CN110553518A - Bionic water condensing device for cooling tower - Google Patents

Abstract

The invention discloses a bionic water condensing device for a cooling tower, wherein a super-hydrophobic coating is arranged on the outer surface of each group of corrugated plates to serve as a hydrophobic substrate, a plurality of hemispherical bulges are arranged on the super-hydrophobic coating at intervals, and super-hydrophilic coatings are arranged on the surfaces of all the hemispherical bulges; the surface of the hydrophobic substrate between every two rows of hemispherical bulges is provided with a drainage groove, the bottom of each group of corrugated plates is also provided with a water collecting groove, and the inner surfaces of the drainage groove and the water collecting groove are also provided with a super-hydrophobic coating; due to the adoption of the corrugated plate with the bionic nano brown beetle back convex-concave alternating structure and the application of the hydrophilic-hydrophobic coating, the recovery rate of water vapor in hot and humid air is obviously increased, the humidity of outlet gas is effectively reduced, evaporation loss is greatly reduced, and the purposes of condensing water and eliminating fog are achieved; the device has the advantages of low investment cost, simple structure, no extra power consumption, capability of recovering evaporated water and floating drops, better condensed water fog dissipation effect, obvious reduction of white smoke emission, energy conservation and environmental protection.

Description

A biomimetic condensate device for cooling towers

technical field

The invention relates to the field of industrial and civil cooling equipment, in particular to a bionic condensation device for cooling towers.

Background technique

The cooling tower is an important device in the circulating water cooling system, generally divided into open cooling tower and closed cooling tower; compared with the open cooling tower, the high temperature working medium of the closed cooling tower flows in the coil to avoid the working medium It is polluted by spray cooling water and air, so as to ensure the cleanness of the working medium. In addition, due to the heat exchange of the partition wall of the closed cooling tower, the cooling capacity will be smaller than that of the open cooling tower, and the evaporation loss of the working medium will be less than that of the open cooling tower. Therefore, the water recovery potential of the open cooling tower is greater than that of the closed cooling tower.

The cooling water loss in the circulating water cooling system mainly comes from the cooling tower itself, mainly including evaporation loss, wind blowing loss and sewage loss; among them, the evaporation loss is the loss of water evaporated into the air when the circulating cooling water is in direct contact with the air for heat exchange The amount of water, this part of the water loss is about 1.2%~1.6% of the total circulating water; while the wind blowing loss is due to the suction of the air duct, the small water droplets blown out of the tower by the air, and the lost water accounts for about 10% of the circulating water. 0.2%~0.5%; for thermal power plants, evaporation loss and wind blowing loss account for 35%~70% of the total water consumption of thermal power plants, and the water loss is serious; in addition, due to the evaporation of water into the air, the air temperature and humidity rise High, in winter, when the hot and humid air is discharged from the tower and mixed with the cold outside air, it will form a fog group containing many tiny droplet groups, causing the road to freeze and reduce the visibility of the air, which will bring environmental and safety problems. Therefore, recycling cooling towers Less evaporation and wind blown water can not only save water, but also eliminate environmental and safety hazards.

For example, the existing patent document CN107449315A discloses a hyperbolic cooling tower water eliminator, which includes several water collection module groups, and each water collection module group includes several horizontally spaced water collection blades, the water collection blades It is a continuous multi-wave sheet formed by one-time compression molding of aluminum alloy material, and a voltage is applied to the steel wire rope of the adjacent water collection module group, so that static electricity is generated between the water collection blades, forming an electrostatic magnetic field to achieve rapid condensation of water vapor effect; however, this water eliminator requires an additional power supply, and its safety is difficult to guarantee due to the high humidity and temperature at the outlet of the humid air after passing through the cooling tower.

As another example, the existing patent document CN103743289A discloses a cooling tower mist elimination and water collection device, which is composed of a cold air supply system, a condensation system, a mixing bellows, and an air intake adjustment device. The cold air supply system is composed of a refrigerator , refrigeration switch, axial flow fan, variable-diameter air duct, and air collection box. After heat exchange in the cooling tower, the airflow that increases in temperature and humidifies is cooled in the condensing system to achieve the purpose of eliminating fog and collecting water; however, the device requires a large investment , High energy consumption, and the need for multiple systems to coordinate work, there is still a certain distance from the goal of energy conservation and environmental protection.

As another example, the existing patent document CN204987933U discloses a deep condensed water recovery demisting device in a cooling tower, including a condensation module, a louver and an air shield; the hot and humid air in the tower and the dry and cold air outside the tower pass through the condensation module at the same time for heat exchange , the water vapor is condensed into water droplets and then recycled, and the hot and humid air in the tower is mixed with the dry and cold air outside the tower in the upper part of the condensation to reduce the moisture content, so as to achieve the effect of saving water and eliminating fog; however, because it requires an additional fan, and The air resistance of the condensing module is large. When the pressure head is not high, it is easy to cause insufficient air intake. When the design margin of the cooling tower is not large, the cooling efficiency of the cooling tower is affected.

Therefore, the prior art still needs to be improved and developed.

Contents of the invention

In order to solve the above technical problems, the present invention provides a bionic water condensation device for cooling towers, which has a simple structure, does not require additional power consumption, and has a better effect of water condensation and defogging.

At the same time, the invention also provides a cooling tower, which can obviously reduce white smoke emission, and is energy-saving and environment-friendly.

The technical scheme of the present invention is as follows: a bionic water condensation device for cooling tower, which is installed inside the cooling tower, and is located between the top outlet fan and the spray device; the bionic water condensation device includes a fixed bracket and multiple sets of corrugated Each group of corrugated boards is composed of two corrugated boards, and multiple groups of corrugated boards are arranged in parallel and equally spaced inside the frame composed of fixed brackets; the two outer surfaces of each group of corrugated boards are provided with super-hydrophobic coatings as hydrophobic substrates, A plurality of hemispherical protrusions are arranged at intervals on the hydrophobic base, and the surface of all hemispherical protrusions is provided with a super-hydrophilic coating; and the surface of the hydrophobic base between every two rows of hemispherical protrusions is provided with a Drainage grooves, and a water collection groove is also provided at the bottom of each group of corrugated plates, and the inner surfaces of the drainage grooves and water collection grooves are also provided with super-hydrophobic coatings.

The biomimetic condensation device for cooling towers, wherein: three adjacent hemispherical projections are evenly distributed in a triangle shape on the hydrophobic base.

The biomimetic water condensation device for cooling towers, wherein: three adjacent hemispherical protrusions are evenly distributed in a regular triangle on the hydrophobic base.

The biomimetic condensation device for cooling towers, wherein: the diameter of the hemispherical protrusions is 0.5-1.0 mm, and the distance between two adjacent hemispherical protrusions is 0.5-1.5 mm.

The bionic condensation device for cooling towers, wherein: the distance between two corrugated plates in each group of corrugated plates is 5-12 mm, and the distance between two adjacent groups of corrugated plates is 20-40 mm.

The biomimetic water condensation device for cooling towers, wherein: each set of corrugated plates is in the shape of a broken line plate, an S-shaped curved plate or a trapezoidal plate.

The biomimetic condensate device for cooling towers, wherein: each set of corrugated plates is made of copper, aluminum, polyvinyl chloride or polypropylene into a plate shape.

The biomimetic condensation device for cooling towers, wherein: the super-hydrophilic coating is a micro-nano composite coating composed of polyacrylic acid, short straight fluorine chain surfactants and polar hydrophilic groups, or It is a transparent super-hydrophilic titanium dioxide nano-coating.

The biomimetic condensation device for cooling towers, wherein: the superhydrophobic coating is a composite polymer material coating composed of polytetrafluoroethylene and polyphenylene sulfide, or a silicon dioxide nanomaterial coating .

A cooling tower, comprising a tower body, a top outlet fan spraying device and a water eliminator, the top outlet fan is installed on the top of the tower body, the spray device and the water eliminator are installed inside the tower body, and The water eliminator is located between the top outlet fan and the spraying device, wherein: the water eliminator is set as the biomimetic water condensation device for cooling tower described in any one of the above.

A cooling tower and its bionic water condensation device provided by the present invention, due to the use of corrugated plates with alternating convex and concave structures on the back of the bionic nano-cloth desert beetle, combined with the application of hydrophilic and hydrophobic coatings, can significantly increase the recovery of water vapor in hot and humid air High efficiency, effectively reduces the humidity of the outlet gas, greatly reduces the evaporation loss, thereby achieving the purpose of condensation and mist removal; low investment cost, simple structure, no additional power consumption, can recover both evaporated water and floating droplets, condensation The effect of water mist elimination is better, and the emission of white smoke is significantly reduced, which is energy-saving and environmentally friendly.

Description of drawings

Fig. 1 is a schematic diagram of the biomimetic Namib desert beetle of the biomimetic water condensation device of the present invention;

Fig. 2 is the structural representation of the single group of corrugated plates used in the biomimetic condensation device of the present invention;

3 is a schematic diagram of the overall structure of the biomimetic condensation device of the present invention;

Fig. 4 is a schematic view of the internal structure of an embodiment of the cooling tower of the present invention.

Detailed ways

The specific embodiments and examples of the present invention will be described in detail below in conjunction with the accompanying drawings. The described specific embodiments are only used to explain the present invention, and are not intended to limit the specific embodiments of the present invention.

As shown in Figure 1, Figure 1 is a schematic diagram of the biomimetic Namib desert beetle of the biomimetic water condensation device of the present invention. There is a kind of Namib desert beetle in southwestern Africa, and the special concave-convex structure on its back can accelerate the condensation speed of water vapor in hot and humid air , and will not be blown away again by the wind, and because of the special properties of the beetle’s back, its water absorption can be increased by an order of magnitude, so the present invention uses it in the design of cooling towers, and improves the traditional water eliminator For bionic transformation and optimized design, it is especially suitable for water vapor recovery and utilization of cooling towers in power plants and chemical plants.

As shown in Figure 2, Figure 2 is a schematic structural view of a single set of corrugated plates used in the bionic water condensation device of the present invention, taking the single set of corrugated plates 110 in the form of an S-shaped curved plate as an example, the set of corrugated plates 110 consists of two corrugated plates , the outer surfaces of the front and back sides of the group of corrugated plates 110 are all coated with a layer of superhydrophobic coating as a hydrophobic base, and a plurality of hemispherical protrusions 111 are arranged at intervals on the hydrophobic base, and the surfaces of all hemispherical protrusions 111 are Coated with a layer of super-hydrophilic coating; and a drainage groove 112 is provided on the surface of the hydrophobic substrate between every two rows of hemispherical protrusions 111, for example, a through hole or a through groove can be provided at the bottom, and two corrugated The interstitial spaces between the plates are connected, and the protruding directions of the hemispherical protrusions 111 structures on the two corrugated plates in each set of corrugated plates 110 are opposite, and the hydrophilic and hydrophobic structures on the two corrugated plates in each set of corrugated plates 110 The surface is opposite to the direction in which the drainage groove 112 structure is set; The inner surface of the water collection groove 113 is also provided with a super-hydrophobic coating; in each group of corrugated plates 110, for the surfaces of the two corrugated plates towards its internal gap space, a layer of super-hydrophobic coating can also be applied to Good for drainage.

When the hot and humid air flow passes through the hemispherical protrusion 111, the super-hydrophilic coating on its surface can accelerate the condensation of water vapor in the hot and humid air flow, enhance the capture rate of tiny droplets, condense on the surface of the hemispherical protrusion 111 and accumulate water to form beads , and then flow down along the surface of the hemispherical protrusion 111, not only can increase the condensation speed of water vapor, but also can aggravate the disturbance of the updraft due to its special geometric structure, increase the degree of turbulence, and further recover the liquid droplets in the water vapor; And because the growth rate of the surface area of the droplet is much smaller than the volume growth rate, the probability of secondary wind blowing loss can be greatly reduced, so the small droplet formed on the hemispherical protrusion 111 will not be blown up again by the wind; When the hydrophobic substrate between the shaped protrusions 111 is used, because the surface friction of the superhydrophobic coating is very small, it can guide the water droplets, so that the condensed water droplets can quickly flow into the drainage groove 112 to form droplets. At the same time, when the tiny droplets hit the hydrophobic surface, they will be bounced or blown to the hydrophilic area by the wind, thus accelerating the increase in the diameter of the water droplets at the hemispherical protrusion 111, and significantly improving the capture effect of tiny droplets in humid air; The drainage groove 112 is in the shape of an open slope groove, and the superhydrophobic coating on the surface of the drainage groove 112 can accelerate the discharge of droplets, and quickly merge into the water collection groove 113 from the gap space between the two corrugated plates 110 Water flow is formed; the water collection groove 113 is in the shape of a closed curved surface tube, which can not only discharge the condensed water in time, but also prevent the humid air from entering the gap space inside each set of corrugated plates 110 to prevent the liquid droplets from flowing out of the drainage groove 112 The super-hydrophobic coating on the surface of the water collection groove 113 can accelerate the discharge of water flow, and collect the condensed water to the collection pipe on the other side of the cooling tower for subsequent use.

In a preferred embodiment of the corrugated plate used in the biomimetic condensation device of the present invention, specifically, the diameter of the hemispherical protrusions 111 is 0.5-1.0 mm, and the distance between two adjacent hemispherical protrusions 111 is 0.5-1.5 mm. mm; preferably, three adjacent hemispherical protrusions 111 are evenly distributed in a triangle on the hydrophobic base, and the hemispherical protrusions 111 arranged in a triangle can further improve the efficiency of water vapor condensation when the hot and humid air flow passes by, and further aggravate the heat and humidity The degree of turbulence that airflow forms turbulent flow; preferably, three adjacent hemispherical protrusions 111 are equidistributed in a regular triangle on the hydrophobic base, so as to maximize the efficiency of water vapor condensation when the hot and humid airflow passes by, and to maximize the turbulence formed by the hot and humid airflow. The degree of turbulence of the flow.

Preferably, the shape of each group of corrugated plates 110 can be not only S-shaped curved plate, but also broken line plate or trapezoidal plate shape.

Specifically, each group of corrugated plates 110 can be made into a plate shape by using copper, aluminum, polyvinyl chloride or polypropylene material.

Specifically, the super-hydrophilic coating can adopt a micro-nano composite coating composed of polyacrylic acid, a short straight fluorine chain surfactant and a polar hydrophilic group, or a transparent super-hydrophilic titanium dioxide nano-coating .

Specifically, the superhydrophobic coating can be a composite polymer material coating composed of polytetrafluoroethylene and polyphenylene sulfide, or a silicon dioxide nanomaterial coating.

As shown in Figure 3, Figure 3 is a schematic diagram of the overall structure of the bionic water condensation device of the present invention, based on the single set of corrugated plates used in the bionic water condensation device, the bionic water condensation device 100 for cooling towers of the present invention is installed inside the cooling tower , and located between the top outlet fan and the spraying device, the biomimetic water condensation device 100 includes a fixed bracket 120 and multiple sets of corrugated plates 110, and multiple sets of corrugated plates 110 are arranged in parallel and spaced apart and inserted inside the frame composed of the fixed brackets 120.

Preferably, the distance between two corrugated plates in each group of corrugated plates 110 is 5-12 mm, and the distance between two adjacent groups of corrugated plates 110 is between 20 and 40 mm. The efficiency is the highest. Experiments show that after the hot and humid air passes through the bionic water condensation device 100, the humidity is reduced from the original saturated relative humidity to 75%-85%, and becomes an unsaturated gas. Water droplets flow from the device into the water collection groove 113, and It is discharged outside the cooling tower for further use, and the recovery rate for saturated wet and hot droplets can reach more than 95%. If the water eliminator in the prior art is used, it can only recover less than 90% of the saturated wet and hot droplets; Much larger than the evaporated water of floating drops, it is also shown by experiments that the recovery rate of the bionic water condensation device 100 of the present invention can reach 15~25%, so the water saving effect of the bionic water condensation device 100 of the present invention is more obvious; The water condensing device 100 does not require an additional fan, which reduces equipment investment and operating costs, and the biomimetic water condensing device 100 has low investment costs and is more convenient for maintenance and installation.

As shown in FIG. 4, FIG. 4 is a schematic diagram of the internal structure of a cooling tower embodiment of the present invention. Based on the above-mentioned bionic water condensation device 100, the cooling tower 200 of the present invention includes a tower body 210, a top outlet fan 220, a spray device 230, and a cooling tower. Water tank 240 and water pump 250; the space at the bottom of the tower body 210 is used to contain circulating water, and the cooled circulating water is supplied to the lower stage through the water pump 250, and the side wall at the bottom of the tower body 210 is provided There is an air inlet 211, the top outlet fan 220 is installed on the top of the tower body 210, the spray device 230 and the water eliminator 240 are installed inside the tower body 210, and the spray device 230 is located on the tower body 210 The water eliminator 240 is located between the top outlet fan 220 and the spray device 230, and the water eliminator 240 is the biomimetic condensation device 100 in any one of the above-mentioned embodiments.

That is to say, the biomimetic water condensation device 100 of the present invention is a hemispherical protrusion 111 covered with a superhydrophilic coating, and the hydrophobic base between the hemispherical protrusions 111 and the drainage groove 112 and the water collection The grooves 113 are all covered with super-hydrophobic coated corrugated plate water eliminators 240, which are placed between the outlet fan 220 and the spray device 230 at the top of the cooling tower. When the imported cold air exchanges heat and mass with the circulating water, When the warming and humidifying air passes through the super-hydrophilic hemispherical protrusion 111 on the surface of the water eliminator 240, it will condense on its top to form water droplets, and the water droplets will grow rapidly and slide to the hydrophobic surface, and pass through the drainage groove 112 and the collector. The rapid discharge of the water groove 113 can simultaneously increase the water vapor condensation and droplet removal speed in the hot and humid air, thereby significantly reducing the moisture content of the air at the outlet of the cooling tower, and turning the humid air out of the tower into unsaturated humid air.

The biomimetic water condensation device 100 of the present invention can not only increase the collision probability of tiny droplets entrained in hot and humid air and the surface of the water collector 240, but also increase the recovery efficiency of tiny droplets to reduce wind loss, and at the same time, due to its hydrophilic and hydrophobic surface The existence of the material can also increase the condensation rate of water vapor in the air, reduce air humidity, reduce evaporation loss, greatly reduce the probability of forming plume fog, and achieve the purpose of eliminating fog and saving water.

The cooling tower 200 of the present invention does not need to add additional energy consumption and supporting auxiliary equipment, has a simple structure, is convenient for installation and maintenance, and has low cost, and does not affect the outflow of hot and humid air above the filler, which can ensure the cooling effect of the cooling tower and reduce White smoke emission, water saving and energy saving, environmental protection and economy, is an ideal solution for water saving and fog elimination of existing cooling towers.

It should be understood that the above descriptions are only preferred embodiments of the present invention, and are not sufficient to limit the technical solutions of the present invention. For those of ordinary skill in the art, within the spirit and principles of the present invention, they can Additions, substitutions, transformations or improvements are described, and all technical solutions for such additions, substitutions, transformations or improvements shall belong to the scope of protection of the appended claims of the present invention.

Claims (10)

1. A bionic water condensing device for a cooling tower is characterized by being installed inside the cooling tower and located between a top outlet fan and a spraying device; the bionic water condensing device comprises a fixed support and a plurality of groups of corrugated plates, wherein each group of corrugated plates consists of two corrugated plates, and the plurality of groups of corrugated plates are arranged in parallel at equal intervals in a frame consisting of the fixed support; the two outer surfaces of each group of corrugated plates are respectively provided with a super-hydrophobic coating as a hydrophobic substrate, a plurality of hemispherical bulges are arranged on the hydrophobic substrate at intervals, and the surfaces of all the hemispherical bulges are respectively provided with a super-hydrophilic coating; and the surface of the hydrophobic substrate between every two rows of hemispherical bulges is provided with a drainage groove, the bottom of each group of corrugated plates is also provided with a water collecting groove, and the inner surfaces of the drainage groove and the water collecting groove are also provided with super-hydrophobic coatings.

2. The biomimetic water condensation device for a cooling tower according to claim 1, characterized in that: three adjacent hemispherical bulges are uniformly distributed in a triangular shape on the hydrophobic substrate.

3. The biomimetic water condensation device for a cooling tower according to claim 2, characterized in that: three adjacent hemispherical bulges are uniformly distributed on the hydrophobic substrate in a regular triangle shape.

4. The bionic water condensing device for the cooling tower as claimed in claim 1, wherein the diameter of the hemispherical protrusions is 0.5 ~ 1.0.0 mm, and the distance between two adjacent hemispherical protrusions is 0.5 ~ 1.5.5 mm.

5. The bionic water condensing device for the cooling tower of claim 1 is characterized in that the distance between two corrugated plates in each group of corrugated plates is 5-12mm, and the distance between two adjacent groups of corrugated plates is 20 ~ 40 mm.

6. The biomimetic water condensation device for a cooling tower according to claim 1, characterized in that: each group of corrugated plates is in a broken line plate shape, an S-shaped curved surface plate shape or a trapezoid plate shape.

7. The biomimetic water condensation device for a cooling tower according to claim 1, characterized in that: each group of corrugated plates is made of copper, aluminum, polyvinyl chloride or polypropylene materials into a plate shape.

8. The biomimetic water condensation device for a cooling tower according to claim 1, characterized in that: the super-hydrophilic coating is a micro-nano composite coating consisting of polyacrylic acid, a short linear fluorine chain surfactant and a polar hydrophilic group, or a transparent super-hydrophilic titanium dioxide nano coating.

9. The biomimetic water condensation device for a cooling tower according to claim 1, characterized in that: the super-hydrophobic coating is a composite polymer material coating consisting of polytetrafluoroethylene and polyphenylene sulfide, or a silicon dioxide nano material coating.

10. The utility model provides a cooling tower, includes body of the tower, top export fan spray set and receives the hydrophone, the top export fan is installed at the top of body of the tower, spray set and receive the hydrophone and all install the inside at the body of the tower, just receive the hydrophone and be located between top export fan and the spray set, its characterized in that: the water collector is provided with the bionic water condensing device for the cooling tower as claimed in any one of claims 1 to 9.