Abstract
In order to solve the shortcomings of existing negative-pressure water-discharge devices (e.g., small bearing pressure, poor dust removal, slag discharge effect, and large pressure loss), we designed and optimized a new type of gas-drainage and dust-removal device for gas-extraction pipelines. Through the FLUENT software, we used the k-ε renormalization group turbulence model and the discrete phase model to carry out numerical simulations, studying the internal flow field, as well as the pressure and the dust particle distribution induced by the proposed gas-drainage and dust-removal device. The results show that the new device is capable of automatic stage draining and self-cleaning through its mechanical structure, and it can effectively reduce the energy consumption of extraction, improve the utilization rate of gas resources, protect the environment, and improve economic benefits, while saving installation space. When the radius of the diversion pipe is equal to the radius of the unconstrained inner cyclone at the bottom of the diversion pipe, the overall pressure loss caused by the diversion pipe is the lowest. After optimizing the new gas-extraction pipe-drainage and dust-removal device under 20 kPa, we found that it can achieve a negative pressure suction loss < 2.5% and a dust-removal efficiency > 90%. Hence, this device can ensure a high dust collection efficiency, while reducing the pressure loss, saving installation space, and reducing the amount of dust attached inside the pipe blockage when compared to existing negative-pressure water-discharge devices.
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Funding
This work was supported by the National Natural Science Foundation of China [52074173, 51604168, 51934004], the Key Research and Development Plan of Shandong Province, China [2019GSF111033], Major Program of Shandong Province Natural Science Foundation [ZR2018ZA0602], Taishan Scholars Project Special Funding [TS20190935], and Development plan of Excellent Youth Innovation Team in Colleges and universities of Shandong Province [2019KJH006].
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Responsible Editor: Murat Karakus
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Liu, Z., Li, H., Yang, H. et al. A new type of drainage and dust removal device for extraction pipeline is adopted to improve the utilization rate of methane in the process of coal mining. Arab J Geosci 15, 883 (2022). https://doi.org/10.1007/s12517-022-10191-6
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DOI: https://doi.org/10.1007/s12517-022-10191-6