Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry
In view of the problems of traditional spraying technology, such as complex processes, high costs, large dust amounts, and poor air leakage effects, a new composite spraying slurry is proposed in this paper, which takes clay as the main base material and uses water pressure and wind pressure to ensu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/10/1182 |
| _version_ | 1797471091593052160 |
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| author | Changan Liu Sihua Shao Xueyou Su Zhongru Zhang Zhimeng Sun Biao Zhang |
| author_facet | Changan Liu Sihua Shao Xueyou Su Zhongru Zhang Zhimeng Sun Biao Zhang |
| author_sort | Changan Liu |
| collection | DOAJ |
| description | In view of the problems of traditional spraying technology, such as complex processes, high costs, large dust amounts, and poor air leakage effects, a new composite spraying slurry is proposed in this paper, which takes clay as the main base material and uses water pressure and wind pressure to ensure intrinsic safety. Firstly, the airtightness, bending resistance, and viscosity of the spraying material were measured in the laboratory; secondly, the gas–liquid–solid three-phase flow process involved in the spraying process was simulated by using the CFD-DPM method, adopting the Eulerian two-fluid model for continuous gas–water two-phases and the discrete phase DPM model for dust generation, and the transport, diffusion, and full space-time distribution characteristics of dust generation were studied. The research shows that: (1) the new composite slurry spraying material made of clay as the main material is made by adding a small proportion of cement and engineering fiber to increase the toughness of the material, and finally, determining the mass ratio of the composite material as follows: clay: cement: additive: engineering fiber = 84:14:1.85:0.15. It has good sealing and bending resistance and good adhesion; (2) the water phase distribution under the action of spray determines the distribution of solid-phase dust, and the distribution area of dust is similar to that of the water phase; (3) under the action of spray, the area at the bottom of the roadway is covered by dust flow, and the dust in this area is obviously stratified. The particle size of the dust gradually decreases from bottom to top. The large particle size dust is deposited at the bottom, while the small particle size dust is suspended at a certain height, and the diffusion area gradually increases; (4) the effect of spray angle on dust is mainly manifested in the initial dust flow shape and dust diffusion time. The larger the spray angle, the faster the diffusion; (5) when the water velocity at the nozzle outlet is large, the dust concentration is low in the whole area, but in areas higher than 1.5 m, the PM2.5 concentration also increases with the increase in water flow. The dust suppression effect of larger a water flow is mainly reflected in the bottom area, and the disturbed surrounding airflow can make PM2.5 diffuse to higher areas. |
| first_indexed | 2024-03-09T19:44:38Z |
| format | Article |
| id | doaj.art-a91a7c5fe41141669c72748951593391 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T19:44:38Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-a91a7c5fe41141669c727489515933912023-11-24T01:28:21ZengMDPI AGMinerals2075-163X2022-09-011210118210.3390/min12101182Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying SlurryChangan Liu0Sihua Shao1Xueyou Su2Zhongru Zhang3Zhimeng Sun4Biao Zhang5Xuzhou CUMT Backfill Technology Co., Ltd., Xuzhou 221008, ChinaCoal Mine of Jingyuan Coal Power Co., Ltd., Baiyin 730699, ChinaHonghui No. 1 Coal Mine of Jingyuan Coal Power Co., Ltd., Baiyin 730699, ChinaHonghui No. 1 Coal Mine of Jingyuan Coal Power Co., Ltd., Baiyin 730699, ChinaHonghui No. 1 Coal Mine of Jingyuan Coal Power Co., Ltd., Baiyin 730699, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaIn view of the problems of traditional spraying technology, such as complex processes, high costs, large dust amounts, and poor air leakage effects, a new composite spraying slurry is proposed in this paper, which takes clay as the main base material and uses water pressure and wind pressure to ensure intrinsic safety. Firstly, the airtightness, bending resistance, and viscosity of the spraying material were measured in the laboratory; secondly, the gas–liquid–solid three-phase flow process involved in the spraying process was simulated by using the CFD-DPM method, adopting the Eulerian two-fluid model for continuous gas–water two-phases and the discrete phase DPM model for dust generation, and the transport, diffusion, and full space-time distribution characteristics of dust generation were studied. The research shows that: (1) the new composite slurry spraying material made of clay as the main material is made by adding a small proportion of cement and engineering fiber to increase the toughness of the material, and finally, determining the mass ratio of the composite material as follows: clay: cement: additive: engineering fiber = 84:14:1.85:0.15. It has good sealing and bending resistance and good adhesion; (2) the water phase distribution under the action of spray determines the distribution of solid-phase dust, and the distribution area of dust is similar to that of the water phase; (3) under the action of spray, the area at the bottom of the roadway is covered by dust flow, and the dust in this area is obviously stratified. The particle size of the dust gradually decreases from bottom to top. The large particle size dust is deposited at the bottom, while the small particle size dust is suspended at a certain height, and the diffusion area gradually increases; (4) the effect of spray angle on dust is mainly manifested in the initial dust flow shape and dust diffusion time. The larger the spray angle, the faster the diffusion; (5) when the water velocity at the nozzle outlet is large, the dust concentration is low in the whole area, but in areas higher than 1.5 m, the PM2.5 concentration also increases with the increase in water flow. The dust suppression effect of larger a water flow is mainly reflected in the bottom area, and the disturbed surrounding airflow can make PM2.5 diffuse to higher areas.https://www.mdpi.com/2075-163X/12/10/1182composite slurryspraying technologytemporal and spatial distribution of dustdust migration characteristicsEulerian two-fluid model |
| spellingShingle | Changan Liu Sihua Shao Xueyou Su Zhongru Zhang Zhimeng Sun Biao Zhang Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry Minerals composite slurry spraying technology temporal and spatial distribution of dust dust migration characteristics Eulerian two-fluid model |
| title | Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry |
| title_full | Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry |
| title_fullStr | Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry |
| title_full_unstemmed | Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry |
| title_short | Study on Temporal and Spatial Distribution and Transport Characteristics of Dust in New Composite Spraying Slurry |
| title_sort | study on temporal and spatial distribution and transport characteristics of dust in new composite spraying slurry |
| topic | composite slurry spraying technology temporal and spatial distribution of dust dust migration characteristics Eulerian two-fluid model |
| url | https://www.mdpi.com/2075-163X/12/10/1182 |
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