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 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 ...
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 ...
Formation and Control of Sulfur Oxides. Bruce G. Miller, in Clean Coal Engineering Technology (Second Edition), 2017 Furnace sorbent injection. With the exception of LIMB, furnace sorbent injection (FSI) is the simplest dry sorbent process. In this process, illustrated in Fig., pulverized sorbents, most often calcium hydroxide and sometimes limestone, are injected into the upper part of ...
When granular coal was injected into blast furnace, it would partially replace coke, thus lowering the coke ratio. During the coking process, 16% of the energy was used to produce coal gas, and the rest was used to produce coke. By comparison, the energy consumption of granular coal production was only 2% of coke.
In the process of coal seam water injection and spray dustfall, the dust fall rate of total dust and dust is approximately 30%40% without adding any surfactants. In this study, to compare and analyze the application effect of the developed new materials, we compared the strong permeability and moisturizing material (SACB) with the traditional ...
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 ...
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.
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 ...
The use of biomass dust as a fuel in reciprocating engines could be of great interest because it could combine the versatility of the ICE with the large availability and the CO 2neutral impact of biomass, with respect to coal, (see Table 1) biomass fuels generally have a lower ash and sulphur content (and ash can be easily removed by water leaching), and have a large volatile ...
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.
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 ...
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 % ...
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.
Other dust recovery techniques applied in pyrometallurgical processes are pelletizing and submerged injection [8], [9]. This work uses data analytics techniques to gain insight into the operation before and after dust insufflation in the rotary kiln furnace of a 180 t h −1 RKEF ferronickel production process.
In China, coal seam water injection technology is widely used in the prevention and control of mine gas and dust disasters. The evolution law of stressseepage field in the range of hydraulic influence in the process of coal seam water injection is the most basic theoretical problem in coal seam water injection technology. Therefore, this paper first uses the radial seepage experimental ...
1. Introduction. In the process of coal mining, coalseam water injection can play the role of wetting the coal seam, which is conducive to minimizing the amount of coal dust produced in the mining process (Zhang et al., 2018, Wang et al., 2019a, Wang et al., 2019a, Zhou et al., 2017a).However, most coal mines—particularly deep mines— have the problems of low porosity, poor wettability, etc.
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 ...
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.
When the pulverized coal is injected into the BF through blowpipes and tuyeres, the coal is a source of heat and a reductant, because of the reactions of devolatilization, gasification, and combustion as well as the formation of unburned char.
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 ...
Coal is ground to the size of a fine grain, mixed with air, and burned in the flue gas flow. Biomass and other materials, like waste, can also be added to the mixture. Coal contains mineral matter that is converted to ash during combustion. The ash is removed as bottom ash and fly ash. The bottom ash is removed at the furnace bottom.
Water infusion is the process of injecting water with or without surfactant under a certain pressure into the coal seam ahead of working face.
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 ...
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 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.
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 ...
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.
Pulverized coal (PC) blending with ironbearing dust (IBD) injection technology in blast furnace (BF) ironmaking process was proposed to valorize the IBD.
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.
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 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 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 ...
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.
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