Mine shaft cooling method

Abstract

The present application provides a kind of mine shaft cooling method, the present application relates to underground cooling technical field, comprising the following steps: S1, according to the depth of shaft, install the air supply pipeline of built-in first fan in shaft, install the exhaust duct of built-in second fan between roadway and ground;S2, along the direction of shaft driving, find cold source layer, and arrange heat exchange device in cold source layer, pumping pipeline is installed between heat exchange device and air supply pipeline, heat exchange device is connected in the middle of air supply pipeline by pumping pipeline;S3, install first refrigeration equipment at the front end of heat exchange device, install second refrigeration equipment and first temperature measuring device at the rear end of heat exchange device, according to the temperature of fluid in air supply pipeline detected by first temperature measuring device, and control signal is transmitted towards second refrigeration equipment for adjusting the refrigeration power of second refrigeration equipment.The present application guarantees the normal ventilation cooling of well bottom, reduces the working power of refrigeration equipment, and reduces the difficulty of underground construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of downhole temperature reduction, and particularly relates to a mine shaft temperature reduction method. BACKGROUND

[0002] In the process of mine shaft operation, the temperature of the shaft bottom needs to be controlled within a suitable temperature range. If the temperature is too high, it will not only affect the normal production of the workers, but also greatly reduce the working efficiency of part of the operation equipment. Therefore, during the process of mine operation, low-temperature gas needs to be continuously sent to the inside of the shaft to maintain the temperature of the shaft bottom within a suitable range.

[0003] In the prior art, composite ventilation equipment is arranged in part of the super-deep shaft, which can not only input low-temperature gas to the bottom of the shaft, but also quickly discharge part of the high-temperature exhaust gas to meet the needs of the shaft operation.

[0004] However, in the process of ventilation and temperature reduction of the super-deep shaft, the air supply pipeline has a large span, and the low-temperature gas exchanges heat with the high-temperature gas outside during the transportation process, which affects the effect of cold gas transportation. Wrapping the surface of the air supply pipeline with thermal insulation materials can slow down the speed of the low-temperature gas, but there are problems of great difficulty in arrangement and great power consumption of the single ground refrigeration equipment. SUMMARY

[0005] In view of the above problems, the present application provides a mine shaft temperature reduction method, which ensures the normal ventilation and temperature reduction of the shaft bottom while reducing the working power of the refrigeration equipment and the difficulty of underground construction.

[0006] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0007] A mine shaft temperature reduction method, comprising the following steps: S1, according to the depth of the shaft, installing an air supply pipeline with a first fan inside the shaft, and installing an exhaust pipeline with a second fan inside the shaft between the roadway and the ground; S2, finding a cold source layer along the shaft driving direction, and arranging a heat exchange device in the cold source layer, a pumping pipeline being installed between the heat exchange device and the air supply pipeline, and the heat exchange device being connected in the middle of the air supply pipeline through the pumping pipeline; S3, installing a first refrigeration equipment at the front end of the heat exchange device, and installing a second refrigeration equipment and a first temperature measuring device at the rear end of the heat exchange device, detecting the temperature of the fluid in the air supply pipeline according to the first temperature measuring device, and transmitting a control signal to the second refrigeration equipment for adjusting the refrigeration power of the second refrigeration equipment; when the temperature of the fluid in the air supply pipeline exceeds a first threshold value, increasing the refrigeration power of the second refrigeration equipment; and when the temperature of the fluid in the air supply pipeline is lower than the first threshold value, reducing the refrigeration power of the second refrigeration equipment.

[0008] Preferably, the heat exchange device comprises a first heat exchange pipeline arranged in an inclined manner and a second heat exchange pipeline arranged in an inclined manner, and the second ends of the first and second heat exchange pipelines meet to form a heat exchange channel.

[0009] Preferably, the heat exchange device is arranged in multiple groups in a circumferential direction, and two adjacent groups of heat exchange devices are located at different height positions.

[0010] Preferably, each of the plurality of pumping pipelines is internally provided with a solenoid valve, and a second temperature measuring device is installed inside the heat exchange device, the second temperature measuring device is used to detect the temperature of the fluid in the heat exchange device, and a control signal is sent to the solenoid valve to control the opening and closing of the solenoid valve; when the temperature of the fluid in the heat exchange device exceeds a second threshold value, the solenoid valve is controlled to be closed; when the temperature of the fluid in the heat exchange device is lower than the second threshold value, the solenoid valve is controlled to be opened.

[0011] Preferably, two intersecting installation channels are drilled in the inner wall of the cold source layer by a drilling device, impurities in the installation channels are pumped out by negative pressure, and then the first heat exchange pipeline and the second heat exchange pipeline are laid in the predetermined installation channels.

[0012] Preferably, the first heat exchange pipeline and the second heat exchange pipeline are both made of metal material, and an inflatable sealing air bag is installed at the second end of the first heat exchange pipeline and the second heat exchange pipeline, and after the first heat exchange pipeline and the second heat exchange pipeline are fixed, the sealing air bag is controlled to expand in a predetermined direction to form a sealing barrier.

[0013] Preferably, the second refrigeration device is installed near the roadway, and the second refrigeration device comprises a refrigeration pipeline and a heat dissipation pipeline, the refrigeration pipeline is connected in series in the air supply pipeline, and the heat dissipation pipeline extends towards the second fan.

[0014] Preferably, the cold source layer is selected as a low-temperature rock layer, and before the heat exchange device is installed, the low-temperature rock layer needs to be tested by mechanical testing and acoustic testing, and during the installation of the heat exchange device, the deformation and stress change of the low-temperature rock layer need to be detected to evaluate the stability and safety of the low-temperature rock layer.

[0015] The beneficial effects of the present application are:

[0016] Compared with the prior art, through the above structural design, the requirement of the ground refrigeration device and the heat preservation material outside the upper end of the air supply pipeline can be reduced, the heat preservation material can not be wrapped, and the gas temperature in this part does not need to be reduced to a lower temperature, the difference between the cold air and the environment temperature is reduced, the temperature rise amplitude is reduced, the normal ventilation and cooling of the well bottom are ensured, the working power of the refrigeration device is reduced, and the difficulty of underground construction is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a top view structural schematic diagram of the present application.

[0018] Figure 2 A-A sectional view structure schematic diagram of the present application Figure 1 A-A sectional view structure schematic diagram of the present application

[0019] Figure 3 B enlarged structure schematic diagram of the present application Figure 2 B enlarged structure schematic diagram of the present application

[0020] In the figure: 100, shaft; 200, roadway; 300, heat exchange device; 310, first heat exchange pipeline; 320, second heat exchange pipeline; 400, air supply pipeline; 410, first fan; 500, exhaust pipeline; 510, second fan; 600, first refrigeration equipment; 700, second refrigeration equipment; 710, refrigeration pipeline; 720, heat dissipation pipeline. DETAILED DESCRIPTION

[0021] The present application is further illustrated below in conjunction with the drawings and examples.

[0022] With the increase of mining depth, the internal temperature gradually increases due to the influence of geothermal and internal operation equipment.

[0023] During the process of mine shaft operation, the shaft bottom needs to be controlled within a suitable temperature range. If the temperature is too high, not only the normal production of the operation workers will be affected, but also the working efficiency of part of the operation equipment will be greatly reduced. Therefore, during the process of mine operation, low-temperature gas needs to be continuously transported towards the interior of the shaft to maintain the shaft bottom at a suitable temperature.

[0024] In the prior art, part of the super-deep shafts are provided with composite ventilation equipment, which not only can input low-temperature gas to the shaft bottom, but also can quickly exhaust part of the high-temperature waste gas to meet the needs of shaft operation.

[0025] However, during the ventilation and cooling process of the super-deep shaft, due to the large span of the air supply pipeline, heat exchange with the high-temperature gas outside occurs during the transportation of low-temperature gas, which affects the effect of cold gas transportation. Wrapping the surface of the air supply pipeline with thermal insulation material can slow down the speed of low-temperature gas, but there are problems of great difficulty in arrangement and great power consumption of the single ground refrigeration equipment.

[0026] In order to solve the above problems, with reference to the accompanying Figure 1 -attached Figure 3 A mine shaft cooling method, comprising the following steps:

[0027] S1, according to the depth of the shaft 100, install the air supply pipeline 400 with the first fan 410 inside in the shaft 100, install the air exhaust pipeline 500 with the second fan 510 inside between the roadway 200 and the ground; through the air supply pipeline 400 and the first fan 410, gas can be pumped towards the bottom of the shaft 100, through the air exhaust pipeline 500 and the second fan 510, high-temperature waste gas from the roadway 200 can be continuously exhausted upwards to the ground; a directional airflow is formed in the shaft 100, and the inside of the shaft 100 is maintained within a suitable temperature range.

[0028] S2, find the cold source layer along the driving direction of the shaft 100, and arrange the heat exchange device 300 in the cold source layer; a pumping pipeline is installed between the heat exchange device 300 and the air supply pipeline 400, and the heat exchange device 300 is connected in series in the middle of the air supply pipeline 400 through the pumping pipeline; through the above structure, the cooling layer in the mine can be fully utilized, and through the heat exchange device 300, the gas with a certain temperature in the upper section of the air supply pipeline 400 can be heat exchanged with the medium in the cold source layer to reduce the temperature of the gas medium in the air supply pipeline 400 and make up for the temperature rise caused by the upper end heat exchange.

[0029] Through the above structure design, the requirement for ground cooling equipment and heat preservation material outside the upper end of the air supply pipeline 400 can be reduced, the heat preservation material can not be wrapped, and the temperature of the gas in this part does not need to be reduced to a lower temperature, the difference between the cold gas and the environment is reduced, and the temperature rise amplitude is reduced.

[0030] S3, install the first refrigeration equipment 600 at the front end of the heat exchange device 300, install the second refrigeration equipment 700 and the first temperature measuring device at the rear end of the heat exchange device 300, detect the temperature of the fluid in the air supply pipeline 400 according to the first temperature measuring device, and transmit a control signal to the second refrigeration equipment 700 for adjusting the refrigeration power of the second refrigeration equipment 700; through the above structure design, through the cooperation of the first refrigeration equipment 600 and the second refrigeration equipment 700, the gas in the air supply pipeline 400 can be stepwise cooled, compared with the traditional first refrigeration equipment 600 simply arranged on the ground, the overall power consumption is lower, the length of heat exchange is shorter, the bottom of the shaft 100 can be better cooled, and the needs of mine underground operation are met.

[0031] The control process logic is that when the temperature of the fluid in the air supply pipeline 400 exceeds the first threshold value, the refrigeration power of the second refrigeration equipment 700 is increased, and when the temperature of the fluid in the air supply pipeline 400 is lower than the first threshold value, the refrigeration power of the second refrigeration equipment 700 is reduced; the working state of the second refrigeration equipment 700 here is controlled according to the actual temperature of the fluid in the air supply pipeline 400 to meet the needs of ventilation and cooling at the bottom of the shaft 100.

[0032] In summary, through the above structural design, it is not necessary to wrap the upper section of the air supply pipeline 400 with thermal insulation material, which reduces the difficulty of underground operation; at the same time, it reduces the intensity of heat exchange of the upper section of the air supply pipeline 400, reduces the distance of subsequent cold air delivery of the second refrigeration equipment 700, and reduces the working load of the refrigeration equipment; by arranging the heat exchange device 300, the cold source layer existing in the mine can be fully and efficiently utilized in the process of gas delivery, the temperature of the gas in the air supply pipeline 400 can be reduced, and the load of the second refrigeration equipment 700 for cooling can be further reduced.

[0033] It should be noted that the above-mentioned cold source layer is selected as a low-temperature rock layer, and before installing the heat exchange device 300, the low-temperature rock layer needs to be tested mechanically and by sound waves. During the installation of the heat exchange device 300, the deformation and stress change of the low-temperature rock layer need to be detected to evaluate the stability and safety of the low-temperature rock layer.

[0034] The heat exchange device 300 is installed in the low-temperature rock layer through drilling construction. Before and during drilling construction, the low-temperature rock layer is tested in real time to avoid accidents during underground installation. In addition, the cold source layer is selected as a rock layer, which needs to be staggered with the groundwater layer to avoid groundwater leakage caused by drilling processing, which affects the construction environment of underground operation.

[0035] Specifically, the heat exchange device 300 includes a first heat exchange pipeline 310 arranged obliquely and a second heat exchange pipeline 320 arranged obliquely. The second ends of the first heat exchange pipeline 310 and the second heat exchange pipeline 320 meet to form a heat exchange channel. Here, the first heat exchange pipeline 310 and the second heat exchange pipeline 320 can be selected to be arranged in a cross shape as shown in the figure, and meet to form a cross structure away from the vertical shaft 100. Figure 1 The first heat exchange pipeline 310 and the second heat exchange pipeline 320 are arranged in a cross shape as shown in the figure, and meet to form a cross structure away from the vertical shaft 100.

[0036] Through the above structural design, the construction difficulty of the cold source layer can be reduced. During construction, only the horizontal degree of the construction direction needs to be ensured to control the meeting of the first heat exchange pipeline 310 and the second heat exchange pipeline 320 and ensure the normal flow of gas in the first heat exchange pipeline 310 and the second heat exchange pipeline 320 for heat exchange. At the same time, the design of bending can prolong the distance of gas flow and heat exchange, fully utilize the low-temperature substances in the cold source layer, and improve the heat exchange effect.

[0037] Further, the heat exchange device 300 is arranged in multiple groups in the circumferential direction. Adjacent two groups of heat exchange devices 300 are located at different height positions. By arranging the heat exchange device 300 in multiple groups in the circumferential direction, the cold source layer can be further fully utilized. By arranging the heat exchange device 300 at different heights, the cold source at different height positions can be further fully utilized, and the internal structure of the mine is less damaged, which does not affect the overall strength.

[0038] Further, the plurality of pumping pipes are each provided with an electromagnetic valve, and a second temperature measuring device is arranged in the heat exchange device 300, the second temperature measuring device is used to detect the temperature of the fluid in the heat exchange device 300, and a control signal is sent to the electromagnetic valve to control the opening and closing of the electromagnetic valve; when the temperature of the fluid in the heat exchange device 300 exceeds the second threshold value, the electromagnetic valve is controlled to be closed; and when the temperature of the fluid in the heat exchange device 300 is lower than the second threshold value, the electromagnetic valve is controlled to be opened.

[0039] Through the above structural design, the temperature in different heat exchange devices 300 can be detected in real time. When the temperature in the corresponding heat exchange device 300 increases, the temperature difference decreases, and the heat exchange effect becomes poor. At this time, the corresponding electromagnetic valve is closed to avoid the gas entering the heat exchange, so that the cold source layer can be cooled to facilitate subsequent continuous heat exchange.

[0040] Through the above structural design, the cold source layer can maximize the heat exchange of the gas, improving the efficiency of the gas cooling effect. At the same time, the cold source layers in different directions can be alternately arranged in the heat exchange and cooling state, improving the effect of the cold source layer on the gas in the air supply pipeline 400.

[0041] After the impurities in the installation channel are extracted by negative pressure, the first heat exchange pipeline 310 and the second heat exchange pipeline 320 are laid in the predetermined installation channel. Through the drilling processing method, underground construction is facilitated, and large-scale damage caused by blasting is avoided to ensure the stability of the underground mine. The inner diameter of the installation channel is matched with the outer diameter of the heat exchange pipeline as much as possible, and preferably adheres to each other to improve the heat exchange effect between solids.

[0042] Further, the heat exchange medium can be filled in the installation channel after the heat exchange pipeline is installed, further increasing the contact area between the heat exchange pipeline and the installation channel, and improving the overall heat exchange and cooling effect.

[0043] The first heat exchange pipeline 310 and the second heat exchange pipeline 320 are both made of metal materials, and the inflatable sealing air bag is arranged at the second end of the first heat exchange pipeline 310 and the second heat exchange pipeline 320. After the first heat exchange pipeline 310 and the second heat exchange pipeline 320 are fixed, the sealing air bag is controlled to expand in a predetermined direction to form a sealing barrier.

[0044] Through the above structural design, a sealing barrier can be formed at the connection between the two heat exchange pipelines to ensure normal gas transportation, avoid the entry of external impurities into the heat exchange pipeline, and avoid affecting the subsequent structure.

[0045] The sealing air bags are elastic, and are shrunk in the heat exchange pipe before inflation. During the process of the heat exchange pipe extending, the sealing air bags can avoid damage caused by collision. After the heat exchange pipe is installed in place, the two sealing air bags are controlled to extend outward to form a sealing barrier, so as to ensure the sealing effect.

[0046] The second refrigeration device 700 is installed near the tunnel 200, and includes a refrigeration pipe 710 and a heat dissipation pipe 720. The refrigeration pipe 710 is connected in series in the air supply pipe 400, and the heat dissipation pipe 720 extends towards the second fan 510. The hot air generated by the second refrigeration device 700 is timely discharged by the second fan 510 and discharged to the ground.

[0047] Through the above structure design, the installation difficulty of the second refrigeration device 700 is reduced, the hot air generated by the second refrigeration device 700 can be quickly discharged, the hot air is prevented from contacting the low-temperature gas in the air supply pipe 400, the influence on the gas in the air supply pipe 400 is reduced, and the efficiency of the cold air delivery in the air supply pipe 400 is improved.

[0048] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for cooling a mine shaft, characterized in that, Includes the following steps: S1. Based on the depth of the shaft (100), install an air supply duct (400) with a built-in first fan (410) inside the shaft (100), and install an exhaust duct (500) with a built-in second fan (510) between the roadway (200) and the ground. S2. Locate the cold source layer along the excavation direction of the vertical shaft (100) and arrange a heat exchange device (300) in the cold source layer. A pumping pipe is installed between the heat exchange device (300) and the air supply pipe (400). The heat exchange device (300) is connected in series with the air supply pipe (400) through the pumping pipe. S3. Install a first refrigeration device (600) at the front end of the heat exchange device (300), and install a second refrigeration device (700) and a first temperature measuring device at the rear end of the heat exchange device (300). Detect the fluid temperature in the air supply duct (400) according to the first temperature measuring device, and transmit a control signal to the second refrigeration device (700) to adjust the refrigeration power of the second refrigeration device (700). When the fluid temperature in the air supply duct (400) exceeds the first threshold, the cooling power of the second refrigeration equipment (700) is increased; when the fluid temperature in the air supply duct (400) is lower than the first threshold, the cooling power of the second refrigeration equipment (700) is reduced. The heat exchange device (300) is arranged in multiple sets around the circumference, and two adjacent sets of heat exchange devices (300) are located at different height positions; Each of the pumping pipes is equipped with a solenoid valve. A second temperature measuring device is installed inside the heat exchange device (300). The second temperature measuring device detects the fluid temperature inside the heat exchange device (300) and sends a control signal to the solenoid valve to control its opening and closing. When the fluid temperature inside the heat exchange device (300) exceeds a second threshold, the solenoid valve is controlled to close. When the fluid temperature inside the heat exchange device (300) is lower than the second threshold, the solenoid valve is controlled to open.

2. The method for cooling a mine shaft according to claim 1, characterized in that, The heat exchange device (300) includes a first heat exchange pipe (310) arranged at an inclination and a second heat exchange pipe (320) arranged at an inclination, and the second ends of the first heat exchange pipe (310) and the second heat exchange pipe (320) meet to form a heat exchange channel.

3. The method for cooling a mine shaft according to claim 2, characterized in that, Two intersecting installation channels are drilled in the inner wall of the cold source layer using a drilling device. After the impurities in the installation channels are extracted under negative pressure, the first heat exchange pipe (310) and the second heat exchange pipe (320) are laid in the predetermined installation channels.

4. A method for cooling a mine shaft according to claim 3, characterized in that, The first heat exchange pipe (310) and the second heat exchange pipe (320) are both made of metal material, and an expandable sealing airbag is installed at the second end of the first heat exchange pipe (310) and the second heat exchange pipe (320). After the first heat exchange pipe (310) and the second heat exchange pipe (320) are fixed, the sealing airbag is controlled to expand in a predetermined direction to form a sealing barrier.

5. A method for cooling a mine shaft according to claim 1, characterized in that, The second refrigeration device (700) is installed near the tunnel (200). The second refrigeration device (700) includes a refrigeration pipe (710) and a heat dissipation pipe (720). The refrigeration pipe (710) is connected in series in the air supply pipe (400), and the heat dissipation pipe (720) extends toward the second fan (510).

6. A method for cooling a mine shaft according to claim 1, characterized in that, The cold source layer mentioned above is a low-temperature rock layer. Before installing the heat exchange device (300), the low-temperature rock layer needs to be subjected to mechanical and acoustic tests. During the installation of the heat exchange device (300), the deformation and stress changes of the low-temperature rock layer need to be detected, and the stability and safety of the low-temperature rock layer need to be evaluated.

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