Ventilation refrigeration system provided with high and low pressure water replenishing device

Abstract

The application provides a ventilation refrigeration system provided with a high-low pressure water supplement device, characterized in that the high-low pressure water supplement device comprises a normal-pressure water supplement tank, a filtering water purification 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 supplement 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 supplement tank is connected with the transition water supplement tank through pipelines, and the filtering water purification device, the low-pressure flow control valve and the low-pressure water pump are sequentially arranged in the pipeline between the normal-pressure water supplement tank and the transition water supplement tank. The low-pressure flow control valve is connected with the low-pressure water pump, the transition water supplement tank is connected with the high-pressure water pump through pipelines, the high-pressure flow control valve and the high-pressure water pump are sequentially arranged in the pipeline between the transition water supplement tank and the high-pressure water pump, and the high-pressure water pump is connected with a mine cooling loop. The application can not only meet the water supplement demand, but also avoid that the normal-pressure water is directly sent into a high-pressure environment by the water pump, reduces the power consumption of the pump, prolongs the service life of the pump, reduces the accident rate and improves the stability of the system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of deep metal mine stope cooling, and specifically discloses a deep metal mine stope ventilation cooling system using return air, which can effectively reduce the underground environmental temperature, reduce the high-pressure heat exchange equipment of the cooling system on the surface, and improve the safety and stability of the system. BACKGROUND

[0002] In the deep mining process, the underground thermal environment is deteriorating. With the increase of mining depth, the working face of the mine is affected by high temperature after entering the deep part, which not only restricts the safety production and construction of the mine, but also threatens the health of the miners. According to the Metal Nonmetallic Mine Safety Regulations of China, the air temperature of the production mine mining working face should not exceed 26℃, and the air temperature of the electromechanical equipment chamber should not exceed 30℃. When the air temperature of the above two working places exceeds 30℃ and 34℃, the work must be stopped. At the same time, due to the need of the process, a large amount of temperature-stable mine wastewater is generated in the mining process. Taking a certain gold mine as an example, the existing deep mine working area (depth > 500m) mainly uses ventilation cooling, the underground temperature is high (29℃), the relative humidity is large (> 96%), the cooling effect is poor, and the thermal environment is very poor. In order to ensure the safety production of the mine and the health of the workers, effective measures must be taken to reduce the environmental temperature and control the high temperature heat.

[0003] The deep cooling technologies used at home and abroad include arranging a ventilation system, worker cooling clothes, and adding a refrigerating machine on and under the well. The existing problems are: the ventilation system becomes worse with the increase of the working depth; the worker cooling clothes is high in cost and inconvenient in operation; and the underground refrigerating machine has the problems of heat removal difficulty, poor cooling effect, and high operation cost due to the use of air as the heat dissipation medium.

[0004] The use of fluid-induced heat transfer element vibration to achieve enhanced heat transfer is a form of passive heat transfer enhancement. The vibration-induced convection heat transfer coefficient of the heat transfer element can be greatly improved at low flow rates by effectively utilizing the vibration-induced convection heat transfer coefficient of the heat transfer element. The vibration can also be used to suppress the fouling of the heat transfer element surface, reduce the fouling thermal resistance, and achieve composite heat transfer enhancement.

[0005] Heat exchanger and its related technology has made encouraging progress in the past decades, but some long-standing problems have become more prominent. Fluid-induced vibration and fouling in heat exchangers are the world's recognized outstanding problems to be solved. Fluid-induced vibration can cause severe noise and damage to heat transfer tube bundle, and fouling on the surface of heat transfer tube bundle can cause huge energy and resource loss. It is impossible to completely prevent the vibration of the tube bundle in the heat exchanger, and it is not always effective to prevent vibration by increasing the strength of the heat transfer tube bundle to avoid damage and noise of the tube bundle. Using fluid-induced vibration of heat transfer tube bundle to achieve enhanced heat transfer is a form of passive enhanced heat transfer. Through effective use of vibration, enhanced heat transfer can be achieved while suppressing fouling on the heat transfer surface, reducing fouling resistance, and achieving composite enhanced heat transfer.

[0006] Metallic mineral resources exploitation in China has turned to deep, with the increasing of mining depth and the improvement of mining mechanization, the heat damage in mine is increasingly serious, which will have a serious impact on safe and efficient production, and become a major scientific and technological problem to be solved in the metallic mining industry. The high temperature and high humidity working environment in the mine will make people feel uncomfortable, thus reducing labor productivity, increasing accident rate and affecting the safety production of mine. When people work hard in high temperature conditions, if the cooling capacity of the surrounding environment is insufficient to absorb the heat emitted by the human body, the heat balance between the heat production and the heat dissipation of the human body will be destroyed, thus causing adverse physiological and psychological reactions of the human body. The high heat environment can cause the body temperature regulation function to be out of balance.

[0007] Deep mine heat damage is a key problem of deep mining in mine, which restricts the deep mining capacity of metallic mine. In terms of heat damage control in mine, ventilation technology is the first choice for heat damage control due to its wide range of action and low operation and maintenance cost. At the same time, with the increase of mining depth below 1000 meters, the cooling capacity of the ventilation system will approach the limit, and ventilation cooling cannot solve the heat damage problem faced by deep mining, so it is necessary to develop refrigeration ventilation technology. However, the depth of mine is large, the heat exchange environment in mine is complex, the investment cost of central air conditioning system is high, it is not flexible and cannot quickly respond to the complex working conditions of mine. The water supply pipeline of water cooling tower system has a long length and large pressure difference, which has great difficulty in supplying water in deep mine. And the underground water quality is poor, which can easily cause the cooling device to be blocked and polluted during the cooling process, and is not convenient to maintain, and shortens the service life of the equipment. Therefore, the traditional refrigeration system cannot meet the production needs of mine.

[0008] Deep mine heat disaster is the key problem of deep mining of mine, which restricts the deep mining capacity of metal mine. In the aspect of heat disaster control in the mine, ventilation technology is the first choice for heat disaster prevention and control because of its wide range of action and low operation and maintenance cost. However, with the increase of mining depth, the ventilation capacity gradually reaches the limit, so the cooling water cooling system needs to be used. The cooling water supplement is particularly important for the refrigeration ventilation system. The mining depth of the metal mine is generally below 800 meters, and the cooling water system is in a high pressure state, and the pressure of the supplementary cooling water is usually much lower than that of the water in the refrigeration circuit. Direct use of the water pump to send the supplementary water into the refrigeration circuit not only has large power consumption, but also easily wears the life of the pump, even induces safety accidents, and reduces the stability of the system.

[0009] Therefore, a high and low pressure water supplement device for a deep mine stope cooling system is needed to avoid directly using the water pump to send the supplementary water into the refrigeration circuit, improve the cooling water supplement effect, reduce the accident rate, and improve the stability of the system. SUMMARY

[0010] Therefore, the technical problems to be solved by the present application are 1) the water supply difficulty and water pollution problems existing in the cooling mode of the traditional water cooling tower; 2) the problem that the pipeline of the traditional cooling mode is long and the pressure to be borne by the pipeline is too large; 3) the problem that the traditional central air conditioning technology has high investment cost, the pipeline is redundant, and is not flexible enough to face the complex and variable stope environment; and 4) a high and low pressure water supplement device for a deep mine stope cooling system is needed to avoid directly using the water pump to send the supplementary water into the refrigeration circuit, improve the cooling water supplement effect, reduce the accident rate, and improve the stability of the system.

[0011] The present application is realized by the following technical solutions:

[0012] A ventilation and refrigeration system provided with a high and low pressure water supplement device, characterized in that the high and low pressure water supplement device comprises a normal pressure water supplement tank, a filter water purification device, a low pressure flow control valve, a low pressure water pump, a water pressure early warning system, a pressure sensor, a transition water supplement tank, a water level monitoring system, a liquid pressurizing device, a high pressure flow control valve, and a high pressure water pump. The normal pressure water supplement tank and the transition water supplement tank are connected by a pipeline, and the filter water purification device, the low pressure flow control valve and the low pressure water pump are sequentially arranged in the pipeline between the normal pressure water supplement tank and the transition water supplement tank. The low pressure flow control valve is connected with the low pressure water pump, the transition water supplement tank is connected with the high pressure water pump through a pipeline, and the high pressure flow control valve and the high pressure water pump are sequentially arranged in the pipeline between the transition water supplement tank and the high pressure water pump; and the high pressure water pump is connected with the mine cooling circuit.

[0013] As preferred, the water supplement device further comprises a low-pressure water flow control system, a low-pressure water pump control system, a transition water supplement tank water level monitoring system, a liquid pressurization 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 water supplement tank and the transition water supplement tank. The low-pressure water pump control system is used to send the cooling water in the normal-pressure water supplement tank to the transition water supplement tank. The transition water supplement tank water level monitoring system is used to monitor the change of water level in the water supplement tank to prevent the water level from being too high. The liquid pressurization 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 change of 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.

[0014] As preferred, when starting work, the low-pressure flow valve is opened, the high-pressure flow valve is closed, the low-pressure cooling water is sent from the low-pressure water supplement tank to the transition water supplement tank by the water pump, the low-pressure flow control valve is then closed, the low-pressure cooling water in the transition water supplement tank is pressurized by the pressurization device to the same pressure as the mine refrigeration system circuit, the high-pressure flow control valve is then opened, and the pressurized cooling water is sent to the mine cooling system by the high-pressure water pump.

[0015] As preferred, when starting work, the high-pressure flow control valve is closed, the high-pressure pump is closed, the supplement water is sent to the pipeline from the water supplement tank by the water pump, the impurities in the supplement water are removed by the filter water device first to improve the quality of the supplement water. Then the low-pressure flow control valve is opened, and the purified supplement water is sent to the transition water supplement tank by the low-pressure water pump.

[0016] As preferred, the transition water supplement tank is provided with a water level monitoring system. When the water level of the transition water supplement tank reaches the standard water level, the system sends a signal to the control cabinet, at which time the low-pressure flow valve is closed, the low-pressure water pump is closed, and the liquid pressurization device is started.

[0017] As preferred, the water level monitoring system further comprises an alarm function. When the water level of the transition water supplement tank exceeds the critical water level, the water level monitoring system sends an alarm to the control cabinet to forcibly stop the water inflow and open the emergency water drain valve.

[0018] As preferred, the transition water tank is provided with a pressure sensor to monitor the change of pressure in the transition water tank. When the pressure in the transition water tank reaches the requirement, the pressurization device stops pressurizing.

[0019] As preferred, the system comprises a stope air cooler, the cooled air is delivered into the stope to complete the stope environment cooling, the system further comprises an air distributor, an air duct is arranged between the stope air cooler and the stope, the air distributor is arranged between the air duct and the stope air outlet, the air distributor is provided with multiple outlets corresponding to different positions of the stope, the air distributor comprises a horizontal box body, one end of the horizontal box body is an air inlet, the other end is an air outlet, the air outlet is multiple; a guide plate is arranged in the horizontal box body, the guide plate is a straight plate, two guide plates are arranged, the two guide plates extend from the two side walls of the horizontal box body to the air flow direction inside the horizontal box body, and the two guide plates are staggered in the horizontal box body.

[0020] As preferred, 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 point of the two guide plates and the air inlet of the air outlet is H, and the distance between the two side walls is L.

[0021] (S*cosθ) / H=a*((S*sinθ) / L) 2 -b*((S*sinθ) / L)+c, wherein cosθ and sinθ are cosine and sine functions of θ, a, b and c are parameters, 9.915

[0022] The present application has the following advantages:

[0023] 1. The present application provides a new air distributor, by arranging multiple guide plates in the air distributor, the air temperature at the outlet of the distributor is uniform, so that the further cooling requirement is achieved, and the service life of the product is improved.

[0024] 2. The return air position is located underground, the pipe length and height difference of the system are shortened, and the overall pressure bearing of the system is reduced.

[0025] 3. The height difference between the air cooling tower and the refrigeration unit is large, the cooling water from the air cooling tower is transported to the position of the refrigeration unit, the pressure is high, in order to avoid the damage of the high-pressure water to the refrigeration unit, an intermediate heat exchanger is used to separate the high-pressure water and the refrigeration unit, and the safety of the refrigeration unit is ensured.

[0026] 4. The return air system is used to provide cold energy instead of the water cooling tower system, and the problems of water supply difficulty and water pollution are avoided.

[0027] 5. The stope air cooler is placed in the stope roadway close to the stope, each group of stope air cooler and fan is individually used for cooling for a stope, and the pipeline between the stope air cooler and the stope is relatively short, the purpose is to refine the pipeline, when the stope changes, the air cooler, fan and pipeline corresponding to the stope can be quickly disassembled and reinstalled, in the face of complex mine internal environment, the equipment of the stope which does not need refrigeration can be quickly transferred to the newly excavated stope, and the flexibility of the system is improved.

[0028] 6. For the high-pressure working environment in the deep mine, by adding a transition water supplement tank, the originally low-pressure supplement water is pressurized to the same pressure as the cooling circuit, and then the pressurized supplement water is sent into the cooling water circuit. The application not only meets the water supplement demand, but also avoids the direct sending of normal pressure water into the high pressure environment by the water pump, reduces the power consumption of the pump, improves the service life of the pump, reduces the accident rate, and improves the stability of the system.

[0029] 7. The air distributor guide plate structure is optimized to achieve the optimal outlet air uniform temperature effect. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is the structural principle diagram of the system;

[0031] Figure 2 is a structural diagram of the air passage distributor as background technology;

[0032] Figure 3 is a structural diagram of the air passage distributor of the present application;

[0033] Figure 4 is a front view of the air passage distributor of the present application;

[0034] Figure 5 is a parameter diagram of the air passage distributor of the present application;

[0035] Figure 6 is a high-low pressure water supplement device of the deep mine stope cooling system.

[0036] In the figure: 1 is a return air cooling tower, 2 is an intermediate heat exchanger, 3 is a refrigeration unit, 4 is a water tank, 5, 6 are frequency conversion pumps, 7~12 are frequency conversion fans, 13~18 are stope air coolers, 19~24 are stope. DETAILED DESCRIPTION

[0037] The specific implementation of the present application will be further described below in combination with the drawings.

[0038] Figure 1 A deep metal mine stope ventilation and cooling system using return air is shown. As shown in Figure 1As shown, the system comprises a wind shaft, a return air cooling tower 1, a refrigeration unit 3, and stope air coolers 13-18. Fresh air is input into the mine from the wind shaft, and then the return air is subjected to heat exchange in the return air cooling tower 1. The return air cools the hot water in the return air cooling tower 1, and the cooled hot water is subjected to direct or indirect heat exchange with the refrigerant from the refrigeration unit 3. The refrigerant in the refrigeration unit 3 is cooled and subjected to heat exchange with the hot water from the stope air coolers 13-18. The hot water from the air coolers is cooled and enters the stope air coolers 13-18, and the air entering the stope air coolers is cooled and delivered to the stope, thereby achieving the effect of lowering the temperature of the stope environment.

[0039] The present application uses a return air system to provide cold energy instead of a water cooling tower system in a metal mine stope, thereby avoiding the problems of water supply difficulty and water pollution.

[0040] As a preferred embodiment, the system further comprises an intermediate heat exchanger 2. The cooled hot water enters the intermediate heat exchanger 2 and is subjected to heat exchange with the refrigerant from the refrigeration unit 3. The refrigerant from the refrigeration unit 3 is cooled and subjected to heat exchange with the hot water from the stope air coolers 13-18.

[0041] 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 location of the refrigeration unit, the pressure is high. In order to avoid damage to the refrigeration unit caused by the high-pressure water, 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 application uses an intermediate heat exchanger to separate the high-pressure water from the refrigeration unit, thereby ensuring the safety of the refrigeration unit.

[0042] As a preferred embodiment, the cooled water flowing out of the return air cooling tower is delivered to the intermediate heat exchanger by a variable frequency pump, and is used to cool the refrigerant flowing from the refrigeration unit to the intermediate heat exchanger. The present application uses an intermediate heat exchanger to separate the high-pressure water from the refrigeration unit, thereby ensuring the safety of the refrigeration unit.

[0043] As a preferred embodiment, the refrigeration unit comprises an evaporator, a condenser, a compressor, and a throttling valve.

[0044] As a preferred embodiment, the refrigerant is water.

[0045] As a preferred embodiment, the return air cooling tower 1 is located in the lower part of the ground and the upper part of the refrigeration unit and the intermediate heat exchanger. The inlet and outlet of the wind shaft are located on the ground, and the return air passage is located in the lower part of the ground. The stope air coolers are located in the lower part of the upper part of the refrigeration unit and the intermediate heat exchanger, and the stope is located in the lower part of the stope air coolers. The position of the return air in the present application is located underground, which shortens the pipe length and height difference of the system and reduces the overall pressure of the system.

[0046] As preferred, each group of stope air cooler and fan supplies cooling for one stope. The stope air cooler is placed in the stope roadway close to the stope. Each group of stope air cooler and fan supplies cooling for one stope, and the pipeline between the stope air cooler and the stope is relatively short. The purpose is to fine the pipeline. When the stope changes, the air cooler, fan and pipeline corresponding to the stope can be quickly disassembled and reinstalled. In the face of complex mine internal environment, the system can realize that the equipment of the stope which does not need refrigeration is quickly transferred to the newly excavated stope with the change of the mining stope, and the flexibility of the system is improved.

[0047] As preferred, the fluid flow between the refrigeration unit 3 and the stope air cooler is driven by a variable frequency pump. The required air volume in each stope is first sent to each stope air cooler for cooling by a variable frequency fan, and then transported to each stope by a ventilation hose.

[0048] Further, the hot water in the water tank is sent to the stope air cooler at the C depth under the action of the variable frequency pump. The air is transported to the stope air cooler under the action of the variable frequency fan. The cold quantity is transferred to the air in the stope air cooler. The hot air is transported to the stope which needs refrigeration cooling through the hose, so as to achieve the effect of reducing the temperature of the stope.

[0049] As preferred, the system includes a water tank 4 which is arranged between the refrigeration unit and the stope air cooler. The refrigeration unit cools the hot water sent by the stope air cooler. The water cooled in the refrigeration unit is collected in the water tank, and the cold quantity is stored in the water tank. Fresh air is input into the mine from the air shaft, which plays a role in ventilation and dust removal and small amplitude cooling in the mine. According to the mine environment, the return air cooling tower is arranged at the appropriate depth to extract the cold quantity in the return air. The return air is heat exchanged in the return air cooling tower. The cold and hot fluids in the return air cooling tower are arranged in cross flow. At this time, the cold quantity contained in the air is exchanged in the cooling tower. In the cooling tower, the hot water flowing from the heat exchanger to the cooling tower is cooled. Then the water is transported to the intermediate heat exchanger by 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, the water is sent to the refrigeration unit, and the cold quantity is transferred to the refrigeration unit by the water. In the refrigeration unit, the hot water sent by the stope air cooler 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 stope air cooler underground. The stope air coolers are arranged in parallel. The variable frequency fan supplies air volume for each stope air cooler. Each stope air cooler supplies cooling for the corresponding stope. The cold and hot fluids in the stope air cooler are arranged in cross flow. The cold water exchanges heat with the hot air flowing through the stope air cooler, and the cold quantity is transferred to the hot air flowing through the stope air cooler. The hot air becomes cold air after obtaining the cold quantity. The cold air transports the cold quantity to the stope which needs cooling through the hose, so as to complete the effect of reducing the temperature of the stope environment.

[0050] As preferred, the application further researches and improves the intelligent control function of the ventilation cooling system, aiming at Figure 1 the ventilation cooling system can realize multi-faceted and all-round intelligent control.

[0051] As an improvement, the air shaft outlet includes a return air fan, a pump arranged between the intermediate heat exchanger and the refrigeration unit, the air shaft outlet is provided with a temperature sensor, the temperature sensor and the return air fan are in data connection with a controller, and the controller automatically controls the power of the pump according to the measured air shaft outlet return air temperature T and the return air fan frequency P.

[0052] As preferred, when the detected temperature T decreases, the controller controls the power of the pump to increase, and when the detected temperature T increases, the controller controls the power of the pump to decrease.

[0053] As preferred, when the detected return air fan frequency P decreases, the controller controls the power of the pump to decrease, and when the detected return air fan frequency P increases, the controller controls the power of the pump to increase.

[0054] As preferred, when (t-T)*P decreases, the controller controls the power of the pump to decrease, and when the detected (t-T)*P increases, the controller controls the power of the pump to decrease. Wherein t is the set temperature, preferably 20-25 degrees Celsius.

[0055] Through further intelligent control, the application realizes the suitability of the return air temperature and the return air power to the operation of the water pump.

[0056] As shown in Figure 2 , the stope air cooler is arranged with an air duct between the stope, and an air distributor 38 is arranged between the air duct and the stope air outlet, the air distributor is provided with multiple outlets corresponding to different positions of the stope.

[0057] In operation, the air from the stope air cooler enters the air distributor 38, and the air from the air distributor 38 is divided into multiple paths and enters different positions of the stope.

[0058] As shown in Figure 2 , 3 , the air passage distributor 38 includes a horizontal box body 381, one end of the horizontal box body 381 is an air inlet, and the other end is an air outlet, the air outlet is multiple, and corresponds to different positions of the stope. Figure 2 As shown in Figure 2 , because of the problem of uneven heat exchange, the air temperature at different positions in the air passage is different, resulting in uneven distribution of air temperature in the multiple air outlets connected at the tail of the air distributor. For example ,

[0059] The present application further improves the air distributor. As an improvement, as shown in Figure 3 A flow guide plate 81 is arranged inside the horizontal box 381, which is a straight plate and arranged in two pieces, extending from the two side walls of the horizontal box 381 to the air flow direction inside the horizontal box 381, wherein the two flow guide plates 81 are staggered inside the horizontal box 381. As shown in Figure 4 and Figure 5 One flow 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, so as to realize the staggered arrangement.

[0060] The present application sets two flow guide plates, so that part of the air entering the distributor flows along the flow guide plate and is guided to the opposite direction, and the air entering from the opposite direction is fully mixed, so as to realize the uniform temperature of the air and avoid the problem caused by the uneven outlet air.

[0061] As a preferred, the connection width of each flow guide plate connected to the side wall is 50% of the height W of the side wall.

[0062] Through the above size design, on the one hand, the flow guide plates can be distributed in the space as much as possible to realize sufficient uniform temperature, and on the other hand, the short circuit phenomenon in air flow can be avoided to prevent air from flowing out from one direction, so that the air mixing can reach the optimal structure.

[0063] As a preferred, the position of the flow guide plate connected to the side wall is arranged near the inlet of the air distributor. By arranging near the inlet of the air distributor, the internal space of the air distributor is large enough to meet the full mixing and uniformity.

[0064] As a preferred, the horizontal part 381 is a rectangular cross section.

[0065] As a preferred, the flow guide plate is a straight plate.

[0066] The acute angle between the flow guide plate 81 and the side wall is θ, the length of the flow guide plate is S, the distance between the lowest end point of the two flow guide plates 81 and the air inlet of the air outlet is H, and the distance between the two side walls is L.

[0067] Through a large number of numerical simulation and experimental research, it is found that the arrangement of the guide plate 81 should comprehensively consider the distribution, mixing, resistance, vibration, etc. The included 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 is increased, and it should not be too small, which will lead to poor uniform temperature effect. The empty section h should not be too large, which will lead to too long structure and increase the cost, and it should not be too small, which will lead to that the mixed gas cannot be fully mixed, and otherwise the local flow rate near the outlet is too high, which is not conducive to uniform temperature and uniform flow. The length of the guide plate needs to be changed according to the change of the included angle, otherwise the guide plate is too long under the condition that the included angle is too large, which increases the resistance, and the guide plate is too short under the condition that the included angle is too small, which leads to poor mixing effect. Therefore, the best structure optimization relationship is determined through numerical simulation and experimental research.

[0068] (S*cosθ) / H=a*((S*sinθ) / L) 2 -b*((S*sinθ) / L)+c, wherein cosθ and sinθ are cosine and sine functions of θ angle, a, b and c are parameters, wherein 9.915

[0069] Further preferably, a=9.9175, b=6.151, and c=1.080.

[0070] As a preferred, 2.11>S*cosθ / H>0.1, 0.25<S*sinθ / L<0.75, and 20°<θ<70°.

[0071] As a preferred, with the increase of the angle θ, the length S of the guide plate is continuously reduced.

[0072] As a preferred, with the increase of L, H is continuously increased.

[0073] As a preferred, with the decrease of the angle θ, H is continuously increased.

[0074] In order to prevent the vibration of the guide plate, as a preferred, the thickness of the guide plate should not be less than 2mm.

[0075] As a preferred, 40<S<50mm, 180<h<200mm, 70<L<80mm, and 22<w<27mm.

[0076] Through the design of the guide plate, the temperature of the air in the air passage distributor can reach the best uniform temperature effect under the condition of meeting the heat exchange requirement.

[0077] As an improvement, the application further discloses a high-low pressure water supplementing device for a deep mine stope cooling system. Figure 6As shown, the high and low pressure water supplement system used in deep mine provided by the present application comprises normal pressure water supplement tank, filtering and purifying device, low pressure flow control valve, low pressure water pump, water pressure early warning system, pressure sensor, transition water supplement tank, water level monitoring system, liquid pressurizing device, high pressure flow control valve and high pressure water pump. The normal pressure water supplement tank is connected with the transition water supplement tank by pipeline, and the filtering and purifying device, the low pressure flow control valve and the low pressure water pump are sequentially arranged in the pipeline between the normal pressure water supplement tank and the transition water supplement tank. The low pressure flow control valve is connected with the low pressure water pump, the transition water supplement tank is connected with the high pressure water pump by pipeline, and the high pressure flow control valve and the high pressure water pump are sequentially arranged in the pipeline between the transition water supplement tank and the high pressure water pump. The high pressure water pump is connected with the mine cooling circuit.

[0078] The water supplement device comprises a low pressure water flow control system, a low pressure water pump control system, a transition water supplement 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 for controlling the flow of cooling water between the normal pressure water supplement tank and the transition water supplement tank; the low pressure water pump control system is used for sending the cooling water in the normal pressure water supplement tank to the transition water supplement tank; the transition water supplement tank water level monitoring system is used for monitoring the change of water level in the water supplement tank to prevent the water level in the water supplement tank from being too high; the liquid pressurizing system is used for pressurizing the cooling water in the transition tank to the same working pressure as the mine cooling circuit; the pressure control system is used for monitoring the change of 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 for regulating and controlling the flow of cooling water between the transition water tank and the cooling circuit; and the high pressure water pump control system is used for sending the pressurized cooling water in the transition water tank to the cooling circuit.

[0079] When starting to work, the low pressure flow valve is opened, the high pressure flow valve is closed, the low pressure cooling water is sent into the transition water supplement tank by the water pump from the low pressure water supplement tank, then the low pressure flow control valve is closed, the low pressure cooling water in the transition water supplement tank is pressurized by the pressurizing device 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 by the high pressure water pump.

[0080] When starting to work, the high pressure flow control valve is closed, the high pressure pump is closed, the supplement water is sent into the pipeline from the water supplement tank by the water pump, the impurities in the supplement water are removed by the filtering and purifying device first to improve the quality of the supplement water. Then the low pressure flow control valve is opened, and the purified supplement water is sent into the transition water supplement tank by the low pressure water pump.

[0081] The transition water supplement tank is provided with a water level monitoring system, when the water level of the transition water supplement 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 closed, and the liquid pressurizing device is started at the same time.

[0082] As a further improvement of the above-mentioned embodiment, the water level monitoring system further comprises an alarm function, when the water level of the transition water 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 emergency water outlet valve, thereby improving the stability of the system.

[0083] As a further improvement of the above-mentioned embodiment, the transition water tank further comprises a water outlet valve.

[0084] The transition water tank is provided with a pressure sensor, which can monitor the change of the pressure in the transition water tank, and when the pressure in the transition water tank reaches the requirement, the pressurizing device stops pressurizing.

[0085] As a further improvement of the above-mentioned embodiment, the pressure sensor is connected to the refrigeration circuit pressure system, which can sense the change of the pressure in the cooling circuit in real time, and feed back the information to the control console, which can match the pressure in real time to ensure that the pressure in the transition water tank meets the pressure requirement.

[0086] When the pressure in the transition water tank is too high, the pressure warning device sends an alarm to the control cabinet, and the transition water tank is urgently depressurized to prevent accidents caused by excessive pressure.

[0087] As a further improvement of the above-mentioned embodiment, the water tank further comprises a safety valve to improve the stability of the system.

[0088] After the pressurization is completed, the high-pressure flow control valve is opened, and the high-pressure water pump is opened to send the pressurized supplementary water into the cooling circuit.

[0089] As a preferred embodiment, the low-pressure water flow control system, the low-pressure water pump control system, the transition water tank water level monitoring system, the liquid pressurizing system, the pressure control system, the high-pressure water flow control system, and the high-pressure water pump control system are provided.

[0090] The low-pressure water flow control system is used to control the flow of cooling water between the low-pressure water tank and the transition water tank.

[0091] The low-pressure water pump control system is used to send the cooling water in the low-pressure water tank to the transition water tank.

[0092] The transition water tank water level monitoring system is used to monitor the change of the water level in the water tank to prevent the water level from being too high.

[0093] 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.

[0094] The pressure control system is used to monitor the change of the water pressure in the transition water tank to prevent the water pressure from being too high and causing accidents.

[0095] 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.

[0096] The high-pressure water pump control system is used to send the pressurized cooling water in the transition water tank to the cooling loop.

[0097] As a preference, the low-pressure water flow control system further comprises a cooling water purification filter device, which is arranged between the water supply tank and the low-pressure water pump, and is used to filter the impurities in the cooling water.

[0098] As a preference, a coordinated control system is further arranged between the low-pressure water pump and the low-pressure flow control valve, i.e., 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.

[0099] As a preference, the transition water supply tank water level monitoring system further comprises a pre-warning system and an emergency braking system, the pre-warning system is used to send a warning to the system when the water level in the transition tank approaches a critical value, prompting the staff to handle in time, and the emergency braking system is used to forcibly close the low-pressure water pump and the low-pressure flow control valve when the water level in the transition tank reaches or exceeds the critical water level, preventing accidents from happening.

[0100] As a preference, the pressure control system is connected with the mine cooling circulation refrigeration system, and is used to monitor the pressure of the cooling water system in real time, so as to ensure that the pressure of the pressurized low-pressure water is the same as that of the refrigeration loop.

[0101] As a preference, a coordinated system is further arranged between the high-pressure water pump and the high-pressure flow control valve, i.e., the high-pressure flow valve is opened when the high-pressure working pump works, and the flow valve is closed when the high-pressure pump stops working.

[0102] Although the present application has been disclosed with reference to the preferred embodiments, it is not limited to the above. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A deep stope ventilation refrigeration system utilizing return air, characterized by, The system comprises a wind shaft, a return air cooling tower, a refrigeration unit, a stope air cooler, fresh air is input into the mine from the wind shaft, then the return air is heat exchanged in the return air cooling tower, the cooled hot water in the 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 stope air cooler, the hot water from the air cooler is cooled, the cooled hot water from the air cooler enters the stope air cooler, the air in the stope air cooler is cooled, and the cooled air is transported to the stope; the return air cooling tower is located at the lower part of the ground and the upper part of the refrigeration unit and the intermediate heat exchanger; the system further comprises a high-low pressure water supplement device, the high-low pressure water supplement device comprises a normal pressure water supplement tank, a filtered water 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 supplement 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 supplement tank is connected with the transition water supplement tank by a pipeline, the filtered water device, the low pressure end flow control valve and the low pressure water pump are sequentially arranged in the pipeline between the normal pressure water supplement tank and the transition water supplement tank; the low pressure end flow control valve is connected with the low pressure water pump, the transition water supplement tank is connected with the high pressure water pump by a pipeline, the high pressure end flow control valve and the high pressure water pump are sequentially arranged in the pipeline between the transition water supplement tank and the high pressure water pump; the high pressure water pump is connected with the mine cooling circuit; an air duct is arranged between the stope air cooler and the stope, an air distributor is arranged between the air duct and the stope air outlet, the air distributor comprises a horizontal box body, one end of the horizontal box body is an air inlet, the other end is an air outlet, and the air outlet is a plurality of air outlets; a guide plate is arranged in the horizontal box body, the guide plate is a straight plate and is arranged as two pieces, the two guide plates extend from the two side walls of the horizontal box body to the air flow direction in the horizontal box body, and the two guide plates are staggered in the horizontal box body; 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, and the distance between the two side walls is L. (S x cos θ) / H = a x ((S x sin θ) / L) 2 - b x ((S x sin θ) / L) + c, where cos θ, sin θ are the cosine and sine functions of the angle θ, a, b, c are parameters, where 9.915 < a < 9.920, 6.149 < b < 6.153, 1.075 < c < 1.

085.

2. The system of claim 1, wherein, The water supplement device further comprises a low pressure water flow control system, a low pressure water pump control 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 for controlling the flow of cooling water between the normal pressure water supplement tank and the transition water supplement tank; the low pressure water pump control system is used for sending the cooling water in the normal pressure water supplement tank to the transition water supplement tank; the water level monitoring system is used for monitoring the water level change in the transition water supplement tank to prevent the water level in the transition water supplement tank from being too high; the liquid pressurizing device is used for pressurizing the cooling water in the transition water supplement tank to the same working pressure as the mine cooling circuit; the pressure control system is used for monitoring the water pressure change in the transition water supplement tank to prevent the water pressure from being too high and causing accidents; the high pressure water flow control system is used for regulating and controlling the flow of cooling water between the transition water supplement tank and the cooling circuit; and the high pressure water pump control system is used for sending the pressurized cooling water in the transition water supplement tank to the cooling circuit.

3. The system of claim 2, wherein, When starting work, the low-pressure end flow control valve is opened, the high-pressure end flow control valve is closed, the low-pressure cooling water enters the transition water supply tank from the normal-pressure water supply tank through the low-pressure water pump, the low-pressure end flow control valve is closed after the low-pressure cooling water is pressurized to the same pressure as the mine refrigeration system loop by the liquid pressurizing device in the transition water supply tank, the high-pressure end flow control valve is opened, and the pressurized cooling water is sent to the mine cooling system through the high-pressure water pump.

4. The system of claim 2, wherein, When starting work, the high-pressure end flow control valve is closed, the high-pressure water pump is closed, the supplementary water is sent into the pipeline from the normal-pressure water supply tank through the water pump, the impurities in the supplementary water are removed through the filtered water device to improve the water quality of the supplementary water, then the low-pressure end flow control valve is opened, and the purified supplementary water is sent into the transition water supply tank through the low-pressure water pump.

5. The system of claim 2, wherein, A water level monitoring system is arranged at the transition water supply tank, and when the water level of the transition water supply tank reaches the standard water level, the system sends a signal to the control cabinet, at which time the low-pressure end flow control valve is closed, the low-pressure water pump is closed, and the liquid pressurizing device is started.

6. The system of claim 2, wherein, The water level monitoring system also includes an alarm function, and when the water level of the transition water supply tank exceeds the critical water level, the water level monitoring system sends an alarm to the control cabinet to forcibly stop the water inlet and open the emergency water drain valve.

7. The system of claim 2, wherein, The transition water supply tank is provided with a pressure sensor to monitor the change of the pressure in the transition water supply tank, and when the pressure in the transition water supply tank reaches the requirement, the liquid pressurizing device stops pressurizing.

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