The effects of ventilation parameters on the migration behaviors of head-on dusts in the heading face

Nie, Wen; Wei, Wenle; Ma, Xiao; Liu, Yanghao; Peng, Huitian; Liu, Qiang

doi:10.1016/j.tust.2017.09.017

Cited by 97 publications

(17 citation statements)

References 5 publications

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“…However, NC is often powdered for specific purposes, and its particle size is on the micrometer scale. Its fine particles readily escape confinement to constitute dust clouds, causing enormous amounts of dust generated during storage, transportation, manufacturing, or discard, thereby increasing the risk of dust explosion . Therefore, dust control or removal of NC is crucial in chemical industries.…”

Section: Introductionmentioning

confidence: 99%

“…Its fine particles readily escape confinement to constitute dust clouds, causing enormous amounts of dust generated during storage, transportation, manufacturing, or discard, thereby increasing the risk of dust explosion. 12 Therefore, dust control or removal of NC is crucial in chemical industries. Commonly applied technologies and materials to control dust generation and dispersion include water injection or spraying for dust reduction (not adapted for metal powders or water sensitive chemicals), a variety of precipitators (installation of the antielectrostatic device for flammable dust), ventilation, and chemical dust suppressants (CDSs).…”

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confidence: 99%

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Inhibitory effects of three chemical dust suppressants on nitrocellulose dust cloud explosion

et al. 2020

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Three types of self‐prepared chemical dust suppressants (CDSs) were investigated for their inhibitory effects on nitrocellulose (NC) cloud dust explosion. The results revealed that NC is extremely sensitive to electric sparks and has a high explosion intensity. CaCl2‐CDS effectively increased the particle size to control fly dust substantially inhibiting dust cloud explosions. However, both Na2SO4‐CDS and MgCl2‐CDS exhibited poor abilities and even promoted explosion. Therefore, neither Na2SO4‐CDS nor MgCl2‐CDS is recommended as a CDS for NC. Inappropriately using CDSs may engender severe explosions. Furthermore, a mechanism underlying NC dust cloud combustion and explosion was proposed. NC has three stages of heat release: autoxidation, thermal decomposition, and combustion. Thermal decomposition, combustion, and explosion were triggered depending on the energy provided from autoxidation. CaCl2‐CDS inhibited only combustion. This study reveals the mechanism underlying NC dust cloud explosions and provides useful information for the development of more optimized CDSs.

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Inhibitory effects of three chemical dust suppressants on nitrocellulose dust cloud explosion

et al. 2020

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“…Therefore, the structure determines, to a great extent, the occurrence and flow characteristics of gas and liquid in coal seam. As a result, the study on micro-pore structure of coal is significant to the drainage of gas from coal seam, water injection in coal seam and spontaneous combustion of coal [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Water Injection Seepage Law in Micro Porous Structure of Coal

Zhou¹,

Qiu

Zhang

et al. 2020

Teh. vjesn

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In this paper, a nano Voxel X-ray 3D microscope is used to scan the long flame coal samples and to reconstruct the 3D pore structure by the use of microscopic computed tomography. With image segmentation technique, a model of micro-pore structure of coal is obtained from the reconstructed coal. With different planes selected as seepage inlets, a numerical simulation of low-pressure water seepage is conducted. Studies show that water pressure gradually decreases along the direction of water seepage and reaches the maximum at the pore-pipes with good connectivity near the inlet. Due to the difference between the structure and development direction of pores in the three dimensions, there is an optimal seepage outlet that is most appropriately corresponding to each seepage inlet. When different planes are selected as seepage inlets, the velocity of each seepage outlet is positively correlated with the seepage mass flow rate at the outlet.

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“…Although those aspects have been extensively discussed by domestic and overseas scholars, their studies are mainly focused on certain individual characteristics, without covering the entire suite of metrics [49][50][51][52][53]; also, those cementing dust suppressants are subject to certain disadvantages, including toxicity, lack of biodegradability, and the tendency to cause secondary pollution, etc. [54][55][56][57][58][59][60]. To address the aforementioned problems, the present study uses biodegradable and environmentally-friendly soybean protein isolate (SPI) as the main material.…”

Section: Introductionmentioning

confidence: 99%

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Nie

Zhang

et al. 2019

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Aiming to further improve the dust suppression performance of the dust suppressant, the present study independently develops a new type of biodegradable environmentally-friendly dust suppressant. Specifically, the naturally occurring biodegradable soybean protein isolate (SPI) is selected as the main material, which is subject to an anionic surfactant, i.e., sodium dodecyl sulfonate (SDS) for modification with the presence of additives including carboxymethylcellulose sodium and methanesiliconic acid sodium. As a result, the SDS-SPI cementing dust suppressant is produced. The present study experimentally tests solutions with eight different dust suppressant concentrations under the same experimental condition, so as to evaluate their dust suppression performances. Key metrics considered include water retention capability, cementing power and dust suppression efficiency. The optimal concentration of dust suppressant solution is determined by collectively comparing these metrics. The experiments indicate that the optimal dust suppressant concentration is 3%, at which level the newly developed environmentally-friendly dust suppressant solution exhibits a decent dust suppression characteristic, with the water retention power reaching its peak level, and the corresponding viscosity being 12.96 mPa·s. This performance can generally meet the requirements imposed by coal mines. The peak efficiency of dust suppression can reach 92.13%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the dust suppression mechanism of the developed dust suppressant. It was observed that a dense hardened shell formed on the surface of the pulverized coal particles sprayed with the dust suppressant. There is strong cementation between coal dust particles, and the cementation effect is better. This can effectively inhibit the re-entrainment of coal dust and reduce environmental pollution.

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The effects of ventilation parameters on the migration behaviors of head-on dusts in the heading face

Cited by 97 publications

References 5 publications

Inhibitory effects of three chemical dust suppressants on nitrocellulose dust cloud explosion

Inhibitory effects of three chemical dust suppressants on nitrocellulose dust cloud explosion

Numerical Simulation Analysis of Water Injection Seepage Law in Micro Porous Structure of Coal

Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

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