Abstract
Liquid ring vacuum (LRV) pumps used in the coal mine gas drainage system waste a considerable amount of electrical energy due to the extremely low efficiency, which has been a dramatic limitation over many decades not effectively solved using the conventional structural optimization method. Here a novel approach for drastic improvement of LRV pump efficiency, based on turbulent drag reduction theory, is proposed to reduce the useless energy consumption. Furthermore, a new kind of drag-reducing working fluid (DRWF) for the LRV pump and a supporting closed energy-efficiency system, are developed. Industrial-scale measurements are conducted on the LRV pumps with various models to evaluate the influence of the new DRWF on the overall pump performance. The experimental results show that the new approach can achieve approximately 10% pump efficiency improvement and maximally 21–24% energy-saving rate at an optimum concentration of xanthan gum of 4000 ppm in the DRWF. A cost-effectiveness analysis shows the economic viability of this approach. This technology has been commercially applied to reduce the electricity waste in coal mine gas drainage system, and the energy-saving rate reaches 15–22%, and the carbon emissions reduction for Gucheng mine in China can reach 987 tons per year, which is proved to be an effective approach to achieve China's carbon peak and neutrality goals.
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