Hydroelectric drive of coal mine pumping units
Abstract
In conditions of coal mines regulation of centrifugal pumps is either not applied at all, or is carried out by a gate valve, which leads to deterioration of efficiency of the pumping unit and, consequently, to overconsumption of energy for drainage. As the survey data of a number of mines show, the nominal head of the installed pumps often significantly exceeds the head required to overcome static and dynamic resistances at the nominal capacity of the pumping unit. This, in turn, in order to avoid inadmissible overloading of the drive motor, leads to the need for prolonged operation of pumps with the gate valve closed, i.e. with significant unproductive losses. According to A. I. Veselov, the gauge nominal head of the installed pumps often significantly exceeds the head required to overcome the geodetic height of discharge, and the capacity of pumps is selected with a large reserve. Referring, for example, to the mines of Kizelovsky district, A. I. Veselov writes: “The largest dewatering installations of the mines named after V. I. Lenin and M. I. Lenin. V. I. Lenin and M. M. Volodarsky mines work with an excessive head reserve, and hence, of course, low efficiency of the unit. Lenin mine at the main pumping stations has an excessive installed capacity of pumps, which is equal to almost five times the normal inflow.
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