Experimental study on the influence of water immersion on the combustion and explosion characteristics of coal dust clouds of different ranks

IF 4.2 2区工程技术 Q2 ENGINEERING, CHEMICAL

Advanced Powder Technology Pub Date : 2024-11-26 DOI:10.1016/j.apt.2024.104734

Lingfeng Wang , Zhengdong Liu , Jinglin Zhang , Zhenguo Du , Shikai Bao , Zhiyang Zhang , Chang Li , Chunmiao Yuan

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Abstract

In order to elucidate the effects and mechanisms of water immersion on the ignition sensitivity and explosion characteristics of coal dust with different degrees of coalification, this study selected three types of coal dust samples with different ranks. The ignition sensitivity and explosion parameters of the coal dust samples before and after water immersion were measured using Godbert-Greenwald furnaces, Hartmann tubes, and a 20-L explosion chamber. The micro mechanisms causing the variations in the combustion and explosion characteristics of different coal dust samples were analyzed through TG/DTG-DSC and FTIR techniques. The results revealed that water immersion led to a more significant increase in the ignition sensitivity of low-rank coal dust and an overall enhancement in the explosion intensity of coal dust with different ranks. Variations in the characteristic temperatures and ranges of characteristic stages among the water-immersed coal samples of different ranks resulted in distinct changes in ignition behavior and explosion intensity. Furthermore, the water immersion process primarily influenced the hydroxyl functional group content in brown coal, while its impact on higher-rank coal dust samples was primarily observed in the oxygen-containing functional group region.

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浸水对不同等级煤尘云燃烧和爆炸特性影响的实验研究

为了阐明浸水对不同煤化程度煤粉着火敏感性和爆炸特性的影响和机理，本研究选择了三种不同等级的煤粉样品。利用戈伯特-格林沃尔德炉、哈特曼管和 20 升爆炸室测量了煤粉样品浸水前后的着火敏感性和爆炸参数。通过 TG/DTG-DSC 和傅立叶变换红外技术分析了导致不同煤粉样品燃烧和爆炸特性变化的微观机制。结果表明，水浸会使低等级煤粉的着火敏感性显著提高，并全面增强不同等级煤粉的爆炸强度。不同等级的水浸煤样的特征温度和特征阶段范围的变化导致了着火行为和爆炸强度的明显变化。此外，浸水过程主要影响褐煤中羟基官能团的含量，而对高等级煤粉样品的影响主要体现在含氧官能团区域。

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来源期刊

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.)