A water-cooled tower water vapor auxiliary recovery device and method

Abstract

This invention provides a water vapor recovery auxiliary device and method for water-cooled towers. The device includes several connectable recovery units and support rods for supporting the recovery units, with each recovery unit corresponding to one support rod. The recovery units are horizontally positioned above the water collector of the water-cooled tower. Each recovery unit has a central node and an even number of radial branches extending outward from the central node. The free ends of any two adjacent radial branches of each recovery unit are respectively provided with screw holes and screws. Adjacent recovery units are joined together by screws and screw holes to form a sheet-like structure covering the area above the water collector. The top end of the support rod is vertically fixed to the middle of the recovery unit, and the bottom end supports the upper part of the water collector. One technical advantage of this invention is its reasonable structure, convenient installation, corrosion resistance, low airflow resistance, and effective improvement in water vapor recovery efficiency.

Description

Technical Field

[0001] This invention belongs to the field of water-saving technology for thermal power plants, and specifically relates to a water-cooled tower water vapor recovery device and method. Background Technology

[0002] Water-cooled towers in thermal power plants are core equipment for cooling exhaust steam from steam turbines. Their working principle involves heat exchange between cooling water and exhaust steam to cool and condense the steam, thereby recycling water resources. However, during the cooling process, the contact between the cooling water and the exhaust steam generates a large amount of water vapor. This water vapor escapes from the water-cooled tower with the rising airflow, resulting in significant water waste.

[0003] In existing technologies, water-cooled towers are usually equipped with water collectors to recover part of the cooling water. However, due to the large flow rate and fast falling speed of the cooling water, a large number of fine droplets are generated during the falling process. These droplets escape with the rising airflow, and the recovery efficiency of conventional water collectors is limited, which cannot effectively solve the problem.

[0004] To improve recovery efficiency, some improvement schemes adopt the addition of multi-layer water collection structures or changes in the shape of water collectors. However, such schemes have drawbacks such as complex structure, difficult installation and maintenance, poor material corrosion resistance, and excessive airflow resistance. Moreover, multi-layer water collection structures will significantly increase the airflow resistance inside the water-cooled tower, affecting the exhaust steam cooling efficiency. At the same time, some metal water collection structures are prone to corrosion and wear in humid environments, resulting in short service life and high maintenance costs. Some schemes are also difficult to apply on a large scale in actual thermal power plant conditions due to their complicated splicing and inability to adapt to water collectors of different sizes.

[0005] Therefore, designing an auxiliary recovery device that is structurally sound, easy to install, corrosion-resistant, has low airflow resistance, and can effectively improve water vapor recovery efficiency has become a key technical challenge in solving the waste of water resources in the water-cooled towers of thermal power plants. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a new technical solution for a water-cooled tower water vapor auxiliary recovery device and method.

[0007] According to a first aspect of the present invention, a water-cooled tower water vapor auxiliary recovery device is provided, comprising a plurality of combinable recovery units and support rods for supporting the recovery units, wherein each recovery unit corresponds one-to-one with a support rod. The recovery units are horizontally arranged above the water collector of the water-cooled tower; each recovery unit has a central node and an even number of radial branches extending outward from the central node. The free ends of any two adjacent radial branches of each recovery unit are respectively provided with screw holes and screws, and adjacent recovery units are joined together by screws and screw holes to form a sheet-like structure covering the area above the water collector. The top end of each support rod is vertically fixed to the middle of the recovery unit, and the bottom end is supported on the upper part of the water collector.

[0008] Through the above structure, the radial branch structure of the recovery unit can effectively disturb the rising water vapor flow field, causing small droplets to collide and aggregate into larger droplets. At the same time, the hollow areas between the radial branches allow the rising airflow to pass smoothly, significantly improving the water vapor recovery efficiency without increasing airflow resistance. The splicing method of screws and screw holes makes the device easy to install, can be adapted to water collectors of different sizes, and each recovery unit can be disassembled and replaced independently, reducing maintenance costs.

[0009] Furthermore, the recycling unit is made of PVC sheet with a thickness of 0.5cm, and is positioned 15cm above the water collector. PVC material has excellent corrosion resistance and lightweight properties; the 0.5cm thickness balances structural strength and overall weight; and the 15cm installation height has been tested and verified to ensure sufficient contact between rising water vapor and the recycling unit.

[0010] Furthermore, each radial branch of the recovery unit has a rounded corner structure at its free end, with a radius of 0.3-0.5 cm. The rounded corner structure reduces airflow resistance and prevents sharp edges from wearing down during installation and use, thus extending the device's service life.

[0011] Furthermore, the surface of the recovery unit is coated with a nano-silica hydrophilic coating with a thickness of 0.02-0.03 cm. The hydrophilic coating enhances the hydrophilicity of the recovery unit surface, allowing small droplets to quickly adhere to the surface and coalesce into larger droplets, accelerating droplet fall and further improving water vapor recovery efficiency.

[0012] Furthermore, the screw is a stainless steel screw, and the inner wall of the screw hole is coated with a polytetrafluoroethylene (PTFE) corrosion-resistant coating. This design effectively prevents the screw and screw hole from rusting and corroding in humid environments, ensuring the connection stability of the spliced ​​structure during long-term use.

[0013] Furthermore, the support rod is made of PVC and is 15cm high. The top of the support rod is fixed to the middle of the recycling unit by hot-melt welding, and the bottom is equipped with a rubber anti-slip pad with a thickness of 0.2-0.3cm. The PVC support rod and the recycling unit are made of the same material to avoid corrosion problems caused by contact between different materials, while also reducing the overall weight of the device. The hot-melt welding connection is firm and not easily loosened. The rubber anti-slip pad increases the friction between the support rod and the surface of the water collector, preventing the device from sliding under airflow.

[0014] Furthermore, each of the recycling units has 6-12 radial branches. The symmetrical distribution of the 6-12 radial branches allows for alternating screw holes and screws at the free ends of adjacent branches of each recycling unit, achieving symmetrical splicing between adjacent recycling units.

[0015] According to a second aspect of the present invention, the present invention also provides a method for auxiliary water vapor recovery in a water-cooled tower, employing the above-mentioned auxiliary water vapor recovery device for a water-cooled tower, comprising the following steps: Step S1: Several recycling units are spliced ​​together by screws and screw holes to form a sheet-like structure covering the area above the water collector; Step S2: Horizontally fix the assembled sheet structure 15cm above the water collector using support rods; When the water-cooled tower is running, the rising water vapor flows through the sheet-like structure. The airflow field is disturbed by the recovery unit, causing the condensed droplets to quickly adhere to the surface of the recovery unit and converge into larger droplets. Under the influence of gravity, the larger droplets slide down the surface of the recovery unit into the water collector. Through this method, efficient water vapor recovery is achieved without increasing airflow resistance.

[0016] Furthermore, before the recycling units are assembled, a nano-silica hydrophilic coating is sprayed onto the surface of the PVC board of the recycling unit. The coating thickness is 0.02-0.03cm to enhance the hydrophilicity of the surface of the recycling unit and accelerate the adhesion and aggregation of droplets.

[0017] Furthermore, each radial branch of the recycling unit has a rounded corner structure at its free end, with a radius of 0.3-0.5 cm, and the splicing gap between adjacent recycling units is no greater than 0.5 cm.

[0018] One technical advantage of this invention is that: In this embodiment, the radial branch structure of the recovery unit effectively disturbs the rising water vapor flow field, causing small droplets to collide and aggregate into larger droplets. At the same time, the hollow areas between the radial branches allow airflow to pass through, significantly improving the water vapor recovery efficiency without increasing airflow resistance, thus solving the problem that existing recovery devices cannot simultaneously achieve recovery efficiency and cooling efficiency.

[0019] Moreover, the device is easy to install and can be adapted to water collectors of different sizes through the detachable splicing method of screws and screw holes. Each recycling unit can be replaced independently, which greatly reduces maintenance costs.

[0020] In addition, the recycling unit and support rod are made of PVC material and have a corrosion-resistant coating. The device is lightweight, corrosion-resistant, and has a long service life, making it suitable for long-term operation in the humid environment of water-cooled towers in thermal power plants. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a water-cooled tower water vapor auxiliary recovery device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the planar structure of a single recovery unit of a water-cooled tower water vapor auxiliary recovery device according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the rounded corner structure and screw hole structure of a water-cooled tower water vapor auxiliary recovery device according to an embodiment of the present invention; Figure 4 This is a side view of a single recycling unit according to an embodiment of the present invention.

[0022] In the diagram: 1. Water cooling tower; 2. Recovery unit; 3. Water collector; 4. Support rod; 5. Rounded corner structure; 6. Screw hole; 7. Anti-slip pad. Detailed Implementation

[0023] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0024] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0025] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example 1 like Figures 1 to 4 As shown in the figure, the present invention provides a water-cooled tower water vapor auxiliary recovery device, which addresses the problems of low water vapor recovery efficiency, serious water waste, complex structure, poor corrosion resistance, high airflow resistance, and inconvenient installation of existing water-cooled towers. It can achieve the technical effects of efficient water vapor recovery, lightweight device, corrosion resistance, convenient installation, and no impact on the cooling efficiency of the water-cooled tower.

[0029] It includes several combinable recycling units 2 and support rods 4 for supporting the recycling units 2, with each recycling unit 2 corresponding to a support rod 4.

[0030] The recovery unit 2 is horizontally positioned above the water collector 3 of the water-cooling tower 1. Each recovery unit 2 has a central node and an even number of radial branches extending outward from the central node. In this embodiment, the recovery unit 2 is hexagonal snowflake-shaped, i.e., it has six radial branches. The hexagonal snowflake-shaped hollow structure can effectively disturb the rising water vapor flow field inside the water-cooling tower 1, break the laminar flow state of the airflow in the local area, and cause the small droplets in the water vapor to collide and aggregate to form larger droplets, thereby accelerating the droplet condensation rate and significantly improving the water vapor recovery efficiency; at the same time, the hollow structure allows the rising airflow to pass smoothly without increasing airflow resistance and without affecting the normal cooling operation of the water-cooling tower 1.

[0031] Each recycling unit 2 has screw holes 6 and screws at the free ends of any two adjacent radial branches. Specifically, in the six hexagonal snowflake-shaped corners, a screw hole 6 is provided on the apex side of every other corner, and screws matching the screw holes 6 are provided on the other three corners. During installation, the screws of adjacent recycling units 2 are aligned with the screw holes 6 and tightened, which quickly allows multiple recycling units 2 to be spliced ​​together to form a sheet-like structure covering the area above the water collector 3. This splicing method is simple and quick, can be adapted to water collectors 3 of different sizes, and the detachable connection method facilitates later maintenance and replacement of individual damaged recycling units 2, reducing maintenance costs.

[0032] The top end of the support rod 4 is vertically fixed to the middle of each recycling unit 2, and the bottom end is supported on the upper part of the water collector 3. The support rod 4 is used to ensure that the sheet-like structure of the recycling unit 2 remains horizontal and to prevent deformation or displacement under the impact of airflow and water vapor.

[0033] The recycling unit 2 is made of PVC sheet with a thickness of 0.5cm. This 0.5cm thickness ensures that the recycling unit 2 will not deform under airflow impact and water vapor, while significantly reducing the overall weight of the device, facilitating transportation and installation. The recycling unit 2 is positioned 15cm above the water collector 3. This height has been verified through multiple tests to ensure sufficient contact between rising water vapor and the recycling unit 2, while also preventing airflow obstruction between the recycling unit 2 and the water collector 3.

[0034] Each radial branch of the recycling unit 2 has a rounded corner structure 5 at its free end, with a radius of 0.3-0.5 cm. In this embodiment, the rounded corner radius is 0.4 cm. The rounded corner structure 5 reduces airflow resistance and prevents sharp edges from wearing down during installation and use, thus extending the device's service life.

[0035] The PVC sheet surface of recycling unit 2 is coated with a nano-silica hydrophilic coating with a thickness of 0.02-0.03 cm. The hydrophilic coating enhances the hydrophilicity of the surface of recycling unit 2, allowing small droplets to quickly adhere to the surface of recycling unit 2 and converge into larger droplets, accelerating the dripping of droplets and further improving the water vapor recovery efficiency.

[0036] The screws are made of stainless steel, and the inner wall of the screw hole 6 is coated with a PTFE corrosion-resistant coating, which can effectively prevent the screw hole 6 and the screw from rusting and corroding in humid environments, ensuring the connection stability of the splicing structure during long-term use.

[0037] The support rod 4 is made of PVC and is 15cm high, matching the distance between the recycling unit 2 and the water collector 3. The top of the support rod 4 is fixed to the middle of the recycling unit 2 via hot-melt welding, ensuring a secure and stable connection. The bottom is equipped with a rubber anti-slip pad 7, 0.2-0.3cm thick, which increases the friction between the support rod 4 and the surface of the water collector 3, preventing slippage under water vapor impact and airflow. The support rod 4 uses the same PVC material as the recycling unit 2 to avoid corrosion problems caused by contact between different materials, while also further reducing the overall weight of the device.

[0038] The gap between adjacent recycling units 2 should not exceed 0.5cm to prevent moisture from escaping through the gap and ensure recycling effect.

[0039] After the water-cooled tower 1 starts working, the exhaust steam from the turbine, after being cooled, generates water vapor that moves upward with the rising airflow. When the airflow passes through the sheet-like structure of the recovery unit 2, the hexagonal snowflake-shaped recovery unit 2 disturbs the airflow field, causing small droplets in the water vapor to collide and aggregate. Under the action of the nano-silica hydrophilic coating, they quickly condense into larger droplets. The larger droplets, after condensation, slide down the surface of the recovery unit 2 under the action of gravity and drip into the water collector 3, completing the water vapor recovery.

[0040] Example 2 like Figures 1 to 4 As shown, this embodiment of the invention also provides a method for auxiliary water vapor recovery in a water-cooled tower, using the water vapor auxiliary recovery device for a water-cooled tower as described in Embodiment 1, including the following steps: Step S1 involves assembling several recycling units 2 together using screws and screw holes 6 to form a sheet-like structure covering the area above the water collector 3. Specifically, the stainless steel screws of adjacent recycling units 2 are aligned with the screw holes 6 and tightened, with a gap of no more than 0.5cm between the joints to prevent moisture from escaping. Before assembly, a nano-silica hydrophilic coating with a thickness of 0.02-0.03cm is sprayed onto the surface of the PVC sheet of the recycling units 2 to enhance the hydrophilicity of the surface of the recycling units 2.

[0041] In step S2, the assembled sheet structure is horizontally fixed 15cm above the water collector 3 using the support rod 4. The top of the support rod 4 is heat-welded to the middle of the recycling unit 2, and the bottom is supported on the upper part of the water collector 3 by the rubber anti-slip pad 7 to ensure that the sheet structure remains horizontal.

[0042] When water-cooled tower 1 is running, rising water vapor flows through the sheet-like structure. The radial branching structure of recovery unit 2 disturbs the airflow field, causing small condensed droplets to quickly adhere to the surface of recovery unit 2 and converge into larger droplets. Under the action of gravity, the larger droplets slide down the surface of recovery unit 2 into the water collector 3, completing the water vapor recovery. Through the above method, efficient water vapor recovery is achieved without increasing the internal airflow resistance of water-cooled tower 1, and without affecting the normal cooling operation of water-cooled tower 1.

[0043] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A water-cooled tower water vapor auxiliary recovery device, characterized in that, It includes several combinable recycling units and support rods for supporting the recycling units, with each recycling unit corresponding to one of the support rods; The recovery unit is horizontally positioned above the water collector of the water-cooling tower; each recovery unit has a central node and an even number of radial branches extending outward from the central node; Each of the two adjacent radial branches of the recycling unit is provided with screw holes and screws at their free ends. The two adjacent recycling units are spliced ​​together by screws and screw holes to form a sheet-like structure covering the area above the water collector. The top end of the support rod is vertically fixed to the middle of the recycling unit, and the bottom end is supported on the upper part of the water collector.

2. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, The recycling unit is made of PVC board with a thickness of 0.5cm, and is located 15cm above the water collector.

3. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, Each radial branch of the recovery unit has a rounded end with a radius of 0.3-0.5 cm.

4. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, The surface of the recycling unit is coated with a nano-silica hydrophilic coating, the thickness of which is 0.02-0.03 cm.

5. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, The screw is a stainless steel screw, and the inner wall of the screw hole is coated with a polytetrafluoroethylene corrosion-resistant coating.

6. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, The support rod is made of PVC and is 15cm high. The top of the support rod is fixed to the middle of the recycling unit by hot-melt welding, and the bottom is provided with a rubber anti-slip pad with a thickness of 0.2-0.3cm.

7. The water-cooled tower water vapor auxiliary recovery device according to claim 1, characterized in that, Each of the aforementioned recycling units has 6-12 radial branches.

8. A method for assisted water vapor recovery in a water-cooled tower, characterized in that, The water-cooled tower water vapor auxiliary recovery device as described in any one of claims 1 to 7 includes the following steps: Step S1: Several recycling units are spliced ​​together by screws and screw holes to form a sheet-like structure covering the area above the water collector; Step S2: Horizontally fix the assembled sheet structure 15cm above the water collector using support rods; When the water-cooled tower is running, the rising water vapor flows through the plate-like structure, disturbing the airflow field through the recovery unit. This causes the condensed small droplets to quickly adhere to the surface of the recovery unit and converge into larger droplets. Larger droplets slide down the surface of the recovery unit into the water collector under the influence of gravity.

9. The water-cooled tower water vapor auxiliary recovery method according to claim 8, characterized in that, Before the recycling units are assembled, a nano-silica hydrophilic coating is sprayed onto the surface of the recycling units, with a coating thickness of 0.02-0.03 cm.

10. The water-cooled tower water vapor assisted recovery method according to claim 8, characterized in that, Each radial branch of the recycling unit has a rounded corner structure at its free end, with a radius of 0.3-0.5cm. The splicing gap between adjacent recycling units is no more than 0.5cm.

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