Effect of voidage on the smoldering of the mixed dust layer of wood dust and shavings on a hot plate

IF 4.2 2区 工程技术 Q2 ENGINEERING, CHEMICAL Advanced Powder Technology Pub Date : 2024-09-11 DOI:10.1016/j.apt.2024.104643
Zhenguo Du, Jinglin Zhang, Lingfeng Wang, Zhiyang Zhang, Gang Li, Chunmiao Yuan
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Abstract

In the wood processing industry, wood dust commonly mixes with other processing by-products to form piles, which generally have large voidage due to differences in component sizes. It is essential to understand the effect of voidage on the true ignition and smoldering behavior of wood dust layer on hot plates. In this study, wood dust and shavings were selected as experimental materials. The effects of voidage on the minimum ignition temperature of the dust layer (MITL), ignition delay time, and smoldering behaviors were investigated by means of a hot plate test. The results showed that the addition of large-sized shaving particles significantly enhanced the overall voidage of the dust layer. With the increased deposit voidage, the ignition delay time decreased, and smoldering propagation accelerated. When the shavings content was less than 50%, the MITL decreased; however, further addition of shavings significantly increased the MITL. The analysis shows that voidage affects the ignition and smoldering behavior of the dust layer mainly by influencing oxygen transport and heat transfer processes. These findings offer a new insight for the prevention and control of dust fires under real working conditions.

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空隙对热板上木屑和刨花混合粉尘层燃烧的影响
在木材加工业中,木屑通常会与其他加工副产品混合成堆,由于成分大小不同,这些木屑一般都有较大的空隙。了解空隙对木粉层在热板上的真正点火和燃烧行为的影响至关重要。本研究选择了木粉和刨花作为实验材料。通过热板试验研究了空隙对粉尘层最低着火温度(MITL)、着火延迟时间和燃烧行为的影响。结果表明,大尺寸刨花颗粒的加入显著提高了粉尘层的整体空隙率。随着沉积空隙率的增加,点火延迟时间缩短,燃烧传播速度加快。当刨花含量小于 50%时,MITL 下降;然而,刨花的进一步增加会显著提高 MITL。分析表明,空隙主要通过影响氧气传输和传热过程来影响粉尘层的点火和燃烧行为。这些发现为在实际工作条件下预防和控制粉尘火灾提供了新的思路。
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来源期刊
Advanced Powder Technology
Advanced Powder Technology 工程技术-工程:化工
CiteScore
9.50
自引率
7.70%
发文量
424
审稿时长
55 days
期刊介绍: The aim of Advanced Powder Technology is to meet the demand for an international journal that integrates all aspects of science and technology research on powder and particulate materials. The journal fulfills this purpose by publishing original research papers, rapid communications, reviews, and translated articles by prominent researchers worldwide. The editorial work of Advanced Powder Technology, which was founded as the International Journal of the Society of Powder Technology, Japan, is now shared by distinguished board members, who operate in a unique framework designed to respond to the increasing global demand for articles on not only powder and particles, but also on various materials produced from them. Advanced Powder Technology covers various areas, but a discussion of powder and particles is required in articles. Topics include: Production of powder and particulate materials in gases and liquids(nanoparticles, fine ceramics, pharmaceuticals, novel functional materials, etc.); Aerosol and colloidal processing; Powder and particle characterization; Dynamics and phenomena; Calculation and simulation (CFD, DEM, Monte Carlo method, population balance, etc.); Measurement and control of powder processes; Particle modification; Comminution; Powder handling and operations (storage, transport, granulation, separation, fluidization, etc.)
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