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.
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
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.
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 ...
Among them, the coal dust injection diffusion system uses a. diffuser to form a coal dust cloud. In order to avoid the ... The study found that during the ignition process of coal dust clouds ...
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.
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.
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.
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 ...
Although VACUMAX does produce electric vacuums designed for Class II, Division 2 environments, the most economical solution for cleaning combustible fugitive coal dust is the company's air ...
Water infusion is the process of injecting water with or without surfactant under a certain pressure into the coal seam ahead of working face.
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 ...
Pulverized coal (PC) blending with ironbearing dust (IBD) injection technology in blast furnace (BF) ironmaking process was proposed to valorize the IBD.
Introduction. During integrated steelmaking, coal is typically used in the blast furnace to offset the use of metallurgical coke as a fuel as it is more costeffective particularly with the global scale extreme pressures on coke at present, the EU has enlisted coke as a critical material [Citation 1].The amount at which the coke can be offset is highly dependent on the chemistry of the coal.
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. ...
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 study designs a coal humidity detection system that ...
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 ...
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.
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).
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...
Coal briquettes. During the production of coal briquettes, coal dust is mixed with starch paste and water before heating and compression into an ovoid shape. The starch provides structural support to the briquette shape and ensures that the structure is maintained during transport of the briquette to the oven on the conveyor belt.
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 as the hydrophobic nature of coal dust and a harsh external ...
Recent research on liquid spray additives for coal dust suppression has been focused on enhancing the wetting ability while neglecting the mitigation of dust reentrainment issue. ... Experimental synthesis and performance comparison analysis of highefficiency wetting enhancers for coal seam water injection. Process Safety and Environmental ...
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].
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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