An experimental study of ignition and combustion of single biomass pellets in air and oxy-fuel
An experimental study of ignition and combustion of single biomass pellets in air and oxy-fuel
复制标题
单一生物质颗粒在空气和富氧燃料中点火和燃烧的实验研究
DOI：
10.1016/j.fuel.2016.09.069
复制
发表时间：
2017-01
期刊：
影响因子：
7.4
通讯作者：
Zhou K
中科院分区：
文献类型：
--
作者：
Shan F;Lin Q;Zhou K
本研究提出了一种实验研究的点火和燃烧特性的单生物质颗粒在空气和O2/CO2气氛中含有21%，30%，40%，50%和100%的氧气摩尔分数。在本实验中，生物质颗粒周围的气体温度分别设定为873 K、973 K和1073 K。将并流气体的速率设定为10 L/min、15 L/min和20 L/min。将白皮松和稻壳的单颗粒固定在热电偶上并在垂直加热管式炉中燃烧。采用高速摄影技术记录了生物质颗粒燃烧过程的图像。所得图像显示了两种点火行为：（1）挥发分的均相点火和（2）颗粒表面的非均相点火。着火后，燃烧不再是挥发分的均匀燃烧。当氧浓度超过50%时，生物质呈现出非均相燃烧。同样，当O2浓度增加时，火焰变得更短，更稳定。在相同氧浓度下，CO2取代N2后，着火延迟期、内点火温度和挥发分燃烧时间均增加。然而，当氧浓度超过21%时（即在氧燃料的条件下），这些参数相应地减小。换句话说，点火和燃烧强度增加。氧气浓度和并流温度对生物质颗粒着火和燃烧的影响大于并流速度。研究结果表明，生物质颗粒在燃烧过程中没有破裂。
This study presents an experimental investigation of the ignition and combustion characteristics of single biomass pellets in air and O2/CO2atmospheres containing 21%, 30%, 40%, 50% and 100% oxygen mole fractions. In this experiment, the temperature of the gas surrounding the biomass pellets was set respectively at 873 K, 973 K and 1073 K. The rate of co-flow gas was set at 10 L/min, 15 L/min and 20 L/min. Single pellets ofPinusbungeanaand rice husk were fixed on a thermocouple and burned in a vertical heating tube furnace. High-speed photography was used to record images of the combustion process of biomass pellets. The resulting images exhibit two ignition behaviors: (1) homogeneous ignition of volatile, and (2) heterogeneous ignition on the particles’ surface. After ignition, the combustion was no longer a homogeneous combustion of volatile. When the oxygen concentration exceeded 50%, the biomass showed a hetero-homogeneous combustion. Similarly, when the concentration of O2increased, the flame became shorter and more stable. With the same oxygen concentration, and once the N2was replaced by CO2, the ignition delay, internal ignition temperature and the volatile combustion time increased. Inversely, when the oxygen concentration exceeded 21% (i.e. under the conditions of oxy-fuel), these parameters were correspondingly reduced. In other words, the ignition and combustion intensity were increased. The effects of oxygen concentration and co-flow temperature on ignition and combustion of biomass pellets were greater than that of co-flow velocity. The study’s results show that the biomass pellets did not break during combustion.
登录
查看更多内容
影响因子：
5.3
作者：
Holtmeyer, Melissa L.;Li, Gengda;Axelbaum, Richard L.
通讯作者：
Axelbaum, Richard L.
影响因子：
7.4
作者：
B. Arias;C. Pevida;F. Rubiera;J. J. Pis-J.
通讯作者：
B. Arias;C. Pevida;F. Rubiera;J. J. Pis-J.
影响因子：
4.2
作者：
C. Blasi;A. Hernandez;A. Santoro
通讯作者：
C. Blasi;A. Hernandez;A. Santoro
影响因子：
7.4
作者：
Hao Liu;Ramlan Zailani;B. M. Gibbs
通讯作者：
Hao Liu;Ramlan Zailani;B. M. Gibbs
影响因子：
9
作者：
C. Kristöfel;C. Strasser;E. Schmid;Ulrich B. Morawetz
通讯作者：
C. Kristöfel;C. Strasser;E. Schmid;Ulrich B. Morawetz