WEBMar 5, 2022 · At this time, the coal dust has polluted the mine environment and it is difficult to control the breathing dust to a safe level in this way [9]. The other is to prevent coal dust before it is produced, such as coal seam water injection. Before coal mining, pressurized water is injected into the coal seam in front of the working face [10].
WEBJan 7, 2019 · The essence of water infusion is to wet the intact coal seam in advance, thus the occurrence of floating coal dust in the process of coal extraction will be reduced or eliminated. By injecting water into the coal body through water injection boreholes, the water is distributed evenly in the network of cracks and pores in the coal body, and the ...
WEBFeb 25, 2016 · The issue of generating dust waste is present in steel and foundry plants around the world, as all melting furnaces generate tonnes of dust every year. This dust is obviously considered to be a waste material; however, the dust itself still contains certain chemical elements (mostly iron and zinc) which can be utilised by being returned to the .
WEBJun 1, 2022 · Coal accounts for approximately 60% of China's primary energy and is an important part of the energy structure (Li et al. 2015; Zhou et al. 2020b).The clean energy produced by the coal chemical process has less environmental pollution than direct combustion (Chen et al. 2020; Guo et al. 2020).Therefore, there will still be a large .
WEBDec 15, 2023 · To address this, research on the influence of the microscopic pore structure of coal body on wetting characteristics and kinetic behavior can improve the mechanism of coal seam water injection and percolationwetting action, deepen the dust control and removal technology system at the mining face, effectively reduce the coal dust .
WEBSep 1, 2019 · The injection pressure of the dust can be varied from 0 to bar, and the volume of the constanttemperature furnace is 220 mL. Download : Download highres image (228KB) ... Experimental process. The MITs of coal dust clouds were determined according to the measurement procedures defined in EN ISO/IEC .
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 .
WEBJan 19, 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 ...
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 ...
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.
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. .
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 .
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.
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 ...
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 ...
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 ...
WEBJul 27, 2022 · In order to obtain the propagation and attenuation characteristics of a shock wave gas–coal dust explosion, a diagonal pipeline network was built to carry out a gas–coal dust explosion experiment.
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 .
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 ...
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 .
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.
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}, .
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 .
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 ...
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 ...
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 ...
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 .
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 ...
WEBMay 2, 2023 · About Pulverized Coal Injection (PCI): PCI is a process which involves injecting large volumes of fine coal particles into the raceway of the blast furnace (BF). It is an essential instrument for modern blast furnace ironmaking. PCI provides auxiliary fuel for partial coke replacement and has proven both economically and environmentally .
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.
WEBRock burst disasters can be reduced and prevented with the help of coal dust water injection. In this study, the highpressure water injection device is used to examine how the water absorption rate changes over time under various water injection pressures. The results reveal that the water absorption rate of coal samples increases quickly initially .
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].
WEBMay 27, 2020 · During transportation and storage, coal produces a lot of dust, which pollutes the environment and threatens the occupational health of workers. Although many dust suppressants have been developed for dust prevention at work, the implementation of current dust suppressants does not meet the requirements due to various factors such .
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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