Authors: Yu.S. Shcherbakov, N.V. Erofeeva

Title of the article: The method of verification calculation of the mine drainage

Year: 2023, Issue: 1, Pages: 50-57

Branch of knowledge: 2.8.8. Geotechnology, Mining machines (engineering)

Index UDK: 622.005.01-181.1(078.5)

DOI: 10.26730/1816-4528-2023-1-50-57

Abstract: Drainage installations of mining enterprises, as a rule, were laid several years ago. The pumps selected during the design with the values of maximum or normal inflows set at the time of construction of the mine or section, as well as the values of the lifting height, are currently installed for drainage. Water inflow indicators have changed during operation. However, the pumps remained the same. The need for a verification calculation of the drainage system for the parameters currently in effect arises in connection with the above. There is also a need for an economic assessment of the operation of the drainage system. Previously, it was believed that the cost-effectiveness of the installation is ensured when the operating mode corresponds to the maximum value of the efficiency of the pump. However, recent studies have shown the fallacy of this statement. Currently, the cost-effectiveness of the installation is determined by the cost of electricity per cubic meter of pumped water. At the same time, the maximum value of the efficiency of the pump does not always correspond to the minimum of specific energy consumption. The dependence of specific energy consumption for a centrifugal sectional pump 300-420 is shown in the work. For this pump size, the minimum values of specific energy consumption are shifted to the right side of the maximum efficiency of the pump. When switching to a new mode of operation of the drainage system, the expediency of the pump operation must be evaluated with lower values of the efficiency coefficient, but at the same time with lower energy consumption. Since the scope of industrial use of the pump is limited to values of 90% of the maximum efficiency, the operating mode should not be adjusted to parameters at which the efficiency of the pump will be less than 90% of the maximum. The method of determining specific energy consumption is also valid for other pump sizes. However, dependencies can have a steeper drop, which will lead to an even greater increase in energy savings. In the case of a flattening characteristic of unit costs, the cost-effectiveness of work should be evaluated by the maximum value of the efficiency coefficient.

Key words: mine drainage pump specific power consumption characteristics pressure loss

Receiving date: 08.09.2022

Approval date: 01.12.2022

Publication date: 09.03.2023

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