WEBJan 19, 2024 · Coal seam water injection is a widely employed strategy to mitigate dust in coal mines, and the effectiveness of water injection is intriely linked to the internal pore and fracture structure of the coal. During the process of coal mining, the stress induced by mining activities has a significant impact on the pore and fracture structure of ...
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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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WEBMay 1, 2023 · Section snippets Experimental materials. Coal samples were prepared from 1/3 coking coal Lu Wa (Jining, Shandong), which was crushed into dust particles (D 50 ﹤16 µm) by using a ball grinder (PBM2A, Changsha zng chemical machinery, Changsha, China). The anionic surfactant A, B and nonionic surfactant C, D .
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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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WEBNov 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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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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WEBJan 1, 2012 · coal keeps on fluctuating, but usually it is / ton. Even a small saving in coke. rate in Blast Furnace ( BF ) gives large benefit. Coal Dust Injection ( CD I ) has been playing a ...
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WEBOct 15, 2021 · On the one hand, primary coal dust can be wetted and bonded through water injection, making it lose the flying ability when coal body broken; on the other hand, the plasticity of coal body is improved due to the increased water content, resulting in a reduce of the dust production in the crushing process [32], [33]. The dust reduction ...
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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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WEBMar 1, 2021 · 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 damage and spontaneous combustion [15, 16]. The mechanism of dust control by water .
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WEBThermal reactivity and flowability of pulverized coal blending with ironbearing dust injection in blast furnace process Qiangjian Gao, Xuhang Xiao, Zhiyuan Suo, Fang Long, Fengman Shen Article 102598
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WEBFeb 1, 2013 · The use of biomass dust as a fuel in reciproing engines could be of great interest because it could combine the versatility of the ICE with the large availability and the CO 2neutral impact of biomass, with respect to coal, (see Table 1) biomass fuels generally have a lower ash and sulphur content (and ash can be easily removed by .
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WEBMar 11, 2021 · In coal mines, the most common approaches to control dust are hydraulic methods, such as water spray, and coal seam water injection. The wettability of coal dust is the key factor to determine the ...
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WEBFeb 1, 2018 · 1. Introduction. Highpressure water injection has been globally adopted in coal exploitation for the prevention and control of coal dust as well as disasters, such as rock burst and coal and gas outbursts [1], [2], [3], [4].For the prevention and control of coal and gas outbursts, highpressure water injection is preferred, as it can crush coal block .
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WEBJun 15, 2023 · The characteristics of pulverized coal injection of blast furnace ironmaking include basic performance (ash, sulfur, and fixed carbon) and process performance (ignition point, explosibility, grindability, ash fusion temperature, combustibility, and reactivity), which is an important basis for the selection of coal types for pulverized coal .
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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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WEBJan 1, 2024 · The coal seam gradually transitions from dry to fully wet, resulting in a typical unsaturated and saturated seepage process [13], Adding surfactants to water can reduce the surface tension at the solidliquid interface and enhance the wettability of water [14]. waterinjection dust reduction is the only technique that actively suppresses dust ...
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WEBAug 4, 2022 · In China, coal seam water injection technology is widely used in the prevention and control of mine gas and dust disasters. The evolution law of stress–seepage field in the range of hydraulic influence in the process of coal seam water injection is the most basic theoretical problem in coal seam water injection technology. Therefore, this .
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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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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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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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WEBMay 1, 2022 · Pulverized coal injection (PCI) is generally used in modern blast furnace (BFs) ironmaking to reduce coke consumption by burning cheaper coal. ... (CROG) after CO 2 and dust removal, which mainly consists of CO and H 2, is proposed to be injected into an industrial BF operated with different oxygen enrichments. Such a process is .
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WEBMar 15, 2020 · Coal pore structure is not only closely related to gas adsorption, but also affect the dynamic characteristics of gas desorption and order to understand the influence of pulsating hydraulic fracturing on the variation of coal pore structure, in this paper, the mercury intrusion method and liquid nitrogen adsorption method were used to .
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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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WEBSep 11, 2020 · The pulverized coal injection (PCI) is pursued to reduce the hot metal production cost by replacingthe expensive metallurgical coke with the noncoking coal.
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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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WEBMar 2, 2022 · Cite as// H. Jiang, Y. Zheng, S. Klima, Seaman and Beck, 2022, A LABORATORY STUDY OF THE DUST DEPOSITION AND SUPPRESSION PROCESS FOR RESPIRABLE COAL DUST IN A CONFINED CHAMBER, Preprint ...
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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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WEBJan 1, 2023 · Semantic Scholar extracted view of "Thermal reactivity and flowability of pulverized coal blending with ironbearing dust injection in blast furnace process" by Qiangjian Gao et al. ... {Gao2023ThermalRA, title={Thermal reactivity and flowability of pulverized coal blending with ironbearing dust injection in blast furnace process}, .
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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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WEBJan 5, 2023 · Coal seam water injection, as an important disaster prevention means in the process of coal mining, can effectively suppress coal dust, add water injection additives, can effectively improve the ...
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WEBAug 1, 2021 · Xi explored the dynamic process of water movement in coal seams during the process of water injection, analyzed the wetting process of coal surfaces by using interface chemistry theory, and obtained the conditions of coal body selfwetting [16]. Tan et al. studied the wetting mechanism of coal dust surfaces by FTIR, electrophoresis and .
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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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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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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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