Experimental study on the inertization of wood-based biomass with solid inerts

IF 3.4 3区 工程技术 Q2 ENGINEERING, CIVIL Fire Safety Journal Pub Date : 2024-07-15 DOI:10.1016/j.firesaf.2024.104223
Nieves Fernandez-Anez, Bjarne C. Hagen
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Abstract

Wood pellets are one of the primary solid substitutes for fossil fuels worldwide. They present both advantages and disadvantages that have been widely studied, where one of the main disadvantages is the risk of self-heating, which may lead to smouldering combustion or explosion. The risk of smouldering increases with decreasing particle size, while the difference in fire behaviour due to particle sizes needs to be studied in more detail. One of the techniques used to avoid, or decrease, the risk of smouldering is inertization. Inertization with gases is ineffective due to the difficulty gas has in accessing all voids in solid materials. An alternative solution is to use inert solids instead of gas.

This research empirically studies the fire behaviour of wood pellets and wood dust with particle size of less than 1 mm, and the influence of solid inertization in both materials in two different configurations: mixed and layered. The ignition initiation of both particle sizes is similar, while the cool-down phase is quicker in the case of dust. However, inertization of dust needs a significantly higher amount of inert solids than in the case of pellets, being easier to avoid smouldering when the inerts are disposed in layers rather than mixed with the materials.

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木质生物质与固体惰性物质惰性化实验研究
木质颗粒是全球化石燃料的主要固体替代品之一。它们的优点和缺点都已被广泛研究,其中一个主要缺点是有自热的风险,可能导致闷烧或爆炸。烟熏的风险随着颗粒大小的减小而增加,而颗粒大小导致的火灾行为差异还需要更详细的研究。惰化是避免或降低烟熏风险的技术之一。由于气体难以进入固体材料的所有空隙,因此使用气体惰化的效果不佳。本研究对粒径小于 1 毫米的木粒和木粉的燃烧行为进行了实证研究,并研究了两种不同结构(混合结构和分层结构)的固体惰化对这两种材料的影响。两种粒度的起火过程相似,而粉尘的冷却阶段更快。不过,粉尘的惰性化所需的惰性固体量明显高于颗粒,当惰性物质分层放置而不是与材料混合时,更容易避免烟熏。
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来源期刊
Fire Safety Journal
Fire Safety Journal 工程技术-材料科学:综合
CiteScore
5.70
自引率
9.70%
发文量
153
审稿时长
60 days
期刊介绍: Fire Safety Journal is the leading publication dealing with all aspects of fire safety engineering. Its scope is purposefully wide, as it is deemed important to encourage papers from all sources within this multidisciplinary subject, thus providing a forum for its further development as a distinct engineering discipline. This is an essential step towards gaining a status equal to that enjoyed by the other engineering disciplines.
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