Experimental Research on Optimization and Coal Dust Suppression Performance of Magnetized Surfactant Solution

Direct use of iron ores in blast furnaces, without prior sintering leads to a reduction in production costs and energy consumption [1,2]. Fine-grained iron ores and iron oxides from ferrous wastes can be used together with coal dust and limestone in mixed injection technology through the furnace tuyeres. In this paper are presented the results of experimental laboratory investigations for establishing the physic-chemical characteristics of fine materials (iron ore, limestone, pulverized coal) susceptible to be used for mixed injection in blast furnace. [1,4]. The results of the experimental research have shown that all the raw materials analyzed can be used for mixt injection in blast furnace.

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Foam for coal dust suppression during underground coal mine tunneling

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2019.04.009 ◽

2019 ◽

Vol 89 ◽

pp. 170-178 ◽

Cited By ~ 9

Author(s):

Qing Guo ◽

Wanxing Ren ◽

Jingtai Shi

Keyword(s):

Coal Mine ◽

Coal Dust ◽

Dust Suppression ◽

Underground Coal Mine

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An Experimental Study on Wetting of Coal Dust by Surfactant Solution

Advances in Materials Science and Engineering ◽

10.1155/2020/1567461 ◽

2020 ◽

Vol 2020 ◽

pp. 1-13

Author(s):

Yidan Jiang ◽

Pengfei Wang ◽

Ronghua Liu ◽

Ye Pei ◽

Gaogao Wu

Keyword(s):

Surface Tension ◽

Contact Angle ◽

Reverse Osmosis ◽

Sodium Sulfate ◽

Moisture Absorption ◽

Coal Dust ◽

Pure Water ◽

Surfactant Solution ◽

Limited Range ◽

Dust Reduction

Surfactants can improve the wetting performance of the dust-reduction spraying water, thus improving the dust-reduction effect by spray. In this study, the performance of surfactant solution in wetting coal dust was investigated through experiments. In addition, the effects of surfactant type, mass fraction, metamorphic degree of coal, particle size, and additives were investigated. According to the results of surface tension experiments, the surface tension of the solution decreased with the increase of the concentration of surfactant. However, after reaching CMC, the surface tension did not have significantly decrease. SDBS and OP-10 had higher efficiency in decreasing the surface tension than the other two types of surfactants. The addition of sodium sulfate additives can further reduce the surface tension of the surfactant solution by a limited range. The coal dust wetting experiment showed that with the increase in the concentration of the surfactant, the contact angle of the droplets on the coal dust tablet was continuously reduced, and the wettability of the solution was continuously improved. The wettability of the OP-10 solution was optimal. At the same concentration, the minimum contact angle can be obtained in the OP-10 solution. As the contact angle of the coal dust increased, the growth rate in the coal dust reverse osmosis moisture absorption of the surfactant solution relative to the pure water increased. After the addition of sodium sulfate, the reverse osmosis moisture absorption of coal dust increased to varying degrees. In addition, as the concentration of additives increased, the moisture absorption of coal dust increased.

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Development of Environmental Friendly Dust Suppressant Based on the Modification of Soybean Protein Isolate

Processes ◽

10.3390/pr7030165 ◽

2019 ◽

Vol 7 (3) ◽

pp. 165 ◽

Cited By ~ 35

Author(s):

Hu Jin ◽

Wen Nie ◽

Yansong Zhang ◽

Hongkun Wang ◽

Haihan Zhang ◽

...

Keyword(s):

Water Retention ◽

Soybean Protein ◽

Coal Dust ◽

Sodium Dodecyl ◽

Environmentally Friendly ◽

Protein Isolate ◽

Dust Particles ◽

Dust Suppression ◽

Soybean Protein Isolate ◽

Coal Particles

Aiming to further improve the dust suppression performance of the dust suppressant, the present study independently develops a new type of biodegradable environmentally-friendly dust suppressant. Specifically, the naturally occurring biodegradable soybean protein isolate (SPI) is selected as the main material, which is subject to an anionic surfactant, i.e., sodium dodecyl sulfonate (SDS) for modification with the presence of additives including carboxymethylcellulose sodium and methanesiliconic acid sodium. As a result, the SDS-SPI cementing dust suppressant is produced. The present study experimentally tests solutions with eight different dust suppressant concentrations under the same experimental condition, so as to evaluate their dust suppression performances. Key metrics considered include water retention capability, cementing power and dust suppression efficiency. The optimal concentration of dust suppressant solution is determined by collectively comparing these metrics. The experiments indicate that the optimal dust suppressant concentration is 3%, at which level the newly developed environmentally-friendly dust suppressant solution exhibits a decent dust suppression characteristic, with the water retention power reaching its peak level, and the corresponding viscosity being 12.96 mPa·s. This performance can generally meet the requirements imposed by coal mines. The peak efficiency of dust suppression can reach 92.13%. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the dust suppression mechanism of the developed dust suppressant. It was observed that a dense hardened shell formed on the surface of the pulverized coal particles sprayed with the dust suppressant. There is strong cementation between coal dust particles, and the cementation effect is better. This can effectively inhibit the re-entrainment of coal dust and reduce environmental pollution.

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The Analysis of the Possibility of Feeding a Liquid Catalyst to a Coal Dust Channel

Energies ◽

10.3390/en14248521 ◽

2021 ◽

Vol 14 (24) ◽

pp. 8521

Author(s):

Zdzisław Bielecki ◽

Marek Ochowiak ◽

Sylwia Włodarczak ◽

Andżelika Krupińska ◽

Magdalena Matuszak ◽

...

Keyword(s):

Energy Consumption ◽

Experimental Research ◽

Lower Energy ◽

Power Plants ◽

Large Scale ◽

Coal Dust ◽

Exhaust Gases ◽

Flow Parameters ◽

Channel Outlet

This article presents the concept of a method of improving the dynamics of combustion in boilers operating in power plants, cogeneration plants, and heating plants by introducing a catalyst that is fed with a carrier in the form of droplets. Thanks to the proposed method, a greater degree of fuel burnout can be obtained, which, in turn, results in lower energy consumption in the case of producing the same amount of power. The parameters of the emitted exhaust gases and ash are also improved. The method described in the article involves the adding of a catalyst to the dust pipe of the boiler, which improves the combustion parameters. The catalyst was implemented using a sprayer/nebulizer. In order to obtain the correct flow parameters, the sprayer was modeled using CFD calculations. The calculations include trajectories, velocities and concentrations with regards to various flow parameters. Particular attention should be paid to the model of the evaporation of moving droplets. The results of these calculations enable the parameters that guarantee that the catalyst reaches the dust channel outlet in the desired form to be assessed. The analysis is an introduction to experimental research that is carried out on a medium and large scale.

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