CN110736363B - An air-to-air heat exchange device for enhancing water-saving and mist-eliminating of cooling tower - Google Patents
An air-to-air heat exchange device for enhancing water-saving and mist-eliminating of cooling tower Download PDFInfo
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- CN110736363B CN110736363B CN201910797150.2A CN201910797150A CN110736363B CN 110736363 B CN110736363 B CN 110736363B CN 201910797150 A CN201910797150 A CN 201910797150A CN 110736363 B CN110736363 B CN 110736363B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/16—Arrangements for preventing condensation, precipitation or mist formation, outside the cooler
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Abstract
本发明公开了一种强化冷却塔节水消雾的气‑气换热装置，包括多块换热板、多块密封条和两块密封侧板；多块换热板之间平行间隔排列，两块密封侧板固定在所有换热板的两端面；每两块换热板之间的上下两面均通过所述密封条密封形成左右通风的干冷空气通道；两块密封侧板上对应干冷空气通道的位置处分别设置有干冷空气通风槽作为干冷空气的进、出风口；每两块换热板作为一组换热板，相邻两组换热板之间的空间为上下通风的湿热空气通道；由于采用了流向相垂直且交替设置的湿热空气通道与干冷空气通道，利用干冷空气冷却湿热空气的同时，对湿热空气中的水汽进行回收，有效降低了湿热空气的湿度，达到了节水降雾的效果。
The invention discloses an air-to-air heat exchange device for strengthening water-saving and mist-eliminating cooling towers, comprising a plurality of heat exchange plates, a plurality of sealing strips and two sealing side plates; the plurality of heat exchange plates are arranged in parallel and spaced apart, and the two sealing side plates are fixed on the two end surfaces of all the heat exchange plates; the upper and lower surfaces between every two heat exchange plates are sealed by the sealing strips to form a dry and cold air channel for left and right ventilation; dry and cold air ventilation grooves are respectively arranged at positions corresponding to the dry and cold air channels on the two sealing side plates as inlets and outlets for dry and cold air; every two heat exchange plates serve as a group of heat exchange plates, and the space between two adjacent groups of heat exchange plates serves as a humid and hot air channel for up and down ventilation; due to the use of humid and hot air channels and dry and cold air channels with perpendicular flow directions and alternately arranged, the dry and cold air is used to cool the humid and hot air while recovering water vapor in the humid and hot air, thereby effectively reducing the humidity of the humid and hot air and achieving the effect of water saving and mist reduction.
Description
Technical Field
The invention relates to the field of industrial and civil cooling equipment, in particular to a gas-gas heat exchange device for enhancing water conservation and fog dissipation of a cooling tower.
Background
The cooling tower is evaporation cooling equipment, a large amount of heat in high-temperature circulating water is mainly carried away through evaporation of water, the evaporation capacity of the circulating water is large and is about 1.2% -1.6% of the total circulating water in the operation process of the cooling tower, meanwhile, nearly saturated wet hot air is mixed with dry cold air after being discharged out of the cooling tower, and due to the reduction of temperature, water vapor in the wet air is condensed to form white fog outside the tower, so that the environment and the visibility of surrounding areas are influenced, and the environment and the safety are brought, so that the research on water conservation and fog dissipation of the cooling tower has important practical significance.
In the prior art, a method for reducing the temperature of outlet air to condense and separate out water vapor is often adopted for defogging of a cooling tower, for example, the prior patent document CN103727805A discloses a deep condensation defogging environment-friendly device, and a plurality of rows of heat exchange assemblies arranged in a diamond manner in the device are utilized to condense hot and humid air so as to achieve the effect of water saving and defogging, but the heat exchange area of the device is smaller, the flow resistance caused by the diamond arrangement is larger, and particularly in seasons in which white fog is difficult to generate, the heat exchange device is difficult to play a role of water saving.
For another example, the prior patent document CN107560456a discloses a mechanical ventilation cooling tower with a cold condensation liquid defogging function, wherein an air-cooling condensation water receiving device is arranged between a water distribution system and a top exhaust fan, cold air is provided by a drawing and supplying device at the bottom of the tower, and a cooling device is arranged on a path of an air outlet pipe, but because the cold air needs to be conveyed from the bottom of the tower to the water receiving device at the upper part of the tower, a large amount of electric energy is consumed, an additional cooling device is added for cooling the cold air, and the investment is large.
Accordingly, there is a need for improvement and development in the art.
Disclosure of Invention
In order to solve the technical problems, the invention provides the gas-gas heat exchange device for enhancing water conservation and fog dissipation of the cooling tower, which can effectively reduce the humidity of hot and humid air.
Meanwhile, the invention also provides a cooling tower which has the effects of saving water and reducing fog, and extra power consumption is not increased in seasons without defogging.
The technical scheme is that the air-air heat exchange device for enhancing water saving and fog dissipating of the cooling tower comprises a plurality of groups of heat exchange plates, a plurality of sealing strips and two sealing side plates, wherein each two heat exchange plates are used as a group of heat exchange plates, the heat exchange plates are arranged in parallel at intervals, the two sealing side plates are fixed on two end faces of each group of heat exchange plates, the upper face and the lower face between the two heat exchange plates in each group of heat exchange plates are sealed through the sealing strips to form left and right ventilated dry and cold air channels, the positions, corresponding to the dry and cold air channels, of the two sealing side plates are respectively provided with a dry and cold air ventilation groove serving as an air inlet and an air outlet of dry and cold air, and a space between two adjacent groups of heat exchange plates is a wet and hot air channel which ventilates up and down.
The gas-gas heat exchange device for enhancing water saving and fog dissipating of the cooling tower comprises a super-hydrophobic coating arranged on the surface of a heat exchange plate facing the hot humid air channel in each group of heat exchange plates, a plurality of cone-shaped protrusions arranged at intervals on the surface of the heat exchange plate facing the hot humid air channel, and super-hydrophilic coatings arranged on the surfaces of all cone-shaped protrusions.
The gas-gas heat exchange device for enhancing water saving and fog dissipating of the cooling tower comprises conical protrusions on the front and back opposite surfaces of each group of heat exchange plates, wherein the conical protrusions are oppositely and symmetrically arranged in the direction.
The gas-gas heat exchange device for water saving and fog dissipating of the reinforced cooling tower comprises a fluorocarbon resin coating or a nano silicon dioxide coating, and a super hydrophilic coating or a nano titanium dioxide coating.
The water-saving fog-dissipating gas-gas heat exchange device of the reinforced cooling tower comprises conical protrusions, wherein the diameter of each conical protrusion is 2-3 mm, the height of each conical protrusion is 2-3 mm, and the distance between every two adjacent conical protrusions is 2-3 mm.
The gas-gas heat exchange device for water saving and fog dissipating of the reinforced cooling tower comprises an arc-shaped flow guide convex groove which is arranged along the length direction of each group of heat exchange plates, wherein each group of heat exchange plates are arranged on the outer surface of each group of heat exchange plates at intervals of 2-3 rows of conical protrusions.
The gas-gas heat exchange device for water saving and fog dissipating of the reinforced cooling tower comprises a super-hydrophobic coating arranged on the surface of the arc-shaped diversion convex groove, wherein the super-hydrophobic coating is a fluorocarbon resin coating or a nano silicon dioxide coating.
The gas-gas heat exchange device for water saving and fog dissipating of the enhanced cooling tower comprises an arc-shaped flow guiding convex groove, wherein the protruding height of the arc-shaped flow guiding convex groove is 1-2 mm, and the length of the arc-shaped flow guiding convex groove is matched with the length of a heat exchange plate.
The gas-gas heat exchange device for water saving and fog dissipating of the enhanced cooling tower is characterized in that the heat exchange plate is made of copper, aluminum or heat conducting plastic with the thickness of 0.5-1.0 mm into a fold line plate shape, an S-shaped curved surface plate shape or a trapezoid plate shape.
The cooling tower comprises a tower body, a top outlet fan spray device and a heat exchanger, wherein the top outlet fan is arranged at the top of the tower body, the spray device and the heat exchange are both arranged in the tower body, and the heat exchange is positioned between the top outlet fan and the spray device, wherein the heat exchanger is arranged as the gas-gas heat exchange device for enhancing water saving and fog dissipation of the cooling tower.
According to the cooling tower and the air-air heat exchange device thereof, as the hot and humid air channels and the dry and cold air channels which are perpendicular in flow direction and are alternately arranged are adopted, and the hot and humid air is cooled by the dry and cold air, the water vapor in the hot and humid air is recovered, the humidity of the hot and humid air is effectively reduced, the effects of saving water and reducing fog are achieved, and in seasons without defogging, additional power consumption is not increased.
Drawings
FIG. 1 is a schematic view of an embodiment of a gas-gas heat exchange apparatus of the present invention;
FIG. 2 is a schematic view of a partially enlarged structure of an outer surface of one side of a single heat exchange plate used in the gas-gas heat exchange apparatus of the present invention;
FIG. 3 is an enlarged schematic side view of a single heat exchange plate for use in the gas-gas heat exchange apparatus of the present invention;
FIG. 4 is a schematic view showing the internal structure of an embodiment of the cooling tower of the present invention.
Detailed Description
The following detailed description and examples of the invention are presented in conjunction with the drawings, and the described examples are intended to illustrate the invention and not to limit the invention to the specific embodiments.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an air-air heat exchange device of the present invention, where the air-air heat exchange device 300 includes two sealing side plates (310 and 320), multiple groups of heat exchange plates 330 and multiple sealing strips 340, the multiple groups of heat exchange plates 330 are arranged in parallel at intervals, the two sealing side plates (310 and 320) are fixed on two end surfaces of each group of heat exchange plates 330, each two heat exchange plates is used as a group of heat exchange plates 330, and the upper and lower surfaces of the inner space of each heat exchange plate are respectively sealed by the sealing strips 340 to form a dry and cold air channel C ventilating from the left and right end surfaces of each group of heat exchange plates 330, and correspondingly, the positions of the two sealing side plates (310 and 320) corresponding to the dry and cold air channel C are respectively provided with a dry and cold air ventilating slot 311 as an air inlet and an air outlet of dry and cold air, and a space between two adjacent groups of heat exchange plates 330 is a wet and hot air channel H ventilating up and down.
That is, in the air-air heat exchange device 300 of the present invention, the hot and humid air channels H are arranged alternately in the direction perpendicular to the flow direction of the dry and cold air channels C, and preferably, the width of the hot and humid air channels H is twice or more the width of the dry and cold air channels C, so as to further improve the recovery efficiency of the moisture in the hot and humid air.
The gas-gas heat exchange device 300 for enhancing water saving and fog removing of the cooling tower belongs to a wall-type gas-gas plate type heat exchanger, wherein a single group of heat exchange plates 330 are main components, and can be in a shape of a broken line plate or a trapezoid plate besides the wavy curved surface plate shown in fig. 1 so as to intercept tiny drips carried in hot and humid air and reduce the flow resistance of a hot and humid air channel.
Referring to fig. 2 and 3, fig. 2 is a schematic view of a partially enlarged structure of an outer surface of a single heat exchange plate used in the air-air heat exchange device according to the present invention, fig. 3 is a schematic view of a side enlarged structure of a single heat exchange plate used in the air-air heat exchange device according to the present invention, taking a single heat exchange plate 330 with a wavy curved surface as an example, in a preferred embodiment of the air-air heat exchange device 300 according to the present invention, two outer surfaces of the single heat exchange plate 330 face different hot humid air channels H, and a plurality of cone-shaped protrusions 331 are alternately arranged on the surface facing the hot humid air channels H, that is, a plurality of cone-shaped protrusions 331 are alternately arranged on the two outer surfaces of each heat exchange plate 330, the protruding directions of the cone-shaped protrusions 331 are all arranged facing the hot humid air channels H, and the surfaces of all cone-shaped protrusions 331 are all provided with super-hydrophilic coatings for absorbing water droplets in the hot humid air, while the two outer surfaces of each heat exchange plate 330 are provided with super-hydrophobic coatings facing the surfaces of the hot humid air channels H for fast flowing water droplets into the cooling tower, and the heat exchange plate 330 are prevented from affecting the heat exchange effect of the hot humid air channels and the heat exchange plate 330.
According to the surface tension action principle of water, when dry and cold air passes through a dry and cold air channel C and rises and hot and humid air passes through a hot and humid air channel H, heat exchange is carried out through a heat exchange plate 330, water vapor of the hot and humid air is quickly condensed into water drops and increased at a conical bulge 331 provided with a super-hydrophilic coating after being cooled, the water drops slide off from the outer surface of a single group of heat exchange plates 330 under the action of gravity, meanwhile, the conical bulge 331 increases the heat exchange area of each group of heat exchange plates 330, improves the heat exchange efficiency, the conical bulge 331 also enhances the turbulence degree of the hot and humid air on the hot and humid air side (and the hot and humid air side) and increases the convection heat transfer coefficient of each group of heat exchange plates 330, the whole heat exchange process is further enhanced, the process of capturing tiny drips is enhanced, the loss of the tiny drips is reduced, the tiny drips can be greatly reduced by the combination of the cooling air and the condensed water drops at the heat exchange plate 330, and the water vapor is greatly removed from the heat exchange channels, and the water vapor is greatly removed from the water absorption tower, and the water is discharged from the water absorption tower.
In a specific embodiment of the gas-gas heat exchange device 300 for water saving and mist elimination of the enhanced cooling tower of the present invention, specifically, the heat exchange plate 330 may be made of copper, aluminum or heat conducting plastic plate with a thickness of 0.5-1.0 mm into a fold line plate shape, an S-shaped curved plate shape or a trapezoid plate shape.
Specifically, the width of the hot and humid air channel H may be set between 15mm and 20mm, and the width of the single dry and cold air channel C may be set between 5mm and 10mm
Specifically, the super-hydrophilic coating can be a polyacrylic acid coating and a nano titanium dioxide coating, and the super-hydrophobic coating can be a fluorocarbon resin coating and a nano silicon dioxide coating.
Specifically, the diameter of the tapered protrusions 331 is 2-3 mm, the height is 2-3 mm, and the distance between two adjacent tapered protrusions 331 is 2-3 mm.
Preferably, on the outer surface of each group of heat exchange plates 330, each 2-3 rows of cone-shaped protrusions 331 are further provided with an arc-shaped flow guiding convex groove 332, and the arc-shaped flow guiding convex grooves 332 are arranged along the length direction of each group of heat exchange plates 330 so as to collect water drops condensed from the cone-shaped protrusions 331 and reduce the influence of the water drops condensed from the cone-shaped protrusions 331 on the cone-shaped protrusions 331 below, thereby further improving the efficiency of recovering water vapor from the heat exchange plates 330.
Preferably, the surface of the arc-shaped flow guiding convex groove 332 is also provided with a super-hydrophobic coating to accelerate the flow guiding effect on the liquid drops, specifically, the super-hydrophobic coating is a fluorocarbon resin coating or a nano silicon dioxide coating, specifically, the protruding height of the arc-shaped flow guiding convex groove 332 is 1-2 mm, and the length of the arc-shaped flow guiding convex groove is matched with the length of the heat exchange plate 330.
In order to maximize the water vapor recovery rate, it is preferable that the conical protrusions 331 on the front and back outer surfaces of each group of heat exchange plates 330 are disposed in opposite and symmetrical directions, and the shape of each group of heat exchange plates 330 is matched, so that the water vapor in the hot and humid air channel H can be cooled, condensed and condensed to the greatest extent, and the tiny drips in the hot and humid air channel H can be trapped and caught to the greatest extent.
In the first embodiment, the air-air heat exchange device 300 is specifically manufactured by adopting a copper plate with the thickness of 0.5mm to manufacture a wavy heat exchange plate 330 assembly, and manufacturing a conical protrusion 331 and an arc-shaped flow guiding protrusion 332 on the outer surface of the wavy heat exchange plate 330 assembly in advance, wherein the diameter of the conical protrusion 331 is 2mm, the height of the upper conical protrusion 331 is 2mm, the distance between two adjacent conical protrusions 331 is 2mm, the protruding height of the arc-shaped flow guiding protrusion 332 is 1mm, the width of a hot and humid air channel H is 16mm, the width of a dry and cold air channel C is 6mm, the super-hydrophilic coating coated on the surface of the conical protrusion 331 adopts a polyacrylic acid coating, the super-hydrophobic coating coated on the outer surface of each group of heat exchange plates 330 and the inner surface of the arc-shaped flow guiding protrusion 332 is a fluorocarbon resin coating, and the data statistics after experiments show that after the air-air heat exchange device 300 of the first embodiment is used, the water saving rate of circulating water of a cooling tower can reach 15-30%.
In the second embodiment, the air-air heat exchange device 300 is specifically made of an aluminum plate with the thickness of 0.8mm to form a wavy heat exchange plate 330 group, and a conical protrusion 331 and an arc-shaped flow guiding protrusion 332 are formed on the outer surface of the wavy heat exchange plate 330 group in advance, wherein the diameter of the conical protrusion 331 is 3mm, the height of the upper conical protrusion 331 is 3mm, the distance between two adjacent conical protrusions 331 is 3mm, the protruding height of the arc-shaped flow guiding protrusion 332 is 1.5mm, the width of a hot and humid air channel H is 18mm, the width of a dry and cold air channel C is 8mm, the super-hydrophilic coating coated on the surface of the conical protrusion 331 adopts a nano-titanium dioxide coating, the super-hydrophobic coating coated on the outer surface of each group of heat exchange plates 330 and the inner surface of the arc-shaped flow guiding protrusion 332 adopts a nano-silicon dioxide coating, and the data statistics after experiments show that after the air-air heat exchange device 300 of the second embodiment is used, the water saving rate of circulating water of a cooling tower can reach 14-28%.
In addition, in order to improve stability of the heat exchange plate 330 and prevent the heat exchange plate 330 from loosening and shifting during long-term use, it is preferable that a plurality of fixing holes 333 are provided at intervals at both upper and lower edges of the heat exchange plate 330 in fig. 2, and all the heat exchange plates 330 are connected and fixed by a plurality of connecting rods 350 and corresponding nuts (not shown) in fig. 1.
It should be noted that, in a dry season when defogging is not required, the dry and cold air channel C may be closed, and the gas-gas heat exchange device 300 of the present invention may be used as a water collector, but still has the functions of retaining micro drips and condensing water without adding additional energy consumption.
Based on the above-mentioned gas-gas heat exchange device 300 for water saving and mist elimination of the enhanced cooling tower, the present invention further provides a cooling tower, and referring to fig. 4, fig. 4 is a schematic internal structure diagram of an embodiment of the cooling tower of the present invention, the cooling tower 200 of the present invention includes a tower body 210, a top outlet fan 220, a spraying device 230, a heat exchanger 240 and a water pump 250, wherein a space at the bottom of the tower body 210 is used for containing circulating water, the cooled circulating water is fed into a lower-level device through the water pump 250, an air inlet 211 is provided on a side wall at the lower part of the tower body 210, the top outlet fan 220 is installed at the top of the tower body 210, the spraying device 230 and the heat exchanger 240 are both installed inside the tower body 210, the spraying device 230 is located at the upper middle part of the tower body 210, the heat exchanger 240 is located between the top outlet fan 220 and the spraying device 230, and the heat exchanger 240 is the gas-gas heat exchange device 300 in any embodiment.
It should be understood that the foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical solutions of the present invention, and it should be understood that the foregoing may be added, substituted, altered or modified within the spirit and principle of the present invention by those skilled in the art, and all such added, substituted, altered or modified embodiments fall within the scope of the appended claims.
Claims (7)
1. The air-air heat exchange device for enhancing water saving and fog dissipating of the cooling tower is characterized by comprising a plurality of groups of heat exchange plates, a plurality of sealing strips and two sealing side plates, wherein the heat exchange plates are arranged in parallel at intervals, the two sealing side plates are fixed on two end faces of each group of heat exchange plates, each two heat exchange plates are used as a group of heat exchange plates, the upper face and the lower face between the two heat exchange plates in each group of heat exchange plates are sealed by the sealing strips to form left and right ventilated dry and cold air channels, the positions, corresponding to the dry and cold air channels, of the two sealing side plates are respectively provided with a dry and cold air ventilation groove as an air inlet and an air outlet of dry and cold air, and the space between the two adjacent groups of heat exchange plates is a wet and hot air channel which ventilates up and down;
in each group of heat exchange plates, the surfaces of the heat exchange plates facing the hot and humid air channels are provided with super-hydrophobic coatings, and a plurality of cone-shaped protrusions are arranged on the surfaces of the heat exchange plates of the surfaces at intervals, and the cone-shaped protrusions are all arranged facing the hot and humid air channels;
each group of heat exchange plates is provided with an arc-shaped flow guide convex groove on the outer surface at intervals of 2-3 rows of conical protrusions, and the arc-shaped flow guide convex grooves are arranged along the length direction of each group of heat exchange plates;
The surface of the arc-shaped flow guiding convex groove is provided with a super-hydrophobic coating, wherein the super-hydrophobic coating is a fluorocarbon resin coating or a nano silicon dioxide coating;
The heat exchange plate is made into a fold line plate shape, an S-shaped curved surface plate shape or a trapezoid plate shape.
2. The gas-gas heat exchange device for water saving and mist elimination of the enhanced cooling tower according to claim 1, wherein the conical protrusions on the front surface and the back surface of each group of heat exchange plates are oppositely and symmetrically arranged.
3. The gas-gas heat exchange device for water saving and mist elimination of the reinforced cooling tower according to claim 1, wherein the super-hydrophobic coating is a fluorocarbon resin coating or a nano silicon dioxide coating, and the super-hydrophilic coating is a polyacrylic acid coating or a nano titanium dioxide coating.
4. The gas-gas heat exchange device for water saving and mist elimination of the reinforced cooling tower according to claim 1, wherein the diameter of the conical protrusions is 2-3 mm, the height of the conical protrusions is 2-3 mm, and the distance between every two adjacent conical protrusions is 2-3 mm.
5. The gas-gas heat exchange device for water saving and fog dissipating of the enhanced cooling tower according to claim 1, wherein the protruding height of the arc-shaped flow guiding convex groove is 1-2 mm, and the length of the arc-shaped flow guiding convex groove is matched with the length of the heat exchange plate.
6. The gas-gas heat exchange device for water saving and mist elimination of the enhanced cooling tower according to claim 1, wherein the heat exchange plate is made of copper, aluminum or heat conducting plastic with the thickness of 0.5-1.0 mm.
7. A cooling tower comprises a tower body, a top outlet fan spray device and a heat exchanger, wherein the top outlet fan is arranged at the top of the tower body, the spray device and the heat exchange are both arranged in the tower body, and the heat exchange is positioned between the top outlet fan and the spray device.
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| CN115435609A (en) * | 2021-06-03 | 2022-12-06 | 中国石油化工股份有限公司 | Fog dispersal filler unit and water conservation fog dispersal cooling tower |
| WO2025087354A1 (en) * | 2023-10-27 | 2025-05-01 | 中国石油化工股份有限公司 | Cooling tower, and drenching and plume-abatement packing unit and plume-abatement packing unit thereof |
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| CN104406436A (en) * | 2014-11-29 | 2015-03-11 | 新昌县成丰机械配件厂 | Energy-saving plate heat exchanger |
| CN104913679B (en) * | 2015-05-28 | 2017-01-11 | 上海理工大学 | Water collector with fog dispersal and water saving functions and evaporation cooling device |
| US20180145625A1 (en) * | 2016-11-22 | 2018-05-24 | Research Foundation Of The City University Of New York | Hybrid substrate that facilitates dropwise condensation |
| CN107179009A (en) * | 2017-05-31 | 2017-09-19 | 西安交通大学 | A kind of gas-gas heat exchange device for the solidifying water that dispersed fog for cooling tower |
| CN107413117A (en) * | 2017-07-03 | 2017-12-01 | 合肥天翔环境工程有限公司 | A kind of board-like demister |
| CN109724430B (en) * | 2019-01-21 | 2024-02-27 | 华北水利水电大学 | Cooling tower water conservation degree of depth fog dispersal system |
| CN109631611A (en) * | 2019-01-26 | 2019-04-16 | 广州航海学院 | Strengthen the hydrophobic substrate and apparatus and method of condensing heat-exchange |
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