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深井掘进面单转轮多分区转轮降温系统性能分析

Performance analysis of single-rotor multi-zone desiccant wheel cooling and dehumidification system for excavation face of deep mine

  • 摘要: 随着矿井开采深度日益增大,掘进工作面围岩温度不断升高,导致深部矿井降温需求显著增加,阻碍了深部资源的可持续开发。针对传统热水地热异常型热害矿井降温除湿技术能耗高的问题,提出了适用于热水地热异常型热害矿井掘进面的单转轮多分区转轮除湿降温系统。基于焓差法对掘进工作面和降温系统建立能量平衡关系式,推导出掘进工作面的制冷量计算关系式。并建立深部矿井掘进面单转轮多分区转轮除湿降温系统热力模型,分析了不同转轮分区、转轮转速、风流参数、再生温度及冷冻水供水温度等运行参数对降温系统性能的影响。通过与不同分区设置的转轮进行对比发现:处理区、吹扫区和再生区面积比为1∶1∶2的转轮相较于没有设置分区的转轮的热力性能系数TCOP增加45%。而模拟结果表明,随着转速的增加,系统除湿能力降低,所需冷负荷增加;随着再生温度增加,系统的除湿能力提高,热力性能系数TCOP降低;随着表冷器供水温度降低,系统除湿能力增加,热力性能系数TCOP增加;最终确定系统的最佳运行工况为:转轮转速12 r/h,再生温度85 ℃,表冷器供回水温度7/12 ℃,此时系统的除湿量为124.43 kg/s,制冷量为423.93 kW,再生能耗为348.48 kW,热力性能系数TCOP达到1.22。在极端高温高湿条件下,系统热力性能系数TCOP最高可达1.15,系统除湿量与制冷量均能满足要求。

     

    Abstract: As the mining depth of coal mines increases, the surrounding rock temperature at the excavation face rises continuously, significantly increasing the cooling demand in deep mines and hindering the sustainable development of deep resources. To address the high energy consumption issue of traditional cooling and dehumidification technologies in hot water geothermal anomaly type heat damage mine, this paper proposes a single-rotor multi-zone desiccant wheel cooling and dehumidification system for excavation face in hot water geothermal anomaly type heat-harm mine. In this study, based on the enthalpy difference method, energy balance relationships were established for the excavation face and the cooling system, and the cooling capacity calculation formula for the excavation face was derived. Additionally, a thermodynamic model of the single-rotor multi-zone desiccant wheel cooling and dehumidification system suitable for deep mine excavation face was constructed, and the effects of various operating parameters—including rotor zones, rotor speed, air flow parameters, regeneration temperature, and chilled water supply temperature—on the performance of the cooling system were analyzed. Comparison with rotary wheels of different zone configurations showed the thermal coefficient of performance (TCOP) of the wheel with a processing/purge/regeneration zone area ratio of 1∶1∶2 was 45% higher than the non-zoned counterpart. Simulation results indicated that higher rotational speed reduced dehumidification capacity and increased required cooling load; elevated regeneration temperature improved dehumidification capacity but decreased TCOP; lower surface air cooler supply water temperature enhanced both dehumidification capacity and TCOP. Optimal system operating conditions were determined as: rotary wheel speed 12 r/h, regeneration temperature 85℃, surface air cooler supply/return water temperature 7/12 ℃. Under these conditions, the system achieved dehumidification capacity 124.43 kg/s, refrigerating capacity 423.93 kW, regeneration energy consumption 348.48 kW, and TCOP 1.22. Additionally, under extreme high-temperature and high-humidity conditions, the system exhibited a maximum TCOP of 1.15, with both dehumidification and refrigerating capacities meeting requirements.

     

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