Continuous in situ measurements of alkali species in the gasification of biomass
Continuous in situ measurements of alkali species in the gasification of biomass
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DOI：
10.1016/j.proci.2012.06.037
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发表时间：
2013
影响因子：
7.4
通讯作者：
C. Erbel;M. Mayerhofer;P. Monkhouse;M. Gaderer;H. Spliethoff
中科院分区：
文献类型：
--
作者：
C. Erbel;M. Mayerhofer;P. Monkhouse;M. Gaderer;H. Spliethoff
这项工作描述了第一个在线，原位测量生物质气化中的碱性物质，使用准分子激光诱导碎裂荧光（ELIF）。以水蒸气为气化介质，在鼓泡流化床反应器中对三种生物质颗粒燃料进行了不同操作条件下的气化实验。钾和钠的浓度在真实的时间内测量，每次测量持续数小时。钾的平均浓度范围为140至350 ppb，钠的平均浓度范围为1.7至60 ppb。还观察到在切断燃料供给之后碱的缓慢释放，这表明碱物质已经被吸收在床材料（橄榄石）中;这通过分析使用之前和之后的床材料来证实。考虑到橄榄石的结构/组成以及在气化过程中可能与碱和其他元素的相互作用，表明含碱层可能在床颗粒上形成，但似乎没有形成结晶相。这可以允许在床仍然是热的同时重新释放碱。
This work describes the first on-line, in situ measurement of alkali species in biomass gasification using excimer laser induced fragmentation fluorescence (ELIF). Three pelletised biomass fuels were gasified under different operating conditions in a bubbling fluidized-bed reactor, using steam as the gasifying medium. Concentrations of potassium and sodium were measured in real time for several hours per measurement. Average concentrations obtained for potassium ranged from 140 to 350ppb, and those for sodium ranged from 1.7 to 60ppb. Also observed was a slow release of alkali after shutting off the fuel feed, which suggests that alkali species had been taken up in the bed material (olivine); this was confirmed by analysing the bed material before and after use. Consideration of the olivine structure/composition and possible interactions with alkali and other elements during gasification suggests that alkali-containing layers could have formed on the bed particles but appear not to form crystalline phases. This may allow for re-release of alkali while the bed is still hot.