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Xiu Z, Cai P, Chen D, Nie W. Numerical simulation of dust control technology for longwall working face with convective air curtain. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:101829-101840. [PMID: 37658168 DOI: 10.1007/s11356-023-29563-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 08/24/2023] [Indexed: 09/03/2023]
Abstract
A convection-type air curtain dust control system and method were proposed to effectively control the high dust concentrations generated during the operation of coal miners and hydraulic supports and to reduce the dust concentration in the entire working space of longwall work surfaces, and the effectiveness of air curtain dust control during single process operation was investigated through numerical simulation. The results showed that when the miner was working alone, there was a significant difference in the concentration distribution inside and outside the dust-proof air curtain, with significantly lower dust concentrations in the area where the miner drivers were operating compared to both sides, with an average dust mass concentration of around 420 mg/m3. Dust concentrations increased to about 700 mg/m3, but large amounts of dust were prevented from diffusing downwind. This indicates that the dust reduction effect is more pronounced after the equipment is opened, which can improve the working environment and reduce the probability of dust combustion and explosion accidents.
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Affiliation(s)
- Zihao Xiu
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
| | - Peng Cai
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China
| | - Dawei Chen
- College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, 266590, China
| | - Wen Nie
- College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
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Yi S, Nie W, Zhang S, Peng H, Xu C, Ma Q, Guo C, Cha X, Jiang C. Numerical simulation analysis of a combined wind-fog dust removal device in return air roadways based on an orthogonal test. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2022.117890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Modeling and experimental verification of a novel vacuum dust collector for cleaning photovoltaic panels. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.11.058] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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A Mathematical Model for Predicting the Sauter Mean Diameter of Liquid-Medium Ultrasonic Atomizing Nozzle Based on Orthogonal Design. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app112411628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
As a new type of atomizing nozzle with superior atomizing performance, the liquid-medium ultrasonic atomization nozzle has been widely applied in the field of spray dust reduction. In this study, in order to establish a mathematical model for predicting the Sauter mean diameter (SMD) of such nozzles, the interaction between the SMD of the nozzle and the three influencing factors, i.e., air pressure, water pressure, and outlet diameter were investigated based on the custom-designed spraying experiment platform and orthogonal design methods. Through range analysis, it was obtained that the three parameters affecting the SMD of the nozzle are in the order of air pressure > water pressure > outlet diameter. On this basis, using the multivariate nonlinear regression method, the mathematical model for predicting the SMD of the nozzle was constructed. Comparison of the experimental results with the predicted values of the SMD of the nozzle by the multivariate nonlinear regression mathematical model, showed strong similarity with an average relative error of only about 5%. Therefore, the established mathematical model in this paper can be used to predict and calculate the droplet size for liquid-medium ultrasonic atomizing nozzles.
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Xun M, Xie J, Xie J, Sun Q, Lu S, Wang G. Study on the effect of acid-heat coupling on the damage characteristics of coal pore-fissure structure. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.07.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Jiang B, Sun Q, Ni G. Study on the Wettability of a Composite Solution Based on Surface Structures of Coal. ACS OMEGA 2020; 5:28341-28350. [PMID: 33163817 PMCID: PMC7643304 DOI: 10.1021/acsomega.0c04345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2020] [Accepted: 10/15/2020] [Indexed: 06/02/2023]
Abstract
In order to research the influence of composite surfactant solutions on the wetting ability of coal, the wettability parameters, pore structure parameters, and surface microscopic morphology were determined in this study. The results show that the wettability of the surfactant can be improved by adding NaCl. As the concentration of NaCl increased, the spreading coefficient of the NaCl-SDS composite solution increases; the spreading coefficient increased from -10.838 to -3.7624 mN/m. The surface free energy decreased from -2.031 to 3.670 J/mol × 103, and the adhesion work decreased from 113.802 to 55.058 mJ/m2. In terms of the pore structure and surface morphology of coal, the pore size will affect the wettability of coal. The contact angle reduces with pore size increase (R 2 = 0.955). The surface pores of coal treated with the NaCl-SDS composite solution increase and the fracture connectivity is improved, which facilitated the solution to penetrate coal for wetting. The results of this paper have great practical significance for mining at the face to reduce coal dust pollution.
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Affiliation(s)
- Bingyou Jiang
- Key Laboratory of
Industrial Dust Prevention and Control & Occupational Health and
Safety, Ministry of Education, Anhui University
of Science and Technology, Huainan 232001, Anhui, China
- State Key
Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
| | - Qian Sun
- College of Safety and Environmental
Engineering, Shandong University of Science
and Technology, Qingdao 266590, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-founded
by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
| | - Guanhua Ni
- College of Safety and Environmental
Engineering, Shandong University of Science
and Technology, Qingdao 266590, China
- State Key Laboratory of Mining Disaster Prevention and Control Co-founded
by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, China
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Ma Q, Nie W, Yang S, Xu C, Peng H, Liu Z, Guo C, Cai X. Effect of spraying on coal dust diffusion in a coal mine based on a numerical simulation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 264:114717. [PMID: 32417573 DOI: 10.1016/j.envpol.2020.114717] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/26/2020] [Accepted: 04/30/2020] [Indexed: 05/14/2023]
Abstract
Aimed at effectively controlling coal dust pollution in the mining face of a coal mine, this study first conducted a theoretical analysis and then combined a spraying experiment and a numerical simulation to perform an in-depth examination of the atomizing characteristics and dust suppression performance of a coal cutter external spraying device. Based on the experimental spraying results, the optimal nozzle was determined to be a pressure round-mouth nozzle with an X-shaped core. The characteristics of the spray fields from nozzles of different calibers (1.6, 2.0 and 2.4 mm) at different spraying pressures (2, 4, 6 and 8 MPa) were then analyzed. It was found that the droplet concentration in the spray field increased with increasing spraying pressure and nozzle caliber. The droplet diameter was mainly dependent on the spraying pressure and varied more slowly with increased spraying pressure. At a spraying pressure of 8 MPa, the spray field formed could achieve effective dust suppression; specifically, the droplet concentration in the spray field was mostly more than 15 g/m3, and the droplet size was mainly distributed in the range of 30-100 μm. When using a 2.4 mm caliber nozzle, the dust concentration measured around the coal cutter operator was reduced to 87.21 mg/m3 under a spraying pressure of 8 MPa, suggesting adequate dust suppression.
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Affiliation(s)
- Qingxin Ma
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Wen Nie
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Shibo Yang
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Changwei Xu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Huitian Peng
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Zhiqiang Liu
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Cheng Guo
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
| | - Xiaojiao Cai
- College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China; State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590, China.
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Study on the air curtain dust control technology with a dust purifying fan for fully mechanized mining face. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.06.082] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Xu C, Nie W, Yang S, Peng H, Liu Z, Ma Q, Guo C, Liu Q. Numerical simulation of the multi-index orthogonal experiments on the spray dust-settling devices. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Yin S, Nie W, Guo L, Liu Q, Hua Y, Cai X, Cheng L, Yang B, Zhou W. CFD simulations of air curtain dust removal effect by ventilation parameters during tunneling. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.04.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Guanhua N, Kai D, Shang L, Qian S, Dongmei H, Ning W, Yanying C. Development and performance testing of the new sealing material for gas drainage drilling in coal mine. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.12.031] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zhang H, Nie W, Yan J, Bao Q, Wang H, Jin H, Peng H, Chen D, Liu Z, Liu Q. Preparation and performance study of a novel polymeric spraying dust suppression agent with enhanced wetting and coagulation properties for coal mine. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.10.082] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Li Y, Wang P, Liu R, Jiang Y, Han H. Determination of the optimal axial-to-radial flow ratio of the wall-mounted swirling ventilation in fully mechanized excavation face. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.10.067] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Research on mine dust suppression by spraying: Development of an air-assisted PM10 control device based on CFD technology. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.08.006] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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