One Dimensional Numerical Simulation Of Small Scale Cfb Combustors

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作   者：

Afsin Gungor; 

作者机构：

51100 Nigde;  Department of Mechanical Engineering;  Turkey;  Faculty of Engineering and Architecture;  Nigde University; 

关键词：

numerical analysis;  circulating fluidized bed;  SIMULATION;  modelling; 

期刊名称：

Energy conversion & management

i s s n：

0196-8904

年卷期：

2009 年 50 卷 3 期

页   码：

711-722

页   码：

摘   要：

In this study, a one-dimensional model which includes volatilization, attrition and combustion of char particles for a circulating fluidized bed (CFB) combustor has been developed. In the modeling, the CFB combustor is analyzed in two regions: bottom zone considering as a bubbling fluidized bed in turbulent fluidization regime and upper zone core-annulus solids flow structure is established. In the bottom zone, a single-phase back-flow cell model is used to represent the solid mixing. Solids exchange, between the bubble phase and emulsion phase is a function of the bubble diameter and varies along the axis of the combustor. In the upper zone, particles move upward in the core and downward in the annulus. Thickness of the annulus varies according to the combustor height. Using the developed simulation program, the effects of operational parameters which are the particle diameter, superficial velocity and air-to-fuel ratio on net solids flux, oxygen and carbon dioxide mole ratios along the bed height and carbon content and bed temperature on the top of the riser are investigated. Simulation results are compared with test results obtained from the 50 kW Gazi University Heat Power Laboratory pilot scale unit and good agreement is observed.