameters. The technique may be applied to complicated heat exchangers and is particularly useful for new types. It is important to optimize the heat exchanger, for minimum volume/weight, to save fabrication cost or for improved effectiveness to save energy consumption, under the requirement of allowable pressure drop; simultaneously it is mandatory to optimize geometry parameters of heating plate from technical and economic standpoints. In this paper, GA is used to optimize the cross wavy primary surface (CWPS) and cross corrugated primary surface (CCPS) geometry characteristic of recuperator in a 100kW microturbine, in order to get more compactness and minimum volume and weight. Two kinds of fitness assignment methods are considered. Furthermore, GA parameters are set optimally to yield smoother and faster fitness convergence. The comparison shows the superiority of GA and confirms its potential to solve the objective problem. When the rectangular recuperator core size and corrugated geometries are evaluated, in the CWPS the weight of the recuperator decreases by 12% or more; the coefficient of compactness increases by up to 19%, with an increase of total pressure drop by 0.84% compared to the original design data; and the total pressure drop versus the operating pressure is controlled to be less than 3%. In the CCPS area compactness is increased to 70% of the initial data by decreasing pitch and relatively high height of the passage, the weight decreases by 17–36%, depending on the inclination angle (θ). Comparatively the CCPS shows superior performance for use in compact recuperators in the future. The GA technique chooses from a variety of geometry characters, optimizes them and picks out the one which provides the closest fit to the recuperator for microturbine.

Study on the flow behavior in spout-fluid bed with a draft tube of sub-millimeter grade silicon particles

2014 ◽  
Vol 237 ◽  
pp. 277-285 ◽  
Author(s):  
Guoliang Su ◽  
Guoqiang Huang ◽  
Ming Li ◽  
Chunjiang Liu
Keyword(s):  
Draft Tube ◽  
Flow Behavior ◽  
Fluid Bed ◽  
Grade Silicon ◽  
Silicon Particles

scholarly journals Hydrodynamic experiments on a small-scale circulating fluidized bed reactor at elevated operating pressure, and under an O2/CO2 environment

2017 ◽  
Vol 21 (2) ◽  
pp. 1093-1104 ◽  
Author(s):  
Yerbol Sarbassov ◽  
Azd Zayoud ◽  
Pinakeswar Mahanta ◽  
Sai Gu ◽  
Panneerselvam Ranganathan ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Fluidized Bed ◽  
Atmospheric Pressure ◽  
Circulating Fluidized Bed ◽  
Elevated Pressure ◽  
Small Scale ◽  
Operating Pressure ◽  
Hydrodynamic Parameters ◽  
Hydrodynamic Experiments ◽  
Promising Development

Pressurized circulating fluidized bed technology is a potentially promising development for clean coal technologies. The current work explores the hydrodynamics of a small-scale circulating fluidized bed at elevated operating pressures ranging from 0.10 to 0.25 MPa. The initial experiments were performed at atmospheric pressure with air and O2/CO2 environments as the fluidization gas to simulate the hydrodynamics in a circulating fluidized bed. A comparison between the effects of air and O2/CO2 mixtures on the hydrodynamics was outlined in this paper for particles of 160 ?m diameter. A small but distinct effect on axial void-age was observed due to the change in gas density in the dense zone of the bed at lower gas velocity, while only minimal differences were noticed at higher gas velocities. The hydrodynamic parameters such as pressure drop and axial voidage profile along the height were reported at two different bed inventories (0.5 and 0.75 kg) for three mean particle sizes of 160, 302, and 427 ?m and three superficial gas velocities. It was observed that the operating pressure had a significant effect on the hydrodynamic parameters of bed pressure drop and axial bed void-age profiles. The effect of solids loading resulted in an exponential change in pressure drop profile at atmospheric pressure as well as at elevated pressure. The experimental results on hydrodynamic parameters are in reasonable agreement with published observations in the literature.

Numerical Investigation of Subcooled Boiling Heat Transfer in Helically-Coiled Tube

2020 ◽  
Vol 17 (1) ◽  
pp. 7675-7686
Author(s):  
Luthfi A. F. Haryoko ◽  
Jundika C. Kurnia ◽  
Agus P. Sasmito
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Coefficient ◽  
Pressure Drop ◽  
Mass Flux ◽  
Boiling Heat Transfer ◽  
Operating Pressure ◽  
Subcooled Boiling ◽  
Coiled Tube ◽  
Helically Coiled Tube

Subcooled boiling heat transfer in helically-coiled tubes offers better heat transfer performance than any other types of boiling processes due to its ability to capture high heat flux with a relatively low wall superheat. This study investigates turbulent subcooled forced convection boiling performances of water-vapour in a helically-coiled tube with various operating conditions i.e. operating pressure, heat, and mass flux. Developed CFD model is validated against previously published experimental results using the RPI model. The model is developed based on the Eulerian-Eulerian framework coupled with k-ε RNG turbulence model and Standard Wall-Function. A good agreement is found between numerical prediction and experimental counterpart for the bulk fluid temperature and non-dimensional length. The result indicates that the subcooled boiling heat transfer in a helically-coiled tube tends to improve heat transfer coefficient and pressure drop in the domain. Subcooled boiling starts at the inner side of the helically-coiled tube (f=9900) due to the existence of secondary flow that comes from the coil curvature. Heat transfer coefficient and pressure drop increased with increasing heat flux and decreasing mass flux, and operating pressure. This is caused by the bubble movement and convective heat transfer phenomena in a helically-coiled tube. Finally, this study can provide a guideline for future research of the subcooled boiling in a helically-coiled tube.

Study on the flow behavior of irregular plastic particles in a spout-fluid bed with a draft tube

2017 ◽  
Vol 36 (8) ◽  
pp. 945-954 ◽  
Author(s):  
Man Wu ◽  
Qingjie Guo ◽  
Meijie Zhao ◽  
Yizhong Chen
Keyword(s):  
Draft Tube ◽  
Flow Behavior ◽  
Fluid Bed
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