Cooling tower with water mist recovery function

Abstract

The application provides a cooling tower with water mist recycling function, which comprises a tower body and a fan arranged near a top air outlet of the cooling tower in the tower body, and an air distributor is arranged at the top air outlet of the cooling tower, dry cold air and wet hot steam in the environment can form staggered spatial distribution through the air distributor, and a mixing net capable of mixing the dry cold air and the wet hot steam in the environment is arranged above the top of the cooling tower, the dry cold air and the wet hot steam in the environment form staggered spatial distribution through the pre-action of the air distributor, the two gases which are originally distributed very close are rapidly mixed after flowing through the fan and under the action of the mixing net, condensation is rapid and sufficient, and large proportion of water is recycled.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving and emission reduction, and particularly relates to a cooling tower with water mist recycling function. BACKGROUND

[0002] The working principle of the cooling tower is as follows: the incoming wind and the water falling from above form a convection, and the heat source is removed, and a part of the water evaporates in the convection, and the corresponding latent heat of evaporation is taken away, so as to reduce the temperature of the water. The packed cooling tower uniformly distributes the circulating cooling water needing to be cooled on the packing, and the surrounding cold air is sucked into the tower by the axial flow fan driven by the motor installed on the top of the tower, and the cold air and the hot water perform mass transfer and heat transfer on the surface of the packing to achieve the purpose of reducing the water temperature.

[0003] To improve the heat exchange efficiency of cooling towers, various measures have been adopted in the prior art. For example, invention patent CN102401582 B discloses a cooling tower exhaust port anti-fogging and water collection device, which divides the condenser into left and right parts. Each part consists of at least one set of adjacent hot air channels and return air channels separated by a thin sheet. An atmospheric return channel is located in the middle between the left and right parts of the condenser. The hot and humid airflow discharged from the cooling tower exhaust port is guided by the hot air guide shroud into the relatively cooler air in the hot air channels on the left and right sides of the condenser and the return air channel on the other side of the thin wall for heat exchange. After the temperature is reduced and moisture is precipitated, the airflow is discharged from the left and right ends of the condenser. The essence of this technical solution is heat exchange through the separated thin sheet, which is an indirect heat exchange. It has low heat exchange efficiency, occupies a large space, and is costly. (Announcement number CN 103743289) Patent B discloses a cooling tower defogging and water collection device. This device is installed above the original water collector and below the cooling tower's fan. It consists of a cold air supply system, a condensation system, a mixing air box, and an outlet regulating device. The outlet regulating device is located at the outlet of the condenser's cold air passage. This device comprises a flat sealing plate, a bracket, a hinge shaft, an outlet regulating plate, an adjusting rod, and an adjusting nut. The flat sealing plate is installed below the mixing air box corresponding to the cold air passage outlet. A bracket is mounted on the flat sealing plate, and the upper end of the bracket is connected to an adjustable outlet regulating plate via a hinge shaft. Manual adjustment allows the outlet regulating plate to be either "V"-shaped or flat. When the outlet regulating plate is "V"-shaped, the upper opening of the mixing air box corresponding to the cold air passage outlet is open. When the outlet regulating plate is flat, the upper opening of the mixing air box is closed, and the cold air passage becomes a unidirectional airflow duct. The axial flow fan at one end of the cooling tower then operates in a one-sided air supply and one-sided exhaust mode. The technical solution involves using a low-temperature cold medium for condensation and water recovery. This solution has extremely high operating costs, with the energy expenditure far exceeding the value of the recovered water, making it impractical. Furthermore, invention patent application number 201110461706.4 discloses a water-saving and environmentally friendly cooling tower. It includes an air-mixing condenser inside the tower, with a water collection tank above a water collector at the bottom of the condenser. The air-mixing condenser has an air inlet on its side wall. The air-mixing condenser employs two vertically intersecting airflow channels. Dry, cold air from the outside enters the first channel through the air inlet on the side wall of the air-mixing condenser, while saturated, humid, hot air exiting the packing enters the second channel along the tower wall. The two channels are partially interconnected, and the two gases mix in this interconnected section. In this technical solution, cold air is introduced into the air-mixing condenser inside the cooling tower from the side through louvers. Essentially, this adds another layer of cold-hot air mixing zone inside the cooling tower, causing a portion of the hot air to condense. However, since condensation occurs before the fan, the condensed droplets can damage the fan's high-speed rotating blades.

[0004] Therefore, there is a need for a new type of cooling tower that can improve heat exchange efficiency, recover a large proportion of water mist, extend the service life of the equipment, and reduce investment costs. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a novel cooling tower structure that improves heat exchange efficiency, enables high-proportion water mist recovery, extends equipment lifespan, and reduces investment costs.

[0006] The present invention relates to a cooling tower with water mist recovery function, comprising a tower body and a fan disposed near the air outlet at the top of the cooling tower. The cooling tower is characterized by having an air distributor at the air outlet at the top, through which dry cold air and humid hot water vapor in the environment are arranged in an alternating spatial distribution. Above the top of the cooling tower, a mixing net capable of mixing the dry cold air and humid hot water vapor in the environment is also disposed, the mixing net being located a distance above the air distributor and the fan.

[0007] Furthermore, the air distributor is a staggered air duct arranged below the fan, wherein the hot and cold air ducts of the staggered air duct are arranged alternately.

[0008] Furthermore, the air distributor is a number of small air ducts installed above the fan.

[0009] Furthermore, the fan is a large fan installed below several small air ducts.

[0010] Furthermore, the fan is a plurality of small fans, and each small fan is installed in a small air duct, with the small fans located at the lower part of the small air duct.

[0011] Furthermore, the cooling tower with water mist recovery function also includes a mist eliminator, which is located at the top of the cooling tower.

[0012] Furthermore, the staggered air duct is equipped with a flow regulating disc, which can adjust the cross-sectional size of dry cold air and humid hot water vapor in the environment on the staggered air duct, and can change the flow direction of the airflow to accelerate mixing.

[0013] Furthermore, the flow regulating disc is a disc-shaped assembly, including an inner ring, an outer ring sleeved outside the inner ring, a plurality of fan blades and a fan blade angle adjustment mechanism. The inner ring and the outer ring are connected by a bracket. One end of the fan blade near the center has a shaft extending out and inserting into a hole on the inner ring, and the other end near the outer side has a shaft extending out and inserting into a hole on the outer ring. The angle of the fan blade is adjusted by the angle adjustment mechanism provided on the outer ring.

[0014] Furthermore, the mixing network is arranged in a high-middle and low-sided configuration, and water collection tanks with condensate return pipes are provided on both sides of the mixing network, with the condensate return pipes extending downward along the tower wall of the cooling tower.

[0015] Furthermore, the fog catcher is a wire mesh fog catcher, and the fog catcher is arranged in a form that is high in the middle and low on both sides.

[0016] Furthermore, the air outlet is provided with one or more, and each air outlet corresponds to a wind duct above it.

[0017] Furthermore, when multiple cooling towers are arranged in a group, they can share the roof of one of the mist eliminators.

[0018] Furthermore, the distance between the mixing net and the mist-catching net and the fan is 10cm to 10m.

[0019] Compared with the prior art, the cooling tower with water mist recovery function of the present invention has a pre-acting air distribution duct, which makes the dry cold air and humid hot water vapor in the environment form an alternating spatial distribution, so that condensation is fast and sufficient and a large proportion of water is collected. The condensation occurs after the fan, so the condensate droplets will not collide with the blades and the condensate droplets will not damage the fan blades, so long-term water-saving operation can be achieved.

[0020] The above-mentioned technical features can be combined in various technically feasible ways to produce new implementation schemes, as long as the purpose of the present invention can be achieved. Attached Figure Description

[0021] The invention will now be described in more detail based on embodiments that are merely non-limiting and with reference to the accompanying drawings. Wherein:

[0022] Figure 1 A schematic diagram of Embodiment 1 of the cooling tower with water mist recovery function according to the present invention is shown;

[0023] Figures 2 to 4 Showing Figure 1 A schematic diagram illustrating the working principle of the staggered arrangement of ventilation ducts.

[0024] Figures 5 to 6 The diagram shows the wire mesh demisters arranged horizontally or vertically when multiple cooling towers of the present invention are arranged in a group.

[0025] Figure 7 A schematic diagram of Embodiment 2 of the cooling tower with water mist recovery function according to the present invention is shown;

[0026] Figure 8 A schematic diagram of embodiment 3 of the cooling tower with water mist recovery function according to the present invention is shown;

[0027] Figure 9 A schematic diagram of the flow regulating disc structure in a cooling tower with water mist recovery function according to the present invention is shown.

[0028] In the figures, identical components are labeled with the same reference numerals. The figures are not drawn to scale.

[0029] The attached figures are labeled as follows:

[0030] 1. Tower body; 2. Air distributor; 21. Staggered air ducts; 22. Small air ducts; 3. Flow regulating disc; 4. Fan; 5. Water collection tank; 6. Mixing net; 7. Mist eliminator; 8. Condensate return pipe; 9. Support column; 10. Cooling tower top; 11. Inner ring; 12. Outer ring; 13. Fan blades. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the various embodiments and features in each embodiment of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0032] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. Any parts not described in this invention may be implemented using or by reference to existing techniques.

[0033] Example 1

[0034] like Figure 1 As shown, the cooling tower with water mist recovery function in this embodiment includes a tower body 1 and a fan 4 installed at the top of the tower. An air distributor is installed below the fan 4 and is located at the air outlet of the top 11 of the cooling tower. Dry cold air and humid hot water vapor in the environment are arranged in an alternating spatial distribution through the air distributor 2. A mixing net 6 is installed above the fan 4 to mix the dry cold air and humid hot water vapor in the environment.

[0035] The cooling tower with water mist recovery function of this invention utilizes the pre-action of an air distributor to create an alternating spatial distribution of dry cold air and humid hot water vapor in the environment. After flowing through the fan, under the action of the mixing net, the two gases, which were originally very closely distributed, rapidly mix, undergoing direct gas-to-gas mixing and heat exchange. This causes the water in the humid hot water vapor to condense quickly and completely, achieving a large proportion of water recovery. Furthermore, since condensation occurs after the fan has started, the condensate droplets do not collide with the blades, enabling long-term water-saving operation.

[0036] like Figure 2 , Figure 3 and Figure 4As shown, the air distributor 2 is preferably a staggered air duct 21, with its hot and cold air ducts arranged alternately. Dry cold air and humid hot water vapor in the environment pass through the staggered air duct 21. The cold air passes through the gaps between the fan blades of the air duct, and the humid hot water vapor condenses on the fan blades, thus creating a staggered spatial distribution of cold air and water vapor. Figure 3 As shown, Figure 3 The circle A in the middle represents the opening circle (i.e., air outlet) of the original air duct at the top of the tower (the diameter of the hole is about 1 / 2 of the side length of the tower). Because the pre-arranged arrangement would occupy more space, the staggered arrangement of the air ducts in this invention has a larger diameter than the traditional air ducts. Figure 4 for Figure 3 A magnified view of circle B shows the interlaced spaces formed between the air ducts of the ventilation shaft.

[0037] In an optional embodiment, the cooling tower with water mist recovery function of the present invention further includes a mist eliminator 7, which is located at the top of the cooling tower. Preferably, the mist eliminator 7 is a wire mesh mist eliminator.

[0038] The cooling tower with water mist recovery function of the present invention, through the pre-action of the air distributor, makes the dry cold air and humid hot water vapor in the environment form an alternating spatial distribution. After flowing through the fan and under the action of the mixing net, the two gases that were originally very close to each other quickly mix and carry out direct gas-gas mixing heat exchange, so that the water in the humid hot water vapor condenses rapidly. The condensed mist droplets are collected into large droplets under the action of the mist eliminator 7 (wire mesh mist eliminator) and finally flow back to the water injection pool at the bottom of the cooling tower.

[0039] See you again Figure 2 A flow regulating disc 3 is installed on the staggered air duct. The flow regulating disc 3 can adjust the cross-sectional size of the outside dry cold air and wet hot water steam on the staggered air duct, regulate the distribution of cold and hot air and the total flow. In addition, it can also adjust the airflow angle to create turbulence, which helps to quickly mix dry cold air and wet hot water steam, thereby adjusting the mixing ratio and controlling the cooling tower to work in the required optimal condition.

[0040] like Figure 9As shown, the flow regulating disc 3 is a disc-shaped assembly, including an inner ring 11, an outer ring 12 sleeved outside the inner ring 11, several fan blades 13, and a fan blade angle adjustment mechanism (not shown in the figure). The inner ring 11 and the outer ring 12 are connected by a bracket. One end of the fan blade 12 near the center has a shaft extending out and inserting into a hole on the inner ring 11, and the other end near the outer side has a shaft extending out and inserting into a hole on the outer ring 12. The angle of the fan blade 13 is adjusted by the angle adjustment mechanism provided on the outer ring, thereby changing the angle A between adjacent fan blades 13 to change the flow direction of the airflow and accelerate mixing. Specifically, the angle adjustment mechanism may include a rotating groove, a handle, and a position locking device on the outer ring. This technical means is a conventional technical means for those skilled in the art and will not be described in detail here. The number and installation position of the fan blades 3 correspond to each structural plate of the staggered air duct 21, which can adjust the flow rate and direction of the airflow flowing out of the staggered air duct.

[0041] like Figure 1 The mixing net 6 is arranged in a form that is high in the middle and low on both sides (that is, the part located in the middle of the cooling tower is high, and the parts on both sides of the mixing net that are fixed to the tower body are low). A water collection tank 5 with a condensate return pipe 8 is provided on one side of the mixing net 6.

[0042] The mixing mesh 6 is arranged in a high-middle and low-sided configuration, which facilitates the flow of condensate along the mixing mesh to the water collection tank 5 on one side, and then along the condensate return pipe 8 to the water injection pool at the bottom of the tower. Preferably, the condensate return pipe runs parallel to the tower wall of the cooling tower and extends downward along the tower wall.

[0043] Preferably, the mist eliminator 7 (wire mesh mist eliminator) is also arranged in a form that is higher in the middle and lower on both sides. More preferably, in specific implementations, when multiple cooling towers of the present invention are arranged in a group, a single mist eliminator 7 (wire mesh mist eliminator) can be chosen to share the mist eliminator roof, which is beneficial for recovering more water, such as... Figure 5 and Figure 6 As shown.

[0044] More specifically, the distance between the mixing net and the mist-catching net and the fan is preferably 10cm to 10m.

[0045] In this embodiment, fan 4 is a large fan, i.e., the fan used in existing technology or traditional cooling towers. The fan blades have a large diameter, almost covering the entire packing layer, and the blade diameter is close to the side length of the cooling tower body. The diameter of the staggered air ducts and the large fan ranges from 1m to 20m.

[0046] Example 2

[0047] like Figure 7As shown, based on the technology of Embodiment 1, the cooling tower with water mist recovery function in this embodiment further improves the single air outlet at the top of the cooling tower in Embodiment 1 into several small air outlets. Each air outlet is equipped with a small air duct 22, and each small air duct 22 is equipped with a small fan 4. In this way, the top of the cooling tower forms a pattern of alternating distribution of hot air and ambient cold air. The humid and hot air inside the tower exits upward along the several small air ducts, forming several upward-flowing small hot air streams. The gaps between the hot air streams are filled with ambient cold air, thus forming a pattern of alternating hot and cold distribution, achieving rapid condensation. The water mist forms close to the tower and is recovered through the top mist-catching net, which is conducive to a large proportion of water collection. In this embodiment, the top of the tower serves as both an exhaust port for humid and hot air and an air distribution function.

[0048] The remaining structure is the same as that in Example 1.

[0049] The small air duct 22 is preferably a small air duct with staggered air duct arrangement or a conventional small air duct.

[0050] like Figure 7 In the illustrated embodiment, five small air ducts 22 and five small fans 4 are provided. In other embodiments, the diameter and number of the small air ducts 22 and small fans 4 can be selected according to the diameter or size of the tower.

[0051] Example 3

[0052] like Figure 8 As shown, based on the technology of Embodiment 1 or Embodiment 2, this embodiment of the cooling tower with water mist recovery function has several air outlets at the top of the cooling tower, and each air outlet is equipped with a small air duct. The original large fan 4 remains unchanged and is set below the several small air ducts 22. In this way, the entire top of the tower is transformed into a form where hot air and ambient cold air are distributed alternately. The humid and hot air inside the tower exits the tower along the several small air ducts, forming several upward-flowing small hot air streams. The gaps between the hot air streams are ambient cold air. In this way, the hot and cold air mix quickly, condensation is fast, and water mist is formed at a short distance from the tower and is recovered by the top mist-collecting net, which is conducive to a large proportion of water collection. As shown in the figure below: (the figure shows 5 small air ducts and 1 large fan).

[0053] like Figure 8 In the illustrated embodiment, five small ventilation ducts 22 and one small fan 4 are provided. In other embodiments, the diameter and number of small ventilation ducts can be selected according to the diameter or size of the tower. Preferably, the diameters of the small ventilation ducts and the small fan are between 100 and 5000 mm.

[0054] The remaining structure is the same as in Example 1. The cooling tower with water mist recovery function of this invention, through the pre-action of the air distributor, forms a spatial distribution where the hot, humid air discharged from the cooling tower duct and the ambient cold air are arranged alternately. This allows the cold air and hot, humid air in the environment to mix rapidly and thoroughly, directly exchanging heat and achieving rapid condensation of the hot, humid air. The condensed droplets, under the action of the wire mesh mist trap, converge into large droplets and flow back into the water injection pool of the cooling tower, realizing water recycling and reuse, improving water recovery efficiency. Simultaneously, condensation occurs after the fan, preventing the condensate droplets from colliding with the blades and protecting the fan blades from damage, enabling long-term water-saving operation.

[0055] Therefore, those skilled in the art should recognize that although the present invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0056] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A cooling tower with water mist recovery function, comprising a tower body and a fan disposed near the air outlet at the top of the cooling tower, characterized in that, An air distributor is also installed at the air outlet at the top of the cooling tower. Dry cold air and humid hot water vapor in the environment can form an alternating spatial distribution through the air distributor. A mixing net that can mix the dry cold air and humid hot water vapor in the environment is also installed above the top of the cooling tower. The mixing net is located at a distance above the air distributor and the fan. The air distributor is an interleaved air duct located below the fan, with hot and cold air ducts arranged in an interleaved manner. A flow regulating disc is provided on the interleaved air duct, which can adjust the cross-sectional size of dry cold air and humid hot water vapor in the environment on the interleaved air duct, and can change the flow direction of the airflow to accelerate mixing.

2. The cooling tower with water mist recovery function according to claim 1, characterized in that, The air distributor consists of several small air ducts installed above the fan.

3. The cooling tower with water mist recovery function according to claim 2, characterized in that, The fan is a large fan installed below several small air ducts.

4. The cooling tower with water mist recovery function according to claim 2, characterized in that, The fan consists of several small fans, with one small fan installed inside each small air duct, and the small fans are located at the lower part of the small air duct.

5. The cooling tower with water mist recovery function according to any one of claims 1-4, characterized in that, The cooling tower with water mist recovery function also includes a mist eliminator, which is located above the top of the cooling tower.

6. The cooling tower with water mist recovery function according to any one of claims 1-4, characterized in that, The mixing network is arranged in a high middle and low sides, and water collection tanks with condensate return pipes are provided on both sides of the mixing network. The condensate return pipes extend downward along the tower wall of the cooling tower.

7. The cooling tower with water mist recovery function according to claim 1, characterized in that, The flow regulating disc is a disc-shaped assembly, including an inner ring, an outer ring sleeved outside the inner ring, several fan blades, and a fan blade angle adjustment mechanism. The inner ring and the outer ring are connected by a bracket. One end of the fan blade near the center has a shaft extending out and inserting into a hole on the inner ring, and the other end near the outer side has a shaft extending out and inserting into a hole on the outer ring. The angle of the fan blade is adjusted by the angle adjustment mechanism provided on the outer ring.

8. The cooling tower with water mist recovery function according to claim 5, characterized in that, The fog catcher is a wire mesh fog catcher, which is arranged in a form that is high in the middle and low on both sides.

9. The cooling tower with water mist recovery function according to any one of claims 1-4, characterized in that, The air outlet is provided with one or more, and each air outlet corresponds to a wind duct above it.

10. The cooling tower with water mist recovery function according to claim 8, characterized in that, When multiple cooling towers are arranged in a group, they share the roof of one mist eliminator.

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