Release of Alkalis and Chlorine from Combustion of Waste Pinewood in a Fixed Bed
Release of Alkalis and Chlorine from Combustion of Waste Pinewood in a Fixed Bed
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DOI：
10.1021/acs.energyfuels.8b03970
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发表时间：
2019-01
期刊：
影响因子：
5.3
通讯作者：
Xiaoxiao Meng;Wei Zhou;Emad Rokni;Guoyou Chen;R. Sun;Y. Levendis
中科院分区：
文献类型：
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作者：
Xiaoxiao Meng;Wei Zhou;Emad Rokni;Guoyou Chen;R. Sun;Y. Levendis
生物质在锅炉中燃烧会释放出碱金属和氯，它们与硅和硫一起导致结渣、结垢、腐蚀和颗粒排放。本研究探讨了在实验室固定床燃烧炉中，一次风（在火下）流量、预热空气及其预热温度对松木片着火和燃烧速率以及碱金属和碱土金属（钾（K）、钠（Na）、钙（Ca）、镁（Mg））和氯的释放的影响。通过该床的空气流率，即过量空气，在0.085-0.237 kg/（m2 s）的范围内变化，导致总体过量一次空气系数λ在0.56 - 1.1之间变化。空气也在20-135 °C的范围内预热。结果表明，提高预热空气或空气预热温度都能提高火焰传播速率（着火速率）和燃料的质量燃烧速率。此外，所有受检病例的Cl释放几乎完全（>99%），而ALK的释放几乎完全（> 99%）。
Combustion of biomass in a boiler releases alkali metals and chlorine which, together with silicon and sulfur, are responsible for slagging, fouling, corrosion, and particulate emissions. This research investigated the effects of the primary (under-fire) air flow rate, ṁair, and its preheating temperature on the ignition and burning rates of pinewood chips in a laboratory fixed bed furnace and on the release of alkali metals and alkali earth metals (potassium (K), sodium (Na), calcium (Ca), magnesium (Mg)) and chlorine. The air flow rate, ṁair, through the bed was varied in the range of 0.085–0.237 kg/(m2 s), resulting in an overall excess primary air coefficient λ varying from 0.56 to 1.1. Air was also preheated in the range of 20–135 °C. Results showed that increasing either ṁair or the air preheat temperature increased the flame propagation rate (ignition rate) and the mass burning rate of the fuel. Moreover, the release of Cl was nearly complete (>99%) in all examined cases, whereas the release of alk...