...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>スマートプロセス学会誌 >高密度バイオマスブリケット燃焼挙動へのブリケットサイズの影響
【24h】

高密度バイオマスブリケット燃焼挙動へのブリケットサイズの影響

机译：型煤尺寸对高密度生物质型煤燃烧行为的影响

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To investigate the influence of briquette size on both flaming combustion and char combustion of highly densified biomass briquette, combustion experiments were carried out with the briquette made of cypress sawdust. In this study, three sizes of cylindrical briquette of which the ratio of height to diameter is kept at 2 ((1) 30 mm in diameter and 60 mm in height, (2) 35 mm in diameter and 70 mm in height and (3) 40 mm in diameter and 80 mm in height) were used as fuel samples. The density of the briquette and the moisture content are kept constant at 1300 kg/m~3 and 10 wt%, respectively. A single briquette is inserted into the furnace to which preheated air (673K, 1.42 m/s) is supplied and the mass loss rate and each combustion duration were measured. As a result, in the flaming combustion duration, it is observed that the average mass loss rate ((dM/dt)_(mcan)) of briquette per specific surface area (S/V,V: volume) is proportional to the surface area (S) of the briquette. In the briquette size used in the study, it is demonstrated by introducing Fourier number that the flaming combustion duration (t_c) is proportional to the square of an inverse number of the specific surface area (t_f∝ (V/S)~2). The normalized mass loss rate ((dM/M_0)/(dt/t_f)) in the normalized flaming combustion duration for all three briquette size can be expressed in a single curve. It is shown that the char combustion duration (t_c) is also proportional to the square of an inverse number of the specific surface area (t_c∝ (V/S)~2). For char combustion, shrinking-core reaction model was applied to the cylindrical briquette used in the study and the oxygen diffusion coefficients through both the gas boundary layer (K_c) and the ash layer (D_c) were determined by the experimental results. The oxygen diffusion coefficient through the ash layer (D_c) is lower than that reported for lower density one and this may be attributed to the lower porosity of the highly densified briquette in this study. It is successfully demonstrated that the unbumt fraction in the normalized char combustion duration can be expressed by the model.
机译：为了研究压块的大小对高密度生物质压块的燃烧和焦炭燃烧的影响，采用柏木屑制成的压块进行了燃烧实验。在这项研究中，三种尺寸的圆柱型煤球的高度与直径之比保持为2（（1）直径30 mm，高度60 mm，（2）直径35 mm，高度70 mm和（3直径40毫米，高度80毫米）用作燃料样品。团块的密度和水分含量分别保持恒定在1300 kg / m〜3和10 wt％。将单个团块插入炉中，向炉中提供预热的空气（673K，1.42 m / s），并测量质量损失率和各个燃烧持续时间。结果，在燃烧持续时间中，观察到每单位比表面积（S / V，V：体积）的团块的平均质量损失率（（dM / dt）_（mcan））与表面成正比。型煤区域（S）。在研究中使用的团块尺寸中，通过引入傅立叶数证明，燃烧持续时间（t_c）与比表面积的倒数（t_f∝（V / S）〜2）的平方成正比。所有三种团块尺寸的归一化燃烧持续时间中的归一化质量损失率（（dM / M_0）/（dt / t_f））可以用一条曲线表示。结果表明，焦炭燃烧持续时间（t_c）也与比表面积的倒数（t_c∝（V / S）〜2）的平方成正比。对于焦炭燃烧，将收缩核反应模型应用于研究中使用的圆柱型煤球，并通过实验结果确定通过气体边界层（K_c）和灰分层（D_c）的氧扩散系数。通过灰层的氧扩散系数（D_c）低于较低密度的氧扩散系数，这可能归因于本研究中高致密团块的较低孔隙率。成功地证明了该模型可以表示标准化焦炭燃烧持续时间中的未燃烧分数。

著录项

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