Abstract
Coalbed water injection is the most basic and effective dust‐proof technology in the coal mining face. To understand the influence of coalbed water injection process parameters and coalbed characteristic parameters on coal wetting radius, this paper uses Fluent computational fluid dynamics software to systematically study the seepage process of coalbed water injection under different process parameters and coalbed characteristic parameters, calculation results of which are applied to engineering practice. The results show that the numerical simulation can help to predict the wetness range of coalbed water injection, and the results can provide guidance for the onsite design of coalbed water injection process parameters. 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 67.85% and 46.07%, respectively, which effectively reduces the dust concentration on the working face and improves the working environment.
Highlights
Coal is the main energy source in China, accounting for about two-thirds of total primary energy consumption [1,2,3,4,5]
Coalbed Water Injection Effect Index. e effect of coalbed water injection is generally evaluated by moisture increment of the coal which is related to parameters such as water injection time, water injection pressure, porosity of the coal, and diameter of the borehole
The effects of water injection time, injection pressure, borehole diameters, and coalbed porosity on wetting radius are investigated by Fluent computational fluid dynamics software. e field application of coalbed water injection further proves that the numerical simulation can predict the wetting radius more accurately
Summary
Coal is the main energy source in China, accounting for about two-thirds of total primary energy consumption [1,2,3,4,5]. At present, coalbed water injection, ventilation for dust control, dust control by using dust remover, dust-settling by spray, foam dedusting, and sealing dust isolation are mainly used in coal mining face at home and abroad [26,27,28,29,30,31,32] It is widely believed in all coal-producing countries at home and abroad that coalbed water injection is the most basic and Mathematical Problems in Engineering effective dust-proof technology in the mining face. The influence of water injection process parameters such as water injection time, water injection pressure and borehole diameter, and coalbed characteristic parameters on wetting radius is explored, so as to provide a theoretical reference for the application of water injection and dust reduction engineering in coalbeds
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