Mine waste heat resource cascade recovery system and application method thereof

Abstract

The application discloses a mine waste heat resource cascade recovery system and an application method thereof, and relates to the field of mine waste heat resource cascade recovery systems.The system comprises a mine water multi-stage utilization system and a refrigeration system located in a mine, and a heating system located on the ground of a mine area; the mine water multi-stage utilization system comprises a mine water heat exchange pool, a heat exchange coil is arranged in the mine water heat exchange pool, a physical desilting device is arranged at the water inlet end of the mine water heat exchange pool, a working face spraying device is arranged at the water outlet end of the mine water heat exchange pool, and a chemical purification device is arranged at the side of the mine water heat exchange pool; a plate heat exchanger is connected between the refrigeration system and the heat exchange coil, and the heating system is connected with the heat exchange coil and the plate heat exchanger.The application can be effectively applied in mine waste heat resource cascade recovery, realizes mine waste heat resource cascade recovery, reasonably utilizes the grade characteristics of waste heat resources, can simultaneously complete waste heat extraction, spraying cooling, filling backfilling and other work, has good use effect, and is convenient to popularize and use.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mine waste heat recovery, and particularly relates to a mine waste heat resource cascade recovery system and an application method thereof. BACKGROUND

[0002] With the improvement of people's living standards, the mining depth of mines is increasing, but many problems are faced. Specifically:

[0003] (1) High-temperature geothermal frequently occurs, mainly in mine hot water gushing, which brings great harm to mine production and personnel health. The condensing heat emission of the introduced underground centralized air conditioning system is also a key problem, and the large amount of heat emission of the condenser easily causes chamber heat damage, which not only reduces the refrigeration efficiency of the equipment, but also endangers the health of the operators.

[0004] (2) Mine water has a stable temperature, which is a very suitable waste heat resource for continuous heating of mine area domestic water. However, a large amount of silt, sand and coal powder contained in the mine water easily blocks the heat exchange coil, and the traditional cleaning equipment has complex process and low efficiency. The slow water quality purification process will cause the heat loss of mine water.

[0005] (3) The mine water sump commonly used in mines has slow sedimentation, and needs frequent manual desilting, which is low in efficiency and time-consuming and laborious.

[0006] (4) Large-scale and high-intensity mining brings many goaf areas, and in order to prevent surface subsidence and induce earthquakes, the goaf areas need to be treated in time and with plan. The relatively safe treatment method is to fill the goaf area with water and silt. Transporting backfill materials for deep mines will cause high consumption of manpower and resources.

[0007] (5) The temperature of the mine tunneling working face is high, and is accompanied by a large amount of dust affecting the vision and breathing of workers. Low-temperature spraying can effectively improve this situation; at the same time, the traditional mine water sump needs to continuously discharge mine water to maintain the water level. Transporting water from the ground to the underground needs to consume a large amount of resources. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a mine waste heat resource cascade recovery system, which has simple system structure, reasonable design, convenient implementation, and can be effectively applied in mine waste heat resource cascade recovery, realize mine waste heat resource cascade recovery, especially multi-stage utilization of mine water resources, proper process connection, convenient implementation, reasonable utilization of waste heat resource grade characteristics, can complete waste heat extraction, spraying cooling and filling backfilling at the same time, has good use effect, and is convenient for popularization and use.

[0009] To solve the above technical problems, the technical scheme adopted by the present application is: a mine waste heat resource cascade recovery system, comprising a mine water multi-stage utilization system and a refrigeration system located in a mine, and a heating system located on the ground of a mine area; the mine water multi-stage utilization system comprises a mine water heat exchange pool, a heat exchange coil is arranged in the mine water heat exchange pool, a physical desilting device is arranged at the water inlet end of the mine water heat exchange pool, a working face spraying device is arranged at the water outlet end of the mine water heat exchange pool, and a chemical purification device is arranged on the side of the mine water heat exchange pool; a plate heat exchanger is connected between the refrigeration system and the heat exchange coil, and the heating system is connected with the heat exchange coil and the plate heat exchanger.

[0010] The physical desilting device of the mine waste heat resource cascade recovery system comprises a purification box arranged at the top of the mine water heat exchange pool, a sand and stone treatment bin arranged on one side of the mine water heat exchange pool, and a sand removing mechanism arranged on the other side of the mine water heat exchange pool; a mine water inlet is arranged at the top of the purification box, a coarse filter screen, a steel bar and a fine filter screen are sequentially and spacedly arranged in the purification box from top to bottom, a spring is vertically arranged between the coarse filter screen and the steel bar, and a slide is arranged on the fine filter screen; a first sand and stone filter screen and a second sand and stone filter screen are arranged in the sand and stone treatment bin, a vibration mechanism is connected between the first sand and stone filter screen and the second sand and stone filter screen, a first crushing roller is arranged above the first sand and stone filter screen, a second crushing roller is arranged above the second sand and stone filter screen, and a sand and stone collecting pool is arranged at the bottom of the sand and stone treatment bin; a sand and stone conveying pipeline is connected to the side of the sand and stone collecting pool, and a mud pump is arranged on the sand and stone conveying pipeline.

[0011] The first sand and stone filter screen is inclined, and one end of the first sand and stone filter screen is fixed to the outer wall of the purification box through a first fixing member; the second sand and stone filter screen is horizontally arranged, and one end of the second sand and stone filter screen is fixed to the inner wall of the sand and stone treatment bin through a second fixing member.

[0012] The vibration mechanism comprises a connecting rod and a chute arranged at the middle position of the connecting rod; one end of the connecting rod is connected to the other end of the first sand and stone filter screen, the other end of the connecting rod is connected to the other end of the second sand and stone filter screen, a first vibration spring is sleeved on the connecting rod close to the first sand and stone filter screen, a second vibration spring is sleeved on the connecting rod close to the second sand and stone filter screen, a vibration motor is arranged in the chute, and a counterweight capable of sliding along the chute is connected to the output shaft of the vibration motor.

[0013] The sand removing mechanism comprises a first gear, a second gear, a third gear, a spring driving rod and a hinged rod, the first gear and the second gear are engaged, the second gear and the third gear are coaxially connected, one end of the spring driving rod is connected to the first gear through the hinged rod, and the other end of the spring driving rod is connected to the coarse filter screen.

[0014] The chemical purification device comprises a chemical reagent box, an L-shaped rack and a push disc, the chemical reagent box is arranged on the outer wall of the mine water heat exchange pool, a press switch is arranged on the outer side of the chemical reagent box, a nozzle is arranged on the inner side of the chemical reagent box in the mine water heat exchange pool, and a chemical purification agent is stored in the chemical reagent box; the L-shaped rack is engaged with the third gear, the push disc is arranged on the fine filter screen and can slide along the slide, one end of the L-shaped rack is connected to the push disc, the other end of the L-shaped rack can approach and press the press switch along with the movement of the L-shaped rack, and the bottom of the push disc is connected to a stirring rod in the mine water heat exchange pool.

[0015] The refrigeration system comprises a condenser and an evaporator, a first circulating pipe and a second circulating pipe are connected between the condenser and the evaporator, a circulating pump is arranged on the first circulating pipe, and a valve is arranged on the second circulating pipe, the plate heat exchanger comprises a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet, the hot fluid inlet and the hot fluid outlet are communicated with the condenser, the cold fluid inlet is communicated with the heat exchange coil, the cold fluid outlet is communicated with the heat supply system through an upward pipeline, and a medium pump is arranged on the upward pipeline.

[0016] The heat supply system comprises a heat pump unit and a heat supply user end, a heat supply pipeline and a circulating backwater pipe are connected between the heat pump unit and the heat supply user end, the heat pump unit is communicated with the heat exchange coil through a downward pipeline, and a heat exchange medium is filled in the downward pipeline.

[0017] The application further discloses an application method of the mine waste heat resource gradient recovery system.

[0018] When the mine water with sludge and sand enters the purification box from the mine water inlet, the large-particle sludge and sand are retained on the coarse filter screen under the action of gravity, and the small fine sand and coal powder are retained on the fine filter screen through fine filtration.

[0019] Step A2, the double-physical-filtered mine water enters the mine water heat exchange pool, still retaining most of the heat, the mine water and the heat exchange medium filled in the heat exchange coil counterflow heat exchange, the mine water temperature decreases, and the heat exchange medium temperature increases;

[0020] Step A3, the weight of the sludge and sand accumulated on the coarse filter screen gradually increases, the spring deforms, the coarse filter screen near the sand treatment bin end tilts downward, and the sludge and sand slides into the sand treatment bin along the tilted coarse filter screen; at the same time, the coarse filter screen pulls the spring driving rod and the articulated rod, the articulated rod drives the first gear to rotate, the first gear drives the second gear and the third gear to rotate, the third gear drives the L-shaped rack to move, and the L-shaped rack pushes the disc to move towards the sand treatment bin;

[0021] Step A4, the sludge and sand are crushed into fine sand under the action of the first crushing roller, filtered through the first sand filter screen in vibration, and enter the sand collection pool, and the unfiltered sand slides down along the inclined first sand filter screen, is crushed again under the action of the second crushing roller, and is filtered through the second sand filter screen in vibration, and enters the sand collection pool; at the same time, the fine sand on the fine filter screen and the coal powder are pushed to the sand treatment bin by the disc, and the fine sand in the sand collection pool is transported to the mine filling area under the action of the slurry pump to perform automatic filling and backfilling work;

[0022] Step A5, with the movement of the L-shaped rack, the L-shaped rack end presses the push switch, the nozzle in the mine water heat exchange pool injects chemical purification reagent into the mine water, the stirring rod connected with the bottom of the disc moves in the mine water heat exchange pool with the disc, stirs the chemical purification reagent and the mine water, accelerates the chemical reaction speed of the chemical purification reagent and the metal ions in the mine water, and performs chemical purification while heat exchange of the mine water;

[0023] Step A6, the low-temperature mine water after chemical purification and heat extraction is transported to the working face spraying device to perform dust removal and cooling for the working face, and reduces the risk of nozzle blockage of the working face spraying device.

[0024] The application method of the mine waste heat resource cascade recovery system also includes a method for determining the total heat extraction amount of the mine waste heat resource cascade recovery system and the inlet flow of the heat exchange medium in the plate heat exchanger, and the specific process includes:

[0025] Step B1, determining the first heat extraction amount of the heat exchange medium from the mine water heat exchange pool;

[0026] Q1=KlΔt m ′

[0027]

[0028]

[0029]

[0030]

[0031] In the formula, Q1 is the first heat extracted by the heat exchange medium from the mine water heat exchange pool, K is the heat exchange coefficient per unit length of the heat exchange coil, L is the length of the coil, Δt′ m is the logarithmic mean temperature difference between the mine water and the heat exchange medium, t w is the inlet water temperature of the mine water, t1 is the inlet temperature of the heat exchange medium in the mine water heat exchange pool, t2 is the outlet temperature of the heat exchange medium in the mine water heat exchange pool, h1 is the convective heat exchange coefficient on the side of the heat exchange medium in the heat exchange coil, h2 is the convective heat exchange coefficient on the side of the mine water outside the heat exchange coil, R e1 is the Reynolds number of the heat exchange medium, R e2 is the Reynolds number of the mine water, P r1 is the Prandtl number of the heat exchange medium, P r2 is the Prandtl number of the mine water, P rw is the Prandtl number of the outer wall of the heat exchange coil, d1 is the outer diameter of the heat exchange coil, d2 is the inner diameter of the heat exchange coil, λ1 is the thermal conductivity of the heat exchange medium, λ2 is the thermal conductivity of the mine water, and λ3 is the thermal conductivity of the pipe wall.

[0032] Step B2, determining the second heat exchange quantity extracted by the heat exchange medium from the condensation heat and the inlet flow rate of the heat exchange medium in the plate heat exchanger.

[0033] Q2 = c p ′V c ρ′(t c ′-t c ″)

[0034]

[0035] In the formula, Q2 is the second heat exchange quantity extracted by the heat exchange medium from the condensation heat recovery system, V c is the inlet flow rate of the hot fluid side of the plate heat exchanger, V is the inlet flow rate of the heat exchange medium in the plate heat exchanger, c′ p is the constant-pressure specific heat capacity of the inlet medium of the hot fluid side of the plate heat exchanger, c p is the constant-pressure specific heat capacity of the heat exchange medium, ρ′ is the density of the inlet medium of the hot fluid side of the plate heat exchanger, ρ is the density of the heat exchange medium, t′ c is the inlet temperature of the hot fluid side of the plate heat exchanger, t″ c is the outlet temperature of the hot fluid side of the plate heat exchanger, t2 is the inlet temperature of the heat exchange medium, and t3 is the outlet temperature of the heat exchange medium.

[0036] Step B3, determining the total heat exchange quantity Q extracted by the mine waste heat resource cascade recovery system from the underground cascade, Q = Q1 + Q2.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] 1、The mine residual heat resource gradient recovery system based on geothermal energy extraction technology, through the setting of the device for extracting heat in steps, realizes the utilization of mine residual heat, fully utilizes the characteristics of the energy grade of the mine water residual heat and the condensation heat of the underground refrigeration chamber, reasonably extracts heat according to the order of the heat grade, can fully utilize the characteristics of the two kinds of residual heat resources, and can reduce the underground temperature while continuously supplying heat to the ground mine area.

[0039] 2、The mine residual heat resource gradient recovery system fully utilizes the original equipment and idle space in the underground, the system is combined compactly, and great convenience is provided for the implementation scheme: the mine water automatic heat exchange and desilting device is located in the goaf and is connected with the original working face spraying device in the underground; the plate heat exchanger is connected with the original refrigeration unit of the underground refrigeration chamber; the downward pipeline and the upward pipeline are respectively located in two original underground roadways; the mine water multi-stage utilization system is combined compactly and is convenient to implement, and can automatically and simultaneously complete the residual heat extraction, spraying cooling and filling backfilling.

[0040] 3、The mine water automatic heat exchange and desilting device has simple and convenient procedures, the device of physical filtration and chemical precipitation achieves the effect of integration, the physical desilting is accelerated by stirring to speed up the chemical reaction speed, the efficiency of the double physical filtration and chemical precipitation is high and the time is short, the original silt and gravel in the mine water during heat exchange is prevented from blocking the pipe heat coil, the service life of the heat exchange equipment is effectively prolonged and the heat exchange efficiency is improved, the efficient physical filtration also makes the heat loss of the mine water before entering the heat exchanger less, and the original water temperature is maintained as much as possible.

[0041] 4、The mine water automatic heat exchange and desilting device does not need frequent manual desilting, and can achieve the effect of automatic cleaning in the state of continuous water inflow, reduces energy and manpower consumption; the silt and gravel obtained by desilting is automatically pumped into the goaf backfilling drilling hole by the slurry pump, not only improves the treatment efficiency of the mine water filtration material, but also completes the goaf backfilling work, avoids the loss of transportation of backfilling materials from the ground to the underground, and guarantees the geological safety of the mine area.

[0042] 5、The mine water multi-stage utilization system fully utilizes the geographical advantage of the mine water produced in the underground, not only utilizes the mine water residual heat, but also reasonably utilizes the mine water resources originally discharged and wasted in the mine water sump. The low-temperature clean mine water after purification and heat extraction is directly pumped into the original working face spraying device, provides suitable spraying water for the dust removal and cooling of the working face, not only improves the environment of the tunneling working face, but also avoids the loss of transportation of spraying water from the ground to the underground.

[0043] 6、The system has simple structure, reasonable design and convenient realization, can be effectively applied in the mine residual heat resource gradient recovery, has good use effect, and is convenient to popularize and use.

[0044] In summary, the system of the present application has simple structure, reasonable design, and is easy to implement, and in combination with the application method, can be effectively applied in the cascade recovery of mine waste heat resources, realize the cascade recovery of mine waste heat resources, especially the multi-stage use of mine water resources, the process connection is appropriate, the implementation is convenient, the waste heat resource grade characteristics are reasonably utilized, the waste heat extraction, spraying cooling, filling backfill multiple work can be completed at the same time, the use effect is good, and the use is convenient.

[0045] The technical solutions of the present application will be further described in detail below by means of the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is the system principle diagram of the present application;

[0047] Figure 2 It is the structure diagram of the physical dredging device of the present application;

[0048] Figure 3 It is the structure diagram of the vibration mechanism of the present application;

[0049] Figure 4 It is the structure diagram of the fine filter screen of the present application.

[0050] BRIEF DESCRIPTION OF DRAWINGS

[0051] 1—mine water multi-stage utilization system; 1-1—mine water heat exchange pool; 1-2—heat exchange coil;

[0052] 1-3—physical dredging device; 1-3-1—purification tank; 1-3-2—sand and stone treatment bin;

[0053] 1-3-3—sand removing mechanism; 1-3-31—first gear; 1-3-32—second gear;

[0054] 1-3-33—third gear; 1-3-34—spring driving rod; 1-3-35—hinged rod;

[0055] 1-3-4—mine water inlet; 1-3-5—coarse filter screen; 1-3-6—steel bar;

[0056] 1-3-7—fine filter screen; 1-3-8—spring; 1-3-9—slide;

[0057] 1-3-10—first sand and stone filter screen; 1-3-11—second sand and stone filter screen; 1-3-12—vibration mechanism;

[0058] 1-3-121—connecting rod; 1-3-122—slide groove; 1-3-123—first vibration spring;

[0059] 1-3-124—Second vibration spring; 1-3-125—Vibration motor; 1-3-126—Counterweight;

[0060] 1-3-13—First crushing roller; 1-3-14—Second crushing roller; 1-3-15—Sand and gravel collection pool;

[0061] 1-3-16—Sand and gravel conveying pipeline; 1-3-17—Mulch pump; 1-3-18—First fixing component;

[0062] 1-3-19—Second fixing component; 1-4—Work face spraying device; 1-5—Chemical purification device;

[0063] 1-5-1—Chemical reagent box; 1-5-2—L-shaped rack; 1-5-3—Push plate;

[0064] 1-5-4—Push-button switch; 1-5-5—Nozzle; 1-5-6—Stirring rod;

[0065] 2—Refrigeration system; 2-1—Condenser; 2-2—Evaporator;

[0066] 2-3—First circulation pipe; 2-4—Second circulation pipe; 2-5—Circulation pump;

[0067] 2-6—Valves; 3—Heating system; 3-1—Heat pump unit;

[0068] 3-2—Heating user end; 3-3—Heating pipeline; 3-4—Circulating return water pipe;

[0069] 4—Plate heat exchanger; 5—Upstream piping; 6—Media pump;

[0070] 7—Downstream pipeline; 8—Mine water delivery pipeline; 9—Water pump. Detailed Implementation

[0071] like Figure 1 As shown, the mine waste heat resource cascade recovery system of the present invention includes a mine water multi-stage utilization system 1 and a refrigeration system 2 located in the mine, and a heating system 3 located on the surface of the mining area; the mine water multi-stage utilization system 1 includes a mine water heat exchange tank 1-1, a heat exchange coil 1-2 installed in the mine water heat exchange tank 1-1, a physical sludge removal device 1-3 installed at the water inlet end of the mine water heat exchange tank 1-1, a working face spray device 1-4 installed at the water outlet end of the mine water heat exchange tank 1-1, and a chemical purification device 1-5 installed on the side of the mine water heat exchange tank 1-1; a plate heat exchanger 4 is connected between the refrigeration system 2 and the heat exchange coil 1-2, and the heating system 3 is connected to both the heat exchange coil 1-2 and the plate heat exchanger 4.

[0072] In this embodiment, asFigure 2 and Figure 4 As shown, the physical dredging device 1-3 includes a purification box 1-3-1 installed on top of the mine water heat exchange tank 1-1, a sand and gravel treatment chamber 1-3-2 installed on one side of the mine water heat exchange tank 1-1, and a sand removal mechanism 1-3-3 installed on the other side of the mine water heat exchange tank 1-1; a mine water inlet 1-3-4 is provided on the top of the purification box 1-3-1; a coarse filter screen 1-3-5, a steel bar 1-3-6, and a fine filter screen 1-3-7 are arranged sequentially from top to bottom inside the purification box 1-3-1; a spring 1-3-8 is vertically arranged between the coarse filter screen 1-3-5 and the steel bar 1-3-6; and a slide rail 1-3-9 is provided on the fine filter screen 1-3-7; the sand and gravel treatment... The sand and gravel processing bin 1-3-2 is equipped with a first sand and gravel filter screen 1-3-10 and a second sand and gravel filter screen 1-3-11. A vibration mechanism 1-3-12 is connected between the first sand and gravel filter screen 1-3-10 and the second sand and gravel filter screen 1-3-11. A first crushing roller 1-3-13 is arranged above the first sand and gravel filter screen 1-3-10, and a second crushing roller 1-3-14 is arranged above the second sand and gravel filter screen 1-3-11. A sand and gravel collection pool 1-3-15 is arranged at the bottom of the sand and gravel processing bin 1-3-2. A sand and gravel conveying pipe 1-3-16 is connected to the side of the sand and gravel collection pool 1-3-15. A mud pump 1-3-17 is arranged on the sand and gravel conveying pipe 1-3-16.

[0073] In practice, the physical sludge removal device 1-3 is installed in the goaf of the mine roadway. The two ends of the steel bar 1-3-6 are fixed to the inner wall of the purification box 1-3-1. One end of the spring 1-3-8 is fixed to the center of the steel bar 1-3-6 via a fastener, and the other end of the spring 1-3-8 is connected to the center of the coarse filter screen 1-3-5 for support. The fine filter screen 1-3-7 is fixed to the bottom of the purification box 1-3-1 and covers the top of the mine water heat exchange tank 1-1. The bottom of the sand and gravel collection tank 1-3-15 has a slope ranging from 8° to 15°, with an optimal slope of 12°. A mine water delivery pipe 8 connects the mine water heat exchange tank 1-1 to the working face spraying device 1-4, and a water pump 9 is installed on the mine water delivery pipe 8.

[0074] In this embodiment, as Figure 2 As shown, the first sand and gravel filter screen 1-3-10 is inclined, and one end of the first sand and gravel filter screen 1-3-10 is fixed to the outer wall of the purification box 1-3-1 by the first fixing member 1-3-18. The second sand and gravel filter screen 1-3-11 is horizontally arranged, and one end of the second sand and gravel filter screen 1-3-11 is fixed to the inner wall of the sand and gravel treatment chamber 1-3-2 by the second fixing member 1-3-19.

[0075] In actual implementation, the mine water inlet 1-3-4 is arranged on one side close to the sand treatment bin 1-3-2. When the mine water with silt sand enters the purification tank 1-3-1 from the mine water inlet 1-3-4, the large-particle silt sand is retained on the coarse filter screen 1-3-5 under the action of gravity, and the small fine sand and coal powder are retained on the fine filter screen 1-3-7, and the mine water filtered by the double physical filtering enters the mine water heat exchange pool 1-1. The weight of the silt sand accumulated on the coarse filter screen 1-3-5 gradually increases, the spring 1-3-8 is deformed, the end of the coarse filter screen 1-3-5 close to the sand treatment bin 1-3-2 is inclined downward, the silt sand slides along the inclined coarse filter screen 1-3-5 into the sand treatment bin 1-3-2, and the silt sand is crushed into fine sand under the action of the first crushing roller 1-3-13, filtered through the first sand filter screen 1-3-10 in vibration, and enters the sand collecting pool 1-3-15. The unfiltered sand slides along the inclined first sand filter screen 1-3-10, is crushed again under the action of the second crushing roller 1-3-14, is filtered through the second sand filter screen 1-3-11 in vibration, and enters the sand collecting pool 1-3-15. The fine sand in the sand collecting pool 1-3-15 is conveyed to the mine filling area under the action of the slurry pump 1-3-17.

[0076] In the embodiment, as shown in Figure 3 The vibration mechanism 1-3-12 includes a connecting rod 1-3-121 and a chute 1-3-122 arranged at the middle position of the connecting rod 1-3-121. One end of the connecting rod 1-3-121 is connected to the other end of the first sand filter screen 1-3-10, and the other end of the connecting rod 1-3-121 is connected to the other end of the second sand filter screen 1-3-11. A first vibration spring 1-3-123 is sleeved on the connecting rod 1-3-121 close to the first sand filter screen 1-3-10, and a second vibration spring 1-3-124 is sleeved on the connecting rod 1-3-121 close to the second sand filter screen 1-3-11. A vibration motor 1-3-125 is arranged in the chute 1-3-122, and a counterweight 1-3-126 capable of sliding along the chute is connected to the output shaft of the vibration motor 1-3-125.

[0077] In the embodiment, when the vibration motor 1-3-125 is started, the counterweight 1-3-126 is driven to rotate in the sliding groove 1-3-122. When the counterweight 1-3-126 rotates to the upper side, the first vibration spring 1-3-123 is compressed, and the second vibration spring 1-3-124 is elongated. When the counterweight 1-3-126 rotates to the lower side, the first vibration spring 1-3-123 is elongated, and the second vibration spring 1-3-124 is compressed. In the compression and elongation changes of the first vibration spring 1-3-123 and the second vibration spring 1-3-124, the vibration motor 1-3-125 drives the sliding groove 1-3-122 and the connecting rod 1-3-121 to reciprocate up and down, thereby driving the first sand filter screen 1-3-10 and the second sand filter screen 1-3-11 to continuously vibrate. Fine sand is sieved on the filter screen under high-frequency vibration, thereby improving the sand filtering and filling speed.

[0078] In the embodiment, as shown in Figure 2 The sand removing mechanism 1-3-3 includes a first gear 1-3-31, a second gear 1-3-32, a third gear 1-3-33, a spring driving rod 1-3-34, and a hinged rod 1-3-35. The first gear 1-3-31 and the second gear 1-3-32 are engaged. The second gear 1-3-32 and the third gear 1-3-33 are coaxially connected. One end of the spring driving rod 1-3-34 is connected to the first gear 1-3-31 through the hinged rod 1-3-35. The other end of the spring driving rod 1-3-34 is connected to the coarse filter screen 1-3-5.

[0079] In the embodiment, as shown in Figure 2 The chemical purification device 1-5 includes a chemical reagent box 1-5-1, an L-shaped rack 1-5-2, and a push disc 1-5-3. The chemical reagent box 1-5-1 is arranged on the outer wall of the mine water heat exchange pool 1-1. A press switch 1-5-4 is arranged on the outer side of the chemical reagent box 1-5-1. A nozzle 1-5-5 is arranged in the chemical reagent box 1-5-1 and located in the mine water heat exchange pool 1-1. The chemical reagent box 1-5-1 stores chemical purification reagents. The L-shaped rack 1-5-2 is engaged with the third gear 1-3-33. The push disc 1-5-3 is located on the fine filter screen 1-3-7 and can slide along the slide 1-3-9. One end of the L-shaped rack 1-5-2 is connected to the push disc 1-5-3. The other end of the L-shaped rack 1-5-2 can approach and press the press switch 1-5-4 with the movement of the L-shaped rack 1-5-2. The bottom of the push disc 1-5-3 is connected to a stirring rod 1-5-6 located in the mine water heat exchange pool 1-1.

[0080] In actual implementation, when the coarse filter screen 1-3-5 in the purification box 1-3-1 is tilted, the spring driving rod 1-3-34 and the hinged rod 1-3-35 are pulled, the hinged rod 1-3-35 drives the first gear 1-3-31 to rotate, the first gear 1-3-31 drives the second gear 1-3-32 and the third gear 1-3-33 to rotate, the third gear 1-3-33 drives the L-shaped rack 1-5-2 to move, the L-shaped rack 1-5-2 pushes the push disc 1-5-3 to move towards the sandstone treatment bin 1-3-2, and the fine sand on the fine filter screen 1-3-7 and the coal powder are pushed into the sandstone treatment bin 1-3-2; at the same time, with the movement of the L-shaped rack 1-5-2, the extrusion pressing switch 1-5-4 is pressed, the nozzle 1-5-5 located in the mine water heat exchange pool 1-1 injects chemical purification reagent into the mine water, and the stirring rod 1-5-6 connected with the bottom of the push disc 1-5-3 moves in the mine water heat exchange pool 1-1 along with the push disc 1-5-3, so that the chemical purification reagent is stirred with the mine water, the chemical reaction speed of the chemical purification reagent with the metal ions in the mine water is accelerated, and the chemical purification is carried out while the mine water is heat-exchanged.

[0081] In the embodiment, as shown in Figure 1 The refrigeration system 2 includes a condenser 2-1 and an evaporator 2-2, a first circulating pipe 2-3 and a second circulating pipe 2-4 are connected between the condenser 2-1 and the evaporator 2-2, a circulating pump 2-5 is arranged on the first circulating pipe 2-3, and a valve 2-6 is arranged on the second circulating pipe 2-4; the plate heat exchanger 4 includes a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet, the hot fluid inlet and the hot fluid outlet are communicated with the condenser 2-1, the cold fluid inlet is communicated with the heat exchange coil 1-2, the cold fluid outlet is communicated with the heat supply system 3 through an upward pipe 5, and a medium pump 6 is arranged on the upward pipe 5.

[0082] In actual implementation, the refrigeration system 2 and the plate heat exchanger 4 are arranged in an underground refrigeration chamber.

[0083] In the embodiment, as shown in Figure 1 The heat supply system 3 includes a heat pump unit 3-1 and a heat supply user end 3-2, a heat supply pipe 3-3 and a circulating backwater pipe 3-4 are connected between the heat pump unit 3-1 and the heat supply user end 3-2, the heat pump unit 3-1 is communicated with the heat exchange coil 1-2 through a downward pipe 7, and the downward pipe 7 is filled with a heat exchange medium.

[0084] In actual implementation, the upward pipe 5 and the downward pipe 7 are respectively arranged in two mine tunnels, the upward pipe 5 is a heat preservation pipe, the heat exchange medium is a liquid with high specific heat capacity and low boiling point, including water and ethanol, and a single medium form or a double medium form is adopted.

[0085] The heat pump unit 3-1 extracts heat in order of energy grade from high to low, specifically, the heat exchange medium is filled in the downlink pipeline 7, the heat exchange medium flows through the heat exchange coil 1-2 in the mine water heat exchange pool 1-1, and first heat exchange is generated with the physically filtered mine water, the temperature of the heat exchange medium rises after extracting the waste heat of the mine water, then the heat exchange medium enters the plate heat exchanger 4 to extract heat in the second stage, the temperature of the heat exchange medium further rises after absorbing the heat emitted by the condenser 2-1, under the action of the medium pump 6, the heat exchange medium is transported to the heat pump unit 3-1 on the ground of the mine area through the uplink pipeline 5, the temperature of the heat exchange medium is cooled after heat supply and utilization of the heat pump unit 3-1 to the heat user end 3-2, and the heat exchange medium is recycled to the downlink pipeline 7, so that the cascade recovery of mine waste heat resources is realized.

[0086] The application method of the mine waste heat resource cascade recovery system provided by the application comprises the following steps:

[0087] Step A1, when the mine water with silt and gravel enters the purification box 1-3-1 from the mine water inlet 1-3-4, the large particles of silt and gravel are retained on the coarse filter screen 1-3-5 under the action of gravity, and the small fine sand and coal powder are retained on the fine filter screen 1-3-7 after fine filtering;

[0088] Step A2, the mine water filtered by the double physical filtering enters the mine water heat exchange pool 1-1 and still has most of the heat, the mine water and the heat exchange coil 1-2 filled with the heat exchange medium are in counterflow heat exchange, the temperature of the mine water is lowered, and the temperature of the heat exchange medium is raised;

[0089] Step A3, the weight of the silt and gravel accumulated on the coarse filter screen 1-3-5 gradually increases, the spring 1-3-8 is deformed, the end of the coarse filter screen 1-3-5 close to the gravel treatment bin 1-3-2 is inclined downward, and the silt and gravel slide into the gravel treatment bin 1-3-2 along the inclined coarse filter screen 1-3-5; at the same time, the coarse filter screen 1-3-5 pulls the spring driving rod 1-3-34 and the hinged rod 1-3-35, the hinged rod 1-3-35 drives the first gear 1-3-31 to rotate, the first gear 1-3-31 drives the second gear 1-3-32 and the third gear 1-3-33 to rotate, the third gear 1-3-33 drives the L-shaped rack 1-5-2 to move, and the L-shaped rack 1-5-2 drives the push disc 1-5-3 to move to the gravel treatment bin 1-3-2;

[0090] Step A4, the silt sand is crushed into fine sand by the first crushing roller 1-3-13, filtered through the first sand filter screen 1-3-10 in vibration, and enters the sand collecting pool 1-3-15, the unfiltered sand slides along the inclined first sand filter screen 1-3-10, is crushed again under the action of the second crushing roller 1-3-14, and is filtered through the second sand filter screen 1-3-11 in vibration, and enters the sand collecting pool 1-3-15; at the same time, the fine sand on the fine filter screen 1-3-7 and the coal powder are pushed to the sand treatment bin 1-3-2 by the push disc 1-5-3, and the fine sand in the sand collecting pool 1-3-15 is conveyed to the mine filling area under the action of the slurry pump 1-3-17, and automatic filling backfill work is carried out;

[0091] Step A5, with the movement of the L-shaped rack 1-5-2, the L-shaped rack 1-5-2 end extrudes the press switch 1-5-4, the nozzle 1-5-5 in the mine water heat exchange pool 1-1 injects chemical purification reagent into the mine water, and the stirring rod 1-5-6 connected with the bottom of the push disc 1-5-3 moves in the mine water heat exchange pool 1-1 with the push disc 1-5-3, so that the chemical purification reagent is stirred with the mine water, the chemical reaction speed of the chemical purification reagent and the metal ions in the mine water is accelerated, and the chemical purification is carried out while the mine water is heat exchanged;

[0092] Step A6, the low-temperature mine water after chemical purification and heat extraction is conveyed to the working face spraying device 1-4, dust and temperature of the working face are reduced, and the risk of nozzle blockage of the working face spraying device 1-4 is reduced.

[0093] The application also includes a method for determining the total heat exchange amount extracted by the mine waste heat resource cascade recovery system and the inlet flow of the heat exchange medium in the plate heat exchanger 4, and the specific process includes:

[0094] Step B1, determining the first heat exchange amount extracted by the heat exchange medium from the mine water heat exchange pool;

[0095] Q1=KlΔt m

[0096]

[0097]

[0098]

[0099]

[0100] In the formula, Q1 is the first heat extracted by the heat exchange medium from the mine water heat exchange pool, K is the heat exchange coefficient of the heat exchange coil per unit pipe length, L is the pipe length, Δt′ m is the logarithmic mean temperature difference of the mine water and the heat exchange medium, t w ​Q1 = h1 (t1 - t2) A1 L1 e1 Q1 = h1 (t1 - t2) A1 L1 e2 Q1 = h1 (t1 - t2) A1 L1 r1 Q1 = h1 (t1 - t2) A1 L1 r2 Q1 = h1 (t1 - t2) A1 L1 rw Q1 = h1 (t1 - t2) A1 L1

[0101] Step B2, determining the secondary heat exchange quantity extracted by the heat exchange medium from the condensation heat and the inlet flow of the heat exchange medium in the plate heat exchanger;

[0102] Q2 = c p ′V c ρ′(t c ′-t c ″)

[0103]

[0104] Q2 = c c ′V p ′V p ′V c ′V c ′V

[0105] Step B3, determining the total heat exchange quantity Q extracted by the mine waste heat resource cascade recovery system from the underground cascade, Q = Q1 + Q2.

[0106] The above is only the preferred embodiment of the present application, and does not limit the present application, and any simple modification, change and equivalent structure change according to the technical essence of the present application to the above embodiment are still within the protection scope of the technical solution of the present application.

Claims

1. A mine waste heat resource cascade recovery system, characterized in that: The application relates to a mine water multi-stage utilization system (1) and a refrigeration system (2) located in a mine, and a heating system (3) located on the ground of a mine area; the mine water multi-stage utilization system (1) comprises a mine water heat exchange pool (1-1), the mine water heat exchange pool (1-1) is provided with heat exchange coils (1-2), the water inlet end of the mine water heat exchange pool (1-1) is provided with a physical desilting device (1-3), the water outlet end of the mine water heat exchange pool (1-1) is provided with a working face spraying device (1-4), the side of the mine water heat exchange pool (1-1) is provided with a chemical purification device (1-5); the refrigeration system (2) is connected with the heat exchange coils (1-2) through a plate heat exchanger (4), and the heating system (3) is connected with the heat exchange coils (1-2) and the plate heat exchanger (4).

2. The mine residual heat resource cascade recovery system according to claim 1, characterized in that: The physical desilting device (1-3) comprises a purification box (1-3-1) arranged at the top of the mine water heat exchange pool (1-1), a sand and stone treatment bin (1-3-2) arranged at one side of the mine water heat exchange pool (1-1), and a sand removing mechanism (1-3-3) arranged at the other side of the mine water heat exchange pool (1-1); the top of the purification box (1-3-1) is provided with a mine water inlet (1-3-4), the purification box (1-3-1) is sequentially and spacedly provided with a coarse filter screen (1-3-5), a steel bar (1-3-6) and a fine filter screen (1-3-7) from top to bottom, a spring (1-3-8) is vertically arranged between the coarse filter screen (1-3-5) and the steel bar (1-3-6), and a slide (1-3-9) is arranged on the fine filter screen (1-3-7); the sand and stone treatment bin (1-3-2) is provided with a first sand and stone filter screen (1-3-10) and a second sand and stone filter screen (1-3-11), a vibration mechanism (1-3-12) is connected between the first sand and stone filter screen (1-3-10) and the second sand and stone filter screen (1-3-11), a first crushing roller (1-3-13) is arranged above the first sand and stone filter screen (1-3-10), a second crushing roller (1-3-14) is arranged above the second sand and stone filter screen (1-3-11), and a sand and stone collecting pool (1-3-15) is arranged at the bottom of the sand and stone treatment bin (1-3-2), a sand and stone conveying pipeline (1-3-16) is connected to the side of the sand and stone collecting pool (1-3-15), and a mud pump (1-3-17) is arranged on the sand and stone conveying pipeline (1-3-16).

3. The mine residual heat resource cascade recovery system according to claim 2, characterized in that: The first sand and stone filter screen (1-3-10) is arranged obliquely, one end of the first sand and stone filter screen (1-3-10) is fixed to the outer wall of the purification box (1-3-1) through a first fixing member (1-3-18), the second sand and stone filter screen (1-3-11) is arranged horizontally, and one end of the second sand and stone filter screen (1-3-11) is fixed to the inner wall of the sand and stone treatment bin (1-3-2) through a second fixing member (1-3-19).

4. The mine residual heat resource cascade recovery system according to claim 3, characterized in that: The vibration mechanism (1-3-12) comprises a connecting rod (1-3-121) and a sliding groove (1-3-122) arranged at the middle position of the connecting rod (1-3-121), one end of the connecting rod (1-3-121) is connected with the other end of the first sand filter screen (1-3-10), the other end of the connecting rod (1-3-121) is connected with the other end of the second sand filter screen (1-3-11), a first vibration spring (1-3-123) is sleeved on the connecting rod (1-3-121) close to the first sand filter screen (1-3-10), a second vibration spring (1-3-124) is sleeved on the connecting rod (1-3-121) close to the second sand filter screen (1-3-11), a vibration motor (1-3-125) is arranged in the sliding groove (1-3-122), and a counterweight (1-3-126) capable of sliding along the sliding groove is connected to the output shaft of the vibration motor (1-3-125).

5. The mine residual heat resource cascade recovery system according to claim 3, characterized in that: The sand removing mechanism (1-3-3) comprises a first gear (1-3-31), a second gear (1-3-32), a third gear (1-3-33), a spring driving rod (1-3-34) and a hinged rod (1-3-35), the first gear (1-3-31) and the second gear (1-3-32) are engaged, the second gear (1-3-32) and the third gear (1-3-33) are coaxially connected, one end of the spring driving rod (1-3-34) is connected to the first gear (1-3-31) through the hinged rod (1-3-35), and the other end of the spring driving rod (1-3-34) is connected with the coarse filter screen (1-3-5).

6. The mine residual heat resource cascade recovery system according to claim 5, characterized in that: The chemical purification device (1-5) comprises a chemical reagent box (1-5-1), an L-shaped rack (1-5-2) and a push disc (1-5-3), the chemical reagent box (1-5-1) is arranged on the outer wall of the mine water heat exchange pool (1-1), a press switch (1-5-4) is arranged on the outer side of the chemical reagent box (1-5-1), a nozzle (1-5-5) located in the mine water heat exchange pool (1-1) is arranged on the inner side of the chemical reagent box (1-5-1), and chemical purification reagents are stored in the chemical reagent box (1-5-1); the L-shaped rack (1-5-2) is engaged with the third gear (1-3-33), the push disc (1-5-3) is located on the fine filter screen (1-3-7) and can slide along the slide (1-3-9), one end of the L-shaped rack (1-5-2) is connected with the push disc (1-5-3), the other end of the L-shaped rack (1-5-2) can approach and press the press switch (1-5-4) along with the movement of the L-shaped rack (1-5-2), and the bottom of the push disc (1-5-3) is connected with a stirring rod (1-5-6) located in the mine water heat exchange pool (1-1).

7. The mine residual heat resource cascade recovery system according to claim 6, characterized in that: The refrigeration system (2) comprises a condenser (2-1) and an evaporator (2-2), a first circulating pipe (2-3) and a second circulating pipe (2-4) are connected between the condenser (2-1) and the evaporator (2-2), a circulating pump (2-5) is arranged on the first circulating pipe (2-3), a valve (2-6) is arranged on the second circulating pipe (2-4), the plate heat exchanger (4) comprises a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet, the hot fluid inlet and the hot fluid outlet are communicated with the condenser (2-1), the cold fluid inlet is communicated with the heat exchange coil (1-2), the cold fluid outlet is communicated with the heat supply system (3) through an upward pipeline (5), and a medium pump (6) is arranged on the upward pipeline (5).

8. The mine residual heat resource cascade recovery system according to claim 7, characterized in that: The heat supply system (3) comprises a heat pump unit (3-1) and a heat supply user end (3-2), a heat supply pipeline (3-3) and a circulating backwater pipe (3-4) are connected between the heat pump unit (3-1) and the heat supply user end (3-2), the heat pump unit (3-1) is communicated with the heat exchange coil (1-2) through a downward pipeline (7), and the downward pipeline (7) is filled with a heat exchange medium.

9. The application method of the mine waste heat resource cascade recovery system, characterized in that, The system of claim 8 is used, and the application method comprises the following steps: Step A1, when the mine water with silt and gravel enters the purification box (1-3-1) from the mine water inlet (1-3-4), the large particles of silt and gravel are retained on the coarse filter screen (1-3-5) under the action of gravity, and the small fine sand and coal powder are retained on the fine filter screen (1-3-7) after fine filtering; Step A2, the mine water filtered by the double physical filtering enters the mine water heat exchange pool (1-1) and still has most of the heat, the mine water and the heat exchange coil (1-2) filled with the heat exchange medium are in counterflow heat exchange, the temperature of the mine water is reduced, and the temperature of the heat exchange medium is increased; Step A3, the weight of the silt and gravel accumulated on the coarse filter screen (1-3-5) gradually increases, the spring (1-3-8) is deformed, one end of the coarse filter screen (1-3-5) close to the sand treatment bin (1-3-2) is inclined downward, and the silt and gravel slide into the sand treatment bin (1-3-2) along the inclined coarse filter screen (1-3-5); meanwhile, the coarse filter screen (1-3-5) pulls the spring driving rod (1-3-34) and the articulated rod (1-3-35), the articulated rod (1-3-35) drives the first gear (1-3-31) to rotate, the first gear (1-3-31) drives the second gear (1-3-32) and the third gear (1-3-33) to rotate, the third gear (1-3-33) drives the L-shaped rack (1-5-2) to move, and the L-shaped rack (1-5-2) drives the push disc (1-5-3) to move towards the sand treatment bin (1-3-2). Step A4, the silt sand is crushed into fine sand by the first crushing roller (1-3-13), filtered by the first sand filter screen (1-3-10) in vibration, and enters the sand collecting pool (1-3-15). The unfiltered sand slides along the inclined first sand filter screen (1-3-10), is crushed again by the second crushing roller (1-3-14), and is filtered by the second sand filter screen (1-3-11) in vibration, and enters the sand collecting pool (1-3-15). At the same time, the fine sand on the fine filter screen (1-3-7) and the coal powder are pushed to the sand treatment bin (1-3-2) by the push plate (1-5-3). The fine sand in the sand collecting pool (1-3-15) is transported to the mine filling area by the mud pump (1-3-17) for automatic filling and backfilling work. Step A5, as the L-shaped rack (1-5-2) moves, the L-shaped rack (1-5-2) end extrusion press switch (1-5-4), the nozzle (1-5-5) in the mine water heat exchange pool (1-1) injects chemical purification reagent into the mine water, and the stirring rod (1-5-6) connected with the push plate (1-5-3) moves in the mine water heat exchange pool (1-1) with the push plate (1-5-3), stirs the chemical purification reagent and the mine water, and speeds up the chemical reaction speed of the chemical purification reagent and the metal ions in the mine water. Chemical purification is carried out while the mine water is heat exchanged. Step A6, the low-temperature mine water after chemical purification and heat extraction is transported to the working face spraying device (1-4) to cool the working face and reduce the risk of nozzle blockage of the working face spraying device (1-4).

10. The application method of a mine waste heat resource cascade recovery system according to claim 9, characterized in that, The method also includes determining the total heat extraction amount of the mine waste heat resource cascade recovery system and the inlet flow of the heat exchange medium in the plate heat exchanger (4). The specific process includes: Step B1, determining the first heat extraction amount of the heat exchange medium from the mine water heat exchange pool; Q1 = K1Δt m ' In the formula, Q1 is the first heat extracted by the heat exchange medium from the mine water heat exchange pool, K is the heat exchange coefficient of the heat exchange coil per unit length, L is the length of the tube, △t' m is the logarithmic mean temperature difference of the mine water and the heat exchange medium, t w is the inlet water temperature of the mine water, t1 is the inlet temperature of the heat exchange medium in the mine water heat exchange pool, t2 is the outlet temperature of the heat exchange medium in the mine water heat exchange pool, h1 is the convective heat exchange coefficient of the heat exchange medium side in the heat exchange coil, h2 is the convective heat exchange coefficient of the mine water side outside the heat exchange coil, R e1 is the Reynolds number of the heat exchange medium, R e2 is the Reynolds number of the mine water, P r1 is the Prandtl number of the heat exchange medium, P r2 is the Prandtl number of the mine water, P rw is the Prandtl number of the outer wall of the heat exchange coil, d1 is the outer diameter of the heat exchange coil, d2 is the inner diameter of the heat exchange coil, λ1 is the thermal conductivity of the heat exchange medium, λ2 is the thermal conductivity of the mine water, and λ3 is the thermal conductivity of the tube wall. Step B2, determining the second heat extraction amount of the heat exchange medium from the condensation heat and the inlet flow of the heat exchange medium in the plate heat exchanger; Q2 = c p ′V c ρ′(t c ′-t c ″) wherein Q2 is the secondary heat exchange amount of the heat transfer medium extracted from the condensing heat recovery system, V c is the inlet flow rate of the hot fluid side of the plate heat exchanger, V is the inlet flow rate of the heat transfer medium in the plate heat exchanger, c' p is the specific heat capacity at constant pressure of the inlet medium of the hot fluid side of the plate heat exchanger, c p is the specific heat capacity at constant pressure of the heat transfer medium, p' is the density of the inlet medium of the hot fluid side of the plate heat exchanger, p is the density of the heat transfer medium, t' c is the inlet temperature of the hot fluid side of the plate heat exchanger, t" c is the outlet temperature of the hot fluid side of the plate heat exchanger, t2 is the inlet temperature of the heat transfer medium, t3 is the outlet temperature of the heat transfer medium; Step B3, determining the total heat extraction amount Q = Q1+Q2 of the mine waste heat resource cascade recovery system from the underground cascade.

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