Air-cooling closed circulating cooling water system

Abstract

The utility model discloses an air-cooling closed circulating cooling water system which comprises a cooling energy-saving group and a heat preservation water tank, the cooling energy-saving set comprises a cooling water machine and a natural air cooling machine, a first water outlet main pipe, a second water outlet main pipe and a water return pipe are arranged on the heat preservation water tank, a three-way valve is arranged at the end, away from the heat preservation water tank, of the first water outlet main pipe, and the other two connectors of the three-way valve are connected with the cooling water machine and the natural air cooling machine through two pipelines respectively. Water outlets in the cooling-water machine and the natural air cooling machine are connected with the heat preservation water tank through a pipeline to form a circulation loop, the second water outlet main pipe can convey cooling water to a use point, and the cooling water used at the use point flows back into the heat preservation water tank through the water return pipe. In the operation process, unnecessary water and electricity resource loss can be avoided, the operation cost is reduced, and the stability of cooling water supply is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling water systems, in particular to an air-cooled and closed-circuit cooling water system. Background Art

[0002] In the process cooling water system in the industrial field, the cooling water has a large flow rate and a large temperature difference. Therefore, the cooling load of the cooling water system is large. The cooling load is mainly related to the production output and is less affected by the outdoor ambient temperature. Even in winter when the outdoor ambient temperature is very low, the cooling load of the process cooling water system is still relatively large. Therefore, a chiller needs to operate refrigeration throughout the year to provide chilled water.

[0003] The currently used chillers are open cooling towers or closed cooling towers. When in use, both of them continuously spray water and are equipped with fans installed on their tops for suction, so that the water evaporates to absorb heat to achieve the purpose of cooling the water. This method will cause a large amount of water resource loss during the use process, resulting in high operation energy consumption and operation costs of the chiller.

[0004] Therefore, there is a need to provide an air-cooled and closed-circuit cooling water system to solve the above problems. Summary of the Utility Model

[0005] In order to overcome the above disadvantages, the purpose of the utility model is to provide an air-cooled and closed-circuit cooling water system, which can avoid unnecessary water and electricity resource losses during the operation process, reduce the operation cost, and ensure the stability of the cooling water supply.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: an air-cooled and closed-circuit cooling water system, including a cooling energy-saving group and a heat preservation water tank; the cooling energy-saving group includes a chiller and a natural air-cooling machine. The heat preservation water tank is provided with a first outlet main pipe, a second outlet main pipe and a return pipe. One end of the first outlet main pipe far away from the heat preservation water tank is provided with a three-way valve. The other two interfaces on the three-way valve are respectively connected to the chiller and the natural air-cooling machine through two pipelines. The water outlets on the chiller and the natural air-cooling machine are respectively connected to the heat preservation water tank through a pipeline to form a circulation loop. The second outlet main pipe can transport the cooling water to the use point, and the cooling water after being used at the use point flows back to the heat preservation water tank through the return pipe.

[0007] Further, the natural air-cooling machine includes an installation frame and at least two groups of fan bodies installed on its top. A finned tube group is arranged below the fan body, and a spray pipe is arranged around the finned tube group below it. A plurality of nozzles are spaced apart on one side of the spray pipe facing the finned tube.

[0008] The high-temperature water pumped out from the heat preservation water tank enters the finned tubes through the water inlet on the natural air-cooling machine, and heat exchange occurs between the finned tubes and the external natural environment under the action of the fan body, thereby reducing the temperature of the water in the finned tubes. A temperature sensor is also provided on the side of the finned tubes, which can real-time feedback the temperature of the cooled water in the finned tubes. When the temperature is higher than the set value of the cooling water, the solenoid valve opens, and several nozzles on the water spray pipe located below the finned tubes spray water mist towards the direction of the finned tubes to accelerate the cooling of the water in the finned tubes.

[0009] Further, the fan body is an axial flow fan. The axial flow fan has overheat protection, which can effectively prevent the fan coil in the fan body from overheating, without additional maintenance, thereby reducing the maintenance cost of the enterprise. And the axial flow fan has high stability during use, which can ensure a stable air volume for the finned tubes.

[0010] Further, the top of the heat preservation water tank is provided with an openable water tank top cover, and the inside is divided into a high-temperature water storage tank and a cooling water storage tank through a water tank partition. A through hole is opened at the bottom of the water tank partition for the water in the two storage tanks to flow through each other. The high-temperature water storage tank is used to store the high-temperature water that needs to be cooled, that is, tap water, and the cooling water storage tank is used to store the cooling water processed by the chiller or the natural air-cooling machine. The whole heat preservation water tank is separated through the water tank partition on the premise that the tap water and the cooling water can flow through each other, so as to better control the water temperature of the water supplied in the whole heat preservation water tank to achieve constant temperature water supply.

[0011] Further, the first outlet main pipe and the second outlet main pipe are respectively arranged on the sides of the high-temperature water storage tank and the cooling water storage tank that are far away from each other. The return pipe is located on the high-temperature storage tank and is not connected to the first outlet main pipe. The relatively high-temperature tap water is sucked into the chiller or the natural air-cooling machine for cooling under the action of the first outlet main pipe, and the cooling water that reaches the set temperature after cooling flows into the cooling water storage tank through the pipeline. The second outlet main pipe is connected to the processing point that needs to supply cooling water outside, so as to pump the cooling water to the required use point. The cooling water after being used at the use point will be recycled to the high-temperature water storage tank for re-cooling use. This recycling process can effectively reduce the water consumption and achieve the effect of water conservation.

[0012] Further, it also includes an installation platform, a filtering mechanism, a water treatment mechanism, a water replenishing mechanism and a control cabinet. The chiller, the natural air-cooling machine, the water treatment mechanism, the heat preservation water tank, the filtering mechanism and the control cabinet are integrated on the installation platform, and the natural air-cooling machine is erected on the top of the heat preservation water tank. Integrating the above structures on the same installation platform makes the structure of the whole cooling water system more compact and beautiful during use.

[0013] Further, the water treatment mechanism includes an automatic chemical dosing device and a soft water tank. The automatic chemical dosing device includes a chemical agent barrel and a chemical agent pump located thereon. The pump port of the chemical agent pump and the port of the soft water tank are both connected to the heat preservation water tank. There are two chemical agent barrels, which are respectively filled with a biological inhibitor and a metal corrosion inhibitor. The two agents are automatically pumped into the cooling water storage tank on the heat preservation water tank through the chemical agent pump, so that the cooling water subsequently transported to the equipment at the use point can prevent the growth of bacteria and slow down metal corrosion, thereby avoiding abnormal damage to the production equipment at the use point.

[0014] Further, a waterproof cover is provided on the top of the chemical agent barrel to shield it. This prevents dirty water from entering the chemical agent barrel and affecting the performance of the agents inside.

[0015] Further, a water replenishing mechanism is also included. The water replenishing mechanism includes a water replenishing tank, which is connected to the heat preservation water tank through a water replenishing pipeline. A water pump three, a one-way valve, and a soft water tank are sequentially arranged on the water replenishing pipeline. By setting this water replenishing mechanism, when it is detected that the water in the heat preservation water tank is insufficient, it can automatically replenish water into the heat preservation water tank. The setting of the soft water tank can package calcium, magnesium ions, bicarbonate, etc. in the water to generate nano-scale crystals that are insoluble in water, thereby inhibiting the generation of scale and reducing the maintenance of equipment.

[0016] Further, a water pump one and a water pump two are respectively arranged on the first outlet main pipe and the second outlet main pipe. The water pump one and the water pump two are used to suck high-temperature water or cooling water.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. In the present utility model, the chiller, the natural air cooler, the three-way valve, and the heat preservation water tank cooperate with each other. The chiller and the natural air cooler are in a parallel structure and do not work synchronously. That is, when one of them participates in the water cooling cycle, the other is in a closed state. According to the comparison between the ambient temperature and the set temperature of the cooling water, the three-way valve controls the switching of the working state and the closed state of the chiller and the natural air cooler in real time, so that unnecessary water and electricity resource losses can be avoided during the operation of the cooling water system, the operation cost can be reduced, and the stability of the cooling water supply can be ensured.

[0019] 2. In the present utility model, by installing a water spray pipe below the finned tube, when the temperature of the water in the finned tube is higher than the set value of the cooling water, the solenoid valve is opened, and several nozzles on the water spray pipe located below the finned tube spray water mist towards the direction of the finned tube. The evaporation of water absorbs heat to assist in accelerating the cooling of the water in the finned tube and improving the cooling efficiency.

[0020] 3. In the present utility model, a water treatment mechanism is provided, which can automatically add a biological inhibitor and a metal corrosion inhibitor to the cooling water storage tank, effectively prevent abnormal damage to the production equipment using the cooling water, and reduce the maintenance cost of the enterprise. Brief Description of the Drawings

[0021] Figure 1 It is an axonometric view of the overall structure of an embodiment of the present utility model;

[0022] Figure 2 It is a flow chart of the cooling water system of an embodiment of the present utility model;

[0023] In the figure: 1, installation platform; 2, cooling energy-saving group; 21, chiller; 22, natural air-cooling machine; 221, installation frame; 222, fan body; 223, finned tube; 224, water spray pipe; 225, nozzle; 3, electric proportional valve; 4, water pump one; 5, water pump two; 6, water treatment mechanism; 61, automatic dosing device; 611, chemical agent barrel; 612, chemical agent pump; 62, soft water tank; 63, waterproof cover; 7, heat preservation water tank; 71, water tank partition board; 72, cooling water storage tank; 73, high-temperature water storage tank; 8, filtering mechanism; 9, control cabinet; 10, water replenishing mechanism; 101, water replenishing tank; 11, outlet main pipe one; 12, outlet main pipe two. Detailed Embodiment

[0024] The following elaborates on the preferred embodiments of the present utility model in conjunction with the attached drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0025] Refer to the attached Figures 1 to 2 As shown, an air-cooled, closed-circuit cooling water system in this embodiment includes a cooling energy-saving group 2 and a heat preservation water tank 7; the cooling energy-saving group 2 includes a chiller 21 and a natural air-cooling machine 22, and the heat preservation water tank 7 is provided with an outlet main pipe one 11, an outlet main pipe two 12 and a return pipe. One end of the outlet main pipe one 11 away from the heat preservation water tank 7 is provided with a three-way valve, and the other two interfaces on the three-way valve are respectively connected to the chiller 21 and the natural air-cooling machine 22 through two pipelines. The water outlets on the chiller 21 and the natural air-cooling machine 22 are respectively connected to the heat preservation water tank 7 through a pipeline to form a circulation loop. The outlet main pipe two 12 can transport the cooling water to the use point, and the cooling water after being used at the use point flows back to the heat preservation water tank 7 through the return pipe.

[0026] The chiller 21 and the natural air-cooling machine 22 are in a parallel structure and do not work synchronously. That is, when one of them participates in the water cooling cycle, the other is in a closed state, and the working state and closed state of the chiller 21 and the natural air-cooling machine 22 are switched in real time by the three-way valve. A circulation loop for cooling water recovery is also formed between the heat preservation water tank 7 and the use point. During this process, it can be ensured that there will be no waste of water resources, and the recycled water can be used again after being treated.

[0027] When the cooling water system is working:

[0028] When the external environmental temperature is low enough to provide all the cooling capacity required for cooling the high-temperature water to the set temperature of the cooling water (i.e., in winter), the chiller 21 stops working, and the natural air-cooling machine 22 starts to work. The high-temperature water in the heat preservation water tank 7 is pumped into the natural air-cooling machine 22. The natural air-cooling machine 22 forms a heat exchange between the cold energy of nature and the high-temperature water pumped into it and flowing, and reduces the temperature of the high-temperature water to the set temperature of the required cooling water.

[0029] Regarding the water consumption description of the chiller 21: Taking a 200T cooling water tower as an example, the cooling water flow rate is 200m 3 / h. Considering the cooling water consumption at 1.5%, the daily water consumption is 200m 3 / h×24h×0.015 = 72 tons per day. Calculated according to 300 days per year: 300×72 tons per day = 21600 tons. It can be shown that in the above environment, without using the chiller 21, the energy consumption during the use of the chiller 21 can be minimized, reducing the enterprise costs and water and electricity resources.

[0030] When the external environment is lower than the set temperature of the cooling water but cannot supply enough cooling capacity to cool the high-temperature water to the above set temperature (i.e., in the transitional season), the natural air-cooling machine 22 works first. On the three-way valve, the valve port connected to the natural air-cooling machine 22 is opened, and the water in the heat preservation water tank 7 is first pumped into the natural air-cooling machine 22 for preliminary cooling using the cold energy of nature. After the cooling water circulation between the natural air-cooling machine 22 and the heat preservation water tank 7 ends, the valve port connected to the natural air-cooling machine 22 on the three-way valve is closed. At this time, the valve port connected to the chiller 21 is opened, and the pre-cooled water in the heat preservation water tank 7 is pumped into the chiller 21 for secondary refrigeration until the water temperature reaches the set temperature of the cooling water. In this process, the energy consumption of the chiller 21 is greatly reduced compared to only using the chiller 21.

[0031] When the external environmental temperature is higher than the set temperature of the cooling water (i.e., in summer), only the valve port of the three-way valve connected to the chiller 21 is opened, and the natural air-cooling machine 22 stops working.

[0032] It should be noted that the internal structure of the chiller 21 in this application is prior art. The chiller 21 here can be a screw chiller 21 or an air-cooled chiller 21.

[0033] In some embodiments, the three-way valve is an electric proportional valve 3.

[0034] The natural air-cooling machine 22 includes an installation frame 221 and at least two groups of fan bodies 222 installed on its top. Below the fan bodies 222, there is a group of finned tubes 223. A water spray pipe 224 is arranged around the group of finned tubes 223 below. On the side of the water spray pipe 224 facing the finned tubes 223, a number of nozzles 225 are spaced apart.

[0035] The high-temperature water pumped out from the heat preservation water tank 7 enters the finned tubes 223 from the water inlet on the natural air-cooling machine 22, and heat exchange occurs between the finned tubes 223 and the external natural environment under the action of the fan bodies 222, thereby reducing the temperature of the water in the finned tubes 223. A temperature sensor is also arranged on the side of the finned tubes 223, which can timely feedback the temperature of the cooled water in the finned tubes 223. When the temperature is higher than the set value of the cooling water, the solenoid valve is opened, and a number of nozzles 225 on the water spray pipe 224 below the finned tubes 223 spray water mist towards the finned tubes 223 to accelerate the cooling of the water in the finned tubes 223.

[0036] Compared with the continuous spraying of water in the existing cooling water tower, and then cooperating with the suction of the fan installed on its top to make the water evaporate and absorb heat to achieve the purpose of cooling the water, the amount of water sprayed by the water spray pipe 224 and the nozzles 225 on the natural air-cooling machine 22 in this application can be ignored.

[0037] The water spray pipe 224 is connected to the heat preservation water tank 7 through a pipeline, and a one-way valve is arranged on the pipeline. The one-way valve enables the water in the heat preservation water tank 7 to be sucked into the water spray pipe 224 to supply water to the water spray pipe 224. When the solenoid valve is opened, the water in the heat preservation water tank 7 can be sprayed out from the nozzles 225 to form water mist to assist the group of finned tubes 223 in cooling the water inside.

[0038] It should be noted that the water supply end providing water for the water spray pipe 224 is not limited to only the heat preservation water tank 7, and it can also be other water storage tanks not connected to the heat preservation water tank 7.

[0039] The fan body 222 is an axial flow fan. The axial flow fan has overheat protection, which can effectively prevent the fan coil in the fan body 222 from overheating, without additional maintenance, thereby reducing the maintenance cost of the enterprise. And the axial flow fan has high stability during use, and can ensure a stable air volume is provided for the finned tubes 223.

[0040] A water tank top cover that can be opened is provided at the top of the heat preservation water tank 7. Inside, it is divided into a high-temperature water storage tank 73 and a cooling water storage tank 72 by a water tank partition plate 71. A through hole is opened at the bottom of the water tank partition plate 71 to allow the water in the two storage tanks to flow through each other. The high-temperature water storage tank 73 is used to store high-temperature water that needs to be cooled, that is, tap water. The cooling water storage tank 72 is used to store the cooling water processed by the chiller 21 or the natural air cooler 22. The entire heat preservation water tank 7 is separated through the water tank partition plate 71 on the premise that the tap water and the cooling water can flow through each other, so as to better control the water temperature of the water supplied in the entire heat preservation water tank 7 to achieve constant temperature water supply.

[0041] Specifically, the water outlet on the chiller 21 or the natural air cooler 22 is connected to the cooling water storage tank 72 through a pipeline. After the cooled water flows out from the water outlet, it directly enters the cooling water storage tank 72.

[0042] The first main water outlet pipe 11 and the second main water outlet pipe are respectively arranged on the sides of the high-temperature water storage tank 73 and the cooling water storage tank 72 that are far away from each other. The return water pipe is located on the high-temperature storage tank and is not connected to the first main water outlet pipe 11. So that the relatively high-temperature tap water is sucked into the chiller 21 or the natural air cooler 22 for cooling under the action of the first main water outlet pipe 11, and the cooling water that reaches the set temperature after cooling flows into the cooling water storage tank 72 through a pipeline. The second main water outlet pipe 12 is connected to the processing point that needs to supply cooling water externally, so as to pump the cooling water to the required use point. The cooling water after being used at the use point will be recycled to the high-temperature water storage tank 73 for reuse after cooling. This recycling process can effectively reduce the amount of water resources used and achieve the effect of water conservation.

[0043] It also includes an installation platform 1, a filtering mechanism 8, a water treatment mechanism 6, a water replenishing mechanism 10 and a control cabinet 9. The chiller 21, the natural air cooler 22, the water treatment mechanism 6, the heat preservation water tank 7, the filtering mechanism 8 and the control cabinet 9 are integrated on the installation platform 1, and the natural air cooler 22 is erected on the top of the heat preservation water tank 7. Integrating the above structures on the same installation platform 1 makes the structure of the entire cooling water system more compact and beautiful during use.

[0044] It should be noted that the filtering mechanism 8 here is a prior art and can be any known filter that can filter impurities in water. Specifically, it can be an activated carbon filter. The filtering mechanism 8 here is used to filter the high-temperature water that flows back into the high-temperature water storage tank 73 after being used at the use point, so as to prevent impurities, particles, etc. from remaining in the chiller 21 and the natural air cooler 22 during water cooling, reduce the maintenance of the chiller 21 or the natural air cooler 22, and thus reduce the cost of the enterprise.

[0045] The water treatment mechanism 6 includes a chemical dosing device 61 and a soft water tank 62. The chemical dosing device 61 includes a chemical agent barrel 611 and a chemical agent pump 612 located thereon. The pump port of the chemical agent pump 612 and the port of the soft water tank 62 are both connected to the heat preservation water tank 7. There are two chemical agent barrels 611, which are respectively filled with a biological inhibitor and a metal corrosion inhibitor. The two agents are automatically pumped into the cooling water storage tank 72 on the heat preservation water tank 7 through the chemical agent pump 612, so that the cooling water transported to the equipment at the use point can prevent the growth of bacteria and slow down metal corrosion, thereby avoiding abnormal damage to the production equipment at the use point. In some embodiments, specifically, the water treatment mechanism 6 is connected to the cooling water storage tank 72.

[0046] A waterproof cover 63 is provided on the top of the chemical agent barrel 611 to cover it. This can prevent dirty water from entering the chemical agent barrel 611 and affecting the performance of the chemical agent therein.

[0047] It further includes a water replenishing mechanism 10. The water replenishing mechanism 10 includes a water replenishing tank 101. The water replenishing tank 101 is connected to the heat preservation water tank 7 through a water replenishing pipeline, and a water pump three, a one-way valve and the soft water tank 62 are sequentially arranged on the water replenishing pipeline. By setting up this water replenishing mechanism 10, when it is detected that the water in the heat preservation water tank 7 is insufficient, it can automatically replenish water into the heat preservation water tank 7. The setting of the soft water tank 62 can package calcium, magnesium ions, bicarbonate, etc. in the water to generate nano-scale crystals insoluble in water, thereby inhibiting the generation of water scale, and thus reducing the maintenance of the equipment.

[0048] A water pump one 4 and a water pump two 5 are respectively arranged on the outlet main pipe one 11 and the outlet main pipe two 12. The suction of high-temperature water or cooling water is realized through the water pump one 4 and the water pump two 5.

[0049] Since the cooling water circulation pipeline of the circulating cooling water system of this application is closed, therefore, by using the water treatment mechanism of this application, the corrosion of the pipeline caused by the growth of bacteria or other reasons during the continuous reuse of the circulating water can be effectively reduced. Thus, it is ensured that the cooling system has a longer service life and long-term performance stability. Thereby, the overall lower use cost and water consumption of the cooling system are achieved.

[0050] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An air-cooled, closed-loop cooling water system, characterized in that: It includes a cooling energy-saving group and an insulated water tank; the cooling energy-saving group includes a chiller and a natural air cooler, the insulated water tank is provided with a water outlet main pipe 1, a water outlet main pipe 2 and a return pipe, the water outlet main pipe 1 is provided with a three-way valve at the end away from the insulated water tank, the other two interfaces on the three-way valve are respectively connected to the chiller and the natural air cooler through two pipelines, the water outlets on the chiller and the natural air cooler are respectively connected to the insulated water tank through a pipeline to form a circulation loop, the water outlet main pipe 2 can transport cooling water to the use point, and the cooling water after use at the use point flows back to the insulated water tank through the return pipe.

2. An air-cooled, closed-loop cooling water system according to claim 1, characterized in that: The natural air cooler includes a mounting frame and at least two groups of fan bodies mounted on the top thereof, a fin tube group is arranged below the fan body, a water spray pipe is arranged around the fin tube group below, and a plurality of nozzles are arranged at intervals on one side of the water spray pipe facing the fin tube.

3. An air-cooled, closed-circulation cooling water system according to claim 2, characterized in that: The fan body is an axial flow fan.

4. The air-cooled, closed-loop cooling water system according to claim 1, characterized in that: The top of the insulated water tank is provided with an openable water tank top cover, and the inside is divided into a high-temperature water storage tank and a cooling water storage tank by a water tank partition. A through hole is provided at the bottom of the water tank partition to allow water in the two water tanks to circulate between each other.

5. An air-cooled, closed-circulation cooling water system according to claim 4, characterized in that: The water outlet main pipe 1 and the water outlet main pipe 2 are respectively arranged on the side away from each other of the high-temperature water storage tank and the cooling water storage tank. The return pipe is located on the high-temperature water storage tank and is not connected with the water outlet main pipe 1.

6. The air-cooled, closed-circulation cooling water system according to claim 1, characterized in that: It also includes an installation platform, a filtering mechanism, a water treatment mechanism, a water replenishing mechanism and a control cabinet. The chiller, natural air cooler, water treatment mechanism, insulated water tank, filtering mechanism and control cabinet are integrated on the installation platform, and the natural air cooler is mounted on the top of the insulated water tank.

7. An air-cooled, closed-cycle cooling water system according to claim 6, characterized in that: The water treatment mechanism comprises an automatic dosing device and a soft water tank. The automatic dosing device comprises a medicine barrel and a medicine pump located thereon. The pump port of the medicine pump and the valve of the soft water tank are both connected to the thermal insulation water tank.

8. An air-cooled, closed-circulation cooling water system according to claim 7, characterized in that: A waterproof cover is arranged on the top of the medicine barrel to shield it.

9. The air-cooled, closed-loop cooling water system according to claim 1, characterized in that: It also includes a water replenishment mechanism, which includes a water replenishment tank. The water replenishment tank is connected to the insulation water tank through a water replenishment pipeline, and a water pump three, a one-way valve and a soft water tank are sequentially arranged on the water replenishment pipeline.

10. The air-cooled, closed-circulation cooling water system according to claim 1, characterized in that: The first water outlet main pipe and the second water outlet main pipe are respectively provided with a first water pump and a second water pump.

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