煤自燃预测预报的正压束管监测方法研究

Study on monitoring and measuring method of positive pressure bundle tube for prediction and forecast of coal spontaneous combustion

针对煤自燃预测预报时采用的负压束管监测系统存在环境空气易漏入束管中,使所监测到的气体浓度和成分不能真实反映被监测地点实际情况的问题,基于正压输送气体方式的最大输送压力不受真空度限制且大于环境压力,气体在输送过程环境气体不可能进入束管等优点,提出以正压作为检测气体的输送方式,研制一种正压束管监测系统。利用不同长度的束管进行正压输送气体试验,试验及理论计算结果表明:正压输送动力是负压输送动力的4.3倍,采用正压输送气体不仅缩短了气体的输送时间,而且保证了气体浓度不变。正压束管所测得的数据能够真实反映出煤自然发火状态。

According to the forecast and prediction of coal spontaneous combustion, due to environment air easily leaked into bundle tube existed in positive pressure bundle tube monitoring and measuring system, the monitored and measured gas density and contents could not actually reflect actual condition problem of monitored and measured location.Based on positive pressure gas transportation method, the max transportation pressure would not be restricted by the vacuum and could be higher than the environment pressure.During gas transportation process the environment gas could not enter into the bundle tube and would have other advantages.Positive pressure was provided as detected gas transportation method and a positive bundle tube monitoring and measuring system was researched and developed.The positive pressure gas transportation experiment was conducted with different length bundle tubes. The experiment and theoretical calculation results showed that positive pressure transportation power was 4.3 times higher than negative pressure transportation power.The application of positive pressure air transportation would not only reduce air transportation time, but could ensure gas density unchanged.The data measured by positive pressure bundle tube could actually reflect coal spontaneous combustion status.