Exploration of corn starch dust combustion and explosion mechanisms via thermal decomposition and functional group changes

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-18 DOI:10.1016/j.powtec.2025.120816

Bing Wang , Chuanbiao Zhang , Xin Zhang , Yue Zhao , Suyue Li , Runqing Liu , Shaoqian Cheng , Yanhua Lan , Yang Zhang , Weiguo Cao

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Abstract

In specific conditions, corn starch, due to its explosive characteristics as a fine powder, can act as a catalyst for a dust explosion. In this paper, test techniques were utilized to examine the thermal decomposition and ignition process of corn starch, as well as to probe into its fundamental combustion mechanism. Upon increasing the concentration of corn starch, there was an initial tendency for both the flame propagation velocity and length to rise, followed by a subsequent decrease. The results revealed that a large amount of volatile gases was precipitated from corn starch during pyrolysis, and these gases reacted with oxygen during combustion. The reaction rate was related to the concentration of corn starch, causing the flame propagation velocity and length to initially show an increasing trend and then decrease as the concentration of corn starch increased. Combined with the In-situ DRIFTS test, the study investigated the change process of surface functional groups during the combustion of corn starch. The combustion process of corn starch conforms to the mechanism of surface heterogeneous ignition. When combustion occurred rapidly, the temperature during volatile matter combustion reflectd that of corn starch particle combustion, making corn starch more prone to surface ignition.

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从热分解和官能团变化探讨玉米淀粉粉尘燃烧爆炸机理

在特定条件下，玉米淀粉由于其作为细粉的爆炸特性，可以作为粉尘爆炸的催化剂。本文采用测试技术对玉米淀粉的热分解和着火过程进行了研究，探讨了玉米淀粉的基本燃烧机理。随着玉米淀粉浓度的增加，火焰的传播速度和长度都有先上升后下降的趋势。结果表明，玉米淀粉在热解过程中析出大量挥发性气体，这些气体在燃烧过程中与氧气发生反应。反应速率与玉米淀粉的浓度有关，随着玉米淀粉浓度的增加，火焰的传播速度和长度呈现先增大后减小的趋势。结合原位DRIFTS试验，研究了玉米淀粉燃烧过程中表面官能团的变化过程。玉米淀粉的燃烧过程符合表面非均相着火机理。当燃烧快速发生时，挥发分燃烧时的温度反映了玉米淀粉颗粒燃烧时的温度，使玉米淀粉更容易发生表面着火。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.