A deep mine ventilation and refrigeration system using return air

Abstract

The present invention provides a deep mine ventilation and refrigeration system using return air, characterized in that it includes an air shaft, a return air cooling tower, a refrigeration unit, and a mine air cooler. Fresh air is input into the mine from the air shaft, and then the return air is heat exchanged through the return air cooling tower. The hot water cooled in the air cooling tower is heat exchanged with the evaporation end of the refrigeration unit. The refrigerant of the refrigeration unit is cooled and heat exchanged with the hot water from the mine air cooler. The hot water from the air cooler is cooled and enters the mine air cooler. The air entering the mine air cooler is cooled, and the cooled air is transported to the mine, thereby achieving the effect of cooling the mine environment. The present invention uses the return air system to provide cooling capacity instead of the water cooling tower system, avoiding the problems of water supply difficulties and water pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling of deep metal mines, and specifically designs a ventilation and cooling system for deep metal mines using return air, which can effectively reduce the ambient temperature under the mine, reduce the high-pressure heat exchange equipment of the refrigeration system above the mine, and improve the safety and stability of the system. Background Art

[0002] During deep-mine mining, the problem of underground thermal environment deterioration is very prominent. As the depth of the mine increases, the working face of the mine begins to be affected by high temperature after entering the deep part, which not only restricts the safe production and construction of the mine, but also threatens the health of the miners. my country's "Safety Regulations for Metal and Non-metal Mines" stipulates that the air temperature of the mining face of the production mine shall not exceed 26°C, and the air temperature of the electromechanical equipment chamber shall not exceed 30°C. When the air temperature of the above two working locations exceeds 30°C and 34°C, the operation must be stopped. At the same time, due to the needs of the process, a large amount of mine wastewater with stable temperature will be generated during the mining process. Taking a gold mine as an example, the existing deep-well operation area (depth>500m) is mainly based on ventilation cooling, the underground temperature is high (29°C), the relative humidity is high (>96%), the cooling effect is poor, and the thermal environment is very bad. In order to ensure the safe production of the mine and the health of the workers, effective measures must be taken to reduce the ambient temperature and control high temperature heat damage.

[0003] The deep well cooling technologies adopted at home and abroad include: arranging ventilation systems, workers' cooling suits, adding refrigerators above and below the well, etc. The existing problems are: the ventilation system becomes less effective as the depth of the operation increases; the cost of workers' cooling suits is high, and the operation process is not convenient; underground refrigerators have difficulty in heat removal, and using air as the heat dissipation medium leads to poor cooling effect and high operating costs.

[0004] Using fluid to induce vibration of heat transfer elements to achieve enhanced heat transfer is a form of passive heat transfer enhancement. It can transform the strict prevention of fluid vibration induction in the heat exchanger into effective use of vibration, greatly improve the convective heat transfer coefficient of the transmission element at low flow rate, and use vibration to suppress dirt on the surface of the heat transfer element, reduce dirt thermal resistance, and achieve composite enhanced heat transfer.

[0005] Heat exchangers and related technologies have made encouraging progress after rapid development in recent decades, but some long-standing unresolved problems have become more prominent. Fluid-induced vibration and scaling on the heat transfer surface in heat exchangers are recognized worldwide as prominent problems that need to be solved urgently. Fluid-induced vibration can cause severe noise and damage to the heat transfer tube bundle, and scaling on the heat transfer tube bundle surface can cause huge energy and resource losses. It is impossible to completely prevent tube bundle vibration in a heat exchanger, and increasing the strength of the heat transfer tube bundle to prevent vibration and avoid damage and noise to the tube bundle is not always effective. Using fluid-induced vibration of the heat transfer tube bundle to achieve enhanced heat exchange is a form of passive enhanced heat exchange. Through the effective use of vibration, it can achieve enhanced heat exchange while suppressing scaling on the heat transfer surface, reducing fouling thermal resistance, and achieving composite enhanced heat exchange.

[0006] The mining of metal mineral resources in my country has shifted to deep mines. With the continuous increase in mining depth and the improvement of the degree of mechanization of mining, heat damage in mines has become increasingly serious, which will have a serious impact on safe and efficient production and become a major scientific and technological problem that needs to be solved urgently in the metal mining industry. The high temperature and high humidity working environment underground will make people feel uncomfortable, thereby reducing labor productivity, increasing the accident rate, and affecting the safe production of mines. When people engage in heavy physical labor under high temperature conditions, if the cooling capacity of the surrounding environment is not enough to absorb the heat emitted by the human body, the thermal balance between the heat production and heat dissipation of the human body will be destroyed, causing adverse physiological and psychological reactions in the human body. Excessive heat environment can cause the body's temperature regulation function to be disordered.

[0007] Deep well heat damage is a key issue in deep mining, which restricts the deep mining capacity of metal mines. In terms of underground heat damage control, ventilation technology is the preferred technology for heat damage prevention and control because of its wide range of effects and low operation and maintenance costs. At the same time, with the increase in the mining depth of mines below one kilometer, the cooling capacity of the ventilation system will approach the limit, and ventilation and cooling can no longer solve the heat damage problem faced by deep mining, so it is necessary to develop refrigeration and ventilation technology. However, the mine is deep and the underground heat exchange environment is complex. The central air-conditioning system has high investment costs and is inflexible. It cannot respond quickly to the complex working conditions of the mine. The water supply pipeline of the water cooling tower system is long and has a large pressure difference. It is difficult to supply water in deep mines. In addition, the groundwater is often of poor quality. It is easy to cause blockage and pollution of the cooling device during the cooling process using cooling water, which is not convenient for maintenance and shortens the service life of the equipment. Therefore, the traditional refrigeration system can no longer meet the production needs of mines.

[0008] Therefore, the present invention aims at the deficiencies of the existing deep well underground centralized refrigeration system, provides a new mining circulating refrigeration system, and makes certain improvements on the original system, which is very suitable for deep well operations. Summary of the invention

[0009] In view of this, the technical problems to be solved by the present invention are: 1) the water supply difficulties and water pollution problems existing in the cooling method of the traditional water cooling tower; 2) the problem that the traditional cooling method has long pipelines and the pipelines have to withstand excessive pressure; 3) the traditional central air-conditioning technology has high investment costs, complicated pipelines, and is not flexible enough in the face of complex and changeable mining environment.

[0010] The present invention is achieved through the following technical solutions:

[0011] A ventilation and cooling system for a deep metal mine using return air is characterized in that it includes an air shaft, a return air cooling tower, a refrigeration unit, and a mine air cooler. Fresh air is input into the mine through the air shaft, and then the return air passes through the return air cooling tower for heat exchange. The hot water cooled in the air cooling tower is heat exchanged with the condensing end of the refrigeration unit. The refrigerant at the condensing end of the refrigeration unit is cooled and then heat exchanged with the hot water from the mine air cooler. The hot water from the air cooler is cooled, and then the hot water from the air cooler enters the mine air cooler. The air entering the mine air cooler is cooled, and the cooled air is transported to the mine, thereby achieving the effect of cooling the mine environment.

[0012] Preferably, the return air cooling tower is located at the upper part of the refrigeration unit, the mining field air cooler is located at the lower part of the refrigeration unit, and the mining field is located at the lower part of the mining field air cooler.

[0013] Preferably, the fluid flow between the refrigeration unit and the mine air cooler is driven by a variable frequency pump, and the air volume required in each mine is first sent to each mine air cooler by a variable frequency fan for cooling, and then transported to each mine by a ventilation hose.

[0014] Preferably, a water tank is included, which is arranged between the refrigeration unit and the mine air cooler. The refrigeration unit cools the hot water sent by the mine air cooler. The water cooled in the refrigeration unit is collected in the water tank, and the cold energy is stored in the water tank.

[0015] Preferably, the air coming out of the mine air cooler enters the air distributor, and the air coming out of the air distributor is divided into multiple paths and enters different positions of the mine respectively. The air channel distributor includes a horizontal box body, one end of the horizontal box body is an air inlet, and the other end is an air outlet, and there are multiple air outlets; a guide plate is arranged inside the horizontal box body, and the guide plate is a straight plate, which is set in two pieces. The two guide plates extend from the two side walls of the horizontal box body in the left and right directions to the air flow direction inside the horizontal box body, and the two guide plates are staggered inside the horizontal box body.

[0016] Preferably, the acute angle between the guide plate and the side wall is θ, the length of the guide plate is S, the distance between the lowest end points of the two guide plates and the air inlet of the air outlet is H; the distance between the two side walls is L;

[0017] (S*cosθ) / H=a*((S*sinθ) / L) 2 -b*((S*sinθ) / L)+c, where cosθ and sinθ are the cosine and sine functions of the angle θ, and a, b, c are parameters, where 9.915 <a<9.920,6.149<b<6.153,1.075<c<1.085。

[0018] The beneficial effects of the present invention are:

[0019] 1. The return air system is used to provide cooling instead of the water cooling tower system, avoiding the problems of water supply difficulties and water pollution.

[0020] 2. There is a large height difference between the air-cooling tower and the refrigeration unit. When the cooling water from the air-cooling tower is transported to the refrigeration unit, the pressure is relatively high. In order to avoid damage to the refrigeration unit caused by this high-pressure water, an intermediate heat exchanger is used to separate the high-pressure water and the refrigeration unit to ensure the safety of the refrigeration unit.

[0021] 3. The return air is located underground, which shortens the pipe length and height difference of the system and reduces the overall pressure of the system.

[0022] 4. The mine air cooler is placed in the mine tunnel close to the mine. Each group of mine air coolers and fans provides cooling for a mine separately, and the pipeline between the mine air cooler and the mine is relatively short. The purpose is to refine the pipeline. When the mine changes, the air cooler, fan and pipeline corresponding to the mine can be quickly disassembled and reinstalled. In the face of the complex internal environment of the mine, as the mining mine changes, the equipment in the mine that no longer needs refrigeration can be quickly transferred to the newly excavated mine, thereby improving the flexibility of the system.

[0023] 5. For the high-pressure working environment in deep mines, by adding a transition water supply tank, the originally low-pressure supplementary water is pressurized to the same pressure as the cooling circuit, and then the pressurized supplementary water is sent to the cooling water circuit. This invention can not only meet the water supply demand, but also prevent the water pump from directly sending normal pressure water into a high-pressure environment, reducing the power consumption of the pump, increasing the service life of the pump, reducing the accident rate, and improving the stability of the system.

[0024] 6. The present invention provides a new air distributor, which achieves uniform air temperature at the distributor outlet by arranging a plurality of relatively arranged guide plates in the air distributor, thereby meeting further cooling needs and improving product service life.

[0025] 7. The present invention optimizes the guide plate structure of the air distributor to achieve the best outlet air temperature uniformity effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the inventive structural schematic diagram of the system;

[0027] Figure 2 A schematic diagram of the structure of an air channel distributor of the background technology;

[0028] Figure 3 This is a schematic diagram of the structure of the air channel distributor of the present application;

[0029] Figure 4 A front view of the air channel distributor of the present application;

[0030] Figure 5 A parameter diagram of the air channel distributor of the present application;

[0031] Figure 6 It is a high and low pressure water replenishment device for the cooling system of deep mines.

[0032] In the figure: 1 is the return air cooling tower, 2 is the intermediate heat exchanger, 3 is the refrigeration unit, 4 is the water tank, 5 and 6 are variable frequency pumps, 7 to 12 are variable frequency fans, 13 to 18 are the mining field air coolers, and 19 to 24 are the mining field. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings.

[0034] Figure 1 A ventilation and cooling system for deep metal mines using return air is demonstrated. Figure 1 As shown, the system includes an air shaft, a return air cooling tower 1, a refrigeration unit 3, and a mining field air cooler 13-18. Fresh air is input into the mine through the air shaft, and then the return air passes through the return air cooling tower 1 for heat exchange. The return air cools the hot water in the return air cooling tower 1, and the cooled hot water directly or indirectly exchanges heat with the refrigerant from the refrigeration unit 3. After the refrigerant in the refrigeration unit 3 is cooled, it exchanges heat with the hot water from the mining field air cooler 13-18, and the hot water from the air cooler is cooled. After the hot water from the air cooler is cooled, it enters the mining field air cooler 13-18, and the air entering the mining field air cooler is cooled. The cooled air is transported to the mining field, thereby achieving the effect of cooling the mining field environment.

[0035] The present invention uses a return air system to provide cooling capacity in a metal mine instead of a water cooling tower system, thereby avoiding the problems of water supply difficulties and water pollution.

[0036] Preferably, the system also includes an intermediate heat exchanger 2, and the cooled hot water enters the intermediate heat exchanger 2, and performs heat exchange with the refrigerant from the refrigeration unit 3 in the intermediate heat exchanger 2, so as to cool the refrigerant flowing into the intermediate heat exchanger 2 from the refrigeration unit 3, and then the refrigerant in the refrigeration unit 3 is cooled and then performs heat exchange with the hot water from the mine air cooler 13-18.

[0037] The height difference between the air cooling tower and the refrigeration unit is large. When the cooling water from the air cooling tower is transported to the refrigeration unit, the pressure is high. In order to prevent the high-pressure water from damaging the refrigeration unit, an intermediate heat exchanger is used to separate the high-pressure water from the refrigeration unit, thereby ensuring the safety of the refrigeration unit. The present invention uses an intermediate heat exchanger to separate the high-pressure water from the refrigeration unit, thereby ensuring the safety of the refrigeration unit.

[0038] Preferably, the cold water flowing out of the return air cooling tower is transported to the intermediate heat exchanger by a variable frequency pump to cool the refrigerant flowing from the refrigeration unit to the intermediate heat exchanger. The present invention uses an intermediate heat exchanger to separate the high-pressure water from the refrigeration unit, thereby ensuring the safety of the refrigeration unit.

[0039] Alternatively, the refrigeration unit includes an evaporator, a condenser, a compressor and a throttle valve.

[0040] Preferably, the refrigerant is water.

[0041] Preferably, the return air cooling tower 1 is located below the ground and above the refrigeration unit and the intermediate heat exchanger, the inlet and outlet of the air shaft are located on the ground, and the return air duct is located below the ground. The field air cooler is located below the upper part of the refrigeration unit and the intermediate heat exchanger, and the field is located below the field air cooler. The return air position of the present invention is located underground, which shortens the pipeline length and height difference of the system, and reduces the overall pressure of the system.

[0042] As a preferred embodiment, each group of mine air coolers and fans provides cooling for a mine alone. The mine air coolers are placed in the mine tunnels close to the mines. Each group of mine air coolers and fans provides cooling for a mine alone. The pipelines between the mine air coolers and the mines are relatively short. The purpose is to refine the pipelines. When the mines change, the air coolers, fans and pipelines corresponding to the mines can be quickly disassembled and reinstalled. In the face of the complex internal environment of the mine, it can be realized that as the mining mines change, the equipment in the mines that no longer need refrigeration can be quickly transferred to the newly excavated mines, thereby improving the flexibility of the system.

[0043] Preferably, the fluid flow between the refrigeration unit 3 and the mine air cooler is driven by a variable frequency pump, and the air volume required in each mine is first sent to each mine air cooler by the variable frequency fan for cooling, and then transported to each mine by a ventilation hose.

[0044] Furthermore, the hot water in the water tank is sent to the mine air cooler at the depth C under the action of the variable frequency pump, and the air is transported to the mine air cooler under the action of the variable frequency fan. The cold energy is transferred to the air in the mine air cooler and transported to the mine that needs cooling and cooling through the hose, thereby achieving the effect of lowering the mine temperature.

[0045] Preferably, the system includes a water tank 4, which is arranged between the refrigeration unit and the field air cooler. The refrigeration unit cools the hot water sent by the field air cooler. The water cooled in the refrigeration unit is collected in the water tank, and the cold energy is stored in the water tank. Fresh air is input into the mine from the air shaft, and plays the role of ventilation, dust removal and slight temperature reduction in the mine. According to the mine environment, a return air cooling tower is set at a suitable depth to extract the cold energy in the return air. The return air is heat exchanged in the return air cooling tower. The cold and hot fluids of the return air cooling tower are arranged in a cross flow. At this time, the cold energy contained in the wind is exchanged to the air cooling tower. In the air cooling tower, the hot water flowing from the heat exchanger to the air cooling tower is cooled, and then the water is transported to the intermediate heat exchanger through the variable frequency pump. The intermediate heat exchanger cools the hot water flowing into the intermediate heat exchanger from the refrigeration unit. Under the action of the variable frequency pump, this water is sent to the refrigeration unit, and the cold capacity is transferred to the refrigeration unit through this water. In the refrigeration unit, the hot water sent up by the air cooler in the mining area is cooled, and the cold water is stored in the water tank. Under the action of the variable frequency pump, the cold water in the water tank is sent to the underground. The mine air coolers are arranged in parallel, and the frequency conversion fan supplies air volume to each mine air cooler. Each mine air cooler then supplies cooling to the corresponding mine. The cold and hot fluids in the mine air coolers are arranged in a cross flow. The cold water exchanges heat with the hot air flowing through the mine air coolers, and the cold air is transferred to the hot air flowing through the mine air coolers. After obtaining the cold air, the hot air becomes cold air. The cold air is transported to the mine that needs to be cooled through the hose, thereby achieving the effect of cooling the mine environment.

[0046] As a preferred embodiment, the present invention further studies and improves the intelligent control function of the ventilation and cooling system. Figure 1 The ventilation and cooling system can realize multi-faceted and all-round intelligent control.

[0047] As an improvement, the air shaft outlet includes a return air fan, a pump is arranged between the intermediate heat exchanger and the refrigeration unit, a temperature sensor is arranged at the air shaft outlet, the temperature sensor and the return air fan are data connected with the controller, and the controller automatically controls the power of the pump according to the measured return air temperature T at the air shaft outlet and the return air fan frequency P.

[0048] Preferably, when the detected temperature T decreases, the controller controls the pump to increase power, and when the detected temperature T increases, the controller controls the pump to decrease power.

[0049] Preferably, when the detected return fan frequency P decreases, the controller controls the pump power to decrease, and when the detected return fan frequency P increases, the controller controls the pump power to increase.

[0050] Preferably, when (tT)*P decreases, the controller controls the pump power to decrease, and when the detected (tT)*P increases, the controller controls the pump power to decrease, wherein t is a set temperature, preferably 20-25 degrees Celsius.

[0051] The present invention achieves compatibility of the return air temperature and the return air power with the operation of the water pump through further intelligent control.

[0052] like Figure 2 As shown, an air duct is arranged between the mine air cooler and the mine, an air distributor 38 is arranged between the air duct and the mine air outlet, and the air distributor is provided with a plurality of outlets corresponding to different positions of the mine.

[0053] During operation, the air coming out of the air cooler in the mining area enters the air distributor 38, and the air coming out of the air distributor 38 is divided into multiple paths and enters different positions in the mining area respectively.

[0054] like Figure 2 , 3 As shown, the air channel distributor 38 includes a horizontal box 381, one end of the horizontal box 381 is an air inlet, and the other end is an air outlet. There are multiple air outlets, corresponding to different positions of the mining field. Figure 2 As shown, due to the uneven heat exchange problem, the air temperature at different locations in the air channel is different, resulting in uneven air temperature distribution in multiple air outlets connected to the rear of the air distributor. Figure 2 The three air outlet temperatures are not uniform, with the maximum difference between the highest and lowest temperatures being 7-8 degrees Celsius.

[0055] The present invention further improves the air distributor. As an improvement, Figure 3 As shown, a guide plate 81 is provided inside the horizontal box 381. The guide plate is a straight plate, and is provided in two pieces. The two guide plates extend from the two side walls in the left and right directions of the horizontal box 381 toward the air flow direction inside the horizontal box 381. The two guide plates 81 are staggered inside the horizontal box 381. Figure 4 and Figure 5 As shown, one guide plate is arranged on the upper side or lower side of the left side wall, and the other is arranged on the lower side or upper side of the right side wall corresponding to the left side wall row, thereby achieving a staggered arrangement.

[0056] The present invention provides two guide plates so that part of the air entering the distributor is guided to the opposite direction along the guide plates and fully mixed with the air entering from the opposite direction, thereby achieving uniform air temperature and avoiding problems caused by uneven outlet air.

[0057] Preferably, the connection width of each guide plate at the side wall is 50% of the height W of the side wall.

[0058] Through the above-mentioned size design, on the one hand, as many guide plates as possible can be distributed in the space to achieve sufficient uniformity of temperature, and on the other hand, short circuits in air flow can be avoided to prevent air from flowing out in one direction, so that air mixing can achieve the optimal structure.

[0059] Preferably, the position where the guide plate is connected to the side wall is arranged near the inlet of the air distributor. By being arranged near the inlet of the air distributor, the internal space of the air distributor is large enough to ensure sufficient mixing.

[0060] Preferably, the horizontal portion 381 is a rectangular cross-section.

[0061] Preferably, the guide plate is a straight plate.

[0062] The acute angle between the guide plate 81 and the side wall is θ, the length of the guide plate is S, the distance between the lowest end points of the two guide plates 81 and the air inlet of the air outlet is H; the distance between the two side walls is L.

[0063] Through a large number of numerical simulations and experimental studies, it is found that the arrangement of the guide plate 81 should comprehensively consider diversion, mixing, resistance, vibration, etc. The angle θ should not be too large, otherwise the static pressure and dynamic pressure on the surface of the guide plate are high, the flow resistance increases, and it should not be too small, which will lead to poor temperature equalization effect. The spare section h should not be too large, which will cause the structure to be too long and increase the cost. It should not be too small, which will cause the mixed gas to be unable to be fully mixed, and otherwise the local flow velocity near the outlet will be too high, which is not conducive to uniform temperature and flow. The length of the guide plate needs to be changed according to the change of the angle. Otherwise, the guide plate will be too long when the angle is too large, which will increase a lot of resistance. When the angle is too small, the guide plate will be too short and the mixing effect will be very poor. Therefore, this application determines the optimal structural optimization relationship through numerical simulation and experimental research.

[0064] (S*cosθ) / H=a*((S*sinθ) / L) 2 -b*((S*sinθ) / L)+c, where cosθ and sinθ are the cosine and sine functions of the angle θ, and a, b, c are parameters, where 9.915 <a<9.920,6.149<b<6.153,1.075<c<1.085。

[0065] Further preferably, a=9.9175, b=6.151, c=1.080.

[0066] Preferably, 2.11>S*cosθ / H>0.1, 0.25 <S*sinθ / L<0.75,20°<θ<70°。

[0067] Preferably, as the angle θ increases, the length S of the guide plate decreases continuously.

[0068] Preferably, as L increases, H increases continuously.

[0069] Preferably, as the angle θ decreases, H increases continuously.

[0070] To prevent vibration of the guide plate, preferably, the thickness of the guide plate should not be less than 2 mm.

[0071] As a preference, 40 <S<50mm,180<h <200mm,70<L<80mm,22<w<27mm。

[0072] Through the design of the guide plate, the temperature of the air in the air channel distributor can achieve the best temperature uniformity effect while meeting the heat exchange requirements.

[0073] As an improvement, the present invention further discloses a high-low pressure water replenishment device for a deep mine field cooling system. Figure 6 As shown, the high and low pressure water replenishment system used in deep mines provided by the present invention includes a normal pressure water replenishment tank, a filtering and purifying device, a low pressure end flow control valve, a low pressure water pump, a water pressure early warning system, a pressure sensor, a transition water replenishment tank, a water level monitoring system, a liquid pressurizing device, a high pressure end flow control valve, and a high pressure water pump. The normal pressure water replenishment tank and the transition water replenishment tank are connected by a pipeline, and a filtering and purifying device, a low pressure flow control valve and a low pressure water pump are sequentially arranged between the normal pressure water replenishment tank and the transition water replenishment pipeline. The low pressure flow control valve is connected to the low pressure water pump, and the transition water replenishment tank is connected to the high pressure water pump through a pipeline, and a high pressure flow control valve and a high pressure water pump are sequentially arranged in the middle of the pipeline connecting the transition water replenishment tank and the high pressure water pump. The high pressure water pump is connected to the mine cooling circuit.

[0074] The water replenishment device also includes a low-pressure water flow control system, a low-pressure water pump control system, a transition water replenishment tank water level monitoring system, a liquid pressurizing system, a pressure control system, a high-pressure water flow control system, and a high-pressure water pump control system. The low-pressure water flow control system is used to control the flow of cooling water between the normal-pressure replenishment tank and the transition water replenishment tank; the low-pressure water pump control system is used to send the cooling water in the normal-pressure replenishment tank to the transition water replenishment tank; the transition water replenishment tank water level monitoring system is used to monitor the water level changes in the replenishment tank to prevent the water level in the replenishment tank from being too high; the liquid pressurizing system is used to pressurize the cooling water in the transition tank to the same working pressure as the mine cooling circuit; the pressure control system is used to monitor the changes in the water pressure in the transition water tank to prevent the water pressure from being too high and causing accidents; the high-pressure water flow control system is used to regulate the flow of cooling water between the transition water tank and the cooling circuit; the high-pressure water pump control system is used to send the pressurized cooling water in the transition water tank to the cooling circuit.

[0075] When starting work, the low-pressure flow valve is opened and the high-pressure flow valve is closed. The low-pressure cooling water enters the transition water supply tank from the normal pressure water supply tank through the water pump. Then the low-pressure flow control valve is closed. The low-pressure cooling water is pressurized by the pressurizing device in the transition water supply tank to the same pressure as the mine refrigeration system circuit. Then the high-pressure flow control valve is opened and the pressurized cooling water is sent to the mine cooling system through the high-pressure water pump.

[0076] When starting work, the high-pressure flow control valve is closed, the high-pressure pump is turned off, and the make-up water passes through the water pump and is sent to the pipeline from the make-up water tank. The impurities in the make-up water are first removed by the filter and water purification device to improve the quality of the make-up water. Then the low-pressure flow control valve is opened, and the purified make-up water is sent to the transition make-up water tank by the low-pressure water pump.

[0077] A water level monitoring system is installed at the transition water supply tank. When the water level in the transition water supply tank reaches the standard water level, the system sends a signal to the control cabinet. At this time, the low-pressure flow valve is closed, the low-pressure water pump is turned off, and the liquid pressurizing device is started at the same time.

[0078] As a further improvement of the above embodiment, the water level monitoring system also includes an alarm function. When the water level in the transition water supply tank exceeds the critical water level, the water level monitoring system sends an alarm to the control cabinet, forcibly stops the water inlet, and opens the drain valve to improve system stability.

[0079] As a further improvement of the above embodiment, the transition water tank also includes a drain valve.

[0080] The transition water tank is provided with a pressure sensor which can monitor the change of pressure in the transition water tank. When the pressure in the transition water tank reaches the requirement, the pressurizing device stops pressurizing.

[0081] As a further improvement of the above embodiment, the pressure sensor is connected to the refrigeration circuit pressure system to sense the pressure changes in the cooling circuit in real time and feed the information back to the control console. The control console matches the pressure in real time to ensure that the pressure in the transition water tank meets the pressure requirements.

[0082] When the pressure in the transition water tank is too high, the pressure warning device will send an alarm to the control cabinet, and the transition water tank will urgently release pressure to prevent accidents caused by excessive pressure.

[0083] As a further improvement of the above embodiment, the water replenishment tank also includes a safety valve to improve system stability.

[0084] After the pressurization is completed, the high-pressure flow control valve opens, and the high-pressure water pump turns on to send the pressurized make-up water into the cooling circuit.

[0085] Preferably, the low-pressure water flow control system, the low-pressure water pump control system, the transition water tank water level monitoring system, the liquid pressurization system, the pressure control system, the high-pressure water flow control system, and the high-pressure water pump control system;

[0086] The low-pressure water flow control system is used to control the flow of cooling water between the normal-pressure water supply tank and the transition water supply tank;

[0087] The low-pressure water pump control system is used to deliver cooling water in the normal-pressure water supply tank to the transition water supply tank;

[0088] The transition water tank water level monitoring system is used to monitor the water level changes in the water tank to prevent the water level in the water tank from being too high;

[0089] The liquid pressurizing system is used to pressurize the cooling water in the transition box to the same working pressure as the mine cooling circuit;

[0090] The pressure control system is used to monitor the change of water pressure in the transition water tank to prevent the water pressure from being too high and causing accidents;

[0091] The high-pressure water flow control system is used to regulate the flow of cooling water between the transition water tank and the cooling circuit;

[0092] The high-pressure water pump control system is used to deliver the pressurized cooling water in the transition water tank to the cooling circuit.

[0093] Preferably, the low-pressure water flow control system further comprises a cooling water purification and filtering device, which is disposed between the water supply tank and the low-pressure water pump and is used for filtering impurities in the cooling water.

[0094] Preferably, a coordinated control system is also included between the low-pressure water pump and the low-pressure flow control valve, that is, the low-pressure working pump works when the low-pressure flow valve is opened, and the low-pressure pump stops working when the flow valve is closed.

[0095] Preferably, the transition water tank water level monitoring system also includes an early warning system and an emergency braking system. The early warning system is used to send an alarm to the system when the water level in the transition tank approaches a critical value, prompting the staff to deal with it in time; the emergency braking system is used to force the low-pressure water pump and the low-pressure flow control valve to close when the water level in the transition tank reaches or exceeds the critical water level to prevent accidents.

[0096] Preferably, the pressure control system is connected to the mine cooling cycle refrigeration system to monitor the pressure of the cooling water system in real time to ensure that the pressure of the low-pressure water after pressurization is the same as that of the refrigeration circuit.

[0097] Preferably, a coordination system is further included between the high-pressure water pump and the high-pressure flow control valve, that is, the high-pressure flow valve is opened when the high-pressure working pump is working, and the flow valve is closed when the high-pressure pump stops working.

[0098] Although the present invention has been disclosed as above with preferred embodiments, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A deep stope ventilation and refrigeration system using return air, characterized in that: It includes an air shaft, a return air cooling tower, a refrigeration unit, and a mine air cooler. Fresh air is input into the mine through the air shaft, and then the return air is heat exchanged through the return air cooling tower. The hot water cooled in the return air cooling tower is heat exchanged with the refrigerant of the refrigeration unit. The refrigerant of the refrigeration unit is cooled and then heat exchanged with the hot water from the mine air cooler. The hot water from the mine air cooler is cooled and then enters the mine air cooler. The air entering the mine air cooler is cooled and then transported to the mine, thereby achieving the effect of cooling the mine environment. The air coming out of the mine air cooler enters the air distributor. The air coming out of the distributor is divided into multiple paths and enters different positions of the mining field respectively. The air distributor includes a horizontal box, one end of which is an air inlet and the other end is an air outlet, and there are multiple air outlets; a guide plate is arranged inside the horizontal box, and the guide plate is a straight plate, which is set in two pieces. The two guide plates extend from the two side walls in the left and right directions of the horizontal box to the air flow direction inside the horizontal box, and the two guide plates are staggered inside the horizontal box; the acute angle between the guide plate and the side wall is θ, the length of the guide plate is S, and the distance between the lowest end point of the two guide plates and the air inlet of the air outlet is H; the distance between the two side walls is L; (S cosθ) / H=a (S sinθ) / L) 2 -b ((S sinθ) / L)+c, where cosθ and sinθ are the cosine and sine functions of the angle θ, and a, b, c are parameters, where 9.915 <a<9.920,6.149<b<6.153,1.075<c<1.085。 2. The system according to claim 1, characterized in that The return air air cooling tower is located at the upper part of the refrigeration unit, the mining field air cooler is located at the lower part of the refrigeration unit, and the mining field is located at the lower part of the mining field air cooler.

3. The system according to claim 1, characterized in that The fluid flow between the refrigeration unit and the mine air cooler is driven by a variable frequency pump. The air volume required in each mine is first sent to the air cooler of each mine by the variable frequency fan for cooling, and then transported to each mine by the ventilation hose.

4. The system according to claim 1, characterized in that It includes a water tank, which is arranged between the refrigeration unit and the field air cooler. The refrigeration unit cools the hot water sent by the field air cooler. The water cooled in the refrigeration unit is collected in the water tank, and the cold energy is stored in the water tank.

Images