A waste heat recovery device

Abstract

The utility model relates to a waste heat recovery device, and especially relates to a waste heat recovery device. The waste heat recovery device comprises a heat exchange barrel, an air inlet pipe and an air outlet pipe fixedly installed on the heat exchange barrel and communicated with the inside of the heat exchange barrel, and a detachable barrel cover installed on the upper opening of the heat exchange barrel; a hollow shaft with a closed middle part is assembled in the heat exchange barrel, the upper end of the hollow shaft penetrates through the barrel cover and is rotationally connected with the barrel cover, the outer periphery of the hollow shaft is surrounded by a spiral heat exchange pipe, the upper and lower ends of the heat exchange pipe are respectively communicated with and fixedly connected with the inner cavities of the upper and lower ends of the hollow shaft, and the upper and lower ends of the heat exchange barrel are respectively connected with a water inlet pipe and a water outlet pipe. In the utility model, cold water is connected through the water inlet pipe and is in corresponding contact with high-temperature flue gas introduced through the air inlet pipe, hot water is discharged from the water outlet pipe and is matched with low-temperature flue gas to be discharged, and efficient heat exchange temperature difference is maintained throughout the process; the rotatable spiral heat exchange pipe not only enlarges the heat exchange area, but also breaks the gas-liquid laminar flow boundary layer and increases disturbance, so that the waste heat recovery efficiency is doubled.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to a waste heat recovery device. Background Technology

[0002] In industrial production (such as chemical reactions, metallurgical smelting, and boiler combustion) and energy utilization, high-temperature flue gas, as a common production byproduct, carries a large amount of waste heat but is often directly emitted, which not only causes serious energy waste but also exacerbates environmental thermal pollution. In order to recover this waste heat, various waste heat recovery devices have emerged in existing technologies.

[0003] In some existing waste heat recovery devices, the heat exchange tubes are mostly fixed straight tubes or simple coil structures, with limited heat exchange area. Furthermore, the gas and liquid tend to form a stable laminar boundary layer during the flow process, resulting in high heat transfer resistance and insufficient fluid disturbance, which reduces the heat exchange effect.

[0004] Therefore, it is necessary to provide a new waste heat recovery device to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a new waste heat recovery device.

[0006] The waste heat recovery device provided by this utility model includes: a heat exchange tank, on which an air inlet pipe and an air outlet pipe communicating with the interior are fixedly installed, and a detachable tank cover is installed at the upper opening of the heat exchange tank.

[0007] The heat exchange tank is equipped with a centrally closed hollow shaft, the upper end of which passes through the tank cover and is rotatably connected to it. A spiral heat exchange tube surrounds the outer circumference of the hollow shaft, and the upper and lower ends of the heat exchange tube are respectively connected to and fixedly connected to the upper and lower cavities of the hollow shaft. The upper and lower ends of the heat exchange tank are respectively connected to an inlet pipe and an outlet pipe, which are respectively connected to and rotatably connected to the upper and lower ends of the hollow shaft. An air inlet pipe and an air outlet pipe are respectively located near the inlet pipe and the outlet pipe. A drive component for rotating the hollow shaft is installed on the tank cover.

[0008] Preferably, heat exchange strips are fixedly installed on the heat exchange tube.

[0009] Preferably, the bottom of the heat exchange tank is rotatably connected to a lower connecting cylinder extending to the bottom of the heat exchange tank, and an upper connecting cylinder fixedly connected to the lower end of the hollow shaft is inserted on the lower connecting cylinder. A rotating cylinder is rotatably connected below the lower connecting cylinder, and the lower part of the rotating cylinder is connected to the water outlet pipe. The water outlet pipe forms a communication channel with the inner cavity of the lower end of the hollow shaft through the rotating cylinder, the lower connecting cylinder, and the upper connecting cylinder.

[0010] Preferably, a support frame that is fixedly connected to the rotating drum is installed at the lower end of the heat exchange tank.

[0011] Preferably, a sealing strip is installed on the annular wall where the upper and lower connecting cylinders meet.

[0012] Preferably, the inlet pipe and outlet pipe are symmetrically distributed and both have an L-shaped structure. The vertical sections of the inlet pipe and outlet pipe are fitted with telescopic sliding pipes, and the other end of each sliding pipe is rotatably connected to a connecting cylinder. The two connecting cylinders are respectively fitted onto the upper end of the hollow shaft and the lower end of the rotating cylinder, and the two connecting cylinders are fixedly connected to the upper end of the hollow shaft and the lower end of the rotating cylinder by bolts.

[0013] Preferably, the driving component includes two drive wheels, one of which is fixedly sleeved on the hollow shaft, and the other drive wheel is rotatably connected to the bucket lid. A belt is sleeved between the two drive wheels, and the two drive wheels are connected by the belt drive. A mounting bracket is fixedly installed on the bucket lid, and a drive motor is fixedly installed on the mounting bracket. One of the drive wheels rotatably connected to the bucket lid is fixedly connected to the output end of the drive motor.

[0014] Preferably, an annular sealing gasket is fixedly installed on the inner wall of the barrel lid, and the upper end of the heat exchange barrel is abutted against the annular sealing gasket.

[0015] Compared with related technologies, the waste heat recovery device provided by this utility model has the following beneficial effects:

[0016] In this invention, cold water enters through the inlet pipe, corresponding to the high-temperature flue gas that has just entered the heat exchange tank, while hot water exits through the outlet pipe, corresponding to the low-temperature flue gas that is about to be discharged. This maintains a high-efficiency heat exchange temperature difference between the gas and liquid throughout the process, improving the waste heat recovery efficiency. At the same time, by setting a heat exchange tube with a rotatable spiral structure, the spiral structure expands the heat exchange area, and the rotation breaks the gas-liquid laminar boundary layer and increases fluid disturbance, further improving the heat exchange efficiency. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the waste heat recovery device provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the internal structure of the heat exchange tank.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the bottom of the heat exchange tank.

[0020] Figure 4 for Figure 1 The diagram shown illustrates the structure of the bucket lid.

[0021] Figure 5 for Figure 2 The diagram shows the structure of the hollow shaft;

[0022] Figure 6 for Figure 5 The diagram shows a half-sectional view of the upper connecting cylinder.

[0023] Figure 7 for Figure 1 The diagram shows the structure of the water inlet pipe.

[0024] The following are the labels in the diagram: 1. Heat exchange tank; 11. Inlet pipe; 12. Outlet pipe; 13. Tank lid; 2. Hollow shaft; 21. Heat exchange tube; 211. Heat exchange bar; 3. Water inlet pipe; 31. Sliding tube; 32. Connecting cylinder; 4. Water outlet pipe; 41. Rotating drum; 421. Support frame; 42. Lower connecting cylinder; 43. Upper connecting cylinder; 431. Sealing strip; 5. Mounting frame; 51. Transmission wheel; 52. Belt; 53. Drive motor. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0027] Please see Figures 1 to 7 This utility model provides a waste heat recovery device, which includes: a heat exchange tank 1, an inlet pipe 11 and an outlet pipe 12 fixedly installed on the heat exchange tank 1 and communicating with its interior, and a detachable tank cover 13 installed at the upper opening of the heat exchange tank 1; a hollow shaft 2 with a closed center is assembled inside the heat exchange tank 1, and the upper end of the hollow shaft 2 passes through the tank cover 13 and is rotatably connected to it; a spiral heat exchange tube 21 is surrounded around the hollow shaft 2, and the upper and lower ends of the heat exchange tube 21 are respectively connected to the upper and lower cavities of the hollow shaft 2 and are fixedly connected to it; an inlet pipe 3 and an outlet pipe 4 are respectively connected to the upper and lower ends of the heat exchange tank 1, and the inlet pipe 3 and the outlet pipe 4 are respectively connected to the upper and lower ends of the hollow shaft 2 and are rotatably connected to it; the inlet pipe 11 and the outlet pipe 12 are respectively located close to the inlet pipe 3 and the outlet pipe 4; and a driving component for rotating the hollow shaft 2 is installed on the tank cover 13.

[0028] It should be noted that: before and after heat exchange, the installation status of each sealing component in this utility model needs to be checked to ensure there is no risk of leakage; the lid 13 is removable, which facilitates the maintenance of the internal components of the heat exchange tank 1; during use, the gas containing residual heat enters the heat exchange tank 1 through the inlet pipe 11 and flows from top to bottom along the inner cavity of the heat exchange tank 1; cold water is injected into the upper inner cavity of the hollow shaft 2 through the water inlet pipe 3; the driving component drives the hollow shaft 2 and the heat exchange tube 21 with its outer spiral structure to rotate around its own axis; the cold water in the inner cavity of the hollow shaft 2 enters the spiral heat exchange tube 21; the rotating heat exchange tube 21 comes into full contact with the residual heat gas in the heat exchange tank 1; and the heat is transferred to the cold water through the tube wall of the heat exchange tube 21, thus raising the temperature of the cold water. (Waste heat recovery) After absorbing heat, the hot water flows back to the lower end of the hollow shaft 2 through the heat exchange tube 21 and is discharged through the water outlet 4; the low-temperature gas after heat exchange is discharged from the gas outlet 12, realizing continuous gas-liquid circulation heat exchange; in this utility model, cold water enters from the water inlet pipe 3 (low-temperature end) and contacts the high-temperature flue gas that has just entered the heat exchange tank 1 (inlet pipe 11 side), while hot water is discharged from the water outlet pipe 4 (high-temperature end) and contacts the low-temperature flue gas that is about to be discharged (outlet pipe 12 side). The entire process maintains an efficient heat exchange temperature difference between gas and liquid, improving the waste heat recovery efficiency. At the same time, by setting a rotatable spiral structure heat exchange tube 21, the spiral structure expands the heat exchange area, and the rotation action breaks the gas-liquid laminar boundary layer and increases fluid disturbance, further improving the heat exchange efficiency.

[0029] Among them, heat exchange strips 211 are fixedly installed on heat exchange tube 21; an extended contact structure is added to the heat exchange tube 21 to accelerate heat transfer.

[0030] It should be noted that: the bottom of the heat exchange tank 1 is rotatably connected to a lower connecting cylinder 42 extending below the heat exchange tank 1, and an upper connecting cylinder 43 is inserted into the lower connecting cylinder 42 and fixedly connected to the lower end of the hollow shaft 2. A rotating cylinder 41 is rotatably connected below the lower connecting cylinder 42, and the lower part of the rotating cylinder 41 is connected to the water outlet pipe 4. The water outlet pipe 4 forms a communication channel with the lower end cavity of the hollow shaft 2 through the rotating cylinder 41, the lower connecting cylinder 42, and the upper connecting cylinder 43. The lower end of the hollow shaft 2 is fixedly connected to the upper connecting cylinder 43 and inserted into the lower connecting cylinder 42, which, together with the rotating cylinder 41, connects to the water outlet pipe 4 to form a hot water discharge channel. The lower connecting cylinder 42 is rotatably connected to the heat exchange tank 1, and the lower connecting cylinder 42 is also rotatably connected to the rotating cylinder 41, ensuring that the hollow shaft 2 can rotate while hot water is discharged.

[0031] Furthermore, a support frame 421 is fixedly installed at the lower end of the heat exchange tank 1 and is fixedly connected to the rotating cylinder 41. The support frame 421 is fixedly installed at the lower end of the heat exchange tank 1 and is rigidly connected to the rotating cylinder 41, forming a fixed support for the rotating cylinder 41, offsetting the radial and axial forces generated by the rotation of the hollow shaft 2 and the heat exchange tube 21, preventing the rotating cylinder 41 from shifting, and ensuring the stable rotation of the hollow shaft 2.

[0032] Furthermore, a sealing strip 431 is installed on the annular wall where the upper connecting cylinder 43 and the lower connecting cylinder 42 meet; this fills the assembly gap between the upper connecting cylinder 43 and the lower connecting cylinder 42, preventing hot water in the hollow shaft 2 or flue gas in the heat exchange tank 1 from leaking from the connection point, thus avoiding energy loss and safety hazards.

[0033] In addition, the inlet pipe 3 and outlet pipe 4 are symmetrically distributed and both have an L-shaped structure. The vertical sections of the inlet pipe 3 and outlet pipe 4 are fitted with telescopic slide tubes 31, and the other end of each slide tube 31 is rotatably connected to a connecting cylinder 32. The two connecting cylinders 32 are respectively fitted onto the upper end of the hollow shaft 2 and the lower end of the rotating cylinder 41, and the two connecting cylinders 32 are fixedly connected to the upper end of the hollow shaft 2 and the lower end of the rotating cylinder 41 by bolts. The rotational connection characteristic of the connecting cylinder 32, combined with the telescopic function of the slide tube 31, satisfies the rotational movement of the hollow shaft 2 and the rotating cylinder 41, avoids pipe twisting and damage, and the bolt fixation ensures the reliability of the connection, so that the inlet pipe 3 and outlet pipe 4 can be separated from the upper end of the hollow shaft 2 and the lower end of the rotating cylinder 41, respectively, which facilitates their assembly.

[0034] It is worth noting that the driving component includes two drive wheels 51. One drive wheel 51 is fixedly sleeved on the hollow shaft 2, and the other drive wheel 51 is rotatably connected to the lid 13. A belt 52 is sleeved between the two drive wheels 51, and the two drive wheels 51 are connected by the belt 52. A mounting bracket 5 is fixedly installed on the lid 13, and a drive motor 53 is fixedly installed on the mounting bracket 5. One of the drive wheels 51 rotatably connected to the lid 13 is fixedly connected to the output end of the drive motor 53. The mounting bracket 5 is used to install the drive motor 53 and to keep the drive motor 53 away from the lid 13 to avoid damage to the drive motor 53 due to high temperature. The drive motor 53 drives one of the drive wheels 51 to rotate, and the belt 52 drives the drive wheel 51 fixedly sleeved on the hollow shaft 2 to rotate, thereby realizing the synchronous rotation of the hollow shaft 2 and the outer spiral heat exchange tube 21.

[0035] An annular sealing gasket is fixedly installed on the inner wall of the barrel cover 13, and the upper end of the heat exchange barrel 1 is abutted against the annular sealing gasket; this fills the assembly gap between the barrel cover 13 and the heat exchange barrel 1, preventing high-temperature flue gas or condensate in the heat exchange barrel 1 from leaking from the upper opening, thus avoiding energy loss and safety hazards.

[0036] It is worth noting that: to protect the drive motor 53 (a YS7124 three-phase asynchronous motor can be selected, which has a compact structure, good high temperature resistance, and can buffer load impact through belt drive, resulting in low maintenance costs), a protective cover can be installed on it; the drive component is equipped with a variable frequency speed control module, which can adjust the speed of the drive motor 53 in real time according to the flue gas temperature and flow rate of the intake pipe 11. It can run at low speed to save energy when the temperature and flow rate are low, and rotate at high speed to enhance heat exchange when the temperature and flow rate are high, thus achieving dynamic adaptation; a drain port (with a shut-off valve) is added to the bottom of the heat exchange tank 1, and a transparent observation window is opened on the tank wall to periodically discharge internal condensate and dust, while facilitating real-time observation of the internal heat exchange status. Basic cleaning can be completed without removing the tank cover 13; The heat exchange tank 1 is wrapped with a high-temperature resistant insulation layer (using a rock wool + aluminum foil composite structure) to reduce heat loss and further improve waste heat recovery efficiency. At the same time, it lowers the surface temperature of the tank to prevent burns. A thermostatic diversion valve is added to the water outlet pipe 4, which can adjust the hot water output temperature according to user needs, adapting to different scenarios such as heating and hot water supply, and improving the versatility of the device. The diversion valve is linked with the temperature sensor to achieve automatic thermostatic control. Temperature and pressure sensors are installed on the water inlet pipe 3, water outlet pipe 4, air inlet pipe 11, and air outlet pipe 12, respectively. The sensor data is connected to the intelligent control module to display the temperature difference and pressure changes before and after heat exchange in real time. When the parameters are abnormal, an alarm is automatically triggered to facilitate timely troubleshooting.

[0037] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A waste heat recovery device, comprising a heat exchange tank (1), characterized in that: The heat exchange tank (1) is fixedly installed with an air inlet pipe (11) and an air outlet pipe (12) communicating with its interior. A detachable tank cover (13) is installed at the upper opening of the heat exchange tank (1). The heat exchange tank (1) is equipped with a hollow shaft (2) with a closed center. The upper end of the hollow shaft (2) passes through the tank cover (13) and is rotatably connected to it. The hollow shaft (2) is surrounded by a spiral heat exchange tube (21). The upper and lower ends of the heat exchange tube (21) are respectively connected to the inner cavities of the upper and lower ends of the hollow shaft (2) and are fixedly connected to it. The upper and lower ends of the heat exchange tank (1) are respectively connected to a water inlet pipe (3) and a water outlet pipe (4). The water inlet pipe (3) and the water outlet pipe (4) are respectively connected to the upper and lower ends of the hollow shaft (2) and are rotatably connected to it. The air inlet pipe (11) and the air outlet pipe (12) are respectively located close to the water inlet pipe (3) and the water outlet pipe (4). The tank cover (13) is equipped with a drive component for rotating the hollow shaft (2).

2. The waste heat recovery device according to claim 1, characterized in that, A heat exchange strip (211) is fixedly installed on the heat exchange tube (21).

3. The waste heat recovery device according to claim 1, characterized in that, The bottom of the heat exchange tank (1) is rotatably connected to a lower connecting cylinder (42) extending below the heat exchange tank (1), and an upper connecting cylinder (43) fixedly connected to the lower end of the hollow shaft (2) is inserted on the lower connecting cylinder (42). A rotating cylinder (41) is rotatably connected below the lower connecting cylinder (42), and the lower part of the rotating cylinder (41) is connected to the water outlet pipe (4). The water outlet pipe (4) forms a communication channel with the inner cavity of the lower end of the hollow shaft (2) through the rotating cylinder (41), the lower connecting cylinder (42), and the upper connecting cylinder (43).

4. The waste heat recovery device according to claim 3, characterized in that, The lower end of the heat exchange tank (1) is fixedly installed with a support frame (421) that is fixedly connected to the rotating drum (41).

5. The waste heat recovery device according to claim 3, characterized in that, A sealing strip (431) is installed on the annular wall where the upper connecting cylinder (43) and the lower connecting cylinder (42) connect.

6. The waste heat recovery device according to claim 3, characterized in that, The inlet pipe (3) and outlet pipe (4) are symmetrically distributed and both have an L-shaped structure. The vertical sections of the inlet pipe (3) and outlet pipe (4) are fitted with retractable sliding pipes (31), and the other end of the sliding pipes (31) is rotatably connected to a connecting cylinder (32). The two connecting cylinders (32) are respectively fitted on the upper end of the hollow shaft (2) and the lower end of the rotating cylinder (41), and the two connecting cylinders (32) are respectively fixedly connected to the upper end of the hollow shaft (2) and the lower end of the rotating cylinder (41) by bolts.

7. The waste heat recovery device according to claim 1, characterized in that, The driving component includes two drive wheels (51), one of which is fixedly sleeved on the hollow shaft (2), and the other drive wheel (51) is rotatably connected to the bucket lid (13). A belt (52) is sleeved between the two drive wheels (51), and the two drive wheels (51) are connected by the belt (52). A mounting bracket (5) is fixedly installed on the bucket lid (13), and a drive motor (53) is fixedly installed on the mounting bracket (5). One of the drive wheels (51) rotatably connected to the bucket lid (13) is fixedly connected to the output end of the drive motor (53).

8. The waste heat recovery device according to claim 1, characterized in that, An annular sealing gasket is fixedly installed on the inner wall of the barrel cover (13), and the upper end of the heat exchange barrel (1) is abutted against the annular sealing gasket.

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