Mine return air waste heat recycling system with defrosting function

Abstract

The invention relates to a mine return air waste heat recycling system with a defrosting function, which comprises an air inlet shaft, a return air diffusion tower, a ventilation duct, a heat exchange device and a defrosting system, the air inlet shaft and the return air diffusion tower are communicated with the outside through the ventilation duct and the heat exchange device; when passing through the heat exchange device, the air exhausted from the return air diffusion tower to the outside exchanges heat with the air entering the air inlet shaft from the outside at the heat exchange device; the heat exchange device can be defrosted through the defrosting system, so that the heat exchange efficiency is improved. Compared with the prior art, the mine return air waste heat recycling system with the defrosting function has at least one of the following advantages and positive effects that online defrosting can be achieved, the heat exchange plate, the heat pipe and the heat pipe cooling fins cannot be frosted when working at the low temperature below zero DEG C, heat in mine return air below zero DEG C can be recycled, and the heat exchange plate, the heat pipe and the heat pipe cooling fins are prevented from being frosted when working at the low temperature below zero DEG C; and the waste heat recovery amount and recovery efficiency of mine return air are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and particularly relates to a system for recovering and utilizing the waste heat of mine return air with a defrosting function. Background Art

[0002] Due to the high water vapor content and relative humidity in the mine return air, when the temperature of the mine return air approaches zero degree, frost and ice will condense in the evaporator, which will not only reduce the heat transfer rate of the evaporator, lower the recovery speed and efficiency of the mine return air waste heat recovery system, but also seriously damage the heat dissipation devices in the evaporator or even the entire waste heat recovery system in severe cases. Therefore, the current mine return air waste heat recovery and utilization devices only recover the heat above zero degree, and the heat of the mine return air close to or below zero degree cannot be recovered and utilized, seriously reducing the recovery amount and efficiency of the heat in the mine return air.

[0003] For this reason, the present application proposes a system for recovering and utilizing the waste heat of mine return air with a defrosting function to solve the above problems. Summary of the Invention

[0004] One main object of the present invention is to overcome at least one defect in the prior art, and provide a system for recovering and utilizing the waste heat of mine return air with a defrosting function, which is used to recover the heat below zero degree in the mine return air without frosting, and improves the recovery amount and recovery rate of the waste heat of the mine return air.

[0005] In order to achieve the above technical solution, the present invention adopts the following technical solutions: A system for recovering and utilizing the waste heat of mine return air with a defrosting function includes: an air inlet shaft, a return air diffusion tower, a ventilation duct, a heat exchange device, and a defrosting system. The air inlet shaft and the return air diffusion tower are both communicated with the outside through the ventilation duct and the heat exchange device. When the air discharged from the return air diffusion tower to the outside passes through the heat exchange device, it exchanges heat with the air entering the air inlet shaft from the outside at the heat exchange device. The defrosting system can defrost the heat exchange device to improve the heat exchange efficiency.

[0006] According to an embodiment of the present invention, the ventilation duct is a hollow air passage, and the periphery of the ventilation duct is made of heat-insulating and sealing materials, including but not limited to foam-insulated color steel plates, asbestos-insulated color steel plates, and polyurethane-insulated color steel plates.

[0007] According to an embodiment of the present invention, the heat exchange device is provided with a housing, and the housing of the heat exchange device is provided with a top plate, a bottom plate, a front wall plate, and a rear wall plate. The housing is made of heat-insulating and sealing materials, including but not limited to foam-insulated color steel plates, asbestos-insulated color steel plates, and polyurethane-insulated color steel plates.

[0008] According to an embodiment of the present invention, a number of heat exchange plates are provided in the heat exchange device. The heat exchange plates are arranged vertically and parallel to each other, and two adjacent heat exchange plates are separated by two sealing partitions.

[0009] According to an embodiment of the present invention, one of the two sealing partitions is arranged at the top of two adjacent heat exchange plates and is an upper sealing partition, and the other is arranged at the bottom of two adjacent heat exchange plates and is a lower sealing partition. The upper sealing partition and the lower sealing partition are supported and connected by a number of support columns.

[0010] According to an embodiment of the present invention, the support columns are arranged vertically. The support columns are used to support the distance between the upper sealing partition and the lower sealing partition and fix the positions of the sealing partitions. At the same time, a number of turbulent flow support plates are arranged at intervals on the support columns between the upper sealing partition and the lower sealing partition.

[0011] According to an embodiment of the present invention, the turbulent flow support plates are arranged in a zigzag shape between two adjacent heat exchange plates. The horizontal direction of the turbulent flow support plates is in contact with the surfaces of two adjacent heat exchange plates. While the turbulent flow support plates support the distance between two adjacent heat exchange plates and fix the positions of the heat exchange plates, they also conduct turbulent flow guidance on the flow state of the air between two adjacent heat exchange plates.

[0012] According to an embodiment of the present invention, the upper sealing partition and the lower sealing partition are respectively hermetically arranged with the heat exchange plates. The upper sealing partition, the lower sealing partition and two adjacent heat exchange plates form an air channel. The air channel discharged to the outside by the return air diffusion tower is a return air heat exchange channel, and the air channel entering the air intake shaft from the outside is an intake air heat exchange channel.

[0013] According to an embodiment of the present invention, a number of heat exchange plates, a number of upper sealing partitions and a number of lower sealing partitions form a plurality of return air heat exchange channels and intake air heat exchange channels. The plurality of return air heat exchange channels and intake air heat exchange channels are arranged in an alternating manner, that is, one side of each heat exchange plate is an intake air heat exchange channel and the other side is a return air heat exchange channel. Adjacent intake air heat exchange channels and return air heat exchange channels share one heat exchange plate.

[0014] According to an embodiment of the present invention, an intake air heat exchange channel air inlet guiding port, an intake air heat exchange channel air outlet guiding port, a return air heat exchange channel air inlet guiding port and a return air heat exchange channel air outlet guiding port are respectively arranged at both ends of the heat exchange device. The return air heat exchange channel air inlet guiding port is communicated with the return air diffusion tower through a ventilation duct to introduce the mine return air in the return air diffusion tower into the return air heat exchange channel. The return air heat exchange channel air outlet guiding port discharges the mine return air in the return air heat exchange channel into the outside atmosphere; the intake air heat exchange channel air inlet guiding port introduces the air in the outside atmosphere into the intake air heat exchange channel, and the intake air heat exchange channel air outlet guiding port discharges the mine intake air in the intake air heat exchange channel and introduces it into the air intake shaft of the mine through a ventilation duct; The flow direction of the mine intake air in the intake air heat exchange duct is opposite to that of the mine return air in the return air heat exchange duct. When the mine return air flows through the return air heat exchange duct, it transfers heat to the mine intake air in the two side intake air heat exchange ducts through the heat exchange plate, realizing the recovery and utilization of the waste heat of the mine return air.

[0015] According to an embodiment of the present invention, the intake air guiding opening of the return air heat exchange duct and the outlet air guiding opening of the intake air heat exchange duct are combined and arranged on one side of the heat exchange device, and the outlet air guiding opening of the return air heat exchange duct and the intake air guiding opening of the intake air heat exchange duct are combined and arranged on the other side of the heat exchange device.

[0016] According to an embodiment of the present invention, the heat exchange plate is made of a plate with fast heat conduction speed, small thermal resistance and corrosion resistance, and can be a stainless steel plate, a titanium alloy plate or a graphene plate.

[0017] According to an embodiment of the present invention, the defrosting system adopts a spray defrosting system or an electric heating defrosting system.

[0018] According to an embodiment of the present invention, the spray defrosting system includes a spray pump, a spray pipe, a spray head, a heating tank and a liquid storage tank. A working liquid is placed in the liquid storage tank. The inlet of the spray pump is communicated with the liquid storage tank, and the outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is installed at the top inside the return air heat exchange duct, and the spray pipe is arranged in sections. Each section of the spray pipe is independently controlled by a valve to realize independent liquid supply and independent spraying. Correspondingly, a number of spray heads are installed on each section of the spray pipe. The spray heads spray the working liquid conveyed by the spray pump onto the heat exchange plate to melt the frost on the heat exchange plate. The defrosted working liquid is discharged through the drainage holes on the bottom plate of the return air heat exchange duct and is collected by the drainage pipe and flows into the heating tank.

[0019] According to an embodiment of the present invention, the spray defrosting system includes a spray pump, a spray pipe, a mist spray head, a collection pool, a liquid storage tank and a heating tank. A working liquid is placed in the heating tank. The inlet of the spray pump is communicated with the heating tank, and the outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is installed at the top inside the outlet air guiding opening of the intake air heat exchange duct perpendicular to the air flow direction. At least one spray pipe is provided. A number of mist spray heads are provided on the spray pipe. A collection pool is provided below the spray pipe. A drainage hole is provided below the collection pool to penetrate the bottom plate of the heat exchange device. The collection pool is used to collect the working liquid sprayed by the spray heads of the spray pipe. The collection pool discharges the collected working liquid through the drainage hole and flows into the liquid storage tank.

[0020] According to an embodiment of the present invention, the liquid storage tank is located below the heat exchange device.

[0021] According to an embodiment of the present invention, the heating tank is located below the heat exchange device.

[0022] According to an embodiment of the present invention, the heating method of the heating box is any one of electric heating, gas heating, and steam heating.

[0023] According to an embodiment of the present invention, the working fluid is a refrigerant or an antifreeze, and the refrigerant is preferably calcium chloride brine.

[0024] According to an embodiment of the present invention, the electric heating defrosting system includes a power supply, a controller, a display screen, an electric heater, and a temperature sensor. The temperature sensors are respectively installed in the inlet air heat exchange duct and the return air heat exchange duct. The electric heater is fixed on the heat exchange plate. The temperature sensor, the electric heater, and the display screen are respectively electrically connected to the controller. The display screen is used to display the temperatures in the inlet air heat exchange duct and the return air heat exchange duct. The power supply supplies power to the controller, the display screen, the electric heater, and the temperature sensor through cables.

[0025] According to an embodiment of the present invention, the electric heater is in a strip shape, and a plurality of electric heaters are provided on each heat exchange plate, and the adjacent electric heaters are arranged parallel to each other.

[0026] According to an embodiment of the present invention, the controller is respectively electrically connected to the spray pump, the atomizing pump, and the heating box to realize the transmission of control signals.

[0027] The controller of the present invention is used to control the on-off states of the electric heater, the spray pump, the atomizing pump, and the heating box.

[0028] A mine return air waste heat recovery and utilization system with a defrosting function includes: an intake shaft, a return air diffusion tower, a ventilation duct, a heat exchange device, and a defrosting system. The intake shaft and the return air diffusion tower are both connected to the outside through the heat exchange device. When the air discharged from the return air diffusion tower to the outside passes through the heat exchange device, heat exchange is realized with the air entering the intake shaft from the outside at the heat exchange device; the defrosting system can defrost the heat exchange device to improve the heat exchange efficiency; The air passage for the air discharged from the return air diffusion tower to the outside is the return air heat exchange duct, and the air passage for the air entering the intake shaft from the outside is the inlet air heat exchange duct. The heat exchange device is a heat pipe. The upper half of the heat pipe is located in the inlet air heat exchange duct, and the lower half of the heat pipe is located in the return air heat exchange duct. The lower half of the heat pipe "transports" the heat carried by the mine return air in the return air heat exchange duct to the inlet air heat exchange duct. When the outside air enters the intake shaft through the inlet air heat exchange duct, the heat is recovered and utilized.

[0029] According to an embodiment of the present invention, the defrosting system includes a spray pump, a spray pipe, a spray head, a mist pump, a mist pipe, a mist nozzle, a liquid storage tank, and a heating tank. A working liquid is placed in the liquid storage tank. The inlet of the spray pump is communicated with the liquid storage tank, and the outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is arranged in the return air heat exchange duct, and each spray pipe is provided with a spray head. The spray head can spray the working liquid in the liquid storage tank onto the lower half of the heat pipe in the return air heat exchange duct to melt the frost on the heat pipe. The defrosted working liquid is discharged through the drain hole on the bottom plate of the return air heat exchange duct and is collected by the drain pipe and flows into the heating tank. The working liquid in the heating tank is heated and then pumped and pressurized by the mist pump and conveyed through a pipeline to the mist nozzle in the air outlet guiding port of the fresh air heat exchange duct, and is sprayed onto the fresh air entering the mine through the mist nozzle. When the fresh air entering the mine absorbs the heat of the working liquid, it also absorbs the moisture in the working liquid. The working liquid with reduced moisture drops into the collection pool arranged at the bottom and flows into the liquid storage tank through the drain hole and the drain pipe for recycling.

[0030] According to an embodiment of the present invention, a plurality of heat pipe heat dissipation fins are provided on the heat pipe to improve the heat exchange efficiency.

[0031] From the above technical solutions, it can be seen that the present invention has at least one of the following advantages and positive effects: The mine return air waste heat recovery and utilization system with a defrosting function according to the present invention can achieve online defrosting, enable the heat exchange plate, heat pipe, and heat pipe heat dissipation fins not to frost when operating at a low temperature below zero degrees, can recover the heat in the mine return air below zero degrees, and improve the waste heat recovery amount and recovery efficiency of the mine return air. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a schematic structural diagram of an embodiment of the mine return air waste heat recovery and utilization system with a defrosting function according to the present invention; Figure 2 For Figure 1 The top view of the heat exchange device in Figure 3 For Figure 2 The cross-sectional view of the heat exchange device in Figure 4 It is a schematic structural diagram of the defrosting system of the return air heat exchange duct of the present invention; Figure 5 For Figure 4Front schematic view of the defrosting system for the middle return air heat exchange duct, where the double arrows indicate the return air flow direction; Figure 6 Structural schematic diagram of the defrosting using the heat pipe heat exchange device in the present invention; Figure 7 Structural schematic diagram of the spray structure of the air inlet heat exchange duct in the present invention; Figure 8 Circuit connection diagram of the controller, power supply, display screen, electric heater, and temperature sensor in the present invention; Figure 9 Structural schematic diagram of the electric heating defrosting method in the present invention.

[0034] Explanation of reference numerals: 1 - air inlet shaft, 2 - return air diffusion tower, 3 - ventilation duct, 4 - heat exchange device, 401 - top plate, 402 - bottom plate, 403 - front wall panel, 404 - rear wall panel, 405 - heat exchange plate, 406 - upper sealing partition, 407 - lower sealing partition, 408 - support column, 409 - turbulent flow support plate, 410 - air inlet heat exchange duct, 411 - return air heat exchange duct, 412 - air inlet guiding port of the air inlet heat exchange duct, 413 - air outlet guiding port of the return air heat exchange duct, 414 - air outlet guiding port of the air inlet heat exchange duct, 415 - air inlet guiding port of the return air heat exchange duct, 501 - spray pump, 502 - spray pipe, 503 - spray head, 504 - atomizing pump, 505 - atomizing pipe, 506 - collection pool, 508 - liquid storage tank, 509 - heating tank, 510 - pipeline, 511 - drain hole, 512 - fog spray head, 513 - valve, 514 - drain pipe, 515 - working fluid, 516 - heat pipe, 517 - heat pipe heat dissipation fin, 601 - power supply, 602 - controller, 603 - display screen, 604 - electric heater, 605 - temperature sensor. Detailed implementation manners

[0035] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more. The orientation or state relationship indicated by terms such as "inside", "upper", "lower", etc. is based on the orientation or state relationship shown in the drawings, and is 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 should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of the present invention described herein.

[0038] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0039] Refer to the attached Figures 1 to 9 , a mine return air waste heat recovery and utilization system with a defrosting function according to the present invention includes: an intake shaft 1, a return air diffusion tower 2, a ventilation duct 3, a heat exchange device 4, and a defrosting system. The intake shaft 1 and the return air diffusion tower 2 are both connected to the outside through the ventilation duct 3 and the heat exchange device 4. When the air discharged from the return air diffusion tower 2 passes through the heat exchange device 4, heat exchange is realized with the air entering the intake shaft 1 from the outside at the heat exchange device 4; at the same time, the defrosting system can defrost the heat exchange device 4 to improve the heat exchange efficiency. Among them, the ventilation duct 3 is a hollow air passage, and the periphery of the ventilation duct 3 is made of heat-insulating and sealing materials, including but not limited to foam-insulated color steel plates, asbestos-insulated color steel plates, and polyurethane-insulated color steel plates.

[0040] Such as Figure 3As shown, the heat exchange device 4 is provided with a housing. The housing of the heat exchange device 4 is provided with a top plate 401, a bottom plate 402, a front wall plate 403, and a rear wall plate 404. The housing is made of heat-insulating and sealing materials, including but not limited to foam-insulated color steel plates, asbestos-insulated color steel plates, and polyurethane-insulated color steel plates. Further, a number of heat exchange plates 405 are provided inside the heat exchange device 4. The heat exchange plates 405 are arranged vertically and parallel to each other, and are separated by two sealing partitions between adjacent two heat exchange plates 405. Specifically, one of the two sealing partitions is arranged at the top of adjacent two heat exchange plates 405 and is the upper sealing partition 406, and the other is arranged at the bottom of adjacent two heat exchange plates 405 and is the lower sealing partition 407. The upper sealing partition 406 and the lower sealing partition 407 are supported and connected by a number of support columns 408. Among them, the support columns 208 are arranged vertically. The support columns 208 are used to support the distance between the upper sealing partition 406 and the lower sealing partition 407 and fix the positions of the sealing partitions. At the same time, a number of turbulence support plates 409 are arranged at intervals on the support columns 408 between the upper sealing partition 406 and the lower sealing partition 407. Further, the turbulence support plates 409 are arranged in a "zigzag" shape between adjacent two heat exchange plates 405. The horizontal direction of the turbulence support plates 409 is in contact with the surfaces of adjacent two heat exchange plates 405. While the turbulence support plates 409 support the distance between adjacent two heat exchange plates 405 and fix the positions of the heat exchange plates 405, they also conduct turbulence guidance on the flow state of the air between adjacent two heat exchange plates 405. The turbulence support plates 409 can disrupt the flow directions of the mine intake air and the mine return air, which is beneficial to prolonging their flow time in the heat exchange device 4, and thus improving the heat exchange efficiency.

[0041] Among them, the upper sealing partition 406 and the lower sealing partition 407 are respectively sealed with the heat exchange plates 405. The upper sealing partition 406, the lower sealing partition 407 and adjacent two heat exchange plates 405 form an air channel. The air channel discharged to the outside by the return air diffusion tower 2 is the return air heat exchange channel 411, and the air channel entering the intake shaft from the outside is the intake air heat exchange channel 410. Further, a number of heat exchange plates 405, a number of upper sealing partitions 406, and a number of lower sealing partitions 407 form a plurality of return air heat exchange channels 411 and intake air heat exchange channels 410. The plurality of return air heat exchange channels 411 and intake air heat exchange channels 410 are arranged in an alternating manner, that is, one side of each heat exchange plate 405 is the intake air heat exchange channel 410, and the other side is the return air heat exchange channel 411. Adjacent intake air heat exchange channels 410 and return air heat exchange channels 411 share one heat exchange plate 405. In this embodiment, a total of three intake air heat exchange channels 410 and three return air heat exchange channels 411 are provided.

[0042] As Figure 1 、 2As shown in the figure, air inlet heat exchange duct air inlet guiding openings 411, air inlet heat exchange duct air outlet guiding openings 414, return air heat exchange duct air inlet guiding openings 415, and return air heat exchange duct air outlet guiding openings 413 are respectively provided at both ends of the heat exchange device 4. The return air heat exchange duct air inlet guiding opening 415 is communicated with the return air diffuser tower 2 through the ventilation duct 3, guiding the mine return air in the return air diffuser tower 2 into the return air heat exchange duct 411, and the return air heat exchange duct air outlet guiding opening 413 discharges the mine return air in the return air heat exchange duct 411 into the external atmosphere; the air inlet heat exchange duct air inlet guiding opening 412 guides the air in the external atmosphere into the air inlet heat exchange duct 410, and the air inlet heat exchange duct air outlet guiding opening 414 discharges the mine inlet air of the air inlet heat exchange duct 410 and guides it into the mine air inlet shaft 1 through the ventilation duct 3.

[0043] Among them, the flow direction of the mine inlet air in the air inlet heat exchange duct 410 is opposite to that of the mine return air in the return air heat exchange duct 411. When the mine return air flows through the return air heat exchange duct 411, it transfers heat to the mine inlet air in the air inlet heat exchange ducts 410 on both sides through the heat exchange plate 405, realizing the recovery and utilization of the waste heat of the mine return air. Further, the return air heat exchange duct air inlet guiding opening 415 and the air inlet heat exchange duct air outlet guiding opening 414 are combined and arranged on the right side of the heat exchange device 4, and the return air heat exchange duct air outlet guiding opening 413 and the air inlet heat exchange duct air inlet guiding opening 412 are combined and arranged on the left side of the heat exchange device 4. Furthermore, the heat exchange plate 405 is made of a plate with fast heat conduction speed, small thermal resistance, and corrosion resistance, which can be a stainless steel plate, a titanium alloy plate, or a graphene plate.

[0044] The defrosting system of the present invention can adopt a spray defrosting system or an electric heating defrosting system. The spray defrosting system and the electric heating defrosting system will be described below.

[0045] As Figure 4 、 5 shown, it is Embodiment 1 of the spray defrosting system of the present invention, including a spray pump 501, a spray pipe 502, a spray head 503, a heating box 509, and a liquid storage tank 508. A working fluid 515 is placed in the liquid storage tank 508. The inlet of the spray pump 501 is communicated with the liquid storage tank 508, and the outlet of the spray pump 501 is communicated with the spray pipe 502 through a pipeline 510. The spray pipe 502 is installed at the top inside the return air heat exchange duct 411. The spray pipe 502 is arranged in sections, and each section of the spray pipe 502 is independently controlled by a valve 513 to achieve independent liquid supply and independent spraying; correspondingly, a spray head 503 is installed on each section of the spray pipe 502. The spray head 503 sprays the working fluid conveyed by the spray pump 501 onto the heat exchange plate 405 to melt the frost on the heat exchange plate 405. The defrosted working fluid is discharged through the drain hole 511 on the bottom plate 402 of the return air heat exchange duct 411 and is collected by the drain pipe 514 and flows into the heating box 509.

[0046] AsFigure 7 As shown, it is the second implementation mode of the spray defrosting system, including a spray pump 504, a spray pipe 505, a mist nozzle 512, a collection pool 506, a liquid storage tank 508, and a heating tank 509. A working fluid 515 is placed in the heating tank 509. The inlet of the spray pump 504 is communicated with the heating tank 509, and the outlet of the spray pump 509 is communicated with the spray pipe 505 through a pipeline 510. The spray pipe 505 is installed at the inner top of the air outlet guiding port 414 of the air inlet heat exchange duct perpendicular to the air flow direction. At least one spray pipe 505 is provided, and a number of mist nozzles 512 are provided on the spray pipe 505. A collection pool 506 is arranged below the spray pipe 505. A drain hole 511 is provided below the collection pool 506 to penetrate through the bottom plate 402 of the heat exchange device 4. The collection pool 506 is used to collect the working fluid 515 sprayed by the nozzles 512 of the spray pipe 505. The collected working fluid 515 is discharged through the drain hole 511 and flows into the liquid storage tank 508. Among them, the liquid storage tank 508 is located below the heat exchange device 4, and the heating tank 508 is located below the heat exchange device 4. The heating method of the heating tank 508 is any one of electric heating, gas heating, and steam heating. Those skilled in the art can select the heating method according to the actual situation.

[0047] In the present invention, the working fluid 515 is a refrigerant or an antifreeze, and the refrigerant is preferably calcium chloride brine. Further, the working fluid 515 is selected as calcium chloride brine. As is well known, calcium chloride brine has a small viscosity, a large specific heat, and a low freezing point. It is a liquid at -30°C and has an outstanding effect during the defrosting and deicing process.

[0048] See Figure 8 、 9 As shown, it is a schematic diagram of the electric heating defrosting system. The electric heating defrosting system includes a power supply 601, a controller 602, a display screen 603, an electric heater 604, and a temperature sensor 605. The temperature sensor 605 is respectively installed in the air inlet heat exchange duct 410 and the air return heat exchange duct 411. The electric heater 604 is fixed on the heat exchange plate 604. The temperature sensor 605, the electric heater 604, and the display screen 603 are respectively electrically connected to the controller 602. The display screen 603 is used to display the temperatures in the air inlet heat exchange duct 410 and the air return heat exchange duct 411. The power supply 601 supplies power to the controller 602, the display screen 603, the electric heater 604, and the temperature sensor 605 through cables respectively. Among them, the electric heater 604 is in a strip shape, and a number of electric heaters 604 are provided on each heat exchange plate 405, and the adjacent electric heaters 604 are arranged parallel to each other. The controller 602 is respectively electrically connected to the spray pump 501, the spray pump 504, and the heating tank 509 to realize the transmission of control signals. The controller 602 of the present invention is used to control the on-off states of the electric heater 604, the spray pump 501, the spray pump 504, and the heating tank 509.

[0049] As Figure 6 shown, another embodiment of a mine return air waste heat recovery and utilization system with a defrosting function according to the present invention. The system includes: an intake shaft 1, a return air diffusion tower 2, a ventilation duct 3, a heat exchange device 4, and a defrosting system. Both the intake shaft 1 and the return air diffusion tower 2 are communicated with the outside through the heat exchange device 4. When the air discharged from the return air diffusion tower 2 to the outside passes through the heat exchange device 4, heat exchange is realized with the air entering the intake shaft 1 from the outside at the heat exchange device 4. The heat exchange device 4 can be defrosted by the defrosting system to improve the heat exchange efficiency.

[0050] Among them, the air passage for the air discharged from the return air diffusion tower 2 to the outside is the return air heat exchange duct 411, and the air passage for the air entering the intake shaft 1 from the outside is the intake air heat exchange duct 410. The heat exchange device 4 is a heat pipe 516. The upper half of the heat pipe 516 is located in the intake air heat exchange duct 410, and the lower half of the heat pipe 516 is located in the return air heat exchange duct 411. The lower half of the heat pipe 516 "transports" the heat carried by the mine return air in the return air heat exchange duct 411 to the intake air heat exchange duct 410. When the outside air enters the intake shaft through the intake air heat exchange duct 410, the heat is recovered and utilized.

[0051] Among them, the defrosting system includes a spray pump 501, a spray pipe 502, a spray head 503, a mist spray pump 504, a mist spray pipe 505, a mist nozzle 512, a liquid storage tank 508, and a heating tank 509. A working fluid 515 is placed in the liquid storage tank 508. The inlet of the spray pump 501 is communicated with the liquid storage tank 508, and the outlet of the spray pump 501 is communicated with the spray pipe 502 through a pipeline 510. The spray pipe 502 is arranged in the return air heat exchange duct 411, and each spray pipe 502 is provided with a spray head 503. The spray head 503 can spray the working fluid 515 in the liquid storage tank 508 onto the lower half of the heat pipe in the return air heat exchange duct 411 to melt the frost on the heat pipe 516. The defrosted working fluid 515 is discharged through the drain hole 511 on the bottom plate of the return air heat exchange duct 411 and is collected by the drain pipe 514 and flows into the heating tank 509. The working fluid 515 in the heating tank 509 is heated and then pumped by the mist spray pump 504, pressurized, and then transported through the pipeline 510 to the mist nozzle 512 in the air outlet guiding port 414 of the intake air heat exchange duct and sprayed into the mine intake air by the mist nozzle 512. When the mine intake air absorbs the heat of the working fluid 515, it also absorbs the moisture in the working fluid 515. The working fluid 515 with reduced moisture falls into the collection pool 506 arranged at the bottom and flows into the liquid storage tank 508 through the drain hole 511 and the drain pipe 514 for recycling. Further, a plurality of heat pipe heat dissipation fins 517 are provided on the heat pipe 516 to improve the heat exchange efficiency. In this embodiment, the heat pipe 516 relies on the vapor-liquid phase change of the working fluid to transfer heat, and the thermal resistance is very small, so it has a very high heat conduction ability, which is the prior art.

[0052] In summary, the mine return air waste heat recovery and utilization system with a defrosting function according to the present invention can achieve online defrosting, enabling the heat exchange plates, heat pipes, and heat pipe heat dissipation fins to operate without frosting at low temperatures below zero degrees Celsius, and can recover the heat in the mine return air below zero degrees Celsius, improving the waste heat recovery amount and recovery efficiency of the mine return air.

[0053] It should be understood that the present invention does not limit its application to the detailed structures and arrangements of the components presented herein. The present invention is capable of having other embodiments and can be implemented and executed in various ways. The foregoing variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined herein extends to all alternative combinations of two or more separate features mentioned or apparent in the text and / or the drawings. The embodiments described herein illustrate the best mode known for implementing the present invention and will enable those skilled in the art to utilize the present invention.

Claims

1. A mine return air waste heat recovery and utilization system with a defrosting function, characterized in that, Including: An air inlet shaft, a return air diffusion tower, a ventilation duct, a heat exchange device, and a defrosting system. The air inlet shaft and the return air diffusion tower are both communicated with the outside through the ventilation duct and the heat exchange device. When the air discharged from the return air diffusion tower to the outside passes through the heat exchange device, heat exchange is realized with the air entering the air inlet shaft from the outside at the heat exchange device. The defrosting system can defrost the heat exchange device to improve the heat exchange efficiency.

2. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 1, characterized in that, The heat exchange device is provided with a housing, and the housing of the heat exchange device is provided with a top plate, a bottom plate, a front wall plate, and a rear wall plate.

3. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 1 or 2, characterized in that, A number of heat exchange plates are arranged in the heat exchange device. The heat exchange plates are arranged vertically and parallel to each other, and two adjacent heat exchange plates are separated by two sealing partitions.

4. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 3, characterized in that, One of the two sealing partitions is arranged at the top of two adjacent heat exchange plates and is an upper sealing partition, and the other is arranged at the bottom of two adjacent heat exchange plates and is a lower sealing partition. The upper sealing partition and the lower sealing partition are supported and connected by a number of support columns.

5. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 4, characterized in that, The support columns are arranged vertically. The support columns are used to support the distance between the upper sealing partition and the lower sealing partition and fix the positions of the sealing partitions. At the same time, a number of turbulence support plates are arranged at intervals on the support columns between the upper sealing partition and the lower sealing partition.

6. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 5, characterized in that, The turbulence support plates are arranged in a "zigzag" shape between two adjacent heat exchange plates. The horizontal direction of the turbulence support plates is in contact with the surfaces of two adjacent heat exchange plates. The turbulence support plates not only support the distance between two adjacent heat exchange plates and fix the positions of the heat exchange plates, but also conduct turbulence guidance on the flow state of the air between two adjacent heat exchange plates.

7. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 4 or 5, characterized in that The upper sealing partition and the lower sealing partition are respectively hermetically arranged with the heat exchange plates. The upper sealing partition, the lower sealing partition and two adjacent heat exchange plates form an air channel. The air channel for the air discharged from the return air diffusion tower to the outside is a return air heat exchange channel, and the air channel for the air entering the air inlet shaft from the outside is an air inlet heat exchange channel.

8. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 7, characterized in that, A number of heat exchange plates, a number of upper sealing partitions and a number of lower sealing partitions form a plurality of return air heat exchange channels and air inlet heat exchange channels. The plurality of return air heat exchange channels and air inlet heat exchange channels are arranged in an interval manner, that is, one side of each heat exchange plate is an air inlet heat exchange channel and the other side is a return air heat exchange channel. Adjacent air inlet heat exchange channels and return air heat exchange channels share one heat exchange plate.

9. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 1, characterized in that, The two ends of the heat exchange device are respectively provided with an air inlet heat exchange channel air inlet guiding port, an air inlet heat exchange channel air outlet guiding port, a return air heat exchange channel air inlet guiding port, and a return air heat exchange channel air outlet guiding port. The return air heat exchange channel air inlet guiding port is communicated with the return air diffusion tower through the ventilation duct to introduce the mine return air in the return air diffusion tower into the return air heat exchange channel. The return air heat exchange channel air outlet guiding port discharges the mine return air in the return air heat exchange channel into the outside atmosphere. The air inlet heat exchange channel air inlet guiding port introduces the air in the outside atmosphere into the air inlet heat exchange channel. The air inlet heat exchange channel air outlet guiding port discharges the mine inlet air in the air inlet heat exchange channel and introduces it into the air inlet shaft of the mine through the ventilation duct. The flow direction of the mine inlet air in the air inlet heat exchange channel is opposite to the flow direction of the mine return air in the return air heat exchange channel. When the mine return air flows through the return air heat exchange channel, the heat is transferred to the mine inlet air in the two side air inlet heat exchange channels through the heat exchange plates, realizing the recovery and utilization of the waste heat of the mine return air.

10. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 9, characterized in that, The air inlet guiding opening of the return air heat exchange channel and the air outlet guiding opening of the inlet air heat exchange channel are combined and arranged on one side of the heat exchange device, and the air outlet guiding opening of the return air heat exchange channel and the air inlet guiding opening of the inlet air heat exchange channel are combined and arranged on the other side of the heat exchange device.

11. The mine return air waste heat recovery and utilization system with a defrosting function according to claim 1, characterized in that, The defrosting system adopts a spray defrosting system or an electric heating defrosting system.

12. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 11, characterized in that, The spray defrosting system includes a spray pump, a spray pipe, spray nozzles, a heating tank, and a liquid storage tank. A working liquid is placed in the liquid storage tank. The liquid inlet of the spray pump is communicated with the liquid storage tank, and the liquid outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is installed at the top inside the return air heat exchange channel. The spray pipe is arranged in sections, and each section of the spray pipe is independently controlled by a valve to achieve independent liquid supply and independent spraying. Correspondingly, a number of spray nozzles are installed on each section of the spray pipe. The spray nozzles spray the working liquid conveyed by the spray pump onto the heat exchange plate to melt the frost on the heat exchange plate. The defrosted working liquid is discharged through the drain holes on the bottom plate of the return air heat exchange channel and is collected by the drain pipe and flows into the heating tank.

13. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 11, characterized in that, The spray defrosting system includes a spray pump, a spray pipe, mist nozzles, a collection pool, a liquid storage tank, and a heating tank. A working liquid is placed in the heating tank. The liquid inlet of the spray pump is communicated with the heating tank, and the liquid outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is installed perpendicular to the air flow direction at the top inside the air outlet guiding opening of the inlet air heat exchange channel. At least one spray pipe is provided. A number of mist nozzles are provided on the spray pipe. A collection pool is provided below the spray pipe. A drain hole is provided below the collection pool and passes through the bottom plate of the heat exchange device. The collection pool is used to collect the working liquid sprayed by the nozzles of the spray pipe. The collection pool discharges the collected working liquid through the drain hole and flows into the liquid storage tank.

14. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 12 or 13, characterized in that, The heating method of the heating tank is any one of electric heating, gas heating, and steam heating.

15. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 12 or 13, characterized in that, The working liquid is a freezing liquid or an antifreeze liquid, and the freezing liquid is preferably calcium chloride brine.

16. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 11, characterized in that, The electric heating defrosting system includes a power supply, a controller, a display screen, an electric heater, and a temperature sensor. The temperature sensors are respectively installed inside the inlet air heat exchange channel and the return air heat exchange channel. The electric heater is fixed on the heat exchange plate. The temperature sensor, the electric heater, and the display screen are respectively electrically connected to the controller. The display screen is used to display the temperatures inside the inlet air heat exchange channel and the return air heat exchange channel. The power supply supplies power to the controller, the display screen, the electric heater, and the temperature sensor through cables.

17. A mine return air waste heat recovery and utilization system with a defrosting function, characterized in that, Including: An inlet air shaft, a return air diffusion tower, a ventilation duct, a heat exchange device, and a defrosting system. The inlet air shaft and the return air diffusion tower are both communicated with the outside through the heat exchange device. When the air discharged from the return air diffusion tower to the outside passes through the heat exchange device, heat exchange is realized with the air entering the inlet air shaft from the outside at the heat exchange device. The defrosting system can defrost the heat exchange device to improve the heat exchange efficiency. The air channel for the air discharged from the return air diffusion tower to the outside is the return air heat exchange channel, and the air channel for the air entering the inlet air shaft from the outside is the inlet air heat exchange channel. The heat exchange device is a heat pipe. The upper half of the heat pipe is located inside the inlet air heat exchange channel, and the lower half of the heat pipe is located inside the return air heat exchange channel. The lower half of the heat pipe "transports" the heat carried by the mine return air inside the return air heat exchange channel to the inlet air heat exchange channel. When the outside air enters the inlet air shaft through the inlet air heat exchange channel, the heat is recycled.

18. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 17, characterized in that, The defrosting system includes a spray pump, a spray pipe, a spray head, a spray pump, a spray pipe, a mist spray head, a liquid storage tank, and a heating tank. A working liquid is placed in the liquid storage tank. The inlet of the spray pump is communicated with the liquid storage tank, and the outlet of the spray pump is communicated with the spray pipe through a pipeline. The spray pipe is arranged in the return air heat exchange duct, and each spray pipe is provided with a spray head. The spray head can spray the working liquid in the liquid storage tank onto the lower half of the heat pipe in the return air heat exchange duct to melt the frost on the heat pipe. The defrosted working liquid is discharged through the drain hole on the bottom plate of the return air heat exchange duct and is collected by the drain pipe and flows into the heating tank. The working liquid in the heating tank is heated and then pumped and pressurized by the spray pump and is transported through a pipeline to the mist spray head in the air outlet guiding port of the fresh air heat exchange duct and is sprayed onto the mine fresh air by the mist spray head. The mine fresh air absorbs the heat of the working liquid and also absorbs the moisture in the working liquid. The working liquid with reduced moisture drops into the collection pool arranged at the bottom and flows into the liquid storage tank through the drain hole and the drain pipe for recycling.

19. A mine return air waste heat recovery and utilization system with a defrosting function according to claim 18, characterized in that, A number of heat pipe heat dissipation fins are provided on the heat pipe.

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