CIESC Journal ›› 2012, Vol. 63 ›› Issue (12): 3867-3874.DOI: 10.3969/j.issn.0438-1157.2012.12.019

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Characteristic of gas mixing in two-dimensional dual-leg fluidized bed

YANG Chunzhen, DUAN Yufeng, HU Haitao, MAO Yongqiu, ZHANG Pingping   

  1. Key Laboratory of Energy Thermal Conversion and Control, Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
  • Received:2012-05-09 Revised:2012-07-08 Online:2012-07-17 Published:2012-12-05
  • Supported by:

    supported by the National Key Technology R&D Program of China(2012BAA02B00).

二维双支腿流化床内气体混合特性

杨春振, 段钰锋, 胡海韬, 冒咏秋, 张平平   

  1. 能源热转换及其过程测控教育部重点实验室, 东南大学能源与环境学院, 江苏 南京 210096
  • 通讯作者: 段钰锋
  • 作者简介:杨春振(1984-),男,博士研究生。
  • 基金资助:

    国家科技支撑计划项目(2012BAA02B00)。

Abstract: Experiments of gas mixing between two half-beds were performed in a dual-leg circulating fluidized bed(DL-CFB)240 mm in width,40 mm in depth and 2000 mm in height by using glass beads with diameter of 0.25-0.28 mm as bed material.SO2 and CO as the gas tracers entering the left and right distributors separately were used to simulate the gas mixing between the two legs.MSD(mean square displacement)model was adopted to calculate the gas dispersion coefficient(Dw)which was used to investigate the effect of fluidization velocity and bed material inventory on gas mixing in the DL-CFB.The experimental results showed that Dw was about 50-300 cm2-1 at different fluidization velocities and bed material inventories.A higher fluidization velocity benefited particles exchange between two half-beds,which intensified the gas-solids interactions at the region with higher solids volume fraction.The gas mixing in the lower region of the DL-CFB was stronger than that in the upper region of the bed.A higher bed inventory was helpful to gas mixing at a lower fluidization velocity,while a higher fluidization velocity weakened gas mixing because of higher solids concentration in the center of the bed that prevented gas mixing.

Key words: dual leg, circulating fluidized bed, gas mixing, tracer gas

关键词: 双支腿, 循环流化床, 气体混合, 示踪气体

CLC Number: