Heat exchanger for waste heat recovery of cooling water for hot dip galvanizing of steel pipes

Abstract

The invention discloses a heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes, and relates to the technical field related to heat exchangers, including a mounting frame, a heat exchanging mechanism, and a driving mechanism. The heat exchanging mechanism includes a water storage cylinder and a cold water inlet pipe, and a hot water intake and drainage pipe connected to the driving mechanism and rotatably installed inside the water storage cylinder. A cold water storage chamber is provided inside the water storage cylinder, and the water flow directions of the cold water storage chamber and the hot water intake and drainage pipe are opposite; an adjusting component is slidably assembled inside the water storage cylinder to adjust the heat exchange time between cold water and hot water, and the adjusting component includes a moving disk rotatably connected to the hot water intake and drainage pipe, and one side of the moving disk is slidably connected to the inner wall of the water storage cylinder; the movement of the moving disk changes the length of the cold water storage chamber, that is, changes the moving time of the cold water in the cold water storage chamber on the surface of the hot water intake and drainage pipe; water of the required temperature can be obtained, thereby improving the use range of the heat exchanger.

Description

Technical Field

[0001] The present invention relates to the technical field related to heat exchangers, and in particular to a heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes. Background Art

[0002] In the production process of hot-dip galvanizing of steel pipes, the steel pipes need to be cooled by cooling water after annealing to avoid oxidation and deformation of the steel pipes. When the cooling water absorbs heat from the steel pipe, its temperature will rise and become "hot water". This cooling process will take away a lot of heat. If it is not recycled, it will not only cause energy waste, but also may cause thermal pollution to the environment; heat exchanger, also known as heat exchanger or heat exchange equipment, is an energy-saving device that realizes heat transfer between materials between two or more fluids at different temperatures. It works based on the principles of heat conduction and convection heat transfer, and is mainly used to transfer heat from hot fluids to cold fluids to meet specific process requirements; heat exchangers can effectively transfer waste heat in cooling water to other fluids, realize energy recovery and utilization, and thus improve energy utilization.

[0003] The working principle of the heat exchanger mainly includes the following aspects: First, there are two different fluid flow channels inside the heat exchanger, one for the hot fluid and the other for the cold fluid. The two fluids flow crosswise in the heat exchanger. Secondly, when the hot fluid flows through the heat transfer surface of the heat exchanger, its heat is transferred to the cold fluid by conduction. Heat conduction is a process in which heat is transferred from a high temperature area to a low temperature area, usually through direct contact of solid materials. In addition, the heat exchanger also uses convection heat transfer to improve the heat transfer efficiency. Due to the temperature difference between the hot fluid and the cold fluid, convection occurs, so that the heat of the hot fluid is transferred to the cold fluid in the form of fluid.

[0004] However, in the existing production process of hot-dip galvanizing of steel pipes, although the heat exchanger can effectively transfer the waste heat in the hot water to other fluids to achieve energy recovery and utilization, the size of the pipe carrying heat to circulate the hot water and the pipe circulating cold water alone in the heat exchanger are fixed, resulting in the same area when the hot water is transferred from the hot fluid to the cold fluid. It is impossible to further accurately control the heat exchange time from the hot fluid to the cold fluid in the hot water, resulting in a single temperature transferred by the cold fluid, and the scope of use is limited. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the heat exchange effect of the traditional heat exchanger is limited and water within the required temperature range cannot be obtained, and to propose a heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes: it includes a mounting frame, a heat exchange mechanism, and a driving mechanism, the heat exchange mechanism includes a water storage cylinder and a cold water inlet pipe fixed between the mounting frames, and a hot water drainage pipe connected to the driving mechanism and rotatably mounted inside the water storage cylinder for cooling the hot-dip galvanized steel pipes, a cold water storage chamber is provided inside the water storage cylinder, and the water flow direction of the cold water storage chamber is opposite to that of the hot water drainage pipe; it also includes an adjusting component slidably assembled inside the water storage cylinder for adjusting the heat exchange time between cold water and hot water, the adjusting component includes a movable disk rotatably connected to the hot water drainage pipe, and one side of the movable disk is slidably connected to the inner wall of the water storage cylinder; the movement of the movable disk changes the length of the cold water storage chamber, that is, changes the time for the cold water inside the cold water storage chamber to move on the surface of the hot water drainage pipe.

[0007] As a further description of the heat exchanger for recovering waste heat from cooling water of hot dip galvanized steel pipes mentioned above:

[0008] The driving mechanism comprises a motor fixed on a mounting frame, a power output shaft of the motor and a hot water intake and drainage pipe are both fixedly mounted with pulleys, and a belt is sleeved between the two pulleys.

[0009] As a further description of the heat exchanger for recovering waste heat from cooling water of hot dip galvanized steel pipes mentioned above:

[0010] The regulating assembly also includes a sleeve which is spirally connected to the hot water intake and drainage pipe. The movable disk is rotatably mounted on the sleeve via a waterproof bearing. The movable disk is a hollow shell structure.

[0011] As a further description of the heat exchanger for recovering waste heat from cooling water of hot dip galvanized steel pipes mentioned above:

[0012] The inner wall of the water storage cylinder is provided with a slide groove, and a slider adapted to the slide groove is fixedly installed on the outer edge of the movable plate. The adjustment component also includes a micro electric telescopic rod fixedly installed on the outside of the movable plate, and a limit gear is fixedly installed on the sleeve located inside the movable plate. The output end of the electric telescopic rod passes through the movable plate and is inserted between the teeth of the limit gear. The adjustment component also includes a foldable bellows fixedly installed on the movable plate, and a storage cylinder and a water outlet pipe installed on the storage cylinder are fixedly installed on the water storage cylinder, and the end of the bellows away from the movable plate is fixedly installed inside the storage cylinder.

[0013] As a further description of the heat exchanger for recovering waste heat from cooling water of hot dip galvanized steel pipes mentioned above:

[0014] A spoiler assembly is mounted on one side of the movable plate, and the spoiler assembly comprises a water delivery plate fixedly mounted on the sleeve, and a water outlet hole is penetrated inside the water delivery plate. A plurality of annular equidistantly arranged protrusions are fixedly mounted on the water delivery plate.

[0015] In summary, due to the use of the above-mentioned technical steel tube hot-dip galvanizing cooling water waste heat recovery heat exchanger, the beneficial effects of the present invention are:

[0016] The hot water drain pipe is driven to rotate by a driving mechanism. When the hot water drain pipe rotates, the hot water drain pipe drives the movable disk in the regulating component to slide inside the water storage cylinder, so that the length of the hot water storage chamber inside the water storage cylinder changes, so that the cold water coming in from the cold water inlet pipe can change the time it receives heat transfer when it contacts with hot water drain pipes of different lengths, so that the position of the movable disk is controlled by the driving device, and the heated cold water is directly discharged from the other side of the movable disk, so that water of the required temperature can be obtained, so that the heat exchange method of the heat exchanger can obtain the required temperature according to demand, thereby improving the use range of the heat exchanger; water of different temperatures is used to preheat new cold water or other media that need to be heated, so that the dependence on external heat sources can be reduced, and energy consumption and operating costs can be reduced; in addition, the spoiler component is used to make the water flow around the hot water drain pipe evenly discharged during the discharge of the heated water, so that the discharged hot water will not be only the water at the bottom of the water storage cylinder, so that the temperature of the discharged hot water is within a certain range and will not deviate too much. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It shows a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0018] Figure 2 A main cross-sectional view of a water storage cylinder structure provided according to an embodiment of the present invention is shown;

[0019] Figure 3 A cross-sectional view of a local structure of a hot water intake and drainage pipe provided according to an embodiment of the present invention is shown;

[0020] Figure 4 A partial structural cross-sectional view of a moving disk provided according to an embodiment of the present invention is shown;

[0021] Figure 5 It shows a schematic structural diagram of a water delivery tray provided according to an embodiment of the present invention;

[0022] Figure 6 A schematic diagram of the storage tube structure provided according to an embodiment of the present invention is shown;

[0023] Figure 7 The embodiment of the present invention provides Figure 3 A magnified view of the structure at A.

[0024] Legend:

[0025] 10. Mounting frame;

[0026] 20. heat exchange mechanism; 21. cold water inlet pipe; 22. hot water drainage pipe; 23. cold water storage chamber; 24. water storage cylinder; 25. adjustment component; 251. moving plate; 252. sleeve; 253. limit gear; 254. bellows; 255. slide; 256. slider; 257. electric telescopic rod; 258. storage cylinder; 259. water outlet pipe; 26. spoiler component; 261. water delivery plate; 262. raised block; 263. water outlet hole;

[0027] 30. Driving mechanism; 31. Motor; 32. Belt; 33. Pulley. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figure 1-Figure 7 As shown, the heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes provided by the present invention comprises a mounting frame 10, a heat exchange mechanism 20, and a driving mechanism 30. The heat exchange mechanism 20 comprises a water storage cylinder 24 and a cold water inlet pipe 21 fixed between the mounting frames 10. The cold water inlet pipe 21 is connected to an input pipe of a cold water pipe to be heated from the outside, so as to input cold water to be heated inside the water storage cylinder 24; and a hot water intake and drainage pipe 22 connected to the driving mechanism 30 and rotatably mounted inside the water storage cylinder 24 for cooling after hot-dip galvanizing of the steel pipe, wherein the hot water intake and drainage pipe 22 is also connected to a heat intake and drainage pipeline for removal, so as to transfer the heat to the inside of the heat exchange mechanism 20; a cold water storage chamber 23 is provided inside the water storage cylinder 24, and the cold water storage chamber 23 is used to transfer cold water, so that the cold water is evenly distributed on the periphery of the hot water intake and drainage pipe 22. It is convenient for cold water to be in uniform contact with the hot water drainage pipe 22; wherein, the hot water drainage pipe 22 is made of copper and has thermal conductivity, which facilitates the heat transfer of the hot water drainage pipe 22 to the cold water, and the water storage cylinder 24 is made of a transparent polycarbonate plate material in the prior art, which not only has a heat preservation effect, but also can observe the structure inside the pipe, thereby realizing the heat preservation of the cold water after heating; in addition, the water flow direction of the cold water storage chamber 23 is opposite to that of the hot water drainage pipe 22; the water flow direction of the hot water drainage pipe 22 is opposite to that inside the cold water storage chamber 23, which can improve the heat transfer efficiency, because when the water inside the hot water drainage pipe 22 and the cold water storage chamber 23 is in the same direction and at the same speed, it is easy for the hot water to always transfer heat to the cold water at a fixed position, and the heat exchange effect cannot be achieved. Compared with the hot water contacting the cold water at different positions, the heat exchange effect is poor.

[0030] like Figure 1-Figure 5As shown, the driving mechanism 30 includes a motor 31 fixed on the mounting frame 10, and pulleys 33 are fixedly installed on the power output shaft of the motor 31 and the hot water drainage pipe 22, and a belt 32 is sleeved between the two pulleys 33. The motor 31 is a servo motor in the prior art, which can make its power output shaft rotate at a constant speed in different directions. When the motor 31 rotates, the hot water drainage pipe 22 can be driven to rotate due to the cooperation between the pulley 33 and the belt 32. The hot water drainage pipe 22 is connected to the mounting frame 10 and the water storage cylinder 24 through a waterproof bearing to prevent water inside the water storage cylinder 24 from flowing out.

[0031] like Figure 1-Figure 7 As shown, it also includes an adjusting component 25 slidably assembled inside the water storage cylinder 24 for adjusting the heat exchange time between cold water and hot water. The adjusting component 25 includes a movable disk 251 rotatably connected to the hot water drainage pipe 22. The adjusting component 25 also includes a sleeve 252 spirally connected to the hot water drainage pipe 22. The movable disk 251 is rotatably mounted on the sleeve 252 through a waterproof bearing. The waterproof bearing is a structure in the prior art that the outer ring wall and the inner ring wall can rotate relative to each other without water leakage in the middle.

[0032] In further detail, the movable plate 251 is a hollow shell structure, and one side of the movable plate 251 is slidably connected to the inner wall of the water storage cylinder 24; wherein the adjustment component 25 also includes a micro electric telescopic rod 257 fixedly mounted on the outside of the movable plate 251, and the electric telescopic rod 257 is a structure in the prior art in which the output end is rod-shaped and can be telescopic; a limited gear 253 is fixedly mounted on the sleeve 252 inside the movable plate 251, and the output end of the electric telescopic rod 257 passes through the movable plate 251 and is inserted between the teeth of the limited gear 253, so that the limited gear 253 and the electric telescopic rod 257 are firmly fixed, so that the sleeve 252 can be firmly fixed to the movable plate 251; therefore, when the hot water intake and drainage pipe 2 When the hot water drain pipe 22 rotates under the drive of the driving mechanism 30, the sleeve 252 will be driven to rotate together. Since the inner wall of the water storage cylinder 24 is provided with a slide groove 255, and the outer edge of the movable plate 251 is fixedly installed with a slider 256 adapted to the slide groove 255, when the hot water drain pipe 22 rotates, an axial force will be generated on the sleeve 252, so that the sleeve 252 drives the movable plate 251 to slide on the surface of the hot water drain pipe 22; thereby, the length of the cold water storage chamber 23 can be changed, so that when the cold water inside the cold water storage chamber 23 moves from the end close to the cold water inlet pipe 21 to the end close to the movable plate 251, the heating time can be increased, so that the outlet water temperature can be changed according to the heating time of the cold water. The movement of the movable plate 251 changes the length of the cold water storage chamber 23, that is, changes the moving time of the cold water inside the cold water storage chamber 23 on the surface of the hot water drain pipe 22, so that the outlet water can reach the required temperature range.

[0033] In further detail, the adjustment component 25 also includes a foldable bellows 254 fixedly mounted on the movable disk 251, the bellows 254 is a high-temperature resistant plastic structure that can be folded and retracted in the prior art, a storage cylinder 258 and a water outlet pipe 259 installed on the storage cylinder 258 are fixedly mounted on the water storage cylinder 24, and the end of the bellows 254 away from the movable disk 251 is fixedly mounted inside the storage cylinder 258, and the storage cylinder 258 provides a storage space for the bellows 254; the bellows 254 does not occupy the internal space of the water storage cylinder 24 when shrinking; in addition, the bellows 254 can directly discharge the water stored in the movable disk 251, and the water outlet pipe 259 is controlled by a valve. When water within an appropriate range is needed, the water at that temperature can be released by opening the valve and cooperating with the bellows 254.

[0034] like Figure 2-Figure 7 As shown, a spoiler assembly 26 is installed on one side of the movable disk 251, and the spoiler assembly 26 includes a water delivery disk 261 fixedly mounted on the sleeve 252. The water delivery disk 261 always rotates with the hot water drainage pipe 22. When water within an appropriate range is needed, the hot water temperature range can preferably be divided into high-temperature, medium-temperature and low-temperature water. The position of the movable disk 251 inside the water storage cylinder 24 is observed to control the opening and closing of the electric telescopic rod 257, so as to obtain water within an appropriate range inside the water storage cylinder 24.

[0035] In further detail, the water delivery tray 261 is penetrated by a water outlet hole 263, and the water outlet hole 263 rotates with the water delivery tray 261, so that when draining water, the hot water discharged is not only the water at the bottom of the water storage cylinder 24, but also the water surrounding the hot water drainage pipe 22, so that the temperature of the hot water discharge is within a certain range and will not deviate too much, so as to avoid the discharged water being continuously discharged along the axial direction of the hot water drainage pipe 22; in addition, a plurality of annular equidistantly arranged raised blocks 262 are fixedly installed on the water delivery tray 261, and the raised blocks 262 are arranged in a circular manner. 62 is made of rubber, and the raised block 262 can rotate with the water delivery tray 261 to stir the water around the water delivery tray 261, ensuring that the hot water around the water delivery tray 261 can fully contact and exchange heat with the hot water intake and drainage pipe 22, thereby improving the heat exchange efficiency of the heat exchanger; in addition, when the water delivery tray 261 is close to the left end of the water storage cylinder 24, it can drive the raised block 262 to scrape the inner wall of the water storage cylinder 24, which can effectively avoid scaling on the left end face of the water storage cylinder 24, solving the problem of the troublesome cleaning of scaling inside the water storage cylinder 24 in the later stage.

[0036] Working principle: when warm boiled water within an appropriate range is needed, the motor 31 is first started. Due to the cooperation between the pulley 33 and the belt 32, the hot water intake and drainage pipe 22 can be driven to rotate. The movement of the movable plate 251 is controlled by controlling the switch of the electric telescopic rod 257. Since the output end of the electric telescopic rod 257 passes through the movable plate 251 and is inserted between the teeth of the limit gear 253, the limit gear 253 and the electric telescopic rod 257 are firmly fixed, so that the sleeve 252 can be firmly fixed to the movable plate 251. When the hot water intake and drainage pipe 22 rotates under the drive of the driving mechanism 30, the hot water intake and drainage pipe 22 will drive the sleeve The sleeve 252 rotates together. Since a slide groove 255 is provided on the inner wall of the water storage cylinder 24, a slider 256 compatible with the slide groove 255 is fixedly installed on the outer edge of the movable disk 251. Therefore, when the hot water intake and drainage pipe 22 rotates, an axial force is generated on the sleeve 252, so that the sleeve 252 drives the movable disk 251 to slide on the surface of the hot water intake and drainage pipe 22; thereby, the length of the cold water storage chamber 23 can be changed, so that when the hot water inside the cold water storage chamber 23 moves from the end close to the cold water inlet pipe 21 to the end close to the movable disk 251, the heat exchange time can be increased, so that the outlet water temperature of the hot water can be changed according to the heat exchange time of the hot water.

[0037] By installing a protruding block 262 on one side of the water delivery tray 261, the protruding block 262 can rotate with the water delivery tray 261, so as to stir the water around the water delivery tray 261, and ensure that the cold water around the water delivery tray 261 can fully contact and exchange heat with the hot water intake and drainage pipe 22, thereby improving the heat exchange efficiency of the heat exchanger; in addition, when the water delivery tray 261 is close to the left end of the water storage cylinder 24, it can drive the protruding block 262 to scrape the inner wall of the water storage cylinder 24, which can effectively avoid scaling on the left end face of the water storage cylinder 24, and solve the problem of the troublesome cleaning of scaling inside the water storage cylinder 24 in the later stage.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes to the heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes and the inventive concept thereof within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat exchanger for recovering waste heat from cooling water of hot-dip galvanized steel pipes, comprising a mounting frame (10), a heat exchange mechanism (20), and a drive mechanism (30), characterized in that: The heat exchange mechanism (20) comprises a water storage cylinder (24) and a cold water inlet pipe (21) fixed between the mounting frames (10), and a hot water inlet and outlet pipe (22) connected to the driving mechanism (30) and rotatably mounted inside the water storage cylinder (24) for cooling after being hot-dip galvanized by a steel pipe, wherein a cold water storage chamber (23) is provided inside the water storage cylinder (24), and the water flow direction of the cold water storage chamber (23) is opposite to that of the hot water inlet and outlet pipe (22); It also includes an adjustment component (25) slidably mounted inside the water storage cylinder (24) for adjusting the heat exchange time between cold water and hot water, the adjustment component (25) comprising a moving disk (251) rotatably connected to the hot water drainage pipe (22), and one side of the moving disk (251) is slidably connected to the inner wall of the water storage cylinder (24), and the movement of the moving disk (251) changes the length of the cold water storage chamber (23), that is, changes the length of time that the cold water inside the cold water storage chamber (23) moves on the surface of the hot water drainage pipe (22); The regulating assembly (25) further comprises a sleeve (252) which is screw-connected to the hot water intake and drainage pipe (22); the movable disk (251) is rotatably mounted on the sleeve (252) via a waterproof bearing; the movable disk (251) is a hollow shell structure; The regulating assembly (25) further comprises a foldable bellows (254) fixedly mounted on the movable disk (251); a storage cylinder (258) and a water outlet pipe (259) mounted on the storage cylinder (258) are fixedly mounted on the water storage cylinder (24); and one end of the bellows (254) away from the movable disk (251) is fixedly mounted inside the storage cylinder (258); A spoiler assembly (26) is mounted on one side of the movable plate (251), and the spoiler assembly (26) comprises a water delivery plate (261) fixedly mounted on the sleeve (252), and a water outlet hole (263) is penetrated inside the water delivery plate (261).

2. The heat exchanger for recovering waste heat from cooling water of hot-dip galvanizing steel pipe according to claim 1, characterized in that: The driving mechanism (30) comprises a motor (31) fixed on a mounting frame (10), a pulley (33) being fixedly mounted on a power output shaft of the motor (31) and a hot water intake and drainage pipe (22), and a belt (32) being sleeved between the two pulleys (33).

3. The heat exchanger for recovering waste heat from cooling water of hot-dip galvanizing steel pipe according to claim 1, characterized in that: The inner wall of the water storage cylinder (24) is provided with a slide groove (255), and a sliding block (256) adapted to the slide groove (255) is fixedly mounted on the outer edge of the movable plate (251).

4. The heat exchanger for recovering waste heat from cooling water of hot-dip galvanizing steel pipe according to claim 3, characterized in that: The adjustment component (25) further comprises a micro electric telescopic rod (257) fixedly mounted on the outside of the moving disk (251), a limit gear (253) fixedly mounted on the sleeve (252) inside the moving disk (251), and an output end of the electric telescopic rod (257) passes through the moving disk (251) and is inserted between tooth grooves of the limit gear (253).

5. The heat exchanger for recovering waste heat from cooling water of hot-dip galvanizing steel pipe according to claim 4, characterized in that: A plurality of convex blocks (262) arranged in an annular manner and at equal intervals are fixedly mounted on the water delivery tray (261).

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