Furnace body exhaust gas waste heat recovery heat exchanger

Abstract

This utility model relates to the field of heat exchanger technology and discloses a furnace exhaust gas waste heat recovery heat exchanger, including a shell, a heat transfer tube bundle disposed inside the shell, a tube box disposed on the side wall of the shell, a base plate disposed at the bottom of the shell, a quick-release assembly disposed on the side wall of the shell, and a lifting assembly disposed at the bottom of the shell. The quick-release assembly includes a limiting block and a sliding plate. The bottom of the limiting block is fixedly connected to the side wall of the shell, and the bottom of the sliding plate is fixedly connected to the side wall of the tube box. The side wall of the sliding plate is slidably connected to the inside of the limiting block. This utility model, while ensuring sealing, allows for quick disassembly of the tube box for maintenance and cleaning of the internal heat transfer tube bundle, solving the problem of severe pollution of the heat transfer tubes by furnace exhaust gas and the inconvenience of cleaning each time.

Description

Technical Field

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

[0002] In industrial production, the high-temperature exhaust gas emitted during the operation of furnaces (such as boilers and kilns) contains a large amount of waste heat. Direct emission not only wastes energy but also exacerbates thermal pollution. As a key energy-saving device, the furnace exhaust gas waste heat recovery heat exchanger can recover and utilize waste heat by transferring the heat of the exhaust gas to a liquid medium (such as water or thermal oil). It is widely used in industries such as power, chemical, and metallurgy. With the advancement of the "dual carbon" target, the requirements for such heat exchangers are increasing in terms of high-efficiency heat exchange performance, convenient maintenance, and environmental adaptability. Especially in scenarios where frequent maintenance and cleaning of internal heat transfer tube bundles are required, the rationality of the structural design directly affects the operating efficiency and energy consumption level of the equipment.

[0003] In existing furnace waste heat recovery heat exchangers, the shell and tube box are typically connected by flanges. The tube box is fixed to the side wall of the shell by multiple bolts, and the internal heat transfer tube bundle and the tube box form a waste gas flow channel. The sealing relies on a single sealing ring on the flange face. When the equipment is running, high-temperature waste gas is introduced from the inlet pipe of the tube box, releases heat on the outside of the heat transfer tube bundle, and is discharged. The liquid medium flows in from the liquid inlet pipe of the shell, absorbs heat inside the tube bundle, and is then output. The technical principle of this type of structure is based on the thermal conductivity of metal tube bundles. The heat exchange efficiency is improved by increasing the surface area of ​​the tube bundle. However, it faces periodic maintenance requirements in long-term use, such as cleaning the dust on the surface of the tube bundle and replacing aged seals.

[0004] However, traditional flange connection structures have significant disassembly inconveniences: each maintenance requires the use of tools to remove multiple bolts one by one, which is time-consuming and the bolts are prone to corrosion due to high temperatures, making disassembly difficult; the sealing gaskets on the flange face are prone to deformation after repeated disassembly and assembly, resulting in increased exhaust gas leakage rate, which not only affects heat exchange efficiency but also causes environmental pollution; in addition, the rigid connection between the pipe box and the shell means that the alignment of the two depends on manual measurement, and the installation accuracy is greatly affected by the operator's experience, often leading to sealing failure due to positioning deviation, which seriously restricts the maintenance efficiency and operational reliability of the equipment. Therefore, a furnace exhaust gas waste heat recovery heat exchanger is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a furnace exhaust gas waste heat recovery heat exchanger, which aims to improve the existing technology where multiple bolts need to be disassembled one by one with tools during each maintenance, the disassembly time is long, and the bolts are prone to corrosion due to high temperature, making disassembly difficult.

[0006] To achieve the above objectives, the waste heat recovery heat exchanger for furnace exhaust gas provided in this embodiment of the utility model includes a shell, a heat transfer tube bundle disposed inside the shell, a tube box disposed on the side wall of the shell, a base plate disposed at the bottom of the shell, a quick-release assembly disposed on the side wall of the shell, and a lifting assembly disposed at the bottom of the shell. The quick-release assembly includes a limiting block one and a sliding plate two. The bottom of the limiting block one is fixedly connected to the side wall of the shell, the bottom of the sliding plate two is fixedly connected to the side wall of the tube box, and the side wall of the sliding plate two is slidably connected to the inside of the limiting block one. The sliding plate one is fixedly connected to the side wall of the shell, the limiting block two is fixedly connected to the side wall of the tube box, and the side wall of the sliding plate two is slidably connected to the inside of the limiting block two. A connecting cylinder is fixedly connected inside the tube box, and the connecting cylinder is slidably connected inside the shell.

[0007] Optionally, the lifting assembly includes a movable seat and a screw. A motor is fixedly connected to the top of the base plate, a transmission rod is fixedly connected to the output end of the motor, a bevel gear is fixedly connected to the side wall of the transmission rod, a protective seat is fixedly connected to the top of the base plate, the side wall of the screw is rotatably connected inside the protective seat, a bevel gear is fixedly connected to the bottom of the protective seat, the bevel gear and the bevel gear are meshed, and the movable seat is internally threaded to the side wall of the screw.

[0008] Optionally, the sidewall of the housing is fixedly connected to the inside of the movable seat, and a baffle plate is fixedly connected inside the movable seat, with the baffle plate positioned directly above the screw.

[0009] Optionally, a support column is fixedly connected to the top of the base plate, and the movable seat is slidably connected to the side wall of the support column.

[0010] Optionally, a slider is slidably connected inside the housing, and a spring is provided inside the housing, with one end of the spring fixedly connected inside the housing and the other end of the spring fixedly connected to the bottom of the slider.

[0011] Optionally, the connecting cylinder has a groove inside, the slider sidewall is slidably connected inside the groove, and the tube box sidewall is fixedly connected to a handle.

[0012] Optionally, an inner sealing ring is fixedly connected inside the housing, the side wall of the connecting cylinder is in contact with the side wall of the inner sealing ring, an outer sealing ring is fixedly connected to the side wall of the housing, and the side wall of the pipe box is in contact with the side wall of the outer sealing ring.

[0013] Optionally, a liquid inlet pipe is fixedly connected inside the housing, a liquid outlet pipe is fixedly connected inside the housing, an air inlet pipe is fixedly connected inside the pipe box, and an air outlet pipe is fixedly connected inside the pipe box.

[0014] The above-mentioned technical solutions in the furnace waste gas waste heat recovery heat exchanger provided in this embodiment of the utility model have at least one of the following technical effects:

[0015] 1. In this utility model, the tube box can be quickly disassembled by sliding the limiting block and the sliding plate. The cooperation between the connecting cylinder and the slider achieves quick disassembly while ensuring a sealing effect. This solves the problem that the traditional radiator tube box and shell are connected by flanges, making disassembly inconvenient when the internal heat transfer tube bundle needs to be maintained and cleaned. This improves the convenience of the equipment.

[0016] 2. In this utility model, the transmission rod is driven by a motor, which causes the moving seat to rise with the screw, so that the heat exchanger can be raised to different heights depending on the connection facilities, shortening the length of the connecting pipe and reducing heat loss. This solves the problem that the traditional heat exchanger base is fixed and inconvenient to connect with furnaces of different heights, thus improving the versatility of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the furnace exhaust gas waste heat recovery heat exchanger proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the heat transfer tube bundle of the furnace exhaust gas waste heat recovery heat exchanger proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the tube box structure of the furnace exhaust gas waste heat recovery heat exchanger proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the quick-connect assembly of the furnace exhaust gas waste heat recovery heat exchanger proposed in this utility model;

[0022] Figure 5 This utility model presents a schematic diagram of the lifting assembly of the furnace exhaust gas waste heat recovery heat exchanger.

[0023] The following are the labeling elements in the figure:

[0024] 1. Shell; 2. Movable base; 3. Tube box; 4. Base plate; 5. Air inlet pipe; 6. Liquid inlet pipe; 7. Air outlet pipe; 8. Liquid outlet pipe; 9. Heat transfer tube bundle; 10. Sliding plate one; 11. Limiting block one; 12. Sliding plate two; 13. Limiting block two; 14. Groove; 15. Handle; 16. Inner sealing ring; 17. Spring; 18. Slider; 19. Outer sealing ring; 20. Baffle plate; 21. Motor; 22. Transmission rod; 23. Bevel gear one; 24. Bevel gear two; 25. Screw; 26. Protective base; 27. Support column; 28. Connecting cylinder. Detailed Implementation

[0025] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0026] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0027] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0029] Reference Figures 1-4This utility model provides an embodiment of a furnace exhaust gas waste heat recovery heat exchanger, including a shell 1. A heat transfer tube bundle 9, composed of multiple heat-conducting metal tubes, is installed inside the shell 1 to provide a heat exchange interface between the exhaust gas and the liquid. Heat is conducted through the tube walls to achieve the effect of recovering the waste heat of the furnace exhaust gas and heating the liquid medium. Further details are omitted here. A tube box 3 is installed on the side wall of the shell 1, and a base plate 4 is installed at the bottom of the shell 1. A quick-release assembly is installed on the side wall of the shell 1, and a lifting assembly is installed at the bottom of the shell 1. The quick-release assembly includes a limiting block 11 and a sliding plate 12. The bottom of the limiting block 11 is fixedly connected to the side wall of the shell 1 to form a vertical sliding track, providing guidance for the sliding plate 12, allowing the tube box 3 to move along the shell 1. The sidewall slides up and down to achieve rapid positioning. The bottom of sliding plate 212 is fixed to the sidewall of pipe box 3, and the sidewall is slidably connected to the inside of limit block 11. It slides vertically with limit block 11 to ensure the stability of pipe box 3 during disassembly and installation. Sliding plate 10 is fixed to the sidewall of shell 1, and limit block 213 is fixed to the sidewall of pipe box 3. The sidewall of sliding plate 10 is slidably connected to the inside of limit block 213. The two together form a horizontal sliding guide, which, together with limit block 11 and sliding plate 212, constitutes a two-way limiting structure to ensure the positional accuracy of pipe box 3 when connected to shell 1. A connecting cylinder 28 is fixedly connected inside pipe box 3. The connecting cylinder 28 is slidably connected inside shell 1 to seal the connection between pipe box 3 and shell 1. The gas passage of body 1 ensures that exhaust gas enters the interior of housing 1 through connecting cylinder 28 and contacts the heat transfer tube bundle 9. A slider 18 is slidably connected inside housing 1, and a spring 17 is installed inside housing 1. One end of spring 17 is fixedly connected inside housing 1, and the other end of spring 17 is fixedly connected to the bottom of slider 18. The two work together to form an elastic clamping structure. A groove 14 is opened inside connecting cylinder 28, and the side wall of slider 18 is slidably connected inside groove 14. When tube box 3 slides into place, slider 18 is locked into groove 14 of connecting cylinder 28 under the elastic force of spring 17, fixing the position of tube box 3. To disassemble, press slider 18 to compress spring 17 to release the lock, achieving a quick disassembly and assembly effect. Handle 15 is fixed to the side wall of tube box 3. The inner sealing ring 16 is fixed inside the housing 1, and the side wall of the connecting cylinder 28 is in contact with the inner sealing ring 16. The outer sealing ring 19 is fixed to the side wall of the housing 1, and the side wall of the pipe box 3 is in contact with the outer sealing ring 19. Both are made of rubber and are used to isolate the gap between the housing 1 and the pipe box 3 to prevent exhaust gas leakage. This is common knowledge and will not be elaborated on here. The housing 1 is fixedly connected to the liquid inlet pipe 6 and the liquid outlet pipe 8. The pipe box 3 is fixedly connected to the air inlet pipe 5 and the air outlet pipe 7. These are used to introduce high-temperature exhaust gas and discharge cooled exhaust gas, which together form a medium channel for heat exchange.

[0030] Reference Figure 1 and Figure 5The lifting assembly includes a movable base 2 and a screw 25. A motor 21 is fixedly connected to the top of the base plate 4, and a transmission rod 22 is fixedly connected to the output end of the motor 21 to convert electrical energy into mechanical energy, driving the transmission rod 22 to rotate and provide lifting power. A bevel gear 23 is fixedly connected to the side wall of the transmission rod 22. A protective seat 26 is fixedly connected to the top of the base plate 4. The side wall of the screw 25 is rotatably connected inside the protective seat 26. A bevel gear 24 is fixedly connected to the bottom of the protective seat 26. The bevel gear 23 and the bevel gear 24 are meshed, working together with the protective seat 26 to support the rotation of the screw 25, thus lifting the screw 25. The horizontal rotation of the moving rod 22 is converted into the vertical rotation of the screw 25, realizing the conversion of the power direction. The moving seat 2 is internally threaded to the side wall of the screw 25. The side wall of the housing 1 is fixedly connected to the inside of the moving seat 2. A baffle plate 20 is fixedly connected inside the moving seat 2. The baffle plate 20 is located directly above the screw 25 to limit the axial displacement of the screw 25. A support column 27 is fixedly connected to the top of the base plate 4. The moving seat 2 is internally slidably connected to the side wall of the support column 27 to provide vertical support and guidance, prevent the moving seat 2 from tilting when it is raised or lowered, and ensure the smooth movement of the housing 1.

[0031] Working principle: The high-temperature exhaust gas generated by the furnace enters the heat exchanger through the inlet pipe 5 inside the tube box 3, flows along the inside of the tube box 3 and enters the connecting cylinder 28, and finally enters the heat transfer tube bundle 9 inside the shell 1. At the same time, the liquid for heat recovery flows in from the liquid inlet pipe 6 inside the shell 1 and flows around the heat transfer tube bundle 9 inside the shell 1. Due to the presence of the heat transfer tube bundle 9, the high-temperature exhaust gas and the liquid exchange heat through the tube wall. The heat of the exhaust gas is transferred to the liquid, causing the liquid temperature to rise, thus realizing waste heat recovery. The cooled exhaust gas is collected through the heat transfer tube bundle 9 and discharged through the outlet pipe 7. The heated liquid flows out from the outlet pipe 8 for subsequent use. When maintenance is required on the tube box 3 or its internal components, the operator applies external force by holding the handle 15, causing the tube box 3 to move. At this time, the sliding plate 12 fixed to the side wall of the tube box 3 slides inside the limiting block 11, and the sliding plate 10 slides inside the limiting block 13, realizing the relative sliding between the tube box 3 and the housing 1. The connecting cylinder 28 gradually slides out from inside the housing 1. During this process, the slider 18 inside the housing 1 slides in the groove 14 of the connecting cylinder 28, and the spring 17 acts as a buffer and positioning element. When the slider 18 slides out of the groove 14, the tube box 3 and the housing 1 can be completely separated. During installation, the operation is reversed. The connecting cylinder 28 is inserted into the housing 1, and the slider 18 is engaged in the groove 14 under the elastic force of the spring 17. At the same time, the side wall of the tube box 3 is in contact with the outer sealing ring 19, and the side wall of the connecting cylinder 28 is in contact with the inner sealing ring 16, ensuring sealing performance and preventing gas and liquid leakage. When it is necessary to adjust the height of the housing 1 to adapt to different working conditions, the motor 21 on the top of the base plate 4 is started. The output end of the motor 21 drives the transmission rod 22 to rotate, and the bevel gear 23 on the side wall of the transmission rod 22 rotates accordingly. When rotated, bevel gear 23 meshes with bevel gear 24, causing screw 25 to rotate inside protective seat 26. Since the inside of movable seat 2 is threadedly connected to the side wall of screw 25, the rotation of screw 25 is converted into the up and down movement of movable seat 2. Movable seat 2 is slidably connected to the side wall of support column 27. Support column 27 plays a guiding and stabilizing role, ensuring that movable seat 2 rises and falls smoothly. The side wall of housing 1 is fixed inside movable seat 2, thereby realizing the adjustment of the height of housing 1. The baffle plate 20 is set directly above screw 25 to prevent movable seat 2 from moving excessively and play a limiting protection role.

[0032] The rest of this embodiment is the same as that in Embodiment 1. Features not explained in this embodiment are explained using the methods in Embodiment 1, and will not be repeated here.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A furnace exhaust gas waste heat recovery heat exchanger, comprising a shell (1), characterized in that: The shell (1) is provided with a heat transfer tube bundle (9) inside, a tube box (3) is provided on the side wall of the shell (1), a bottom plate (4) is provided at the bottom of the shell (1), a quick-release assembly is provided on the side wall of the shell (1), and a lifting assembly is provided at the bottom of the shell (1). The quick-release assembly includes a limiting block one (11) and a sliding plate two (12). The bottom of the limiting block one (11) is fixedly connected to the side wall of the housing (1). The bottom of the sliding plate two (12) is fixedly connected to the side wall of the tube box (3). The side wall of the sliding plate two (12) is slidably connected to the inside of the limiting block one (11). The side wall of the housing (1) is fixedly connected to the sliding plate one (10). The side wall of the tube box (3) is fixedly connected to the limiting block two (13). The side wall of the sliding plate one (10) is slidably connected to the inside of the limiting block two (13). The inside of the tube box (3) is fixedly connected to the connecting cylinder (28). The connecting cylinder (28) is slidably connected to the inside of the housing (1).

2. The furnace exhaust gas waste heat recovery heat exchanger according to claim 1, characterized in that: The lifting assembly includes a movable seat (2) and a screw (25). A motor (21) is fixedly connected to the top of the base plate (4). A transmission rod (22) is fixedly connected to the output end of the motor (21). A bevel gear (23) is fixedly connected to the side wall of the transmission rod (22). A protective seat (26) is fixedly connected to the top of the base plate (4). The side wall of the screw (25) is rotatably connected to the inside of the protective seat (26). A bevel gear (24) is fixedly connected to the bottom of the protective seat (26). The bevel gear (23) and the bevel gear (24) are meshed. The movable seat (2) is internally threaded to the side wall of the screw (25).

3. The furnace exhaust gas waste heat recovery heat exchanger according to claim 2, characterized in that: The side wall of the housing (1) is fixedly connected to the inside of the movable seat (2), and a baffle plate (20) is fixedly connected inside the movable seat (2). The baffle plate (20) is located directly above the screw (25).

4. The furnace exhaust gas waste heat recovery heat exchanger according to claim 2, characterized in that: The base plate (4) is fixedly connected to the top of a support column (27), and the movable seat (2) is slidably connected to the side wall of the support column (27).

5. The furnace exhaust gas waste heat recovery heat exchanger according to claim 1, characterized in that: The housing (1) has a slider (18) slidably connected inside, and a spring (17) is provided inside the housing (1). One end of the spring (17) is fixedly connected inside the housing (1), and the other end of the spring (17) is fixedly connected to the bottom of the slider (18).

6. The furnace exhaust gas waste heat recovery heat exchanger according to claim 5, characterized in that: The connecting cylinder (28) has a groove (14) inside, the slider (18) is slidably connected to the side wall of the groove (14), and the tube box (3) is fixedly connected to the side wall of the tube box (3).

7. The furnace exhaust gas waste heat recovery heat exchanger according to claim 1, characterized in that: An inner sealing ring (16) is fixedly connected inside the housing (1), the side wall of the connecting cylinder (28) is in contact with the side wall of the inner sealing ring (16), an outer sealing ring (19) is fixedly connected to the side wall of the housing (1), and the side wall of the tube box (3) is in contact with the side wall of the outer sealing ring (19).

8. The furnace exhaust gas waste heat recovery heat exchanger according to claim 1, characterized in that: The housing (1) is fixedly connected to a liquid inlet pipe (6), the housing (1) is fixedly connected to a liquid outlet pipe (8), the pipe box (3) is fixedly connected to an air inlet pipe (5), and the pipe box (3) is fixedly connected to an air outlet pipe (7).

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