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 ...
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 ...
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.
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.
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.
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 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 ...
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 wettability of coal body, improve the permeability of coal body, so as to achieve the prevention of rock .
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 ...
Water infusion is the process of injecting water with or without surfactant under a certain pressure into the coal seam ahead of working face.
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.
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 ...
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 ...
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 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.
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 ...
Coal seam water injection is one of the important technical means to prevent mine disasters. It can effectively change the mechanical properties of coal, prevent dust, coal and gas outburst, and reduce gas concentration. In order to expand the range of coal seam water injection, make coal seam water injection more effective in wetting coal mass, and determine the effective type of ionic ...
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 % ...
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 ...
Process Automation Simulation Pulverized coal injection (PCI) Pulverized Coal Injection (PCI) using the denseflow method The Küttner developed and perfected denseflow method offers several advantages over a lowerdensity system.
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 ...
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 ...
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.
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 ...
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 ...
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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