A defogging and water-saving evaporative condenser

Abstract

The present invention discloses a defogging and water-saving evaporative condenser, comprising a shell, a water tank arranged at the bottom of the shell, a heat exchange tube arranged at the middle and upper part of the shell, a spray device arranged just above the heat exchange tube, the spray device is connected to the water tank through a water pump and a pipeline, a packing device arranged just below the spray device, and a fan arranged on the shell; the air intake of the fan is located at the rear side of the heat exchange tube bundle of the shell, and the upper and lower parts of the shell are respectively an upper air inlet and a lower air inlet; a defogging device is arranged at the lower part of the shell and outside the packing device, and the defogging device is connected in series with the heat exchange tube bundle; a partition is arranged at the rear side of the heat exchange tube bundle, and the partition separates the heat exchange tube bundle from the air intake of the fan, and an upper water collector is arranged below the partition. The beneficial effects of the present invention are to reduce the evaporation loss of spray water, reduce the white mist formed by condensation at the fan outlet in winter, reduce the water floating rate of the evaporative condenser, reduce water vapor, and achieve environmental protection and energy saving.

Description

Technical Field

[0001] The invention relates to the technical field of cooling equipment, and in particular to a demisting and water-saving evaporative condenser. Background Art

[0002] The defogging and water-saving evaporative condenser (cooler) is a defogging and water-saving equipment developed by combining the advantages of water vaporization latent heat exchange and air sensible heat exchange. The equipment is used in chemical, electric power, petrochemical, coal chemical, refrigeration, medicine, air conditioning and other processes that require condensation or cooling. It can reduce the evaporation loss of spray water, reduce the floating water rate of the evaporative condenser (cooler), and reduce the white mist of the condensation product when the steam discharged from the fan outlet of the evaporative condenser (cooler) encounters cold in winter.

[0003] During the operation of traditional evaporative condensers (coolers), after the spray water inside the evaporative condenser (cooler) exchanges heat with the heat exchange tube, the water absorbs the heat in the heat exchange tube and evaporates to generate saturated hot and humid air. After the hot and humid air mixes with the cold air, it cools and condenses to form a white mist containing many tiny liquid particle groups. The mist drifts and falls to the surrounding corrosive equipment, causing the surrounding road surface to be slippery and affecting the normal inspection of the staff; the traditional evaporative condenser (cooler) also has the disadvantage of large evaporation loss. With the improvement of environmental protection requirements, water-saving and defogging of defogging and water-saving evaporative condensers (coolers) are becoming more and more important. Summary of the invention

[0004] The present invention provides a demisting and water-saving evaporative condenser, which can reduce the evaporation loss of spray water, reduce the white mist formed by condensation at the fan outlet in winter, reduce the water drift rate of the evaporative condenser (cooler), and reduce the water vapor discharged from the fan outlet of the evaporative condenser (cooler) in winter, thereby achieving environmental protection and energy saving.

[0005] The specific technical solutions provided by the present invention are as follows:

[0006] A demisting and water-saving evaporative condenser comprises a shell, a water tank arranged at the bottom of the shell, a heat exchange tube arranged at the middle and upper part of the shell, a spray device arranged just above the heat exchange tube, the spray device is connected to the water tank through a water pump and a pipeline, a packing device arranged just below the spray device, and a fan arranged on the shell; the air outlet of the fan is located at the rear side of the heat exchange tube bundle of the shell, and the upper and lower parts of the shell are respectively an upper air inlet and a lower air inlet;

[0007] A demisting device is provided at the lower part of the shell and outside the packing device, and the demisting device is connected in series with the heat exchange tube bundle; if the cooling medium is liquid, the demisting device is the cooling medium inlet end; if the cooling medium is gas, the heat exchange tube bundle is the cooling medium inlet end;

[0008] A partition is provided on the rear side of the heat exchange tube bundle, and the partition separates the heat exchange tube bundle from the air intake of the fan. An upper water collector is provided below the partition.

[0009] In this scheme, condensation is mainly achieved by combining the latent heat of vaporization of water with the sensible heat of air; that is, the heat exchange of the spray heat exchange tube bundle and the demisting device are achieved through air heat exchange. The liquid condensed from the gas flows from top to bottom by gravity, so the gas condenses first into the heat exchange tube bundle and then into the demisting device. The liquid in the liquid cooling demisting module flows by water pump pressure, flowing from bottom to top. It can be pre-cooled through the demisting module before entering the heat exchanger, saving water resources, so the liquid cooling medium first enters the demisting module and then enters the heat exchanger.

[0010] Optionally, the partition and the upper water collector separate the air flow channel between the fan exhaust port and the heat exchange tube bundle. Under the action of the fan, the air flow passes through the upper water collector from the heat exchange tube bundle side and is discharged into the atmosphere by the fan.

[0011] Optionally, a lower water collector is arranged obliquely on the inner side of the packing device, and the upper and lower water collectors are connected by a partition; the airflow from the lower air inlet crosses the packing device and is discharged into the atmosphere by the fan after passing through the lower water collector. In this technical solution, large water droplets that fall on the packing device are prevented from being drawn out of the device by the fan suction force, and the large water droplets are collected by the lower water collector.

[0012] Optionally, the heat exchange tube bundle is composed of serpentine coils or straight tubes, and the heat exchange tube bundle is a round tube or a special-shaped tube; the demisting device is a fin tube combination, and the fin tube is a wound fin, a rolled fin or a pierced fin.

[0013] Optionally, the packing device is a PVC packing cooling tower, which is used to cool the spray water.

[0014] The beneficial effects of the present invention are as follows: the latent heat of vaporization of water is combined with the sensible heat of air to reduce the evaporation loss of spray water, reduce the white mist formed by condensation at the fan outlet in winter, reduce the water drift rate of the evaporative condenser (cooler), and reduce the water vapor discharged from the fan outlet of the evaporative condenser (cooler) in winter, thereby achieving true environmental protection and energy saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0017] Figure 2A side structural schematic diagram of an embodiment of the present invention;

[0018] Figure 3 The figure is a schematic diagram of the airflow structure of an embodiment of the present invention.

[0019] In the figure, 1. shell; 2. fan; 3. heat exchange tube bundle; 4. demisting device; 5. spraying device; 6. water tank; 7. water pump; 8. upper water collector; 9. lower water collector; 10. partition; 11. packing device; 12. connecting pipe; 13. upper air inlet; 14. lower air inlet. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] refer to Figure 1-3 As shown, a demisting and water-saving evaporative condenser comprises a shell 1, a water tank 6 arranged at the bottom of the shell 1, and a spray device 5 arranged just above the heat exchange tube bundle 3, wherein the spray device 5 is connected to the water tank 6 through a water pump 7 and a pipeline to realize water recycling; a heat exchange tube bundle 3 is arranged at the upper middle part of the shell 1, a packing device 11 is arranged just below the heat exchange tube bundle 3, and a fan 2 is arranged on the shell 1; the air outlet of the fan 2 is located at the rear side of the heat exchange tube bundle 3 of the shell, and the upper and lower parts of the shell 1 are respectively provided with an upper air inlet 13 and a lower air inlet 14;

[0022] A demisting device 4 is provided at the lower part of the shell and outside the packing device, and the demisting device 4 is connected in series with the heat exchange tube bundle 3 through a connecting pipe 12; if the cooling medium is liquid, the demisting device 4 is the cooling medium inlet end; if the cooling medium is gas, the heat exchange tube bundle 3 is the cooling medium inlet end; a partition 10 is provided on the rear side of the heat exchange tube bundle 3, and the partition 10 separates the heat exchange tube bundle 3 from the air outlet of the fan 2, and an upper water collector 8 is provided below the partition 10.

[0023] The upper and lower water collectors 8 and 9 are connected by a partition 10; the partition 10 and the upper water collector 8 separate the air flow channel between the fan exhaust port and the heat exchange tube bundle. Under the action of the fan, the air flow passes through the upper water collector 8 from the side of the heat exchange tube bundle 3 and is discharged into the atmosphere by the fan.

[0024] A lower water collector 9 is obliquely arranged on the inner side of the filler device 11, and the airflow from the lower air inlet crosses the filler device and passes through the lower water collector 9 before being discharged into the atmosphere by the fan.

[0025] The heat exchange tube bundle 3 is composed of serpentine coils or straight tubes, and the heat exchange tube bundle is a round tube or a special-shaped tube; the demisting device 4 is a fin tube combination, and the fin tube is a wound fin, a rolled fin or a pierced fin; the fin increases the heat exchange area outside the tube to enhance the heat transfer of the air outside the tube.

[0026] The packing device 11 is a PVC packing cooling tower, which is used to cool the spray water; the fan can be designed as a single unit or a combination of multiple units; the spray device 5 consists of a spray pipe and a nozzle; the water tank 6 is used to store the spray water; the water pump 7 is used for the circulation of the spray water, and the shell 1 is made of metal plate or non-metal plate.

[0027] The water pump pressurizes the spray water and sprays it evenly downward on the outside of the heat exchange tube to form a uniform water film. The outside air enters the equipment from the upper air inlet and flows from top to bottom through the fan suction. The water film evaporates and vaporizes continuously, absorbing the heat of the medium in the tube. The air humidity increases greatly and approaches the saturation state, condensing or cooling the medium in the tube. The partition separates the fan and the air flow of the heat exchange tube bundle into a "U"-shaped channel. The fan extracts the saturated wet air and passes it through the upper water collector. After removing the water droplets entrained in the saturated wet air, it is discharged upward from the fan outlet into the atmosphere. This process vaporizes a small amount of water, and most of the water falls back into the water tank and is pressurized by the water pump for recycling. The air exchanges heat with the medium in the demisting device, and the medium in the demisting device is condensed or cooled, bearing 30%-60% of the heat load of the system, and the evaporation load of the evaporation section is reduced by 30%-60% of the evaporated water (the white fog is greatly reduced in winter), the air temperature rises, and the relative humidity of the air decreases; the spray water that is not evaporated after passing through the heat exchange tube bundle falls to the surface of the packing device, and the humidity of the air that passes through the packing horizontally increases, and then passes through the lower water collector on one side of the packing, and the large water droplets are collected and fall into the water tank. The high-temperature humidified air is mixed with the wet air that passes through the heat exchange tube bundle under the suction of the top fan, and is discharged into the atmosphere from the fan outlet.

[0028] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A demisting and water-saving evaporative condenser, comprising a shell, a water tank arranged at the bottom of the shell, a heat exchange tube arranged at the middle and upper part of the shell, a spray device arranged just above the heat exchange tube, the spray device is connected to the water tank through a water pump and a pipeline, a packing device arranged just below the spray device, and a fan arranged on the shell; the air outlet of the fan is located at the rear side of the heat exchange tube bundle of the shell, and the upper and lower parts of the shell are respectively an upper air inlet and a lower air inlet; characterized in that, A demisting device is provided at the lower part of the shell and outside the packing device, and the demisting device is connected in series with the heat exchange tube bundle; if the cooling medium is liquid, the demisting device is the cooling medium inlet end; if the cooling medium is gas, the heat exchange tube bundle is the cooling medium inlet end; A partition is provided at the rear side of the heat exchange tube bundle, the partition separates the heat exchange tube bundle from the air outlet of the fan, and an upper water collector is provided below the partition; The partition and the upper water collector separate the air flow channel between the fan exhaust port and the heat exchange tube bundle. Under the action of the fan, the air flow passes through the upper water collector from the heat exchange tube bundle side and is discharged into the atmosphere by the fan. A lower water collector is obliquely arranged on the inner side of the packing device, and the upper and lower water collectors are connected by a partition plate; the airflow from the lower air inlet crosses the packing device and is discharged into the atmosphere by the fan after passing through the lower water collector.

2. The defogging and water-saving evaporative condenser according to claim 1 is characterized in that: The heat exchange tube bundle is composed of serpentine coils or straight tubes, and the heat exchange tube bundle is a round tube or a special-shaped tube; the demisting device is a fin tube combination, and the fin tube is a wound fin, a rolled fin or a pierced fin.

3. The defogging and water-saving evaporative condenser according to claim 1 is characterized in that: The packing device is a PVC packing cooling tower, which is used to cool the spray water.

4. A fog-eliminating and water-saving evaporative condensation method, characterized in that: Based on the defogging and water-saving evaporative condenser according to any one of claims 1 to 3; the method comprises: The water pump pressurizes the spray water and sprays it evenly on the outside of the heat exchange tube bundle through the spray device. The outside air enters the equipment from the upper air inlet and flows from top to bottom. The water film formed on the outside of the heat exchange tube bundle evaporates continuously, condensing or cooling the medium in the tube; the saturated wet air passes through the upper water collector under the action of the fan and is discharged into the atmosphere from the fan exhaust port. In this process, the water droplets entrained in the saturated wet air are recovered by the upper water collector, and most of the water falls back into the water tank and is recycled after being pressurized by the water pump; The air at the lower air inlet exchanges heat through the medium in the demisting module, the air temperature increases and the relative humidity decreases, the spray water that has not been evaporated after passing through the heat exchange tube bundle falls to the filler device, the air humidity increases after passing through the filler device horizontally, and the large water droplets are collected in the water tank after passing through the lower water collector. The high-temperature and humidified air is mixed with the wet air that has passed through the heat exchange tube bundle under the action of the fan and discharged into the atmosphere from the fan exhaust port.

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