红外吸收光谱的矿井瓦斯集中监控及处置系统

Mine Gas Centralized Monitoring and Disposal System Based on Infrared Absorption Spectrum

为了提高对矿井瓦斯检测的精度和处置响应速度,设计了瓦斯集中监控系统,系统主要由瓦斯检测装置、风机和监控中心组成。根据瓦斯对特定红外光谱的吸收特性,采用处理器STM32F407作为控制核心设计了瓦斯检测装置,由中红外量子级联激光作为光源,通过改进的测量气室后光强衰减,借助红外探测传感器和微弱信号处理电路测量红外光强的变化,并根据比尔-朗伯定律推导计算出气体浓度。瓦斯检测装置将采集的瓦斯浓度信息通过ZigBee网络发送到监控中心进行处理,若瓦斯浓度超标,会向所有风机发送控制指令,调整风机以最佳方式运行,尽快排出瓦斯。实验结果表明:设计的瓦斯检测装置即便在恶劣工况环境也能表现出较高的测量精度,全量程范围的平均误差仅为0.28%,明显优于化学催化传感测量方法,实现了对井下瓦斯的集中监控,且能够自动触发报警和控制风机,大大提升了矿井的作业安全。

To improve the accuracy and disposal response speed of mine gas detection,a mine gas centralized monitoring system was designed,which were composed of mine gas detection devices,fan and monitoring center.According to the absorption characteristics to specific mine gas infrared spectrum,the mine gas detection devices were designed using STM32 F407 processor as the control core.A beam was emitted by mid-infrared quantum cascade laser as the light source,which went through the improved measurement chamber and was weaker.The change of infrared light intensity was measured by infrared sensor and weak signal processing circuit,and the gas concentration was deduced according to Bill-Lambert law.The gas concentration information collected by the gas detection device was sent to the monitoring center through ZigBee network.If the gas concentration exceeded the standard,the instructions were sent to the all fans to adjust them operate in the best way,and expelled gas as soon as possible.The experimental results show that the designed mine gas detection devices have high measurement accuracy in harsh working conditions.The average error of the whole range is only 0.28%,which is obviously superior to the chemical catalytic sensing method and realizes the centralized monitoring of underground gas.The system can automatically trigger alarm and control the fan,so as to greatly improve the mine operation safety.