Hydraulic calculation of gravity transportation pipeline system for backfill slurry

Abstract

Taking cemented coal gangue pipeline transportation system in Suncun Coal Mine, Xinwen Mining Group, Shandong Province, China, as an example, the hydraulic calculation approaches and process about gravity pipeline transportation of backfill slurry were investigated. The results show that the backfill capability of the backfill system should be higher than 74.4 m³/h according to the mining production and backfill times in the mine; the minimum velocity (critical velocity) and practical working velocity of the backfill slurry are 1.44 and 3.82 m/s, respectively. Various formulae give the maximum ratio of total length to vertical height of pipeline (L/H ratio) of the backfill system of 5.4, and then the reliability and capability of the system can be evaluated.

Keywords

hydraulic calculation / critical velocity / working velocity / pipe length-backfill depth ratio / backfill capability

References

[1] YuB.. Computation and measurement of hydraulic parameters for gravity pipeline transportation [J]. Jiangxi Non-ferrous Metals, 1999, 13(4): 1-3

[2] WangP.-xun.. Hydraulic gradient calculation of mine filling paste [J]. Non-ferrous Mines, 2003, 32(1): 8-11

[3] ZhangQ.-l., WangX.-min.. Performance of cemented coal gangue backfill [J]. Journal of Central South University of Technology, 2007, 14(2): 216-219

[4] ZhouA.-min.. Mining backfill technology in China [C]. Proceedings of the 8th International Symposium on Mining with Backfill, 2004, Beijing, Nonferrous Metal Society of China: 1-11

[5] RichardD. P.. Flow velocities in pipelines [J]. Journal of Hydraulic Engineering, 1983, 109(8): 108-111

[6] ZhangW.-zhi.. Hydraulic and thermal calculation on extra-viscous crude transportation pipeline [J]. Oil and Gas Storage and Transportation, 2007, 26(4): 11-13

[7] MaoZ.-y., ZhaoX., LuoS.. Analytic expression for partially-filled flow velocity in pipe of circular section [J]. Advances in Water Science, 2007, 18(2): 170-174

[8] YinA.-w., DuanY.-g., SunJ.. The design of steam pipes hydraulic computing system [J]. Journal of Shandong Jianzhu University, 2007, 22(1): 61-64

[9] PengX., LiX.-b., ZhangQ.-l., WangX.-min.. Quality evaluation of layerlike backfilling and flow pattern of backfill slurry in stope [J]. Journal of Central South University of Technology, 2007, 14(4): 580-583

[10] ChenT.-yu.. Theoretical research on the flow resistance of sewage in pipes from two phase fluid [J]. Journal of Kunming University of Science and Technology: Science and Technology, 2007, 32(3): 68-71

[11] ZhangY.-zhe.. Study on theoretic formula of sedimentation velocity in the sediment group settlement zone [J]. Journal of Northwest Sci-tech University of Agriculture and Forestry: Natural Science Edition, 2006, 34(4): 117-120

[12] NiF.-s., ZhaoL.-juan.. Two-phase flow of highly concentrated slurry in a pipeline [J]. Journal of Hydraulics, Series B, 2004, 16(3): 325-331

[13] Editorial Committee of the Handbook of Mineral Processing.Handbook of mineral processing [M], 2004, Beijing, Metallurgical Industry Press

[14] Editorial Committee of the Handbook of Mining Design.Handbook of mining design [M], 1987, Beijing, China Architecture and Building Press

[15] LiuK.-ren.Basis of backfill theory [M], 1982, Beijing, Metallurgical Industry Press