Mining laser multi-gas beam tube monitoring system

Abstract

The invention discloses a mining laser multi-gas beam tube monitoring system, which comprises a temperature measurement host, a coupler, a light filter, a photoelectric conversion assembly and a signal processing assembly, and specifically comprises the following steps: the temperature measurement host is electrically connected with the coupler, the coupler is connected with the light filter, and the photoelectric conversion assembly is electrically connected with the coupler; the temperature measurement host is electrically connected with the signal processing assembly, so that the temperature measurement host is connected with the photoelectric energy conversion assembly, the photoelectric energy conversion assembly is electrically connected with the signal processing assembly, the temperature measurement host adopts a laser absorption spectrum technology, and the adopted formula is # imgabs0 #, l is an optical path; p is gas pressure; s (T) is spectral line absorption intensity. Compared with the prior art, the system has the advantages that an underground local beam tube monitoring mode is adopted, the continuous operation measurement period of the system is short, the real-time performance is high, and the maintenance cost is low.

Description

Technical Field

[0001] The present invention relates to the field of coal mine wire harness monitoring, and specifically to a mine-used laser multi-gas beam tube monitoring system. Background Art

[0002] At present, there are many deficiencies in the coal mine beam tube monitoring system, which cannot meet the continuous on-line monitoring and analysis of the coal spontaneous combustion marker gases in coal mines. The mine-used laser multi-gas monitoring system adopts an intrinsically safe laser multi-gas analysis and control device for underground mines developed by laser multi-gas analysis technology. It can sample gases in areas such as underground working faces, goafs, and upper corners, and transport them to the analysis and control device for on-site sampling through a positive pressure pump for real-time on-line analysis of gas change amounts. Combining with the distributed temperature measurement system in the goaf, it realizes the monitoring of fire hazards in the goaf. The system uploads the analysis data to the ground central station through the underground ring network, and uses the integrated management software of the ground central station to analyze and give early warnings on the sampled gases and distributed temperatures at the monitoring points, providing services for the prevention and control of coal spontaneous combustion fires and mine gas accidents in coal mines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a monitoring system with the characteristics of intrinsic safety, continuous monitoring, long transmission distance, wide temperature measurement range, and high positioning accuracy compared with traditional temperature measurement technologies.

[0004] To solve the above problems, the technical solution of the present invention is: a mine-used laser multi-gas beam tube monitoring system, the monitoring system includes a temperature measurement host, a coupler, a filter, a photoelectric conversion component, and a signal processing component, and specifically includes the following steps:

[0005] The temperature measurement host is electrically connected to the coupler, the coupler is connected to the filter, and thus connected to the photoelectric energy conversion component. The photoelectric energy conversion component is electrically connected to the signal processing component. Among them, the temperature measurement host adopts laser absorption spectroscopy technology, and the formula is:

[0006]

[0007] Where C: gas concentration; L: optical path; P: gas pressure; S(T): spectral line absorption intensity;

[0008] Adopt the following steps:

[0009] Step 1: Taking the safety management of the coal mine goaf as the goal, establish a comprehensive monitoring information system for goaf safety;

[0010] Step 2: Real-time monitor the temperature data information of the goaf, and report the monitoring information and data to the monitoring information system established in Step 1 in real time;

[0011] Step 3: Analyze the potential safety hazards in the goaf, and achieve real-time supervision, dynamic management of the goaf safety and handle related problems;

[0012] Step 4: For the hidden danger of spontaneous combustion of floating coal in the goaf, judge the degree of natural danger and analyze the reliable basis for judging the dangerous area.

[0013] Furthermore, the temperature measurement mainly uses a pulsed laser. The pulsed laser is based on the laser resonance amplification process, and its composition includes a laser medium, a pump source, an optical resonator and an output coupling device. The laser medium converts the pump energy into laser radiation energy through the stimulated emission process. The pump source provides energy to excite the laser medium. The optical resonator is composed of two parallel mirrors, which play the role of reflecting and amplifying the laser, and the output coupling device releases the laser beam from outside the cavity.

[0014] Furthermore, the photoelectric conversion component uses a photodiode to convert the optical signal into an electrical signal by using the photoelectric effect of semiconductor materials. The phototransistor realizes the conversion from electrical signal to optical signal through the PN junction of semiconductor materials. The fiber optic transceiver uses a semiconductor laser to convert the electrical signal into an optical signal and transmits it through the optical fiber. The receiving end then uses a photodetector to convert the optical signal into an electrical signal.

[0015] Furthermore, the comprehensive monitoring information system described in Step 1 mainly monitors the concentration of gas components such as CO2, CO, C2H4, C2H2, O2, CH4, C3H6 and temperature and humidity in the goaf, sealed area, roadway, working face and fire area in the coal mine underground. The specific technical method used is laser absorption spectroscopy technology.

[0016] The advantages of the present invention compared with the existing technology are as follows:

[0017] (1) The system of the present invention uses laser spectroscopy technology for real-time on-line detection of gas concentration, comprehensively utilizes the advantages of the existing beam tube system in coal mines, greatly shortens the pipeline length and the difficulty of gas sampling, and realizes the local real-time on-line detection of the signature gas of spontaneous combustion, providing strong support for preventing coal mine fires;

[0018] (2) The present invention is mainly used for on-line real-time monitoring of the concentration of gas components such as CO2, CO, C2H4, C2H2, O2, CH4, C3H6, as well as temperature and humidity information in the goaf, sealed area, roadway, working face and fire area in the coal mine underground. Description of the Drawings

[0019] Figure 1 is the overall architecture diagram of a mine-used laser multi-gas beam tube monitoring system of the present invention. Detailed Embodiments

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The same components are denoted by the same reference numerals.

[0021] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the accompanying drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0022] In order to make the content of the present invention easier to be clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] As Figure 1 shown, a mine laser multi-gas beam tube monitoring system, the monitoring system includes a temperature measurement host, a coupler, a filter, a photoelectric conversion component and a signal processing component, and specifically includes the following steps:

[0024] The temperature measurement host is electrically connected to the coupler, the coupler is connected to the filter, and thus is connected to the photoelectric energy conversion component, and the photoelectric energy conversion component is electrically connected to the signal processing component. Among them, the temperature measurement host adopts the laser absorption spectroscopy technology, and the formula is:

[0025]

[0026] Where C: gas concentration; L: optical path; P: gas pressure; S(T): spectral line absorption intensity; the temperature at any point in the optical fiber can be obtained from the ratio of the intensity of the anti-Stokes light signal and the Stokes light signal.

[0027] Adopt the following steps:

[0028] Step 1: Aiming at serving the safety management of coal mine goafs, establish a comprehensive monitoring information system for goaf safety;

[0029] Step 2: Real-time monitor the temperature data information of the goaf, and report the monitoring information and data to the monitoring information system established in Step 1 in real time;

[0030] Step 3: Analyze the potential safety hazards of the goaf, and realize the real-time supervision, dynamic management of the goaf safety and handling of related problems;

[0031] Step 4: For the hidden danger of spontaneous combustion of floating coal in the goaf, judge the degree of natural danger and analyze the reliable basis for the dangerous area.

[0032] The main temperature sensor uses a pulsed laser. The pulsed laser is based on the laser resonance amplification process and consists of a laser medium, a pump source, an optical resonator, and an output coupling device. The laser medium converts the pump energy into laser radiation energy through the stimulated emission process. The pump source provides energy to excite the laser medium. The optical resonator is composed of two parallel mirrors, which play a role in reflecting and amplifying the laser. The output coupling device releases the laser beam from the cavity.

[0033] The photoelectric conversion component uses a photodiode to convert optical signals into electrical signals by utilizing the photoelectric effect of semiconductor materials. The phototransistor realizes the conversion from electrical signals to optical signals through the PN junction of semiconductor materials. The fiber optic transceiver uses a semiconductor laser to convert electrical signals into optical signals and transmits them through optical fibers. The receiving end then uses a photodetector to convert optical signals into electrical signals.

[0034] The integrated monitoring information system described in Step 1 mainly monitors the concentration of gas components such as CO2, CO, C2H4, C2H2, O2, CH4, C3H6 and temperature and humidity in the gob area, sealed area, roadway, working face and fire area in the coal mine underground. The specific technical method used is laser absorption spectroscopy technology.

[0035] The mine-used laser multi-gas beam tube monitoring system uses TDLAS technology for gas detection. By selecting a laser with a suitable wavelength, two-time normalization of the original signal, linear least squares fitting technology, cross-interference compensation technology, temperature compensation technology and improved moving average key technology, high-sensitivity monitoring of ppm-level concentrations of multiple gases is achieved. This gas detection technology greatly reduces the cross-interference of gases and improves the sensitivity of gas monitoring, providing a guarantee for the accurate analysis of sampled gases in the beam tube system. The system hardware is designed according to the intrinsically safe type certification requirements, which are safer, more reliable and easier to install. The system is designed in two parts: aboveground and underground. This framework design ensures the timeliness of gas analysis in the beam tube monitoring system.

[0036] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and without departing from the purpose of the present invention, and design similar structural manners and embodiments to this technical solution without creative efforts, they should all fall within the protection scope of the present invention.

Claims

1. A mine-used laser multi-gas beam tube monitoring system, characterized in that: The monitoring system includes a temperature measurement host, a coupler, a filter, a photoelectric conversion component, and a signal processing component, and specifically includes the following steps: The temperature measurement host is electrically connected to the coupler, the coupler is connected to the filter, and thus is connected to the photoelectric energy conversion component. The photoelectric energy conversion component is electrically connected to the signal processing component. The temperature measurement host uses laser absorption spectroscopy technology, and the formula is: where C: gas concentration; L: optical path; P: gas pressure; S(T): spectral line absorption intensity; The following steps are adopted: Step 1: A comprehensive monitoring information system for goaf safety is established with the goal of serving the safety management of coal mine goafs; Step 2: The temperature data information of the goaf is monitored in real time, and the monitoring information and data are reported in real time to the monitoring information system established in Step 1; Step 3: Analyze the potential safety hazards in the goaf to achieve real-time supervision, dynamic management, and handling of related problems regarding the goaf safety; Step 4: For the hidden danger of spontaneous combustion of floating coal in the goaf, judge the degree of natural danger and analyze the reliable basis for the dangerous area.

2. The mine laser multi-gas beam tube monitoring system according to claim 1, characterized in that: The temperature measurement host selects a pulsed laser. The pulsed laser is based on the laser resonance amplification process. Its composition includes a laser medium, a pump source, an optical resonator, and an output coupling device. The laser medium converts the pump energy into laser radiation energy through the stimulated radiation process. The pump source provides energy to excite the laser medium. The optical resonator is composed of two parallel reflectors, which play the role of reflecting and amplifying the laser. The output coupling device releases the laser beam from outside the cavity.

3. A mine laser multi-gas beam tube monitoring system according to claim 1, characterized in that: The photoelectric conversion component uses a photodiode to convert the optical signal into an electrical signal by using the photoelectric effect of semiconductor materials. The phototransistor realizes the conversion from electrical signal to optical signal through the PN junction of semiconductor materials. The fiber optic transceiver uses a semiconductor laser to convert the electrical signal into an optical signal and transmits it through the optical fiber. The receiving end then uses a photodetector to convert the optical signal into an electrical signal.

4. A mine laser multi-gas beam tube monitoring system according to claim 1, characterized in that: The comprehensive monitoring information system described in Step 1 mainly monitors the concentration of gas components such as CO2, CO, C2H4, C2H2, O2, CH4, C3H6 and temperature and humidity in the coal mine goaf, closed area, roadway, working face, and fire area underground. The specific technical method adopted is laser absorption spectroscopy technology.

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