Coal Fire Source Early Perception and Targeted Fire Extinguishing Equipment

Abstract

The invention discloses a device for early perception of coal fire sources and targeted fire extinguishing, which includes an early perception composite sensor and a multi-functional integrated mine fire fighting and rescue vehicle, integrating fire detection and fire prevention and control. The early perception composite sensor has both image / characteristic gas concentration detection and alarm functions. The image detection device is protected by a semi-circular transparent tempered glass cover, and an external rotary dust collector is used to clean the dust on the cover. The characteristic gas concentration detection device has the function of cleaning the accumulated dust in the detection chamber and the intake pipeline. The multi-functional integrated mine fire fighting and rescue vehicle can prepare three kinds of fire extinguishing materials, namely slurry, inorganic solidified foam and gel foam, to meet the needs of extinguishing fires of different grades. Among them, the foaming device combines the characteristics of jet foaming and mesh foaming, and is composed of a stepless distance control low-loss jet foaming device and a multi-layer superimposed parabolic foaming mesh. The fire extinguishing process of loess partition - regional treatment - drilling perfusion is adopted for targeted control of coal fires.

Description

Technical Field

[0001] The present invention relates to the field of coal fire source perception and fire extinguishing, and particularly to the equipment for early perception of coal fire sources and targeted fire extinguishing. Background Art

[0002] As the main energy source in China, coal has strongly ensured the rapid development of China's economic society. Coal mine fires are one of the five major disasters in coal mines. The fire in coal mines develops rapidly, is complex to control, has a wide range of influence, and is extremely likely to cause casualties and property losses, and even trigger coal dust and gas explosions, resulting in greater disasters. Therefore, how to perceive coal mine fire signals in advance and extinguish fires in a targeted manner in a timely manner is very important for preventing and controlling mine fires and ensuring the safe production of coal mines. At present, the detection of underground fire in coal mines mainly makes a fire situation judgment based on the changes in parameters such as temperature, smoke, CO2, and CO. Although these means play a certain role in the prevention and control of underground fires, their sensitivity is not high, and they can no longer meet the increasingly strict requirements for fire safety in underground production. Moreover, the results measured by a single detection method can only reflect the changes in certain aspects of the spontaneous combustion of coal, and the information obtained is one-sided, which is prone to false alarms or missed alarms. At home and abroad, fire prevention and extinguishing technologies such as grouting, nitrogen injection, foam injection, spraying inhibitor, gel injection, and composite colloid injection are usually used to prevent and control coal spontaneous combustion in coal mines. However, due to the complexity of underground fires in coal mines, different fire extinguishing methods are required at different fire stages. At present, a set of detection equipment that can realize the early perception of coal fire sources and fire extinguishing equipment that can target and control according to different fire levels are needed. Summary of the Invention

[0003] In view of this, the present invention provides equipment for early perception of coal fire sources and targeted fire extinguishing for fire source detection and fire extinguishing in coal mine fire scenarios, which can, to a certain extent, improve the early detection of mine fires and the targeting of fire extinguishing.

[0004] The equipment for early perception of coal fire sources and targeted fire extinguishing proposed by the present invention mainly includes an early perception composite sensor for detecting the state of coal fires and a multi-functional integrated mine fire fighting and rescue vehicle for targeting and controlling the scale of fires in a whole-stage mine fire prevention and control system.

[0005] Furthermore, the early perception composite sensor includes an image detection device, a characteristic gas concentration detection device, and an alarm device. The image detection device consists of a CCD camera and an infrared thermal imager; the characteristic gas concentration detection device consists of an aspirating electrochemical carbon monoxide sensor and an aspirating photoelectric scattering smoke sensor; the alarm device is an audible and visual alarm. The composite sensor has the functions of detecting fire situations such as observing the real-time development process of fires, identifying the range of high-temperature areas, identifying carbon monoxide concentration, and identifying smoke concentration, as well as the alarm function of the audible and visual alarm.

[0006] Furthermore, CCD cameras are used to monitor the working status and fire scale of mines in real time; infrared thermal imagers with a wavelength of 950-2000nm (the main concentration range of infrared radiation from flame combustion) are used to determine the fire situation by analyzing the characteristics of flame area changes, edge changes, and distribution patterns; aspirated electrochemical carbon monoxide sensors and aspirated photoelectric scattering smoke sensors detect changes in the concentration of carbon monoxide and smoke, the characteristic gases of fire. Image perception and characteristic gas perception work together to provide different information when a fire occurs in the early stages. Fusion analysis of this information can reduce missed reports and false alarms in the early stages of a fire and improve the accuracy and reliability of the detection system.

[0007] Furthermore, the advanced sensing composite sensor is of intrinsically safe type for use in mines to prevent explosions in coal mines; it adopts dual power supply, one for dedicated power supply and the other for backup power supply, and can achieve automatic switching between the two power supplies to prevent power outages from affecting fire monitoring and causing safety hazards; filters are set at the sampling ports of the aspirated electrochemical carbon monoxide sensor and the aspirated photoelectric scattering flue gas sensor to prevent large amounts of dust from entering and causing blockage of the sampling ports and false alarms of the sensors; the assembly position of the composite sensor is sealed with a sealing ring to prevent environmental moisture from adversely affecting the sensitivity of the components; the outer surface of the sensor is made of metal material to effectively shield electric or magnetic field interference.

[0008] Furthermore, the image detection devices CCD camera and infrared thermal imager of the advanced perception composite sensor are both spherical structures, which can observe the real-time working status of the mine and detect fire signals in all directions; the CCD camera and infrared thermal imager are protected by a semicircular transparent tempered glass cover to prevent dust and falling objects in the mine from polluting and damaging the lens; the cover is equipped with an external rotating dust collector, the dust removal pipe has high-density nylon bristles on the near glass side, and the dust discharge hole on the far glass side. When cleaning, the dust is sucked out from the opening near the glass side, and reciprocates around the glass cover to clean the cover; after cleaning, the dust removal pipe is attached to the bottom of the sensor, and the opening on the far glass side blows out the dust, achieving a self-cleaning function and ensuring a good image detection field of view during operation.

[0009] Furthermore, the image signal, smoke concentration signal, and carbon monoxide concentration signal detected by the advanced sensing composite sensor are converted into a fire hazard detection signal through an A / D converter, input into a single-chip microcomputer processor, and the detection information is transmitted to a computer through an optical fiber signal. The computer processes the composite fire detection information through a corresponding algorithm, determines the fire hazard level (high risk / medium risk / low risk), and feeds back the fire information to the sensor, which sounds an alarm with an audible and visual alarm, and at the same time notifies the fire-fighting and rescue personnel, and starts a multifunctional integrated mining fire rescue vehicle to extinguish the fire.

[0010] Furthermore, when the fire danger level is high risk (very high smoke / carbon monoxide concentration and open fire appears), the core of fire control is to extinguish the open fire at ultra-high temperature; when the fire danger level is medium risk (relatively high smoke / carbon monoxide concentration, exceeding the critical value, but no open fire appears), the core of fire control is to seal the cracks and control the smoldering; when the fire danger level is low risk (the smoke / carbon monoxide concentration increases, but does not exceed the critical value), the core of fire control is to seal the cracks during daily operations.

[0011] Furthermore, the multi-functional integrated mine fire fighting and rescue vehicle can prepare three kinds of fire extinguishing materials, namely slurry, inorganic solidified foam and gel foam, to deal with the fire states of low-risk daily crack sealing, medium-risk smoldering crack sealing and high-risk ultra-high temperature open fire extinguishing respectively. When the fire danger level is low risk and daily crack sealing is required, water and composite ash (cement / fly ash / additive) are added to the composite slurry mixing device in a ratio of 0.4 - 0.6. The volume of the water-ash mixture injected into the composite slurry mixing device at one time does not exceed 3 / 4 of the volume of the mixing device and is not less than 1 / 3 of the volume of the mixing device, and the generated slurry is injected into the fire area. When the fire danger level is medium risk and crack sealing and smoldering control are required, high-pressure water and foaming agent are added to the jet control liquid dispenser to generate water-based foam liquid. The water-based foam liquid and nitrogen are foamed through the jet-mesh multi-layer foaming device to generate water-based foam. At the same time, slurry is prepared through the composite slurry mixing device. The water-based foam and slurry are added to the spiral mixer for mixing, and the generated inorganic solidified foam is injected into the fire area. When the fire danger level is high risk and ultra-high temperature open fire extinguishing is required, high-pressure water, foaming agent, thickening agent and cross-linking agent are added to the jet control liquid dispenser to generate gel foam liquid. The gel foam liquid and nitrogen are foamed through the jet-mesh multi-layer foaming device, and the generated gel foam is injected into the fire area. This equipment can realize a single mine fire fighting and rescue vehicle to prepare different fire extinguishing materials, meet the needs of controlling fires of different levels, and achieve the purpose of quickly extinguishing fires.

[0012] Furthermore, the jet-mesh multi-layer foaming device combines the characteristics of two foaming methods, jet foaming and mesh foaming, and includes a stepless distance control low-loss jet foaming device and a multi-layer superimposed parabolic foaming mesh, realizing the advantages of small resistance loss and high foaming multiple. The structure is subdivided into a liquid inlet, a reducing pipe, an adjustable equal-distance pipe, a centrifugal umbrella-shaped nozzle, a pressure air inlet, a suction chamber, a throat pipe, an expanding pipe, a multi-layer parabolic foaming mesh, a fixed flange and an external reducing foam outlet. The jet control liquid dispenser generates foam liquid and inputs it into the liquid inlet. After passing through the reducing pipe and the adjustable equal-distance pipe, it is evenly sprayed by the centrifugal umbrella-shaped nozzle. A negative pressure is formed in the suction chamber, and nitrogen is sucked in through the pressure air inlet and fully mixed with the sprayed liquid droplets in the throat pipe, and then foamed through the three-layer and two-layer foaming meshes.

[0013] Furthermore, the converging section, throat section, diverging section, and external converging bubble outlet of the stepless distance-control low-loss jet foamer are all connected by flanges, which is convenient for disassembly and recombination. The adjustable equidistant pipes in the converging section adopt telescopic threaded connections, and the length can be freely adjusted along the horizontal direction of the pipe section. The nozzle can extend to the end of the throat at the farthest, realizing stepless control of the throat-nozzle distance. The air inlet is designed with an inclined inlet, and the inclination angle is parallel to the midpoint of the bottom edge of the air inlet and the midpoint connection line of the throat and the equidistant pipe, which plays a role in reducing resistance. The nozzle selects a centrifugal umbrella-shaped nozzle, which is threadedly connected to the equidistant pipe. There is 1 injection hole at the bottom and 8 injection holes around it, and the aperture of the injection holes can be adjusted. After high-pressure water enters the nozzle, it rotates and impacts in the nozzle to generate kinetic energy, and sprays out at a certain angle through the injection holes. The diffusion range is wide, the droplet size is small, the specific surface area is large, and the uniformity is high.

[0014] Furthermore, the multi-layer stacked parabolic foaming net is divided into two layers. From the end of the throat to the external converging bubble outlet, the first layer is a three-layer net of stainless steel net - nylon net - gauze, and the second layer is a two-layer net of stainless steel net - nylon net. The shape of the foaming net is a parabolic structure with the opening pointing to the liquid outlet, and the middle of the foaming net is thick and the periphery is thin. During the diffusion process of the droplets along the diverging pipe, the parabolic structure causes the central fluid to diverge to the surrounding to a certain extent, reducing the central velocity and increasing the boundary velocity, making the velocity distribution uniform. The structure with a thick middle and a thin periphery and a reduced parabolic arc strengthens this uniformity, effectively weakening the velocity difference between the middle and the periphery of the diverging pipe, and enabling uniform foaming. The mesh size decreases from 3 - 4 mm of the first layer of net to 2 - 3 mm of the second layer of net, the diameter of a single foam particle decreases, and the specific surface area increases.

[0015] Furthermore, the fire extinguishing adopts the fire extinguishing process of loess partition - regional treatment - drilling and perfusion. The composite sensor transmits the fire information to the ground computer. The computer determines the fire danger level, divides different levels of dangerous areas, and then transmits the fire information to the fire fighting and rescue personnel to start the multi-functional integrated mine fire fighting and rescue vehicle. The fire fighting and rescue personnel inject loess through blasting holes on both sides of different levels of dangerous areas to play a role in blocking and partitioning. After the blocking is completed, start the multi-functional integrated mine fire fighting and rescue vehicle, prepare and inject the corresponding fire extinguishing materials (mud / inorganic solidified foam / gel foam) according to the fire level of the dangerous area to achieve the purpose of fire extinguishing. This process treats the fire area separately by blocking the fire area and targeting the preparation of fire extinguishing materials, etc., realizes rapid fire extinguishing, and reduces the spread. Description of the Drawings

[0016] The following will further illustrate the specific structure and the technical effects produced by the present invention in conjunction with the drawings, so as to fully understand the purpose, features, and effects of the present invention. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 Schematic diagram of the advanced perception composite sensor of the present invention;

[0018] Figure 2 Schematic diagram of the sensor image detection device of the present invention;

[0019] Figure 3 Flow chart of the advanced perception and targeted fire extinguishing of coal fire sources of the present invention;

[0020] Figure 4 Schematic diagram of the multi-functional integrated mine fire fighting and rescue vehicle of the present invention;

[0021] Figure 5 Schematic diagram of the jet-net multi-layer foaming device of the present invention;

[0022] Figure 6 Specific fire extinguishing process of the present invention. Specific implementation manners

[0023] In order to make the above-mentioned equipment more understandable, the advanced perception and targeted fire extinguishing equipment for coal fire sources disclosed by the present invention will be described in detail below through embodiments.

[0024] Figure 1 Schematic diagram of the advanced perception composite sensor of the present invention. The composite sensor includes an image detection device, a characteristic gas concentration detection device, and an alarm device. The image detection device consists of a CCD camera and an infrared thermal imager; the characteristic gas concentration detection device consists of a suction-type electrochemical carbon monoxide sensor and a suction-type photoelectric scattering smoke sensor; the alarm device is an audible and visual alarm. The composite sensor has the functions of observing the real-time development process of a fire, identifying the scope of a high-temperature area, identifying the carbon monoxide concentration, and identifying the smoke concentration, as well as the alarm function of the audible and visual alarm.

[0025] The CCD camera is used to monitor the working state and the scale of a fire in real time in a mine; the infrared thermal imager determines the fire situation by analyzing features such as the change of the flame area, the change of the edge, and the distribution law, etc.; the suction-type electrochemical carbon monoxide sensor and the suction-type photoelectric scattering smoke sensor detect the concentration changes of the fire characteristic gases carbon monoxide and smoke. The image perception and the characteristic gas perception act together to provide different information in the early stage of a fire. By fusing and analyzing this information, false alarms and missed alarms in the early stage of a fire can be reduced, and the accuracy and reliability of the detection system can be improved.

[0026] The advanced perception composite sensor is of intrinsically safe type for mine use to prevent underground coal mine explosions. It is powered by dual power supplies, one is a dedicated power supply and the other is a backup power supply. Automatic switching can be performed between the two power supplies to prevent power outages from affecting fire monitoring and causing potential safety hazards. The assembly position of the composite sensor is sealed with a sealing ring to prevent environmental moisture from adversely affecting the sensitivity of components. The outer surface of the sensor is made of metal material to effectively shield electric field or magnetic field interference.

[0027] The characteristic gas concentration detection device is located inside the composite sensor and includes a sampling port, an air suction pipe, a stainless steel filter screen, a flowmeter, a micro vacuum pump Ⅰ / Ⅱ, a primary / secondary filter, a detection chamber, an electrolyte tank, a compression air bag, and an electric valve. The characteristic gas concentration detection device has two modes, namely, a working mode and a cleaning mode, which are alternately started. In the working mode, micro vacuum pump Ⅰ starts to suck air. Ambient air is inhaled into the sensor through the air suction pipe and filtered by the primary filter. Part of the gas flows into the detection chamber and the electrolyte tank to measure the concentration of flue gas and carbon monoxide. The excess gas is filtered again and stored in the compression air bag. In the cleaning mode, the electric valve opens, and micro vacuum pump Ⅱ starts to suck air in the reverse direction. The clean gas after secondary filtration flows out from the compression air bag to clean the detection chamber and the intake pipeline, reducing the measurement error caused by dust accumulation and enhancing the detection accuracy. A filter screen is set at the sampling port of the air suction pipeline to prevent a large amount of dust from entering and causing blockage of the sampling port and false alarms of the sensor. A flowmeter is set at the end of the pipeline to measure the flow rate of each pipeline, facilitating quick determination of the fault location in case of a fault.

[0028] Figure 2 This is a schematic diagram of the structure of the sensor image detection device of the present invention. The image detection device includes a CCD camera and an infrared thermal imager, which are located at the center of the bottom of the advanced perception composite sensor and are both spherical structures, capable of observing the real-time working state of the mine and detecting fire signals in all directions. The outside of the image detection device is wrapped by a semi-circular transparent tempered glass shield to prevent dust and falling objects in the mine from polluting and damaging the lens. A rotary dust remover is externally installed on the glass shield. The dust removal pipe is slightly wider than the shield. The side close to the glass is made of high-density nylon bristles, and the side far from the glass is a dust discharge hole. The dust removal function of the rotary dust remover is determined by the air suction / delivery micro pump. During cleaning, air is sucked, and after cleaning, air is delivered. During cleaning, the opening on the side close to the glass sucks dust and moves reciprocally around the glass shield to clean the shield. After cleaning, the dust removal pipe is attached to the bottom of the sensor, and the opening on the side far from the glass blows out dust to achieve self-cleaning function and ensure good image detection vision during operation.

[0029] Figure 3This is the flow chart of the advanced perception and targeted fire extinguishing for the coal fire source of the present invention. The advanced perception composite sensor measures the fire risk determination parameters such as smoke concentration, carbon monoxide concentration, real-time underground images, and the edge of the flame area through the smoke detection cavity, electrolyte tank, CCD camera, and infrared thermal imager. The detected fire risk signals are converted into digital signals by the A / D converter and then input into the single-chip microcomputer processor. Subsequently, the fire information is transmitted to the computer through the optical fiber signal. The computer uses corresponding algorithms to process the composite fire detection information to determine whether a fire has occurred and judge its risk level. If it is determined that the fire risk level reaches low risk or above, feedback information is sent to the composite sensor, and the audible and visual alarm goes off. At the same time, the fire fighting and rescue personnel are notified, and the multi-functional integrated mine fire fighting and rescue vehicle is started to control the fire, achieving the ability to quickly respond to fire alarms.

[0030] Figure 4 This is the structural schematic diagram of the multi-functional integrated mine fire fighting and rescue vehicle of the present invention. The multi-functional integrated mine fire fighting and rescue vehicle can prepare three kinds of fire extinguishing materials: mud, inorganic solidified foam, and gel foam, respectively, to deal with the fire states of low-risk daily crack sealing, medium-risk smoldering crack sealing, and high-risk ultra-high temperature open fire extinguishing. When the fire risk level is low risk and daily crack sealing is required, water and composite ash body (cement / fly ash / additive) are added to the composite slurry mixing device at a ratio of 0.4 - 0.6. The volume of the water-cement mixture injected into the composite slurry mixing device at one time does not exceed 3 / 4 of the volume of the mixing device and is not less than 1 / 3 of the volume of the mixing device, and the generated mud is injected into the fire area. When the fire risk level is medium risk and crack sealing and smoldering treatment are required, high-pressure water and foaming agent are added to the jet control liquid device to generate water-based foam liquid. The water-based foam liquid and nitrogen are foamed through the jet-net multi-layer foaming device to generate water-based foam. At the same time, mud is prepared through the composite slurry mixing device, and the water-based foam and mud are added to the spiral mixer for mixing, and the generated inorganic solidified foam is injected into the fire area. When the fire risk level is high risk and ultra-high temperature and open fire extinguishing are required, high-pressure water, foaming agent, thickening agent, and cross-linking agent are added to the jet control liquid device to generate gel foam liquid. The gel foam liquid and nitrogen are foamed through the jet-net multi-layer foaming device, and the generated gel foam is injected into the fire area. This equipment can realize that a single mine fire fighting and rescue vehicle prepares different fire extinguishing materials, meet the needs of controlling fires of different levels, and achieve the purpose of quickly extinguishing fires.

[0031] Figure 5This is a schematic structural diagram of the jet-screen multi-layer foaming device of the present invention. The jet-screen multi-layer foaming device combines the characteristics of two foaming methods, jet foaming and screen foaming, and includes a stepless distance-control low-loss jet foamer and a multi-layer stacked parabolic foaming screen, achieving the advantages of small resistance loss and high foaming multiple. The structure is subdivided into a liquid inlet, a tapered pipe, an adjustable equidistant pipe, a centrifugal umbrella-shaped nozzle, a compressed air inlet, a suction chamber, a throat pipe, a tapered expansion pipe, a multi-layer parabolic screen, a fixed flange, and an externally connected tapered foam outlet. The jet liquid controller generates foam liquid and inputs it into the liquid inlet. After passing through the tapered pipe and the adjustable equidistant pipe, it is evenly sprayed by the centrifugal umbrella-shaped nozzle. A negative pressure is formed in the suction chamber, and nitrogen is sucked in from the compressed air inlet and fully mixed with the sprayed liquid droplets in the throat pipe. Then, it foams successively through the three-layer and two-layer foaming screens and is output as foam liquid through the externally connected tapered foam outlet.

[0032] The tapered section, throat section, tapered expansion section, and externally connected tapered foam outlet of the stepless distance-control low-loss jet foamer are all connected by flanges, which is convenient for disassembly and recombination. In the tapered section, the adjustable equidistant pipe uses a telescopic threaded connection, and its length can be freely adjusted along the horizontal direction of the pipe section. The nozzle can extend to the end of the throat pipe at the farthest, realizing stepless control of the throat-nozzle distance. The compressed air inlet is designed with an inclined inlet, and the inclined angle is parallel to the midpoint of the opening bottom edge and the connection line between the midpoints of the throat pipe and the equidistant pipe, which plays a role in reducing resistance. The nozzle selects a centrifugal umbrella-shaped nozzle, which is threadedly connected to the equidistant pipe. There is 1 injection hole at the bottom and 8 injection holes around it, and the aperture of the injection holes can be adjusted. After high-pressure water enters the nozzle, it rotates and impacts inside the nozzle to generate kinetic energy, and is sprayed out at a certain angle through the injection holes. The diffusion range is wide, the liquid droplet diameter is small, the specific surface area is large, and the uniformity is high.

[0033] The multi-layer stacked parabolic foaming screen is divided into two layers. From the end of the throat pipe to the externally connected tapered foam outlet, the first layer is a three-layer screen of stainless steel mesh - nylon mesh - gauze, and the second layer is a two-layer screen of stainless steel mesh - nylon mesh. The shape of the foaming screen is a parabolic structure with the opening pointing to the liquid outlet. The foaming screen is thick in the middle and thin around. During the diffusion process of the liquid droplets along the tapered expansion pipe, the parabolic structure causes the central fluid to flow to the surrounding to a certain extent, reducing the central velocity and increasing the boundary velocity, making the velocity distribution uniform. The structure with a thick middle and thin around and a reduced parabolic arc strengthens this uniformity, effectively reducing the velocity difference between the middle and the surrounding of the tapered expansion pipe, and enabling uniform foaming. The mesh size decreases from 3 - 4 mm of the first layer of screen to 2 - 3 mm of the second layer of screen, the diameter of a single foam particle decreases, and the specific surface area increases.

[0034] Figure 6This is the specific fire extinguishing process of the present invention. The fire extinguishing process adopts the method of loess partition - regional treatment - drilling and perfusion. The advanced perception composite sensor transmits the fire information to the ground computer. The computer determines the fire risk level, divides different levels of dangerous areas, and then transmits the fire information to the fire fighting and rescue personnel to start the multi-functional integrated mine fire fighting and rescue vehicle. The fire fighting and rescue personnel inject loess through blasting holes on both sides of the dangerous area according to the divided different levels of dangerous areas to play a role in sealing and partitioning. After the loess sealing is completed, the multi-functional integrated mine fire fighting and rescue vehicle is started, and the corresponding fire extinguishing materials are prepared and injected according to the fire level of the dangerous area to achieve the purpose of extinguishing the fire. This process can separately treat the fire area by means of isolating the fire area and targetedly preparing fire extinguishing materials, etc., so as to achieve the purpose of quickly extinguishing the fire and reducing the spread.

[0035] Advantages of the present invention: The present invention integrates fire detection and fire prevention and control. The advanced perception composite sensor has the functions of fire detection such as image recognition, smoke concentration recognition, carbon monoxide concentration recognition and the alarm function of the sound and light alarm, and can realize the advanced perception of mine fires; the multi-functional integrated mine fire fighting and rescue vehicle can prepare three kinds of fire extinguishing materials, namely slurry, inorganic solidified foam and gel foam, according to different fire risk levels, and adopts the fire extinguishing process of loess partition - regional treatment - drilling and perfusion to realize the targeted control of coal mine fires.

[0036] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The advanced perception and targeted fire extinguishing equipment for coal fire sources, characterized in that, Integrating fire detection and fire prevention, the advanced perception composite sensor underground detects the state of coal fire, transmits the fire information to the ground computer through optical fiber signals, determines the fire danger level, feeds back the fire situation information to the advanced perception composite sensor, the sound and light alarm gives an alarm, and at the same time starts the multi-functional integrated mine fire fighting and rescue vehicle, adopting the fire extinguishing technology of loess partition - regional treatment - borehole perfusion; The outer surface of the advanced perception composite sensor is made of metal material, powered by dual power supplies, and the assembly position is sealed with a sealing ring. It includes an image detection device, a characteristic gas concentration detection device and an alarm device, with the fire detection functions of observing the real-time development process of fire, identifying the scope of high-temperature areas, identifying carbon monoxide concentration, and identifying smoke concentration, as well as the alarm function of the sound and light alarm; The characteristic gas concentration detection device includes a sampling port, an air suction pipe, a stainless steel filter screen, a flow meter, a micro vacuum pump Ⅰ / Ⅱ, a primary / secondary filter, a detection chamber, an electrolyte tank, a compression air bag and an electric valve; The characteristic gas concentration detection device has two modes: working and cleaning, and the two modes are alternately started; in the working mode, the micro vacuum pump Ⅰ starts to suck air, and the ambient air is inhaled into the advanced perception composite sensor through the air suction pipe. After being filtered by the primary filter, part of the gas flows into the detection chamber and the electrolyte tank to measure the smoke and carbon monoxide concentration, and the excess gas is stored in the compression air bag after secondary filtration; in the cleaning mode, the electric valve opens, and the micro vacuum pump Ⅱ starts to suck air in the reverse direction, and the clean gas after secondary filtration flows out from the compression air bag to clean the detection chamber and the intake pipeline; The multi-functional integrated mine fire fighting and rescue vehicle includes a composite slurry mixing device, a jet liquid controller, a jet - mesh multi-layer foaming device and a spiral mixer, which can prepare three kinds of fire extinguishing materials: slurry, inorganic solidified foam and gel foam according to the fire danger, and respectively deal with the fire states of low-risk daily crack sealing, medium-risk smoldering crack sealing and high-risk ultra-high temperature open fire extinguishing; The jet - mesh multi-layer foaming device combines the characteristics of jet foaming and mesh foaming, and is composed of a stepless distance control low-loss jet foamer and a multi-layer superimposed parabolic foaming net; The stepless distance control low-loss jet foamer includes a tapered section, a throat section, a tapered section, an externally connected tapered bubble outlet and a centrifugal umbrella-shaped nozzle. Flange connections are used between different pipe sections. The tapered section is composed of a tapered pipe and an equidistant pipe, and the equidistant pipe is threadedly connected to the centrifugal umbrella-shaped nozzle, which can move horizontally and control the throat-nozzle distance steplessly. The injection holes of the centrifugal umbrella-shaped nozzle are distributed as 1 at the bottom and 8 around, the aperture is variable, and the air inlet is an inclined inlet, and the inclination angle is parallel to the midpoint of the bottom edge of the air inlet and the midpoint connection line of the throat section and the equidistant pipe; The multi-layer stacked parabolic foaming net is located in the gradually expanding section of the stepless distance-controlled low-loss jet foaming device, with the parabola opening pointing to the liquid outlet. The foaming net is thick in the middle and thin around. From the end of the throat section to the externally connected gradually shrinking bubble outlet, there are two foaming nets, namely a three-layer structure of stainless steel net - nylon net - gauze and a two-layer structure of stainless steel net - nylon net. The mesh size decreases from 3 - 4 mm to 2 - 3 mm. The fire extinguishing process of the loess partition - area treatment - borehole grouting is to inject loess through blasting boreholes on both sides of different levels of dangerous areas to partition the fire extinguishing area, and prepare and inject corresponding fire extinguishing materials according to the fire level of the dangerous area for individual treatment of the fire area.

2. The advanced perception and targeted fire extinguishing equipment for coal fire sources according to claim 1, characterized in that, The image detection device includes a spherical CCD camera and a spherical infrared thermal imager, which are located at the bottom center of the advanced perception composite sensor and are protected by a semi-circular transparent tempered glass cover on the outside. A rotary dust collector is installed outside the tempered glass cover. The dust removal pipe of the rotary dust collector is slightly wider than the tempered glass cover. The side close to the glass is made of high-density nylon bristles, and the side far from the glass is provided with ash discharge holes. During cleaning, the opening on the side close to the tempered glass cover sucks dust, and it moves reciprocally around the tempered glass cover to clean the cover. After cleaning, the dust removal pipe adheres to the bottom of the advanced perception composite sensor, and the opening on the side far from the glass blows out dust to achieve the self-cleaning function.

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