process onengine combustion was emphasized, and subsequentprogress indiesel engine development has been largely dependent upon improvements infuel injection. Fig. 1. Coal dust injection system of Rudolph Diesel. AIR INJECTION (After patent No. 54286 of 1895.) The operating principle ofmost air injection systems has been similar to the one
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1. Introduction. Coal will remain dominant in energy supply in the short term from the perspective of China's resource endowment characteristics and current social and economic development needs [1], [2].The "dual carbon goals" of achieving peak carbon emissions before 2030 and carbon neutrality by 2060, has been raised as China's national strategy, and the coal industry will usher in ...
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For dust particles of d p >1 μm, inertial collision dominates the collection and settling process of dust Optimization of nozzles The nozzle is the most important component in the liquid atomization process, with nozzle performance significantly affecting the dust suppression effect of spraying (Han et al., 2020; Wang et al., 2019i; 2020a).
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The Permissible Exposure Limit for respiratory coal dust of 2 mg/m3 was enacted by the Mine Safety and Health Administration (MSHA) in 1972 in the US, and this was further reduced to mg/m 3 in August 2016 [11]. However, the available technologies used to control coal dust hardly meet the requirements of the established standards.
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To solve the problem of water injection in lowporosity and lowpermeability 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 lowfield nuclear magnetic resonance and uniaxial compression tests.
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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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Coal dust concentration was dramatically increased since the mechanized coal mining technologies widely applied in underground mining, resulting in a health threat to miners due to exposure exceed coal dust. ... such as coal seam water injection and water spray [14], [15]. Coal seam water injection has the advantage of prewetting coal body ...
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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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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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When granular coal was injected into blast furnace, it would partially replace coke, thus lowering the coke ratio. During the coking process, 16% of the energy was used to produce coal gas, and the rest was used to produce coke. By comparison, the energy consumption of granular coal production was only 2% of coke.
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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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Therefore, in the process of coal mining, it is necessary to pretreat the coal to reduce the generation and diffusion of coal dust. Theoretically, coal seam water injection is an important means to fundamentally reduce coal dust generation, and coal seam water injection fracturing technology has good fracturing and wetting effects on high ...
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Explosions Stages of a coal dust explosion. Top, Beginning stage of a propagating coal dust explosion. Middle, The flame front appears behind the shock wave. Bottom, The cycle continues with the shock wave lifting coal dust and the lagging flame front igniting and propagating the explosion.
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In order to reveal the migration mechanism of dynamic water between coal particles in the process of coal seam water injection, in this study, nuclear magnetic resonance experiments (NMR) were ...
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Coal is ground to the size of a fine grain, mixed with air, and burned in the flue gas flow. Biomass and other materials, like waste, can also be added to the mixture. Coal contains mineral matter that is converted to ash during combustion. The ash is removed as bottom ash and fly ash. The bottom ash is removed at the furnace bottom.
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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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The ignition of the coal dust layer is a process in which the dust particles accumulate energy during heating. As the thickness of the coal dust layer increases, more heat is accumulated, and less heat is lost, causing the minimum ignition temperature to decrease. ... ignition delay time and powder injection pressure of nonstick coal dust all ...
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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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Preparation process. ... The dispersion of coal dust on roadways adversely affects the productivity of coal mines and threatens the lives of mine workers. ... which was important for improving the effect of coal seam water injection and reducing the dust concentration. Investigation on the effect of functional groups on the wettability of coal ...
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Coal dust injection ON: : Coal dust injection OFF: : Ignition system ON: Explosion suppression system ON: ... the mass loss is %, mainly due to polyphosphate's dehydration process. The low pyrolysis of coal dust in the N 2 atmosphere and the endothermic effect of APP, and thus the thermal decomposition of coal dust was suppressed ...
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In the process of coal mining, a large amount of methane is emitted into the atmosphere every year, which enhances the greenhouse effect of the atmosphere. ... This paper lays a theoretical and experimental foundation for the development of a new technology for coal seam water injection dust prevention. View all citing articles on Scopus. View ...
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When the pulverized coal is injected into the BF through blowpipes and tuyeres, the coal is a source of heat and a reductant, because of the reactions of devolatilization, gasification, and combustion as well as the formation of unburned char.
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Coal seam water injection is one of the important means of mine disaster prevention, which helps to restrain the production of dust and reduce gas concentration. Ionic surfactant can change the capillary force of water in coal pore fissures, so as to enhance the wetting effect of coal seam water injection. However, the research on the effect of surfactant on the seepage process is still ...
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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 demand for coal in the future.
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Other dust recovery techniques applied in pyrometallurgical processes are pelletizing and submerged injection [8], [9]. This work uses data analytics techniques to gain insight into the operation before and after dust insufflation in the rotary kiln furnace of a 180 t h −1 RKEF ferronickel production process.
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Coal seam water injection is vital in mitigating dust pollution in coal mining operations. To investigate water imbibition and adsorption behavior on the coal surface following injection into coal seams, as well as the impact of surfactants, coal particles with sizes of 68 mm, 35 mm, and mm were selected from the Dongtan Coal Mine in Shandong Province, China.
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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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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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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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1. INTRODUCTION
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Studying the seepage process in fracture channels (where coal particles are deposited) is of great significance for improving the performance of both onsite coal seam water injection and dust ...
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A large amount of dust will be produced in the process of mine production and construction. Coal dust has great harmfulness, endangering human health, accelerating the wear of mechanical equipment, polluting the mining environment, and even inducing coal dust explosion accidents [3], [4], [5].
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