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中国电机工程学报 2008, 28(8) 79-83 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 核能与可再生能源发电 |
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棉秆在循环流化床中燃烧特性的实验研究 |
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金保升 孙志翱 章名耀 刘仁平 张勇 |
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洁净煤发电及燃烧技术教育部重点实验室(东南大学) 洁净煤发电及燃烧技术教育部重点实验室(东南大学) 洁净煤发电及燃烧技术教育部重点实验室(东南大学) 洁净煤发电及燃烧技术教育部重点实验室(东南大学) 洁净煤发电及燃烧技术教育部重点实验室(东南大学) |
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摘要：
该文介绍了长度为10~100 mm棉秆与弱酸性床料的混合流化特性，主要研究流化风速和棉秆与床料不同配比对混合均匀度的影响。实验结果表明，10~100 mm棉秆与一定粒径分布的床料，质量配比为1~2%，流化数N>3时，能较均匀地混合流化，但流化数N> 7时，混合均匀度有所降低。棉秆与床料配比对混合均匀度也有影响，棉秆的质量配比越小，混合得越均匀，所以设计循环流化床锅炉时流化风速、静止床高要选择合理。在0.5 MW CFB实验装置上研究了纯棉秆燃烧时，流化速度、二次风率和棉秆给料量对炉内温度场分布的影响，结果表明，根据CFB实际运行参数，当流化速度为4~4.5 m/s时，尽管此时混合均匀度有所降低，但并没有影响到密相区稳定燃烧，其温度能够维持在830~870 ℃。实验后放出的底渣没有出现烧结现象，基本保持原来的形貌，说明弱酸性床料能够适合棉秆循环流化床燃烧。 |
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关键词：
长棉秆
弱酸性床料
循环流化床
混合
炉温
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Experimental Study on Cotton Stalk Combustion in Circulating Fluidized Bed |
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JIN Bao-sheng SUN Zhi-ao ZHANG Ming-yao LIU Ren-ping ZHANG Yong |
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Abstract:
This paper reported the mixing characteristics of binary mixture of cotton stalk with 10-100 mm length and alternative bed material in a fluidized bed. Experiments on a cold test facility showed that pure cotton stalk can not be fluidized, and adding bed material can improve the fluidization condition. Effects of gas velocity and mass percentage of cotton stalk on mixing characteristics were investigated. Cotton stalk can mix well with bed material at fluidization number 3-7. The minimum fluidizing velocity of the binary mixture of cotton stalk and bed material can be obtained by experiments. The study concerning the temperature profile was performed on a circulating fluidized bed (CFB) test facility with a heat input of 0.5 MW. Effects of fluidizing velocity, secondary-air ratio and cotton stalk feed rate on the temperature profiles in boiler furnace were examined. According to the experimental results, when the fluidizing velocity is up to 4.5 m/s cotton stalk can still be burned stably in the dense bed. Alternative bed material is difficult to react with alkali metals from cotton stalk ash after combustion about 12 h. It conclude that alternative bed material is favorable for use in CFB during cotton stalk combustion. |
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Keywords:
long cotton stalk
weak acidic bed material
circulating fluidized bed
mixing
bed temperature
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收稿日期 2007-06-19 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 孙志翱 |
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作者简介: |
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作者Email: sunzhiao@163.com |
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| Copyright by 中国电机工程学报 |
