To ensure the safety of hydrogen/methane (H 2 /CH 4), the ordinary KHCO 3 powder was refined and modified. CO 2 and ultrafine KHCO 3 powder were selected as explosion suppression materials. A 20 L spherical gas explosion system was used to study the inhibition effects of CO 2 and KHCO 3 separately and when combined on the explosion of H 2 /CH suppression of CH 4 explosion by ultrafine ...
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The physical and chemical properties of lignite dust are tested, and on this basis, the parameters are set as follows: the density of coal dust particles is set to 1000 kg/m 3, the specific heat of coal dust is set to 1100 J/(kg·K), the volatile content of coal dust is set to %, the dust volatile content release temperature is set to 773 ...
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The coal dust particles formed by aggregation can reach μm. The consolidation layer on the coal surface reaches HA, and the wind erosion resistance can be maintained at about %. ... Advanced Powder Technology, Volume 33, Issue 3, 2022, Article 103485.
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The corresponding dust concentrations were 500 g/m3 and 200 g/m3 under 2% and 10% methane concentrations, respectively. Meanwhile, the pressure all presented an increasing trend with the reduction of coal dust diameter under five coal dust concentrations, and the explosion intensity was the greatest at 300 g/m3 coal dust concentration.
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The use of a biological dust suppressant for the prevention of mine dust was explored. A biological dust suppressant was prepared with Bacillus pasteurii, CaCl 2 and urea as raw materials. The results show that the surface tension of the bacterial solution and the CaCl 2urea solution was and mN/m, respectively, which had a good effect on wetting coal dust.
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Microbial dust suppressants are a green method to prevent and control coal dust, but the role of extracellular polymer substances (EPS) has rarely been studied. ... The coal samples were ground using a crusher and then passed through a 4080 mesh sieve to obtain experimental coal powder samples. The industrial analysis of coal samples is ...
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However, because coal dust travels ... Jan 1, 2013 by POWER. Also In This Issue. January 1, 2013. Coal. ... Any time there is powder flowing in one direction through a plastic vacuumcleaning hose ...
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For the comparison, (1) bulk dust was sizesegregated by cyclone separation and airjet sieving, (2) sizesegregated dust was dispersed and deagglomerated by using a modified smallscale powder disperser, and finally (3) particle size distributions of the coal dust were characterized by aerodynamic particle sizer (APS) and computercontrolled ...
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Surfactants can reduce the surface tension of water and improve the efficiency of spray dust reduction, but the synergistic mechanism of composite surfactant solutions wetting coal dust remains unclear. In this study, sodium dodecyl sulfonate (SDDS)/sodium dodecylbenzene sulfonate (SDBS) solution and SDDS/primary alcohol ethoxylate (AEO9) solution were prepared to wet three types of coal with ...
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In order to reduce the dust pollution caused by the coal mining process, a novel composite environmental dust suppressant for coal dust control was synthesized by corn straw, sodium carboxymethyl cellulose (CMC), and additives. This study focused on the preparation conditions of the dust suppressant, and the performances of which were investigated systematically. Response surface method (RSM ...
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Powder Technology. Volume 395, January 2022, Pages 766775. ... Coal dust, as one of the concomitants of coal mine production, is seriously limited the safe production efficiency of coal mines due to its potential explosive properties [2,3]. In addition, high concentrations of coal dust also polluted the underground working environment, which ...
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Nonstick coal is widely distributed in the world and is an important resource for human beings. The explosion characteristics and explosion suppression of nonstick coal dust are increasingly ...
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Gas/deposited coal dust explosions are always one of the major accidents in coal mines. In this paper, gas/deposited coal dust explosion and explosion suppression experiments are conducted in a large tunnel to clarify the propagation law of gas/deposited coal dust explosion and the effect of ultrafine dry powder on it in a real environment, and the evaluation method for the explosion wave ...
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Gas coal dust explosion flame bright and discrete flame found in the combustion zone [3, 8], which is the thermal resolution of coal dust caused by the combustion of volatile components. The flame ...
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It can come in the form of dirt, dust, soot or smoke. Coal and natural gasfired power plants create it, as do cars, agriculture, unpaved roads, construction sites and wildfires.
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1. Introduction. During the industrial preparation and storage of powder in coal mine, coal chemical industry and thermal power, it is easy to produce floating coal dust and form combustible dust clouds [[1], [2], [3], [4]].Floating coal dust will explode when it meets high temperature or open fire in a limited space, causing huge damage to people and property, and is one of the major hazard ...
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Photo courtesy of Dust Control Technology. The DustBoss DB60 is an oscillating, 25 horsepower fan that can cover 21,000 square feet with a blanket of fine mist atomized water droplets ...
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Coal mines in the United States have taken safety measures to avoid dust explosions, including spreading limestone powder over the coal dust. Limestone powder makes it more difficult for shock ...
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DOI: / Corpus ID: ; Experimental study on the prevention of coal mine dust with biological dust suppressant article{Shi2021ExperimentalSO, title={Experimental study on the prevention of coal mine dust with biological dust suppressant}, author={Guoqing Shi and Jiamin Qi and Wang Yanming and Liu Sun}, journal={Powder Technology}, year={2021}, volume={391 ...
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Inert powder is a common material to suppress coal dust explosion because of its convenience, low cost, high efficiency, and durability [10], [11]. Experimental studies show that inert powder can significantly reduce P max and (d P /d t ) max through heat transfer and momentum transfer between phases [12], [13], [14].
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To effectively improve the dust reduction rate of fine dust and prevent the occurrence of secondary dust, surfactantcharged water mist dust reduction technology is proposed. First, the water mist inductioncharged atomization mechanism was perfected by an inductioncharged spray experiment and the optimal atomizationcharged voltage was determined to be 10 kV. Second, by surface tension and ...
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Coal dust powder is widely used in the mining industry as construction masonry, in many ways, it is used in a variety of industries, such as construction masonry, wood dust, and cleaning business tools should not be used at home but also in the construction industry, and many other areas.
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After the red mud composite powder explosion inhibitor is added, the maximum pressure reduction rate of the coal dust is % for a 30% MCNNaHCO 3 composite powder explosion inhibitor, % for a 30% MCNKH 2 PO 4 composite powder explosion inhibitor and % for a 40% MCNAl(OH) 3 composite powder explosion inhibitor. By coal dust ...
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Dust. Iron Casting Application. This fine, powdered coal has been used to improve the surface finish of iron and copper castings since the 1870s. Used in greensand and dry sand moulding, coal dust protects the mould surface against the action of molten metal. When the metal comes into contact with a mould surface containing coal dust, a gaseous ...
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1. Introduction. A large amount of dust is generated during the production, transportation, and storage of coal. The dust seriously reduces the safety and efficiency of coal mines [1,2,3,4,5].In recent years, as both the mining depth and the degree of mechanization in coal mining has increased, the generation and transmission of underground coal dust has become more complicated.
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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]. Especially fine dust (respirable dust) is the main cause of pneumoconiosis. ... Advanced Powder Technology, Volume 31, Issue 2, 2020, pp. 792803.
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The coal dust and coal dustbacterial complex samples were mixed with KBr powder and formed into transparent flakes, then observed by FTIR spectroscopy. Dust suppression experiment. ... Coal dust with 4080 mesh size particles exhibited the strongest antiwind erosion effect. In addition, the results of calcium carbonate yield and ...
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Coal Dust Applications. Coal dust is finely milled anthracite and has many uses beyond being simply burned for power generation. African Pegmatite is a leading supplier of the highest quality coal dust for high performance applications. Coal dust is the powdered variety of coal created by pulverization or grinding of coal into fine and smooth ...
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1. Introduction. Coal resources still play an important role in industrial development [1], [2].In the process of coal mining, transportation, storage, etc., floating coal dust is easily generated and dust clouds are easily formed in the enclosed space [3].When the dust cloud encounters open flame or high temperature, the explosion and other disasters probably happen, causing huge loss of ...
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Coal dust is a finepowdered form of coal which is created by the crushing, grinding, or pulverization of coal rock. Because of the brittle nature of coal, coal dust can be created by mining, transporting, or mechanically handling it.. Grinding or pulverizing coal to a dust form before combusting it improves the speed and efficiency of burning, which makes the coal easier to handle.
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Coal is one of the most important energy sources in the world. Dust can be produced in the process of mining, processing, transportation, and use (Brodny and Tutak 2018: Xiu et al. 2020; Yuan 2020a).The diffusion of combustible coal dust may cause an explosion (Li et al. 2018).Longterm exposure of employees to air containing coal dust can lead to coal workers' pneumoconiosis and seriously ...
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The impact crushing dust generation test device, developed by China Coal Technology Engineering Group Chongqing Research Institute, is mainly composed of a drop hammer, a guide rod, a crushing rod and a sample tank, as shown in Fig. certain mass of coal was placed in the sample tank and then crushed by the drop hammer freely released from a certain height.
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Coal dust is a fine powdered form of coal, which is created by the crushing, grinding, or pulverizing of coal. Because of the brittle nature of coal, coal dust can be created during mining, transportation, or by mechanically handling coal. Blasting at mountaintop removal (MTR) sites also expels coal dust and flyrock into the air, which can disturb or settle onto nearby communities.
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