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On-line detection method and apparatus of methane concentration

A methane concentration and detection method technology, applied in the direction of measuring devices, material analysis using sound waves/ultrasonic waves/infrasonic waves, instruments, etc., can solve the problem of methane concentration results being interfered by water vapor and other impurities, and avoid delays in measurement results. Simple, low-stress effect

Active Publication Date: 2012-12-19
GL TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for online detection of methane concentration to solve the technical problem that the results of measuring methane concentration in the prior art are interfered by water vapor and other impurities; Concentration online detection device

Method used

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  • On-line detection method and apparatus of methane concentration
  • On-line detection method and apparatus of methane concentration
  • On-line detection method and apparatus of methane concentration

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Embodiment Construction

[0023] An embodiment of an on-line detection method for methane concentration. The on-line detection method in this embodiment is: when the gas to be measured flows through the measurement tube, it freely diffuses into the static tube connected with the measurement tube. Ultrasonic transducers that emit and receive ultrasonic waves into the static tube are arranged. According to the layout of the ultrasonic transducers on the static tube, the sound path of the ultrasonic wave propagating in the static tube is obtained, and the ultrasonic transducer in the static tube Transmit and receive ultrasonic waves to obtain the actual propagation time of ultrasonic waves in the sound path, and divide the sound path by the actual propagation time of ultrasonic waves in the static tube to obtain the ultrasonic propagation speed C f , the C f Substitute the following methane concentration calculation formula:

[0024] p = C ...

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Abstract

The invention discloses an on-line detection method and an apparatus of methane concentration. The method is characterized in that to-be-detected gas is enabled to freely diffuse to a static speed tube communicating to a measuring tube when the to-be-detected gas flows through the measuring tube, wherein the static speed tube is provided with ultrasonic transducers emitting ultrasonic to the static speed tube and receiving ultrasonic; sonic path distance of the ultrasonic propagating in the static speed tube can be obtained according to the arrangement of the ultrasonic transducers on the static speed tube; the ultrasonic transducers of the static speed tube emit and receive the ultrasonic to obtain an actual propagating time of the ultrasonic in the sonic path distance; an ultrasonic propagation speed Cf can be obtained through dividing the actual propagating time of the ultrasonic in the sonic path distance by the sonic path distance; and the methane concentration p of the to-be-detected gas can be obtained by substituting Cf into a formula for calculating the methane concentration, wherein t is current temperature of the to-be-detected gas in the measuring tube, Cair is an ultrasonic propagation speed in the air at a temperature of t. The static speed tube used in the on-line detection method provided by the invention is simple in structure, can be directly applied in coal mine and other measuring places, and realizes on-line detection of the methane concentration.

Description

technical field [0001] The invention relates to an online detection method and device for methane concentration. Background technique [0002] The measurement of methane concentration in the underground environment of coal mines generally uses catalytic components. In practical applications, due to the interference of water vapor and other gases, it must be calibrated at least once every 7 days. The workload is heavy and the maintenance is cumbersome; The gas content in the pipeline is relatively high, and the thermal conductivity method and infrared measurement method are often used to monitor it, but the measurement results of these two methods are easily affected by water vapor and dust. It is bound to contain dust and water. Therefore, the application of the above two methods in such an environment has great limitations. Contents of the invention [0003] The purpose of the present invention is to provide a method for online detection of methane concentration to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/024
Inventor 范运兴李波黎智葛玉丽赵彤凯姜洪杰
Owner GL TECH CO LTD
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