WEBMar 1, 2023 · To solve the problem of water injection in low–porosity and low–permeability coal seams, a new idea of liquid CO 2 cyclic cold soaking to improve the water absorption and wetting efficiency of coal is proposed. The evolution of the pore structure and mechanical properties of coal were studied using low–field nuclear magnetic resonance .
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WEBDec 19, 2023 · Drilling parameters. During coal mining, gas extraction and coal seam water injection require the implementation of a large number of coal seam boreholes, and the coal drill bit is the most commonly used drill bit in the process of coal seam drilling (Lu et al. 2011).In this study, diamond composite sheet coal drill bits with diameters of 28, .
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WEBMar 5, 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 chelating agent and a surfactant. The optimal composition solution was determined by surface tension, pretreatment settling time and contact angle.
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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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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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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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WEBJul 1, 2022 · Coal seam water injection technology is widely used in most coal mines at home and abroad, and it is a basic dustproof measure in coal mining face (Wu et al., 2012). Coal seam water injection can achieve the purpose of wetting coal in advance, which can reduce the dust produced at the source in the process of mining.
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WEBFeb 23, 2024 · In the fields of coal dust control and coalbed methane (CBM) development, wettability is a crucial parameter of coal, often determined by the coal–water contact angle (CA). In order to construct an accurate CA prediction model, extensive data on industrial components, element content, and coal CAs were collected. Two sets of data were .
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WEBApr 15, 2024 · This device can simulate the coinjection of pulverized coal and hydrogenrich gas into the blast furnace, enabling separate studies on each to emulate their combustion behaviors. It allows for the examination of variations in combustion rates when mixed and injected with coolants and combustion aids and the effects of different .
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WEBJan 10, 2018 · The implementation of coalseam water injection can change the physical and mechanical properties of coal, can improve the coal storage limit, prevent and control rock burst, prevent coal and gas outburst, and reduce dust concentration in .
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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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WEBPulverized coal (PC) blending with ironbearing dust (IBD) injection technology in blast furnace (BF) ironmaking process was proposed to valorize the IBD. Three aspects containing the coflow property of PC and IBD, thermal reactivity and corresponding kinetics during the PC combustion process, as well as thermal variation and unburned PC ...
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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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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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WEBNov 2, 2021 · 1. Introduction. Being one of the most primary solid waste emissions in the steel production process, metallurgical dust and sludge (MDS) are primarily produced in dry or wet dust collection and metallurgical wastewater treatment systems. 1 In 2020, the output of MDS in China reached ∼110 million tons, and most of this output has currently .
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WEBApr 12, 2022 · The process of water injection in coal seams describes the permeation behavior caused by the action of ground stress and water injection pressure. To study how ground stress and water injection pressure affect water expansion in the coal seam, based on the correlation between the electrical conductivity of coal and its water content, this .
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WEBMar 1, 2023 · Download Citation | Study on the influence of water injection pressure on water absorption process and water injection effect of coal | Rock burst disasters can be reduced and prevented with the ...
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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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WEBMar 1, 2021 · However, there are few researches on the dust suppressant for coal seam water injection. Coal seam water injection which use high pressure to inject water into the cracks of coal seam is an indispensable process for underground mining and is of great significance in the prevention and control of dust, gas, impact ground pressure, thermal .
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WEBMar 1, 2021 · To improve the wettability effect of coal seam water injection, and reduce dust production from the source, this paper proposes the preparation of three kinds of highefficiency wetting enhancers.
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WEBApr 1, 2023 · Bituminous coal (BC) poses a challenge to the implementation of coal seam water injection technology due to its high investigate the wetting interface characteristics between water molecules and BC, the wetting process of BC was analyzed based on pore evolution and molecular dynamic theory. It is found that there is .
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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 15, 2023 · 1. Introduction. Coalfired power generation is an important approach to supply energy [1].And Coalfired power stations supply over 70 % of the electricity in China [2].However, large amounts of pollutants (, particulate matter (PM), nitrogen oxides (NO x), and sulfur oxides (SO x)) are generated by combustion in coalfired, flue .
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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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WEBNov 15, 2023 · 1. Introduction. Coal seam water injection can prewet the coal body, increase the water content [1], [2], reduce dust generation [3], [4], change the physical and chemical properties of coal [5], [6], and promote gas desorption mining [7], [8] to control coal mine disasters such as coal and gas outbursts, rock bursts, and coal dust. .
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WEBApr 1, 2012 · It is visible from data in the Fig. 5: after the adoption of the designed water injection process for the coal seam water infusion, the dust concentration of the working face has been reduced greatly, with % average dust fall rate of the total dust, % of the average dust fall rate of the respiratory dust, and the dust fall effect is ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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