Surfactant can improve the wettability of water to coal, which is beneficial to reduce the production of coal dust in coal seam water injection. Through the measurement and calculation of contact angle and its decay rate, the wettability differences of SDS (C12H25OSO3Na), AES (C14H29O5NaS), OP10 (C18H30O10), and JFC (RO(CH2CH2O)nH) to anthracite were compared. In addition, the wetting ...
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In the process of applying surfactant, the surfactant concentration is a key parameter, which directly affects coal's wettability ... Table 3 shows that the reduction rates of total dust and respirable dust of ordinary coal seam water injection were % and %, respectively. This was due to the expansion of the wetting range and the ...
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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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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 ...
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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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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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The PIPR in the 1 m 3 chamber with one pressurized dust container was with 115 mbar lower than the PIPRs in the 20Lsphere (see Fig. 3).In cases with higher dust amounts two dust containers can be used so theoretically the PIPR may be around 200 mbar. For the reported values of p max this means, the explosion pressures may be 10 % to 20 % higher than if they were measured under ambient pressure.
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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.
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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.
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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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1. INTRODUCTION
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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...
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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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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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Water infusion is the process of injecting water with or without surfactant under a certain pressure into the coal seam ahead of working face.
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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.
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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 ...
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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 ...
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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).
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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.
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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 ...
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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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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 ...
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In the process of coal mining, coal dust disaster are major hidden dangers that affect the safety production. The coal seam water injection is a comprehensive measure to eliminate the risk of reducing dust efficiently. When water enters the coal body, the coal seam is wetted, which thus reduces the generation of coal dust during crushing.
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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 ...
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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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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 this paper, the effect of complex fractures on the impact of a lowpressure coal seam water injection was investigated by dividing the fractures in the coal into two categories (namely a plane fracture and surface fracture), of which there were eight types. Numerical simulations were then conducted on the water injection process in accordance with the actual extraction conditions ...
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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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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.
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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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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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