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).
However, a large amount of dust is generally produced in the process of underground mining of coal resources. Dust can cause explosion accidents and induce pneumoconiosis, which has become the primary hazard to coal mine safety and the occupational health of workers (Han et al., 2018, Xu et al., 2018, Xue et al., 2021).
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.
Pulverized coal (PC) blending with ironbearing dust (IBD) injection technology in blast furnace (BF) ironmaking process was proposed to valorize the IBD.
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.
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.
Fully utilizing the energy generated by the explosion of pulverized coal will contribute to realize the clean and efficient exploitation of coal resources. The pulverized coal explosion characteristics will be a farreaching and important task to explore. In this paper, ten kinds of lowquality coals such as high sulfur, high ash, and low metamorphic degree coals were investigated and the ...
During the COREX coal injection process, pulverized coal passes through the tuyere of the melter and gasifier and enters the swirling zone for combustion. Generate hot gas to meet the needs of ...
Coal seam water injection and spray dust reduction are the main measures to prevent and control dust on the mining face, water injection into the coal seam to be mined through boreholes, or fog field generated by highpressure atomization and can moisten the coal (dust), thereby reducing the floating coal produced during the mining process ...
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 ...
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 ...
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 ...
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.
Relying on a crosslayer extraction borehole, coal seam water injection efficiency extraction and highefficiency water injection dust prevention can be performed in the later stage of borehole extraction, enabling onehole multipurpose and "gaspowder" integrated prevention and control.
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 ...
Background Iron is a metal that has fundamentally affected the way of life of human beings ever since the Iron Age. It is relatively abundant and can easily be extracted and modified due to its useful material properties, all of which result in low prices.
The coal consumption in our country mainly lies in coalfired power stations and industrial boilers. Since the temperature change in the furnace influences combustion, slagging In the pulverized coal combustion process, turbulence impacts the radiation transmission of the medium by changing the shape of the flame, and the heat release acts on the turbulence field by changing the ...
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.
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 ...
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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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 ...
Formation and Control of Sulfur Oxides. Bruce G. Miller, in Clean Coal Engineering Technology (Second Edition), 2017 Furnace sorbent injection. With the exception of LIMB, furnace sorbent injection (FSI) is the simplest dry sorbent process. In this process, illustrated in Fig., pulverized sorbents, most often calcium hydroxide and sometimes limestone, are injected into the upper part of ...
Coal seam water injection is proved an effective method for preventing coal and gas outburst. However, the poor wettability of coal seam has resulted in poor effect of coal seam water injection in preventing coal and gas outburst. In addition, the coal seam is in a state of injecteduninjected cycle due to multiple water injection. Therefore, it is important to study the wettability of coal ...
Wuhan Iron and Steel Company developed a new red iron manufacturing technology by using BOF dust, which was a new ways for BOF dust recycling [5]. However, the research of injection of BOF dust ...
In the pulverized coal injection (PCI) process of a blast furnace (BF), intensifying the combustion of pulverized coal in the raceway and tuyere is the key to increasing the injection ratio. 3, 4 In addition to widely used technologies that cooperate with PCI, such as oxygen enrichment and high temperature of hot blast air, 5, 6 the catalytic c...
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.
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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