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This paper introduces the design and the test data analysis of a heating system for a wellhead room in a coal mine. Combined with the system design, the actual operational data of the water jet spray heat exchange device was analysed to calculate some coefficients, the thermal efficiency and the spray heat resistance. For demonstrating the practical application of this heating system, a field test was conducted where the outdoor environment temperature was -7.4°C. The air outlet temperature of the air heating unit was 27.8°C and the air inlet temperature of a wellhead room after mixing the outdoor air and the hot air supplied from the air heating unit was 11.5°C. This performance data demonstrated that this mine return air heat exchange system well satisfies the heating requirement for the wellhead facilities in coal mines located in cold areas and shows significant advances in the designing and operation of the heating system.

Design and test data analysis of a heating system for a wellhead room in a coal mine