Issue 1(41), 2016

UDC 656.342.071.8

Justification of rational water flow rate in the discharge lines of mine drainage systems

V. T. Dmitriev, S. A. Timukhin, S. V. Dmitriev, A. S. Timukhin

On the basis of the principles of classical mechanics authors analyze the costs of energy during transportation of water flows in the discharge lines of mine drainage systems. Authors obtain the dependences of the total energy of the water flow in the function of velocity of water in the pipeline. The article describes the features of energetics of idling pumping unit. It is shown that in this mode operation in the pipeline is not performed, but the energy consumption takes place. It is proportional to, inter alia, the maintenance time of this mode and the height of the column of retained water in the pipeline.

Based on the performed analysis authors establish the optimal value for the criterion of energy consumption of water flow velocities in pipelines and recommend their rational values, significantly exceeding the recommended nowdays. It is concluded that the increase in the velocity of water in the pipes will result in increased efficency of drainage systems, because it reduces both operating (energetical), and capital expenditures.

Taking into account of the results obtained proposes an increase of the recommended rational water velocities in the pipes from 2–3 m/s to 4–6 m/s.

Of course, the negative effect of increasing of the flow velocity in injection pipeline is the increase of quantity of hydraulic impact. However, its reduction to the desired values can be achieved by simple increasing of the number of check valves on the pipeline or the use of other, more advanced engineering tools. At the same time slight increase in resistance of the pipeline in a range of velocities – 4–6 m/s will not have a significant impact on energy costs when moving water through it. This follows from the analysis of energy consumption dependency in water velocity function.

Keywords: potential energy; kinetic energy; full hydraulic energy; water consumption; pressure loss; specific heat capacity; flow velocity; loss factor.

 

REFERENCES

Veselov A. I. 1956, Rudnichnyy vodootliv [Mine drainage], 532 p.

Popov V. M. 1983, Rudnichnye vodootlivnye ustanovki [Mine drainage systems], ed. 2, 304 p.

Timukhin S. S., Shleivin V. V., Uporov S. A., Shashkov S. V. 2005, Otsenka energeticheskoy effektivnosti shakhtnoy vodootlivnoy ustanovki s uchetom faktora vremeni [Assessment of the energy efficiency of mine drainage system, taking into account the time factor]. Izvestiya Ural’skogo gosudarstvennogo gornogo universiteta – News of the Ural State Mining University, vol. 20, pp. 74–77.

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