Development of a novel wind-assisted centralized spraying dedusting device for dust suppression in a fully mechanized mining face

AbstractAiming at addressing serious pollution in the No. 30106 fully mechanized coal mining face of Shiquan Coal Mine during coal cutting process, the spraying device between hydraulic supports was improved through the combination of experimental analysis, numerical simulation, and field measurement, and a novel wind-assisted centralized spraying dedusting device was developed. The newly developed device could make the formed spraying field more concentrated on the dust-producing source around the coal shearer’s drum, and thus significantly enhanced the spraying performance. According to numerical simulation results, the spraying performance reached the optimum at a hydraulic pressure of 8 MPa for the spraying device and an air pressure of 1 MPa for the pneumatic motor; under these optimal conditions, the droplet concentration in the spraying field around the coal cutter drum was as high as 24.85 g/m3, and the formed high-concentration spraying field could basically cover the whole section in the spraying field from coal wall to the support pillar. Field measured results revealed that, at a hydraulic pressure of 8 MPa and an air pressure of 1 MPa, the dust suppression rate around coal cutter driver reached up to 87.96%, suggesting that the developed wind-assisted centralized spraying dedusting device had remarkable dust suppression performance and could effectively improve the operating environment in the fully mechanized mining face. Graphical AbstractIn this paper, we have designed a novel wind-assisted centralized spraying dedusting device and studied the optimal spray parameters. Firstly, the nozzles were selected according to the multi-factor experimental platform for measuring the spraying field’s atomization characteristics. Secondly, we had a numerical simulation of the fully mechanized mining face. And the third, we tested the effect of dust removal.

[1]  Deming Wang,et al.  The influence of forced ventilation airflow on water spray for dust suppression on heading face in underground coal mine , 2017 .

[2]  W. Nie,et al.  The diffusion of dust in a fully-mechanized mining face with a mining height of 7 m and the application of wet dust-collecting nets , 2018, Journal of Cleaner Production.

[3]  A. Bernatik,et al.  The influence of air flow on maximum explosion characteristics of dust–air mixtures , 2013 .

[4]  Li Zhao,et al.  The mechanism and relief method of the coal seam water blocking effect (WBE) based on the surfactants , 2018 .

[5]  Yanyun Zhao,et al.  Effects of different catalysts on the structure and properties of polyurethane/water glass grouting materials , 2018 .

[6]  L. Audouin,et al.  Numerical method for determining water droplets size distributions of spray nozzles using a two-zone model , 2017 .

[7]  W. Nie,et al.  Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment , 2015, Journal of analytical methods in chemistry.

[8]  Weimin Cheng,et al.  Development of cement dust suppression technology during shotcrete in mine of China-A review , 2018, Journal of Loss Prevention in the Process Industries.

[9]  Bifeng Yin,et al.  Numerical research on micro diesel spray characteristics under ultra-high injection pressure by Large Eddy Simulation (LES) , 2017 .

[10]  Ni Guanhua,et al.  Improving the permeability of coal seam with pulsating hydraulic fracturing technique: A case study in Changping coal mine, China , 2018, Process Safety and Environmental Protection.

[11]  Weimin Cheng,et al.  Investigating and optimizing the mix proportion of pumping wet-mix shotcrete with polypropylene fiber , 2017 .

[12]  Micky Kelager.  Lagrangian Fluid Dynamics Using Smoothed Particle Hydrodynamics , 2006 .

[13]  R. V. Ramani,et al.  Experimental studies on dust dispersion in mine airways , 1987 .

[14]  Gang Wang,et al.  Preparation and characteristics of a multifunctional dust suppressant with agglomeration and wettability performance used in coal mine , 2018 .

[15]  Gang Wang,et al.  Height of the mining-induced fractured zone above a coal face , 2017 .

[16]  P. Raynor,et al.  Effects of Spray Surfactant and Particle Charge on Respirable Coal Dust Capture , 2017, Safety and health at work.

[17]  W. Nie,et al.  The effects of the installation position of a multi-radial swirling air-curtain generator on dust diffusion and pollution rules in a fully-mechanized excavation face: A case study , 2018 .

[18]  Luo Li-ping,et al.  Numerical Modeling on Fluid-Solid Coupling for the Waterproof Coal Pillar Design , 2009 .

[19]  M. M. Konorev,et al.  Present-day and promising ventilation and dust-and-gas suppression systems at open pit mines , 2012, Journal of Mining Science.

[20]  W. Nie,et al.  The development and testing of a novel external-spraying injection dedusting device for the heading machine in a fully-mechanized excavation face , 2017 .

[21]  Zhongwei Wang,et al.  CFD modelling of ventilation and dust flow behaviour above an underground bin and the design of an innovative dust mitigation system , 2014 .

[22]  W. Nie,et al.  Research on multi-radial swirling flow for optimal control of dust dispersion and pollution at a fully mechanized tunnelling face , 2018, Tunnelling and Underground Space Technology.

[23]  Luo We.  Numerical simulation study of airflow characteristics and dust concentration on mechanized heading face , 2013 .

[24]  Jiayuan Wang,et al.  Effects of turbulent airflow from coal cutting on pollution characteristics of coal dust in fully-mechanized mining face: A case study , 2018, Journal of Cleaner Production.

[25]  Dariusz Prostański,et al.  Use of Air-and-Water Spraying Systems for Improving Dust Control in Mines , 2013, Journal of Sustainable Mining.

[26]  Ma Xiao,et al.  A novel spraying/negative-pressure secondary dust suppression device used in fully mechanized mining face: A case study , 2016 .

[27]  W. Nie,et al.  A synthesis and performance evaluation of a highly efficient ecological dust depressor based on the sodium lignosulfonate–acrylic acid graft copolymer , 2018, RSC advances.

[28]  W. Nie,et al.  The effects of ventilation parameters on the migration behaviors of head-on dusts in the heading face , 2017 .

[29]  Gang Wang,et al.  The diffusion behavior law of respirable dust at fully mechanized caving face in coal mine: CFD numerical simulation and engineering application , 2017 .

[30]  Wen Nie,et al.  Pattern characterization concerning spatial and temporal evolution of dust pollution associated with two typical ventilation methods at fully mechanized excavation faces in rock tunnels , 2018, Powder Technology.

[31]  Deming Wang,et al.  Experimental investigation of the performance of a novel foam generator for dust suppression in underground coal mines , 2014 .

[32]  Zuo Qian-ming,et al.  Study of dust suppression by atomized water from high-pressure sprays in mines , 2011 .

[33]  W. Nie,et al.  The diffusion and pollution mechanisms of airborne dusts in fully-mechanized excavation face at mesoscopic scale based on CFD-DEM , 2016 .

[34]  W. Höflinger,et al.  Evaluation of primary and secondary fugitive dust suppression methods using enclosed water spraying systems at bulk solids handling , 2011 .

[35]  Zuo Qianmin.  Research on Nozzle Arrangement Optimization of Hydraulic Support in Fully Mechanized Caving Face , 2013 .

[36]  Yanyun Zhao,et al.  Performance optimization of one-component polyurethane healing agent for self-healing concrete , 2018 .

[37]  Huitian Peng,et al.  An investigation of the nozzle’s atomization dust suppression rules in a fully-mechanized excavation face based on the airflow-droplet-dust three-phase coupling model , 2018 .

[38]  W. Nie,et al.  Simulation experiments on the controllability of dust diffusion by means of multi-radial vortex airflow , 2018 .

[39]  Gang Wang,et al.  Deformation and gas flow characteristics of coal-like materials under triaxial stress conditions , 2017 .

[40]  W. Nie,et al.  Solidifying dust suppressant based on modified chitosan and experimental study on its dust suppression performance , 2018 .

[41]  Yanyun Zhao,et al.  An intelligent gel designed to control the spontaneous combustion of coal: Fire prevention and extinguishing properties , 2017 .

[42]  Liu Jiang-yue,et al.  Numerical simulation of dust migration and study on dust removal modes with the forced ventilation shunt in a fully mechanized workface , 2011 .

[43]  Andrea Malizia,et al.  Non-invasive assessment of dust concentration and relative dustiness in a dust cloud mobilized by a controlled air inlet inside STARDUST-U facility , 2017, Reliab. Eng. Syst. Saf..

[44]  W. Nie,et al.  Diffusion and pollution of multi-source dusts in a fully mechanized coal face , 2018 .

[45]  Meng Gao,et al.  Parameter Optimization and Numerical Simulation of Dust-Collecting and Dedusting System with Air Curtain in Heading Face , 2011 .

[46]  Gang Zhou,et al.  Research on Eddy Air-Curtain Dust Controlled Flow Field in Hard Rock Mechanized Driving Face , 2013, J. Networks.

[47]  Liu Qiang,et al.  The effects of the pressure outlet's position on the diffusion and pollution of dust in tunnel using a shield tunneling machine , 2018, Energy and Buildings.

[48]  D. Gidaspow.  Multiphase Flow and Fluidization: Continuum and Kinetic Theory Descriptions , 1994 .

[49]  Huitian Peng,et al.  Micro-scale pollution mechanism of dust diffusion in a blasting driving face based on CFD-DEM coupled model , 2018, Environmental Science and Pollution Research.

[50]  Wen Nie,et al.  Research and practice on fluctuation water injection technology at low permeability coal seam , 2012 .

[51]  Deming Wang,et al.  Modeling the Influence of Dust-Removing Extraction Fan’s Parameters on the Dust Control Effects in the Tunnel , 2016 .

[52]  Chen Lian-jun.  Optimal Design of Dust-settling Device by Water Spraying for Powered Support in Fully Mechanized Caving Face Annually Producing 6 Million Tons of Coal , 2009 .

[53]  Weimin Cheng,et al.  Mechanisms of dust diffuse pollution under forced-exhaust ventilation in fully-mechanized excavation faces by CFD-DEM , 2017 .

[54]  Deming Wang,et al.  A new design of foam spray nozzle used for precise dust control in underground coal mines , 2016 .

[55]  Wiwut Tanthapanichakoon,et al.  Deterministic model of open-space dust removal system using water spray nozzle: Effects of polydispersity of water droplet and dust particle , 2011 .

[56]  W. Nie,et al.  Preparation and experimental dust suppression performance characterization of a novel guar gum-modification-based environmentally-friendly degradable dust suppressant , 2018, Powder Technology.