WEBDec 21, 2022 · Pulverized coal (PC) blending with ironbearing dust (IBD) injection technology in blast furnace (BF) ironmaking process was proposed to valorize the IBD.
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WEBApr 1, 2024 · To prepare the experimental coal dust, the samples were initially crushed using an aseptic crusher and subsequently sieved through a 28mesh sieve. Detailed results of the industrial analysis conducted on the coal samples are presented in Table 1. The g sample of coal dust was combined with 100 mL of a nutrient solution .
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WEBAug 1, 2022 · To further enhance the impact of water injection and dust reduction in the deep mining process of the coal mine, an efficient dust suppressant for water injection was synthesized by coupling a ...
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WEBAug 9, 2017 · When a coal seam is injected with pressurized water, it can be opened by the water pressure seepage, and then channels will be formed and saturated with water in the seam. Cheng et al. (2012, 2013) investigated the microscopic process of water injection in coal seams, and determined the main influencing factors of coal seam water injection.
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WEBAug 14, 2020 · However, in the process of coal formation, primary particles and . Expand. 2. 1 Excerpt; Save. ... is of great significance for improving the performance of both onsite coal seam water injection and dust . Expand. 1 Excerpt; Save. Experimental study on the spontaneous imbibition characteristics of accumulated coal grains.
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WEBDec 29, 2022 · First, before coal mining, a water injection process is used to improve the wettability of coal or reasonable mining technology is adopted to reduce the possibility of coal dust production. Second, specific dust control technology is used during mining to control the dust source so that the dust exists in a specific space and position and ...
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WEBSteps in the process are (1) mining of the coal from nearsurface or deep mines, (2) transporting crushed coal several centimeters in size to the power station, (3) pulverizing the coal to a powder predominantly less than 100 μ m in size, (4) pneumatically transporting this coal dust with combustion air into a large combustion chamber with ...
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WEBMar 1, 2019 · Dust pollution generated during the working process of a screening workshop in a coal washing plant seriously threatens the occupational health of workers. To improve the working environment for workers, we investigated the effects of various airflow parameters on the diffusion of dust particles and pollutants.
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WEBNov 10, 2011 · As flowrate increases, the entrainment of coal dust into the pipe increases due to increased venturi effect. This is shown in Fig. 5, where the mass of dust injected (grams per minute) is plotted as a function of the airflow rate in gpm. The variation of the coal dust injection rate is nonlinear for air flowrates up to gpm. After this ...
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WEBAug 1, 2021 · Wang et al. focused on the wettability of respirable coal dust and the influence of functional groups of respirable coal dust on its wettability [36], [37]. Si et al. have proposed an improved effective diffusion system, which provides a reference for improving the wetting effect of coal seam water injection [38].
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WEBSep 26, 2018 · Recent research on liquid spray additives for coal dust suppression has been focused on enhancing the wetting ability while neglecting the mitigation of dust reentrainment issue. ... Experimental synthesis and performance comparison analysis of highefficiency wetting enhancers for coal seam water injection. Process Safety and .
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WEBAug 15, 2022 · In the process of coal seam water injection and spray dustfall, the dust fall rate of total dust and dust is approximately 30%40% without adding any surfactants. In this study, to compare and analyze the appliion effect of the developed new materials, we compared the strong permeability and moisturizing material (SACB) with the .
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WEBAs shown in Fig. 1, it is the device used in this experiment to test the ignition process and explosion propagation of industrial dust, also known as the Hartmann tube internationally, it is drawn using the 3D modeling software experimental system mainly consists of transparent glass tube, ignition electrode, diffuser, air compressor, and .
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WEBMay 1, 2020 · 5, 6 In addition, coal seam water injection can increase the water content of the coal mass, change the nature of the coal mass, and reduce the dust concentration during the mining process ...
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WEBApr 1, 2012 · Highpressure water injection in coal seams has been widely adopted in coal exploitation due to the advantages of controlling and preventing gas disasters and dust (Aguado and Nicieza, 2007; Cheng ...
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WEBJun 1, 2014 · The combustion efficiency of pulverized coal particles in a blast furnace depends strongly on the particle flow behaviors and the shape of the main combustion zone,, the raceway shape.
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WEBMar 11, 2021 · In order to explore the microwetting process of coal dust, this paper uses molecular dynamics simulation to study the microwetting process of coal dust in different simulation conditions. ... Coal seam water injection is a fundamental and efficient method to prevent and control dust from its source (Cheng et al. 2012). In terms of mining and ...
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WEBFeb 23, 2023 · The wetting behavior of droplets during impacting coal surface widely exists in the dust control process. Understanding the effect of surfactants on the diffusion of water droplets on coal surface ...
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WEBJun 1, 2018 · The coal sample used during this study was obtained from a steel work plant of the PanZhiHua Iron and Steel Group in Sichuan, China, and is being applied in the pulverized coal injection (PCI) process in a BF. The coal samples are a blended coal with a blend mass ratio of anthracite to bituminous coal of 8:2.
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WEBDec 17, 2019 · The effect of dust reduction applied to onsite coalbed water injection is significant, with the average dust reduction rates during coal cutting and support moving being % and % ...
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WEBJan 30, 2021 · Four types of meager and meagerlean coal and one type of highquality anthracite were selected based on the safety requirements for blast furnace coal injection and domestic coal quality to conduct microstructure and component analyses. The analyses of the organic and inorganic macerals and the chemical compositions of the .
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WEBMay 1, 2022 · The coal consists of raw combustibles and inert ash. Coal particle is assumed to be a sphere with a swelling core and modeled by the Lagrangian particle tracking (LPT) method [2], [22]. In simulations, the devolatilization process of raw combustibles releases the Volatile Matter (VM) into the gas while leaving the char in the .
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WEBJan 15, 2022 · The propagation process of CH 4 /coal dust flames is complied, since it contains many chemical and physical phenomena and mechanisms [24, 25]. ... Turbulent unvented gas explosions under dynamic mixture injection conditions. Symp (Int) Combust., 23 (1) (1991), pp. 851858.
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WEBAug 18, 2022 · In addition, due to the release process of volatile in dust particles, there will be a lowtemperature area with volatile enrichment in the interior of the flame peak, so the flame summit gradually develops in a ring shape. ... In addition, the simultaneous injection of pulverized coal and dust increases the number of particles, resulting in ...
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WEBJan 15, 2023 · For a typical coal seam water injection process, several boreholes are drilled in the coal seam, and pressurized water is injected into the boreholes. The water is infiltrated in the coal seam to increase the moisture of the coal seam and reduce the dust generation during mining.
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WEBApr 1, 2023 · Such structure is also conducive to adsorption of coal dust and reduction of coal dust production. In addition, this method enriches the preparation method of water injection material and provides a new preparation scheme of wettabilityincreasing agent.
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WEBApr 10, 2020 · Abstract The article considers a mathematical model of the combustion zone of a blast furnace working with the use of the injection of coaldust fuel. In this model, two subsystems were identified: (1) subsystem of heating the particles of coal dust and volatiles released in the combustion zone; (2) subsystem of heat exchange and .
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