CN210087374U - Liquid nitrogen gas-liquid mixing and filling device for underground coal mine - Google Patents
Liquid nitrogen gas-liquid mixing and filling device for underground coal mine Download PDFInfo
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- CN210087374U CN210087374U CN201921078154.7U CN201921078154U CN210087374U CN 210087374 U CN210087374 U CN 210087374U CN 201921078154 U CN201921078154 U CN 201921078154U CN 210087374 U CN210087374 U CN 210087374U
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Abstract
The utility model discloses a liquid nitrogen gas-liquid mixing and filling device for underground coal mine, which comprises a mobile platform, a liquid nitrogen tank, a first vaporizer, a second vaporizer, a temperature control system and a liquid nitrogen flow pipeline, wherein the liquid nitrogen tank, the first vaporizer, the second vaporizer, the temperature control system and the liquid nitrogen flow pipeline are respectively fixed on the mobile platform; the liquid nitrogen flow pipeline comprises a first branch, a second branch and a third branch, wherein the first branch enables liquid nitrogen to directly flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline, the second branch enables the liquid nitrogen to flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and passing through the first vaporizer, and the third branch enables the liquid nitrogen to flow to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and sequentially passing through the first vaporizer and the second vaporizer; the temperature control system can control the liquid nitrogen inlet amount of the three branches according to the liquid nitrogen temperature at the outlet of the liquid nitrogen flow pipeline. The utility model provides a colliery is liquid nitrogen gas-liquid mixture perfusion device for in pit can realize the low temperature degeneration prevention and extinguishing fire on the basis that does not harm electromechanical device.
Description
Technical Field
The utility model relates to a coal mining technical field, concretely relates to colliery is liquid nitrogen gas-liquid mixture perfusion device for in pit.
Background
Liquid nitrogen is increasingly applied to coal mine fire prevention and extinguishing because of the dual characteristics of cooling and inerting. In the application of coal mine underground fire prevention and extinguishing, particularly when local high-temperature points and hidden fire source points among and at the top of coal mining machine supports are processed, as the temperature of liquid nitrogen is-196 ℃, when liquid nitrogen is directly drilled and poured among the coal mining machine supports and at the top of the supports, underground electromechanical equipment is easily damaged, and large economic loss is caused. Therefore, when the liquid nitrogen is used for treating coal cutter support frames or top high-temperature points and hidden fire source points, the outlet temperature of the liquid nitrogen needs to be controlled to be within the low-temperature bearing capacity of underground equipment.
Therefore, in order to solve the above problems, a liquid nitrogen gas-liquid mixing and filling device for a coal mine underground is needed, wherein three branches are arranged, the temperature of liquid nitrogen or nitrogen at the outlets of the three branches is different, and then the liquid nitrogen inlet amount of the three branches is controlled by a temperature control system, so that the liquid nitrogen or nitrogen at different temperatures at the outlet of a liquid nitrogen flow pipeline is mixed in different proportions, the temperature at the outlet of the liquid nitrogen flow pipeline is within a preset range, and finally, the low-temperature degeneration fire prevention and extinguishing can be realized on the basis of not damaging electromechanical equipment.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at overcoming the defect among the prior art, provide colliery is with liquid nitrogen gas-liquid mixture perfusion device in the pit, through setting up three branches and the exit liquid nitrogen of three branches or the temperature difference of nitrogen gas, then the liquid nitrogen admission volume of three branches is controlled through temperature control system, thereby realize the different proportion mixture of liquid nitrogen or nitrogen gas at the different temperatures in liquid nitrogen flow pipeline exit, and then make the temperature in liquid nitrogen flow pipeline exit within the predetermined range, finally can realize on the basis of not haring electromechanical device that low temperature falls prevents putting out a fire.
The utility model discloses a liquid nitrogen gas-liquid mixing perfusion device for underground coal mine, which comprises a mobile platform, a liquid nitrogen tank, a first vaporizer, a second vaporizer, a temperature control system and a liquid nitrogen flow pipeline, wherein the liquid nitrogen tank, the first vaporizer, the second vaporizer, the temperature control system and the liquid nitrogen flow pipeline are respectively fixed on the mobile platform; the liquid nitrogen flow pipeline comprises a first branch, a second branch and a third branch, wherein the first branch enables liquid nitrogen to directly flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline, the second branch enables the liquid nitrogen to flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and passing through the first vaporizer, and the third branch enables the liquid nitrogen to flow to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and sequentially passing through the first vaporizer and the second vaporizer; the temperature control system can control the liquid nitrogen inlet amount of the three branches according to the liquid nitrogen temperature at the outlet of the liquid nitrogen flow pipeline.
Further, the temperature control system comprises a sensor, a controller and a flow control valve, wherein the sensor is used for detecting a liquid nitrogen temperature signal at an outlet of the liquid nitrogen flow pipeline and sending the signal to the controller, and the controller sends a command to the flow control valve according to the signal; the flow control valve comprises a first flow control valve for controlling the flow of liquid nitrogen in the first branch, a second flow control valve for controlling the flow of liquid nitrogen in the second branch and a third flow control valve for controlling the flow of liquid nitrogen in the third branch.
Further, still including fixing the liquid nitrogen container locating component on the moving platform, liquid nitrogen container locating component is including fixing the wooden frame on the moving platform, fixing the blotter in wooden frame bottom and being used for increasing the fixed rope of liquid nitrogen container stability.
Furthermore, a groove which is adaptive to the shape of the bottom of the liquid nitrogen tank is formed in the buffer pad, one end of each fixing rope is bound on the wood frame, the other end of each fixing rope is fixed on a handle of the liquid nitrogen tank, and the number of the fixing ropes is at least four.
Furthermore, the outlet of the liquid nitrogen flowing pipeline is connected with a low temperature resistant hose, and a storage box is fixed on the mobile platform behind the outlet of the liquid nitrogen flowing pipeline.
Further, storage box top opening, and the storage box top is provided with the support groove that is used for providing the support for low temperature resistant hose.
Further, still including can dismantling the filling pipe of connection end to end in proper order, the storage is in the storage box when filling the pipe and not using.
Furthermore, the length of the perfusion tube is 1.0m-1.5m, one end of the perfusion tube is provided with an external thread, and the other end of the perfusion tube is provided with an internal thread matched with the external thread.
Further, the first vaporizer and the second vaporizer are both air bath vaporizers.
Furthermore, the pipelines of the liquid nitrogen flow pipeline are all low-temperature steel pipes; the moving platform adopts a rail flat car, and the liquid nitrogen tank adopts a self-pressurization type liquid nitrogen tank.
The utility model has the advantages that: the utility model discloses a colliery is liquid nitrogen gas-liquid mixture perfusion device for in pit, through setting up three branch roads and the exit liquid nitrogen of three branch roads or the temperature difference of nitrogen gas, then the liquid nitrogen admission volume through three branch roads of temperature control system control to the realization is mixed at the different proportion of the liquid nitrogen of the different temperatures in liquid nitrogen flow pipeline exit or nitrogen gas, and then makes the temperature in liquid nitrogen flow pipeline exit within the predetermined range, finally can realize on the basis that does not harm electromechanical device that the low temperature falls to change and prevent putting out a fire.
Drawings
The invention will be further described with reference to the following figures and examples:
fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of the working state of the storage box supporting the low temperature resistant hose;
fig. 3 is a schematic structural view of the perfusion tube of the present invention.
Detailed Description
Fig. 1 is the structural schematic diagram of the utility model, fig. 2 is the utility model discloses a storage box carries out the operating condition schematic diagram that supports to low temperature resistant hose, fig. 3 is the utility model discloses a fill the structural schematic diagram of pipe. As shown in fig. 1-3, the liquid nitrogen gas-liquid mixing and injecting device for the underground coal mine in the embodiment includes a mobile platform 1, and a liquid nitrogen tank 2, a first vaporizer 3, a second vaporizer 4, a temperature control system and a liquid nitrogen flow pipeline which are respectively fixed on the mobile platform 1; the liquid nitrogen flow pipeline comprises a first branch, a second branch and a third branch, wherein the first branch enables liquid nitrogen to directly flow from the liquid nitrogen tank 2 to the liquid nitrogen flow pipeline outlet 806, the second branch enables the liquid nitrogen to flow from the liquid nitrogen tank 2 to the liquid nitrogen flow pipeline outlet 806 after flowing out of the liquid nitrogen tank 2 and passing through the first vaporizer 3, and the third branch enables the liquid nitrogen to flow from the liquid nitrogen tank 2 to the liquid nitrogen flow pipeline outlet 806 after sequentially passing through the first vaporizer 3 and the second vaporizer 4; the temperature control system can control the liquid nitrogen inlet amount of the three branches according to the liquid nitrogen temperature at the outlet 806 of the liquid nitrogen flow pipeline. And the liquid nitrogen inlet amount of the three branches is controlled, namely the flow of liquid nitrogen or nitrogen in the three branches is controlled. In order not to damage the electromechanical equipment, the preset temperature range value is-40 ℃ to 0 ℃, and the preferable preset temperature range value is-20 ℃ to 0 ℃. Because the underground coal mine is suitable for using the air bath type vaporizer, the air bath type vaporizer is heated by the air flow of the external environment, and the air flow velocity and the temperature of different positions in the underground coal mine can be different, such as: the air velocity near the wind shaft is fast, and the temperatures corresponding to different relative heights (namely the height difference between the position and the ground) are different. Therefore, when the utility model is used at different positions, the heating capacities of the vaporizers are different, when the ambient temperature is about 25 ℃ and the wind speed is 2m/s, the temperature at the outlet of the flow pipeline can be in the temperature range specified only by the work of the first vaporizer 3, namely, the liquid nitrogen only needs to enter the second branch, and at the moment, the temperature control system does not need to change the flow of the liquid nitrogen in each branch; when the ambient temperature rises and the wind speed becomes fast (for example, the ambient temperature is 30 ℃ and the wind speed is 4 m/s), the heating capacity of the first vaporizer 3 is enhanced, then the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline is higher, and when the temperature control system detects that the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline is higher than a set temperature range value, the temperature control system gradually reduces the liquid nitrogen entering amount of the second branch and increases the liquid nitrogen entering amount of the first branch, and the temperature of the liquid nitrogen in the first branch does not pass through the vaporizer and is lower, so that the liquid nitrogen flowing out of the first branch and the nitrogen flowing out of the second branch are mixed at the outlet 806 of the liquid nitrogen flow pipeline, the liquid nitrogen gas-liquid mixing can be realized, the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline is reduced, and the temperature of the mixed liquid nitrogen; when the ambient temperature is reduced and the wind speed is slowed down (for example, the ambient temperature is 20 ℃ and the wind speed is 0.5 m/s), the heating capacity of the first vaporizer 3 is weakened, the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline is lower, if the temperature control system detects that the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline is lower than a set temperature range value, the temperature control system gradually reduces the liquid nitrogen entering amount of the second branch and increases the liquid nitrogen entering amount of the third branch, and the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline can be increased by mixing the nitrogen flowing out from the second branch and the nitrogen flowing out from the third branch due to the fact that the liquid nitrogen in the third branch is subjected to secondary vaporization and the formed nitrogen temperature is high, so that the temperature of the nitrogen at the outlet 806 of the liquid nitrogen flow pipeline meets the preset temperature range. By arranging the three branches, the temperatures of liquid nitrogen or nitrogen at the outlets of the three branches are different, and then the liquid nitrogen inlet amount of the three branches is controlled by the temperature control system, so that the liquid nitrogen or nitrogen at different temperatures at the outlet 806 of the liquid nitrogen flow pipeline is mixed in different proportions, the temperature at the outlet 806 of the liquid nitrogen flow pipeline is in a preset range, and finally the low-temperature degradation fire prevention and extinguishing can be realized on the basis of not damaging electromechanical equipment.
In this embodiment, the temperature control system includes a sensor 5, a controller 6, and a flow control valve, where the sensor 5 is configured to detect a liquid nitrogen temperature signal at an outlet 806 of the liquid nitrogen flow pipeline and send the signal to the controller 6, and the controller 6 sends a command to the flow control valve according to the signal; the flow control valves comprise a first flow control valve 701 for controlling the flow of the liquid nitrogen in the first branch, a second flow control valve 702 for controlling the flow of the liquid nitrogen in the second branch and a third flow control valve 703 for controlling the flow of the liquid nitrogen in the third branch. The sensor 5, the controller 6 and the flow control valve are all mature products which can be purchased directly on the market, for example, the sensor 5 adopts the mining temperature sensor 5, the controller 6 adopts a singlechip which is matched with the mining temperature sensor 5 for use, and the flow control valve adopts an electric flow control valve. The sensor 5 detects a liquid nitrogen temperature signal at the outlet 806 of the liquid nitrogen flow pipeline and sends the signal to the controller 6, the controller 6 compares the detected temperature with a preset temperature value, the controller 6 sends a command to the flow control valve after the comparison, for example, the preset value is-20 ℃ -0 ℃, when the detected temperature is lower than-20 ℃, the first flow control valve 701 is closed, the liquid nitrogen entering amount of the second branch is reduced through the second flow control valve 702, and the liquid nitrogen entering amount of the third branch is increased through the third flow control valve 703; when the detected temperature is higher than 0 ℃, the third flow control valve 703 is closed, the liquid nitrogen inflow of the second branch is reduced through the second flow control valve 702, and the liquid nitrogen inflow of the first branch is increased through the first flow control valve 701. In order to reduce the consumption of the low-temperature steel pipe, in the utility model, the liquid outlet of the liquid nitrogen tank 2 is communicated with a pipeline I801, the pipeline I801 is communicated with a pipeline II 802 and a pipeline III 803 through a three-way pipe I901, the pipeline II 802 directly leads to a liquid nitrogen flow pipeline outlet 806, a first flow control valve 701 is positioned between the pipeline II 802 and the liquid nitrogen flow pipeline outlet 806, the pipeline III 803 is communicated with an inlet of a first vaporizer 3, the outlet of the first vaporizer 3 is respectively communicated with a pipeline IV 804 and a pipeline V805 through a three-way pipe II 902, the pipeline IV 804 is directly led to the liquid nitrogen flow pipeline outlet 806, a second flow control valve 702 is positioned between the pipeline IV 804 and the liquid nitrogen flow pipeline outlet 806 (the pipeline IV 804 can be led to the liquid nitrogen flow pipeline outlet 806 through a pipeline II 802, at the moment, the pipeline IV 804 and the pipeline II 802 are intersected with a three-way pipe III 903, the, the second flow control valve 702 is positioned between the tee II 902 and the tee III 903), the pipeline V805 is communicated with the inlet of the second vaporizer 4, and the outlet of the second vaporizer 4 is directly communicated to the outlet 806 of the liquid nitrogen flowing pipeline.
In this embodiment, the device further comprises a liquid nitrogen tank positioning assembly fixed on the mobile platform 1, wherein the liquid nitrogen tank positioning assembly comprises a wooden frame 101 fixed on the mobile platform 1, a cushion pad 102 fixed at the bottom of the wooden frame 101, and a fixing rope 103 for increasing the stability of the liquid nitrogen tank 2. In the moving process, in order to prevent the liquid nitrogen tank 2 from falling or colliding with other components, a liquid nitrogen tank positioning assembly is arranged for positioning. The wooden frame 101 is assembled by criss-cross wooden rods, the cushion pad 102 can be made of rubber, and the fixing rope 103 can be made of nylon.
In this embodiment, the buffer pad 102 is provided with a groove adapted to the shape of the bottom of the liquid nitrogen container 2, one end of the fixing rope 103 is bound to the wooden frame 101, the other end of the fixing rope is fixed to the handle of the liquid nitrogen container 2, and at least four fixing ropes 103 are provided. The recess can reduce the degree of rocking of liquid nitrogen container 2, and liquid nitrogen container 2 has two handles usually and is located liquid nitrogen container 2 both sides respectively, so fixed rope 103 sets up four, and every handle passes through two fixed ropes 103, and fixed rope 103 both ends are fixed respectively on wooden frame 101 and handle, are in the state of tightening after fixed rope 103 both ends are fixed.
In this embodiment, the outlet 806 of the liquid nitrogen flowing pipeline is connected to a low temperature resistant hose 11, and a storage box 12 is fixed on the mobile platform 1 behind the outlet 806 of the liquid nitrogen flowing pipeline. The temperature of the outlet 806 of the liquid nitrogen flowing pipeline is-40-0 ℃, the low temperature resistant hose 11 can be a metal hose or a low temperature resistant composite hose, one end of the low temperature resistant hose 11 is connected with the outlet 806 of the liquid nitrogen flowing pipeline, and the other end of the low temperature resistant hose can be connected with an in-borehole perfusion tube. Due to the fact that the drilling position and the drilling inclination angle are different, a low-temperature-resistant hose 11 needs to be connected to the outlet 806 of the liquid nitrogen flowing pipeline to adapt to drilling holes with different heights and different inclination angles.
In this embodiment, the storage box 12 is opened at the top, and a supporting groove 12a for supporting the low temperature resistant hose 11 is disposed at the top of the storage box 12. The support is provided when the low temperature resistant hose 11 is used, so that the service life of the low temperature resistant hose 11 can be obviously prolonged, and the storage box 12 can play a role in storing articles and providing support for the low temperature resistant hose 11.
In this embodiment, still include can dismantle the filling tube 13 of connection end to end in proper order, filling tube 13 when not using deposit in storage box 12. The pouring tube 13 is detached and separated and then placed in the storage box 12 for convenient assembly during transportation and use.
In this embodiment, the length of the perfusion tube 13 is 1.0m to 1.5m, one end of the perfusion tube 13 is provided with an external thread 13a, and the other end of the perfusion tube 13 is provided with an internal thread which can be matched with the external thread 13 a. The threaded connection is simple and convenient to disassemble and assemble, and the sealing performance is good. The length of the pouring pipe 13 is 1.0m-1.5m, which is suitable for the width of the storage box 12 and the rail flat car.
In this embodiment, the first vaporizer 3 and the second vaporizer 4 are both air-bath vaporizers. The air bath type vaporizer is energy-saving and environment-friendly, does not need an external power supply and a water source, and is suitable for being used underground in a coal mine.
In this embodiment, the pipelines of the liquid nitrogen flow pipeline are all low-temperature steel pipes; the mobile platform 1 adopts a rail flat car, and the liquid nitrogen tank 2 adopts a self-pressurization type liquid nitrogen tank. The liquid nitrogen temperature is-196 ℃, the low-temperature steel tube can bear the low temperature of the liquid nitrogen, and the self-pressurization type liquid nitrogen tank can be used for liquid supplement and turnover transportation of liquid nitrogen, liquid oxygen and liquid argon biological containers and is also commonly used for matching with experimental instruments, electronic instruments and other devices.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (10)
1. The utility model provides a colliery is liquid nitrogen gas-liquid mixture perfusion device for in pit which characterized in that: the system comprises a mobile platform, and a liquid nitrogen tank, a first vaporizer, a second vaporizer, a temperature control system and a liquid nitrogen flow pipeline which are respectively fixed on the mobile platform; the liquid nitrogen flow pipeline comprises a first branch, a second branch and a third branch, wherein the first branch enables liquid nitrogen to directly flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline, the second branch enables the liquid nitrogen to flow from the liquid nitrogen tank to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and passing through the first vaporizer, and the third branch enables the liquid nitrogen to flow to the outlet of the liquid nitrogen flow pipeline after flowing out of the liquid nitrogen tank and sequentially passing through the first vaporizer and the second vaporizer; the temperature control system can control the liquid nitrogen inlet amount of the three branches according to the liquid nitrogen temperature at the outlet of the liquid nitrogen flow pipeline.
2. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 1, which is characterized in that: the temperature control system comprises a sensor, a controller and a flow control valve, wherein the sensor is used for detecting a liquid nitrogen temperature signal at an outlet of a liquid nitrogen flow pipeline and sending the signal to the controller, and the controller sends a command to the flow control valve according to the signal; the flow control valve comprises a first flow control valve for controlling the flow of liquid nitrogen in the first branch, a second flow control valve for controlling the flow of liquid nitrogen in the second branch and a third flow control valve for controlling the flow of liquid nitrogen in the third branch.
3. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 1, which is characterized in that: the liquid nitrogen tank positioning assembly comprises a wooden frame fixed on the mobile platform, a cushion pad fixed at the bottom of the wooden frame and a fixing rope used for increasing the stability of the liquid nitrogen tank.
4. The liquid nitrogen gas-liquid mixing perfusion device for the underground coal mine according to claim 3, wherein: the buffer pad is provided with a groove which is adaptive to the shape of the bottom of the liquid nitrogen tank, one end of the fixing rope is bound on the wooden frame, the other end of the fixing rope is fixed on a handle of the liquid nitrogen tank, and the number of the fixing ropes is at least four.
5. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 1, which is characterized in that: the outlet of the liquid nitrogen flow pipeline is connected with a low temperature resistant hose, and a storage box is fixed on the moving platform behind the outlet of the liquid nitrogen flow pipeline.
6. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 5, which is characterized in that: the storage box is provided with an opening at the upper part, and the top part of the storage box is provided with a supporting groove for supporting the low-temperature-resistant hose.
7. The liquid nitrogen gas-liquid mixing and injecting device for the coal mine underground according to claim 6, is characterized in that: still including can the head and the tail in proper order the detachably connected fill the pipe, fill and deposit when not using in the storage box of pipe.
8. The liquid nitrogen gas-liquid mixing and injecting device for the coal mine underground according to claim 7 is characterized in that: the length of the perfusion tube is 1.0m-1.5m, one end of the perfusion tube is provided with an external thread, and the other end of the perfusion tube is provided with an internal thread which can be matched with the external thread.
9. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 1, which is characterized in that: the first vaporizer and the second vaporizer are both air bath vaporizers.
10. The liquid nitrogen gas-liquid mixing and filling device for the underground coal mine according to claim 1, which is characterized in that: the pipelines of the liquid nitrogen flow pipelines are all low-temperature steel pipes; the moving platform adopts a rail flat car, and the liquid nitrogen tank adopts a self-pressurization type liquid nitrogen tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921078154.7U CN210087374U (en) | 2019-07-10 | 2019-07-10 | Liquid nitrogen gas-liquid mixing and filling device for underground coal mine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921078154.7U CN210087374U (en) | 2019-07-10 | 2019-07-10 | Liquid nitrogen gas-liquid mixing and filling device for underground coal mine |
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| CN210087374U true CN210087374U (en) | 2020-02-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550278A (en) * | 2020-04-15 | 2020-08-18 | 煤科集团沈阳研究院有限公司 | Ground fixed type emergency nitrogen injection system |
| CN113107485A (en) * | 2021-05-08 | 2021-07-13 | 中煤科工集团重庆研究院有限公司 | Fracturing trigger and gas extraction method based on liquid nitrogen phase change segmented fractured coal seam |
-
2019
- 2019-07-10 CN CN201921078154.7U patent/CN210087374U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550278A (en) * | 2020-04-15 | 2020-08-18 | 煤科集团沈阳研究院有限公司 | Ground fixed type emergency nitrogen injection system |
| CN113107485A (en) * | 2021-05-08 | 2021-07-13 | 中煤科工集团重庆研究院有限公司 | Fracturing trigger and gas extraction method based on liquid nitrogen phase change segmented fractured coal seam |
| CN113107485B (en) * | 2021-05-08 | 2022-04-08 | 中煤科工集团重庆研究院有限公司 | Fracturing trigger and gas extraction method based on liquid nitrogen phase change segmented fractured coal seam |
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