Heat exchange equipment and cooling tower using same

Abstract

The invention discloses heat exchange equipment and a cooling tower using the heat exchange equipment, and relates to the technical field of cooling towers, and the heat exchange equipment comprises a heat exchange pipe assembly which comprises a plurality of straight pipes arranged in parallel; the movable descaling modules are arranged on the straight pipes in a sleeving mode in an axial moving mode, shaft barrels are rotationally installed at the positions, corresponding to the straight pipes, of the movable descaling modules, and cleaning pieces used for cleaning the outer surfaces of the straight pipes are arranged in the shaft barrels. And meanwhile, the shaft barrel and the cleaning piece rotate to remove scale online, the dual effects cooperate to guarantee that the heat exchange efficiency is in a high-efficiency interval for a long time, the cleaning process is fully automatically completed online, shutdown chemical cleaning or manual operation is not needed, and therefore production interruption loss and chemical pollution are avoided, and the maintenance cost and time are greatly reduced.

Description

Technical Field

[0001] This application relates to the technical field of cooling towers, and more specifically, to a heat exchange device and a cooling tower using the heat exchange device. Background Technology

[0002] With the continuous development of industrial production, cooling towers, as core equipment in circulating water cooling systems, directly affect the energy consumption and economy of the entire system due to their heat exchange efficiency. Heat exchange equipment, especially the heat exchange tube bundles in cooling towers, are constantly exposed to the cooling water environment, making them highly susceptible to the formation of scale, biological slime, and other deposits on the outer surface of the tube walls due to water quality issues. These deposits significantly increase thermal resistance, leading to a severe decrease in heat exchange efficiency, increased system energy consumption, and even equipment failure due to flow channel blockage.

[0003] Currently, the industry mainly relies on two methods for cleaning and maintaining cooling tower heat exchange tubes: shutdown chemical cleaning or manual mechanical cleaning. However, the inventors realized that chemical cleaning requires injecting acid or alkaline cleaning agents into the system to dissolve scale, which requires interrupting production and poses a risk of equipment corrosion. Manual mechanical cleaning also suffers from problems such as high labor intensity, harsh working environment, long cleaning cycle, and difficulty in cleaning dead corners.

[0004] To address the aforementioned issues, we provide a heat exchange device and a cooling tower using the heat exchange device. Summary of the Invention

[0005] To address the problems mentioned in the background art, this application provides a heat exchange device and a cooling tower using the heat exchange device.

[0006] The heat exchange device and the cooling tower using the heat exchange device provided in this application adopt the following technical solution: A heat exchange device, comprising: A heat exchange tube assembly comprising multiple parallel straight tubes; At least one movable descaling module is axially movable and sleeved on the straight pipe. A shaft cylinder is rotatably installed on the movable descaling module corresponding to the position of each straight pipe. A cleaning component for cleaning the outer surface of the straight pipe is provided inside the shaft cylinder.

[0007] In some embodiments, the mobile descaling module includes a mobile fin, and the shaft is rotatably mounted on the mobile fin via bearings; A fin structure for disturbing the flow field is also provided between adjacent movable fins.

[0008] In some embodiments, positioning rods are installed at both ends of multiple movable fins in the same row, and long slide bars are installed on the positioning rods; The heat exchange device is also provided with straight grooves on both sides that slide in conjunction with the long slide bar; A synchronizing rod is also installed on the end of the two positioning rods in the same row.

[0009] In some embodiments, a drive mechanism is also included, which includes a waterproof drive motor, a curved roller driven by the waterproof drive motor, and a connecting rod with one end hinged to the curved roller. The other end of the connecting rod is hinged to the middle of the synchronizing rod, which is used to convert the rotational motion of the curved roller into the axial reciprocating motion of the moving fin.

[0010] In some embodiments, a fixedly installed filter plate is also included, the bottom of which is provided with a serrated rack; The outer periphery of the shaft cylinder is provided with oblique tooth grooves that mesh with the oblique rack; When the movable fin moves axially, the shaft cylinder is driven to rotate through the meshing of the helical rack and helical groove.

[0011] In some embodiments, the cleaning component is a cleaning belt installed on the inner wall of the shaft cylinder, the inner wall of the cleaning belt is provided with multiple rows of friction rollers along the axial direction, and the surfaces of the cleaning belt and the friction rollers are provided with a ceramic coating.

[0012] In some embodiments, an inner groove is also provided on the outer surface of the shaft cylinder; The cleaning component is a cleaning ring embedded in the inner groove, and the inner wall of the cleaning ring is provided with multiple cleaning brushes.

[0013] In some embodiments, the heat exchange tube assembly further includes two tube grooves; Multiple straight pipes are connected by elbows to form a serpentine pipe bundle, and the inlet and outlet of the pipe bundle are respectively connected to two pipe grooves; The vertically adjacent straight pipes are arranged in a staggered manner, and the elbows connecting them are installed at a corresponding angle.

[0014] In some implementations, a spray assembly is also included; The spray assembly includes a meandering spray pipe with multiple cold water nozzles equidistantly arranged along the forward direction. The cold water nozzles are used to spray cooling water onto the heat exchange tube assembly.

[0015] On the other hand, this application also provides a cooling tower, including a shell and the aforementioned heat exchange device; The shell consists of an upper tower and a lower water tank, with the upper tower erected above the lower water tank via a support frame. A water pump is also installed on the outside of the water tank, which is used to transport water from the water tank to the spray assembly.

[0016] In summary, the technical solution of this application embodiment actively disturbs the water flow by moving the axial movement of the fins, continuously destroying the thermal boundary layer. At the same time, the shaft and cleaning components rotate online to remove scale. The dual effects work together to ensure that the heat exchange efficiency remains in the high-efficiency range for a long time. Moreover, the cleaning process is completed automatically online, without the need for shutdown for chemical cleaning or manual operation, thereby avoiding production interruption losses and chemical pollution, and greatly reducing maintenance costs and time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the exterior of the cooling tower in this application; Figure 2 This is a cross-sectional schematic diagram of the cooling tower of this application; Figure 3 This is a schematic diagram of the structure of the mobile descaling module of this application; Figure 4 This is an exploded view of the mobile descaling module of this application; Figure 5 This is a schematic diagram of one structure of the shaft cylinder of this application; Figure 6 This is a schematic diagram of another structure of the shaft cylinder of this application; Figure 7 This is a schematic diagram of one connection of the heat exchanger tube assembly of this application; Figure 8 This is another connection diagram of the heat exchanger tube assembly of this application; Figure 9 This is a schematic diagram of the structure of the spray assembly of this application; Figure 10 This application Figure 4 A schematic diagram of the structure of part A.

[0018] Explanation of reference numerals in the attached drawings: 100, upper tower body; 200, lower water tank; 300, water pump; 21. Heat exchanger tube assembly; 2101. Straight tube; 2102. Elbow; 2103. Tube groove; 22. Mobile descaling module; 2201. Mobile finned plate; 2202. Shaft cylinder; 22021. Inclined toothed groove; 22022. Cleaning belt; 22023. Friction roller; 22024. Embedded groove; 22025. Cleaning ring; 22026. Cleaning brush; 2203. Positioning rod; 2204. Long slide bar; 2205. Straight groove; 2206. Synchronizing rod; 2207. Waterproof drive motor; 2208. Curved roller; 2209. Connecting rod; 2210. Filter plate; 2211. Inclined toothed rack; 2212. Finned structure; 23. Sprinkler assembly; 2301. Sprinkler pipe; 2302. Cold water nozzle. Detailed Implementation

[0019] The following is in conjunction with the appendix Figures 1 to 10 The present invention will be described in further detail below.

[0020] In the description of this application, it should be understood that the terms "thickness," "upper," "top," "bottom," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] It should be noted that the accompanying drawings are schematic and not to scale. For clarity and convenience, the relative dimensions and proportions of the parts shown are exaggerated or reduced in size; all dimensions are merely illustrative and not limiting. Furthermore, the same reference numerals are used for the same structures, elements, or fittings appearing in more than two drawings to indicate similar features.

[0022] In related technologies, chemical cleaning requires the injection of acid or alkaline cleaning agents into the system to dissolve scale, which requires production to be interrupted and poses a risk of equipment corrosion. Manual mechanical cleaning also has the problems of high labor intensity, harsh working environment, long cleaning cycle and difficulty in cleaning dead corners. Reference Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, this application provides a heat exchange device, the core of which is applied to a cooling tower. The cooling tower includes a shell, which is composed of an upper tower body 100 and a lower water tank 200. The upper tower body 100 is erected above the lower water tank 200 by a steel frame structure. The gap between the upper tower body 100 and the lower water tank 200 is used as an air inlet to facilitate the entry of cold air. In addition, a water pump 300 is installed on the outside of the lower water tank 200. Specifically, the heat exchange equipment mainly includes a heat exchange tube assembly 21, a mobile descaling module 22, and a spray assembly 23. The inlet of the water pump 300 extends to the bottom wall of the lower water tank 200, which can draw cooling water from the lower water tank 200. The outlet of the water pump 300 is connected to the spray assembly 23, which can lift the cooling water and release it through the spray assembly 23, thereby exchanging heat with the heat exchange tube assembly 21.

[0023] Reference Figures 2 to 4 , Figure 10As shown in the embodiment of this application, the heat exchange tube assembly 21 is composed of multiple parallel straight metal tubes 2101 (such as copper tubes or stainless steel tubes), and is divided into multiple layers from top to bottom. The straight tubes 2101 corresponding to the upper and lower layers are connected by U-shaped elbows 2102 to form a multi-layer serpentine tube bundle. Furthermore, the elbow 2102 and the straight pipe 2101 are connected by a flange. After all the elbows 2102 on the same side of the tube bundle are removed, the mobile descaling module 22 can be removed from the heat exchange tube assembly 21 for maintenance or replacement. Specifically, the upper and lower straight pipes 2101 are arranged in a staggered manner, and the elbows 2102 connecting them are installed at an angle accordingly. The elbows 2102 at both ends of the pipe bundle are set in opposite directions. This layout can optimize the flow field distribution. The total inlet and total outlet of the pipe bundle are connected to pipe grooves 2103 respectively. The upper pipe groove 2103 is connected to the external hot water inlet pipe, and the lower pipe groove 2103 is connected to the cooling water outlet pipe. In this embodiment of the application, the mobile descaling module 22 is used to remove scale from the surface of the straight pipe 2101. In each layer of straight pipe 2101 area, a plurality of mobile fins 2201 that can move along the axial direction of the straight pipe 2101 are provided. Specifically, the movable fin 2201 is a rectangular plate structure with through holes corresponding to the straight tubes 2101. At each through hole, a shaft cylinder 2202 is rotatably installed via a rolling bearing. The shaft cylinder 2202 can therefore be freely rotated and fitted onto the corresponding straight tube 2101. In addition, the outer diameter of the shaft section of the shaft cylinder 2202 that extends beyond the movable fin 2201 increases until the top end exceeds the highest point of the movable fin 2201. At the gap between adjacent movable fins 2201, a corrugated fin structure 2212 is welded or integrally formed to disturb and slow down the cooling water flow rate and enhance heat transfer. Furthermore, in order to maintain the synchronous movement of multiple movable fin plates 2201, longitudinal positioning rods 2203 are fixedly installed at both ends of all movable fin plates 2201 in the same row by bolts. A long sliding bar 2204 is fixed on the outer side of each positioning rod 2203. On the inner side wall of the upper tower body 100, a longitudinal straight groove 2205 is opened corresponding to the position of the long sliding bar 2204. The long sliding bar 2204 is embedded in the straight groove 2205 and can slide along its axial direction. One end of each of the two positioning rods 2203 located at both ends of the same row is connected by a transverse synchronizing rod 2206, so that all the moving fins 2201 form a rigid integral frame. In this embodiment of the application, a driving mechanism is also provided for driving the reciprocating movement of the movable fin plate 2201. The mechanism includes a waterproof drive motor 2207 installed inside the upper tower body 100. The output shaft of the waterproof drive motor 2207 is vertically downward and connected to a curved roller 2208. The specific curved roller 2208 is provided with multiple eccentric cranks with different phase angles. Each crank is set in a one-to-one correspondence with each synchronous rod 2206. A connecting rod 2209 is hinged to each eccentric crank through a bearing. The other end of the connecting rod 2209 is hinged to the middle of the synchronous rod 2206 of the corresponding layer. During operation, when the waterproof drive motor 2207 rotates at a constant speed, the rotational motion can be converted into regular intermittent reciprocating linear motion of the moving fin 2201 along the axial direction of the straight tube 2101 through the cooperation of the curved roller 2208 and the connecting rod 2209. The advantages of this motion are twofold: firstly, when multiple moving fins 2201 are driven to move intermittently, the flow rate of the cooling water can be further disturbed and slowed down, thereby enhancing the heat transfer effect; secondly, it provides axial drive for the rotation and cleaning of the shaft cylinder 2202. It should be noted that a movable descaling module 22 is installed on each of the multiple straight pipes 2101 in each layer, and the movable descaling modules 22 in each layer maintain relative sliding. That is, each eccentric crank on the curved roller 2208 can drive the movable descaling module 22 of the corresponding layer to perform regular intermittent reciprocating linear motion through the connecting rod 2209 that cooperates with it.

[0024] Furthermore, refer to Figures 3 to 6 As shown, a filter plate 2210 is fixedly installed above the movement path of each set of movable fins 2201. The filter plate 2210 mainly plays the role of collecting water and guiding flow, and a serrated rack 2211 is fixed at its bottom. Meanwhile, the outer circular surface of the large outer diameter shaft section of each shaft cylinder 2202 is machined with helical tooth grooves 22021 that match the helical rack 2211. When the moving fin plate 2201 moves axially along the straight tube 2101 under the drive of the drive component, the helical tooth grooves 22021 on the shaft cylinder 2202 will mesh with the fixed helical rack 2211, thereby forcing the shaft cylinder 2202 to rotate around its own axis. On the other hand, the way the helical rack 2211 and the helical groove 22021 cooperate means that when the mobile descaling module 22 needs to be removed for maintenance and replacement, after removing the corresponding support structure, the mobile descaling module 22 can be directly pushed to slide along the helical rack 2211 to separate it. When installing a new mobile descaling module 22, it is only necessary to engage each helical groove 22021 in the mobile descaling module 22 with the helical rack 2211 to reinstall it. The operation is simple and convenient and easy to maintain. Meanwhile, a cleaning component is installed inside the shaft cylinder 2202; As one implementation method, such as Figure 5As shown, the cleaning component can be an annular cleaning belt 22022, with multiple rows of freely rotatable micro friction rollers 22023 embedded in its inner wall along the axial direction. The surfaces of the cleaning belt 22022 and the friction rollers 22023 can be sprayed with a wear-resistant ceramic coating to extend their service life. During installation, the side of the cleaning belt 22022 with the friction rollers 22023 will wrap around the straight tube 2101. When the shaft cylinder 2202 rotates, it drives the cleaning belt 22022 and the friction roller 22023 to rotate together. The friction roller 22023 forms rolling friction with the outer wall of the straight pipe 2101, which effectively removes scale. As an alternative implementation method, such as Figure 6 As shown, the cleaning component can also be a cleaning ring 22025 embedded in the groove 22024 of the inner wall of the shaft cylinder 2202, with a flexible nylon cleaning brush 22026 embedded in its inner wall, which cleans by sliding friction of the bristles.

[0025] In addition, refer to Figure 2 , Figure 9 As shown, the spray assembly 23 is located directly above the heat exchange tube assembly 21. It includes a meandering spray pipe 2301, on which multiple atomizing cold water nozzles 2302 are installed at equal intervals. The inlet of the water pump 300 extends into the lower water tank 200, and the outlet is connected to the spray pipe 2301. During operation, it is used to pressurize the cooling water and spray it evenly onto the high-temperature heat exchange tube surface, thereby achieving efficient heat transfer.

[0026] Based on this, the working principle of the cooling tower in this application is as follows: Main heat exchange process: High-temperature process fluid can enter the heat exchange tube assembly 21 from the upper inlet pipe trough 2103. The fluid then flows from top to bottom in a multi-layer serpentine tube bundle formed by connecting multiple straight pipes 2101 and elbows 2102. At the same time, the water pump 300 installed outside the lower water tank 200 is started to transport the cold water at a lower temperature after natural air cooling or evaporative cooling at the bottom of the cooling tower to the spray assembly 23 at the top of the tube bundle. The spray pipes 2301 arranged in a meandering manner in the spray assembly 23 and the cold water nozzles 2302 evenly distributed on them spray the low-temperature water evenly in the form of mist or droplets on the outer surface of the entire heat exchange tube bundle. The high-temperature tube wall is in direct contact with the low-temperature cold water, and heat is carried away through conduction and evaporation to complete the counter-current heat exchange. Part of the heated water evaporates, and the rest falls into the lower water tank 200 below for recycling. The cooled process fluid flows out from the lower outlet pipe trough 2103 and returns to the production system. Moving disturbances and active enhanced heat transfer processes: After the waterproof drive motor 2207 is started, it will drive the curved roller 2208 to rotate. Through multiple connecting rods 2209 hinged on the eccentric cranks of different phases, the rotational motion is converted into linear reciprocating motion of the synchronous rods 2206 corresponding to each heat exchange tube. The synchronous rods 2206 drive the entire row of moving fins 2201 to move slowly and smoothly along the axis of the straight tube 2101 through the sliding cooperation of the positioning rod 2203 and the long slide bar 2204 with the straight groove 2205. During the movement, the fin structure 2212 fixed on the fins moves synchronously and continuously generates active, sweeping disturbance to the cooling water. This dynamic disturbance can effectively destroy the static water film and thermal boundary layer on the surface of the heat exchange tube assembly 21, enhance turbulence, and thus actively and continuously strengthen the heat transfer process without increasing the head of the water pump 300. Rotary drive and mechanical cleaning process: While the moving fin plate 2201 moves axially, the helical rack 2211 at the bottom of the fixed filter plate 2210 above the moving path meshes with the helical groove 22021 installed on the outer periphery of the shaft cylinder 2202. This ingenious design directly converts the linear motion of the moving fin plate 2201 into the rotational motion of each shaft cylinder 2202 around the straight tube 2101, and the cleaning components inside the shaft cylinder 2202 rotate synchronously. When the cleaning components are cleaning belt 22022 and friction roller 22023: The rotating friction roller 22023, whose surface is covered with ceramic coating, rolls and rubs on the surface of the straight tube 2101, just like a miniature roller, which can efficiently crush and peel off the attached scale, while its own wear is extremely low. When the cleaning components are cleaning ring 22025 and cleaning brush 22026: Rotation causes the flexible bristles to slide, scrape, and brush the surface of the straight tube 2101, removing biological slime and soft grime. The cleaning process is carried out without any blind spots throughout the entire circumference and axial travel range of the straight pipe 2101. The scraped scale is immediately flushed away by the flowing cooling water and discharged into the lower water tank 200.

[0027] All standard parts used in this application can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from the spirit and scope of this application, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A heat exchange apparatus, characterized by, include: A heat exchange tube assembly (21) includes a plurality of parallel straight tubes (2101). At least one movable descaling module (22) is axially movable and sleeved on the straight pipe (2101). A shaft cylinder (2202) is rotatably installed on the movable descaling module (22) corresponding to the position of each straight pipe (2101). A cleaning component for cleaning the outer surface of the straight pipe (2101) is provided inside the shaft cylinder (2202).

2. A heat exchange device according to claim 1, wherein: The mobile descaling module (22) includes a mobile fin plate (2201), and the shaft cylinder (2202) is rotatably mounted on the mobile fin plate (2201) via a bearing; A fin structure (2212) for disturbing the flow field is also provided between adjacent movable fins (2201).

3. A heat exchange device according to claim 2, wherein: Both ends of the multiple movable fin plates (2201) in the same row are equipped with positioning rods (2203), and long slide bars (2204) are installed on the positioning rods (2203). The heat exchange device is also provided with straight grooves (2205) on both sides that slide in cooperation with the long slide bar (2204). A synchronizing rod (2206) is also installed on the ends of the two positioning rods (2203) in the same row.

4. A heat exchange device according to claim 3, characterized in that: It also includes a drive mechanism, which includes a waterproof drive motor (2207), a curved roller (2208) driven by the waterproof drive motor (2207), and a connecting rod (2209) with one end hinged to the curved roller (2208). The other end of the connecting rod (2209) is hinged to the middle of the synchronizing rod (2206) to convert the rotational motion of the curved roller (2208) into the axial reciprocating motion of the moving fin plate (2201).

5. A heat exchange device according to claim 4, characterized in that: It also includes a fixedly installed filter plate (2210), the bottom of which is provided with a serrated rack (2211). The outer periphery of the shaft cylinder (2202) is provided with a helical tooth groove (22021) that meshes with the helical rack (2211). When the movable fin (2201) moves axially, the shaft cylinder (2202) is driven to rotate through the meshing of the helical rack (2211) and the helical groove (22021).

6. A heat exchange device according to claim 1, wherein: The cleaning component is a cleaning belt (22022) installed on the inner wall of the shaft cylinder (2202). The inner wall of the cleaning belt (22022) is provided with multiple rows of friction rollers (22023) along the axial direction. The surfaces of the cleaning belt (22022) and the friction rollers (22023) are provided with a ceramic coating.

7. A heat exchange device according to claim 1, wherein: An inner groove (22024) is also provided on the outer side of the shaft cylinder (2202). The cleaning component is a cleaning ring (22025) embedded in the inner groove (22024), and the inner wall of the cleaning ring (22025) is provided with a plurality of cleaning brushes (22026).

8. A heat exchange device according to claim 1, wherein: The heat exchange tube assembly (21) also includes two tube grooves (2103). Multiple straight pipes (2101) are connected by elbows (2102) to form a serpentine pipe bundle, and the inlet and outlet of the pipe bundle are respectively connected to two pipe grooves (2103); The vertically adjacent straight pipes (2101) are arranged in a staggered manner, and the elbows (2102) connecting them are installed at a corresponding angle.

9. A heat exchange device according to claim 1, characterized in that: It also includes a spray assembly (23); The spray assembly (23) includes a meandering spray pipe (2301) with multiple cold water nozzles (2302) equidistantly arranged along the forward direction on the spray pipe (2301). The cold water nozzles (2302) are used to spray cooling water onto the heat exchange tube assembly (21).

10. A cooling tower characterized by, Includes a housing, and a heat exchange device as described in any one of claims 1 to 9: The shell consists of an upper tower (100) and a lower water tank (200), with the upper tower (100) erected above the lower water tank (200) by a support frame; A water pump (300) is also installed on the outside of the lower water tank (200). The inlet of the water pump (300) is connected to the lower water tank (200) and is used to provide cooling water for heat exchange in a heat exchange device.

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