干冰相变发生器的性能测试
Performance Test of Dry Ice Phase Change Generator
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摘要: 为了解决使用干冰进行采空区防灭火时干冰升华太慢的问题,设计了一种新的能使干冰快速升华的装置—干冰相变发生器,该装置通过水流供热可使干冰快速气化。为了使该装置顺利地应用于煤矿井下,对其进行了性能测试,通过在实验室中进行实验,分析了干冰相变发生器水流供热部分的水力特征、产气量变化,并计算了换热量,评估了铜管冻结风险。结果表明:该装置能够稳定高效地供气4 h,铜管中的水流在正常情况下不存在冻结的风险,认为该装置具有良好的防灭火性能,可应用于采空区防灭火。Abstract: To solve the problem that the sublimation of dry-ice is too slow when it was used for fire prevention in goaf, a new device, dry-ice phase transformation generator, has been designed, which can improve the speed of dry-ice sublimation by the heat supply of water. In order to make the device successfully applied to underground coal mines, its performance was tested. Through the laboratory experiments, its hydraulic characteristics of the hot water supply part and gas production change were analyzed, the heat transfer was calculated, and the risk of copper tube freezing was evaluated. The results show that the device can produce CO2 stably and efficiently for 4 hours, and the water in the copper pipe does not have the risk of freezing under normal conditions. Finally, it is concluded that the device has good fire-fighting performance and can be used in goaf fire-fighting.
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