Composite mixed-flow air cooler with peak device

Abstract

The invention relates to the technical field of heat exchange equipment, and particularly discloses a composite mixed-flow air cooler with a peak device. The device comprises a shell, an induced draft fan, a medium transfer pipe, a water feeding pipe, a first adjusting valve, a water feeding tee joint, a second adjusting valve, cooling filler, an evaporation coil, an evaporation coil adjusting air inlet window, a cooling filler adjusting air inlet window, an air cooler adjusting air inlet window, a medium inlet, a circulating water tank, an air cooler, a fogging bed, an air mixing chamber and a cooling filler water distribution device. And the evaporation coil pipe water distribution device comprises a medium outlet and a water collector. The system has multiple operation modes, such as a peak operation mode, a summer operation mode, a spring and autumn combined operation mode, a water cut-off operation mode and an anti-freezing mode, and can meet different use scenes. And a mixed-flow type drop flow cooling and condensing technology and a condensing, recycling and reheating technology are originally created, so that multiple functions of saving water and energy and eliminating white fog are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat exchange equipment, and particularly relates to a composite mixed-flow air cooler with a peak device. Background Art

[0002] With the development of industrial technology and the increasing requirements for equipment performance in various industries, the importance of cooling and condensing devices has become increasingly prominent in many fields. Traditional open and closed cooling systems have their own advantages and disadvantages and are difficult to meet the requirements of complex working conditions. In the open cooling system, the circulating water directly exchanges heat with the external environment, with strong cooling ability and low cost, but it is easily polluted, leading to equipment corrosion and scaling, affecting the equipment life and operation efficiency; in the closed cooling system, the medium is cooled through a closed loop, which can avoid external pollution, but the heat dissipation efficiency is low, and it may not be able to meet the heat exchange requirements in high-temperature environments. Moreover, both of these systems rely on water evaporation and heat absorption to remove heat, resulting in a huge industrial water consumption. As water resources are non-renewable economic energy, water conservation in industrial production is crucial for sustainable development and also helps to alleviate the water shortage situation.

[0003] Common closed cooling and condensing devices include air coolers and evaporative cooling condensers. An air cooler uses air as the cooling medium to cool or condense the process medium (heat flow) in the pipe to the required temperature; in an evaporative cooling condenser (referred to as an evaporative cooler for short), the medium does not directly contact the air. The nozzles in the device spray water onto the evaporation coil, and through the evaporation, heat transfer of the spray water and the temperature rise of the air, the heat of the medium in the evaporation coil is transferred to the atmosphere.

[0004] Common structural forms of evaporative coolers include countercurrent, cocurrent, and crossflow. The countercurrent evaporative cooler has the highest heat transfer efficiency, but affected by the ambient wet-bulb temperature, when the wet-bulb temperature is high in the southern region, the countercurrent evaporative cooler requires a large heat exchange area, so the cocurrent and crossflow evaporative coolers appear.

[0005] As Figure 1 shown, in the cocurrent evaporative cooler, the evaporation coil is located above the packing. The spray water in the water tank is transported to the nozzles above the evaporation coil by a spray water pump and evenly sprayed on the pipe wall of the evaporation coil. After spraying, the spray water rises in temperature through evaporation and heat transfer, and then falls to the cooling packing under the action of gravity. After being cooled by the packing, it falls back into the water tank, and so on. However, its structure has obvious disadvantages: Disadvantage 1: Both the air inlet and the air outlet are located at the upper part of the equipment and are adjacent. Under the influence of the natural crosswind, the hot and humid air at the fan outlet is easily refluxed to the air inlet, affecting the heat exchange effect of the evaporation coil.

[0006] Disadvantage 2: As the main heat exchange component, the air inlet of the evaporation coil is located at the upper part of the coil, the air outlet is located on the side of the coil and close to the fan, and there is a dead zone in the air flow path, affecting the heat exchange effect.

[0007] Disadvantage 3: The evaporation coil and the cooling filler share a fan. Since their static pressure losses are different and their face velocities are different, it is impossible to achieve the optimal face velocity and air volume required for their respective heat exchanges.

[0008] Disadvantage 4: The evaporation coil and the cooling filler share a set of spray systems. In seasons other than peak seasons, the spray water in the cooling filler area is always cooled and evaporated, resulting in waste of spray water.

[0009] Disadvantage 5: The cooling filler is prone to salt and scale blockage, resulting in performance degradation. Since a set of spray systems is shared, the spray water passes through the evaporation coil and the cooling filler from top to bottom. If the cooling filler needs to be repaired and cleaned, the entire machine has to be shut down, affecting production operation.

[0010] Disadvantage 6: It cannot operate dry without water. During winter operation, the windward side of the cooling filler is more likely to be iced and cracked.

[0011] Disadvantage 7: It cannot operate dry when stopped. During winter operation, due to the low ambient temperature, the white fog phenomenon at the fan outlet is serious, causing corrosion, icing of surrounding equipment and environmental pollution.

[0012] In the cross-flow evaporative cooler, the evaporation coil and the cooling filler are arranged alternately (one layer of coil and one layer of filler). They share a fan and a spray system, and also have the above five disadvantages. In addition, its air inlet is located on the side of the equipment and the air outlet is located at the upper part of the equipment. Affected by the height of the equipment, the face velocities and air volumes of each layer of coil and filler are different, and the evaporation coil and the cooling filler cannot achieve the best heat exchange effect. Summary of the Invention

[0013] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a composite cross-flow air cooler with a peak device. This air cooler has multiple functions such as peak operation mode, summer operation mode, combined operation mode in spring and autumn, water cut-off operation mode, and anti-freezing mode, and solves the problems in the background technology.

[0014] The present invention provides the following technical solutions: A composite cross-flow air cooler with a peak device, comprising a housing, a medium circulation system and an air treatment system; The medium circulation system includes an air cooler and an evaporation coil connected in series in sequence, and the medium circulates between the two through a medium transfer pipe; The air treatment system includes an independently controlled cooling filler and an evaporation coil air inlet window group, and the air inlet window group includes a cooling filler adjustable air inlet window, an evaporation coil adjustable air inlet window and an air cooler adjustable air inlet window; By adjusting the opening and closing combination of the air inlet window group, the switching between the peak operation mode, the summer operation mode, the combined operation mode in spring and autumn, the water cut-off operation mode and the anti-freezing mode is realized.

[0015] Preferably, the air cooler and the evaporation coil are connected in series through a medium transfer pipe, and the medium first flows through the air cooler and then enters the evaporation coil; the cooling filler and the spray system of the evaporation coil are arranged in parallel through a water supply tee. The spray system of the cooling filler is controlled by a first regulating valve, and the spray system of the evaporation coil is controlled by a second regulating valve.

[0016] Preferably, the air inlet window of the cooling filler and the air inlet window of the evaporation coil are respectively located on the sides of the cooling filler and the evaporation coil; the air inlet window of the air cooler is located on the side of the mixing chamber. All three are air inlet windows with adjustable opening degrees and are controlled manually, pneumatically or electrically.

[0017] Preferably, a water collector is provided on one side of the evaporation coil, and a fogging bed is arranged below the air cooler; in the combined operation mode in spring and autumn, after the humid and hot air is preliminarily dewatered by the water collector, it is mixed and condensed with the fresh cold air introduced through the air inlet window of the air cooler in the mixing chamber, and then further dewatered by the "fogging bed", and finally discharged after being heated by the air cooler.

[0018] Preferably, in the antifreeze mode, all air inlet windows are closed, the induced draft fan provided in the air cooler is shut down, the circulating water pump is closed, the spray water is drained, and the internal temperature is maintained by the waste heat of the air cooler and the evaporation coil.

[0019] Preferably, the cooling filler is a cross-flow filler, and the material is PVC, fiberglass or stainless steel; the evaporation coil is a counter-flow coil, and the heat exchange component is of a tube type, plate type or tube-fin type structure.

[0020] Preferably, the heat exchange area of the air cooler is 0.01 - 10 times that of the evaporation coil, and the air volume distribution is realized by adjusting the opening degree of the air inlet window; the induced draft fan adjusts its operating state or frequency according to the ambient temperature or the medium outlet temperature.

[0021] Compared with the prior art, the present invention has the following beneficial effects: The present invention relates to a composite mixed-flow air cooler with a peak device, which combines the advantages of open and closed systems. The cooling filler only serves as a peak device, playing a role in peak shaving in extreme weather in summer, and being shut down in non-peak seasons, reducing the evaporation consumption of spray water, achieving the purpose of water saving, and avoiding the unreasonable use of the cooling filler in spring, autumn and winter; the medium in the closed system is not easily polluted, ensuring the safe operation of the system equipment.

[0022] It has the advantages of both air cooling and wet cooling. In summer, the air cooler acts as a heat exchange supplement to remove part of the heat load and reduce the water consumption of the evaporator coil; in spring and autumn, the two operate together, and the air cooler removes more heat load, further reducing the evaporation consumption of the evaporator coil spray water; in winter, the air cooler acts as the main heat exchanger to remove most of the heat, and the evaporator coil can be operated without water; in summer, the evaporator coil has a better heat exchange effect than the air cooler, and as the ambient temperature decreases, the heat exchange effect of the air cooler gradually takes the lead, and the two complement each other throughout the year.

[0023] Original mixed flow drip cooling condensation technology. The dry cooling fresh air has low temperature and low relative humidity, and forms a countercurrent flow with the evaporating coil medium, with high heat exchange efficiency; the spray water forms a drip flow spray through the evaporating coil water distribution device, and the spray liquid film is more uniform, which improves the heat exchange efficiency.

[0024] Original condensation recovery and reheating technology. In the spring and autumn joint operation mode, the air cooler adjusts the air inlet window to introduce new cold air, and the saturated hot and humid air at the outlet of the evaporator coil is partially condensed with it in the air mixing chamber, and the fog bed recycles the condensed water; the partially condensed humid air is heated by the air cooler and then discharged, the temperature rises, and it is far away from the 100% relative humidity line, so it is not easy to produce white fog.

[0025] After the humid hot air at the outlet of the evaporator coil is heated by the air cooler, its temperature increases and its density decreases. After being discharged from the equipment by the fan, it is not easy to produce white fog and humid hot air reflux.

[0026] The optimum oncoming wind speed and air volume required for heat exchange between the cooling filler and the evaporating coil can be adjusted by adjusting the air inlet window of the cooling filler and the air inlet window of the evaporating coil.

[0027] The cooling filler is shut down during the non-peak season, so there is ample time for inspection, cleaning and maintenance, with little impact on normal production operations.

[0028] The high-temperature medium first passes through the air cooler to take away part of the heat, and the medium-temperature medium enters the evaporator coil to continue cooling or condensing, which can reduce the spray water temperature, enhance the heat exchange capacity of the evaporator coil, and slow down the salt scaling and corrosion of the evaporator coil.

[0029] The evaporator coil is located at the bottom of the equipment, and its heat exchange coil is easy to plug, repair and maintain. It can be operated without water, reducing the risk of ice and cracking of cooling filler and evaporator coil. It has an anti-freeze mode to ensure that the equipment can survive the winter smoothly. One machine has multiple uses and multiple functions to meet different usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show some embodiments of the present invention, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.

[0031] Figure 1 It is a schematic diagram of a typical counter-flow cooling tower structure in the prior art.

[0032] Figure 2 It is a side view of a composite mixed-flow air cooler with a peak device according to the present invention.

[0033] Figure 3 It is a schematic diagram of the peak operation mode of a composite mixed-flow air cooler with a peak device according to the present invention.

[0034] Figure 4 It is a schematic diagram of the summer operation mode of a composite mixed-flow air cooler with a peak device according to the present invention.

[0035] Figure 5 It is a schematic diagram of the combined operation mode in spring and autumn of a composite mixed-flow air cooler with a peak device according to the present invention.

[0036] Figure 6 It is a schematic diagram of the water cut-off operation mode of a composite mixed-flow air cooler with a peak device according to the present invention.

[0037] Figure 7 It is a schematic diagram of the anti-freezing mode of a composite mixed-flow air cooler with a peak device according to the present invention.

[0038] Figure 8 It is a thermodynamic state diagram of the condensate recovery and reheating technology according to the present invention.

[0039] The names corresponding to the respective marks in the figure: 1. Housing; 2. Induced draft fan; 3. Medium transfer pipe; 4. Water supply pipe; 5. Control valve 1; 6. Water supply tee; 7. Control valve 2; 8. Cooling filler; 9. Evaporation coil; 10. Evaporation coil adjustable air inlet window; 11. Cooling filler adjustable air inlet window; 12. Air cooler adjustable air inlet window; 13. Medium inlet; 14. Circulation water tank; 15. Air cooler; 16. Mist bed; 17. Mixed air chamber; 18. Cooling filler water distribution device; 19. Evaporation coil water distribution device; 20. Medium outlet; 21. Water collector. Detailed embodiments

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and do not particularly refer to the order or sequence. Nor are they used to limit the present invention. They are merely used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions and technical features between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0043] A composite mixed-flow air cooler with a peak device, comprising a housing 1, a medium circulation system and an air treatment system; the medium circulation system includes an air cooler 15 and an evaporation coil 9 connected in series in sequence, and the medium flows between them through a medium transfer pipe 3; the air treatment system includes independently controlled cooling packing 8 and an air inlet window group of the evaporation coil 9, and the air inlet window group includes a cooling packing adjustable air inlet window 11, an evaporation coil adjustable air inlet window 10 and an air cooler adjustable air inlet window 12; by adjusting the opening and closing combinations of the air inlet window group, the switching between the peak operation mode, the summer operation mode, the spring and autumn combined operation mode, the water cut-off operation mode and the anti-freezing mode is realized.

[0044] The air cooler 15 and the evaporation coil 9 are connected in series through a medium transfer pipe 3, and the medium first flows through the air cooler 15 and then enters the evaporation coil 9; the spray systems of the cooling packing 8 and the evaporation coil 9 are arranged in parallel through a water supply tee 6, the spray system of the cooling packing is controlled by a regulating valve 1 5, and the spray system of the evaporation coil 9 is controlled by a regulating valve 2 7.

[0045] The cooling filler adjusting air inlet window 11 and the evaporative coil adjusting air inlet window 10 are respectively located on the sides of the cooling filler 8 and the evaporative coil 9; the air cooler adjusting air inlet window 12 is located on the side of the air mixing chamber 17. All three are air inlet windows with adjustable opening degrees and are controlled manually, pneumatically or electrically.

[0046] A water collector 21 is provided at the outlet of the evaporative coil 9, and a fogging bed 16 is arranged below it; in the combined operation mode in spring and autumn, after the humid and hot air is preliminarily dewatered by the water collector 21, it is mixed and condensed with the fresh cold air introduced through the air cooler adjusting air inlet window 12 in the air mixing chamber 17, and then discharged after being heated by the air cooler 15.

[0047] In the antifreeze mode, all air inlet windows are closed, the induced draft fan 2 provided in the air cooler is stopped, the circulating water pump is closed, the spray water is drained, and the internal temperature is maintained by the waste heat of the air cooler 15 and the evaporative coil 9.

[0048] In actual operation, a variable frequency fan is used to adjust the induced draft fan. The equipment may be larger and may be configured with multiple variable frequency or industrial frequency motors. The stable medium outlet temperature is achieved by adjusting the operating state of the industrial frequency motor and the speed of the variable frequency motor.

[0049] The cooling filler 8 is a cross-flow filler, and the material is PVC, fiberglass or stainless steel; the evaporative coil 9 is a counter-flow coil, and the heat exchange component is of a tube type, plate type or tube-fin type structure. The heat exchange area of the air cooler 15 is 0.01 - 10 times that of the evaporative coil 9, and the air volume distribution is achieved by adjusting the opening degree of the air inlet window; the induced draft fan 2 adjusts its operating state or frequency according to the ambient temperature or the medium outlet temperature.

[0050] Combined Figure 2 、 Figure 3 A description is made of the structure of the present invention: A composite counter-flow air cooler with a peak device includes a housing 1, an induced draft fan 2, a medium transfer pipe 3, an upper water pipe 4, a regulating valve 1 5, an upper water tee 6, a regulating valve 2 7, a cooling filler 8, an evaporative coil 9, an evaporative coil adjusting air inlet window 10, a cooling filler adjusting air inlet window 11, an air cooler adjusting air inlet window 12, a medium inlet 13, a circulating water tank 14, an air cooler 15, a fogging bed 16, an air mixing chamber 17, a cooling filler water distribution device 18, an evaporative coil water distribution device 19, a medium outlet 20, and a water collector 21. As Figure 2 and Figure 3 shown, an induced draft fan 2 and a cooling filler water distribution device 18 are provided at the top of the housing 1, and a circulating water tank 14 is arranged at the bottom. As Figure 3 shown, from top to bottom between the cooling filler water distribution device 18 and the circulating water tank 14 are the cooling filler 8, the evaporative coil water distribution device 19, and the evaporative coil 9. As Figure 3As shown, a cooling filler adjustment air inlet window 11 is provided on the side of the cooling filler 8, and an evaporative coil adjustment air inlet window 10 is provided on the side of the evaporative coil 9. As Figure 2 shown, the cooling filler adjustment air inlet window 11 and the evaporative coil adjustment air inlet window 10 are respectively fixed to the housing 1. As Figure 2 shown, the cooling filler water distribution device 18 and the evaporative coil water distribution device 19 are connected to the circulation water tank 14 through a spray water pump and a water supply pipe 4 to form a spray circuit, and the two are connected in parallel through a water supply tee 6, a regulating valve I 5 and a regulating valve II 7 on the water supply pipe 4. As Figure 3 shown, the lower part of the induced draft fan 2 from top to bottom is an air cooler 15, a fogging bed 16, and a mixing chamber 17. An air cooler adjustment air inlet window 12 is provided on the side of the mixing chamber 17, and a water collector 21 is provided at the air outlet of the evaporative coil 9. As Figure 2 、 Figure 3 shown, the air cooler 15 and the evaporative coil 9 are connected in series through a medium transfer pipe 3. The medium enters the air cooler 15 through the medium inlet 13 and is cooled or condensed, then enters the evaporative coil 9 through the medium transfer pipe 3 and continues to be cooled or condensed, and finally is discharged from the medium outlet 20.

[0051] As an implementable mode, in terms of the operation mode: combined with Figure 2 、 Figure 3The peak operation mode of the present invention is described as follows: When a composite mixed-flow air cooler with a peak device is in the peak operation mode, the air inlet window 10 of the evaporation coil and the air inlet window 11 of the cooling filler are opened, and the air inlet window 12 of the air cooler is closed. Under the action of the induced draft fan 2, the air passes through the cooling filler 8 and the evaporation coil 9 respectively and then mixes in the air mixing chamber 17. The low-temperature mixed air then passes through the air cooler 15 and is finally discharged into the atmosphere by the induced draft fan 2. The regulating valve 5 is opened and the regulating valve 7 is closed. The spray water in the circulating water tank 14 is conveyed to the cooling filler water distribution device 18 through the circulating water pump. Under the action of gravity, the spray water flows downward through the cooling filler 8, the evaporation coil water distribution device 19, and the evaporation coil 9 and then falls back into the circulating water tank 14 for circulation. The spray water evaporates and cools through the cooling filler 8 and then falls into the evaporation coil water distribution device 19 for secondary distribution and re-water distribution. The spray water in the form of drip flow is formed by the holes on the evaporation coil water distribution device 19. The drip flow spray water cooled by the cooling filler 8 forms a uniform water film on the heat exchange tube surface of the evaporation coil 9. On the one hand, the low-temperature mixed air formed by the air outlet of the cooling filler 8 and the evaporation coil 9 after mixing in the air mixing chamber 17 is utilized by the air cooler 15 for heat exchange. The heat load of the evaporation coil 9 decreases accordingly, and the spray evaporation water volume decreases, playing a role in water saving. On the other hand, the medium is first partially cooled or condensed by the air cooler 15, the temperature of the medium entering the evaporation coil 9 is low, and the spray water temperature is also low. On the third hand, the cooling filler 8 serves as a peak shaving device, further reducing the spray water temperature and increasing the temperature difference between the spray water and the medium in the evaporation coil 9. In extreme summer weather, the heat exchange efficiency of the evaporation coil 9 is significantly improved, playing a peak shaving role.

[0052] As an implementable mode, combined with Figure 2 , Figure 4 The summer operation mode of the present invention is described as follows: When a composite mixed-flow air cooler with a peak device is in the summer operation mode, the air inlet window 10 of the evaporation coil is opened, and the air inlet windows 11 of the cooling filler and 12 of the air cooler are closed. Under the action of the induced draft fan 2, the air passes through the evaporation coil 9 and the water separator 21, and then the low-temperature air passes through the air cooler 15 and is finally discharged into the atmosphere by the induced draft fan 2. The regulating valve 5 is closed and the regulating valve 7 is opened. The spray water in the circulating water tank 14 is conveyed to the evaporation coil water distribution device 19 through the circulating water pump. The spray water in the form of drip flow is formed by the holes on the evaporation coil water distribution device 19. The drip flow spray water forms a uniform water film on the heat exchange tube surface of the evaporation coil 9. In the summer operation mode, the cooling filler 8 is in a shutdown state, the evaporation coil 9 and the air cooler 15 are in an operating state, and there is sufficient time for maintenance, cleaning and maintenance of the cooling filler 8. The low-temperature air at the outlet of the evaporation coil 9 is utilized by the air cooler 15 for heat exchange. The heat load of the evaporation coil 9 decreases accordingly, and the spray evaporation water volume decreases, playing a role in water saving.

[0053] As an implementable mode, combined with Figure 2 ,Figure 5 Describe the combined operation mode of the present invention in spring and autumn: When the combined operation mode of the composite mixed-flow air cooler with a peak device is in spring and autumn, the air inlet window 10 of the evaporation coil and the air inlet window 12 of the air cooler are opened, and the air inlet window 11 of the cooling filler is closed. Under the action of the induced draft fan 2, the air passes through the evaporation coil 9 and the air inlet window 12 of the air cooler, and after mixing in the mixing chamber 17, the low-temperature mixed air then passes through the air cooler 15, and finally is discharged to the atmosphere by the induced draft fan 2. The first regulating valve 5 is closed, and the second regulating valve 7 is opened. The spray water in the circulating water tank 14 is transported to the evaporation coil water distribution device 19 through the circulating water pump, and forms a drip flow spray through the holes on the evaporation coil water distribution device 19. The drip flow spray water forms a uniform water film on the heat exchange tube surface of the evaporation coil 9. In spring and autumn, the environmental temperature is low. When the environmental temperature is lower than the outlet air temperature of the evaporation coil 9, this mode can be executed. Taking the transition process from summer to winter as an example, as the environmental temperature decreases, the air inlet window 12 of the air cooler gradually opens, and the overall heat load of the unit gradually transfers to the air cooler 15, and the heat load of the evaporation coil 9 decreases. On the one hand, the heat load that the evaporation coil 9 needs to take away decreases. On the other hand, due to the opening of the air inlet window 12 of the air cooler, the face velocity of the evaporation coil 9 is low and the air volume is small, and the consumption of evaporation, drift, sewage discharge, etc. of the spray water also decreases accordingly, achieving the best water-saving effect in spring and autumn; on the other hand, due to the gradual opening of the air inlet window 12 of the air cooler, the overall pressure drop of the unit decreases, and the equipment energy consumption decreases accordingly. According to the heat exchange area selected for the air cooler 15 and the evaporation coil 9, as the environmental temperature continues to decrease, the air inlet window 11 of the cooling filler can also be opened accordingly. At this time, the overall water consumption and energy consumption of the combined operation mode in spring and autumn are the least.

[0054] As an implementable mode, combined with Figure 2 、 Figure 6 Describe the water cut-off operation mode of the present invention: When the water cut-off operation mode of the composite mixed-flow air cooler with a peak device is in operation, the air inlet window 10 of the evaporation coil, the air inlet window 11 of the cooling filler, and the air inlet window 12 of the air cooler are opened. Under the action of the induced draft fan 2, the air passes through the evaporation coil 9, the cooling filler 8, and the air inlet window 12 of the air cooler, and after mixing in the mixing chamber 17, the low-temperature mixed air then passes through the air cooler 15, and finally is discharged to the atmosphere by the induced draft fan 2. After reaching the water cut-off temperature, this mode is executed. At this time, only the dry operation of the air cooler 15 and the evaporation coil 9 can ensure the required medium outlet temperature. The air cooler 15 is the main heat exchange unit, and the evaporation coil 9 is the auxiliary heat exchange unit. Since the air inlet window 11 of the cooling filler and the air inlet window 12 of the air cooler are opened, the overall equipment pressure drop of the unit is the lowest and the energy consumption is the lowest. On the one hand, as the environmental temperature decreases, the energy consumption of the fan decreases; on the other hand, there is no consumption of spray water in the water cut-off operation mode, achieving a win-win situation of energy conservation and water conservation.

[0055] As an implementable mode, combined withFigure 2 , Figure 7 Description of the anti-freezing mode of the present invention: When the anti-freezing mode of a composite mixed-flow air cooler with a peak device is in operation, the air inlet window 10 of the evaporation coil, the air inlet window 11 of the cooling filler, and the air inlet window 12 of the air cooler are closed, the induced draft fan 2 is shut down, the circulating water pump is closed, and the spray water in the circulating water tank 14 is drained completely. The equipment can be cut out of the system through a bypass. At this time, the medium in the equipment should be drained completely. The medium can also flow through the air cooler 15, the medium transfer pipe 3, and the evaporation coil 9 of the equipment, and the equipment participates in the system operation. Since the relevant air inlet windows are closed, the induced draft fan 2 will not generate suction force. At the same time, the medium in the air cooler 15 and the evaporation coil 9 retains heat, and a warm room is formed inside the equipment, which is beneficial to preventing the equipment from freezing.

[0056] Description of the mixed-flow dropwise flow cooling and condensation technology: Now in combination with Figure 3 Description is made of the mixed-flow dropwise flow cooling and condensation technology of the present invention: The medium of a composite mixed-flow air cooler with a peak device enters the evaporation coil 9 through the medium transfer pipe 3 and is finally discharged from the medium outlet 20. The overall flow direction of the medium is from left to right. The fresh cold air enters the evaporation coil 9 through the air inlet window 10 of the evaporation coil, and the flow direction is from right to left, forming a countercurrent sensible heat exchange with the medium. The fresh cold air has a low temperature and relative humidity, and exchanges heat with the heat exchange unit on the medium outlet side, strengthening the heat exchange of the medium end temperature. The spray water forms a dropwise flow spray through the holes on the water distribution device 19 of the evaporation coil. The spray liquid droplets of the dropwise flow drip downwards onto each layer of the heat exchange unit of the evaporation coil 9, forming a cross-flow form with the medium and the air. On the one hand, the spray liquid droplets of the dropwise flow continuously impact the heat exchange unit of the evaporation coil 9, forming many tiny turbulent interfaces, enhancing the heat transfer between the spray water and the heat exchange unit, and reducing the possibility of fouling and impurity attachment; on the other hand, the liquid droplets are in more sufficient contact with the air, the evaporation rate is high, and the heat exchange efficiency of the evaporation coil 9 is higher. Through the liquid level height, hole size, and hole spacing in the water distribution tank of the water distribution device 19 of the evaporation coil, the spray water volume, uniformity, and droplet size are all within a controllable range, avoiding the disadvantages of uneven spraying, dry spots, and spray drift caused by the extensive spraying through nozzles in the prior art.

[0057] Affected by factors such as the cooling and condensation of the working medium in the pipe and anti-freezing during shutdown, the structural layout of the evaporation coil 9 can be adjusted to different forms.

[0058] Description of the condensation recovery and reheating technology: Now in combination with Figure 5 , Figure 8The condensation recovery and reheating technology of the present invention will be described. The present invention relates to a composite mixed-flow air cooler with a peak device. When the ambient temperature is lower than the outlet air temperature of the evaporation coil 9, the combined operation mode in spring and autumn is executed. The spray water evaporates on the heat exchange wall surface of the evaporation coil 9 and absorbs the heat of the medium. The air temperature rises and the relative humidity increases. After the small droplets mixed in the air are collected by the water collector 21, the relative humidity of the air leaving the water collector 21 is close to 100%. At this time, the ambient temperature is lower than the temperature of the hot and humid air leaving the water collector 21. Combining Figure 8 , the thermodynamic state point of the hot and humid air at the outlet of the evaporation coil 9 is point A. The ambient fresh and cold air enters the mixing chamber 17 through the air cooler regulating air inlet window 12, and the hot and humid air at the outlet of the evaporation coil 9 is mixed and condensed with the fresh and cold air. Combining Figure 8 , it can be seen that the hot and humid air at the outlet of the evaporation coil 9 continuously cools and condenses along the 100% equal relative humidity line, and the condensed water is precipitated to point B. In the figure, △T is the temperature drop of the hot and humid air at the outlet of the evaporation coil 9 after mixing and condensation, and △D is the amount of condensed water precipitated after mixing and condensation, that is, the secondary water saving amount. The precipitated low-temperature condensed water falls back to the circulation water tank 14 and is continuously used for the spray circulation. Combining Figure 5 , the low-temperature saturated air after mixing is discharged into the atmosphere after being heated by the air cooler 15 under the action of the induced draft fan 2. Combining Figure 8 , its thermodynamic state point rises from point B to point C, the temperature rises and the relative humidity decreases, moving away from the 100% equal relative humidity line. The hot and humid air point C discharged into the atmosphere is mixed with the ambient dry and cold air point N (such as the connection line between point C and point N), and it is not easy to generate an intersection with the 100% equal relative humidity line, thus playing the role of eliminating white fog. If the hot and humid air at the outlet of the evaporation coil 9 is not condensed, recovered and reheated, its thermodynamic state point is like point A. The connection line between point A and point N intersects with the 100% equal relative humidity line, and the W area is the area where white fog is generated. When the ambient air temperature is lower and the relative humidity is higher, it is easier to generate white fog. The condensation recovery and reheating technology of the present invention can effectively prevent the generation of white fog and recover part of the condensed water, achieving the purpose of eliminating white fog and saving water.

[0059] On the premise of not violating the principles of the present invention, all simplification treatments made are within the protection scope of the present invention. For example: canceling the air cooler, which is a change at the cost of losing the heat exchange and demisting functions of the air cooler; canceling the air cooler's adjustable air inlet window, which is a change at the cost of losing the fan energy consumption; canceling the water distribution device of the evaporation coil, which is a change at the cost of losing the uniform air distribution of the double channels of the cooling filler and the evaporation coil; canceling the water supply tee, regulating valve and water distribution device of the evaporation coil, which is a change at the cost of losing the peak function; canceling the adjustable opening function of the cooling filler's adjustable air inlet window and the evaporation coil's adjustable air inlet window, which is a change at the cost of losing the optimal air volume required by the cooling filler and the evaporation coil (i.e., the optimal heat exchange and water-saving performance); canceling the adjustable opening function of the air cooler's adjustable air inlet window and the evaporation coil's adjustable air inlet window, which is a change at the cost of losing the optimal air volume required by the air cooler and the evaporation coil (i.e., the optimal heat exchange and water-saving performance); canceling the fogging bed, which is a change at the cost of losing the secondary water collection function and the effect of preventing the air cooler from corrosion; canceling the cooling filler's adjustable air inlet window, the evaporation coil's adjustable air inlet window and the air cooler's adjustable air inlet window, which is a change at the cost of losing the anti-freezing function, etc.

[0060] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications; any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite mixed-flow air cooler with a peak device, characterized in that: It includes a housing (1), a medium circulation system, and an air treatment system; The medium circulation system includes an air cooler (15) and an evaporation coil (9) connected in series in sequence, and the medium circulates between them through a medium transfer pipe (3); The air treatment system includes independently controlled cooling packing (8) and an air inlet window group of the evaporation coil (9), and the air inlet window group includes a cooling packing regulating air inlet window (11), an evaporation coil regulating air inlet window (10), and an air cooler regulating air inlet window (12); By adjusting the opening and closing combination of the air inlet window group, the switching between the peak operation mode, summer operation mode, spring and autumn combined operation mode, water cut-off operation mode, and anti-freezing mode is realized.

2. The composite mixed-flow air cooler with a peak device according to claim 1, wherein The air cooler (15) and the evaporation coil (9) are connected in series through a medium transfer pipe (3), and the medium first flows through the air cooler (15) and then enters the evaporation coil (9); the spraying systems of the cooling packing (8) and the evaporation coil (9) are arranged in parallel through a water supply tee (6), the spraying system of the cooling packing is controlled by a regulating valve I (5), and the spraying system of the evaporation coil (9) is controlled by a regulating valve II (7).

3. The composite mixed-flow air cooler with a peak device according to claim 1, characterized in that, The cooling packing regulating air inlet window (11) and the evaporation coil regulating air inlet window (10) are respectively located on the sides of the cooling packing (8) and the evaporation coil (9); the air cooler regulating air inlet window (12) is located on the side of the mixing chamber (17), and all three are air inlet windows capable of adjusting the opening degree and are controlled manually, pneumatically, or electrically.

4. The composite mixed-flow air cooler with a peak device according to claim 1, characterized in that, A water collector (21) is provided on one side of the evaporation coil (9), and a fogging bed (16) is arranged below the air cooler (15); in the spring and autumn combined operation mode, the humid and hot air is preliminarily dewatered by the water collector (21), mixed and condensed with the fresh cold air introduced through the air cooler regulating air inlet window (12) in the mixing chamber (17), further dewatered by the fogging bed (16), and finally discharged after being heated by the air cooler (15).

5. The composite mixed-flow air cooler with a peak device according to claim 1, characterized in that, In the anti-freezing mode, all air inlet windows are closed, the induced draft fan (2) provided in the air cooler is stopped, the circulating water pump is closed, the spraying water is drained, and the internal temperature is maintained by the waste heat of the air cooler (15) and the evaporation coil (9).

6. The composite mixed-flow air cooler with a peak device according to claim 1, characterized in that, The cooling packing (8) is a cross-flow packing, and the material is PVC, fiberglass, or stainless steel; the evaporation coil (9) is a counter-flow coil, and the heat exchange component is of a tube type, plate type, or tube-fin type structure.

7. A composite mixed-flow air cooler with a peak device according to claim 5, characterized in that, The heat exchange area of the air cooler (15) is 0.01 - 10 times that of the evaporation coil (9), and the air volume distribution is realized by adjusting the opening degree of the air inlet window; the induced draft fan (2) adjusts its operating state or frequency according to the ambient temperature or the medium outlet temperature.

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