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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The minimum concentration for obtaining a coal dust explosion that propagated in the tube was 120 g/m 3 [15]. In other experiments, Methane/coal dust/air explosions and suppression characteristic had been studied [16]. The CH 4 /coal dust/air mixture was ignited by a 7 m long epoxy propane mist cloud explosion. A deflagrationtodetonation ...
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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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Why is BNSF concerned about coal dust in the Powder River Basin? Since 2005, BNSF has been at the forefront of extensive research regarding the impacts of coal dust escaping from loaded coal cars on rail lines in the Powder River Basin (PRB), which is located in Wyoming and Montana. From these studies, BNSF has determined that coal dust poses a ...
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The better the antiwind erosion performance of dust suppressant, the more difficult the coal pile is to be destroyed. Three groups of coal powder in different particle size ranges were measured using a Rise2002 Laser particle size analyzer. The particle size distribution of the measured coal powder is shown in Fig. 3.
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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 shown in Table 1 [18]. ... The evaporation of coal dust samples increased with time after adding different concentrations of EPS dust suppressants until it stabilized ...
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Coal is an extremely brittle mineral, and both the extraction and refinement processes produce a fine powder known as coal dust. Coal is deliberately pulverized for use as fossil fuel, and this process also produces a substantial output of coal dust. Finally, mining, transportation and even the mechanical handling of coal can create coal dust.
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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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The fine dust can be produced and suspended in the air during AlMg alloy polishing process, which has a high risk of powder explosion. To investigate the inhibition effects of ammonium salts and phosphates, the suppressants of melamine cyanurate (MCA) and NaH 2 PO 4 were selected for preventing the explosion of AlMg alloy powder. The results showed that the inhibition sensitivity of MCA on ...
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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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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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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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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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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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A pulverized coalfired boiler is an industrial or utility boiler that generates thermal energy by burning pulverized coal (also known as powdered coal or coal dust since it is as fine as face powder in cosmetic makeup) that is blown into the firebox.. The basic idea of a firing system using pulverised fuel is to use the whole volume of the furnace for the combustion of solid fuels.
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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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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 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.
WhatsApp: +86 18203695377![[PDF] Explosion characteristics of H2/CH4/air and CH4/coal dust/air ...](/nw3z780/173.jpg)
Explosion Characteristics and Influential Factors of Coal dust/sodium Chlorate Mixture on Basis of an Explosion Accident in China. ABSTRACT In the paper, explosion characteristics of coal dust in the presence of strong oxidant were studied using a 20L spherical vessel, and the influential factors, including air relative..
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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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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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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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To determine the wetting process and wetting mechanism of different surfactant solutions on coal dust surface, four types of surfactants (anionic surfactant 1227, anionic surfactant AOS, amphoteric surfactant CAB35, and nonionic surfactant CDEA) are selected to measure their surface tension and contact angle. Based on the data, the adhesion work, spreading coefficient, and immersion work of ...
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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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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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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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الهند غنية بالموارد المعدنية المختلفة وهي سوق مهم لمعالجة المعادن
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