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首页> 外文期刊>Combustion Science and Technology >PARTICULATE MATTER FORMATION AND EMISSION IN THE COMBUSTION OF DIFFERENT PULVERIZED BIOMASS FUELS
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PARTICULATE MATTER FORMATION AND EMISSION IN THE COMBUSTION OF DIFFERENT PULVERIZED BIOMASS FUELS

机译：不同粉状生物质燃料燃烧中的特定物质形成和排放

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摘要

Particle formation and emission in the combustion of four (orujillo, eucalyptus, oak and chestnut tree) pulverized biomass fuels have been studied. The fuels have been burned in an entrained flow reactor, under controlled and realistic conditions. In all the cases, the final emission distributions contained at least two modes, one of them peaking at 30-200 nm, and the other being in the supermicron range. Alkali sulphates and chlorides account for most of the mass of the fine particles in all cases, while coarse particles essentially retain the inorganic matter properties of the original fuel. K_2SO_4 is experimentally found to start nucleation over 900℃ for orujillo, while KCl is not observed at this temperature. Condensation of KCl on these nuclei is observed in a sample taken at 560℃ and in a greater amount at 360℃. The same formation schema was found for the other biomass fuels; the much lower ash content of the latter is thought to cause a "delay" in the onset of these nucleation/ condensation steps along the gas cooling process. In spite of these differences, the global similarities observed among the studied fuels confirm the generality of the fine particle formation process in biomass combustion.
机译：研究了四种（orujillo，桉树，橡树和栗树）粉状生物质燃料燃烧过程中的颗粒形成和排放。燃料已在受控和现实条件下在气流床反应器中燃烧。在所有情况下，最终的发射分布至少包含两种模式，一种在30-200 nm处达到峰值，另一种在超微米范围内。在所有情况下，碱式硫酸盐和氯化物均占细颗粒的大部分，而粗颗粒则基本上保留了原始燃料的无机质。实验发现，对于orujillo，K_2SO_4在900℃以上开始成核，而在此温度下未观察到KCl。在560℃下采集的样品中观察到KCl在这些原子核上的凝结，而在360℃下观察到的数量更大。对于其他生物质燃料，发现了相同的形成方案。后者的低得多的灰分含量被认为在沿着气体冷却过程的这些成核/冷凝步骤的开始时引起“延迟”。尽管存在这些差异，但在研究的燃料中观察到的全球相似性证实了生物质燃烧中细颗粒形成过程的普遍性。

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