Portable rapid hydrogen measurement device and monitoring method for fault-escaped gas

Abstract

The invention relates to a portable rapid hydrogen measuring device and a monitoring method for escaped gas from a fault. The hydrogen measuring device includes a first air inlet, a second air inlet, an air outlet, a three-way solenoid valve, a speed-regulating air pump, a quartz crystal oscillator hydrogen-sensitive film sensor, an oxygen-carrying purifier and a control circuit; the first air inlet and three One port of the solenoid valve is connected, the second port of the three-way solenoid valve, the speed-regulating air pump, the quartz crystal oscillator hydrogen-sensitive film sensor and the gas outlet are connected through pipelines in turn; the second air inlet is connected with the inlet of the oxygen-carrying purifier, and the oxygen-carrying The outlet of the purifier is connected with the three ports of the three-way electromagnetic valve, and the three-way electromagnetic valve, the speed-regulating air pump and the hydrogen-sensitive film sensor of quartz crystal oscillator are connected with the control circuit respectively. The invention measures the hydrogen concentration based on the surface acoustic wave sensing technology, reduces the influence of interfering gases, and improves the accuracy of measurement. The measurement gas path and the purification gas path are switched through automatic control, which greatly shortens the measurement recovery time of the device and improves the observation efficiency.

Description

technical field [0001] The invention relates to a hydrogen detection device, in particular to a portable rapid hydrogen detection device for fault escape gas and a monitoring method thereof, which are suitable for field mobile detection in seismic fault survey and geological and mineral exploration. Background technique [0002] The concentration of hydrogen in the earth's crust is thousands, tens of thousands or even hundreds of thousands of times higher than that in the atmosphere. The hydrogen in the earth's crust mainly comes from biochemical and chemical effects, so hydrogen sources with higher concentrations can be found in oil and gas basins, tectonic active zones, geothermal areas, and volcanic rock areas. Studies have shown that hydrogen is closely related to the current crustal dynamics, especially seismic activity and coal storage. By detecting the change of hydrogen concentration on the surface, especially detecting the concentration of hydrogen in the overflow ...

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Problems solved by technology

[0003] At home and abroad, thermal conductivity detector gas chromatography is mainly used to observe hydrogen concentration, but its sensitivity is low, and the detection limit is generally 10×10 -6 (10ppm), and the background value of hydrogen in the soil is 0.5ppm, therefore, this detection equipment cannot meet the needs of fault gas detection

Semiconductor-type hydrogen sensors usually have high sensitivity and low detection limit, but when measuring high-concentration hydrogen quickly and continuously, the sensor is prone to short-term poisoning, which affects the measurement efficiency. Type-based hydrogen detectors are mostly used for laboratory observations

In addition, whether it is a chromatograph or a semiconductor sensor, it is necessary to separate the gas through a gas chromatographic column during detection, but the use of the chromatographic column requires a certain temperature and flow rate and is lossy, especially when the content of alkane gases in the detected gas is high. These hydrogen-sensitive detection methods have poor anti-interference

Therefore, the existing hydrogen measuring instrument cannot quickly detect the hydrogen concentration in the fault gas in the field, and cannot meet the needs of field mobile detection

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