CN111779540A - In-situ detection and remote monitoring analysis system and method for mine underground closed environment parameters - Google Patents
In-situ detection and remote monitoring analysis system and method for mine underground closed environment parameters Download PDFInfo
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Abstract
The invention discloses a system and a method for in-situ detection and remote monitoring analysis of parameters of a closed environment under a mine, wherein the system comprises a filtering type gas guide pipe, a micro-power-consumption direct-current negative pressure vacuum pump, a long-optical-path catadioptric absorption cell, a multi-gas in-situ detection and analysis device, an intrinsically safe power storage power supply module, an Ethernet communication system and a remote monitoring center of closed parameters under the mine. The closed internal parameter monitoring system is arranged on a closed wall, is powered by an intrinsically safe power storage power supply device, has the endurance of more than 2 months, and is used for pumping air once every 12 hours by a negative pressure vacuum pump in a normal state, pumping closed internal gas into a gas chamber to be tested, carrying out in-situ analysis on gas components by using a spectrum absorption principle, transmitting a test result to a ground monitoring center through an industrial Ethernet, and researching and judging sampling parameters by using a closed disaster area early warning model; when the in-situ detection parameters exceed the preset indexes, the gas component detection frequency is increased to 5 minutes once, the dynamic monitoring and early warning of abnormal information are achieved, and the occurrence of disaster accidents is effectively reduced.
Description
Technical Field
The invention belongs to the field of monitoring and controlling of gas concentration in a closed underground coal mine, and particularly relates to a system and a method for in-situ detection and remote monitoring and analysis of parameters of a closed environment in the underground coal mine. .
Background
Mine fire is a major hidden danger of coal mine safety production, the mining air is a region which is most prone to spontaneous ignition in the underground coal mining process, the number of spontaneous ignition accounts for about 60% of the total number of the whole underground ignition, the natural ignition number is a key point of coal spontaneous combustion prevention in the stoping process, and safety production of a mine is seriously threatened. As the temperature of coal rises in the spontaneous combustion process of coal, the oxidation of coal can generate CO and CO2、C2H4、C2H6And monitoring the state parameters of the characteristic gas in the air-producing seal to monitor the reaction degree of the spontaneous combustion of the coal under the general condition, and predicting and forecasting the change condition of the spontaneous combustion of the coal in the air-producing seal according to the change rule of the gas. Because the mine has the bad production environment such as large caving space in air extraction seal, strong concealment of spontaneous combustion area, invisible generation and development condition of internal spontaneous combustion fire source and the like, and the high-temperature area at the initial stage of coal spontaneous combustion is small, workersThe personnel can not stay on the site for a long time to observe whether the equipment is perfect, the gas parameters in the mine airtight wall are key factors for directly representing whether the state in the air-producing airtight wall is normal, and the prediction and forecast of the spontaneous combustion of the coal in the air-producing airtight wall can be very difficult. Therefore, data acquisition needs to be carried out on gas parameters in the closed mine, research on accurate detection of concentration of spontaneous combustion gas of coal in the closed air-closed inner mining air is carried out, and the method has very important significance for efficiently preventing and controlling coal spontaneous combustion and avoiding serious safety accidents caused by spontaneous combustion of coal in the closed air-closed inner mining air.
The mine sealing wall is an important component of a ventilation system and is mainly used for adjusting wind flow, changing the direction of the wind flow, isolating water, fire, gas and other harmful gases, blocking filling materials from invading a workplace and preventing explosion or damage of a roof caused by large-area instantaneous falling shock waves. The in-situ integrated accurate analysis of the coal spontaneous combustion multi-component gas in the air-mining airtight wall is realized by monitoring and controlling the concentration of toxic and harmful gas in the airtight wall, a key technical support is provided for the accurate detection of the high temperature point of coal spontaneous combustion, and then the effective prediction and prevention of the natural ignition of the coal in the air-mining airtight wall are realized. In order to effectively control the possibility of fire hazard in the enclosure, it is necessary to properly design the whole device for collecting and monitoring the gas in the enclosure.
The management of the coal mine underground sealing wall is regulated, and a gas inspector is responsible for inspecting the permanent and temporary sealing of the area for 1 time each shift; the old underground worker is responsible for checking the permanent and temporary sealing of the mine for 1 time every 7 days, the checking contents comprise carbon monoxide, carbon dioxide, gas, oxygen concentration and wall and surrounding rock conditions, and the checking result is recorded into a ventilating facility checking record book. However, this manual sampling is relatively cumbersome and highly dangerous. Therefore, it is very important to find a convenient and effective method for sampling and inspecting the gas in the airtight wall.
Disclosure of Invention
The invention relates to an in-situ detection and remote monitoring analysis system and a remote monitoring method for parameters of a closed environment under a mine. The method mainly realizes accurate analysis of various coal spontaneous combustion gases in the air-mining closed system by a rapid integrated in-situ analysis method of coal spontaneous combustion multi-component gases, and provides a key technical support for accurate detection of high temperature points of coal spontaneous combustion.
The purpose of the invention is realized as follows: an in-situ detection and remote monitoring analysis system for parameters of a closed environment under a mine comprises a filtering type air guide pipe, a micro-power consumption direct-current negative pressure vacuum pump, a long-optical-path catadioptric absorption cell, a multi-gas in-situ detection and analysis device, an intrinsically safe electric power storage module, an industrial Ethernet communication system and a ground remote monitoring and early warning center; the filtering type air guide pipe is connected with the inner side and the outer side of the closed wall through the observation hole and is used for sampling mixed gas in the air-collecting closed wall; the micro-power consumption direct current negative pressure vacuum pump is connected with the filtering type gas guide pipe and is used for extracting gas in the closed space; the long optical path catadioptric absorption pool is a closed space with an air inlet and an air outlet at two ends respectively, is packaged by adopting nano-scale magnesium hydroxide, a modified aluminum hydroxide flame retardant or a light magnesium oxide flame retardant material, and three staggered reflectors are arranged at two ends to realize effective superposition of optical paths; the device is used for temporarily storing, analyzing and discharging the gas in the closed space extracted by the micro-power consumption direct current negative pressure vacuum pump, and separating the component concentrations of the carbon oxygen gas and the olefin gas; the multi-gas in-situ detection and analysis device comprises a near-infrared light band light source transceiver, a light source driving integrated circuit, a phase-locked amplifier and a central processing unit; the central processing unit sends a detection signal to the light source driving integrated circuit; the light source driving integrated circuit drives the near infrared light band light source transceiver to emit light beams with different wave bands, and spectrum signals of coal spontaneous combustion multi-component index gas with different concentrations are obtained by utilizing multiple reflections of the light beams in the long-optical-path catadioptric absorption cell; the near infrared band light source transceiver transmits the spectrum signal to the central processing unit for analysis and storage after processing by the lock-in amplifier; the central processor is connected with a vacuum pump control circuit and used for controlling the micro-power consumption direct current negative pressure vacuum pump to pump the closed gas to the long-optical-path catadioptric absorption cell; the central processor is also connected with a remote communication control circuit, and the industrial Ethernet communication system is used for transmitting the analysis result of the underground multi-gas in-situ detection and analysis device to a ground remote monitoring and early warning center; the intrinsic safety type power storage power supply module supplies power to the micro-power-consumption direct-current negative-pressure vacuum pump, the multi-gas in-situ detection and analysis device and the industrial Ethernet communication system; the ground remote monitoring and early warning center comprises a monitoring center station, a communication module, a display terminal and a server.
The filtering type gas guide pipe is made of a mine flame-retardant polyethylene pipe, and the two ends of the filtering type gas guide pipe are provided with filtering devices for filtering solid impurities and high-humidity gas and reducing the influence on the light absorption tank; the airtight sampling hole is 300-400 mm away from the airtight wall top plate, and the air guide pipe is connected with the inner side and the outer side of the airtight wall top plate through the observation hole and is used for sampling various gases in the airtight air sampling cavity.
The Ethernet communication system adopts the combination of cable transmission and wireless radio frequency transmission to transmit information.
The micro-power consumption direct-current negative-pressure vacuum pump selects a ZX 512-503-.
The ground remote monitoring and early warning center comprises a monitoring center station, a communication module, a display terminal and a server.
The intrinsic safety type power storage module adopts a mining explosion-proof DTK30 type lead-acid storage battery, the voltage is 5V, the rated capacity is 30AH, and the size is small; the device is mainly used for supplying power to the underground micro-power consumption monitoring device, reducing the danger and being durable for a long time.
The monitoring central station is used for butting information transmitted by the underground closed in-situ detection and analysis device through the communication system; the communication module is used for data transmission between the ground monitoring center and the underground communication system, and the communication mode mainly carries out data transmission in a mode of combining wired and wireless modes; the display terminal is used for displaying the real-time state of the gas components and the concentration in the closed mine in real time; and the server is used for acquiring, storing, analyzing, early warning and displaying the gas information in the air extraction seal in the underground seal, and providing service for monitoring whether the information is normal or not.
The infrared band light source transceiver is of a KYL850N300-60 type; the phase-locked amplifier selects an AD630JNZ balanced modem chip; the central processing unit selects an MSP430F149 micro-power consumption singlechip.
A method for in-situ detection and remote monitoring analysis of mine underground closed environment parameters specifically comprises the following steps;
step 1), determining the arrangement position and the communication mode of an in-situ detection device of environmental parameters in the underground coal mine seal by combining the current situation and the requirement of the underground coal mine seal management, wherein the device is in a sleep state in a normal state for high efficiency and energy conservation, awakening once every 12 hours, sampling gas in the seal according to a set function, carrying out in-situ analysis on the components of the sampled gas, and transmitting the components to a ground remote monitoring analysis center through an industrial Ethernet communication system; the specific sampling process is as follows:
step 1.1), when an in-situ detection device for environmental parameters in underground closed environment is awakened, starting a micro-power-consumption direct-current negative-pressure vacuum pump to pump air, pumping air-collecting closed internal gas into a long-optical-path catadioptric absorption tank, replacing original gas in the long-optical-path catadioptric absorption tank through an exhaust process, closing the micro-power-consumption direct-current negative-pressure vacuum pump after all the gas in the long-optical-path catadioptric absorption tank is the air-collecting closed internal gas, and starting a multi-gas in-situ detection analysis device to analyze gas components;
step 1.2), after the multi-component gas in-situ detection and analysis device is started, light beams with different wave bands are emitted by a stable light source transceiver with a near infrared light wave band, the light beams are transmitted in multi-component mixed gas, and the light velocity is reflected for multiple times in a long-optical-path catadioptric absorption cell according to the absorption and reflection effects of different gases on the light beams with specific wave bands, so that the transmission time of the light velocity is delayed, and the precision and the effect of gas component analysis are improved;
step 1.3), in the process of separating and analyzing the multi-component gas components, adopting an artificial neural network algorithm to fit different gas demodulation and analysis methods under the mutual influence of multiple parameters of concentration, testing the absorption spectrum signals of the coal spontaneous combustion multi-component index gas with different concentrations through experiments, and verifying the spectral separation effect and the sensitivity of the method to the hydrocarbon gas with different concentrations, wherein the calculation formula is as follows:
in the formula, parameters v and alpha respectively represent the central position and the spectral line width of an absorption peak, and s is an undetermined coefficient related to the peak value of the absorption peak;
establishing a correction method under the influence of multiple parameters based on a multi-target particle swarm-extreme learning machine algorithm, reducing the number of hidden layer neurons of the extreme learning machine aiming at the characteristics of spectral line interference, and improving the generalization performance and convergence speed of the network; a concentration correction model of a nonlinear function relation is established by adopting a spectrum correction method, a concentration correction method and an algorithm based on an improved particle swarm optimization extreme learning machine, so that the overlapping separation of hydrocarbon gas absorption spectral lines and the active correction of the interference of various gas absorption spectral lines are realized, and the high-sensitivity detection of the coal spontaneous combustion multi-component gas is realized;
in the specific implementation process, the air pump completely replaces the gas in the absorption cell of the detection device within 2min, and then the in-situ detection device acquires n concentration data, and the average value of the n concentration data is used as the contrast concentration; repeating the measurement, recording the measured data result, and calculating the standard deviation S of the measurement result, wherein the calculation formula is as follows:
wherein C represents a concentration value of a target assay component; k represents the sampling times; respectively selecting multi-component standard gas to perform experimental test, analyzing the repeatability difference of experimental results, and checking the consistency of the measurement results of the system;
step 1.4), carrying out three-time gas component analysis in a short time by using an underground closed internal environment parameter multi-gas in-situ detection analysis device in order to improve the precision, wherein the analysis time of the device is ms grade, comparing detection results, taking an average value within the time that the deviation of three groups of data is less than 5%, carrying out repeated detection when the deviation is large, and iterating in the above way; after finishing a group of high-precision measurement data, transmitting the detection result of the in-situ detection device to a ground remote monitoring analysis center through an industrial Ethernet;
step 2), the ground remote monitoring and early warning center displays the underground acquired data on a terminal software platform and simultaneously stores the data in a preset database for historical data query; a closed disaster area early warning study and judgment model is built in the monitoring terminal software, and the sampled data is compared with a threshold value in the early warning study and judgment model in real time; when the monitoring result is within the threshold range, the ground remote monitoring and early warning center displays, refreshes and records the data in a normal state;
step 3), when the monitoring data of the ground remote monitoring and early warning center exceeds a threshold range, starting early warning by a system platform; issuing an instruction to the in-situ detection device of the environmental parameters in the underground closed system through the industrial Ethernet system, and triggering the sampling frequency of the in-situ detection device to be increased from once every 12 hours to once every 10 minutes; the system platform starts an early warning program, performs statistical analysis on remote monitoring data, fits a key index gas change curve, provides reference for making a fire prevention and extinguishing scheme, and improves the decision-making efficiency of abnormal early warning in the closed environment; and after the abnormality is eliminated, the normal state of the closed environment parameter in-situ detection and remote monitoring analysis system under the mine is automatically recovered.
The gas monitoring chamber in the system mainly extracts and collects carbon oxides such as carbon monoxide, carbon dioxide, oxygen, gas, ethylene, acetylene and the like and olefin gases and is used for controlling the interconnection of the air pump and the multi-gas parameter in-situ detection and analysis device.
The multi-gas parameter in-situ detection and analysis device in the closed environment parameter in-situ detection and remote monitoring and analysis system under the mine is mainly used for testing the absorption spectrum signals of coal spontaneous combustion multi-component marker gas with different concentrations, and separating and detecting the spectra of hydrocarbon gas with different concentrations.
The principle of the in-situ analysis device is mainly based on CH under different concentration ratios4CO and C2H4The spectral characteristics of the mixed gas are used for researching the influence rule of different spectral line broadening on the absorption spectral line interval, an MPSO-ELM compensation model of the nonlinear mapping relation is established, and elimination of mixed gas is proposedMethod for absorbing interference by gas spectral line to realize CO and CH in coal spontaneous combustion multi-component gas4、C2H4High sensitivity measurement of isocarbon oxygen and olefinic gases. By optimizing the internal optical structure and the external mechanical structure of the device and combining finite element simulation and experimental research, the miniaturized device is designed, and has a pressure-resistant and smashing-resistant high-strength shell and a window with waterproof, air-permeable and filtering functions; meanwhile, a control and processing system with high integration level is designed, and the internal volume of the device is minimized.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the invention constructs a device for in-situ detection analysis and remote communication of parameters of a coal mine underground closed environment, and provides technical support for monitoring the change of characteristic gas in the air-mining closed environment and researching that disaster early warning can be fed back in time by researching a small-size and high-sensitivity in-situ gas analysis spectrum technology and analyzing the change of the concentration of gas in the closed environment by combining the change characteristics of absorption spectral lines of all gases in the presence of gases with different concentrations from the requirement of monitoring and researching the concentration of spontaneous combustion gas of coal in the air-mining closed environment of a mine. The research results further facilitate monitoring and controlling of characteristic gas in the air seal, further overcome relevant key technologies of detection equipment for the sealed poisonous and harmful gas in the mine, participate in international competition, develop the international market, promote the technical development of deep equipment in China, and meet and support the requirement of the development of the national high-tech coal safety mining industry. The air extractor is passive, can provide power by a lead-acid battery, has small power consumption of an air extracting pump, particularly saves electricity, and reduces the danger of the device. Several groups of data can be obtained every day, a set of device is placed in each sealed wall, the inside of various sealed walls is analyzed, and batteries are replaced every two months. The vacuum pump has short air exhaust time each time, and is electricity-saving.
2. The underground geological conditions are complex, underground water is rich, a regional cable is easy to lose, corrosion and damage occur, the signal quality is not stable, and the mode of solving the mine signal transmission problem only through wired communication or wireless communication is very difficult, so that the transmission and acquisition of the gas signal in the airtight wall can be more accurately realized by adopting the mode of combining optical fiber communication and wireless communication. Meanwhile, according to the rapid integrated in-situ analysis method for the coal spontaneous combustion multi-component gas, the in-situ integrated accurate analysis of the coal spontaneous combustion multi-component gas in the air-collecting closed system is realized, and a key technical support is provided for the accurate detection of the high temperature point of the coal spontaneous combustion.
Drawings
FIG. 1 is a schematic view of the overall structure of the in-situ detection and remote monitoring analysis system for parameters of a closed environment under a mine.
Fig. 2 is a schematic structural diagram of the multi-gas in-situ detection and analysis device.
FIG. 3 is a flow chart of an in-situ detection and remote monitoring analysis system for spontaneous combustion parameters in a closed coal mine.
Detailed Description
As shown in fig. 1 and fig. 2, an in-situ detection and remote monitoring analysis system for parameters of a closed environment under a mine comprises a filtering type gas guide tube 1, a micro-power consumption direct-current negative pressure vacuum pump 2, a long-optical-path catadioptric absorption cell 3, a multi-element gas in-situ detection analysis device 4, an intrinsically safe power storage power supply module 5, an industrial ethernet communication system 6 and a ground remote monitoring and early warning center 7; the filtering type air guide pipe 1 is connected with the inner side and the outer side of the closed wall 8 through an observation hole and is used for sampling mixed gas in the air-collecting closed part; the micro-power consumption direct current negative pressure vacuum pump 2 is connected with the filtering type gas guide pipe 1 and is used for extracting gas in the closed space; the long optical path catadioptric absorption pool 3 is a closed space with two ends respectively provided with an air inlet 3-1 and an air outlet 3-2, is packaged by adopting nano-scale magnesium hydroxide, a modified aluminum hydroxide flame retardant or a light magnesium oxide flame retardant material, and three staggered reflectors 3-3 are arranged in the two ends to realize effective superposition of optical paths; the device is used for temporarily storing, analyzing and discharging the gas in the closed space extracted by the micro-power-consumption direct-current negative-pressure vacuum pump 2 to separate the component concentrations of the carbon oxygen gas and the olefin gas; the multi-component gas in-situ detection and analysis device 4 comprises a near-infrared light band light source transceiver 4-1, a light source drive integrated circuit 4-2, a phase-locked amplifier 4-3 and a central processing unit 4-4; the central processing unit 4-4 sends a detection signal to the light source driving integrated circuit 4-2; the light source driving integrated circuit 4-2 drives the near infrared light band light source transceiver 4-1 to emit light beams of different bands, and spectrum signals of coal spontaneous combustion multi-component index gases of different concentrations are obtained by multiple reflections of the light beams in the long optical path catadioptric absorption pool 3; the near-infrared light band light source transceiver 4-1 processes the spectrum signal through the lock-in amplifier 4-3 and then transmits the processed spectrum signal to the central processing unit 4-4 for analysis and storage; the central processor is connected with a 4-4 and a vacuum pump control circuit 2-1, and controls the micro-power consumption direct current negative pressure vacuum pump 2 to pump the closed gas to the long optical path catadioptric absorption cell 3; the central processor 4-4 is also connected with a remote communication control circuit 6-1, and the industrial Ethernet communication system 6 is used for transmitting the analysis result of the underground multi-component gas in-situ detection and analysis device 4 to a ground remote monitoring and early warning center 7; the intrinsic safety type power storage power supply module 5 supplies power to the micro-power consumption direct-current negative-pressure vacuum pump 2, the multi-gas in-situ detection and analysis device 4 and the industrial Ethernet communication system 6; the ground remote monitoring and early warning center 7 comprises a monitoring center station, a communication module, a display terminal and a server. The infrared band light source transceiver 4-1 is of a KYL850N300-60 type; the phase-locked amplifier 4-3 selects an AD630JNZ balanced modem chip; the central processing unit 4-4 selects MSP430F149 micro-power consumption single-chip microcomputer; all the parts are commercial mature products, and the application of the invention does not depart from the original application, and the details are not repeated.
The filtering type gas guide tube 1 is made of a mine flame-retardant polyethylene tube, and two ends of the filtering type gas guide tube are respectively provided with a filtering device for filtering solid impurities and high-humidity gas so as to reduce the influence on the light absorption pool; the airtight sampling hole is 300-400 mm away from the 8 top plates of the airtight wall, and the air guide pipe is connected with the inner side and the outer side of the airtight wall through the observation hole and used for sampling various gases in the airtight air sampling cavity.
The ethernet communication system 6 uses a combination of cable transmission and wireless radio frequency transmission to transmit information.
The micro-power consumption direct current negative pressure vacuum pump 2 selects a ZX 512-503-.
The ground remote monitoring and early warning center 7 comprises a monitoring center station, a communication module, a display terminal and a server. The monitoring central station is used for butting information transmitted by the underground closed in-situ detection and analysis device through the communication system; the communication module is used for data transmission between the ground monitoring center and the underground communication system, and the communication mode mainly carries out data transmission in a mode of combining wired and wireless modes; the display terminal is used for displaying the real-time state of the gas components and the concentration in the closed mine in real time; and the server is used for acquiring, storing, analyzing, early warning and displaying the gas information in the air extraction seal in the underground seal, and providing service for monitoring whether the information is normal or not.
The intrinsically safe storage power module 5 adopts a mining explosion-proof DTK30 type lead-acid storage battery, the voltage is 5V, the rated capacity is 30AH, and the size is small; the device is mainly used for supplying power to the underground micro-power consumption monitoring device, reducing the danger and being durable for a long time.
The micro-power consumption direct current negative pressure vacuum pump 2 is arranged at the air inlet end of the long-optical-path catadioptric absorption tank 3, the multi-gas in-situ detection and analysis device 4 is arranged at the air outlet end of the long-optical-path catadioptric absorption tank 3, and emits light beams through a near infrared light band light source transceiver 4-1 at the air outlet end of the multi-gas in-situ detection and analysis device; one of the three reflectors 3-3 is installed at the same side of the near infrared band light source transceiver 4-1, and the other two reflectors are installed at opposite sides thereof.
Example 1
Referring to fig. 3, it can be seen that the specific method for in-situ detection and remote monitoring analysis of spontaneous combustion parameters in the closed coal mine comprises the following steps: step 1) judging whether each monitoring module and communication are normal, judging the communication through a set handshake protocol, and analyzing the state of the monitoring module through a patrol result; if the multi-component gas is normal, the system is awakened to work, the air pump is triggered to pump out air, and meanwhile the multi-component gas in-situ detection and analysis device is started;
step 2) detecting whether the gas meets the detection requirement, judging whether the air pump continuously operates for 2min, and if so, starting a multi-gas in-situ detection and analysis device to perform detection and analysis; if not, the pumping of the air pump is triggered again to exhaust air;
step 2.1) detecting whether the near infrared light wave band light beam of the multi-element gas in-situ detection and analysis device is normally received and transmitted or not, and judging according to the dynamic signal change of the phase-locked amplifier; if yes, the detection is normally carried out, and if not, the alarm prompts to restart the detection device;
step 2.2) gas component separation and spectrum demodulation, correction and analysis, testing the absorption spectrum signals of the spontaneous combustion multi-component index gas of coal with different concentrations through experiments, verifying the spectral separation effect and the concentration detection sensitivity of the method for hydrocarbon gas with different concentrations, and studying and judging through the correction method:
in the formula, parameters v and alpha respectively represent the central position and the spectral line width of an absorption peak, and s is an undetermined coefficient related to the peak value of the absorption peak;
step 2.3) performing multiple sampling and result comparison analysis on the components of the air chamber, judging whether the error of the result of the three-time sampling in the air chamber is within 5%, if so, taking an average value, executing step 2.4), and if not, executing step 2.6);
step 2.4) analyzing results, and carrying out statistics and storage on the gas component data in the closed state;
step 2.5) a plurality of groups of data are arranged according to time and wait for sending;
step 2.6) carrying out repeated detection, iterating in the way, and carrying out multiple sampling, separation and statistics to determine an ideal result;
in the specific implementation process, the air pump completely replaces the gas in the absorption cell of the detection device within 2min, and then the in-situ detection device acquires n concentration data, and the average value of the n concentration data is used as the contrast concentration; repeating the measurement, recording the measured data result, and calculating the standard deviation S of the measurement result, wherein the calculation formula is as follows:
wherein C represents a concentration value of a target assay component; k represents the sampling times; respectively selecting multi-component standard gas to perform experimental test, analyzing the repeatability difference of experimental results, and checking the consistency of the measurement results of the system;
step 3) remotely monitoring whether the communication is normal; the parameters acquired from the ground and the handshake commands of the underground substations are researched and judged; if yes, transmitting the data of the step 2.4) and the step 2.6) to a monitoring center; if not, the remote monitoring center panel indicator lamp gives an alarm, and the step 2.1) is executed again;
and 4) displaying dynamic data in the closed environment by the monitoring center.
In the above, based on the parameters of the gas absorption spectral line given by the HITRAN database, such as line intensity, wavelength, broadening and the like, and combining the characteristics of the absorption spectral line, a multiple Lorentz linear function model of the absorption spectral line of the coal spontaneous combustion hydrocarbon gas molecules such as ethane, propane, ethylene and the like in the near infrared spectrum range is constructed, model parameters are obtained by a sparse decomposition algorithm, the separation of a background signal from the measured absorption spectral line is realized, and the absorption spectral line of the target gas to be measured is further obtained; the linear relation between the spectral line width and wavelength of the used light source and the driving current is tested, and the characteristics of narrow bandwidth, stable wavelength and the like of the light source are ensured. And testing the absorption spectrum signals of the coal spontaneous combustion multi-component marker gas with different concentrations, and verifying the spectral separation effect and the concentration detection sensitivity of the method on the hydrocarbon gas with different concentrations.
On the basis of multiple harmonic wave technology in wavelength modulation, CH under different concentration ratios is researched4CO and C2H4Spectral characteristics of the mixed gas, and a functional relation between a spectral fitting result and the concentration of the mixed gas is established by a multiband spectral line fitting and background deduction method to eliminate CH4For CO and C2H4Influence of gas high sensitivity detection; adopting an artificial neural network algorithm, and fitting different gas demodulation analysis methods under the mutual influence of multiple parameters such as concentration and the like; correction method under multi-parameter influence established based on multi-target particle swarm-extreme learning machine algorithm and aiming at characteristics of spectral line interferenceThe number of hidden layer neurons of the extreme learning machine is reduced, the generalization performance and the convergence speed of the network are improved, and different CH are verified through experiments4At concentration, the model is for CO and C2H4Accuracy of concentration demodulation; a concentration correction model of a nonlinear function relation is established by adopting a spectrum correction method, a concentration correction method and an algorithm based on an improved particle swarm optimization extreme learning machine, so that the overlapping separation of hydrocarbon gas absorption lines and the active correction of the interference of various gas absorption lines are realized, and the purposes of CO and C in coal spontaneous combustion multi-component gas2H4The object of highly sensitive detection.
By optimally designing the internal optical structure and the external mechanical structure of the device and combining finite element simulation and experimental research, the miniaturization of the device is achieved, and the device has a pressure-resistant and smashing-resistant high-strength shell and a window with waterproof, air-permeable and filtering functions; meanwhile, a control and processing system with high integration level is designed, so that the internal volume of the device is minimized; the laser controller and the phase-locked amplifier are adopted to compare the function and the performance of the designed circuit; designing an absorption cell with small volume and long optical path based on Herriott type and White type multiple reflection absorption cells; the design of a suspension light path of a gas chamber cavity is adopted, so that excellent vibration and temperature stability are obtained; by optimizing the light path structure and designing a highly stable optical machine packaging structure, the device can stably work in an air-collecting closed internal environment; the overall power consumption is reduced to the minimum by integrating the light source driving circuit and the data processing circuit, the power-on voltage change curves and the optimal battery discharge curves of different load systems are tested, the power management system is optimized, and the effective service life of the storage battery in an interval working mode is prolonged; the small-sized low-power consumption device is developed and suitable for in-situ analysis of coal spontaneous combustion multi-component gas in the air seal of coal mining.
Through the mode of combining optical fiber communication and wireless communication, relevant parameters of the gas in the sealing wall are transmitted to the coal mine ground monitoring center, the production process of a coal mine can be monitored in real time, the concentrations of coal spontaneous combustion index gases such as CO, CO2, CH4 and C2H2 in a plurality of seals can be known, the gas components in the seals can be analyzed and monitored, and the prediction and forecast of the spontaneous combustion condition of the coal in the air-producing seals can be further achieved.
Claims (9)
1. An in-situ detection and remote monitoring analysis system for parameters of a closed environment under a mine is characterized by comprising a filtering type air guide pipe, a micro-power consumption direct current negative pressure vacuum pump, a long-optical-path catadioptric absorption cell, a multi-gas in-situ detection and analysis device, an intrinsic safety power storage power supply module, an industrial Ethernet communication system and a ground remote monitoring and early warning center;
the filtering type air guide pipe is connected with the inner side and the outer side of the closed wall through the observation hole and is used for sampling mixed gas in the air-collecting closed wall;
the micro-power consumption direct current negative pressure vacuum pump is connected with the filtering type gas guide pipe and is used for extracting gas in the closed space;
the long optical path catadioptric absorption pool is a closed space with an air inlet and an air outlet at two ends respectively, is packaged by adopting nano-scale magnesium hydroxide, a modified aluminum hydroxide flame retardant or a light magnesium oxide flame retardant material, and three staggered reflectors are arranged at two ends to realize effective superposition of optical paths; the device is used for temporarily storing, analyzing and discharging the gas in the closed space extracted by the micro-power consumption direct current negative pressure vacuum pump, and separating the component concentrations of the carbon oxygen gas and the olefin gas;
the multi-gas in-situ detection and analysis device comprises a near-infrared light band light source transceiver, a light source driving integrated circuit, a phase-locked amplifier and a central processing unit; the central processing unit sends a detection signal to the light source driving integrated circuit; the light source driving integrated circuit drives the near infrared light band light source transceiver to emit light beams with different wave bands, and spectrum signals of coal spontaneous combustion multi-component index gas with different concentrations are obtained by utilizing multiple reflections of the light beams in the long-optical-path catadioptric absorption cell; the near infrared band light source transceiver transmits the spectrum signal to the central processing unit for analysis and storage after processing by the lock-in amplifier; the central processor is connected with a vacuum pump control circuit and used for controlling the micro-power consumption direct current negative pressure vacuum pump to pump the closed gas to the long-optical-path catadioptric absorption cell;
the central processor is also connected with a remote communication control circuit, and the industrial Ethernet communication system is used for transmitting the analysis result of the underground multi-gas in-situ detection and analysis device to a ground remote monitoring and early warning center;
the intrinsic safety type power storage power supply module supplies power to the micro-power-consumption direct-current negative-pressure vacuum pump, the multi-gas in-situ detection and analysis device and the industrial Ethernet communication system;
the ground remote monitoring and early warning center comprises a monitoring center station, a communication module, a display terminal and a server.
2. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the filtering type gas guide pipe is made of a mine flame-retardant polyethylene pipe, and the two ends of the filtering type gas guide pipe are provided with filtering devices for filtering solid impurities and high-humidity gas and reducing the influence on the light absorption tank; the distance between the sealed sampling hole and the top plate of the sealed wall is 300-400 mm.
3. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the Ethernet communication system adopts the combination of cable transmission and wireless radio frequency transmission to transmit information.
4. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the micro-power consumption direct-current negative-pressure vacuum pump selects a ZX 512-503-.
5. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the ground remote monitoring and early warning center comprises a monitoring center station, a communication module, a display terminal and a server.
6. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the intrinsic safety type power storage module adopts a mining explosion-proof DTK30 type lead-acid storage battery, the voltage is 5V, the rated capacity is 30AH, and the size is small; the device is mainly used for supplying power to the underground micro-power consumption monitoring device, reducing the danger and being durable for a long time.
7. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the monitoring central station is used for butting information transmitted by the underground closed in-situ detection and analysis device through the communication system;
the communication module is used for data transmission between the ground monitoring center and the underground communication system, and the communication mode mainly carries out data transmission in a mode of combining wired and wireless modes;
the display terminal is used for displaying the real-time state of the gas components and the concentration in the closed mine in real time;
and the server is used for acquiring, storing, analyzing, early warning and displaying the gas information in the air extraction seal in the underground seal, and providing service for monitoring whether the information is normal or not.
8. The in-situ detection and remote monitoring analysis system for parameters of the underground closed environment according to claim 1, characterized in that: the infrared band light source transceiver is of a KYL850N300-60 type; the phase-locked amplifier selects an AD630JNZ balanced modem chip; the central processing unit selects an MSP430F149 micro-power consumption singlechip.
9. The in-situ detection and remote monitoring analysis method for parameters of the closed environment under the mine by using the in-situ detection and remote monitoring analysis system as claimed in any one of claims 1 to 8 is characterized by comprising the following steps;
step 1), determining the arrangement position and the communication mode of an in-situ detection device of environmental parameters in the underground coal mine seal by combining the current situation and the requirement of the underground coal mine seal management, wherein the device is in a sleep state in a normal state for high efficiency and energy conservation, awakening once every 12 hours, sampling gas in the seal according to a set function, carrying out in-situ analysis on the components of the sampled gas, and transmitting the components to a ground remote monitoring analysis center through an industrial Ethernet communication system; the specific sampling process is as follows:
step 1.1), when an in-situ detection device for environmental parameters in underground closed environment is awakened, starting a micro-power-consumption direct-current negative-pressure vacuum pump to pump air, pumping air-collecting closed internal gas into a long-optical-path catadioptric absorption tank, replacing original gas in the long-optical-path catadioptric absorption tank through an exhaust process, closing the micro-power-consumption direct-current negative-pressure vacuum pump after all the gas in the long-optical-path catadioptric absorption tank is the air-collecting closed internal gas, and starting a multi-gas in-situ detection analysis device to analyze gas components;
step 1.2), after the multi-component gas in-situ detection and analysis device is started, light beams with different wave bands are emitted by a stable light source transceiver with a near infrared light wave band, the light beams are transmitted in multi-component mixed gas, and the light velocity is reflected for multiple times in a long-optical-path catadioptric absorption cell according to the absorption and reflection effects of different gases on the light beams with specific wave bands, so that the transmission time of the light velocity is delayed, and the precision and the effect of gas component analysis are improved;
step 1.3), in the process of separating and analyzing the multi-component gas components, adopting an artificial neural network algorithm to fit different gas demodulation and analysis methods under the mutual influence of multiple parameters of concentration, testing the absorption spectrum signals of the coal spontaneous combustion multi-component index gas with different concentrations through experiments, and verifying the spectral separation effect and the sensitivity of the method to the hydrocarbon gas with different concentrations, wherein the calculation formula is as follows:
in the formula, parameters v and alpha respectively represent the central position and the spectral line width of an absorption peak, and s is an undetermined coefficient related to the peak value of the absorption peak;
in the specific implementation process, the air pump completely replaces the gas in the absorption cell of the detection device within 2min, and then the in-situ detection device acquires n concentration data, and the average value of the n concentration data is used as the contrast concentration; repeating the measurement, recording the measured data result, and calculating the standard deviation S of the measurement result, wherein the calculation formula is as follows:
wherein C represents a concentration value of a target assay component; k represents the sampling times; respectively selecting multi-component standard gas to perform experimental test, analyzing the repeatability difference of experimental results, and checking the consistency of the measurement results of the system;
step 1.4), carrying out three-time gas component analysis in a short time by using an underground closed internal environment parameter multi-gas in-situ detection analysis device in order to improve the precision, wherein the analysis time of the device is ms grade, comparing detection results, taking an average value within the time that the deviation of three groups of data is less than 5%, carrying out repeated detection when the deviation is large, and iterating in the above way; after finishing a group of high-precision measurement data, transmitting the detection result of the in-situ detection device to a ground remote monitoring analysis center through an industrial Ethernet;
step 2), the ground remote monitoring and early warning center displays the underground acquired data on a terminal software platform and simultaneously stores the data in a preset database for historical data query; a closed disaster area early warning study and judgment model is built in the monitoring terminal software, and the sampled data is compared with a threshold value in the early warning study and judgment model in real time; when the monitoring result is within the threshold range, the ground remote monitoring and early warning center displays, refreshes and records the data in a normal state;
step 3), when the monitoring data of the ground remote monitoring and early warning center exceeds a threshold range, starting early warning by a system platform; issuing an instruction to the in-situ detection device of the environmental parameters in the underground closed system through the industrial Ethernet system, and triggering the sampling frequency of the in-situ detection device to be increased from once every 12 hours to once every 10 minutes; the system platform starts an early warning program, performs statistical analysis on remote monitoring data, fits a key index gas change curve, provides reference for making a fire prevention and extinguishing scheme, and improves the decision-making efficiency of abnormal early warning in the closed environment; and after the abnormality is eliminated, the normal state of the closed environment parameter in-situ detection and remote monitoring analysis system under the mine is automatically recovered.
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