Deep well resource exploitation heat damage prevention and control and comprehensive utilization method

Abstract

The invention discloses a heat damage prevention and control and comprehensive utilization method for deep well resource exploitation. The method comprises the following steps that heat preservation layers of a stope, a ditch and a water sump and a heat removal pipeline of the stope are designed; according to the design result, heat preservation layers of the stope, the ditch and the water sump and a heat removal pipeline of the stope are installed; when the filling body in the stope begins to release heat, cooling water is introduced into the heat removal pipeline, and the cooling water after heat absorption is guided to the ditch and is discharged into the water sump through the ditch; geothermal gushing water is drained to a ditch and is discharged into a water sump through the ditch; and after the heat of the filling body in the stope is released, the heat removal pipeline is detached. The method is simple in technological process, convenient to construct and low in cost, heat damage can be prevented and controlled, meanwhile, the heat damage can be fully utilized, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the field of mining technology, and in particular to a method for preventing and controlling thermal damage in deep well resource mining and for comprehensive utilization. Background Art

[0002] When mining deep, high-grade ore bodies with unstable surrounding rock, the road-type backfill mining method is often used. However, the heat released by hydration of the backfill in road-type backfill cannot be eliminated, resulting in extremely high temperatures in the stope, sections, and connecting roads, compromising stope operation safety. Deep mines, in particular, pose not only thermal hazards to the backfill but also geothermal hazards (such as geothermal water influx). Therefore, how to manage and utilize both backfill and geothermal hazards has become a pressing need in today's mining industry.

[0003] In the prior art, there are several solutions, but each has certain shortcomings. For example, the Chinese patent with publication number CN115075859A proposes a deep mining ventilation system for metal mines and a method for controlling heat damage therefrom. This method uses ground monitoring to issue remote commands to start and stop underground fans, and uses underground refrigeration machines with mine water as a cold source to achieve underground high-temperature cooling. Although this method can reduce the temperature and humidity of the working environment on the working surface and achieve heat damage control for metal mines, a large number of networks need to be laid underground, and there are many devices in the heat damage control for metal mines, resulting in high material and operating costs. The Chinese patent with publication number CN114837739A proposes a coal-water-heat synergistic mining and water damage and heat damage control system. This system uses a mine water recharge unit to complete heat extraction and an aquifer hydrophobic decompression unit to complete heat exchange. Although this method can achieve the utilization of geothermal energy from mine water inrush and tunnel surrounding rock heat damage, the process is complex and difficult to operate. In addition, the aquifer hydrophobic decompression unit and the heat exchange unit cannot be reused, resulting in high investment costs. A Chinese patent with publication number CN108087013A proposes a mine cooling and heat damage utilization system. The system extracts heat from the tunnel surrounding rock by placing a two-phase closed thermosyphon heat collection and cooling device in the surrounding rock. The system then uses the mine water to absorb the heat collected by the two-phase closed thermosyphon to extract the heat energy from the tunnel surrounding rock and apply the heat energy to surface buildings. Although the structure is simple and can extract heat from the tunnel surrounding rock, the process is complicated and the construction is difficult. In addition, as deep resource mining extends and the heat of the surrounding rock is completely absorbed, the system needs to be rebuilt.

[0004] Based on the above-mentioned deficiencies in the existing technology, there is an urgent need to propose a solution with simple process flow, convenient construction and low cost. Summary of the Invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art. To this end, the present invention proposes a method for preventing and controlling heat damage in deep-well resource mining and its comprehensive utilization. This method has a simple process flow, convenient construction, low cost, and can prevent and control heat damage while fully utilizing it, thus achieving significant economic benefits.

[0006] The method for preventing and controlling thermal damage and comprehensive utilization of deep well resource mining according to an embodiment of the present invention comprises the following steps:

[0007] Design the insulation layer of the stope, water ditch, water tank and the heat extraction pipeline of the stope;

[0008] According to the design results, install the insulation layer of the stope, ditch, water tank and the heat extraction pipe of the stope;

[0009] When the filling body in the stope starts to release heat, cooling water is introduced into the heat extraction pipe, and the cooling water after absorbing heat is drained to the ditch and discharged into the water tank through the ditch;

[0010] diverting the geothermal water to the ditch and discharging it into the water tank through the ditch;

[0011] When the heat release of the filling body in the stope is completed, the heat extraction pipeline is removed.

[0012] The method for preventing and controlling thermal damage and comprehensive utilization of deep well resource mining according to the embodiment of the present invention has the following beneficial effects:

[0013] By installing an insulation layer and a heat extraction pipe to absorb the heat damage of the filling body in the mining area, and by draining the cooling water and geothermal water after absorbing heat in the heat extraction pipe into the ditch and then discharging it into the water tank, not only the heat damage of the filling body and the geothermal heat damage are controlled, but the hot water discharged into the water tank can also be used for thermal energy (the insulation layer of the ditch and the water tank can prevent heat loss). While preventing and controlling heat damage, the heat damage can also be fully utilized, which has significant economic benefits; and by dismantling the heat extraction pipe for recycling, the cost of preventing and controlling heat damage can be greatly reduced; in addition, the method has a simple process flow, convenient construction, and strong practicality.

[0014] According to some embodiments of the present invention, the design of the insulation layer of the stope, ditch, and water tank includes:

[0015] The thickness of the insulation layer is calculated using the following formula:

[0016]

[0017] Where ξ0 is the calculated thickness of the insulation layer, m; λ is the thermal conductivity of the insulation material, W / (m·k); ΔT0 is the temperature difference between the outer surface of the insulation layer and the ambient temperature in the stope, °C; q is the maximum allowable heat flux, W / m 2 ;

[0018] The actual thickness of the insulation layer is calculated using the following formula:

[0019]

[0020] Where ξ is the actual thickness of the insulation layer, m; k is the safety factor of the thickness of the insulation layer.

[0021] According to some embodiments of the present invention, the design of the heat extraction pipeline in the mining area includes:

[0022] The heat release of the filling body in the stope is calculated using the following formula:

[0023] Q f =m(c·ΔT+H),

[0024] Where Q f is the heat release of the filling body, J; m is the mass of the filling body, kg; c is the specific heat capacity of the filling body, J / (kg·k); ΔT is the temperature change of the filling body, °C; H is the curing heat of the filling body, J / kg;

[0025] The diameter of the heat extraction pipe is calculated using the following formula:

[0026] Q f =ρ·Q v c v ΔT v ,

[0027] Q v =π·r 2 v,

[0028]

[0029] Where Q v is the volume flow rate at the cross section of the heat extraction pipe, m 3 / s; ρ is the density of cooling water in the heat extraction pipe, kg / m 3 ;c v is the specific heat capacity of cooling water, J / (kg·k); ΔT v is the temperature difference between the inlet and outlet water in the heat extraction pipe, ℃; v is the flow rate of cooling water in the heat extraction pipe, m / s; d is the diameter of the heat extraction pipe, m; r is the radius of the heat extraction pipe, m.

[0030] According to some embodiments of the present invention, the design of the heat extraction pipeline in the mining area further includes:

[0031] The length of the heat extraction pipe is calculated using the following formula:

[0032]

[0033] Where L is the length of the heat pipe, m; Q is the heat absorbed by the heat pipe, J, Q = Q f ; U is the total heat transfer coefficient, W / (m 2 ·K); ΔT m is the logarithmic mean temperature difference, ℃.

[0034] According to some embodiments of the present invention, the insulation layer of the designed mining area includes: designing an insulation layer at the top of the mining area, and designing a supporting layer on the insulation layer at the top of the mining area; the heat extraction pipeline of the designed mining area includes: designing a first pipeline passing through the supporting layer and the insulation layer at the top of the mining area, and a second pipeline located at the opening of the mining area access and detachably connected to the first pipeline.

[0035] According to some embodiments of the present invention, lubricating oil is applied to a side of the supporting layer in contact with the first pipe.

[0036] According to some embodiments of the present invention, the supporting layer is a flexible structure.

[0037] According to some embodiments of the present invention, the method for preventing and controlling thermal damage and comprehensive utilization of deep well resource mining further includes the following steps:

[0038] The hot water in the water tank with a temperature higher than 70°C is used for geothermal power generation for use underground; the hot water in the water tank with a temperature lower than 70°C is pumped to the surface for use in industrial drying and heating.

[0039] According to some embodiments of the present invention, the insulation layer of the stope is made of EPS board, and the insulation layers of the ditch and the water tank are made of XPS board.

[0040] According to some embodiments of the present invention, the heat extraction pipe is made of one of PEX pipe, PERT pipe and PB pipe.

[0041] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0043] Figure 1 This is a flow chart of a method for preventing and controlling thermal damage and comprehensive utilization of deep well resource mining according to an embodiment of the present invention;

[0044] Figure 2 is a schematic diagram of a thermal insulation layer in a stope according to an embodiment of the present invention;

[0045] Figure 3Schematic diagram of cooling water from a heat extraction pipe being diverted to a ditch according to an embodiment of the present invention;

[0046] Figure 4 It is a structural schematic diagram of a heat extraction pipeline according to an embodiment of the present invention.

[0047] Figure Number:

[0048] Stope 100, access opening 101, ditch 110;

[0049] Insulation layer 200;

[0050] Heat extraction pipe 300 , water inlet 301 , water outlet 302 , first pipe 310 , second pipe 320 , first sleeve 330 , second sleeve 340 . DETAILED DESCRIPTION

[0051] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0052] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientation or positional relationship indicated by up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In the description of the present invention, "a plurality" refers to more than two. The use of "first" or "second" is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0054] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0055] Reference Figures 1 to 4 A method for preventing and controlling heat damage in deep well resource mining and comprehensive utilization according to an embodiment of the present invention includes the following steps:

[0056] Design of the stope 100, the ditch 110, the insulation layer 200 of the water tank, and the heat extraction pipe 300 of the stope 100;

[0057] According to the design results, the insulation layer 200 is installed in the stope 100, the ditch 110, and the water tank, as well as the heat extraction pipe 300 in the stope 100. The insulation layer 200 can prevent the heat damage from deep mining from escaping, ensure the safety of underground operations, and also contain heat.

[0058] When the filling in the stope 100 begins to release heat, cooling water is introduced into the heat extraction pipe 300 to absorb the heat released by the filling. The absorbed cooling water is then drained to the ditch 110 and discharged into the water tank through the ditch 110, thereby transferring the heat of the filling to the water tank.

[0059] The geothermal water is diverted to the ditch 110 and discharged into the water tank through the ditch 110, thereby transferring the heat of the geothermal water to the water tank;

[0060] After the heat release of the filling body in the stope is completed, the heat extraction pipe 300 is removed so as to be reused in the next stope 100.

[0061] The method for preventing and controlling heat damage and comprehensively utilizing heat damage in deep-well resource mining according to an embodiment of the present invention installs an insulation layer 200 and a heat extraction pipe 300 to absorb heat damage to the filling body in the mining field 100, and drains the cooling water and geothermal water after absorbing heat in the heat extraction pipe 300 to the ditch 110 and then discharges them into the water tank. This not only controls the heat damage to the filling body and the geothermal heat damage, but also the hot water discharged into the water tank can be utilized for thermal energy (the insulation layer 200 of the ditch 110 and the water tank can prevent heat loss). While preventing and controlling heat damage, it can also make full use of the heat damage, which has significant economic benefits. Moreover, by dismantling the heat extraction pipe 300 for recycling, the cost of preventing and controlling heat damage can be greatly reduced. In addition, the method has a simple process flow, convenient construction, and strong practicality.

[0062] It is understandable that the thickness of the insulation layer 200 is a key parameter to ensure that the heat in the filling body, the ditch 110 and the water tank is not dissipated, so the thickness of the insulation layer 200 needs to be calculated.

[0063] Based on this, in some embodiments of the present invention, designing the insulation layer 200 of the mining area 100, the ditch 110, and the water tank includes: selecting a suitable material for the insulation layer 200, calculating the thickness value of the insulation layer 200, and calculating the actual thickness value of the insulation layer 200.

[0064] It is understood that the material of the insulation layer 200 must take into account factors such as thermal insulation performance, price, construction difficulty, and durability. In this embodiment, the insulation layer 200 of the stope 100 is made of EPS (polystyrene board), while the insulation layer 200 of the ditch 110 and the water tank is made of XPS (extruded polystyrene board). When installing the insulation layer 200, it can be fixed to the inner walls of the stope 100, the inner walls of the ditch 110, and the inner walls of the water tank using long nails.

[0065] The thickness of the insulation layer is calculated using the following formula:

[0066]

[0067] Where ξ0 is the calculated thickness of the insulation layer, in m; λ is the thermal conductivity of the insulation material, in W / (m·k); ΔT0 is the temperature difference between the outer surface of the insulation layer and the ambient temperature in the stope, in °C; q is the maximum allowable heat flux, in W / m 2 , generally 30~50W / m 2 ;

[0068] The actual thickness should be calculated based on a certain safety factor to account for material aging and installation errors. Therefore, the following formula is used to calculate the actual thickness of the insulation layer:

[0069]

[0070] Where ξ is the actual thickness of the insulation layer, in meters; k is the thickness safety factor of the insulation layer, which is generally taken as 1.1 to 1.2 according to national safety standards.

[0071] It should be noted that when the materials of the insulation layer 200 of the stope 100, the ditch 110 and the water tank are different, the thermal conductivity coefficients of the corresponding materials are different, so the actual values ​​of the thickness of the insulation layer are also different and need to be calculated separately.

[0072] In some embodiments of the present invention, designing the heat extraction pipe 300 of the stope 100 includes: selecting appropriate materials for the heat extraction pipe 300, calculating the heat release of the filling body in the stope, calculating the diameter of the heat extraction pipe 300, and calculating the length of the heat extraction pipe 300.

[0073] It is understandable that the heat extraction pipe 300 needs to be flexible, temperature-resistant (-10 to 90°C), not easily deformed under long-term pressure, and cost-effective. Therefore, in some embodiments, the heat extraction pipe 300 can be made of a plastic hose, specifically one or more of PEX pipe (cross-linked polyethylene pipe), PERT pipe (high-temperature resistant polyethylene pipe), and PB pipe (polybutylene pipe); of course, the material of the heat extraction pipe 300 is not limited to the above-mentioned materials.

[0074] It is understandable that the heat released by hydration and the subsequent solidification of the filling body play a dominant role in the heat release of the underground filling body. Therefore, after mining, the influence of the environment on the hydration reaction of the filling body is ignored, and the heat load formula is used to calculate the heat release of the filling body during hydration and solidification. That is, the heat release of the filling body is calculated using the following formula:

[0075] Q f =m(c·ΔT+H),

[0076] Where Q f is the heat release of the filling body, in J; m is the mass of the filling body, in kg; c is the specific heat capacity of the filling body, in J / (kg·k), generally 800-1000 J / (kg·k); ΔT is the temperature change of the filling body, in °C; H is the curing heat of the filling body, in J / kg, generally 300-500 J / kg;

[0077] According to the calculated heat release of the filling body, all of this heat should be absorbed by the cooling water in the heat extraction pipe 300. Therefore, the diameter of the heat extraction pipe 300 is calculated using the following formula:

[0078] Q f =ρ·Q v c v ΔT v ,

[0079] Q v =π·r 2 v,

[0080]

[0081] Where Q v is the volume flow rate of the cross section in the heat pipe, in m 3 / s; ρ is the density of cooling water in the heat extraction pipe, unit is kg / m 3 ;c v is the specific heat capacity of cooling water, in J / (kg·k); ΔT v is the temperature difference between the inlet and outlet water in the heat extraction pipe, in °C; v is the flow rate of cooling water in the heat extraction pipe, in m / s; d is the diameter of the heat extraction pipe, in m; r is the radius of the heat extraction pipe, in m.

[0082] After calculating the diameter of the heat extraction pipe 300, it is also necessary to calculate the length of the heat extraction pipe 300. The specific process is as follows:

[0083] The heat transfer equation of pipe absorption is expressed as follows:

[0084] Q=U·A·ΔT m ,

[0085] Where Q is the heat absorbed by the heat pipe, the unit is J, Q = Q f ; U is the total heat transfer coefficient, unit is W / (m 2 K), which depends on the pipe material, fluid properties and environment, and needs to be obtained through experiments or engineering manuals. Plastic hoses are generally 5-30W / (m 2 ·K); A is the heat absorbing surface area of ​​the heat extraction pipe, in m 2 ; ΔT mis the logarithmic mean temperature difference, in °C;

[0086] In addition, U, A, ΔT m It is expressed as follows:

[0087]

[0088] A=π·d·L,

[0089]

[0090] Where h i is the convection heat transfer coefficient inside the pipe, in W / (m 2 ·K), cold water under forced convection generally takes 1000W / (m 2 ·K); δ is the pipe wall thickness, in m. The wall thickness of plastic hose is usually 1-3 mm. h0 is the convection heat transfer coefficient outside the pipe, in W / (m 2 ·K), the air is generally 15-20W / (m 2 ·K); λ is the thermal conductivity of the pipe material, in W / (m·K). The thermal conductivity of plastic hoses is generally 0.1~0.5W / (m·K); L is the length of the heat extraction pipe, in m.

[0091] From the above formula, it can be deduced that the length of the heat extraction pipe 300 is calculated using the following formula:

[0092]

[0093] In some embodiments of the present invention, the insulation layer 200 of the mining field 100 is designed to include: the insulation layer 200 at the top of the mining field 100 is designed, and a supporting layer is designed on the insulation layer 200 at the top of the mining field 100; the heat extraction pipeline 300 of the mining field 100 is designed to include: a first pipeline 310 designed to pass through the supporting layer and the insulation layer 200 at the top of the mining field 100, and a second pipeline 320 located at the access opening 101 of the mining field 100 and detachably connected to the first pipeline 310, that is, the heat extraction pipeline 300 includes the first pipeline 310 and the second pipeline 320.

[0094] In this embodiment, by respectively setting the first pipe 310 and the second pipe 320 at the top of the stope 100 and the access opening 101, on the one hand, the heat absorption effect can be ensured, and on the other hand, the top of the stope 100 and the access opening 101 are less disturbed by the filling body, and the pipe recovery is convenient.

[0095] It can be understood that in order to facilitate the recovery of the first pipeline 310, the installation of the supporting layer should meet the requirement that the first pipeline 310 can be pulled out from between the supporting layer and the insulation layer 200 along the length direction of the mining area 100, that is, an installation space is defined between the supporting layer and the insulation layer 200 at the top of the mining area, and the installation space reserves gaps on both sides of the length direction of the mining area 100 for the first pipeline 310 to pass through. In this way, when removing the first pipeline 310, the second pipeline 320 can be removed first, and then the first pipeline 310 can be pulled out along the length direction of the mining area 100.

[0096] It is conceivable that a plurality of first pipes 310 can be provided, which are arranged at intervals along the width direction of the mining field 100, and the ends of the plurality of first pipes 310 away from the access opening 101 can be connected by a first sleeve 330, and the diameter of the first sleeve 330 is larger than the diameter of the first pipe 310; a plurality of second pipes 320 can also be provided, which are arranged at intervals along the width direction of the mining field 100, and the diameters of the first pipe 310 and the second pipe 320 are the same, and the first pipe 310 and the second pipe 320 are connected by a second sleeve 340, and the diameter of the second sleeve 340 is larger than the diameter of the first pipe 310.

[0097] Obviously, according to the calculated length of the heat extraction pipe 300 and the length, width and height of the stope 100 , the number of the first pipes 310 and the second pipes 320 required to be laid can be calculated.

[0098] In some embodiments of the present invention, lubricating oil is applied to the side of the supporting layer that contacts the first pipe 310 . Thus, when the first pipe 310 is removed, the pulling resistance is small and the removal operation is smoother.

[0099] In some embodiments of the present invention, the supporting layer is a flexible structure, which can be cloth, sacks, etc., and there can be multiple of them. During installation, it can be covered on the insulation layer 200 and then nailed to the insulation layer 200 with multiple millet nails. The number of millet nails must meet the requirement that the supporting layer and the first pipe 310 will not fall off.

[0100] Based on the above embodiments, it can be imagined that the insulation layer 200 and the heat extraction pipe 300 on the top of the mining site 100 can be installed in two orders. One is to first install the insulation layer 200 on the inner wall of the mining site 100, and then install the first pipe 310 through the supporting layer, and finally connect the second pipe 320 to the first pipe 310; the other is to first install the first pipe 310 on the insulation layer 200 through the supporting layer before installing the insulation layer 200, and then install the insulation layer 200 to the inner wall of the mining site 100, and finally connect the second pipe 320 to the first pipe 310.

[0101] The following example uses a sack as the supporting layer and adopts the second installation sequence mentioned above.

[0102] During installation, the operation is first carried out on the surface, and sacks are covered on the insulation layer 200, and then nailed to the insulation layer 200 with multiple small nails. The first pipe 310 is then passed through between the sacks and the insulation layer 200. After the installation is completed, it is lifted to the site and the insulation layer 200 is installed on the inner wall of the mining area 100. After the insulation layer 200 is installed, the second pipe 320 is connected to the first pipe 310.

[0103] In some embodiments of the present invention, the method for preventing and controlling heat damage and comprehensively utilizing deep-well resource mining also includes the following steps: using hot water above 70°C in the water tank for geothermal power generation for use underground; pumping hot water below 70°C in the water tank to the surface for industrial drying and heating, thereby making full use of heat damage.

[0104] To better understand this solution, the following describes a method for preventing and controlling heat damage and comprehensively utilizing deep-well resource mining according to a specific embodiment of the present invention, taking an approach-type rectangular stope (stope length of 20 to 30 meters) as an example. The method includes the following steps:

[0105] Step 1: Design the insulation layer 200 of the mine 100, the ditch 110, the water tank, and the heat extraction pipeline 300 of the mine 100; wherein, the insulation layer 200 of the mine 100 is designed to include: the insulation layer 200 on the top of the mine 100, on both sides in the width direction of the mine 100, and on the side of the mine 100 away from the access opening 101 in the length direction of the mine 100, and a supporting layer is designed on the insulation layer 200 on the top of the mine 100; the heat extraction pipeline 300 of the mine is designed to include: a first pipeline 310 designed to pass between the supporting layer and the insulation layer 200 on the top of the mine 100, and a second pipeline 320 located at the access opening 101 of the mine 100 and detachably connected to the first pipeline 310.

[0106] The specific process is as follows: first, suitable materials are selected for the insulation layer 200, the heat extraction pipe 300, and the supporting layer. Then, the actual thickness of the insulation layer 200 (the mining site 100, the ditch 110, and the water tank), the diameter of the heat extraction pipe 300, and the length of the heat extraction pipe 300 are calculated using the above formulas. After the calculation, the materials are manufactured. In this embodiment, the insulation layer 200 of the mining site 100 is made of EPS board, the insulation layer 200 in the ditch 110 and the water tank is made of XPS board, the heat extraction pipe 300 is made of plastic hose, and one of PEX pipe, PERT pipe, and PB pipe is selected. The supporting layer is made of burlap bag.

[0107] Step 2: Install the insulation layer 200 and the heat extraction pipe 300 of the stope 100 .

[0108] The specific process is as follows: during installation, first operate on the surface, apply lubricating oil on the sack, cover the sack on the insulation layer 200 (the insulation layer 200 needs to be installed on the top of the mining site 100), then use multiple millet nails to nail the sack on the insulation layer 200, and then pass the first pipe 310 between the sack and the insulation layer 200. After the installation is completed, the insulation layer 200 with the first pipe 310 installed and other insulation layers 200 are lifted to the site and installed on the inner wall of the mining site 100. After the insulation layer 200 is installed, the second pipe 320 is connected to the first pipe 310.

[0109] Step 3: Install the insulation layer 200 of the ditch 110 and the water tank; specifically, the insulation layer 200 can be fixed to the inner wall of the ditch 110 and the inner wall of the water tank using long nails.

[0110] Step 4: When the filling body in the mining area 100 begins to release heat, cooling water is introduced into the heat extraction pipe 300 from the water inlet 301 of the heat extraction pipe 300 to absorb the heat released by the filling body, and the heat-absorbing cooling water flowing out of the water outlet 302 is drained to the ditch 110 and discharged into the water tank through the ditch 110; at the same time, the geothermal water is drained to the ditch 110 and discharged into the water tank through the ditch 110.

[0111] Step 5: Use the hot water above 70°C in the water tank for geothermal power generation for use underground; pump the hot water below 70°C in the water tank to the surface for industrial drying and heating, making full use of heat damage.

[0112] Step 6: After the heat release of the filling material in the stope 100 is complete, the heat extraction pipe 300 is removed for reuse in the next stope. The specific operation is: first remove the second pipe 320, then pull the first pipe 310 along the length of the stope 100 at the access opening 101.

[0113] It should be noted that the above provides the steps of one specific embodiment, and in actual application, they can be adjusted according to actual conditions. For example, step 2 and step 3 can be performed simultaneously to save time.

[0114] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. A method for preventing and controlling heat damage in deep well resource mining and comprehensive utilization, characterized in that: The steps include: Design the insulation layer of the stope, water ditch, water tank and the heat extraction pipeline of the stope; According to the design results, install the insulation layer of the stope, ditch, water tank and the heat extraction pipe of the stope; When the filling body in the stope starts to release heat, cooling water is introduced into the heat extraction pipe, and the cooling water after absorbing heat is drained to the ditch and discharged into the water tank through the ditch; diverting the geothermal water to the ditch and discharging it into the water tank through the ditch; When the heat release of the filling body in the stope is completed, the heat extraction pipeline is removed.

2. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The insulation layer of the designed stope, ditch and water tank includes: The thickness of the insulation layer is calculated using the following formula: Where ξ0 is the calculated thickness of the insulation layer, m; λ is the thermal conductivity of the insulation material, W / (m·k); ΔT0 is the temperature difference between the outer surface of the insulation layer and the ambient temperature in the stope, °C; q is the maximum allowable heat flux, W / m 2 ; The actual thickness of the insulation layer is calculated using the following formula: Where ξ is the actual thickness of the insulation layer, m; k is the safety factor of the thickness of the insulation layer.

3. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The heat extraction pipeline of the designed stope includes: The heat release of the filling body in the stope is calculated using the following formula: Q f =m(c·ΔT+H), Where Q f is the heat release of the filling body, J; m is the mass of the filling body, kg; c is the specific heat capacity of the filling body, J / (kg·k); ΔT is the temperature change of the filling body, °C; H is the curing heat of the filling body, J / kg; The diameter of the heat extraction pipe is calculated using the following formula: Q f =ρ·Q v ·c v ·ΔT v , Q v =π·r 2 ·v, Where Q v is the volume flow rate at the cross section of the heat extraction pipe, m 3 / s; ρ is the density of cooling water in the heat extraction pipe, kg / m 3 ;c v is the specific heat capacity of cooling water, J / (kg·k); ΔT v is the temperature difference between the inlet and outlet water in the heat extraction pipe, ℃; v is the flow rate of cooling water in the heat extraction pipe, m / s; d is the diameter of the heat extraction pipe, m; r is the radius of the heat extraction pipe, m.

4. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 3, characterized in that: The heat extraction pipeline of the designed stope also includes: The length of the heat extraction pipe is calculated using the following formula: Where L is the length of the heat pipe, m; Q is the heat absorbed by the heat pipe, J, Q = Q f ; U is the total heat transfer coefficient, W / (m 2 ·K); ΔT m is the logarithmic mean temperature difference, ℃.

5. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The designing of the thermal insulation layer of the stope includes: designing the thermal insulation layer at the top of the stope, and designing a supporting layer on the thermal insulation layer at the top of the stope; The heat extraction pipeline of the designed mining field includes: a first pipeline designed to pass through the supporting layer and the insulation layer on the top of the mining field, and a second pipeline located at the opening of the mining field access and detachably connected to the first pipeline.

6. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 5, characterized in that: The side of the supporting layer in contact with the first pipe is coated with lubricating oil.

7. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 5, characterized in that: The supporting layer is a flexible structure.

8. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The method for preventing and controlling heat damage from deep well resource mining and comprehensive utilization also includes the following steps: The hot water in the water tank with a temperature higher than 70°C is used for geothermal power generation for use underground; the hot water in the water tank with a temperature lower than 70°C is pumped to the surface for use in industrial drying and heating.

9. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The insulation layer of the stope is made of EPS board, and the insulation layers of the ditch and the water tank are made of XPS board.

10. The method for preventing and controlling heat damage and comprehensive utilization of deep well resource mining according to claim 1, characterized in that: The heat extraction pipe adopts one of PEX pipe, PERT pipe and PB pipe.

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