A detection system for gas sensitive detection

Abstract

The present invention relates to a detection system for gas sensitive detection. The present invention is used in environments where danger may occur, such as mines. Specifically, the system includes a hazard source identification module that monitors hazard sources based on smell and / or sound, and a hazard elimination module that eliminates hazard sources in mine tunnels by wind or water power. The detection system includes a dispatching center, which controls the hazard elimination module to adopt a corresponding hazard elimination mode in response to changes in the hazard source residual amount provided by the hazard source identification module, wherein when the hazard elimination module continues to operate, the continuous increase in the hazard source residual amount provided by the hazard source identification module triggers the dispatching center to generate the first hazard report. By monitoring the gas or sound in the mine environment, the possible dangers in the mine can be reported in advance, thereby providing assistance for mine safety maintenance.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to a detection system for gas sensitive detection. Background Art

[0002] The working environment in the mine is complex. The prior art adopts a three-layer working method, including a gas layer reserved at the bottom, a transportation layer reserved for coal in the middle, and a mining layer above. The reserved gas layer is used to prevent underground water seepage from damaging personnel and mining equipment. Machines or workers collect minerals at the top mining layer. The collected minerals fall from the mining layer to the transportation layer along the channel between the transportation layer and the mining layer. The minerals in the transportation layer are transported to the ground by a conveyor belt. For example, a Chinese patent with publication number CN111768075A provides a method, equipment and medium for assessing the danger of people at risk during a mine flood. The method includes: determining the direct influencing factors that endanger people at risk during a mine flood; obtaining the actual conditions of the direct influencing factors in the mine flood; according to the actual conditions, quantitatively assessing the water flow danger, gas danger and passage danger to people at risk during the mine flood; and assessing the comprehensive danger to people at risk during the mine flood according to the water flow danger, gas danger and passage danger.

[0003] In addition to setting up a separate gas layer to prevent water seepage, the mining layer will also be densely equipped with dangerous gas detection devices. For example, the Chinese patent with publication number CN113240889B involves a dangerous gas hazard warning method and system for mines. The method includes: obtaining the dangerous gas concentration and gas flow data corresponding to each construction area and connecting channel; calculating the gas flow path corresponding to each construction area based on the gas flow data of the construction area and connecting channel and the map layout data of the mine; predicting the gas intersection point of dangerous gases between different construction areas based on the gas flow path and dangerous gas concentration of each construction area, and the dangerous gas concentration of each connecting channel; then when the dangerous gas intersection concentration at the corresponding gas intersection point is greater than or equal to the set dangerous concentration threshold, the corresponding gas intersection point is used as a dangerous intersection point.

[0004] However, even with multiple protective measures in place, accidents have occurred frequently in mines in recent years. The perception of danger in mines is mainly divided into prediction and real-time detection.

[0005] Danger prediction mainly involves: by scanning the environment under the mine, the intelligent system predicts the probability of danger occurring during the operation. For example, the Chinese patent with publication number CN113240889B relates to a dangerous gas hazard warning method and system for mines. The method includes: obtaining the dangerous gas concentration and gas flow data corresponding to each construction area and connecting channel; calculating the gas flow path corresponding to each construction area based on the gas flow data of the construction area and connecting channel and the map layout data of the mine; predicting the gas intersection point of dangerous gases between different construction areas based on the gas flow path and dangerous gas concentration of each construction area, and the dangerous gas concentration of each connecting channel; then when the dangerous gas intersection concentration at the corresponding gas intersection point is greater than or equal to the set dangerous concentration threshold, the corresponding gas intersection point is used as a dangerous intersection point.

[0006] Real-time detection mainly includes: monitoring the working environment through visual sensors, sound sensors, odor sensors, etc. When the working environment judged based on the detection data reaches the set danger level, the system will send a danger alarm. For example, the Chinese patent with publication number CN213303256U provides a gas pressure monitoring and danger alarm device in a coal mine. The gas monitoring and danger alarm device in a coal mine includes a base, a current limiting part is connected to the upper surface of the base, a guide tube and an air inlet pipe are installed on the outside of the current limiting part, the current limiting part is connected to a hydraulic cylinder, a piston rod is sleeved in the hydraulic cylinder, the piston rod is connected to a pressure sensor, a connecting plate and a display screen are fixed on the outside of the hydraulic cylinder, a connecting plate is connected to a screw, a screw is sleeved with a sleeve and a nut, and the sleeve is connected to a gas concentration detector through a placement rack.

[0007] The mine operating environment is complex. The prediction method of dangerous sources in the environment through intelligent systems will produce large errors and is not reliable. Real-time detection has a lag when danger comes. When it is detected that the gas content in the environment reaches a dangerous level or a fire / flood occurs, the evacuation of personnel and equipment takes a lot of time. Accidents during the evacuation will have unpredictable consequences, such as spark explosions.

[0008] In view of the hysteresis of danger alarm, the present invention forms at least two danger alarms based on the detection number curve of continuous time points, thereby providing a safe evacuation environment and a longer evacuation time for the evacuation of personnel and equipment in the mine when danger may occur.

[0009] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the applicant studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background technology. Summary of the invention

[0010] In the prior art, the gas concentration in the mine operation area is mainly monitored by methane alarms installed at fixed points. When the gas concentration reaches 0.8%, the dispatching system will issue an evacuation alarm. However, in the actual operation process, due to the large number of personnel and the limited carrying capacity of the mine, the evacuation time is long. The gas concentration leakage occurs quickly. Dust and other conditions in the operation area further reduce the lower limit of the gas explosion concentration. When the methane alarm directly detects that the gas concentration in the environment reaches 0.8%, the reduced minimum gas explosion concentration and evacuation efficiency make the time to allow personnel to leave the mine safely urgent.

[0011] In view of the shortcomings of the prior art, the present invention provides a detection system for gas sensitive detection, including a hazard source identification module for monitoring hazard sources based on smell and / or sound and a hazard elimination module for eliminating hazard sources in mine tunnels by wind or water power. The detection system includes a dispatching center, which controls the hazard elimination module to adopt a corresponding hazard elimination mode in response to changes in the hazard source residual amount provided by the hazard source identification module, wherein when the hazard elimination module continues to operate, the continuous increase in the hazard source residual amount provided by the hazard source identification module triggers the dispatching center to generate the first hazard report.

[0012] During the operation of the exhaust module, the gas concentration in the mine can be suppressed to an extremely low concentration (for example, 0.01%). Even during the operation, the gas concentration in the mine can remain at 0. The gas outburst is uneven. When a gas leak occurs in the mine, the ventilation work of the exhaust module may have an effect on reducing the gas concentration in the mine in the early stage of the leak. When a large amount of gas leakage occurs, the gas concentration in the environment will not suddenly increase, but will gradually increase as the leakage occurs. When the exhaust module works at maximum power, the gradually increasing amount of gas leakage will still accumulate in the mine. On the one hand, the detection system of the present invention can adjust the danger elimination mode of the danger elimination module based on the detected gas concentration; on the other hand, after the danger elimination module works at maximum power, if the hazard source identification module can still detect the hazard source (for example, gas), and the degree of harm of the hazard source to personnel gradually increases (for example, the gas concentration gradually increases), even if the gas concentration does not reach 0.8%, the dispatch center can generate the first hazard report based on the increase in the residual amount of the hazard source provided by the hazard source identification module. The first hazard report can be used to provide an alarm to ground dispatchers, so that ground dispatchers can increase the monitoring frequency of underground mines. The first hazard report can also be sent to patrol personnel in the mine, and the patrol personnel will inspect the area based on the gas accumulation area included in the first hazard report, and confirm whether to evacuate immediately through the patrol personnel's analysis.

[0013] According to a preferred embodiment, the first hazard report includes the specific occurrence area of ​​the detected hazard source residue. The specific occurrence area of ​​the hazard source residue is known by locating the hazard source identification module set at an independent fixed point. Since the hazard source residue is low, maintenance can be given the first priority. The first hazard report can be sent to ground dispatchers, mine inspections and relevant safety personnel at the same time. Based on the first hazard report received, the inspection personnel can rush to the location in priority to check and repair the location where the hazard source is generated.

[0014] According to a preferred embodiment, based on the accumulation speed of the hazardous source residue, the dispatch center can also predict the increase in gas concentration and the time node of the 0.8% concentration required for evacuation. Specifically, the time when the hazard elimination module switches to maximum power operation is taken as the first node, and the hazardous source identification module detects the hazardous source residue at least at two time points, namely the first node and the second node separated from the first node by a preset interval. Preferably, the preset interval can be 1 to 5s. When the hazardous source residue at the second node is higher than the hazardous source residue at the first node, the dispatch center starts to check the hazardous source residue at preset intervals. T is a time node, specifically, T0 is the first node, T2 is the second node, and so on, the last time node is T n , the preset interval between each time node is the same. F is the residual amount of the hazardous source. Specifically, F0 is the residual amount of the hazardous source at the first node, F2 is the residual amount of the hazardous source at the second node, and so on. The residual amount of the hazardous source measured at the last time node is F n M is the maximum discharge of the danger source inside the mine by the danger removal module. m The time when the residual amount of the hazardous source predicted by the system reaches the hazardous value range specified by the state. m The minimum residual amount of hazardous sources in the mine as stipulated by the state. As shown in the following formula, the time T when the residual amount of hazardous sources reaches the hazardous value range stipulated by the state is obtained. m .

[0015]

[0016] By collecting the residual amount of the hazard source at multiple time nodes, the time node of the hazard occurrence is obtained. On the one hand, the dispatch center provides a time limit so that personnel can be alert and dispatch inspection personnel to check the location where the hazard occurs; on the other hand, if the time limit is relatively short, or the inspection personnel believe that the hazard source is uncontrollable, the ground dispatch can arrange personnel to evacuate in time and selectively arrange and arrange the equipment underground based on the time limit to reduce property losses and personnel losses.

[0017] According to a preferred embodiment, the first threshold value can be a range of values ​​of the residual amount of the hazardous source in the prescribed safety code.m It can be the first threshold. For example, although the gas explosion limit is 5% to 16%, due to the complexity of the mine working environment, the coal mine safety regulations stipulate that the gas concentration shall not exceed 1%. Based on this, the value of the first threshold is not greater than 1%.

[0018] According to a preferred embodiment, the hazard elimination module includes a ventilation unit and a water spray unit. The ventilation unit can promote the air flow within the working layer of the mine, thereby accelerating the air exchange inside and outside the mine, ensuring the oxygen concentration within the working layer of the mine and the discharge of harmful gases. The water spray unit is mainly used for dust spraying and auxiliary fire fighting work in the early stage of a fire. Mine ventilation can deliver enough fresh air to the underground to supply the oxygen needed for breathing for underground personnel. Mine ventilation can also discharge the air diluted with harmful gases and mine dust to the ground, ensuring the air quality underground and limiting the concentration of mine dust to a safe range. After the fresh air is delivered underground, it can adjust the climatic conditions of the underground tunnels and workplaces to meet the requirements of wind speed, temperature and humidity specified underground, and create a good working environment.

[0019] According to a preferred embodiment, in response to the residual amount of the hazard source provided by the hazard source identification module reaching a first threshold, the dispatch center generates a second hazard report on the hazard level in the mine tunnel under the triggering state of the hazard elimination module.

[0020] According to a preferred embodiment, the dispatch center controls the danger elimination module to change the danger elimination mode based on the danger elimination mode of the danger elimination module which is proportional to the residual amount of the danger source, so that the danger elimination module can adjust the danger elimination mode for eliminating the danger source based on the concentration change of the danger source in the environment. When the residual amount of the danger source continues to increase, the danger elimination module changes the danger elimination mode, changing the low-efficiency danger elimination mode to a high-efficiency danger elimination mode, so as to improve the danger elimination efficiency of the danger elimination module in the mine environment.

[0021] According to a preferred embodiment, when the hazard identification module identifies that the residual amount of hazardous sources in the mine is 0, the dispatching center controls the hazard elimination module to change the hazard elimination mode. After the hazard elimination module reduces its working efficiency, the hazard identification module identifies the residual amount of hazardous sources again, and the dispatching center generates a third hazard report. The third hazard report is based on the occurrence of small-scale hazardous sources. The third hazard report contains prediction results and detection results. The detection result is the residual amount of hazardous sources corresponding to the hazard elimination mode currently applied by the hazard elimination module. The prediction result is the location where the hazardous source may occur, which is used to assist inspectors in detecting and repairing the location where the hazardous source occurs.

[0022] According to a preferred embodiment, mines are divided into three safety levels based on different hazard reports.

[0023] The first safety level for maintenance purposes based on the first hazard report is sent to ground dispatchers and employees in the mine with safety responsibilities. The first safety level is used to call one or several inspectors who are closest to the location of the detected hazard. Mines at the first safety level are low-risk environments, and human efforts are prioritized to eliminate hazard sources. Inspectors are called nearby so that the hazard source can be quickly eliminated. Preferably, the first hazard report contains the specific area where the hazard source residue occurs, so as to provide priority inspection locations for mine inspectors.

[0024] The second safety level formed based on the third danger report, with the purpose of evacuating workers and inspectors going to the dangerous source area for repairs, is sent to ground dispatchers and employees with safety responsibilities in the mine. Mines at the second safety level have the possibility of danger, but the danger sources are still accumulating. After eliminating the dangers caused by equipment operation and personnel operation, the danger can still be eliminated based on manual inspection and maintenance. Due to the increase in the residual amount of dangerous sources, the third danger report can be sent to the personal terminals of all employees related to mine safety in the mine or on the ground, so that employees related to the mine safety can centrally repair the dangerous source area, speed up the repair progress, and avoid further expansion of the dangerous source.

[0025] The third safety level formed based on the third danger report is sent to the ground dispatcher for the purpose of organizing the evacuation of employees in the mine. Based on the mine entering the third safety level, the ground dispatcher sends an evacuation notice to the mine to ensure the safety of personnel underground. The ground dispatcher can also independently choose to cut off related equipment in the mine to prevent sparks generated by equipment operation from igniting / detonating dangerous sources in the mine.

[0026] According to a preferred embodiment, the hazard source identification module can perform hazard source detection again after the hazard elimination module completes the procedure of the changed hazard elimination mode, and the dispatch center cancels the hazard warning triggered by the first hazard report in response to the continuous decrease in the hazard source residual amount provided by the hazard source identification module and the decrease to a second threshold.

[0027] According to a preferred embodiment, the hazard source identification module includes a MEMS microphone device encapsulating an olfactory sensor and a MEMS pickup unit to realize the recognition of the sound / smell of the mine hazard source. The olfactory sensor and the MEMS pickup unit circuit are connected in parallel. The shell on the surface of the MEMS microphone device for encapsulating the olfactory sensor and the MEMS pickup unit is provided with air holes. The air holes are used to facilitate sound waves and gas to contact the olfactory sensor and the MEMS pickup unit.

[0028] According to a preferred embodiment, the olfactory sensor and the MEMS sound pickup unit are connected in parallel to a data processing unit. The data processing unit is provided with an operational amplifier module and a signal conversion module, wherein the operational amplifier module and the signal conversion module can convert the signal type collected by the olfactory sensor and the MEMS sound pickup unit into the same type as the signal type processed by the back-end device when the data processing unit is enabled.

[0029] According to a preferred embodiment, the danger source includes at least underground abnormal gas, underground water and underground fire. The detection results of the MEMS sound pickup unit and the olfactory sensor are transmitted to the dispatching center through signal conversion by the data processing center, providing the dispatching center with danger warning data.

[0030] According to a preferred embodiment, when underground water leakage occurs, the rotten smell in the underground water can be sensed by the olfactory sensor, and the sound of the water flow can be sensed by the MEMS pickup unit. When an underground fire breaks out in the mine, the smoke generated by the underground fire can be sensed by the olfactory sensor, and the sound generated by the burning object can be sensed by the MEMS pickup unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of one implementation of the system in a mine;

[0032] Figure 2 It is a schematic diagram of the identification direction of the hazard source identification module provided by the present invention. DETAILED DESCRIPTION

[0033] The following is a detailed description with reference to the accompanying drawings.

[0034] Gas leakage is the most common mine disaster. Gas is colorless and odorless, difficult to dissolve in water, does not support combustion and cannot sustain breathing. The main component of gas is alkane. When the gas reaches a certain concentration, it can cause people to suffocate due to lack of oxygen, and cause combustion or explosion. According to national regulations, when the gas concentration in the coal seam of a mine exceeds 1%, there is a risk of explosion or human poisoning. When the gas concentration exceeds 1%, employees are required to stop working and evacuate.

[0035] Example 1

[0036] The present invention provides a detection system for gas sensitive detection, comprising a hazard source identification module for monitoring hazard sources based on smell and / or sound, and a hazard elimination module for eliminating hazard sources in mine tunnels by wind or water power. The detection system comprises a dispatching center, which controls the hazard elimination module to adopt a corresponding hazard elimination mode in response to changes in gas concentration provided by the hazard source identification module, wherein when the hazard elimination module continues to operate, the continuous increase in the hazard source residue provided by the hazard source identification module triggers the dispatching center to generate a first hazard report. Preferably, the hazard elimination module can be an exhaust unit. The hazard elimination mode is different fan speeds of the exhaust unit. For example Figure 1 As shown, the system can be installed at the top of a mine to monitor the gas in the mine environment in real time.

[0037] According to a preferred embodiment, before the exhaust unit reaches the maximum power, the fan speed of the exhaust unit is in an adjustable mode. When the hazard source identification module identifies the presence of gas in the mine and the gas concentration increases, the fan speed continues to increase until the gas concentration identified by the hazard source identification module no longer increases, at which point the fan speed remains unchanged. The safety level classification method is: based on the content of the hazard report, a safety level is generated for the purpose of inspection and / or arranging personnel evacuation.

[0038] According to a preferred embodiment, in response to the gas concentration provided by the hazard source identification module reaching 0.8%, when the exhaust unit is at maximum power, the dispatch center generates a second hazard report on the hazard level in the mine tunnel. The second hazard report is sent to the ground dispatch and notified to the ground dispatch in a conspicuous manner to attract the attention of the ground dispatch. When an accident occurs in the mine and the second hazard report is not sent to the ground, the dispatch center has the authority to issue a warning notification to all covered areas in the mine.

[0039] According to a preferred embodiment, when a gas leak occurs in a mine, the pressure on the roof of the working face in the mine increases, the coal wall is squeezed, and a sound of gas gushing out of the gap is generated in the mine, such as a "hissing". The hazard source identification module is provided with a MEMS pickup unit for identifying sound. When the dispatch center discovers the presence of gas in the mine environment based on the smell collected by the olfactory sensor, the MEMS pickup unit starts working. The MEMS pickup unit collects the sound in the mine in real time and transmits it to the dispatch center. When the dispatch center determines that the monitored sound characteristics meet the set conditions based on the sound wave signal comparison, the dispatch center can directly send a second hazard report to the ground dispatch. Preferably, the set conditions include sound signals flowing under different conditions.

[0040] The situations in which gas appears in mines are mainly divided into gas extraction pipeline damage, leakage from gaps in the working surface in the mine, and infiltration from the working surface in the mine. Whether the gas leaks from the pipeline or from the cracks, abnormal sounds will be generated due to the rapid flow of gas in the gaps. When the MEMS pickup unit collects abnormal sound wave signals, it indicates that the gas pressure in the working surface / gas extraction pipe is high and the gas leakage is urgent. Even if the gas concentration detected by the olfactory sensor does not reach 0.8% or above, the dispatch center still sends a second danger report to the ground dispatch. The ground dispatcher decides whether to initiate an alarm based on the judgment of the mine. The simultaneous monitoring of sound and smell, on the one hand, improves the sensitivity of gas detection; on the other hand, it makes up for the errors that may be caused by the detection of gas by a single sensory organ.

[0041] For example, when personnel are working in a mine, the olfactory sensor detects the presence of gas in the mine, and the olfactory sensor triggers the MEMS sound pickup unit. The MEMS sound pickup unit starts working. The MEMS sound pickup unit collects sound signals in the mine, and extracts the frame energy value of the collected sound signals through the data processing unit. The extracted sound frame energy is identified and matched with the sound frame energy fingerprint library. If the matching result meets the set conditions, the dispatch center generates a second danger report, and the olfactory sensor remains in working condition. The second danger report generated based on the MEMS sound pickup unit can include the location information of the danger source identification module that senses the sound, so as to facilitate the operators to avoid when traveling in the mine or the patrol personnel to repair the gas leakage location.

[0042] When the gas concentration reaches 0.8% or above, there is a risk of combustion or explosion in the mine. After the dispatch center generates the second hazard report, the olfactory sensor and MEMS pickup unit work synchronously to monitor the environment inside the mine to facilitate the ground dispatch to arrange the order of personnel evacuation.

[0043] Specifically, when the gas concentration reaches 0.8% or above, the ground dispatch receives the second danger report provided by the dispatch center and begins to organize the evacuation of personnel. During the evacuation process, the dispatch center obtains areas with different gas concentrations sensed by the olfactory sensor, and takes the area with the highest concentration as the first area, and so on in order. Since the capacity of the elevator from the ground to the underground is prioritized, it is necessary to direct personnel to a safer area to wait for the elevator. During the evacuation process, the ground dispatch directs the personnel in the first area through the terminal equipment carried by the personnel to ensure that the personnel in the area are quickly evacuated to other safe areas with lower gas concentrations. When the MEMS pickup unit recognizes the sound of the precursor to the explosion (for example, the "hissing" sound of air flow), the area where the hazard source identification module currently containing the MEMS pickup unit is located is the first priority for evacuation, and the ground dispatch focuses on directing the transfer of non-evacuated personnel in the area to a safe area.

[0044] Based on the second hazard report sent by the dispatch center, the concentration of the hazard source detected by the hazard source identification module is regionally classified, and the hazard source radiation area at least includes the first area with the highest concentration, the second area with the second highest concentration, and the third area with the lower concentration, wherein the concentration of the hazard source in the first area meets the conditions for explosion or combustion, the concentration of the hazard source in the second area does not meet the conditions for explosion or combustion but will cause stress response in the human body, and the concentration of the hazard source in the third area does not meet the conditions for explosion or combustion and will not cause irreversible damage to people. For example, the hazard source identification module identifies that the current gas concentration reaches 0.8% or the hazard source identification module identifies the sound of gas leakage, and the ground dispatch receives the second hazard report sent by the dispatch center. The ground dispatch organizes the evacuation of personnel. When no other information is received, the ground dispatch uses the area where the hazard source identification module that identifies the gas is located as the first area to be commanded to evacuate. The gas concentration detected by the hazard source identification module is regionally classified, and is at least divided into the first area with the highest concentration, the second area with the second highest concentration, and the third area with the lower concentration. The ground dispatch directs the personnel in the first area to move to the third area and monitors the information presented to the dispatch center by the hazard source identification module. When the hazard source identification module detects a hazard (explosion, flame, etc.) in the first area, it further refines the first area, plans a harmless evacuation route, directs people in the first area to evacuate to the safe third area as quickly as possible, and waits for the elevator to transport the people to the ground.

[0045] According to a preferred embodiment, the change in gas concentration is proportional to the change in the fan speed of the air exhaust unit. When the gas concentration continues to increase, the air exhaust unit increases the fan speed. During the operation, there may be a small amount of gas flow in some mining working faces. In order to avoid false alarms of gas, the gas concentration is reduced by increasing the fan speed of the air exhaust unit, providing time for the dispatch center to generate a danger report and respond and detect.

[0046] According to a preferred embodiment, when the exhaust unit increases or decreases the fan speed, the hazard source identification module can detect the gas concentration of the mine environment again. When the gas concentration detected by the hazard source identification module continues to decrease and drops to a second threshold, the dispatch center cancels the hazard warning triggered by the first hazard report.

[0047] According to a preferred embodiment, the forms of danger warnings triggered based on different danger reports are different. Since the situation in the mine presented by the second danger report is urgent and the most dangerous, the danger warning triggered by the second danger report is displayed at the ground dispatch in the most eye-catching and reminder way. Preferably, the danger warning triggered by the second danger report can be displayed to the ground dispatch in a combination of flashing red alarm lights and sounding alarms. The first danger report and the third danger report are displayed to the ground dispatch in the form of different colored alarm lights. Preferably, the first danger report is displayed to the ground dispatch in a flashing yellow alarm light. The third danger report is displayed to the ground dispatch in a flashing yellow alarm light.

[0048] According to a preferred embodiment, when making the first danger report, the dispatch center can predict the time node where the danger may occur based on the recorded data. When the power of the air exhaust unit is increased to the maximum, the danger source identification module detects that the gas concentration has increased, and the dispatch center generates the first danger report.

[0049] Based on the detection of gas concentration at different time nodes, the dispatch center obtains a time node based on the following formula, which is the time required for the gas to reach a dangerous concentration (above 0.8%). T' represents each time node of gas detection. Specifically, T0' is the first time node of gas detection, T2' is the second time node of gas detection, and so on. The time node of the last gas detection is T n ', the preset interval between each time node is the same. F' is the gas residual concentration in the mine detected by the hazard source identification module. Specifically, F0' is the gas residual concentration at the first time node, F1' is the gas residual concentration at the second time node, and so on. The gas residual concentration measured at the last time node is F n M' is the maximum gas discharge from the exhaust unit to the mine. m ' is the time when the residual gas concentration predicted by the system reaches the dangerous value range specified by the state. m ' is the minimum residual concentration of gas in the mine specified by the state. As shown in the following formula, the time T when the gas reaches the dangerous value range specified by the state is obtained m '.

[0050]

[0051] By introducing the above formula, the time point of danger occurrence is predicted based on the information collection of at least three time nodes. The predicted time length provides priority options for personnel evacuation and equipment protection in the mine, that is, the ground dispatcher can choose to directly evacuate personnel or leave some personnel behind to adjust equipment based on the length of time, thereby providing a reliable time arrangement for the dispatcher in the mine and avoiding unnecessary losses of personnel or finances.

[0052] According to a preferred embodiment, the hazard identification module is set at the top of the mine and can monitor the odor in the detection area covered by it in three dimensions. A three-dimensional coordinate axis is established with the hazard identification module as the center. Figure 2 As shown, the hazard identification module can detect the gas concentration in a linear direction within the coordinate axis. Specifically, the hazard identification module detects the gas concentration in at least three linear directions within the coordinate axis through sensors arranged 360° circumferentially. Based on the detection results of different concentrations in the three directions, the dispatch center generates an area, which is formed by biasing the detection sites with higher concentrations on the x, y and z coordinate axes. Preferably, the coverage space of the hazard identification module can be divided into eight quadrants. For example, the detection point of 0.1% gas concentration is in the first quadrant, the detection point of 0.3% gas concentration is in the second quadrant, and the detection point of 0.15% gas concentration is in the third quadrant. The location where the gas leakage occurs can exist near the second quadrant of the coverage area of ​​the hazard identification module.

[0053] When the first hazard report or the third hazard report is sent to the inspectors, the inspectors can first identify the location of the hazard source in the mining layer, gas layer or transportation layer under the mine, as well as the approximate location at a certain depth of a certain layer, by detecting the location of a single or several hazard identification modules that detect the hazard source. Furthermore, the inspection personnel's detection location priority is narrowed by predicting the location of the gas leak through one or several hazard identification modules. The inspectors will give priority to inspecting the location based on the predicted location of the gas leak contained in the first hazard report or the third hazard report. Through the hazard reports sent by the dispatch center, the inspectors can shorten the time to investigate the gas leak location.

[0054] Example 2

[0055] The system can also integrate the hazard source identification module into the handheld terminal devices of underground personnel. Underground personnel are mainly divided into two categories: operators and inspectors. When the hazard source identification module is integrated into the handheld terminal devices of different underground personnel, different hazard warning and hazard source investigation effects can be achieved.

[0056] Operators: The hazard source identification module can collect sounds and smells in the underground environment. When a hazard occurs underground, especially taking gas leakage as an example, the hazard source identification module collects the gas smell in the environment, so that the dispatch center that receives the gas information (based on the needs of rapid signal processing and transmission, especially when the signal is weak underground, the dispatch center used to process the information provided by the hazard source identification module can be integrated with the hazard source identification module on the handheld device of the personnel) can promptly judge the gas concentration in the environment and the relative position of the gas leakage source and the operator. When the operator moves the handheld terminal device, the closer to the location of the gas leakage, the higher the gas concentration. The dispatch center adjusts the volume of the warning sound played to the operator based on the increase in gas concentration, that is, the closer the operator is to the location of high gas concentration, the louder the volume of the warning sound. When the hazard source identification module obtains the sound of gas leakage based on sound recognition, on the one hand, the dispatch center can send an alarm to the operator near the leakage location based on the handheld device terminal to remind the operator to wait for rescue on the spot, prohibit actions that may cause sparks or move away from the leakage location; on the other hand, the dispatch center can also send information to the ground dispatch center and the inspection personnel closest to the leakage location based on the leakage information obtained, so that the ground dispatch center can take countermeasures in time. The operator can sense the danger underground at the first time through the hazard source identification module and the dispatch center integrated on the handheld device terminal. When a dangerous gas (gas) leaks, the escape route is determined based on the volume of the alarm sound, that is, when the alarm volume is louder during the escape process, the gas concentration is stronger, and the operator can change the escape direction in time to prevent approaching the dangerous location.

[0057] Patrol personnel: When the current environment is at the first safety level or the second safety level, patrol personnel who hold a combined hazard source identification module and equipment from the dispatch center can approach the leakage location based on the alarm issued by the dispatch center, that is, the patrol personnel move in the direction where the alarm volume becomes louder. When the hazard source identification module collects sounds related to hazardous gas leakage in the environment, patrol personnel on the handheld device terminal can conduct inspections and repairs based on the clear sound propagation direction provided by the equipment.

[0058] According to a preferred embodiment, the method for prompting the change of dangerous gas concentration includes but is not limited to the alarm volume (the volume becomes larger or smaller when the concentration increases), the brightness change of the terminal alarm light color, and the color change of the alarm light. The alarm module for prompting danger is integrated into the handheld device terminal. The handheld device terminal can be a mobile phone, a pager, an intercom, a PC or a tablet.

[0059] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the present invention specification and its drawings are illustrative and do not constitute a limitation of the claims. The scope of protection of the present invention is defined by the claims and their equivalents. The present invention specification contains multiple inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", all of which indicate that the corresponding paragraph discloses an independent concept, and the applicant reserves the right to file a divisional application based on each inventive concept. Throughout the text, the feature guided by "preferably" is only an optional method and should not be understood as a must-have setting. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A detection system for gas sensitive detection, comprising a hazard source identification module for monitoring hazard sources based on smell and sound and a hazard removal module for removing hazard sources in mine tunnels by wind or water, characterized in that: The detection system includes a dispatching center, which controls the hazard elimination module to adopt a corresponding hazard elimination mode in response to the change of the hazard source residual amount provided by the hazard source identification module. in, When the hazard elimination module continues to operate, the continuous increase in the residual amount of the hazard source provided by the hazard source identification module triggers the dispatch center to generate the first hazard report. When the hazard source identification module is integrated on the handheld terminal devices of different underground personnel, different hazard warning and hazard source investigation effects can be achieved. Among them, the inspection personnel will give priority to the location of the predicted gas leakage occurrence based on the location contained in the first hazard report; In response to the hazard source residual amount provided by the hazard source identification module reaching a first threshold, the dispatch center generates a second hazard report on the safety level in the mine tunnel under the triggering state of the hazard elimination module; wherein, The hazard source identification module is provided with a MEMS sound pickup unit for identifying and monitoring the sound of leaked gas. When the dispatch center finds that there is gas in the mine environment based on the smell collected by the olfactory sensor, the MEMS sound pickup unit starts working; the MEMS sound pickup unit collects the sound in the mine in real time and transmits it to the dispatch center; When the dispatch center determines that the monitored sound characteristics meet the set conditions based on the sound wave signal comparison, that is, the MEMS pickup unit collects abnormal sound wave signals indicating that the gas pressure in the working surface / gas extraction pipe is high and the gas leakage is urgent, even if the gas concentration detected by the olfactory sensor does not reach 0.8% or above, the dispatch center can directly send a second danger report to the ground dispatch and choose whether to initiate an alarm based on the ground dispatch's judgment of the mine. Among them, the second danger report generated based on the MEMS pickup unit contains the location information of the danger source identification module that senses the sound, so as to facilitate the workers to avoid when moving in the mine or the inspection personnel to repair the gas leakage location.

2. The system according to claim 1, characterized in that The dispatch center controls the hazard elimination module to change the hazard elimination mode based on the hazard elimination mode of the hazard elimination module which is proportional to the residual amount of the hazard source, so that the hazard elimination module can adjust the hazard elimination mode for eliminating the hazard source based on the concentration change of the hazard source in the environment.

3. The system according to claim 1 or 2, characterized in that: Based on the second danger report sent by the dispatch center, the ground dispatch classifies the areas of danger source radiation according to the danger source concentration provided by the danger source identification module, wherein the areas of danger source radiation include at least a first area with the highest concentration, a second area with the second lowest concentration, and a third area with the lowest concentration. The danger source concentration in the first area meets the conditions for explosion or combustion, the danger source concentration in the second area does not meet the conditions for explosion or combustion but will cause a stress response in the human body, and the danger source concentration in the third area neither meets the conditions for explosion or combustion nor causes irreversible harm to humans.

4. The system according to claim 3, characterized in that The hazard source identification module can perform hazard source detection again after the hazard elimination module completes the procedure of the changed hazard elimination mode. The dispatch center cancels the hazard warning triggered by the first hazard report in response to the continuous decrease of the hazard source residual amount provided by the hazard source identification module and its decrease to the second threshold.

5. The system according to claim 4, characterized in that The safety level is graded in such a way that, based on the content of the danger report, a safety level for the purpose of inspection and / or arranging for evacuation of personnel is generated.

6. The system according to claim 5, characterized in that The first hazard report contains the specific occurrence area of ​​the hazard source residue, so as to provide priority inspection locations for mine inspectors.

7. The system according to claim 6, characterized in that The danger sources at least include abnormal underground gas, underground water and underground fire.

8. The system according to claim 7, characterized in that The first threshold value can be a value range of the hazardous source residual amount in the prescribed safety code.

9. The system according to claim 8, characterized in that The hazard source identification module includes a MEMS microphone device encapsulating an olfactory sensor and a MEMS pickup unit to realize the recognition of the sound / smell of the mine hazard source.

10. The system according to claim 9, characterized in that The hazard elimination module comprises a ventilation unit and a water spray unit, wherein the ventilation unit can accelerate the air flow in the mine to reduce the residual amount of gaseous hazardous sources in the mine.

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