Oxy-fuel combustion of a single fuel particle in a fluidized bed: Char combustion characteristics, an experimental study
Oxy-fuel combustion of a single fuel particle in a fluidized bed: Char combustion characteristics, an experimental study
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流化床中单个燃料颗粒的氧燃料燃烧：炭燃烧特性，实验研究
DOI：
10.1016/j.cej.2015.11.078
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发表时间：
2016-03
影响因子：
15.1
通讯作者：
Ping Lu
中科院分区：
文献类型：
--
作者：
Alberto Gómez–Baread;Daoyin Liu;Bo Leckner;Ping Lu
The effect of an oxy-fuel atmosphere on char conversion in a fluidized bed (FB) was examined by comparing measurements of single fuel particles exposed to O2/N2and O2/CO2atmospheres. The experiments were carried out in a transparent and electrically heated FB at 1088 K and five O2inlet concentrations (ranging from 0 up to 40%vol) using four ranks of coal (from anthracite to lignite) and one type of wood, all with 6 mm (spherical) diameter. The evolution of temperature with time of the various fuels at different gas atmospheres and the microstructure of the char resulting after devolatilization are presented, from which the effect of the oxy-fuel atmosphere (changing CO2by N2at different fixed O2concentrations) on char combustion characteristics is determined and analyzed. Results show that the apparent average combustion rate of a fuel particle decreases (and consequently the burnout time increases) when changing O2/N2by O2/CO2. This effect was more significant at high O2concentrations and most notable for anthracite. Consistently, the time to reach the peak temperature was longer when shifting from O2/N2to O2/CO2. However, the char specific surface area, pore volume, and average pore diameter of char were not significantly modified by replacing N2with CO2.
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