化工学报 ›› 2013, Vol. 64 ›› Issue (5): 1592-1600.DOI: 10.3969/j.issn.0438-1157.2013.05.013

• 流体力学与传递现象 • 上一篇    下一篇

海藻生物质颗粒流化床燃烧试验研究

王爽1, 姜秀民2, 王谦1, 吉恒松1   

  1. 1. 江苏大学能源与动力工程学院, 江苏 镇江 212013;
    2. 上海交通大学热能工程研究所, 上海 200240
  • 收稿日期:2012-05-04 修回日期:2013-01-31 出版日期:2013-05-05 发布日期:2013-05-05
  • 通讯作者: 王爽
  • 作者简介:王爽(1983-),男,博士,讲师。
  • 基金资助:

    江苏省高校自然科学研究面上项目(12KJB480004);江苏大学高级专业人才科研启动基金项目(12JDG035)。

Fluidized bed combustion of seaweed biomass particles

WANG Shuang1, JIANG Xiumin2, WANG Qian1, JI Hengsong1   

  1. 1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
    2. Institute of Thermal Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2012-05-04 Revised:2013-01-31 Online:2013-05-05 Published:2013-05-05
  • Supported by:

    supported by the Natural Science Fundamental Research Project of Jiangsu Colleges and Universities in China(12KJB480004)and the Science and Technology Start-up Foundation for Advance Talents of Jiangsu University in China(12JDG035).

摘要: 在小型流化床试验台上研究了海藻颗粒(条浒苔与马尾藻)的流化床燃烧。海藻在流化床内的挥发分析出燃烧时间都在1 min左右。条浒苔颗粒在流化床中燃烧先进行脱水和挥发分的燃烧,接着发生焦炭燃烧,其燃烧过程符合缩核模型,炭核由外向内逐层燃烧,而灰层半径几乎不变。但马尾藻颗粒由于挥发分的大量快速释放而迅速膨胀破碎成屑。另外通过对条浒苔颗粒及不同燃烧时间后收集的焦炭颗粒剖面的SEM扫描电镜观察,发现随着燃烧的进行,颗粒内孔隙增大,微孔表面粗糙。进一步详细研究了两种海藻颗粒(条浒苔与马尾藻)在流化床内单次投料下的燃烧。随着床温的升高,条浒苔释放NOx相对浓度增加,CO相对浓度减少。而马尾藻释放气体中SO2与NOx含量相对条浒苔有所增加;随着床温的升高,CO相对浓度减少。床温的升高使得床内传热速率加快,两种海藻挥发分的析出提前,燃尽时间缩短。风速、床高的升高使得两种海藻燃烧容易,燃尽时间缩短。

关键词: 海藻生物质, 流化床, 床温, 风速, 床高

Abstract: Fluidized bed combustion experiment of two seaweed particles(Enteromorpha clathrata and Sargassum natans)was carried out in a bench-scale combustor.When seaweed particles were fed into the fluidized bed, dehydration and release of volatile matter happened.Devolatilization and burning of volatile matter of seaweed particles during fluidized bed combustion happened in about 1 min, followed by combustion of char.Combustion of char accorded with the shrinking core model in which carbon nucleus burned layer by layer from outside to inside and ash layer radius remained almost constant.As volatile matter was released at the beginning of combustion, Sargassum natans particles fractured immediately after they were fed into the fluidized bed.SEM analysis was used to study the cross-sections of Enteromorpha clathrata particles and their chars collected at different combustion periods.During the combustion process of Enteromorpha clathrata particles, internal porosity of particles increased gradually.The micro-pore surface became rougher.By feeding a few seaweed particles at a time,combustion of two seaweed particles(Enteromorpha clathrata,Sargassum natans)was also studied in the fluidized bed.During combustion of Enteromorpha clathrata particles, relative concentration of NOx increased, while relative concentration of CO decreased.The SO2 and NOx released from Sargassum natans particles were more than those from Enteromorpha clathrata particles.CO concentration also decreased with increasing bed temperature.Increasing bed temperature intensified heat transfer in the combustor. Devolatilization of two kinds of seaweed happened earlier, and burnout time both shortened.Increase of air velocity and bed height facilitated combustion of two kinds of seaweed and shortened their burnout time.

Key words: seaweed biomass, fluildized bed, bed temperature, air velocity, bed height

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