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Journal articles on the topic 'Dust; Explosion suppression'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lin, Chendi, Yingquan Qi, Xiangyang Gan, Hao Feng, Yan Wang, Wentao Ji, and Xiaoping Wen. "Investigation into the Suppression Effects of Inert Powders on the Minimum Ignition Temperature and the Minimum Ignition Energy of Polyethylene Dust." Processes 8, no. 3 (March 4, 2020): 294. http://dx.doi.org/10.3390/pr8030294.

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The risks associated with dust explosions still exist in industries that either process or handle combustible dust. This explosion risk could be prevented or mitigated by applying the principle of inherent safety. One effective principle is to add an inert material to a highly combustible material in order to decrease its ignition sensitivity. This paper deals with an experimental investigation of the influence of inert dust on the minimum ignition temperature and the minimum explosion energy of combustible dust. The experiments detailed here were performed in a Godbert–Greenwald (GG) furnace and a 1.2 L Hartmann tube. The combustible dust (polyethylene—PE; 800 mesh) and four inert powders (NaHCO3, Na2C2O4, KHCO3, and K2C2O4) were used. The suppression effects of the four inert powders on the minimum ignition temperature and the minimum explosion energy of the PE dust have been evaluated and compared with each other. The results show that all of the four different inert dusts have an effective suppression effect on the minimum ignition temperature and the minimum explosion energy of PE dust. However, the comparison of the results indicates that the suppression effect of bicarbonate dusts is better than that of oxalate dust. For the same kind of bicarbonate dusts, the suppression effects of potassium salt dusts are better than those of the sodium salt. The possible mechanisms for the better suppression effects of bicarbonate dusts and potassium salt dusts have been analyzed here.

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2

Bi, Haipu, Xiaolong Xie, Kaimin Wang, Yujie Cao, and Hui Shao. "A risk assessment methodology of aluminum dust explosion for polishing process based on laboratory tests." Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 235, no. 4 (January 17, 2021): 627–36. http://dx.doi.org/10.1177/1748006x20987377.

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The secondary dust explosion ignited by the primary explosion energy often causes greater damage to the just destroyed carrier. Therefore, the study of explosion risk as well as the risk reduction effect with suppression is key guard against the secondary and derivative explosions. A novel risk assessment methodology is presented based on Monte Carlo theory for numerically fitting pressure’s uncertainty changes and Crystal ball simulation for calculating explosion risk and its distribution probability of hazardous explosive dust. Taking the aluminum dust of a polishing process as an example, the fitted results show that the tested explosion pressure in laboratory presents the shape of lognormal distribution with average pressure of 0.27 MPa on the condition of 500 g/m3 aluminum dust with median particle diameter at 35 μm. The simulated results show that the risk possibility of myringorupture injury, pneumorrhagia injury, and structure damage all approaches 100% because of the high explosion pressure considering the potential percentage of injury or damage at 50%. However, the risk possibility reduces to 14.27%, 0.13%, and 42.05% with suppressants of ammonium dihydrogen phosphate at 10%, respectively. The proposed method of risk assessment for dust explosion and its suppression provides scientific basis for strategy optimization of dust explosion protection and safe production of fine explosive dust related industry.

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3

Vogl, Albrecht, and Siegfried Radandt. "New Findings for Explosion Protection of Bucket Elevators by Design Measures." Advanced Materials Research 508 (April 2012): 127–33. http://dx.doi.org/10.4028/www.scientific.net/amr.508.127.

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Bucket elevators are devices for the vertical conveying of bulk materials. They can be found in many plants where silos are used. There are different designs of bucket elevators, whereby for the conveying of combustible bulk materials twin-leg bucket elevators are widely used. The conveyed bulk materials might be quite different, e.g. granulates, grains or pellets, which can contain more or less fine dust. The fine dust will be whirled up and dispersed by the moving buckets. Explosive dust/air mixtures can occur inside the elevator. Bucket elevators are frequently reported as causes of dust explosions [1, 2]. Depending on both the practical operating conditions and the explosion characteristics of the bulk material in many cases explosion protection by prevention of ignition sources are not sufficient to minimize the risk of a dust explosion. Therefore, additional explosion protection by design measures is required in order to limit the dangerous effects of a dust explosion. The technical rules or standards, however, which are available for the layout of explosion protection by design measures, e.g. explosion pressure venting or explosion suppression can not be used due to the specific geometry of bucket elevators. Because there was no sufficient data base to design explosion resistant bucket elevators in combination with explosion venting or explosion suppression, large scale tests were carried out on the test site of BGN and FSA in Kappelrodeck, Germany. In this paper the latest results and findings will be presented which can be used for the practical design of explosion venting and explosion suppression on bucket elevators in process industries.

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4

Zavialova, Оlena. "IMPROVEMENT OF MEANS OF LOCALIZATION OF COAL DUST EXPLOSIONS." JOURNAL of Donetsk mining institute, no. 1 (2021): 110–18. http://dx.doi.org/10.31474/1999-981x-2021-1-110-118.

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Purpose. Improving the design of coal dust explosion localization devices to increase their speed, premature creation of an effective barrier from the cloud of extinguishing agent by reliable suppression of the fire front and, as a consequence, stop the spread of explosion on the mine, which will increase personnel protection from negative explosion factors. Methods. A comprehensive approach was used, which includes analysis and generalization of statistical data on explosions of methane-air and dust-air mixtures in mines of Ukraine, critical analysis of means for localization of coal dust explosions, computer modeling of rock deformations during the explosion. Results. The obtained data on the redistribution of explosion energy in the mountain massif allowed to scientifically substantiate a qualitatively new approach to obtaining information about the approach of the shock front. The results of the study confirmed that the loosening of dust accumulations under the influence of seismic waves, which are significantly ahead of the explosion front moving along the production, creates conditions for the formation of explosive dust concentration in front of the fire front. But early signaling from the seismic sensor of the presence of an explosion contributes to the formation of an explosion-proof environment to the approach of the fire front and provides prevention of the combustible environment and the creation of a non-combustible zone in the path of the fire front. Scientific novelty. A fundamentally new approach to explosion detection in mining is substantiated and a new design of a device for localization of coal dust explosions based on the disclosure of the mechanism of explosion energy propagation in the mountain environment is proposed. Practical significance. The use of the proposed device for localization of coal dust explosions allows to accelerate the localization of dust explosions, to create an effective barrier from the cloud of extinguishing agent by reliably suppressing the fire front and as a result to create an explosion-proof environment in mining.

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5

Johnson, Catherine, Barbara Rutter, Christopher Urban, Joseph Schott, David Doucet, Chance Moore, and Kyle Perry. "Small-scale testing of coal dust explosion propagation and relation to active barrier suppression systems." New Trends in Production Engineering 2, no. 1 (October 1, 2019): 321–29. http://dx.doi.org/10.2478/ntpe-2019-0034.

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Abstract Coal dust explosions are a lethal threat to anyone working in an underground coal mine. Many coal mining countries including Australia and much of Europe already utilize passive barrier explosion suppressant systems but due to differences in ventilation patterns in the United States, simple passive systems such as the bagged barrier are not as cost effective. Active systems are triggered by properties of an explosion, such as pressure, heat, or light, and release or project a suppressant into the environment to suppress an explosion. To deploy an active system, the best sensor and suppressant release location and spacing must be determined; this must account for total system latency and explosive propagation speed. A 10:1 model of a longwall entry system has been developed to study the pressure wave propagation of coal dust explosions and consequent triggering of different suppressants. The scaled model, with its removable stoppings, allows multiple potential propagation pathways for an explosion to be repeatedly tested, different from typical straight shock tunnel tests. The layout also facilitates the placement of sensors and cameras to fully observe and document the tests. The pressure wave characteristics found at crosscuts and corners will aid in the development of active barrier trigger systems and spacing of suppressant release locations.

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6

Wang, Junfeng, Xiangbao Meng, Ke Yan, and Jinshe Chen. "Suppression of Aluminum Dust Explosion by Ca(H2PO4)2/RM Composite Powder with Core–Shell Structure: Effect and Mechanism." Processes 7, no. 10 (October 18, 2019): 761. http://dx.doi.org/10.3390/pr7100761.

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A Ca(H2PO4)2/RM composite powder suppressant with core–shell structure was prepared with modified red mud (RM) as the carrier and Ca(H2PO4)2 as the loaded particles, using a solvent–antisolvent process, in an attempt to suppress aluminum dust explosion more effectively. The suppression effects of the Ca(H2PO4)2/RM composite powder suppressant for aluminum dust flame propagation and for explosion overpressure were tested in a vertical glass tube test apparatus and a 20 L explosion vessel. The results show that the Ca(H2PO4)2/RM composite powder suppressant was more effective in suppressing aluminum dust flame propagation and explosion overpressure than either Ca(H2PO4)2 or RM powder alone. Finally, the suppression mechanism of the Ca(H2PO4)2/RM composite powder suppressant was analyzed. On the one hand, a large amount of burning heat was absorbed through the decomposition of Ca(H2PO4)2 and the melting phase transformation of the decomposition product; on the other hand, the strong isolation provided by the RM helped limit flame propagation. The strong adsorptivity of RM allowed this material to adsorb the radicals from the explosion reaction perfectly.

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7

Wang, Yan, Chen-di Lin, Ying-quan Qi, Bei Pei, Lan-yun Wang, and Wen-tao Ji. "Suppression of polyethylene dust explosion by sodium bicarbonate." Powder Technology 367 (May 2020): 206–12. http://dx.doi.org/10.1016/j.powtec.2020.03.049.

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8

Oleszczak, P., and R. Klemens. "Mathematical modelling of dust–air mixture explosion suppression." Journal of Loss Prevention in the Process Industries 19, no. 2-3 (March 2006): 187–93. http://dx.doi.org/10.1016/j.jlp.2005.05.013.

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9

Amrogowicz, J., and W. Kordylewski. "Effectiveness of dust explosion suppression by carbonates and phosphates." Combustion and Flame 85, no. 3-4 (June 1991): 520–22. http://dx.doi.org/10.1016/0010-2180(91)90155-5.

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10

Huang, Chuyuan, Xianfeng Chen, Bihe Yuan, Hongming Zhang, Huaming Dai, Song He, Ying Zhang, Yi Niu, and Shifei Shen. "Suppression of wood dust explosion by ultrafine magnesium hydroxide." Journal of Hazardous Materials 378 (October 2019): 120723. http://dx.doi.org/10.1016/j.jhazmat.2019.05.116.

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11

Zhang, Shulin, Mingshu Bi, Haipeng Jiang, and Wei Gao. "Suppression effect of inert gases on aluminum dust explosion." Powder Technology 388 (August 2021): 90–99. http://dx.doi.org/10.1016/j.powtec.2021.04.073.

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12

Klemens, Rudolf, Michal Kaluzny, and Marian Gieras. "SUPPRESSION OF DUST EXPLOSIONS BY MEANS OF AN ACTIVE SUPERFAST EXPLOSION-SUPPRESSION SYSTEM OF FIVE LITER VOLUME." International Journal of Energetic Materials and Chemical Propulsion 9, no. 1 (2010): 1–26. http://dx.doi.org/10.1615/intjenergeticmaterialschemprop.v9.i1.10.

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13

Nie, Bai Sheng, Ru Ming Zhang, Xue Qiu He, Xiang Chun Li, Hui Wang, and Sheng Rui Zhai. "Potential Applications of Foam Ceramics in Gas Explosion Prevention." Advanced Materials Research 284-286 (July 2011): 1330–34. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.1330.

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Explosion suppression and isolation apparatus act as the last barrier to minimize casualties and property loss. Regrettably, the present techniques, such as water tubs and dust barriers, cannot effectively suppress multiple and continuous explosions. Being a porous medium, foam ceramics are characterized with large porosity and strong resistance against high temperature and shocks. Theoretical analysis and experimental study suggest that, due to numerous collisions with the walls in foam ceramics, the free radicals –generated in the chemical reactions of gas combustion and responsible for flame propagation, can be significantly destroyed, the reactive heat release be restrained, thus making the chemical reactions non-self-sustained. As a result, flame propagation is quenched. Furthermore, foam ceramics can markedly attenuate shock waves. Thus, if properly designed and arranged in the roadways, the material is expected to become a new-generation gas explosion suppression and isolation method in coal mines.

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14

Liu, Bo, Yuyuan Zhang, Kaili Xu, Yansong Zhang, Zheng Hao, and Ning Ma. "Study on a New Type of Composite Powder Explosion Inhibitor Used to Suppress Underground Coal Dust Explosion." Applied Sciences 11, no. 18 (September 14, 2021): 8512. http://dx.doi.org/10.3390/app11188512.

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At present, the world is committed to the development of environmentally friendly, sustainable and industrial safety. The effective treatment of industrial solid waste can be applied in the field of industrial safety. It is one of the ways to apply industrial solid waste to industrial safety to modify industrial solid waste and combine active powder to prepare industrial solid waste-based composite powder explosion inhibitors and apply it to underground coal dust explosion. This paper introduces the modification and preparation methods of industrial solid waste, and analyzes the good explosion suppression effect and good economic benefit of industrial solid waste-based composite powder explosion inhibitors on coal dust explosion. In this paper, four kinds of industrial solid wastes (red mud, slag, fly ash and sludge) were modified, and the modified solid waste materials with good carrier characteristics were obtained. Combined with a variety of active powders (NaHCO3, KH2PO4 and Al(OH)3), the industrial solid waste-based composite powder explosion inhibitors were obtained by solvent-crystallization (WCSC) and dry coating by ball milling (DCBM). Those kinds of explosion inhibitors can suppress the explosion of pulverized coal in 40–50% of cases. Compared with the powder explosion inhibitor commonly used in industry, it has a lower production cost and better explosion suppression effect. Those kinds of explosion inhibitors have a good industrial application prospect.

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15

TANAKA, Tatsuo. "Calculating the Suppression Effect of Dust Explosion by Use of the Diluent Dusts." Journal of the Society of Powder Technology, Japan 32, no. 11 (1995): 812–15. http://dx.doi.org/10.4164/sptj.32.812.

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16

Lebecki, K., J. Śliż, K. Cybulski, and Z. Dyduch. "Efficiency of triggered barriers in dust explosion suppression in galleries." Journal of Loss Prevention in the Process Industries 14, no. 6 (November 2001): 489–94. http://dx.doi.org/10.1016/s0950-4230(01)00056-0.

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17

Jiang, Haipeng, Mingshu Bi, Qingkui Peng, and Wei Gao. "Suppression of pulverized biomass dust explosion by NaHCO3 and NH4H2PO4." Renewable Energy 147 (March 2020): 2046–55. http://dx.doi.org/10.1016/j.renene.2019.10.026.

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18

Shchokin, V. P., V. G. Nalyvaiko, and V. V. Ezhov. "Використання водного розчину ПАР Лексол® для зв’язування пилу на автодорогах кар’єрів i зниження пиловиділення при проведенні масових вибухів." Ukrainian Journal of Ecology 8, no. 1 (March 10, 2018): 755–61. http://dx.doi.org/10.15421/2018_277.

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<p><span lang="EN-US">In carrying out mass explosions in quarries, a considerable amount of dust and gases is emitted into the atmosphere, more than in other technological processes of mining. The dusty cloud formed during the explosion pollutes the atmosphere not only of quarries and their industrial sites, but also the territory adjacent to them. However, the known methods and measures to reduce dust and gas emissions into the atmosphere during mass explosions have not solved this problem yet. In addition, the implementation of most methods involves certain financial costs. Therefore, the development of new ways to moisten career blocks with solutions of modern reagents produced in Ukraine is necessary and relevant. Considering the increase in the depth of quarries and, as a consequence, the extension of the length of quarry roads, the authors proved that these factors lead to an increase in the amount of dust formation from the road surface. In this regard, the solution of the problem of reducing the dust generation on the quarry roads is an important and relevant. This work is devoted to an experimental study of the determination of the effectiveness of the use of an aqueous solution of the surfactant "Leksol" to reduce dust emission during mass explosions and dust binding on the quarry roads. The problem is solved by means of industrial research to determine the effectiveness of reducing dust formation during mass explosions by pre-wetting quarry blocks with aqueous surfactant "Leksol" and binding dust on quarry roads during their watering with proposed aqueous reagent solution. The studies have confirmed the process of binding with surfactant "Leksol" of fine dust particles remaining on the surface of the quarry block after drilling on the surface thereof, and are actively involved in the overall process of formation of dust and gas cloud. At the concentration of the aqueous solution of the anti-dust reagent "Lexol-5" 5%, the average efficiency of dust suppression was 21%.</span></p>

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19

KOSAREV, Nikolay Petrovich, Vladimir Nikolaevich MAKAROV, Aleksandr Vladimirovich UGOL'NIKOV, Nikolay Vladimirovich MAKAROV, and German Petrovich DYLDIN. "Mine aerology of dust aerosols under conditions of hydro-vortex coagulation." NEWS of the Ural State Mining University, no. 4 (December 20, 2020): 155–65. http://dx.doi.org/10.21440/2307-2091-2020-4-155-165.

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Dust suppression is the most popular method for depositing dust from the air to blast isolation. Improving the isolation system for probable coal dust explosions is an integral part of the problem of dust explosion protection of mining enterprises, the solution of which is one of the most important tasks in the field of occupational safety and health. Purpose: study of physics of the process and the construction of a mathematical model of the movement of aerosols in mine workings in a wide range of changes in the inertial kinematic parameters of the air flow. Research methods. Based on the Boussinesq equation, the Fourier rule and the similarity theorem of complex systems, the analogy of vorticity dispersion and kinematic viscosity, a mathematical model of the movement of dust aerosols under hydro-vortex coagulation conditions is constructed. Some similarity criteria are obtained that ensure the identity of experimental studies and real aerological processes in mines, as well as criterion equations for calculating the coefficient of aerodynamic drag and the time of unsteady inertial motion. Results. Equations are obtained that make it possible to identify aerodynamic processes of aerosol motion under hydro-cyclonic dust suppression through the criteria of Reynolds, Euler and Archimedes, corresponding to the overStokes and Stokes flow regimes. The possibility of reducing the aerodynamic resistance to 20% during hydro-vortex coagulation has been confirmed, which makes it possible to increase the energy efficiency of dust suppression by up to 15% and to increase the turbulization coefficient by at least 20%, thereby reducing the likelihood of a hazardous concentration of dust aerosols. Application. The use of the proposed mathematical model will make it possible to better calculate local aerological processes in mine workings and, as a consequence, to increase the efficiency of turbulization and dust suppression process control at mining enterprises.

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20

Gieras, M., and R. Klemens. "Studies of dust explosion suppression by water sprays and extinguishing powders." Journal de Physique IV (Proceedings) 12, no. 7 (August 2002): 149–56. http://dx.doi.org/10.1051/jp4:20020278.

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21

Gan, Bo, Bei Li, Haipeng Jiang, Mingshu Bi, and Wei Gao. "Suppression of polymethyl methacrylate dust explosion by ultrafine water mist/additives." Journal of Hazardous Materials 351 (June 2018): 346–55. http://dx.doi.org/10.1016/j.jhazmat.2018.03.017.

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22

Jiang, Haipeng, Mingshu Bi, and Wei Gao. "Suppression mechanism of Al dust explosion by melamine polyphosphate and melamine cyanurate." Journal of Hazardous Materials 386 (March 2020): 121648. http://dx.doi.org/10.1016/j.jhazmat.2019.121648.

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23

Chen, Xianfeng, Hongming Zhang, Xi Chen, Xuanya Liu, Yi Niu, Ying Zhang, and Bihe Yuan. "Effect of dust explosion suppression by sodium bicarbonate with different granulometric distribution." Journal of Loss Prevention in the Process Industries 49 (September 2017): 905–11. http://dx.doi.org/10.1016/j.jlp.2017.02.012.

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24

Perry, K. A., and R. Q. Eades. "Explosion suppression comparisons between dry, wet and a newly developed hydrophobic rock dust." Transactions 340, no. 1 (January 1, 2016): 21–29. http://dx.doi.org/10.19150/trans.7323.

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25

Song, Yifan, and Qi Zhang. "The quantitative studies on gas explosion suppression by an inert rock dust deposit." Journal of Hazardous Materials 353 (July 2018): 62–69. http://dx.doi.org/10.1016/j.jhazmat.2018.03.052.

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26

Zhou, Jianhua, Haipeng Jiang, Yonghao Zhou, and Wei Gao. "Flame suppression of 100 nm PMMA dust explosion by KHCO3 with different particle size." Process Safety and Environmental Protection 132 (December 2019): 303–12. http://dx.doi.org/10.1016/j.psep.2019.10.027.

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27

Zhang, Yansong, Guangan Wu, Li Cai, Jie Zhang, Xiangrui Wei, and Xiang Wang. "Study on suppression of coal dust explosion by superfine NaHCO3/shell powder composite suppressant." Powder Technology 394 (December 2021): 35–43. http://dx.doi.org/10.1016/j.powtec.2021.08.037.

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28

Azam, Sikandar, and Devi Prasad Mishra. "Effects of particle size, dust concentration and dust-dispersion-air pressure on rock dust inertant requirement for coal dust explosion suppression in underground coal mines." Process Safety and Environmental Protection 126 (June 2019): 35–43. http://dx.doi.org/10.1016/j.psep.2019.03.030.

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Wang, Xiang, Xingwang Huang, Xinyan Zhang, Yansong Zhang, and Yaqing Zhang. "Numerical simulation of coal dust explosion suppression by inert particles in spherical confined storage space." Fuel 253 (October 2019): 1342–50. http://dx.doi.org/10.1016/j.fuel.2019.05.102.

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Wei, Xiangrui, Yansong Zhang, Guangan Wu, Xinyan Zhang, Yaqing Zhang, and Xiang Wang. "Study on explosion suppression of coal dust with different particle size by shell powder and NaHCO3." Fuel 306 (December 2021): 121709. http://dx.doi.org/10.1016/j.fuel.2021.121709.

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31

Shang, Sheng, Mingshu Bi, Tianjiao Zhang, Haipeng Jiang, Shulin Zhang, and Wei Gao. "Synthesis of green nanomaterial and discussion on its suppression performance and mechanism to aluminum dust explosion." Process Safety and Environmental Protection 151 (July 2021): 355–64. http://dx.doi.org/10.1016/j.psep.2021.05.031.

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32

You, Hao, Minggao Yu, Ligang Zheng, and An An. "Study on Suppression of the Coal Dust/Methane/Air Mixture Explosion in Experimental Tube by Water Mist." Procedia Engineering 26 (2011): 803–10. http://dx.doi.org/10.1016/j.proeng.2011.11.2240.

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Yang, Jie, Yuan Yu, Yunhao Li, Qingwu Zhang, Yifan Suo, Changxin Li, and Juncheng Jiang. "Experimental investigation of the suppression effects of ammonium polyphosphate on explosion characteristics of unsaturated polyester resin dust." Fire and Materials 44, no. 6 (August 5, 2020): 854–64. http://dx.doi.org/10.1002/fam.2885.

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Lesiak, Piotr, Damian Bąk, Daniel Małozięć, Marcin Grabarczyk, and Andrzej Kołaczkowski. "Evaluation of the Effectiveness of Active HRD Systems for Dust Explosion Suppression in a Technology Demonstrator System." Safety & Fire Technology 53, no. 1 (2019): 46–67. http://dx.doi.org/10.12845/sft.53.1.2019.3.

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35

Wang, Qiuhong, Zhongyi Shen, Juncheng Jiang, Qingfeng Wang, Chi-Min Shu, Yilin Sun, and Liwen Wang. "Suppression effects of ammonium dihydrogen phosphate dry powder and melamine pyrophosphate powder on an aluminium dust cloud explosion." Journal of Loss Prevention in the Process Industries 68 (November 2020): 104312. http://dx.doi.org/10.1016/j.jlp.2020.104312.

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Sherzod, Zairov, Khudaiberdiev Oibek, Normatova Muborak Zh., and Nomdorov Rustam. "Developing the methods of controlling dust and gas conditions when blasting high benches in deep pits." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 4 (June 25, 2020): 113–21. http://dx.doi.org/10.21440/0536-1028-2020-4-113-121.

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Research aim is to develop a method of reducing dust and gas emissions concentration at bulk explosions in open pits. Research relevance. When drilling and blasting in open pits, a huge amount of dust and toxic gaseous products is released, and the rate of their formation is affected by the blasting method, the range of explosives used, the method of drilling blast holes, type and sort of stemming, massif water content, rock properties, meteorological conditions, etc. It has been established that in an explosion of 1 kg of explosives, 15% from an average of 900 liters of various gases and gaseous products formed are toxic and dangerous to humans and the environment. To prevent dust and gas emissions, various types of tamping are currently used, which affect not only emissions reduction, but also the efficiency and safety of blasting contributing to the fullest use of explosion energy and increasing the exposure time of the products of explosive 120 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 4. 2020 ISSN 0536-1028 transformation. Despite the significant amount of research and successes achieved in this direction, for deep pits it is necessary to determine the rational parameters of stemming in borehole explosive charges, reduce the formation of toxic gases released in bulk explosions, develop a method of producing an absorption solution capable of neutralizing toxic compounds after an explosion, and develop an effective way to reduce dust and gas emissions in bulk explosions. Research methodology. To solve this problem, integrated research methods were used, including theoretical generalizations and experimental studies in laboratory, testing ground and industrial conditions, methods of mathematical modeling of stemming parameters in borehole explosive charges, methods of mathematical programming using modern computer equipment, as well as methods of mathematical statistics and correlation analysis of research results. Results. Detonation products pressure change in the well has been determined taking into account motion processes of sand and absorbing mixture stemming of various lengths. It has been established that when using stemming made of absorbing mixture, detonation products pressure and escape time are higher compared to sand stemming. The effective stemming length in borehole explosive charges has been established depending on well pressure fall time and stemming length in different sections of the well. Mathematical modeling of stemming parameters in the explosion of borehole explosive charges established the change in pressure in the blast chamber as a function of stemming time and length during its escape from the well, as well as the of stemming escape duration and expiration of detonation products during emulsion explosive blast depending on stemming length. A method has been developed of dust and gas atmospheric pollution parameters determination during the production of bulk explosions in deep pits, An absorption mixture has been developed, which makes it possible to intensify the process of dust deposition above the explosion site and reduce pollution of the surrounding quarry, which favorably affects the environmental situation in the mining region. A method has been developed to reduce dust and gas emissions during blasting operations in open pits, which allows to reduce the concentration of dust and gas clouds formed. Scope of the results. A method of suppressing dust and gas emissions has been introduced at the Muruntau open pit of the Navoi Mining and Metallurgical Combinat. As a result, the process of dust deposition above the explosion site has been intensified, pollution of the surrounding open pit area has been reduced, the concentration of nitrogen dioxide has been reduced by 30.1%, carbon monoxide by 28.6% and sulfur dioxide by 20.5%. The results can be used in quarries where rock crushing is carried out using a blasting method

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37

Klemens, Rudolf, Bernard Szatan, Marian Gieras, Piotr Wolański, Andrzej Maranda, Jerzy Nowaczewski, and Józef Paszula. "Suppression of dust explosions by means of different explosive charges." Journal of Loss Prevention in the Process Industries 13, no. 3-5 (May 2000): 265–75. http://dx.doi.org/10.1016/s0950-4230(99)00050-9.

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38

Tverda, O., O. Kofanova, O. Kofanov, K. Tkachuk, O. Polukarov, and V. Pobigaylo. "Gas-Neutralizing and Dust-Suppressing Stemming of Borehole Charges for Increasing the Environmental Safety of Explosion." Latvian Journal of Physics and Technical Sciences 58, no. 4 (August 1, 2021): 15–27. http://dx.doi.org/10.2478/lpts-2021-0030.

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Abstract The problem of environmental pollution during the explosive destruction of rocks in order to extract minerals is solved in the article. Two types of borehole charge stemming design have been developed, which, in addition to the function of locking the products of the explosion, allow completely neutralizing harmful gases. The first type is the stemming design, which includes the two-stage purification of harmful gases, formed during the explosive destruction of rocks, and is based on chemisorption of gases by quicklime or production waste and physicochemical sorption (adsorption) by zeolites. Such stemming can provide complete chemical neutralization of NO2 and CO2, as well as neutralization of CO by zeolites, during the explosion. The second type is stemming design, which includes chemisorption of gases by slaked lime. This type of stemming has a number of advantages over the previous one. It can not only provide complete chemical neutralization of NO2, CO2 and CO, but also allows abandoning zeolites, which significantly reduces the cost of its formation to obtain the effect of “irrigation” of the dust and gas cloud, which reduces the concentration of dust in the air after the explosion to provide a higher degree of conversion. The paper determines quantitative and qualitative characteristics of the adsorbent composition of the two types of stemming depending on the type of explosive, the amount and type of harmful gases formed during explosion, and the parameters of the borehole.

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39

Звягинцева, Алла, Alla Zvyaginceva, Светлана Сазонова, Svetlana Sazonova, В. Кульнева, and V. Kul'neva. "MODELING OF PROCESSES AND DEVELOPMENT OF MEASURES TO REDUCE DUST AND GAS EMISSIONS AT THE QUARRIES OF MINING AND PROCESSING PLANT." Modeling of systems and processes 12, no. 2 (October 24, 2019): 26–32. http://dx.doi.org/10.12737/article_5db1e3e603a636.30835581.

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Existing measures for the suppression of dust and gas emissions during mass explosions at the quarry of a mining and processing plant were investigated. Measures have been developed to reduce dust and gas emissions, taking into account the analysis of existing measures to suppress dust and gas emissions from mass explosions in the open pit of the mining and processing plant of Lebedinsky GOK. The studies of surface active substances on the wettability of dust particles. In order to improve working conditions, it was proposed to reduce dust and gas emissions by suppressing them at the source of education, using the method of wetting and sticking of dust particles. The proposed engineering - technical solution can be used to reduce dust and gas emissions during massive explosions in the quarries of various mining and processing enterprises. The developed method is proposed to be used to ensure environmental safety and improve working conditions in industries with high dustiness by increasing the efficiency of dust collection.

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Zhang, Tianjiao, Mingshu Bi, Haipeng Jiang, and Wei Gao. "Suppression of aluminum dust explosions by expandable graphite." Powder Technology 366 (April 2020): 52–62. http://dx.doi.org/10.1016/j.powtec.2020.02.053.

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Welford, G. B., S. Ivatt, and G. Dennison. "Dust explosions at elevated pressures and their suppression." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 213, no. 6 (September 1999): 435–46. http://dx.doi.org/10.1243/0957650991537680.

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Dastidar, Ashok G., Paul R. Amyotte, and Michael J. Pegg. "Factors influencing the suppression of coal dust explosions." Fuel 76, no. 7 (May 1997): 663–70. http://dx.doi.org/10.1016/s0016-2361(97)00039-2.

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Zhou, Jianhua, Bei Li, Daqing Ma, Haipeng Jiang, Bo Gan, Mingshu Bi, and Wei Gao. "Suppression of nano-polymethyl methacrylate dust explosions by ABC powder." Process Safety and Environmental Protection 122 (February 2019): 144–52. http://dx.doi.org/10.1016/j.psep.2018.11.023.

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Oleszczak, P., and Rudolf Klemens. "SUPPRESSION OF DUST-AIR MIXTURES EXPLOSIONS BY MEANS OF WATER SPRAY." International Journal of Energetic Materials and Chemical Propulsion 6, no. 5 (2007): 589–607. http://dx.doi.org/10.1615/intjenergeticmaterialschemprop.v6.i5.40.

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45

Liu, Qingming, Yongli Hu, Chunhua Bai, and Mo Chen. "Methane/coal dust/air explosions and their suppression by solid particle suppressing agents in a large-scale experimental tube." Journal of Loss Prevention in the Process Industries 26, no. 2 (March 2013): 310–16. http://dx.doi.org/10.1016/j.jlp.2011.05.004.

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Moore, P. E., P. L. Cooke, and Norbert Gibson. "Report on a Research project on the Suppression of Metal Dust Explosions." Journal of Loss Prevention in the Process Industries 2, no. 4 (January 1989): 242–43. http://dx.doi.org/10.1016/0950-4230(89)80044-0.

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47

Klemens, Rudolf, Marian Gieras, and Michal Kaluzny. "Dynamics of dust explosions suppression by means of extinguishing powder in various industrial conditions." Journal of Loss Prevention in the Process Industries 20, no. 4-6 (July 2007): 664–74. http://dx.doi.org/10.1016/j.jlp.2007.04.021.

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Jiang, Haipeng, Mingshu Bi, Lei Huang, Yonghao Zhou, and Wei Gao. "Suppression mechanism of ultrafine water mist containing phosphorus compounds in methane/coal dust explosions." Energy 239 (January 2022): 121987. http://dx.doi.org/10.1016/j.energy.2021.121987.

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Krasnyansky, Mikhail. "Prevention and suppression of explosions in gas-air and dust-air mixtures using powder aerosol-inhibitor." Journal of Loss Prevention in the Process Industries 19, no. 6 (November 2006): 729–35. http://dx.doi.org/10.1016/j.jlp.2006.05.004.

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Dong, Gang, Baochun Fan, Bo Xie, and Jingfang Ye. "Experimental investigation and numerical validation of explosion suppression by inert particles in large-scale duct." Proceedings of the Combustion Institute 30, no. 2 (January 2005): 2361–68. http://dx.doi.org/10.1016/j.proci.2004.07.046.

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