A real-time method for measuring the absolute emission of tunnel gas

Abstract

The invention discloses a method for determining the absolute emission amount of tunnel gas in real time. The method comprises the following steps: S1: linear laser sensors are installed on one side of a tunnel section, the three groups of the linear laser sensors are arranged in order from top to bottom, the first group is installed 30cm below a tunnel vault, the other two groups are installed according to the averagely divided tunnel height, and the linear laser sensors are used to illuminate the other side of the tunnel section to measure the average concentration of gas on three groups ofbeams; S2: a wind speed sensor is installed 50cm below the vault of the same tunnel section of the laser sensors in step S1 to measure the wind speed of the tunnel section, and detection data of the wind speed sensor are compared with manual detection data to obtain a correction coefficient between the measured value of the wind speed sensor and the average wind speed value of the tunnel at different wind speeds; and S3: the wind speed sensor in step S2 collects data every 5S, and uploads the measured data to a control computer through a 485 bus.

Description

technical field [0001] The invention relates to a method for measuring the amount of gas gushing out, in particular to a method for measuring the absolute gas gushing out of a tunnel in real time. Background technique [0002] At present, the absolute gas emission volume in the "Technical Specifications for Railway Gas Tunnels" (TB10120-2002) and related industry specifications is obtained by calculation methods. [0003] The calculation method is: Q 0 =Q 1 +Q 2 +Q 3 ; where Q 1 is the amount of gas emitted by the blasting of coal blocks in the tunnel, and the unit of the amount of gas emitted is m 3 / min; where Q 2 is the amount of gas emission from the newly exposed working face of the tunnel, and the unit of the emission amount is m 3 / min; where Q 3 It is the amount of gas overflow on the wall of the tunnel where the shotcrete is applied, and the unit of the amount of overflow is m 3 / min. [0004] The above calculation method requires a series of parameters su...

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the manual detection method currently used cannot continuously monitor the gas concentration for a long time, and cannot continuously measure the maximum gas emission parameter. The purpose of this method is to provide a real-time measurement of the absolute gas emission Quantitative method to solve the above problems

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