• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Investigation on a gas-solid fluidized bed hydrodynamics using a non-intrusive technology to visualize flow field.
【24h】

Investigation on a gas-solid fluidized bed hydrodynamics using a non-intrusive technology to visualize flow field.

机译：使用非侵入性技术可视化流场的气固流化床流体动力学研究。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The biggest challenge for 21st century is to fulfill global energy demand and at the same time reduce detrimental impact on environment. Gasification technology can meet the requirement and also reduce emission without compromising its performance. In coal gasification, instead of burning coal completely a partial combustion takes place with presence of steam and limited amount of oxygen. In this controlled environment a chemical reaction takes place and produces a mixture of clean synthetic gas. Gas-solid fluidized bed is one type of gasification technology. During gasification mixing behavior of solid (coal) and gas and their flow pattern very complicated to understand. Many attempts have taken in laboratory scale to understand bed hydrodynamics with spherical particle whereas in actual coal are non-spherical. Considering this issue an attempt has taken to investigate fluidized bed behavior using different ranges non-spherical particles and spherical particle as well. Different parameters are controlled during investigation like particle size, bed height, bed diameter and particle shape. Particles used from 355 microm to 1180 microm, bed diameter varied from 2 cm to 7 cm, two fluidized bed with diameter 3.4 cm and 12.4 cm, spherical and non-spherical shape particles were taken into consideration for investigation. Pressure drop was measured with increasing superficial gas velocity. The velocity required to start fluidize the particle is called minimum fluidization velocity. Minimum fluidization velocity is one of the most important parameter to design and optimize gas-solid fluidized bed performance. This minimum fluidization velocity was monitored during investigation with changing factors that affect this velocity. From investigation it has been found that minimum fluidization velocity is independent on bed height for both spherical and non-spherical particles, it decrease with decreasing particle size and it also decrease with decreasing bed diameter. Shadow sizing a non-intrusive technology is also used to visualize flow field inside fluidized bed in dilute section for both spherical and non-spherical particles and also detect the particle size.
机译：21世纪最大的挑战是满足全球能源需求，同时减少对环境的不利影响。气化技术既可以满足要求，又可以减少排放，而不会影响其性能。在煤气化中，代替完全燃烧煤炭，在蒸汽和有限量的氧气存在下发生部分燃烧。在这种受控的环境中，会发生化学反应并产生干净的合成气混合物。气固流化床是一种气化技术。在气化过程中，固体（煤）和气体的混合行为及其流态非常难以理解。在实验室规模上已经进行了许多尝试来理解球形颗粒的床层流体动力学，而在实际的煤中却是非球形的。考虑到该问题，已经尝试使用不同范围的非球形颗粒以及球形颗粒来研究流化床行为。在研究过程中控制不同的参数，例如粒径，床高，床直径和颗粒形状。研究使用了从355微米到1180微米，床直径从2厘米到7厘米不等，两个直径分别为3.4厘米和12.4厘米的流化床，球形和非球形颗粒的颗粒。随着表观气体速度的增加来测量压降。开始流化颗粒所需的速度称为最小流化速度。最小流化速度是设计和优化气固流化床性能的最重要参数之一。在研究过程中通过影响该速度的变化因素来监控该最小流化速度。从研究中发现，对于球形和非球形颗粒，最小流化速度均与床高度无关，随着颗粒尺寸的减小而减小，并且随着床直径的减小而减小。阴影调整大小非侵入式技术还用于可视化流化床内稀释部分中球形和非球形颗粒的流场，并检测粒径。

著录项

  • 作者

    Sarker, Md. Rashedul Hasan.;

  • 作者单位

    The University of Texas at El Paso.;

  • 授予单位 The University of Texas at El Paso.;
  • 学科 Engineering Mechanical.
  • 学位 M.S.
  • 年度 2012
  • 页码 85 p.
  • 总页数 85
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 语言学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号