Instrument for monitoring gas emission quantity in roadway

[0028] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0029] See figure 1 , Example 1 A gas emission monitoring instrument in a tunnel, including a data processing module 1, containing MSP430 series single-chip microcomputer, memory and peripheral circuits, used to store and analyze and process data, according to the formula Q=GVS and numeric keyboard 6 input Calculate the gas emission from the tunnel section information, and output the gas emission together with the gas concentration and wind speed at the same time, where Q is the gas emission, G is the gas concentration, V is the wind speed, and S is the tunnel cross-sectional area. Gas concentration sensor 2, used to detect gas concentration information. The signal conditioning circuit 3 composed of an amplifier circuit and a filter circuit is used to amplify and filter the gas concentration signal and the wind speed signal detected by the gas concentration sensor 2 and the wind speed sensor 4. The wind speed sensor 4 is used to detect wind speed information. The A/D converter 5 is used to convert the amplified and filtered analog signal into a digital signal and input it to the data processing module 1. The numeric keyboard 6 is used to input the information of the tunnel section into the data processing module 1. The upper computer 7 is used to collect the wind speed, gas concentration and gas emission data output after analysis and processing by the data processing module 1, and to calculate and display the wind speed, gas concentration and gas emission volume curve of the measured point with time. The liquid crystal display 8 is used to display the wind speed, gas concentration and gas emission information output by the data processing module 1.

[0030] See figure 2 , Example 1 The gas emission monitor includes the monitor main body 9 and the keyboard input and liquid crystal display part 10. The gas concentration sensor 2 and the wind speed sensor 4 are arranged in the main body of the monitor. The gas concentration sensor probe 11 and the wind speed sensor probe 12 are connected with the sensor body through signal lines. The two probes can be extended or retracted from the main body of the monitor for convenience The sensor probes are in different positions. Gas concentration sensor probe and wind speed sensor probe are used to detect gas concentration and wind speed information respectively. There are two buttons 13 on the main body 9 of the gas monitor, which can easily extend and retract the gas concentration sensor probe 11 and the wind speed sensor probe 12 to facilitate the placement and detection of the probe and prevent the probe from being damaged when moving. The keyboard input and display part 10 includes: a liquid crystal display 8 and a numeric keyboard 6. The liquid crystal display 8 is used to display gas concentration, wind speed and gas emission, and the numeric keyboard 6 is used to input information of the roadway section. The data processing module 1 is arranged in the main body 9 of the monitor, and is connected to the sensor through a data line 14, connected to the alarm circuit 15 through the data line 18, and connected to the upper computer through the data line 17. 16 is an explosion-proof device, which protects the probe but does not affect the measurement.

[0031] Install the instrument at a suitable location in the roadway. When there is gas gushing or gas outburst in the roadway, the gas concentration sensor probe 11 and the wind speed sensor probe 12 measure the relevant data, and then calculate the gas emission value. Compare with the upper and lower limits of the safety value of gas emission stored in the data processing module 1. The upper and lower limits of the safety value of gas emission need to be stored in advance. Considering that the wind speed range in the roadway is 4m/s-8m/s, the gas concentration range is 0.8%-5%. Comprehensive various factors, set the gas emission when the yellow light is on The range is 6% S-20% S, where S is the cross-sectional area of ​​the roadway. When the measured gas emission exceeds the upper limit of the safe value by 20%S, the alarm circuit 15 will display a red light and alarm; when the measured gas emission is lower than the lower limit of the safe value by 6%S, the alarm circuit 15 will display a green light; If the gas emission amount is between the upper and lower limits of the safety value, the alarm circuit 15 displays a yellow light. After the alarm is generated, the real-time monitoring results can be viewed through the upper computer immediately, so that relevant measures can be taken in time. When there is no large amount of gas in the tunnel, you can also use the curve obtained by the upper computer to study the change law of the gas emission.

[0032] The gas emission monitoring instrument in the roadway of the present invention solves the problem of the untimely and inaccurate measurement of the gas emission under the gas outburst environment in the roadway, and the monitoring result is faster and more accurate. It can output gas concentration, wind speed and gas emission information at the same time, and it is convenient to query various data of each measurement point in the roadway after gas outburst. It can display the change curve of gas emission in real time, which is beneficial to accurately analyze the change law of gas emission in the tunnel.