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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第1期    总第257期    2016年1月

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文章编号:1672-7207(2016)01-0279-07
流化床内生物质石英砂混合流动压力脉动频谱特性
王肖祎,仲兆平,王泽宇,赵凯

(东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室,江苏南京,210096)

摘 要: 为考察生物质颗粒的添加对流化床流动特性的影响,研究不同静止床高和生物质添加量下矩形流化床的压力脉动频谱特性,床料选用0.8mm粒径的石英砂,柱形生物质颗粒直径×长为10mm×10mm。研究结果表明:当不添加生物质颗粒时,高静止床高下压力脉动信号的功率谱密度图在0~5Hz区间会出现主频。当处于低静止床高且生物质添加量较少时,功率谱密度图主频完全消失;当生物质添加量较多时则会出现1个明显的主频,该主频随气速的增大而增大。当处于高静止床高时,只有在低气速下,生物质添加才会对压力脉动频谱特性有明显影响。

 

关键词: 流化床;生物质颗粒;混合流动;压力脉动;功率谱密度

Frequency spectrum characteristics of pressure fluctuation in fluidized bedwith biomass particles and quartz sands
WANG Xiaoyi, ZHONG Zhaoping, WANG Zeyu, ZHAO Kai

Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education,
School of Energy and Environment, Southeast University, Nanjing 210096, China

Abstract:To research the influences of fluid characters on fluidized bed added biomass particles, the pressure fluctuation spectrum behaviors at different static bed heights and biomass weight were investigated in a rectangular fluidized bed. The quartz sands with the diameter of 0.8mm and cylinder-shaped biomass particles with both of the diameter and length of 10mm were adopted as bed materials. The results show that power spectral density has an obviously main frequency between 0-5Hz when the static bed height is high and without biomass particles. The main frequency of the power spectral density disappears completely, when the static bed height is low and a small amount of biomass is added. But an obvious main frequency occurs when a large amount of biomass is added. When the static bed height is high, the biomass particles influence the flow of gas only at a low superficial gas velocity.

 

Key words: fluidized bed; biomass particles; mixed flow; pressure fluctuation; power spectral density

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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