A kind of equipment and control method for preventing spontaneous combustion of gangue mountain and recovering heat for power generation

Abstract

The present invention discloses a device and control method for preventing spontaneous combustion of gangue mountain and heat recovery power generation, including a circulating liquid heat transfer medium supply system, a double-sleeve sealed pipe drilling and sealing heat exchange system, a temperature monitoring and intelligent control system and a heat recovery power generation system; the circulating liquid heat transfer medium supply system includes a storage tank and a liquid supply pipeline and a recovery pipeline; the storage tank is connected to the double-sleeve sealed pipe; the storage tank is connected to the heat recovery power generation system; the double-sleeve sealed pipe is connected to the supply pipeline, and the outer wall of the double-sleeve sealed pipe is connected to the heat recovery power generation system through a high-temperature output pipeline. The present application proposes a device for preventing spontaneous combustion of gangue mountain and heat recovery power generation, which is simple to construct, safe and reliable, economical and efficient, and energy-saving and environmentally friendly. It has the advantages of effective and controllable cooling, low power supply energy cost, energy saving and environmental protection, recyclable use, small engineering volume, low maintenance cost, etc., and has strong economy and practicality.

Description

Technical Field

[0001] The invention relates to the technical field of spontaneous combustion prevention and fire extinguishing of coal gangue heaps in coal mines, and in particular to a spontaneous combustion prevention and control and heat recovery power generation equipment and a control method for coal gangue heaps. Background Art

[0002] Gangue is a kind of low-carbon solid waste selected in the coal mining process, and its output accounts for about 10%-20% of the total coal production. As the depth of coal mining continues to increase, the emission of gangue increases year by year. At present, more than 2,600 gangue mountains have been formed in my country. The open-air accumulation of a large amount of gangue not only occupies land, but also produces spontaneous combustion under the long-term oxidation of air, releasing a large amount of toxic and harmful gases including CO, H2S, SO2, etc., which endangers people's health and pollutes the environment.

[0003] Once gangue heaps are in contact with oxygen for a long time and spontaneously combust, it is very difficult to extinguish the fire, and the heat released by the spontaneous combustion cannot be effectively and greenly utilized. Traditional fire prevention and extinguishing methods include grouting fire extinguishing, covering and rolling, excavation extinguishing, gangue separation, deep injection of inert gas, pressure injection of chemical retardant materials, water sprinkling and cooling, etc. However, due to high cost, large engineering workload, poor prevention and control effect, and environmental pollution, they are not widely promoted and applied. The prevention and control of spontaneous combustion of gangue heaps needs to be further effectively solved.

[0004] Relevant research shows that after the spontaneous combustion of coal gangue pile, the surface temperature of the coal gangue can reach 40-50℃, and the internal temperature of the gangue pile can reach 300-1000℃. It is precisely because of the large accumulation of heat that a large amount of toxic and harmful gases are released. Therefore, on the basis of effective prevention and control of spontaneous combustion of coal gangue pile, it is necessary to further solve the problem of heat recovery. Summary of the invention

[0005] The purpose of the present invention is to provide a coal gangue mountain spontaneous combustion prevention and control and heat recovery power generation equipment and control method to solve the problems existing in the above-mentioned prior art, can achieve effective controllable cooling, reduce the power supply energy cost, the whole system is energy-saving and environmentally friendly, and can be recycled.

[0006] To achieve the above-mentioned object, the present invention provides the following scheme: The present invention provides a device for preventing spontaneous combustion of coal gangue heap and recovering heat for power generation, characterized in that it includes a circulating liquid heat transfer medium supply system, a double-set sealed pipe drilling and sealing heat exchange system and a heat recovery power generation system;

[0007] The circulating liquid heat transfer medium supply system includes a storage tank, a liquid supply pipeline and a recovery pipeline; the storage tank is connected to the double-sleeved sealed pipe drilling and sealing heat exchange system through the supply pipeline; the storage tank is connected to the heat recovery power generation system through the recovery pipeline;

[0008] The double-sleeve sealed tube drill-sealed heat exchange system includes a double-sleeve sealed tube and a high-temperature output pipeline; the double-sleeve sealed tube is embedded in the coal gangue mountain; at least one double-sleeve sealed tube is provided, the top end of the double-sleeve sealed tube is connected to the supply pipeline, and the outer wall of the double-sleeve sealed tube is connected to the heat recovery power generation system through the high-temperature output pipeline.

[0009] Preferably, multiple double-set sealed tube drill-sealed heat exchange systems are arranged in a cross grid and cross-connected with the measurement nodes of the coal gangue mountain. Each double-set sealed tube drill-sealed heat exchange system is provided with multiple double-set sealed tubes, and each sealed tube is connected to the high-temperature output pipeline and the supply pipeline to achieve the purpose of transferring the liquid heat transfer medium.

[0010] Preferably, the supply pipeline and the recovery pipeline are both made of corrosion-resistant (or anti-corrosion treated) and high-temperature resistant materials including stainless steel.

[0011] The double-sleeved sealing tube includes an inner casing, an outer casing and a drill bit; the inner casing is arranged in the outer casing and is sealed and connected to the outer casing; the drill bit is fixedly arranged at the bottom of the outer casing; the pipe opening of the inner casing is connected to the pipe wall of the supply pipeline.

[0012] Preferably, the position of the outer casing in the gangue heap can be divided into an insulating section and a heat absorbing section; the division needs to be based on the actual temperature inside the gangue heap, and the heat absorbing section is the high temperature area of ​​the gangue heap;

[0013] The heat-insulating layer is arranged on the heat-insulating section of the outer wall of the outer casing. Since the high temperature inside the gangue mountain needs to be absorbed by the liquid heat transfer medium and then output through the high-temperature output pipeline, in order to prevent a large amount of heat loss during the heat exchange, a heat-insulating layer is arranged on the heat-insulating section of the outer wall of the outer casing; and similarly, the outer walls of the inner casing and the high-temperature output pipeline are all provided with heat-insulating layers; since the inner casing extends into the inner cavity of the outer casing; in order to prevent the low-temperature liquid heat transfer medium that has just entered from the storage tank from being directly heated in the inner casing, heat-insulating layers are arranged on the outer wall of the inner casing and the heat-insulating section of the outer casing;

[0014] The material of the heat insulating layer can be a single or a combination of various heat insulating materials including aluminized film, aluminized polyester film, aluminized polyimide film, etc.

[0015] Preferably, the length of the inner casing is 0.618 times the length of the outer casing, and the outer casing is drilled into the coal gangue mountain for a length of 10-15m.

[0016] Preferably, the spiral thread provided on the outer wall of the outer casing serves to enhance the sealing effect of the double-sealed casing in the coal gangue mountain.

[0017] The drill bit at the bottom has the effect of reducing the resistance when the double-sleeved sealing pipe is inserted into the coal gangue mountain, and the drilling hole of the drill bit needs to be sealed to prevent long-term contact with the outside air;

[0018] The heat recovery power generation system includes a recovery tank, a thermoelectric generator, a heat sink, a transformer and external electricity; the thermoelectric generator is sealed on the outside of the recovery tank; at least one heat sink is arranged on the outside of the thermoelectric generator; the thermoelectric generator is electrically connected to the transformer; the transformer is electrically connected to the external electricity; the recovery pipeline extends into the recovery tank.

[0019] Preferably, the recovery pool is constructed of a material with good thermal conductivity and corrosion resistance; the temperature difference generator can use power generation materials with high efficiency thermoelectric conversion, including medium temperature Pb-Te based thermoelectric materials or Pb-Te based thermoelectric materials doped with thallium.

[0020] The storage tank, the outer casing and the recovery tank are all provided with liquid heat transfer medium; the liquid heat transfer medium is surface water, groundwater, tap water, recycled water after urban and industrial sewage treatment, seawater and other water sources that meet the industrial water standards or heat transfer mediums with good thermal conductivity including liquid ammonia, liquid nitrogen, liquid pentane, heat transfer oil, etc.

[0021] A temperature monitoring and intelligent control system is also provided; the temperature monitoring and intelligent control system includes a computer temperature monitoring platform, a programmable controller PLC, an agitator and a recovery pool temperature sensor arranged in the recovery pool, a recovery pipeline circulation pump and a recovery pipeline flow control valve arranged on the recovery pipeline, a supply pipeline circulation pump and a supply pipeline flow control valve arranged on the supply pipeline, a storage pool temperature sensor arranged in the storage pool, a double-sleeved sealed tube temperature sensor arranged in the outer casing, and a coal gangue mountain temperature sensor arranged inside the coal gangue mountain;

[0022] The computer temperature monitoring platform is electrically connected to the transformer; the computer temperature monitoring platform is electrically connected to the programmable controller PLC; the recovery pool temperature sensor, the storage pool temperature sensor, the double-set sealed tube temperature sensor and the gangue mountain temperature sensor are all electrically connected to the computer temperature monitoring platform; the agitator, the recovery pipeline circulation pump, the recovery pipeline flow control valve, the supply pipeline circulation pump and the supply pipeline flow control valve are electrically connected to the programmable controller PLC.

[0023] Preferably, the agitator is arranged at the bottom of the recovery pool, and its function is to control the temperature inside the recovery pool through the rotation of the agitator. Since the heat transfer medium entering through the high-temperature output pipeline is high-temperature gas, the temperature difference inside is utilized by the thermoelectric generator to generate electrical energy.

[0024] A spiral thread and an insulation layer are also provided; the inner sleeve and the outer tube wall of the high-temperature output pipeline are both covered with the insulation layer; the upper side of the outer tube wall of the outer sleeve is also covered with the insulation layer; a spiral thread is provided on the outer side of the outer sleeve.

[0025] The external electricity includes a battery and a national grid; the battery and the national grid are electrically connected to the transformer respectively.

[0026] Preferably, the heat of coal gangue mountain can only be utilized by instant power generation, but the device of the present application can not only enter the national grid through instant power generation, but also directly store it in power storage devices such as batteries or electric vehicles.

[0027] Since the internal temperature of the gangue mountain enters the heating and temperature-raising period at 90 degrees, and the actual combustion period is above 300 degrees, the temperature of each position is accurately known by the temperature sensors arranged in each system and the temperature sensors inside the gangue mountain, and the flow rate of the heat transfer medium in the entire circulation system is controlled by the agitator, the recovery pipeline circulation pump, the recovery pipeline flow control valve, the supply pipeline circulation pump and the supply pipeline flow control valve to control the internal temperature of the high-temperature area of ​​the gangue mountain below 90 degrees or lower; in this way, the high-temperature area of ​​the gangue mountain can be prevented from spontaneous combustion due to excessive temperature, the emission of toxic and harmful substances can be reduced, and the heat generated by the spontaneous combustion of the gangue can be effectively recovered and utilized.

[0028] A method for preventing spontaneous combustion of gangue heap and heat recovery power generation control, characterized in that the specific steps are as follows:

[0029] Step 1: Set up measurement nodes on the surface of the gangue pile. The measurement nodes are arranged in a cross grid. Use an infrared thermometer to measure the surface temperature of the gangue pile and compare it with the ambient temperature to determine the abnormal area.

[0030] Step 2: Arrange a group of boreholes in the abnormal area. The group of boreholes is arranged in a grid shape. Double sets of sealing pipes are inserted into the group of boreholes through the drill bit at the bottom. Add liquid heat transfer medium into the storage pool.

[0031] Step 3: The liquid heat transfer medium in the storage tank enters the inner casing through the supply pipe, undergoes heat exchange in the outer casing, becomes high-temperature gas, and enters the recovery tank through the high-temperature output pipeline connected to the top of the outer casing side wall;

[0032] Step 4: After the high-temperature gas and liquid are cooled, they become low-temperature liquid heat transfer medium and flow back to the storage tank through the recovery pipeline to complete the cycle;

[0033] Step 5: When the recovery pool cools the high-temperature gas and liquid, the temperature difference is used to generate electricity through a temperature difference generator, which then enters the transformer for transformation to supply power to the computer temperature monitoring platform, the programmable controller PLC and external electrical appliances;

[0034] Step 6: The computer temperature monitoring platform monitors each position and then feeds back to the programmable controller PLC to control the flow rate of the liquid heat transfer medium circulation.

[0035] Preferably, the suitable spacing between the measurement nodes in step 1 is 5-10m.

[0036] Preferably, the appropriate distance between the holes in step 2 is 1 m, and the specific length should be determined according to the surface temperature measurement situation.

[0037] The control method of step six is ​​specifically as follows: when the computer temperature monitoring platform reads the temperature data of the double-sleeved sealed tube temperature sensor and the gangue mountain temperature sensor, the supply pipeline flow control valve and the supply pipeline circulation pump are controlled by the programmable controller PLC to adjust the flow rate of the liquid heat transfer medium, accelerate or slow down the heat exchange state of the outer casing heat absorption section until the temperature of the surrounding gangue drops below 90 degrees or lower; the computer temperature monitoring platform in the temperature monitoring and intelligent control system can read the temperature data of the liquid heat transfer medium recovery pool temperature sensor, and the programmable controller PLC can be used to control the recovery pipeline flow control valve, the recovery pipeline circulation pump and the agitator to control the temperature and flow rate of the liquid heat transfer medium to be sent back to the storage pool through the recovery pipeline; the operating speed of the agitator can be accelerated or slowed down according to the temperature data of the recovery pool temperature sensor to ensure the flow rate of the recovery circulation.

[0038] The present invention discloses the following technical effects: the equipment utilizes the advantages of good integrated sealing effect of drilling and sealing and effective and controllable heat conduction performance of the double-sleeve sealed tube drilling and sealing heat exchange system to continuously recycle the heat generated by oxidation inside the coal gangue mountain to the power generation system; under the dense arrangement of the double-sleeve sealed tube heat exchange system, the temperature of the abnormally high-temperature area of ​​the coal gangue mountain can be continuously reduced, the occurrence of spontaneous combustion can be prevented, the emission of toxic and harmful substances can be reduced, and the heat generated by the spontaneous combustion of coal gangue can be effectively recycled and utilized; the application proposes a coal gangue mountain spontaneous combustion prevention and control and heat recovery power generation equipment with simple construction, safety and reliability, economic efficiency, energy saving and environmental protection, which has the advantages of effective and controllable cooling, low power supply energy cost, energy saving and environmental protection, recyclable use, small engineering volume, low maintenance cost, etc., and has strong economy and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 This is a schematic diagram of the spontaneous combustion and heat recovery power generation equipment of coal gangue mountain.

[0041] Figure 2 Schematic diagram of the structure of the power generation equipment for effective temperature control to prevent spontaneous combustion of coal gangue piles and heat recovery.

[0042] Figure 3 This is a schematic diagram of the distribution of abnormal temperature areas in the coal gangue mountain according to the present invention.

[0043] Figure 4 It is a schematic diagram of the dense grid drilling and sealing construction arrangement of the present invention.

[0044] Figure 5 It is a schematic diagram of a single double-sleeve sealing tube drilling and sealing heat exchange system of the present invention.

[0045] Among them, 1-circulating liquid heat transfer medium supply system, 11-storage tank, 12-supply pipeline, 13-recovery pipeline, 2-double-sleeved sealed pipe drilling and sealing heat exchange system, 21-inner casing, 22-outer casing, 23-high-temperature output pipeline, 24-drill bit, 25-spiral thread, 26-insulation layer, 27-liquid heat transfer medium, 3-temperature monitoring and intelligent control system, 31-computer temperature monitoring platform, 32-programmable controller PLC, 33-agitator, 34-supply pipeline circulation pump, 35-supply pipeline flow control valve, 36-recovery pipeline circulation pump, 37-recovery pipeline flow control valve, 38-recovery pool temperature sensor, 39-storage pool temperature sensor, 310-double-set sealed pipe temperature sensor, 311-gangue mountain temperature sensor, 4-heat recovery power generation system, 41-recovery pool, 42-thermoelectric generator, 43-heat sink, 44-transformer, 45-battery, 46-state grid, 5-gangue mountain, 6-abnormal area and 7-drilling group. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] The present invention provides a device for preventing spontaneous combustion of coal gangue heaps and recovering heat for power generation, which is characterized by comprising a circulating liquid heat transfer medium supply system 1, a double-set sealed pipe drilling and sealing heat exchange system 2 and a heat recovery power generation system 4;

[0049] The circulating liquid heat transfer medium supply system 1 includes a storage tank 11, a liquid supply pipeline 12 and a recovery pipeline 13; the storage tank 11 is connected to the double-sleeved sealed pipe drill seal heat exchange system 2 through the supply pipeline 12; the storage tank 11 is connected to the heat recovery power generation system 4 through the recovery pipeline 13;

[0050] The double-sleeved sealed tube drilling and sealing heat exchange system 2 includes a double-sleeved sealed tube and a high-temperature output pipeline 23; the double-sleeved sealed tube is embedded in the coal gangue mountain 5; at least one double-sleeved sealed tube is provided, the top end of the double-sleeved sealed tube is connected to the supply pipeline 12, and the outer wall of the double-sleeved sealed tube is connected to the heat recovery power generation system 4 through the high-temperature output pipeline 23.

[0051] The double-sleeved sealed tube includes an inner casing 21, an outer casing 22 and a drill bit 24; the inner casing 21 is arranged in the outer casing 22 and is sealed and connected to the outer casing 22; the drill bit 24 is fixedly arranged at the bottom of the outer casing 22; the pipe mouth of the inner casing 21 is connected to the pipe wall of the supply pipeline 12.

[0052] The heat recovery power generation system 4 includes a recovery tank 41, a thermoelectric generator 42, a heat sink 43, a transformer 44 and external electricity; the thermoelectric generator 42 is sealed on the outside of the recovery tank 41; at least one heat sink 43 is provided on the outside of the thermoelectric generator 42; the thermoelectric generator 42 is electrically connected to the transformer 44; the transformer 44 is electrically connected to the external electricity; the recovery pipeline 13 extends into the recovery tank 41.

[0053] The storage tank 11, the outer casing 22 and the recovery tank 41 are all provided with a liquid heat transfer medium 27; the liquid heat transfer medium 27 is surface water, groundwater, tap water, recycled water after urban and industrial sewage treatment, seawater and other water sources that meet industrial water standards or heat transfer mediums with good thermal conductivity including liquid ammonia, liquid nitrogen, liquid pentane, heat transfer oil, etc.

[0054] A temperature monitoring and intelligent control system 3 is also provided; the temperature monitoring and intelligent control system 3 includes a computer temperature monitoring platform 31, a programmable controller PLC 32, an agitator 33 and a recovery pool temperature sensor 38 arranged in the recovery pool 41, a recovery pipeline circulation pump 34 and a recovery pipeline flow control valve 35 arranged on the recovery pipeline 13, a supply pipeline circulation pump 36 and a supply pipeline flow control valve 37 arranged on the supply pipeline 12, a storage pool temperature sensor 39 arranged in the storage pool 11, a double-sleeved sealed tube temperature sensor 310 arranged in the outer casing 22, and a gangue mountain temperature sensor 311 arranged inside the gangue mountain 5;

[0055] The computer temperature monitoring platform 31 is electrically connected to the transformer 44; the computer temperature monitoring platform 31 is electrically connected to the programmable controller PLC32; the recovery pool temperature sensor 38, the storage pool temperature sensor 39, the double-set sealed pipe temperature sensor 310 and the coal gangue mountain temperature sensor 311 are all electrically connected to the computer temperature monitoring platform 31; the agitator 33, the recovery pipeline circulation pump 34, the recovery pipeline flow control valve 35, the supply pipeline circulation pump 36 and the supply pipeline flow control valve 37 are electrically connected to the programmable controller PLC32.

[0056] A spiral thread 25 and an insulating layer 26 are also provided; the outer tube walls of the inner sleeve 21 and the high-temperature output pipeline 23 are both covered with an insulating layer 26; the upper side of the outer tube wall of the outer sleeve 22 is also covered with an insulating layer 26; and a spiral thread 25 is provided on the outer side of the outer sleeve 22.

[0057] External electricity includes a battery 45 and a national grid 46 ; the battery 45 and the national grid 46 are electrically connected to a transformer 44 , respectively.

[0058] The specific steps of the present invention are as follows:

[0059] Step 1: Set measurement nodes on the surface of the gangue mountain 5, and use a cross grid to cross-lay out the measurement nodes. Use an infrared thermometer to measure the surface temperature of the gangue mountain 5, and compare it with the ambient temperature to determine the abnormal area 6;

[0060] Step 2: Arrange the drilling group 7 in the abnormal area 6. The drilling group 7 is arranged in a grid shape. The double-set sealing pipe is inserted into the drilling group 7 through the drill bit 24 at the bottom. Add the liquid heat transfer medium 27 into the storage pool 11.

[0061] Step 3: The liquid heat transfer medium 27 in the storage tank 11 enters the inner casing 21 through the supply pipe 12, undergoes heat exchange in the outer casing 22, becomes high-temperature gas and liquid, and enters the recovery tank 41 through the high-temperature output pipe 23 connected to the top of the side wall of the outer casing 22;

[0062] Step 4: After the high-temperature gas and liquid are cooled, they become low-temperature liquid heat transfer medium 27 and flow back to the storage tank 11 through the recovery pipeline 13 to complete the cycle;

[0063] Step 5: When the recovery pool 41 cools the high-temperature gas and liquid, the temperature difference is used to generate electricity through the temperature difference generator 42, and then the electricity is transformed by the transformer 44 to supply power to the computer temperature monitoring platform 31, the programmable controller PLC32 and external electrical appliances;

[0064] Step 6: The computer temperature monitoring platform 31 monitors each position and then feeds back to the programmable controller PLC32 to control the flow rate of the circulating liquid heat transfer medium.

[0065] The control method of step six is ​​specifically as follows: when the computer temperature monitoring platform 31 reads the temperature data of the double-sealed tank temperature sensor 310 and the coal gangue mountain temperature sensor 311, the supply pipeline flow control valve 35 and the supply pipeline circulation pump 34 are controlled by the programmable controller PLC32 to adjust the flow rate of the liquid heat transfer medium 27, accelerate or slow down the heat exchange state of the heat absorption section of the outer casing 22 until the temperature of the surrounding coal gangue is reduced to below 90 degrees; the computer temperature monitoring platform 31 in the temperature monitoring and intelligent control system 3 can read the temperature data of the liquid heat transfer medium recovery pool temperature sensor 38, and the programmable controller PLC32 can control the recovery pipeline flow control valve 37, the recovery pipeline circulation pump 36 and the agitator 33 to control the temperature and flow rate of the liquid heat transfer medium 27 to be sent back to the storage tank 11 through the recovery pipeline; according to the temperature data of the recovery pool temperature sensor 38, the operation speed of the agitator 33 can be accelerated or slowed down to ensure the flow rate of the recovery circulation transportation.

[0066] In one embodiment of the present invention, the appropriate spacing of the measurement nodes in step 1 is 5 m; the length of the inner casing 21 is 0.618 times the length of the outer casing 22, and the outer casing is drilled into the coal gangue mountain for a length of 15 m.

[0067] The present invention discloses the following technical effects: the equipment utilizes the advantages of good integrated sealing effect of drilling and sealing and effective and controllable heat conduction performance of the double-sleeve sealed tube drilling and sealing heat exchange system to continuously recycle the heat generated by oxidation inside the coal gangue mountain to the power generation system; under the dense arrangement of the double-sleeve sealed tube heat exchange system, the temperature of the abnormally high-temperature area of ​​the coal gangue mountain can be continuously reduced, the occurrence of spontaneous combustion can be prevented, the emission of toxic and harmful substances can be reduced, and the heat generated by the spontaneous combustion of coal gangue can be effectively recycled and utilized; the application proposes a coal gangue mountain spontaneous combustion prevention and control and heat recovery power generation equipment with simple construction, safety and reliability, economic efficiency, energy saving and environmental protection, which has the advantages of effective and controllable cooling, low power supply energy cost, energy saving and environmental protection, recyclable use, small engineering volume, low maintenance cost, etc., and has strong economy and practicality.

[0068] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0069] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for preventing spontaneous combustion of coal gangue heaps and recovering heat for power generation, characterized in that: It comprises a circulating liquid heat transfer medium supply system (1), a double-sleeved sealed pipe drilling and sealing heat exchange system (2) and a heat recovery power generation system (4); The circulating liquid heat transfer medium supply system (1) comprises a storage tank (11), a liquid supply pipeline (12) and a recovery pipeline (13); the storage tank (11) is connected to the double-sleeved sealed pipe drill-sealed heat exchange system (2) through the supply pipeline (12); the storage tank (11) is connected to the heat recovery power generation system (4) through the recovery pipeline (13); The double-sleeved sealed pipe drilling and sealing heat exchange system (2) comprises a double-sleeved sealed pipe and a high-temperature output pipeline (23); the double-sleeved sealed pipe is embedded in the coal gangue mountain (5); at least one double-sleeved sealed pipe is provided, the top end of the double-sleeved sealed pipe is connected to the supply pipeline (12), and the outer wall of the double-sleeved sealed pipe is connected to the heat recovery power generation system (4) through the high-temperature output pipeline (23); The double-sleeved sealed tube comprises an inner sleeve (21), an outer sleeve (22) and a drill bit (24); the inner sleeve (21) is arranged inside the outer sleeve (22) and is sealedly connected to the outer sleeve (22); the drill bit (24) is fixedly arranged at the bottom of the outer sleeve (22); the pipe mouth of the inner sleeve (21) is connected to the pipe wall of the supply pipeline (12); the top end of the outer wall of the outer sleeve (22) is connected to the high-temperature output pipeline (23); The heat recovery power generation system (4) comprises a recovery pool (41), a thermoelectric generator (42), a heat sink (43), a transformer (44) and external power; the thermoelectric generator (42) is arranged on the outside of the recovery pool (41) in a sealed manner; at least one heat sink (43) is arranged on the outside of the thermoelectric generator (42); the thermoelectric generator (42) is electrically connected to the transformer (44); the transformer (44) is electrically connected to the external power; the recovery pipeline (13) extends into the recovery pool (41); A temperature monitoring and intelligent control system (3) is also provided; the temperature monitoring and intelligent control system (3) comprises a computer temperature monitoring platform (31), a programmable controller (PLC) (32), an agitator (33) and a recovery pool temperature sensor (38) arranged in the recovery pool (41), a recovery pipeline circulation pump (34) and a recovery pipeline flow control valve (35) arranged on the recovery pipeline (13), a supply pipeline circulation pump (36) and a supply pipeline flow control valve (37) arranged on the supply pipeline (12), a storage pool temperature sensor (39) arranged in the storage pool (11), a double-sleeved sealed tube temperature sensor (310) arranged in the outer casing (22), and a coal gangue mountain temperature sensor (311) arranged inside the coal gangue mountain (5); The computer temperature monitoring platform (31) is electrically connected to the transformer (44); the computer temperature monitoring platform (31) is electrically connected to the programmable controller PLC (32); the recovery tank temperature sensor (38), the storage tank temperature sensor (39), the double-sleeved sealed tube temperature sensor (310) and the gangue mountain temperature sensor (311) are all electrically connected to the computer temperature monitoring platform (31); the agitator (33), the recovery pipeline circulation pump (34), the recovery pipeline flow control valve (35), the supply pipeline circulation pump (36) and the supply pipeline flow control valve (37) are electrically connected to the programmable controller PLC (32).

2. The device for preventing spontaneous combustion of gangue heap and recovering heat for power generation according to claim 1, characterized in that: The storage tank (11), the outer casing (22) and the recovery tank (41) are all provided with a liquid heat transfer medium (27); the liquid heat transfer medium (27) is surface water, groundwater, tap water, recycled water after urban and industrial sewage treatment, seawater and other water sources that meet industrial water standards or liquid ammonia, liquid nitrogen, liquid pentane, heat transfer oil and other heat transfer mediums with good heat conduction effect.

3. The device for preventing spontaneous combustion of coal gangue heap and recovering heat for power generation according to claim 1, characterized in that: A spiral thread (25) and an insulating layer (26) are also provided; the outer tube walls of the inner layer casing (21) and the high-temperature output pipeline (23) are both covered with the insulating layer (26); the upper side of the outer tube wall of the outer layer casing (22) is also covered with the insulating layer (26); and the outer side of the outer layer casing (22) is provided with a spiral thread (25).

4. The device for preventing spontaneous combustion of coal gangue heap and recovering heat for power generation according to claim 1, characterized in that: The external electricity includes a storage battery (45) and a national power grid (46); the storage battery (45) and the national power grid (46) are electrically connected to the transformer (44) respectively.

5. A method for preventing spontaneous combustion of gangue heap and controlling heat recovery power generation according to any one of claims 1 to 4, characterized in that: The specific steps are as follows: Step 1: Setting measurement nodes on the surface of the gangue pile (5), wherein the measurement nodes are arranged in a cross grid, using an infrared thermometer to measure the surface temperature of the gangue pile (5), and comparing it with the ambient temperature to determine the abnormal area (6); Step 2: Arrange a group of drill holes (7) in the abnormal area (6), wherein the group of drill holes (7) is arranged in a grid pattern, and a double set of sealing tubes are inserted into the group of drill holes (7) through a drill bit (24) at the bottom; add a liquid heat transfer medium (27) into the storage pool (11); Step 3: The liquid heat transfer medium (27) in the storage tank (11) enters the inner casing (21) through the supply pipe (12), undergoes heat exchange in the outer casing (22), becomes high-temperature gas and liquid, and enters the recovery tank (41) through the high-temperature output pipe (23) connected to the top of the side wall of the outer casing (22); Step 4: After cooling, the high-temperature gas and liquid become low-temperature liquid heat transfer medium (27) and flow back to the storage tank (11) through the recovery pipeline (13) to complete the cycle; Step 5: When the high-temperature gas and liquid are cooled by the recovery pool (41), the temperature difference is used to generate electricity through the temperature difference generator (42), and then the electricity is transformed into electricity through the transformer (44) to supply power to the computer temperature monitoring platform (31), the programmable controller PLC (32) and external electrical appliances; Step 6: The computer temperature monitoring platform (31) monitors each position and then feeds back to the programmable controller PLC (32) to control the flow rate of the liquid heat transfer medium circulation.

6. The method for preventing spontaneous combustion of gangue heap and controlling heat recovery for power generation according to claim 5 is characterized in that: The appropriate spacing between the measurement nodes in step 1 is 5-10m.

7. The method for preventing spontaneous combustion of gangue heap and controlling heat recovery for power generation according to claim 5 is characterized in that: The control method of step six is ​​specifically as follows: when the computer temperature monitoring platform (31) reads the temperature data of the double-sleeved sealed tube temperature sensor (310) and the coal gangue mountain temperature sensor (311), the supply pipeline flow control valve (35) and the supply pipeline circulation pump (34) are controlled by the programmable controller PLC (32) to adjust the flow rate of the liquid heat transfer medium (27), accelerate or slow down the heat exchange state of the heat absorption section of the outer sleeve (22) until the temperature of the surrounding coal gangue is reduced to below 90 degrees; the temperature monitoring and intelligent control can be used to The computer temperature monitoring platform (31) in the system (3) reads the temperature data of the temperature sensor (38) of the liquid heat transfer medium recovery pool, and controls the recovery pipeline flow control valve (37), the recovery pipeline circulation pump (36) and the agitator (33) through the programmable controller PLC (32), so as to control the temperature and flow rate of the liquid heat transfer medium (27) to be sent back to the storage pool (11) through the recovery pipeline; and can accelerate or slow down the operating speed of the agitator (33) according to the temperature data of the recovery pool temperature sensor (38), so as to ensure the flow rate of the recovery circulation transportation.

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