Research on the dual stage heatextraction system with large temperature difference and residual heat of mine water in Xiaojihan Coal Mine
The current heating sources for Xiaojihan Coal Mine are two 20 t/h and one 10 t/h coal-fired hot water boiler.The boilers are aging and have poor heating effects in extreme weather conditions.At the same time,they do not meet environmental protection policy requirements and need to be eliminated.Considering that the coal mine has abundant water inflow and waste heat resources underground(with the water volume of 1 268 m3/h and the water temperature is 18℃).This project uses a large temperature difference and two-stage heat pump technology to utilize the waste heat from underground water inflow,replacing existing coal-fired boilers to meet the heating needs of the entire mine.The temperature difference for the first stage heat pump is 18～11℃,and the temperature difference for the second stage heat pump is 11～5℃.Achieve the effects of deep waste heat recovery,energy conservation and emission reduction,and reducing staff and increasing efficiency.
underground water influxheat pumplarge temperature differencedouble stage heatingenergy conservation and emission reductionreduce staff and increase efficiency
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