Full-laser multi-path gas fire early warning monitoring system and fire early warning method

Abstract

The invention discloses a full-laser multi-path gas fire early warning and monitoring system and a fire early warning method, the fire early warning and monitoring system comprises a ground monitoring part and an underground monitoring part, and the ground monitoring part comprises a ground monitoring server host; the underground monitoring part comprises a gas monitoring module, a network switch, a sucking pump, a beam tube switching valve group and a plurality of sampling beam tubes, the gas inlet end of the sucking pump is communicated with an exhaust pipe of the beam tube switching valve group, and the exhaust end of the sucking pump is communicated with the gas monitoring module; the beam tube switching valve group comprises a plurality of switching valves in one-to-one correspondence with the sampling beam tubes, the air inlet end of each switching valve is communicated with the corresponding sampling beam tube, and the exhaust end of each switching valve is communicated with an exhaust pipe; a gas reversing valve is arranged on the exhaust pipe, a pressure sensor and a compressed gas source control valve communicated with the gas reversing valve are arranged on the gas reversing valve, and the compressed gas source control valve is communicated with a compressed gas tank.

Description

Technical Field

[0001] The invention relates to the field of coal mine fire warning and monitoring, and in particular to a full-laser multi-channel gas fire warning monitoring system and a fire warning method. Background Art

[0002] With the reorganization of mines and continuous mining over the years, a large number of goafs have been formed under the coal production base. Various types of mine fires occur from time to time, causing a large amount of direct or indirect economic losses. In order to prevent and control internal fires in mines, a full laser multi-channel gas fire monitoring device was studied to timely monitor the index gas of coal spontaneous combustion in the goaf underground, so as to buy precious time for escape and prevention of coal spontaneous combustion.

[0003] At present, there are two main traditional detection methods for coal mine goafs, working faces and other environmental areas: the first is to use electrochemical, infrared and other detection methods, which are easily affected by water vapor and gas cross-interference during the detection process, which is not conducive to the accuracy of data detection. With the increase of monitoring points, the number of equipment will also increase. The second method uses manual sampling and ground chromatography detection. Although the detection data is accurate, the number of sampling times per day is limited. The time interval from gas sampling to gas detection is at least several hours to get the results. Some even have to wait until the second day to see the data results of the previous day. The real-time validity of the data cannot be guaranteed at all. If the number of detection points increases, the manpower and material resources will also increase greatly.

[0004] In response to the above problems, the Chinese patent application number 2022228715791 discloses a coal mine goaf fire monitoring system, including: a number of gas monitoring modules, a number of gas monitoring modules are respectively arranged underground, and each gas monitoring module is connected to a number of sampling pipelines, each sampling pipeline is respectively arranged at a monitoring point, and the length is less than the set value; an underground switch, a number of gas monitoring modules are respectively connected to the underground switch for communication, and the monitoring information is sent to the underground switch; a ground monitoring system, a ground monitoring system is connected to the underground switch for communication, and the monitoring information is received and analyzed. The system transmits the monitoring information to the ground through electrical or optical signals, and the data transmission rate is fast. Compared with the method of transporting the gas to the ground for analysis through a gas pipeline, it has high efficiency, fast response speed, and high real-time monitoring, which saves precious time for the subsequent evacuation of personnel and the extinguishing of the fire. However, during the setting, since the gas is collected directly through the sampling pipeline connected to the gas detection module, the length of the pipeline is limited. If it is too long, the gas cannot enter the gas monitoring module. Based on this, multiple gas monitoring modules need to be set up underground to meet the requirements of gas sampling and monitoring in multiple goafs. The above structure is costly, and since the sampling pipeline is exposed to the air and there is a lot of dust in the underground environment, the sampling pipeline is prone to blockage after long-term use, requiring manual inspection and maintenance. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a full laser multi-channel gas fire warning monitoring system and a fire warning method to solve the problems of the existing mine fire detection system, such as the large number of monitoring equipment, high cost, and easy clogging of sampling pipelines after long-term use, which requires manual inspection and maintenance one by one, which is time-consuming and labor-intensive and affects production.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a full laser multi-channel gas fire early warning monitoring system, including an above-ground monitoring part and an underground monitoring part, the above-ground monitoring part includes a ground monitoring server host; the underground monitoring part includes a gas monitoring module and a network switch, the network switch is connected to the ground monitoring server host and the gas monitoring module, and is used to transmit the real-time data of the gas monitoring module to the ground monitoring server; the underground monitoring part also includes an air pump, a bundle tube switching valve group and a plurality of sampling bundle tubes with their ends placed in different goafs, the air pump is placed between the bundle tube switching valve group and the gas monitoring module, and the exhaust end of the air pump is connected to the gas monitoring module; the bundle tube switching valve group includes a plurality of switching valves corresponding to the sampling bundle tubes one by one, the air inlet end of each switching valve is connected to the corresponding sampling bundle tube, and the exhaust end of each switching valve is connected to an exhaust pipe and then connected to the air inlet pipe of the air pump; A gas reversing valve is provided on the exhaust pipe, and a pressure sensor and a compressed gas source control valve connected to the gas reversing valve are provided on the gas reversing valve, and the compressed gas source control valve is connected to the compressed gas tank; the pressure sensor is communicatively connected to a controller for detecting the air pressure in the exhaust pipe in real time, and transmitting the detected air pressure value to the controller, the controller is connected to the compressed gas source control valve, for receiving the air pressure value sent by the pressure sensor, and sending an opening or closing signal to the compressed gas source control valve according to the air pressure value; when the compressed gas source control valve receives the closing signal, the compressed gas source control valve is closed, and the channel between the gas reversing valve and the compressed gas source control valve is closed; when the compressed gas source control valve receives the opening signal, the compressed gas source control valve is opened, the channel between the gas reversing valve and the compressed gas source control valve is connected, and the channel between the gas reversing valve and the vacuum pump is closed.

[0007] In this way, each sampling bundle tube corresponds to a goaf area or a closed area, and each bundle tube is connected to one of the control valves in the bundle tube control valve, so that after the vacuum pump is turned on, one of the control valves in the bundle tube control valve is opened, that is, the air in the goaf area where the bundle tube connected to the control valve is located can be sucked into the vacuum pump through the bundle tube, and then enter the gas monitoring module from the exhaust end of the vacuum pump. The gas monitoring module detects and analyzes the gas concentration in the goaf area. After the masonry monitoring module monitors and analyzes the collected gas, it will send the detection results to the ground monitoring server through the network switch. The ground monitoring server stores the detection results or issues an early warning to the terminal based on the monitoring results. In this detection system, each sampling bundle tube corresponds to a different area, and each sampling bundle tube is controlled separately, that is, there will be no air cross interference, which can improve the accuracy of the gas monitoring module. At the same time, after adopting the above monitoring system, by continuously opening or closing different control valves, air can be sucked and tested in multiple areas at intervals. Gas sampling is quick and convenient with high efficiency, and all tests are performed through a gas monitoring module. The detection equipment is more simplified, and the results are more convenient and quick to view, which can effectively save costs. During the monitoring process, one of the switching valves in the multi-channel beam tube switching valve group is opened one by one. When the vacuum pump is sucking, the sampling beam tube corresponding to the switching valve is connected, and the air in the corresponding area of ​​the end of the beam tube is sucked into the vacuum pump through the sampling beam tube, the switching valve, and the exhaust pipe. At the same time, the pressure sensor connected to the exhaust pipe can monitor the air pressure of the exhaust pipe in real time and transmit the air pressure value to the controller. The controller determines the negative pressure of the air in the beam tube according to the air pressure value. If the negative pressure value is within the preset range, it is determined that the beam tube is unobstructed, the compressed air source control valve is closed, and the channel between the compressed air source control valve and the gas reversing valve is closed; if the negative pressure value is outside the set range, it is determined that the beam tube is blocked, and the controller An opening command is sent to the compressed gas source control valve, the compressed gas source control valve is opened, and the channel between the gas reversing valve and the vacuum pump is closed. The positive pressure air in the compressed gas tank passes through the compressed gas source control valve and sequentially passes through the gas reversing valve and the switching valve corresponding to the blocked bundle pipe, and then moves toward the blocked bundle pipe. At this time, the gas movement direction is opposite to the flow direction when the vacuum pump is turned on, and the bundle pipe is recoiled, so that the blocked coal dust, coal slag and other blockages can be blown out of the bundle pipe under the push of high-pressure gas, so that the bundle pipe is unblocked. After a certain period of time, the controller sends a closing signal to the compressed gas source control valve to complete the blockage, and then opens the channel between the gas reversing valve and the vacuum pump, and starts the vacuum pump to monitor and check the next bundle pipe.In this way, there is no need to manually check the blockage of the bundle pipes one by one. It is only necessary to detect and determine the air pressure of the bundle pipes in real time during the working process, and judge whether it is blocked by the change of the air pressure value. If it is blocked, the blockage in the bundle pipe can be blown out by backblowing with compressed air source. There is no need to cut the blocked bundle pipe open and clear it. It can effectively ensure the sealing of the bundle pipe after clearing the blockage, and it can also clearly identify which bundle pipe is blocked. The checking method is simple and fast, and there is no need to add too much equipment, saving manpower and material resources.

[0008] Furthermore, a multi-channel dust filter device and a multi-channel water filter device are provided on the passage from each sampling bundle tube to the bundle tube switching valve group. After the multi-channel filter layer device and the multi-channel water filter device are provided, the air in each sampling bundle tube can be filtered for dust and water, so as to prevent the water vapor in the air from entering the gas monitoring module, and ensure that the water vapor does not enter the interior of the monitoring module, causing damage to the equipment in the device and affecting the accuracy of the laser sensor detection.

[0009] Furthermore, an airflow buffer chamber and a collection pump are provided between the vacuum pump and the gas monitoring module. The airflow buffer chamber is provided with a main exhaust port and a secondary exhaust port, and the air inlet of the collection pump is connected to the secondary exhaust port of the airflow buffer chamber. After the airflow buffer chamber is set, the air in the beam tube enters the airflow buffer chamber for buffering and a certain amount of air is discharged through the main exhaust port, which can effectively control the displacement entering the laser sensor and prevent the accumulation of gas in different beam tubes from causing cross interference and affecting the gas concentration. That is, after a part of the remaining air is discharged through the airflow buffer chamber, the air introduced by the current beam tube is sucked into the laser sensor through the collection pump for detection, which effectively improves the accuracy of the detection.

[0010] Furthermore, the collection pump is a small flow air pump, and a steam-water separator is provided between the collection pump and the gas monitoring module, and the air inlet of the steam-water separator is connected to the collection pump. After the collection pump sucks again, heat will be generated after a long time, and a certain amount of water vapor will be formed. The steam-water separator is provided in front of the laser sensor, which can effectively separate the water vapor in the air to be detected to avoid affecting the detection accuracy.

[0011] Furthermore, a collection valve is provided on the connecting pipeline between the secondary exhaust port of the airflow buffer chamber and the collection pump. The collection valve can be opened or closed according to the detection needs to control the flow rate and the entry channel of the gas.

[0012] Furthermore, the gas monitoring module includes a laser analysis module and a data display module, and a gas exhaust pipeline is also provided on the laser analysis module. The laser analysis module provided in the gas monitoring module is mainly connected to the pipeline to detect and analyze the introduced gas, while the data display module is connected to the laser analysis module to receive the detection results and display the detection results.

[0013] Furthermore, a pressure reducing valve is provided between the compressed gas tank and the compressed gas source control valve. After the pressure reducing valve is provided there, the high-pressure gas in the compressed gas tank can be reduced in pressure to meet the bearing strength of the compressed gas source control valve.

[0014] Furthermore, the gas reversing valve is a two-position three-way reversing valve, including a first normally open passage between the connected exhaust pipe and the gas reversing valve, a second passage between the gas reversing valve and the compressed gas source control valve, and a third passage between the gas reversing valve and the vacuum pump; the controller is communicatively connected to the gas reversing valve, and when the controller sends an opening signal to the compressed gas source control valve, it simultaneously sends an opening signal to the second passage of the gas reversing valve and a closing signal to the third passage of the gas reversing valve. The gas reversing valve has three channels, wherein the second passage and the third passage are opened or closed respectively during the process of clearing blockage and normal fire monitoring, which can meet the use of the fire monitoring device under different working conditions.

[0015] The fire warning method of the above-mentioned all-laser multi-channel gas fire warning monitoring system includes the following steps: S1, opening one of the switching valves in the beam tube switching valve group, and at the same time turning on the vacuum pump, and the air at the end of the sampling beam tube connected to the switching valve corresponding to the vacuum pump is sucked into the vacuum pump, and then enters the gas monitoring module, and the gas detection module performs laser detection on the sucked sampled air, and then outputs the detection result to the network switch, and finally transmits it to the ground monitoring server host to complete the fire warning of the corresponding area of ​​the sampling beam tube; the ground monitoring server host makes a judgment based on the parameter warning value of different characteristic gases, and if the monitored gas parameter value is within the allowable normal range, the gas data will be stored in the server in chronological order; if the current characteristic gas parameter value is higher than the preset warning threshold, an alarm instruction is issued to the terminal; S2, closing the switching valve opened in S1; S3, repeating steps S1 and S2 until all sampling beam tubes complete the fire warning. In this way, after exhausting gas from each sampling tube one by one, the gas is tested in the same gas monitoring module and uploaded to the ground detection server on the well. The ground monitoring server performs early warning judgment and stores data. When the gas concentration exceeds the threshold, an early warning can be issued. After the data is stored, it is convenient for the terminal to quickly find the location of the early warning and conduct targeted inspections quickly.

[0016] Furthermore, when the vacuum pump sucks air from the area corresponding to the sampling bundle tube, the pressure sensor monitors the air pressure of the exhaust pipe in real time and transmits the air pressure value to the controller. The controller determines whether the bundle tube is blocked according to the air pressure value. If the negative pressure value is within the preset range, the bundle tube is determined to be unobstructed, the compressed air source control valve is closed, and the channel between the compressed air source control valve and the gas reversing valve is closed; if the negative pressure value is outside the preset range, the sampling bundle tube is determined to be blocked, and the controller sends an opening instruction to the compressed air source control valve, the compressed air source control valve is opened, and the channel between the gas reversing valve and the vacuum pump is closed; the positive pressure air of the compressed gas tank passes through the pressure reducing valve and the compressed air source control valve, and then passes through the gas reversing valve and the switching valve corresponding to the sampling bundle tube in turn, and moves toward the blocked sampling bundle tube to blow the blockage in the sampling bundle tube out of the sampling bundle tube. During the monitoring process, it is possible to simultaneously monitor in real time whether the sampling bundle tube of the current pipeline is blocked. When blockage is found, the reverse blowing method is used to blow out only the dust in the sampling bundle tube with positive pressure gas. There is no need for manual investigation, which is highly efficient and will not affect fire monitoring and early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the system installation in which the sampling bundle tube is not blocked and the fire condition monitoring and the blocking monitoring of the sampling bundle tube are performed on the goaf corresponding to one of the sampling bundle tubes in the embodiment; Figure 2 It is a schematic diagram of the use status of the fire early warning monitoring system in the embodiment when the blocked sampling bundle tube is back-flushed after the sampling bundle tube is blocked. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0019] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] like Figure 1 , Figure 2As shown, the full laser multi-channel gas fire early warning monitoring system provided in this embodiment includes an above-ground monitoring part and a downhole monitoring part. The above-ground monitoring part includes a ground monitoring server host 12; the downhole monitoring part includes a gas monitoring module 10 (the masonry monitoring module is an existing product, which is mainly used to detect and analyze the characteristic gases within the wavelength range, detect the corresponding gas concentration, and display the data detection results on the device) and a network switch 11. The network switch 11 is connected to the ground monitoring server host 12 and the gas monitoring module 10, and is used to connect the gas monitoring module 10 to the ground monitoring server host 12. The real-time data is transmitted to the ground monitoring server; the underground monitoring part also includes an air pump 5, a bundle tube switching valve group 4 and a plurality of sampling bundle tubes 1 with their ends placed in different goafs, the air pump 5 is placed between the bundle tube switching valve group 4 and the gas monitoring module 10, and the exhaust end of the air pump 5 is connected to the gas monitoring module 10; the bundle tube switching valve group 4 includes a plurality of switching valves 41 corresponding to the sampling bundle tubes 1 one by one, the air inlet end of each switching valve 41 is connected to the corresponding sampling bundle tube 1, and the exhaust end of each switching valve 41 is connected to an exhaust pipe 42, and then connected to the air inlet pipe of the air pump 5; A gas reversing valve 13 is provided on the exhaust pipe 42, and a pressure sensor 14 and a compressed gas source control valve 16 connected to the gas reversing valve 13 are provided on the gas reversing valve 13, and the compressed gas source control valve 16 is connected to the compressed gas tank 17; the pressure sensor 14 is communicatively connected with a controller 15, and is used to detect the air pressure in the exhaust pipe 42 in real time, and transmit the detected air pressure value to the controller 15, and the controller 15 is connected with the compressed gas source control valve 16, and is used to receive the air pressure value sent by the pressure sensor 14, and send an opening or closing signal to the compressed gas source control valve 16 according to the air pressure value; when the compressed gas source control valve 16 receives the closing signal, the compressed gas source control valve 16 is closed, and the channel between the gas reversing valve 13 and the compressed gas source control valve 16 is closed; when the compressed gas source control valve 16 receives the opening signal, the compressed gas source control valve 16 is opened, the channel between the gas reversing valve 13 and the compressed gas source control valve 16 is connected, and the channel between the gas reversing valve 13 and the air pump 5 is closed.

[0021] In this way, each sampling bundle tube 1 corresponds to a goaf area or a closed area, and each bundle tube is connected to one of the control valves in the bundle tube control valve, so that after the vacuum pump 5 is turned on, one of the control valves in the bundle tube control valve is opened, that is, the air in the goaf area where the bundle tube connected to the control valve is located can be sucked into the vacuum pump 5 through the bundle tube, and then enter the gas monitoring module 10 from the exhaust end of the vacuum pump 5. The gas monitoring module 10 detects and analyzes the gas concentration in the goaf area. After the masonry monitoring module monitors and analyzes the collected gas, it will send the detection results to the ground monitoring server through the network switch 11. The ground monitoring server stores the detection results or issues an early warning to the terminal according to the monitoring results. In this detection system, each sampling bundle tube 1 corresponds to a different area, and each sampling bundle tube 1 is controlled separately, that is, there will be no air cross interference, which can improve the accuracy of the gas monitoring module 10. At the same time, after adopting the above-mentioned monitoring system, by continuously opening or closing different control valves, air can be sucked and tested at intervals in multiple areas. Gas sampling is quick and convenient with high efficiency, and all tests are carried out through a gas monitoring module 10. The detection equipment is simpler, the results are more convenient and quick to view, and costs can be effectively saved. During the monitoring process, one of the switching valves 41 of the multi-channel beam tube switching valve group 4 is opened one by one. When the air pump 5 is pumping, the sampling beam tube 1 corresponding to the switching valve 41 is connected, and the air in the corresponding area of ​​the end of the beam tube is sucked into the air pump 5 through the sampling beam tube 1, the switching valve 41, and the exhaust pipe 42. During the suction, the pressure sensor 14 connected to the exhaust pipe 42 can monitor the air pressure of the exhaust pipe 42 in real time, and transmit the air pressure value to the controller 15. The controller 15 determines the negative pressure of the air in the beam tube according to the air pressure value. If the negative pressure value is within the preset range, it is determined that the beam tube is unobstructed, the compressed air source control valve 16 is closed, and the channel between the compressed air source control valve 16 and the gas reversing valve 13 is closed; if the negative pressure value is outside the set range, it is determined that the beam tube is blocked, and the controller 15 is turned off. The controller 15 sends an opening command to the compressed gas source control valve 16, the compressed gas source control valve 16 is opened, and the passage between the gas reversing valve 13 and the vacuum pump 5 is closed. The positive pressure air of the compressed gas tank 17 passes through the compressed gas source control valve 16, passes through the gas reversing valve 13 and the switching valve 41 corresponding to the blocked bundle pipe in turn, and moves toward the blocked bundle pipe. At this time, the gas movement direction is opposite to the flow direction when the vacuum pump 5 is turned on, and the bundle pipe is recoiled, so that the blocked coal dust, coal slag and other blockages can be blown out of the bundle pipe under the push of high-pressure gas, so that the bundle pipe is unblocked. After a certain period of time, the controller 15 sends a closing signal to the compressed gas source control valve 16 to complete the blockage, and then opens the passage between the gas reversing valve 13 and the vacuum pump 5, and starts the vacuum pump 5 to monitor and check the next bundle pipe.In this way, there is no need to manually check the blockage of the bundle pipes one by one. It is only necessary to detect and determine the air pressure of the bundle pipes in real time during the working process, and judge whether it is blocked by the change of the air pressure value. If it is blocked, the blockage in the bundle pipe can be blown out by backblowing with compressed air source. There is no need to cut the blocked bundle pipe open and clear it. It can effectively ensure the sealing of the bundle pipe after clearing the blockage, and it can also clearly identify which bundle pipe is blocked. The checking method is simple and fast, and there is no need to add too much equipment, saving manpower and material resources.

[0022] Furthermore, a multi-channel dust filter device 2 and a multi-channel water filter device 3 are provided on the passage from each sampling bundle tube 1 to the bundle tube switching valve group 4, and the multi-channel dust filter device 2 and the multi-channel water filter device 3 are provided with pipeline interfaces connected to each sampling bundle tube 1. After the multi-channel filter layer device and the multi-channel water filter device 3 are provided, the air in each sampling bundle tube 1 can be filtered for dust and water, and the water vapor in the air is prevented from entering the gas monitoring module 10, ensuring that the water vapor does not enter the interior of the monitoring module, causing damage to the equipment in the device and affecting the accuracy of the laser sensor detection.

[0023] Furthermore, an airflow buffer chamber 6 and a collection pump 8 are provided between the vacuum pump 5 and the gas monitoring module 10. The airflow buffer chamber 6 is provided with a main exhaust port and a secondary exhaust port, and the air inlet of the collection pump 8 is connected to the secondary exhaust port of the airflow buffer chamber 6. After the airflow buffer chamber 6 is set, the air in the beam tube enters the airflow buffer chamber 6 for buffering and a certain amount of air is discharged through the main exhaust port, which can effectively control the displacement entering the laser sensor and prevent the accumulation of gas in different beam tubes from causing cross interference and affecting the gas concentration. That is, after a part of the remaining air is discharged through the airflow buffer chamber 6, the air introduced by the current beam tube is sucked into the laser sensor through the collection pump 8 for detection, which effectively improves the accuracy of the detection.

[0024] Furthermore, the collection pump 8 is a small flow rate suction pump 5, and a steam-water separator 9 is provided between the collection pump 8 and the gas monitoring module 10, and the air inlet end of the steam-water separator 9 is connected to the collection pump 8. After the collection pump 8 sucks again, heat will be generated after a long time, and a certain amount of water vapor will be formed. The steam-water separator 9 is provided in front of the laser sensor, which can effectively separate the water vapor in the air to be detected to avoid affecting the detection accuracy.

[0025] Furthermore, a collection valve 7 is provided on the connecting pipeline between the secondary exhaust port of the airflow buffer chamber 6 and the collection pump 8. The collection valve 7 can be opened or closed according to the detection needs to control the flow rate and the entry channel of the gas.

[0026] Furthermore, the gas monitoring module 10 includes a laser analysis module 101 and a data display module 102, and a gas exhaust pipeline is also provided on the laser analysis module 101. The laser analysis module 101 provided in the gas monitoring module 10 is mainly connected to the pipeline to detect and analyze the introduced gas, while the data display module 102 is connected to the laser analysis module 101 to receive the detection results and display the detection results.

[0027] Furthermore, a pressure reducing valve is provided between the compressed gas tank 17 and the compressed gas source control valve 16. After the pressure reducing valve is provided there, the high-pressure gas in the compressed gas tank 17 can be reduced in pressure to meet the bearing strength of the compressed gas source control valve 16.

[0028] Furthermore, the gas reversing valve 13 is a two-position three-way reversing valve, including a first normally open passage between the connected exhaust pipe 42 and the gas reversing valve 13, a second passage between the gas reversing valve 13 and the compressed gas source control valve 16, and a third passage between the gas reversing valve 13 and the vacuum pump 5; the controller 15 is in communication connection with the gas reversing valve 13, and when the controller 15 sends an opening signal to the compressed gas source control valve 16, it also sends an opening signal to the second passage of the gas reversing valve 13 and a closing signal to the third passage of the gas reversing valve 13. The gas reversing valve 13 has three channels, wherein the second passage and the third passage are opened or closed respectively during the process of clearing blockage and normal fire monitoring, which can meet the use of the fire monitoring device under different working conditions.

[0029] The fire warning method of the above-mentioned all-laser multi-channel gas fire warning monitoring system includes the following steps: S1, opening the switching valve 41 of one of the beam tube switching valve groups 4, and at the same time opening the air pump 5, and sucking the air in the goaf of the end of the sampling beam tube 1 corresponding to the multi-open switching valve 41 into the sampling beam tube 1 through the air pump 5, and then the sampled air passes through the sampling beam tube 1, the multi-channel dust filter device 2, the multi-channel water filter device 3, the switching valve 41, the exhaust pipe 42 to the air pump 5 in sequence, and then is buffered by the airflow buffer chamber 6, and after part of the sampled air is discharged, it enters the gas monitoring module 10 after being filtered through water vapor, and the gas detection module performs laser detection on the sucked sampled air, and then outputs the detection result to the network switch 11, and finally Finally, the data is transmitted to the ground monitoring server host 12 to complete the fire warning of the corresponding area of ​​the sampling bundle tube 1; the ground monitoring server host 12 makes a judgment based on the parameter warning values ​​of different characteristic gases. If the monitored gas parameter value is within the allowable normal range, the gas data will be stored in the server in chronological order; if the current characteristic gas parameter value is higher than the preset warning threshold, an alarm instruction is issued to the terminal. At the same time, the ground monitoring server will also provide a trend warning based on the real-time data trend monitored, prompting relevant personnel to take corresponding measures in advance; S2, close the switching valve 41 opened in S1; S3, repeat the steps of S1 and S2 until all sampling bundle tubes 1 complete the fire warning. In this way, after the gas is pumped out of each sampling bundle tube 1 one by one, it is tested in the same gas monitoring module 10, and uploaded to the ground detection server on the well after the test. The ground monitoring server makes a warning judgment and stores the data. After the gas concentration exceeds the threshold, a warning is issued, and after the data is stored, it is convenient for the terminal to quickly find the location of the warning and quickly conduct targeted inspections.

[0030] like Figure 2As shown, when the air pump 5 sucks the air in the corresponding area of ​​the sampling bundle tube 1, the pressure sensor 14 monitors the air pressure of the exhaust pipe 42 in real time and transmits the air pressure value to the controller 15. The controller 15 determines the bundle tube blockage according to the air pressure value. If the negative pressure value is ≥-65kpa, it is determined that the bundle tube is unobstructed, the compressed air source control valve 16 is closed, and the channel between the compressed air source control valve 16 and the gas reversing valve 13 is closed; if the negative pressure value is <-65kpa, it is determined that the sampling bundle tube 1 is blocked, and the controller 15 sends an opening instruction to the compressed air source control valve 16, the compressed air source control valve 16 is opened, and the channel between the gas reversing valve 13 and the air pump 5 is closed; after the positive pressure air of the compressed gas tank 17 passes through the pressure reducing valve, the compressed air source control valve 16, and then passes through the gas reversing valve 13 and the switching valve 41 corresponding to the sampling bundle tube 1 in turn, it moves toward the blocked sampling bundle tube 1 to blow the blockage in the sampling bundle tube 1 out of the sampling bundle tube 1. During the monitoring process, it is possible to simultaneously monitor in real time whether the sampling bundle tube 1 of the current pipeline is blocked. When blockage is found, reverse blowing is used to blow out only the dust in the sampling bundle tube 1 with positive pressure gas. No manual investigation is required, the efficiency is high, and it will not affect fire monitoring and early warning.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A full laser multi-channel gas fire early warning monitoring system, comprising an uphole monitoring part and a downhole monitoring part, wherein the uphole monitoring part comprises a ground monitoring server host; the downhole monitoring part comprises a gas monitoring module and a network switch, wherein the network switch is connected to the ground monitoring server host and the gas monitoring module, and is used to transmit real-time data of the gas monitoring module to the ground monitoring server; characterized in that: The downhole monitoring part also includes an air pump, a bundle tube switching valve group and a plurality of sampling bundle tubes with their ends placed in different goafs. The air pump is placed between the bundle tube switching valve group and the gas monitoring module, and the exhaust end of the air pump is connected to the gas monitoring module; the bundle tube switching valve group includes a plurality of switching valves corresponding to the sampling bundle tubes one by one, the air inlet end of each switching valve is connected to the corresponding sampling bundle tube, and the exhaust end of each switching valve is connected to an exhaust pipe and then connected to the air inlet pipe of the air pump; A gas reversing valve is provided on the exhaust pipe, and a pressure sensor and a compressed gas source control valve connected to the gas reversing valve are provided on the gas reversing valve, and the compressed gas source control valve is connected to the compressed gas tank; the pressure sensor is communicatively connected to a controller for detecting the air pressure in the exhaust pipe in real time, and transmitting the detected air pressure value to the controller, the controller is connected to the compressed gas source control valve, for receiving the air pressure value sent by the pressure sensor, and sending an opening or closing signal to the compressed gas source control valve according to the air pressure value; when the compressed gas source control valve receives the closing signal, the compressed gas source control valve is closed, and the channel between the gas reversing valve and the compressed gas source control valve is closed; when the compressed gas source control valve receives the opening signal, the compressed gas source control valve is opened, the channel between the gas reversing valve and the compressed gas source control valve is connected, and the channel between the gas reversing valve and the vacuum pump is closed.

2. The all-laser multi-channel gas fire early warning monitoring system according to claim 1 is characterized in that: A multi-channel dust filtering device and a multi-channel water filtering device are also provided on the passages from each sampling bundle tube to the bundle tube switching valve group.

3. The all-laser multi-channel gas fire early warning monitoring system according to claim 1 or 2, characterized in that: An airflow buffer chamber and a collection pump are also provided between the vacuum pump and the gas monitoring module. The airflow buffer chamber is provided with a main exhaust port and a secondary exhaust port. The air inlet of the collection pump is connected to the secondary exhaust port of the airflow buffer chamber.

4. The all-laser multi-channel gas fire early warning monitoring system according to claim 3 is characterized in that: The collection pump is a small flow rate air pump. A steam-water separator is provided between the collection pump and the gas monitoring module. The air inlet end of the steam-water separator is connected to the collection pump.

5. The all-laser multi-channel gas fire early warning monitoring system according to claim 4 is characterized in that: A collection valve is also arranged on the connecting pipeline between the secondary exhaust port of the airflow buffer chamber and the collection pump.

6. The full laser multi-channel gas fire early warning monitoring system according to claim 1 or 2 or 4 or 5, characterized in that: The gas monitoring module comprises a laser analysis module and a data display module. A gas exhaust pipeline is also provided on the laser analysis module.

7. The all-laser multi-channel gas fire early warning monitoring system according to claim 6 is characterized in that: A pressure reducing valve is also provided between the compressed gas tank and the compressed gas source control valve.

8. The full laser multi-channel gas fire early warning monitoring system according to claim 1 or 2 or 4 or 5 or 7, characterized in that: The gas reversing valve is a two-position three-way reversing valve, including a first normally open passage between the connected exhaust pipe and the gas reversing valve, a second passage between the gas reversing valve and the compressed air source control valve, and a third passage between the gas reversing valve and the vacuum pump; the controller is communicatively connected to the gas reversing valve, and when the controller sends an opening signal to the compressed air source control valve, it simultaneously sends an opening signal to the second passage of the gas reversing valve and a closing signal to the third passage of the gas reversing valve.

9. The fire warning method of the all-laser multi-channel gas fire warning monitoring system according to claim 7 is characterized in that: The method comprises the following steps: S1, opening one of the switching valves in the bundle tube switching valve group, and simultaneously turning on the air pump, and sucking the air at the end of the sampling bundle tube connected to the switching valve corresponding to the air pump to the air pump, and then entering the gas monitoring module, and the gas detection module performs laser detection on the sucked sampled air, and then outputs the detection result to the network switch, and finally transmits it to the ground monitoring server host, so as to complete the fire warning of the area corresponding to the sampling bundle tube; The ground monitoring server host makes a judgment based on the parameter warning values ​​of different characteristic gases. If the monitored gas parameter value is within the allowable normal range, the gas data will be stored in the server in chronological order; if the current characteristic gas parameter value is higher than the preset warning threshold, an alarm instruction will be sent to the terminal; S2, close the switching valve opened in S1; S3, repeat steps S1 and S2 until all sampling bundle tubes have completed the fire warning.

10. The fire warning method of the all-laser multi-channel gas fire warning monitoring system according to claim 9 is characterized in that: When the vacuum pump sucks the air in the corresponding area of ​​the sampling bundle tube, the pressure sensor monitors the air pressure of the exhaust pipe in real time and transmits the air pressure value to the controller. The controller determines whether the bundle tube is blocked according to the air pressure value. If the negative pressure value is within the preset range, the bundle tube is determined to be unobstructed, the compressed air source control valve is closed, and the channel between the compressed air source control valve and the gas reversing valve is closed; if the negative pressure value is outside the preset range, it is determined that the sampling bundle tube is blocked, and the controller sends an opening instruction to the compressed air source control valve, the compressed air source control valve is opened, and the channel between the gas reversing valve and the vacuum pump is closed; the positive pressure air of the compressed gas tank passes through the pressure reducing valve and the compressed air source control valve, and then passes through the gas reversing valve and the switching valve corresponding to the sampling bundle tube in turn, and moves toward the blocked sampling bundle tube to blow the blockage in the sampling bundle tube out of the sampling bundle tube.

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