A dry-wet separation cooler for cooling tower

Abstract

The present invention relates to the technical field of cold end optimization of power generation system, and in particular to a dry-wet separation cooler for cooling tower. Its technical scheme includes: a dry-wet separation cooler for cooling tower, including a partition, a dry guide plate, a wet guide plate, a dry baffle and a wet baffle, wherein the dry guide plate, the wet guide plate, the dry baffle and the wet baffle are located on both sides of the partition, the partition, the dry guide plate and the dry baffle constitute a dry channel for air circulation, an arc-shaped guide plate is provided at the top between the partition and the dry baffle, the partition, the wet guide plate and the wet baffle constitute a wet channel for heat exchange between air and circulating water, and a first mushroom-shaped fin and a second mushroom-shaped fin are provided on both sides of the partition, respectively, and a ventilation hole array is provided at the bottom of the partition, and the ventilation hole array connects the dry channel and the wet channel. The present invention realizes further cooling of circulating water in the cooling tower on the basis of high cooling efficiency and low additional damping.

Description

Technical Field

[0001] The invention relates to the technical field of cold end optimization of power generation systems, and in particular to a dry-wet separation cooler for a cooling tower. Background Art

[0002] With the improvement of my country's industrial level, the demand for cold sources in industrial production and life is also increasing. However, compared with heat sources, efficient and high-quality cold sources are more difficult to obtain. Therefore, the contradiction between people's demand for cold sources and the limitations of cold sources themselves is becoming increasingly fierce, especially in areas such as thermal power generation that have high requirements and large demand for cold sources. Cooling towers are currently commonly used cold source equipment in industry. They are widely used in air conditioning, thermal power generation, metal smelting and other fields. How to reduce the circulating water outlet water temperature and improve the cooling efficiency of cooling towers is the key to optimizing the performance of cooling towers, and it is also the key to alleviating and solving the current contradiction between supply and demand of cold sources.

[0003] At present, the cooling towers of domestic power generation systems are mainly divided into dry cooling towers and wet cooling towers. Among them, the circulating water in the dry cooling tower is not in direct contact with the air, and only the sensible heat of the air is used to cool the circulating water. This cooling tower consumes less water, is not prone to clogging, and has low flow resistance in the tower, but can only cool the circulating water to the dry bulb temperature of the air at the lowest, and the cooling efficiency is low. On the other hand, the circulating water in the wet cooling tower is in direct contact with the air, and the latent heat of evaporation of water is used to cool the circulating water. Compared with the dry cooling tower, the cooling efficiency is higher, but the flow damping is greater, and ideally, the circulating water can only be cooled to the wet bulb temperature of the air. Moreover, in a hot and humid environment, the wet bulb temperature of the air itself is relatively high, resulting in a worse cooling capacity of the wet cooling tower. In order to improve the cooling efficiency of the wet cooling tower, current research mainly focuses on the packing design, packing layout optimization, and air distribution design of the cooling tower. However, these optimization schemes have failed to break through the inherent defects in the wet cooling tower, that is, the circulating water can only be cooled to the wet bulb temperature of the air at most. In recent years, some studies have proposed installing a countercurrent "Maisotsenko cycle" cooling device at the air inlet of a traditional wet cooling tower to improve the cooling performance of the traditional wet cooling tower. It should be noted that although this cooling device can further cool the circulating water to below the wet bulb temperature of the air, most of them have problems such as high additional wind resistance and uneven air distribution in the device, which increases the wind resistance of the cooling tower and reduces the overall cooling efficiency. Therefore, it is urgent to design an innovative cooling system to improve the cooling efficiency of the cooling tower and reduce the outlet temperature of the circulating water of the cooling tower.

[0004] To this end, the present invention combines the triple advantages of low air flow resistance of dry cooling towers, high cooling efficiency of wet cooling towers and the countercurrent "Maisotsenko cycle" that can obtain circulating water with a temperature lower than the wet bulb temperature of the air, and proposes a new type of dry-wet separation cooling device for cooling towers with low damping, high heat transfer efficiency and the ability to cool the circulating water outlet temperature to near the air dew point temperature. Summary of the invention

[0005] The present invention provides a dry-wet separation cooler for a cooling tower, which solves the above-mentioned technical problems.

[0006] The solution of the present invention to solve the above technical problems is as follows:

[0007] A dry-wet separation cooler for a cooling tower comprises a partition, a dry guide plate, a wet guide plate, a dry baffle and a wet baffle, wherein the dry guide plate, the wet guide plate, the dry baffle and the wet baffle are located on both sides of the partition, and the partition, the dry guide plate and the dry baffle constitute a dry channel for air circulation, an arc-shaped guide plate is provided at the top end between the partition and the dry baffle, the partition, the wet guide plate and the wet baffle constitute a wet channel for heat exchange between air and circulating water, and a first mushroom-shaped fin and a second mushroom-shaped fin are respectively provided on both sides of the partition, a ventilation hole array is opened at the bottom of the partition, a guide pipe is installed on the partition at the ventilation hole array, and the ventilation hole array connects the dry channel and the wet channel.

[0008] The beneficial effects of the present invention are as follows: the dry-wet separation design is adopted to break through the bottleneck of the limited outlet temperature of circulating water in traditional dry and wet cooling towers, and the goal of further cooling the circulating water to near the air dew point temperature can be achieved; the first mushroom-shaped fins at the dry channel are arranged in a stepped fence style, and the fin height gradually increases along the air flow direction, which can match the trend of the change in the thickness of the boundary layer, thereby maximally destroying the boundary layer to improve the heat exchange efficiency of the air; the second mushroom-shaped fins at the wet channel are distributed in a herringbone shape, which increases the heat exchange area of ​​the wet channel while guiding the circulating water, avoiding the circulating water from forming an excessively thick liquid film on the partition to block the wet channel, thereby reducing the wet channel. The flow resistance is small, achieving the best match between low flow resistance and high cooling efficiency; moreover, the height of the first mushroom-shaped fin and the second mushroom-shaped fin are respectively one-third to one-tenth of the width of the dry channel and the wet channel, ensuring that the rib efficiency of the fin is in a relatively high range, and a ventilation hole array is arranged at the bottom of the dry channel to directly connect the dry channel and the wet channel, shortening the distance for air to enter the wet channel and reducing the flow resistance along the way, and the stepped and layered layout of the ventilation hole array makes the resistance of each parallel airflow reaching each vent tend to be balanced, so that the air flow flowing into the wet channel is evenly distributed, which significantly improves the disadvantage of uneven air distribution inside the existing cooling device, thereby improving the cooling efficiency of the device.

[0009] Based on the above technical solution, the present invention can also be improved as follows.

[0010] Further, the first mushroom-shaped fin and the second mushroom-shaped fin are respectively located in the dry channel and the wet channel, and the layouts of the first mushroom-shaped fin and the second mushroom-shaped fin are different.

[0011] The beneficial effect of adopting the above further solution is that the first mushroom-shaped fins and the second mushroom-shaped fins can increase the guiding effect on the air and the circulating water through their respective layouts, thereby increasing the heat exchange efficiency.

[0012] Furthermore, the first mushroom-shaped fins are arranged in a stepped fence layout at the upper parts of both sides of the dry channel, and the height of the first mushroom-shaped fins gradually increases along the air flow direction, and the height of the first mushroom-shaped fins is one third to one tenth of the width of the dry channel.

[0013] The beneficial effect of adopting the above further scheme is that the first mushroom-shaped fins are arranged in a stepped fence style, and the fin height gradually increases along the air flow direction, which can match the trend of the change in boundary layer thickness, thereby maximally destroying the boundary layer to improve the heat exchange efficiency of the air.

[0014] Furthermore, the second mushroom-shaped fins are evenly arranged on both sides of the wet channel in a herringbone layout, and the height of the second mushroom-shaped fins is one-third to one-tenth of the width of the wet channel.

[0015] The beneficial effect of adopting the above further scheme is that the second mushroom-shaped fins are distributed in a herringbone shape, which not only increases the heat exchange area of ​​the wet channel, but also plays a guiding role for the circulating water, preventing the circulating water from forming an excessively thick liquid film on the partition and clogging the wet channel, thereby reducing the flow resistance at the wet channel and achieving the best match of low flow resistance and high cooling efficiency.

[0016] Furthermore, the ventilation hole array is arranged in a stepped and layered manner, and the ventilation holes of the ventilation hole array are circular or polygonal in shape.

[0017] The beneficial effect of adopting the above further solution is that the stepped and layered layout of the ventilation hole array makes the resistance of each parallel airflow reaching each ventilation port tend to be balanced, so that the air flow rate flowing into the wet channel is evenly distributed.

[0018] Furthermore, the inner surface of the dry channel is coated with a hygroscopic dry coating.

[0019] The beneficial effect of adopting the above further solution is to ensure that the air is isohumidified and pre-cooled in the dry channel, thereby ensuring the cooling effect of the device.

[0020] Furthermore, the opening rate of the lower part of the ventilation hole array is 20% to 40%, the aperture size is between 20mm and 50mm, the aperture size of the ventilation holes gradually increases along the air flow direction, and the aperture size of the lower ventilation holes is larger than that of the upper ventilation holes.

[0021] The beneficial effect of adopting the above further scheme is: since the aperture of the ventilation hole array gradually increases along the direction of air flow, and the aperture of the lower row is larger than the aperture of the upper row, the resistance of each parallel airflow is balanced, so the air can evenly pass through the ventilation holes and flow to the wet channel.

[0022] Furthermore, the guide tube is located on a side surface of the partition facing the wet channel, and a retaining ring is provided at one end of the guide tube away from the partition.

[0023] The beneficial effect of adopting the above further scheme is: the circulating water is blocked by the guide tube, and the guide tube is trumpet-shaped. When air passes through the guide tube, the diameter of the guide tube shrinks, which increases the air pressure, and then blows out the circulating water entering the guide tube, preventing the circulating water from entering the dry channel through the ventilation hole array. At the same time, the guide tube is cylindrical, which can reduce the flow resistance of the circulating water at the guide tube, and a retaining ring is provided at the edge of the guide tube, which can prevent the circulating water from flowing back along the surface of the guide tube to the inside of the guide tube, further preventing the circulating water from entering the guide tube.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] In the attached picture:

[0027] Figure 1 A three-dimensional stereogram of the present invention;

[0028] Figure 2a A three-dimensional stereogram of part A of the present invention;

[0029] Figure 2b A three-dimensional stereogram of part B of the present invention;

[0030] Figure 3a It is a main plan view of the present invention;

[0031] Figure 3b It is a cross-sectional view of the AB symmetry plane of the present invention;

[0032] Figure 4 It is a three-dimensional stereogram of the superimposed arrangement of the present invention;

[0033] Figure 5 For the present invention Figure 2a A partial enlarged schematic diagram;

[0034] Figure 6 For the present invention Figure 2b A partial enlarged schematic diagram;

[0035] Figure 7 It is a structural schematic diagram of the guide pipe of the present invention.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] Ⅰ. First mushroom-shaped fin; Ⅱ. Second mushroom-shaped fin; 1. Air; 2. Circulating water; 3. Partition; 4. Ventilation hole array; 5. Dry guide plate; 6. Arc-shaped guide plate; 7. Wet guide plate; 8. Dry baffle; 9. Wet baffle; 10. Dry channel; 11. Wet channel; 12. Retaining ring; 13. Guide pipe. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0041] Embodiment 1

[0042] like Figure 1 As shown, the present invention proposes a dry-wet separation cooler for a cooling tower, and this embodiment includes:

[0043] The device should be placed vertically when in use, with the vent array 4 at the bottom and the air 1 inlet at the top. Each device unit consists of two completely symmetrical parts (part A and part B), wherein the dry guide plate 5, dry baffle plate 8 and the baffle plates 3 on both sides constitute a dry channel 10 for the circulation of cooling air 1, and the wet guide plate 7, wet baffle plate 9 and the baffle plates 3 on both sides constitute a wet channel 11 for the heat exchange between the cooling air 1 and the circulating water 2. A guide pipe 13 is installed on the baffle plate 3 at the vent array 4. The guide pipe 13 is located on the side surface of the baffle plate 3 facing the wet channel 11, and a retaining ring 12 is provided at the end of the guide pipe 13 away from the baffle plate 3. The circulating water is ventilated by the guide pipe 13. The guide tube 13 is trumpet-shaped. When the air 1 passes through the guide tube 13, the diameter of the guide tube 13 shrinks, which increases the air pressure, thereby blowing out the circulating water 2 entering the guide tube 13, preventing the circulating water 2 from entering the dry channel 10 through the ventilation hole array 4. At the same time, the guide tube 13 is cylindrical, which can reduce the flow resistance of the circulating water 2 at the guide tube 13, and a retaining ring 12 is provided at the edge of the guide tube 13. The retaining ring 12 can prevent the circulating water 2 from flowing back along the surface of the guide tube 13 to the inside of the guide tube 13, further preventing the circulating water 2 from entering the guide tube 13.

[0044] Embodiment 2

[0045] like Figure 2a As shown, the present invention proposes a dry-wet separation cooler for a cooling tower. Compared with the first embodiment, this embodiment also includes:

[0046] Outside air 1 enters the device from the dry channel 10. In the dry channel 10, the high-temperature air 1 is precooled by the circulating water 2, and the wet-bulb temperature is reduced. Under the restriction of the dry baffle 8, due to the pressure difference, the air 1 can only flow along the dry channel 10 at the top of the device, and finally enter the ventilation hole array 4 at the bottom of the device. The opening rate of the ventilation hole array 4 is 20% to 40%. When the air 1 flows to the ventilation hole array 4, the aperture of the ventilation hole array 4 gradually increases along the direction of the air 1 flow, and the aperture of the lower row is larger than the aperture of the upper row (such as Figure 3a ), so that the resistance of each parallel airflow is balanced, so the air 1 can evenly pass through the ventilation holes to flow to the wet channel 11, and the aperture of the penetration hole should be between 20mm and 50mm. In the dry channel 10, the partition 3 is processed with a first mushroom-shaped fin arranged in a "step fence" style. The height of the first mushroom-shaped fin gradually increases with the flow direction of the air 1, and the height of the first mushroom-shaped fin should be between one-third and one-tenth of the width of the dry channel 10, which plays a role in destroying and thinning the boundary layer (such as Figure 3aIn addition, a dry coating is applied in the dry channel 10 , and the dry baffle 8 prevents water from directly pouring into the dry channel 10 from above, thereby ensuring a moisture-free environment for the dry channel 10 .

[0047] Embodiment 3

[0048] like Figure 2b As shown, the present invention proposes a dry-wet separation cooler for a cooling tower. Compared with the first embodiment, this embodiment also includes:

[0049] The pre-cooled air 1 enters the wet channel 11 through the vent array 4. Driven by the pressure difference, the air 1 flows upward from the downstream, while the circulating water 2 flows downward from the upstream under the gravity. In this way, the circulating water 2 and the pre-cooled air 1 perform evaporative heat exchange in the wet channel 11. The huge evaporative latent heat further cools the cooling water and pre-cools the high-temperature air 1 in the dry channel 10. In the wet channel 11, the partition 3 is processed with a second mushroom-shaped fin arranged in a "human" shape, and the height of the second mushroom-shaped fin should be between one-third and one-tenth of the width of the wet channel 11. This design increases the heat exchange area on the one hand, and guides the circulating water 2 on the other hand, so that the circulating water 2 does not form an excessively thick liquid film on the partition 3 and block the wet channel 11, thereby reducing the resistance of the device, reducing the thermal resistance, and improving the cooling efficiency of the device. The wet baffle 9 prevents the air 1 from directly entering the wet channel 11, ensuring that the air 1 always enters the dry channel 10 first for pre-cooling and then enters the wet channel 11 for evaporative heat exchange.

[0050] Embodiment 4

[0051] like Figure 4 As shown, the present invention proposes a dry-wet separation cooler for a cooling tower. Compared with the first embodiment, this embodiment also includes:

[0052] When in use, they can be closely arranged according to engineering needs, wherein the dry channel 10 and the wet channel 11 are arranged adjacent to each other.

[0053] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A dry-wet separation cooler for a cooling tower, characterized in that: The invention comprises a partition (3), a dry guide plate (5), a wet guide plate (7), a dry baffle (8) and a wet baffle (9), wherein the dry guide plate (5), the wet guide plate (7), the dry baffle (8) and the wet baffle (9) are located on both sides of the partition (3), and the partition (3), the dry guide plate (5) and the dry baffle (8) form a dry channel (10) for the circulation of air (1), and an arc-shaped guide plate (6) is provided at the top end between the partition (3) and the dry baffle (8), and the partition (3) ), a wet guide plate (7) and a wet baffle (9) form a wet channel (11) for heat exchange between air (1) and circulating water (2), and a first mushroom-shaped fin (I) and a second mushroom-shaped fin (II) are respectively provided on both sides of the partition (3), a ventilation hole array (4) is opened at the bottom of the partition (3), and a guide pipe (13) is installed on the partition (3) at the ventilation hole array (4), and the ventilation hole array (4) connects the dry channel (10) and the wet channel (11).

2. A dry-wet separation cooler for a cooling tower according to claim 1, characterized in that: The first mushroom-shaped fin (I) and the second mushroom-shaped fin (II) are respectively located in the dry channel (10) and the wet channel (11), and the layouts of the first mushroom-shaped fin (I) and the second mushroom-shaped fin (II) are different.

3. A dry-wet separation cooler for a cooling tower according to claim 2, characterized in that: The first mushroom-shaped fins (I) are arranged in a stepped fence layout at the upper parts of both sides of the dry channel (10), and the height of the first mushroom-shaped fins (I) gradually increases along the flow direction of the air (1), and the height of the first mushroom-shaped fins (I) is one third to one tenth of the width of the dry channel (10).

4. A dry-wet separation cooler for a cooling tower according to claim 2, characterized in that: The second mushroom-shaped fins (II) are evenly arranged on both sides of the wet channel (11) in a herringbone layout, and the height of the second mushroom-shaped fins (II) is one third to one tenth of the width of the wet channel (11).

5. A dry-wet separation cooler for a cooling tower according to claim 1, characterized in that: The ventilation hole array (4) is arranged in a stepped and layered manner, and the ventilation holes of the ventilation hole array (4) are circular or polygonal in shape.

6. A dry-wet separation cooler for a cooling tower according to claim 1, characterized in that: The inner surface of the dry channel (10) is coated with a hygroscopic dry coating.

7. A dry-wet separation cooler for a cooling tower according to claim 1, characterized in that: The opening rate of the lower part of the ventilation hole array (4) is 20% to 40%, and the aperture size is between 20 mm and 50 mm. The aperture size of the ventilation holes gradually increases along the flow direction of the air (1), and the aperture size of the lower ventilation holes is larger than that of the upper ventilation holes.

8. The dry-wet separation cooler for a cooling tower according to claim 1, characterized in that: The guide tube (13) is located on a side surface of the partition (3) facing the wet channel (11), and a retaining ring (12) is provided at one end of the guide tube (13) facing away from the partition (3).

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