Anti-icing pipeline and cooling tower

Abstract

The invention discloses an anti-icing pipeline and a cooling tower, relates to the technical field of cooling towers, and is used for a spraying manifold of the cooling tower. The flow direction adjusting part is provided with a first port, a second port and a third port; the second port is communicated with the first spray head; the third port is communicated with the second spray head; the flow direction adjusting part comprises a jet flow hole used for communicating the first port and the third port to increase the flow speed of fluid, and the opening direction of the jet flow hole faces the third port; the flow direction adjusting part has a first working state and a second working state, in the first working state, the third port is closed, and fluid flows from the first port to the second port; and in the second working state, the third port is opened, the fluid flows from the first port to the third port, and at the jet hole, the flow speed of the fluid is increased, and negative pressure is formed at the second port. Whether fluid is sprayed to the air flow path or not can be stably controlled, and the problem of freezing in the cooling tower caused by valve failure and leakage on the branch pipeline is thoroughly solved.

Description

Technical Field

[0001] This invention relates to the field of cooling tower technology, and more specifically to an anti-icing pipe for a cooling tower and a cooling tower including the anti-icing pipe. Background Technology

[0002] In the field of industrial cooling tower technology, cooling towers typically have the following structure: an air inlet at the bottom of the cooling tower, an air outlet at the top, and a spray manifold and packing layer between the air inlet and the air outlet. The spray manifold is located on the upper side of the packing layer and is equipped with nozzles for spraying hot water onto the packing layer.

[0003] For example, the applicant's earlier Chinese invention patent, authorized by publication number CN113924453B and published on January 11, 2022, discloses a packing sheet, a packing module, and a cooling tower. In its spray section, each nozzle has an independent spray space, and the control switching methods between adjacent nozzles are opposite. Furthermore, the spray spaces of each nozzle are separated from each other by partitions, and the spray spaces are sequentially arranged to form a spray space in the working state and a spray space in the non-working state.

[0004] For example, the applicant's earlier Chinese invention patent, authorized by publication number CN117647149B and published on April 23, 2024, discloses a packing module for a cooling tower. In summer operation, by adjusting the spray section, hot water can be sprayed onto both the air intake space and the spray space, ensuring the cooling tower maximizes heat exchange efficiency without fogging in summer. In winter operation, the hot water to be treated sprayed from the spray section is confined within the spray space and enters the water flow path of the packing module, while another flow path forms an air flow path. Furthermore, the dry hot air flowing through the air flow path and the humid hot air flowing through the water flow path mix in the exhaust layer. This mixture forms unsaturated hot air, which is gradually cooled and degraded after being discharged into the atmosphere through the fan and exhaust vents, resulting in less moisture precipitation and significantly reducing the amount of fog formation.

[0005] To achieve the above-mentioned adjustments to summer and winter operating conditions, special sprinkler water supply pipelines need to be configured. Figure 1 This is a schematic diagram of a spray water supply pipeline used in existing technology for cooling towers. Figure 1 As shown, the main water supply pipe 10 is connected to the air flow valve 11 and the water flow valve 12 respectively.

[0006] Corresponding to the first region 101, the air flow path valve 11 is connected to the first branch pipe 13. The first branch pipe 13 is provided with a plurality of first nozzles 15. The first nozzles 15 are used to spray hot water into the flow path (hereinafter referred to as the air flow path) of the packing layer in the first region 101. Corresponding to the second area 102, the water flow valve 12 is connected to the second branch pipe 14. The second branch pipe 14 is equipped with multiple second nozzles 16, which are used to spray hot water into the flow path (hereinafter referred to as the water flow path) of the packing layer in the second area 102.

[0007] Sprinkler water supply pipelines in actual engineering projects, such as Figure 2 As shown, a main water supply pipe 10 with a large diameter is longitudinally arranged outside the cooling tower. A branch pipe 1001 is connected to the main water supply pipe 10. The first branch pipe 13 and the second branch pipe 14 are respectively connected to the branch pipe 1001. The first branch pipe 13 and the second branch pipe 14 are multiple alternating lines, and correspondingly, the air flow valve 11 and the water flow valve 12 are also multiple alternating lines.

[0008] Figure 3 This illustrates the icing problem caused by the failure of the airflow valve 11 described above. During winter operation, there is no water in the airflow path of the packing module, but water is present in the waterflow path. However, in cold weather, if the airflow valve 11 fails and leaks, the water dripping into the airflow path will be rapidly cooled by the incoming cold air and freeze, forming ice blocks 90 (reference). Figure 3 The volume of ice cubes will increase due to the continuous condensation and accumulation of water droplets, blocking the airflow path, and in severe cases, even causing damage to the packing material or even safety accidents.

[0009] In actual production, due to wear, corrosion, or seal failure, the sealing surface of valves may develop scratches, grooves, or deformation, making effective sealing impossible and valve failure inevitable. Furthermore, cooling towers are large, with their internal structures surrounded by external walls, making it difficult for operators to detect valve failures in the airflow path in a timely manner. Even if valve leaks are detected, replacing them will inevitably disrupt the normal operation of the equipment.

[0010] In summary, it is necessary to study an anti-icing pipeline and cooling tower that has the function of switching between winter and summer working states, and prevents water from entering the air flow path during winter working state. Summary of the Invention

[0011] The present invention provides an anti-icing pipeline and a cooling tower to address the above-mentioned technical problems existing in the prior art. The anti-icing pipeline has a winter working state and a summer working state, and can prevent water from entering the air flow path in the winter working state.

[0012] To achieve the above-mentioned technical objectives, one aspect of the present invention provides an anti-icing pipeline for the spray manifold of a cooling tower. The anti-icing pipeline includes a flow direction adjustment section, which has a first port for fluid inflow and a second port and a third port for selective fluid outflow. The flow direction adjustment section includes a contraction section, a diffusion section, and a jet orifice formed between the contraction section and the diffusion section; The first port is connected to the inlet of the contraction section, and the third port is connected to the outlet of the diffusion section; In the contraction section, the diameter for fluid flow gradually decreases in the direction toward the jet orifice; In the diffusion section, the diameter for fluid flow gradually increases in the direction away from the jet orifice; The flow direction adjustment unit has a first working state and a second working state. In the first working state, the third port is closed, and fluid flows from the first port to the second port; In the second working state, the third port is open, and fluid flows from the first port to the third port, creating a negative pressure at the second port.

[0013] In some possible implementations, the second port is connected to the first nozzle; A pipe is provided between the second port and the first nozzle, extending upward from the second port and then bending downward.

[0014] In some possible implementations, the second port is located above the flow direction adjustment section.

[0015] In some possible implementations, the third port is connected to the second nozzle via a valve.

[0016] In some possible implementations, a throat section is provided between the contraction section and the diffusion section, and the jet orifice is formed within the throat section; The outlet of the contraction section is connected to the inlet of the diffusion section through a jet orifice. The diameter of the jet orifice is smaller than the diameter of the first port; The diameter of the jet orifice is smaller than the diameter of the third port; The second port is connected to the throat segment.

[0017] In some possible implementations, a throat segment is provided between the contraction segment and the diffusion segment, and an inner cavity is formed within the throat segment; The outlet side of the contraction section extends into the inner cavity, and the inner hole gradually decreases, forming the jet hole at the outlet end of the contraction section; The throat section is provided with a throat opposite to the jet hole, the throat is connected to the inlet of the diffuser section, and the inner diameter of the throat is not greater than the inner diameter of the inlet of the diffuser section; The second port is connected to the inner cavity.

[0018] In some possible implementations, the flow direction adjustment part includes a connecting pipe and an outer pipe body; One end of the outer tube forms the first port, and the other end forms the third port; From the first port to the third port, the outer tube body is sequentially provided with the constriction section, the throat section and the diffusion section; The second port is formed at the upper end of the connecting pipe, the lower end of the connecting pipe passes through the side wall of the outer pipe body and enters the interior of the outer pipe body, and extends a section towards the throat segment. A connecting port is formed at the end of the connecting pipe located inside the outer pipe body, opening towards the throat segment. The jet orifice is formed between the connecting port and the throat segment and has an annular structure.

[0019] Another aspect of the present invention provides an anti-icing pipe cooling tower, comprising: Air inlet located at the bottom of the cooling tower; Air outlet located at the top of the cooling tower; A filler layer located between the airflow inlet and the airflow outlet, the filler layer having a first region and a second region spaced apart in the horizontal direction; A spray manifold located on the upper side of the packing layer for spraying fluid onto the packing layer, the spray manifold including any of the above-described anti-icing pipes; wherein, the first nozzle is used to spray fluid onto the first area; and the fluid flowing out of the third port is deviated from the first area.

[0020] In some possible implementations, the fluid flowing out of the third port flows toward the second region.

[0021] In some possible implementations, the first region and the second region are separated by a longitudinal partition.

[0022] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: During summer operation, when hot water needs to be sprayed onto the first area, the valve is closed, and the hot water flows from the branch pipe to the second pipe. After passing through the second pipe, it enters the first port of the flow adjustment unit, flows from the first port to the second port, and is sprayed onto the first area through the first nozzle.

[0023] When it's necessary to stop spraying hot water into the first area during winter operation, open the valve. Hot water flows sequentially through the branch pipe, the second pipe, the flow adjustment unit, and the third pipe, and is sprayed out at the second nozzle. As the hot water flows through the flow adjustment unit, a negative pressure is created at the second port, thus preventing hot water from flowing out of the first nozzle. This prevents water from entering the airflow path during winter operation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a spray water supply pipeline used in existing technology for cooling towers.

[0025] Figure 2 This is a schematic diagram of the structure of a sprinkler water supply pipeline in an actual project.

[0026] Figure 3 Images showing icing issues caused by valve failure.

[0027] Figure 4 This is a schematic diagram of the anti-icing pipeline according to the first embodiment of the present invention.

[0028] Figure 5 This is a perspective view of the anti-icing pipeline according to the first embodiment of the present invention.

[0029] Figure 6 This is a schematic diagram of the flow direction adjustment section in the anti-icing pipeline according to the first embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram showing the location of the operating unit in the anti-icing pipeline according to the first embodiment of the present invention.

[0031] Figure 8 This is a schematic diagram of the connection structure of the valve and the operating unit in the anti-icing pipeline according to the first embodiment of the present invention.

[0032] Figure 9 This is a schematic diagram of a cooling tower according to a first example of the present invention.

[0033] Figure 10 A schematic diagram of a cooling tower according to a second usage example of the present invention.

[0034] Figure 11 This is a schematic diagram of the anti-icing pipeline according to the second embodiment of the present invention.

[0035] Figure 12This is a schematic diagram of the flow direction adjustment section in the anti-icing pipeline according to the second embodiment of the present invention.

[0036] Figure 13 This is a schematic diagram of the anti-icing pipeline according to the third embodiment of the present invention.

[0037] Figure 14 This is a schematic diagram of the flow direction adjustment section in the anti-icing pipeline according to the third embodiment of the present invention.

[0038] Figure 15 This is a schematic diagram of the structure of a cooling tower according to a third usage example of the present invention.

[0039] Figure 16 This is a schematic diagram of the structure of a cooling tower according to the fourth usage example of the present invention.

[0040] Figure 17 This is a schematic diagram of the sprinkler manifold before the old tower was renovated.

[0041] Figure 18 This is a schematic diagram of the modified sprinkler manifold.

[0042] Figure 19 This is an experimental photograph showing the valve in the closed state in the anti-icing pipeline of this invention.

[0043] Figure 20 This is an experimental photograph showing the valve in the anti-icing pipeline of the present invention in the open state.

[0044] Explanation of reference numerals in the attached figures 1, 2, 3, 4, 5, 6, cooling tower; 6' old tower; 101. First zone; 102. Second zone; 103. Air inlet; 104. Packing layer; 105. Spray manifold; 106. Mixing layer; 107. Air outlet; 108. Discharge section; 109. Baffle; 10. Main water supply pipeline; 1001. Branch pipeline; 11. Air flow path valve; 12. Water flow path valve; 13. First branch pipe; 14. Second branch pipe; 15. First nozzle; 16. Second nozzle; 17. Third nozzle; 100, 200, 300, 400, 500, anti-icing piping; 111. Branch pipe; 112. Second pipe; 113. Third pipe; 114. Fourth pipe; 115. Fifth pipe; 130. Valve; 131. Operating unit; 132. Slide rail; 140. Operating unit; 141. Support component; 142. Guide component; 143. Control lever; 144. Connecting pin; 120. Flow direction adjustment section; 121. First port; 122. Second port; 1221. Connecting pipe; 123. Third port; 124. Contraction section; 125. Throat section; 126. Diffusion section; 127. Jet orifice; 220. Flow direction adjustment section; 221. First port; 222. Second port; 2221. Connecting pipe; 223. Third port; 224. Contraction section; 225. Throat section; 2251. Inner cavity; 2252. Conical orifice; 2253. Throat; 226. Diffusion section; 227. Jet orifice; 320. Flow direction adjustment section; 321. First port; 322. Second port; 323. Third port; 3221. Connecting pipe; 3222. Connecting opening; 324. Contraction section; 325. Throat section; 326. Diffusion section; 327. Jet orifice; 340. Outer tube body; 410. Heat pipe; 411. Evaporation section; 412. Condensation section; 510. Finned tube section; 620', Sprinkler manifold before modification; 620', Sprinkler manifold after modification; 621. Main water supply pipeline; 622. Branch pipeline; 623. First branch pipeline; 624. Second branch pipeline; 90. Ice cubes. Detailed Implementation

[0045] Other objects and advantages of the present invention will become clear by explaining the preferred embodiments of the present application below.

[0046] The anti-icing pipeline 100 of the present invention eliminates the air flow path valve 11 and water flow path valve 12 through innovative structural design, thus completely solving the problem of icing in the air flow path or the space under the packing layer caused by the failure of the air flow path valve 11 during winter operation.

[0047] The following provides a detailed description of the anti-icing pipeline 100 and the cooling tower 1 of the present invention.

[0048] Figure 4 This is a schematic diagram of the anti-icing pipeline 100 according to the first embodiment of the present invention. Figure 5 This is a perspective view of the anti-icing pipeline 100 according to the first embodiment of the present invention.

[0049] like Figure 4 As shown, the anti-icing pipeline 100 includes a second pipeline 112, a third pipeline 113, and a flow direction adjustment unit 120. The second pipeline 112 is connected to the branch pipeline 111 and is used to transport fluid (water is used as an example below) to the first area 101.

[0050] The second pipe 112, the flow direction adjustment section 120, and the third pipe 113 are connected sequentially. A first nozzle 15 is installed at the flow direction adjustment section 120. The first nozzle 15 is located in the first region 101 and is used to spray hot water into the airflow path of the packing layer corresponding to the first region 101. Preferably, a fourth pipe 114 is provided between the flow direction adjustment section 120 and the first nozzle 15. One end of the fourth pipe 114 is connected to the flow direction adjustment section 120, extends upward for a certain distance, then bends downward and extends further, with the first nozzle 15 installed at its other end. With the above structure, when the pressure of the fluid in the anti-icing pipe 100 fluctuates, the fluid is prevented from flowing out from the second port 122 and the first nozzle 15 into the airflow path of the packing layer.

[0051] A valve 130 and a second nozzle 16 are installed at the end of the third conduit 113. The second nozzle 16 may be located, for example, in the second region 102. The present invention does not particularly limit the installation position of the valve 130; the valve 130 may be located, for example, in the first region 101 or the second region 102. Preferably, the valve 130 is located in the second region 102. The second nozzle 16 is used to spray hot water into the water flow path corresponding to the packing layer in the second region 102.

[0052] In another embodiment, only valve 130 is installed at the end of the third conduit 113 without installing the second nozzle 16; that is, the second nozzle 16 is not necessary.

[0053]

Flow Adjustment Department 120

[0054] The flow adjustment section 120 has a first port 121, a second port 122 and a third port 123. The first port 121 is located at the left end of the contraction section 124, i.e. the inlet; the second port 122 is connected to the throat section 125; and the third port 123 is located at the right end of the diffusion section 126, i.e. the outlet.

[0055] As can be seen from the above, the inner diameter of the jet orifice 127 is smaller than the orifice diameter of the first port 121, and the inner diameter of the jet orifice 127 is smaller than the orifice diameter of the third port 123, which makes the fluid velocity of the jet orifice 127 larger.

[0056] In the technical solution of the present invention, such as Figures 4-5 As shown, in summer, when hot water needs to be sprayed into the first area 101, valve 130 is closed, and hot water flows from branch pipe 111 to second pipe 112. After flowing through second pipe 112, it enters the first port 121 of flow direction adjustment unit 120, and flows from the first port 121 to the second port 122, and is sprayed into the first area 101 through the first nozzle 15.

[0057] In winter, when it is necessary to stop spraying hot water into the first area 101, valve 130 is opened. Hot water sequentially passes through branch pipe 111, second pipe 112, and jet orifice 127 of flow direction adjustment section 120. After the flow velocity is increased by jet orifice 127, it is injected into diffuser section 126, then flows through third pipe 113, and is sprayed out at second nozzle 16. When the hot water flows through flow direction adjustment section 120, a negative pressure is formed at second port 122. Therefore, no hot water is sprayed out at first nozzle 15.

[0058] Furthermore, under negative pressure, air flows from the first nozzle 15 into the fourth pipe 114 and into the throat section 125 of the flow adjustment section 120, where it mixes with hot water in the diffuser section 126 to form an air-water mixture. After flowing out from the second nozzle 16, the air bubbles in the mixture lose external pressure and burst, forming smaller, more evenly distributed water droplets, thus improving the heat exchange efficiency of the packing material in the second region 102.

[0059] In the spray manifold of the cooling tower, there are multiple anti-icing pipes 100 arranged horizontally as described above.

[0060] Figure 7 This is a schematic diagram showing the position of the operating unit 140 in the anti-icing pipeline 100 according to the first embodiment of the present invention. Figure 8 This is a schematic diagram of the connection structure between valve 130 and operating unit 140 in the anti-icing pipeline 100 according to the first embodiment of the present invention.

[0061] like Figure 7 and Figure 8 As shown, the operation unit 140 includes a support member 141 that extends horizontally and is fixedly disposed therein, and a control rod 143 that is disposed parallel to the support member 141 and supported to be horizontally reciprocating. The control rod 143 is connected to the support member 141 via a guide member 142.

[0062] Valve 130 has an operating part 131, which can be rotated to close or open the valve 130. A groove 132 is provided on the operating part 131, and a control lever 143 is connected to the groove 132 via a connecting pin 144. When the control lever 143 reciprocates along the extension direction of the support member 141, the connecting pin 144 causes the operating part 131 to swing, thereby closing or opening the valve 130.

[0063] Figure 7 Two valves 130 are shown, labeled 130a and 130b for clarity. Valve 130a has an operating part 131a, and valve 130b has an operating part 131b. A control lever 143 is connected to each of the two operating parts 131a. The control lever 143 allows for the simultaneous opening or closing of the two valves 130a and 130b. The operating unit 140 of this invention can control multiple valves 130 to open or close simultaneously.

[0064] At the same time, in order to avoid Figure 7 The free ends of the right sides of each third pipe 113 swing with the control rod 143. In this embodiment, the free ends of each third pipe 113 are fixed by the support member 141, and the support member 141 is fixed to the tower body of the cooling tower.

[0065] It should be noted that there are multiple options for the opening and closing of each valve 130. For example, a pneumatic valve can be used, and the opening or closing of each valve 130 can be controlled by a pneumatic principle; or an electric valve can be used, and the opening or closing of each valve 130 can be controlled by an electrical signal; or the operating part 131 of the valve 130 can be set as a gear, and the opening or closing of each valve can be controlled by a gear and rack structure.

[0066] (Example 1) The cooling tower 1 has an air inlet 103 located on its lower side and an air outlet 107 located on its top. An exhaust section 108 is provided in the air outlet 107, which may be, for example, a fan. The rotation of the fan creates a traction force on the air inside the cooling tower 1, forming an airflow between the air inlet 103 and the air outlet 107.

[0067] like Figure 9 As shown, the cooling tower 1 has a first zone 101 and a second zone 102 arranged alternately in the horizontal direction. A fifth pipe 115 is also provided in the spray manifold 105 corresponding to the second zone 102, and multiple third nozzles 17 are installed on this fifth pipe 115. Hot water is sprayed onto the second zone 102 through the third nozzles 17. Water is sprayed from the third nozzles 17 corresponding to the second zone 102 in both summer and winter.

[0068] The cooling tower 1 is equipped with an anti-icing pipe 100. One end of the anti-icing pipe 100 is connected to a branch pipe 111 in a second zone 102, and the other end passes through the adjacent first zone 101 and enters the next second zone 102. The first nozzle 15 in the anti-icing pipe 100 is located in the first zone 101, while the second nozzle 16 is located in the second zone 102.

[0069] Therefore, combined Figures 7-8 As shown, in summer, when hot water needs to be sprayed into the first area 101, valve 130 is closed, and hot water flows from branch pipe 111 to the first port 121, from the first port 121 to the second port 122, and then through the first nozzle 15 to spray hot water into the first area 101.

[0070] In winter, when it is necessary to stop spraying hot water into the first area 101, valve 130 is opened, and hot water flows sequentially through branch pipe 111 and flow adjustment section 120, and is sprayed out at the second nozzle 16. When the hot water flows through the flow adjustment section 120, a negative pressure is formed at the second port 122, so no hot water is sprayed out at the first nozzle 15.

[0071] In Example 1, the opening and closing of each valve 130 can be controlled by the operating unit 140.

[0072] In Example 1, a mixing layer 106 is provided on the upper side of the spray manifold 105. The mixing layer 106 is used to mix dry air and wet air. The air saturation of the mixed air is reduced, and after being discharged to the outside of the cooling tower 1, the generation of plume is reduced.

[0073] (Usage Example 2) The difference between this Application Example 2 and Application Example 1 is that in Application Example 2, a longitudinally arranged partition 109 is used to separate the first region 101 and the second region 102. Therefore, the packing layer 104 can be a packing module with dual flow paths. That is, the packing layer 104 has stacked air flow paths and water flow paths. The water flow path is used for water spraying from top to bottom, while the air flow path is used for air circulation from bottom to top. The hot water in the water flow path and the air in the air flow path exchange heat through a partition. The upper outlet of the air flow path is located in the first region, and the upper inlet of the water flow path is located in the second region. The above-mentioned packing module with dual flow paths has various options.

[0074] In addition, the anti-icing pipe 100 of the present invention can also be applied to hyperbolic cooling towers, that is, the cooling towers of the present invention include mechanical ventilation cooling towers and naturally passing hyperbolic cooling towers.

[0075]

Anti-icing piping 200

[0076] like Figure 11 and Figure 12 As shown, the flow adjustment section 220 has a contraction section 224, a throat section 225 and a diffuser section 226. The throat section 225 is located between the contraction section 224 and the diffuser section 226, and an inner cavity 2251 is formed inside the throat section 225.

[0077] The left end of the constriction section 224 is the first port 221, and the right end of the constriction section 224 extends into the inner cavity 2251. On the side near the throat section 225, the inner hole of the constriction section 224 gradually decreases and forms a jet hole 227 at the end.

[0078] The throat section 225 has a tapered orifice 2252 whose inner diameter gradually decreases from left to right. The connection between the tapered orifice 2252 and the diffuser section 226 forms a throat 2253, which corresponds to the outlet of the jet orifice 227. A connecting pipe 2221 is provided on the upper side of the throat section 225. The lower end of the connecting pipe 2221 communicates with the inner cavity 2251, and the upper end of the connecting pipe 2221 forms a second port 222.

[0079] The left end of the diffuser section 226 is connected to the throat 2253. The inner diameter of the diffuser section 226 gradually increases from left to right, and a third port 223 is formed at the right end of the diffuser section 226.

[0080] In the anti-icing pipeline 200, similar to the anti-icing pipeline 100, the first port 221 is connected to the branch pipeline 111 through the second pipeline 112, the third port 223 is connected to the third pipeline 113, and the second port 222 can be connected to the fourth pipeline 114, for example.

[0081] In summer operation, valve 130 is closed, and the hot water in branch pipe 111 flows through second pipe 112 and jet hole 227 to connecting pipe 2221, and then through fourth pipe 114 to the first nozzle 15, spraying hot water onto the first area 101.

[0082] In winter operation, opening valve 130 allows hot water in branch pipe 111 to flow through second pipe 112, jet orifice 227, throat section 225, and diffuser section 226 to the second nozzle 16, spraying hot water into the second area 102. This, together with the existing spray pipes in the second area 102, ensures all hot water is sprayed into the second area 102. A negative pressure is created at the second port 222 of the flow adjustment section 220, preventing hot water from spraying out of the first nozzle 15 and avoiding the problem of ice formation in the airflow path or the space under the packing layer during winter operation.

[0083]

Anti-icing piping 300

[0084] like Figure 13 and Figure 14 As shown, the flow adjustment part 320 includes a connecting pipe 3221 and an outer pipe body 340.

[0085] The outer tube 340 is provided with a contraction section 324, a throat section 325, and a diffuser section 326. The left end of the outer tube 340 forms a first port 321, and the right end forms a third port 323. The inner diameter of the contraction section 324 gradually decreases from the first port 321 to the third port 323; the inner diameter of the diffuser section 326 gradually increases from the first port 321 to the third port 323; the throat section 325 is formed between the contraction section 324 and the diffuser section 326.

[0086] The upper end of the connecting pipe 3221 forms a second port 322, and the lower end of the connecting pipe 3221 passes through the side wall of the outer pipe body 340 and enters the interior of the outer pipe body 340, and extends a section towards the throat section 325. A connecting port 3222 is formed at the end of the connecting pipe 3221 located inside the outer pipe body 340, which opens towards the throat section 325.

[0087] In the flow direction adjustment section 320 of this embodiment, a jet orifice 327 is formed between the connecting port 3222 and the throat section 325, and has an annular structure. The diameter of the jet orifice 327 (i.e., the cross-sectional area of ​​the annulus) is smaller than the inner diameter of the first port 321, and the aperture of the jet orifice 327 is smaller than the inner diameter of the third port 323.

[0088] In the anti-icing pipeline 300, similar to the anti-icing pipeline 100, the first port 321 is connected to the branch pipeline 111 through the second pipeline 112; the second port 322 is connected to the first nozzle 15 through the fourth pipeline 114; and the third port 323 is connected to the second nozzle 16 through the third pipeline 113 and the valve 130.

[0089] In summer operation, valve 130 is closed, and the hot water in branch pipe 111 flows through second pipe 112, connecting port 3222, and connecting pipe 3221 to second port 322, and then through fourth pipe 114 to the first nozzle 15, spraying hot water onto the first area 101.

[0090] In winter operation, when valve 130 is opened, hot water in branch pipe 111 flows through second pipe 112, first port 321, and into outer pipe body 340. It then flows sequentially through contraction section 324, throat section 325, and diffuser section 326 to the second nozzle 16, spraying hot water into the second area 102. In this way, together with the existing spray pipes in the second area 102, all the hot water is sprayed into the second area 102. A negative pressure is created at the second port 322 of the flow adjustment section 320, preventing hot water from spraying out of the first nozzle 15 and avoiding icing problems in the airflow path and the space under the packing layer during winter operation.

[0091] Cooling Tower 3 The cooling tower 3 of this embodiment includes an anti-icing pipe 400, which is a further improvement on the anti-icing pipe 100 by adding a heat pipe 410. The heat pipe 410 has an evaporation section 411 and a condensation section 412. The heat pipe 410 passes through the partition 109 between the first region 101 and the second region 102. The evaporation section 411 is located in the second region 102 and is located below the second nozzle 16. The condensation section 412 is located in the first region 101.

[0092] In winter operation, valve 130 is opened, and hot water is sprayed from the second nozzle 16 onto the evaporation section 411 of the heat pipe 410, heating the evaporation section 411. The liquid working fluid inside the evaporation section 411 vaporizes and absorbs heat. The vaporized working fluid diffuses along the vacuum channel inside the heat pipe towards the condensation section 412, which has a lower temperature and lower pressure. Upon reaching the condensation section 412, it is cooled by the cold air in the first region 101, releasing the latent heat of phase change and rapidly condensing into a liquid working fluid, which then flows back to the evaporation section 411.

[0093] In this embodiment, heat is transferred between the cold air in the first region 101 and the hot water sprayed onto the heat pipe 410 by the second nozzle 16 in the second region 102. This heat is transferred in a way that the hot water and the air do not come into direct contact, thus reducing the amount of hot water evaporation and achieving the effects of water saving and defogging.

[0094] Preferably, the height of the condensing section 412 of the heat pipe 410 is higher than the height of its evaporating section 411, which is conducive to the flow of gaseous working fluid to the condensing section 412 and the return of liquid working fluid to the evaporating section 411 under the action of gravity.

[0095] Cooling Tower 4 The cooling tower 4 in this embodiment includes an anti-icing pipe 500, which is a further improvement on the anti-icing pipe 100 by adding a finned tube section 510. Specifically, the inlet end of the third pipe 113 is connected to the third port 123 of the flow direction adjustment unit 120, the outlet end of the third pipe 113 is connected to the finned tube section 510, and the finned tube section 510 is connected to the valve 130.

[0096] In this embodiment, at least a portion of the finned tube section 510 is located within the first region 101. During winter operation, hot water flows from the third pipe 113 through the finned tube section 510 to the valve 130, and then is sprayed out from the second nozzle 16. The cold air within the first region 101 exchanges heat with the hot water within the finned tube section 510, thus achieving water-saving and defogging effects.

[0097] (Usage Example 3) In some applications, it is necessary to convert old cooling towers (traditional cooling towers with single-flow-path packing) into the aforementioned cooling towers capable of switching between winter and summer operating modes, thus enabling them to have water-saving and defogging functions. However, the old towers do not have these features. Figure 1 and Figure 2 The spray water supply pipeline shown in the diagram, which can split into two flow paths, requires expensive demolition and reconstruction of the original spray pipeline, making it uneconomical. How to upgrade and renovate the aforementioned old tower while minimizing renovation costs has become a technical problem that needs to be solved by those skilled in the art.

[0098] Figure 17 A schematic diagram of the spray manifold of the old tower is shown. Figure 18 This is a schematic diagram of a spray manifold modified using the anti-icing pipe 100 of the present invention.

[0099] like Figure 17 As shown, the pre-modification spray manifold 620' in the old tower has a main water supply pipe 621, which generally extends longitudinally, with its upper end bending towards the side where the cooling tower 6' is located, and extending through the side wall of the cooling tower 6' into the interior of the cooling tower 6'. Inside the cooling tower 6', a horizontally extending branch pipe 622 is provided, which connects to the upper end of the main water supply pipe 621. The extension direction of the branch pipe 622 is perpendicular to the air intake direction. The branch pipe 622 connects to multiple first branch pipes 623 and second branch pipes 624, which are alternately arranged. Sprinklers are installed on the first branch pipes 623 and second branch pipes 624.

[0100] When modifying the anti-icing pipeline 100 of the present invention, the main water supply pipeline 621, the branch pipeline 622 and the first branch pipeline 623 can be retained, while the second branch pipeline 624 can be removed. Figure 17 (As shown by the dashed line). The modified sprinkler manifold 620 is as follows. Figure 18 As shown, the first branch pipe 623 is retained (utilizing it as branch pipe 111 in the anti-icing pipe 100), and the second pipe 112 in the anti-icing pipe 100 is connected to the first branch pipe 623 in a second area 102. The anti-icing pipe 100 passes through the adjacent first area 101 and enters the next second area 102. The first nozzle 15 is located above the first area 101, and the second nozzle 16 is located above the second area 102. This is in contrast to a complete demolition and reconstruction approach (such as...). Figure 1 , Figure 2 (As shown) Costs are significantly reduced.

[0101] In other embodiments, the first branch pipe 623 and the second branch pipe 624 can be removed as needed, while the main water supply pipe 621 and the diversion pipe 622 are retained, and a new branch pipe 111 can be built as needed, which can also reduce the renovation cost.

[0102] [Experimental Verification] Figure 19 In the anti-icing pipeline 100 of the present invention, valve 130 is closed, the first nozzle 15 sprays water while the second nozzle 16 does not spray water, and the cooling tower 1 is in summer operation mode. Figure 20 In this invention, the valve 130 of the anti-icing pipeline 100 is in the open state, the first nozzle 15 does not spray water while the second nozzle 16 sprays water, and the cooling tower 1 is in winter working state.

[0103] The anti-icing piping system and cooling tower of this application have been described in detail with reference to the preferred technical solutions. However, it should be noted that, without departing from the spirit of this application, those skilled in the art can make any modifications, alterations, and variations based on the above disclosure. This application includes the above-described specific embodiments and any equivalent forms.

Claims

1. Anti-icing piping, used for spray manifolds in cooling towers, characterized in that, The anti-icing pipeline includes a flow direction adjustment section, which has a first port for fluid inflow and a second port and a third port for selective fluid outflow. The flow direction adjustment section includes a contraction section, a diffusion section, and a jet orifice formed between the contraction section and the diffusion section; The first port is connected to the inlet of the contraction section, and the third port is connected to the outlet of the diffusion section; In the contraction section, the diameter for fluid flow gradually decreases in the direction toward the jet orifice; In the diffusion section, the diameter for fluid flow gradually increases in the direction away from the jet orifice; The flow direction adjustment unit has a first working state and a second working state. In the first working state, the third port is closed, and fluid flows from the first port to the second port; In the second working state, the third port is open, and fluid flows from the first port to the third port, creating a negative pressure at the second port.

2. The anti-icing pipeline as described in claim 1, characterized in that, The second port is connected to the first nozzle; A pipe is provided between the second port and the first nozzle, extending upward from the second port and then bending downward.

3. The anti-icing pipeline as described in claim 2, characterized in that, The second port is located on the upper side of the flow direction adjustment section.

4. The anti-icing pipeline as described in claim 1, characterized in that, The third port is connected to the second nozzle via a valve.

5. The anti-icing pipeline as described in any one of claims 1 to 4, characterized in that, A throat section is provided between the contraction section and the diffusion section, and the jet orifice is formed within the throat section; The outlet of the contraction section is connected to the inlet of the diffusion section through a jet orifice. The diameter of the jet orifice is smaller than the diameter of the first port; The diameter of the jet orifice is smaller than the diameter of the third port; The second port is connected to the throat segment.

6. The anti-icing pipeline as described in any one of claims 1 to 4, characterized in that, A throat segment is provided between the contraction segment and the diffusion segment, and an inner cavity is formed within the throat segment; The outlet side of the contraction section extends into the inner cavity, and the inner hole gradually decreases, forming the jet hole at the outlet end of the contraction section; The throat section is provided with a throat opposite to the jet hole, the throat is connected to the inlet of the diffuser section, and the inner diameter of the throat is not greater than the inner diameter of the inlet of the diffuser section; The second port is connected to the inner cavity.

7. The anti-icing pipeline as described in claims 1-4, characterized in that, The flow direction adjustment part includes a connecting pipe and an outer pipe body; One end of the outer tube forms the first port, and the other end forms the third port; From the first port to the third port, the outer tube body is sequentially provided with the constriction section, the throat section and the diffusion section; The second port is formed at the upper end of the connecting pipe, the lower end of the connecting pipe passes through the side wall of the outer pipe body and enters the interior of the outer pipe body, and extends a section towards the throat segment. A connecting port is formed at the end of the connecting pipe located inside the outer pipe body, opening towards the throat segment. The jet orifice is formed between the connecting port and the throat segment and has an annular structure.

8. A cooling tower, characterized in that, have: Air inlet located at the bottom of the cooling tower; Air outlet located at the top of the cooling tower; A filler layer located between the airflow inlet and the airflow outlet, the filler layer having a first region and a second region spaced apart in the horizontal direction; A spray manifold located on the upper side of the packing layer for spraying fluid onto the packing layer, the spray manifold including an anti-icing conduit as described in any one of claims 1 to 7; wherein the first nozzle is used to spray fluid onto the first area; and the fluid flowing out of the third port is deviated from the first area.

9. The cooling tower as described in claim 8, characterized in that, The fluid flowing out of the third port flows into the second region.

10. The cooling tower as described in claim 8, characterized in that, The first region and the second region are separated by a longitudinal partition.

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