A waste heat recovery device for VOCs exhaust gas treatment

Abstract

This utility model discloses a waste heat recovery device for VOCs exhaust gas treatment, including a housing with an opening on one side and a detachable side plate. Two through holes are provided on the side wall of the housing opposite the detachable side plate, with an outlet pipe and an inlet pipe respectively fitted into the two through holes. An exhaust gas inlet is provided on the upper side wall of the housing adjacent to the outlet pipe, and an exhaust gas outlet is provided at the lower part of the vertical side wall of the housing adjacent to the inlet pipe. The outlet pipe and inlet pipe extend into the inner cavity of the housing and are connected by several heat exchange pipes. The opening on one side of the housing and the detachable side plate allow personnel to easily enter the housing for comprehensive inspection and cleaning without large-scale disassembly of the entire device, greatly improving cleaning efficiency and reducing maintenance costs. Furthermore, the way the outlet pipe is fitted to the housing ensures airtightness while facilitating the disassembly and maintenance of the heat exchange components.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, and specifically relates to a waste heat recovery device for VOCs waste gas treatment. Background Technology

[0002] VOCs are various organic compounds with boiling points ranging from 50°C to 260°C at room temperature. In my country, VOCs refer to organic compounds with a saturated vapor pressure greater than 70 Pa at room temperature and a boiling point below 260°C at normal pressure, or all organic compounds with a vapor pressure greater than or equal to 10 Pa at 20°C and exhibiting volatility. VOCs waste gas is mainly generated from waste gas emissions during the production processes of petroleum, chemical, and related industries, such as factory waste gas, light industrial waste gas, printing and dyeing waste gas, pharmaceutical waste gas, steel plant waste gas, machinery manufacturing waste gas, electronics plant waste gas, electroplating plant waste gas, and paint waste gas. They generally possess characteristics such as being flammable and explosive, toxic and harmful, and difficult to treat.

[0003] In the past, waste heat recovery devices using various spiral finned tubes were commonly used to recover heat from flue gas containing VOCs, transferring the heat to circulating water for utilization. However, because the flue gas contains a large amount of volatile organic compounds, which are in a gaseous state at high temperatures, a significant portion condenses into a liquid upon encountering the low-temperature heat exchanger wall after cooling. This complex liquid has a high viscosity and easily adheres to the surface of the finned tubes. With the accumulation of dust, it can turn into a sludge-like substance, severely clogging the gas flow channels, requiring frequent disassembly and cleaning of the heat exchanger.

[0004] However, the internal structure of existing waste heat recovery devices is difficult to disassemble and clean, which increases the labor and time costs significantly. Therefore, this application provides a waste heat recovery device for VOCs exhaust gas treatment, which aims to simplify the disassembly and cleaning process of the internal structure of the device. Utility Model Content

[0005] This invention provides a waste heat recovery device for VOCs waste gas treatment, aiming to solve the problems pointed out in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A waste heat recovery device for VOCs exhaust gas treatment includes: a housing with an opening on one side and a detachable side plate; two through holes on the side wall of the housing opposite to the detachable side plate, with an outlet pipe and an inlet pipe respectively fitted into the two through holes; an exhaust gas inlet on the upper side wall of the housing adjacent to the outlet pipe; and an exhaust gas outlet at the lower part of the vertical side wall of the housing adjacent to the inlet pipe; the outlet pipe and the inlet pipe extend into the inner cavity of the housing and are connected by several heat exchange pipes.

[0008] The outlet pipe has the same structure as the inlet pipe. The outlet pipe includes, from the outside to the inside of the housing, a connecting flange, an extension pipe, a clamping pipe, a contact plate, and a manifold. The clamping pipe is adapted to the through hole. The contact plate abuts against the inner wall of the housing. The contact plate has several threaded holes distributed around its circumference. The housing has mating holes that mate with the threaded holes. The threaded holes are threadedly connected to locking bolts through the mating holes. The manifold is connected to several heat exchange pipes.

[0009] Furthermore, a first sealing ring is fitted around the outer edge of the abutment plate adjacent to the box body, and a second sealing ring is fitted around the junction of the abutment plate and the snap-fit ​​tube.

[0010] Furthermore, the outer side wall of the through hole on the housing is concentrically provided with a mounting boss, and the mating hole is circumferentially distributed on the mounting boss.

[0011] Furthermore, the heat exchange tube is arranged in a serpentine bend, including several alternating vertical and horizontal tubes, and the outer wall of the vertical tubes that are not adjacent to the exhaust gas inlet and the exhaust gas outlet is fitted with fin assemblies.

[0012] Furthermore, the fin assembly includes: two symmetrically arranged semicircular sleeves, each semicircular sleeve having a plurality of heat exchange fins on its sidewall away from the vertical tube, and extension plates on both sides of the semicircular sleeves having a plurality of connection holes, the connection holes on the extension plates of the two semicircular sleeves corresponding to each other for use with bolt and nut assemblies.

[0013] Furthermore, several baffles are alternately arranged on the upper and lower side walls of the inner cavity of the box, and the baffles correspond to the bending direction of the heat exchange tube.

[0014] Furthermore, a slider is provided at the bottom of the baffle plate, and a groove that cooperates with the slider is provided on the inner cavity side wall of the box.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] 1. The waste heat recovery device for VOCs exhaust gas treatment described in this utility model has an opening on one side of the box and is equipped with a detachable side plate, which allows the staff to easily enter the box to conduct a comprehensive inspection and cleaning of the inside of the box without having to disassemble the entire device on a large scale, which greatly improves cleaning efficiency and reduces maintenance costs; and the way the water outlet pipe is connected to the box ensures sealing while facilitating the disassembly and maintenance of the heat exchange components.

[0017] 2. The waste heat recovery device for VOCs waste gas treatment described in this utility model has the waste gas inlet located on the upper side wall of the housing adjacent to the water outlet pipe, and the waste gas outlet located on the lower part of the vertical side wall adjacent to the water inlet pipe. This layout allows the waste gas to form a reasonable flow path within the housing, ensuring sufficient contact with the heat exchange tubes and extending the contact time between the waste gas and the heat exchange tubes, thereby improving the heat exchange effect and more effectively realizing the recovery of waste heat from the waste gas. Attached Figure Description

[0018] Figure 1 This is an overall isometric view of a waste heat recovery device for VOCs waste gas treatment according to the present invention;

[0019] Figure 2 This is an internal schematic diagram of a waste heat recovery device for VOCs waste gas treatment according to the present invention;

[0020] Figure 3 This is a schematic diagram of a heat exchange component of a waste heat recovery device for VOCs waste gas treatment according to the present invention.

[0021] Figure 4 This is a schematic diagram of the outlet pipe of a waste heat recovery device for VOCs waste gas treatment according to this utility model;

[0022] Figure 5 This is a schematic diagram of the water outlet pipe and the housing of a waste heat recovery device for VOCs waste gas treatment according to this utility model;

[0023] Figure 6 This is a schematic diagram of a finned assembly of a waste heat recovery device for VOCs waste gas treatment according to the present invention.

[0024] In the picture:

[0025] 1. Housing; 101. Exhaust gas inlet; 102. Exhaust gas outlet; 103. Mounting boss;

[0026] 2. Removable side panels;

[0027] 3. Outlet pipe; 301. Connecting flange; 302. Extension pipe; 303. Clip-on pipe; 304. Abutment plate; 305. Threaded hole; 306. Manifold; 307. First sealing ring; 308. Second sealing ring;

[0028] 4. Water inlet pipe;

[0029] 5. Heat exchanger tubes;

[0030] 6. Fin assembly; 601. Semicircular sleeve; 602. Heat exchange fins; 603. Extension plate; 604. Connection hole;

[0031] 7. Baffle plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments of this application and the accompanying drawings.

[0033] like Figure 1-5 As shown, a waste heat recovery device for VOCs waste gas treatment includes: a housing 1, with an opening on one side and a detachable side plate 2; two through holes on the side wall of the housing 1 opposite to the detachable side plate 2, with an outlet pipe 3 and an inlet pipe 4 respectively fitted into the two through holes; a waste gas inlet 101 is provided on the upper side wall of the housing 1 adjacent to the outlet pipe 3; a waste gas outlet 102 is provided at the lower part of the vertical side wall of the housing 1 adjacent to the inlet pipe 4; the outlet pipe 3 and the inlet pipe 4 extend into the inner cavity of the housing 1 and are connected by several heat exchange pipes 5;

[0034] The outlet pipe 3 has the same structure as the inlet pipe 4. The outlet pipe 3 includes, from the outside to the inside of the housing 1, a connecting flange 301, an extension pipe 302, a clamping pipe 303, an abutment plate 304, and a manifold 306. The clamping pipe 303 is adapted to the through hole. The abutment plate 304 abuts against the inner wall of the housing 1. The abutment plate 304 has several threaded holes 305 distributed around its circumference. The housing 1 has mating holes that mate with the threaded holes 305. The threaded holes 305 are threadedly connected to the locking bolts through the mating holes. The manifold 306 is connected to several heat exchange pipes 5.

[0035] The opening on one side of the housing 1 and the installation of a removable side panel 2 allow personnel to easily enter the interior of the housing 1 for comprehensive inspection and cleaning without requiring large-scale disassembly of the entire device, greatly improving cleaning efficiency and reducing maintenance costs. Furthermore, the way the water outlet pipe 3 is fitted to the housing 1 ensures airtightness while facilitating the disassembly and maintenance of the heat exchange components. The exhaust gas inlet 101 is located on the upper side wall of the housing adjacent to the water outlet pipe 3, and the exhaust gas outlet 102 is located on the lower part of the vertical side wall adjacent to the water inlet pipe 4. This layout allows the exhaust gas to form a reasonable flow path within the housing 1, ensuring sufficient contact with the heat exchange tubes 5, extending the contact time between the exhaust gas and the heat exchange tubes 5, thereby improving the heat exchange effect and more effectively recovering waste heat from the exhaust gas.

[0036] like Figure 4-5 As shown, a first sealing ring 307 is fitted around the outer edge of the abutment plate 304 adjacent to the plate surface of the housing 1, and a second sealing ring 308 is fitted around the junction of the abutment plate 304 and the clamping pipe 303.

[0037] During operation, high-temperature VOCs waste gas flows within the chamber. Without proper sealing, the waste gas may leak into the surrounding environment through the gap between the contact plate 304 and the chamber 1. This not only results in incomplete waste gas treatment and environmental pollution but may also pose a threat to the health of workers. The presence of the first sealing ring 307 and the second sealing ring 308 effectively prevents waste gas leakage, ensuring that the waste gas flows along a predetermined path within the chamber and completes the heat exchange process.

[0038] like Figure 1 and Figure 5 As shown, a mounting boss 103 is concentrically provided on the outer wall of the through hole on the housing 1, and the mating holes are circumferentially distributed on the mounting boss 103. The mounting boss 103 is equivalent to adding an extra connecting platform on the outside of the through hole of the housing 1. When the abutment plate 304 of the water outlet pipe 3 and the water inlet pipe 4 are connected to the mating hole on the mounting boss 103 by locking bolts, the mounting boss 103 can provide a mating surface, making the connection more stable. Compared with directly opening mating holes on the side wall of the housing 1 for connection, this method can disperse the stress borne by the connection part, avoid damage to the side wall of the housing 1 due to stress concentration, and ensure that the connection between the water outlet pipe 3 and the water inlet pipe 4 and the housing 1 is more reliable and will not easily loosen during the operation of the device.

[0039] like Figure 2-3 As shown, the heat exchange tube 5 is arranged in a serpentine bend, comprising several alternating vertical and horizontal tubes. The outer wall of the vertical tubes, which are not adjacent to the exhaust gas inlet 101 and the exhaust gas outlet 102, is fitted with finned assemblies 6. The serpentine bend of the heat exchange tube 5, composed of several alternating vertical and horizontal tubes, significantly increases the contact area between the heat exchange tube and the exhaust gas compared to ordinary straight tubes. When high-temperature VOCs exhaust gas flows within the chamber, it can make more thorough contact with the heat exchange tube 5, allowing the heat in the exhaust gas to be transferred more effectively to the water inside the heat exchange tube 5, improving heat exchange efficiency and thus more efficiently recovering waste heat from the exhaust gas. The serpentine bend structure causes turbulence in the exhaust gas during flow. This turbulence can disrupt the laminar boundary layer formed on the surface of the heat exchange tube 5, enhancing the turbulence of the fluid. In turbulent flow, heat transfer efficiency is higher because it allows heat from the exhaust gas to be transferred to the surface of the heat exchange tube 5 more quickly, and then to the water inside the tube, improving the heat transfer coefficient of the entire heat exchange process.

[0040] like Figure 6As shown, the fin assembly 6 includes: two symmetrically arranged semicircular sleeves 601, with a plurality of heat exchange fins 602 arranged on the sidewall of the semicircular sleeves 601 away from the vertical tube, and extension plates 603 arranged on both sides of the semicircular sleeves 601. A plurality of connecting holes 604 are provided on the extension plates 603, and the connecting holes 604 on the extension plates 603 of the two semicircular sleeves 601 correspond to each other and are used to cooperate with the bolt and nut assembly.

[0041] The fin assembly 6 consists of two symmetrically arranged semicircular sleeves 601, a design that simplifies installation. During installation, simply wrap the two semicircular sleeves 601 around the sides of the vertical tube, align the connecting holes 604 on the side extension plates 603, and then secure them using bolts and nuts. Compared to some integrated fin structures, this modular design significantly reduces installation difficulty, time, and labor costs. In the event of damage to the fin assembly 6 or the need for cleaning, replacement, or other maintenance, its modular structure allows for easy disassembly, enabling quick and efficient maintenance without disrupting the normal operation of the waste heat recovery device.

[0042] Furthermore, during use, the fin assembly 6 protects the surface of the heat exchange tube 5, preventing oil contamination from the exhaust gas. If oil adheres directly to the surface of the heat exchange tube 5, cleaning it becomes difficult due to the dense arrangement of the tubes, limiting cleaning options. The fin assembly 6, located outside the heat exchange tube 5, has a relatively independent structure, making cleaning much easier. The fin assembly can be periodically disassembled, cleaned, or replaced, thus maintaining its protective function for the heat exchange tube.

[0043] like Figure 2 As shown, several baffles 7 are alternately arranged on the upper and lower side walls of the inner cavity of the box 1, and the baffles 7 correspond to the bending direction of the heat exchange tube 5.

[0044] The alternating arrangement of baffles 7 changes the flow path of the exhaust gas within the chamber. The originally straight-flowing exhaust gas is forced to move along the tortuous channel formed by the baffles 7, which greatly prolongs the contact time and path between the exhaust gas and the heat exchange tubes 5. When high-temperature VOCs exhaust gas flows within the chamber 1, the longer path means that the exhaust gas has more opportunities to fully contact the heat exchange tubes 5, allowing the heat in the exhaust gas to be transferred more effectively to the water inside the heat exchange tubes 5, thereby improving the efficiency of waste heat recovery.

[0045] like Figure 2As shown, a slider is provided at the bottom of the baffle plate 7, and a groove is provided on the inner wall of the housing 1 to cooperate with the slider. Depending on different waste gas treatment requirements and waste heat recovery conditions, the number and position of the baffle plates 7 sometimes need to be adjusted. Because the connection between the slider and the groove is flexible, the baffle plates 7 can be easily removed from the groove or reinstalled in other positions, and the number of baffle plates 7 can even be increased or decreased according to actual conditions. This allows the waste heat recovery device to better adapt to different working conditions, improving the equipment's versatility and adaptability. During long-term operation, the baffle plates 7 may accumulate dust, oil, and other impurities, affecting their performance and service life. At this time, the structure of the slider and groove allows the baffle plates 7 to be easily removed from the housing for thorough cleaning and inspection. Damaged baffle plates can also be easily replaced, reducing maintenance difficulty and cost.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A waste heat recovery device for VOCs waste gas treatment, characterized in that, Includes: a box body (1), with an opening on one side of the box body (1) and a detachable side plate (2), two through holes on the side wall of the box body (1) opposite to the detachable side plate (2), with a water outlet pipe (3) and a water inlet pipe (4) respectively fitted into the two through holes, an exhaust gas inlet (101) on the side of the upper side wall of the box body (1) adjacent to the water outlet pipe (3), and an exhaust gas outlet (102) at the lower part of the vertical side wall of the box body (1) adjacent to the water inlet pipe (4); the water outlet pipe (3) and the water inlet pipe (4) extend into the inner cavity of the box body (1) and are connected by several heat exchange pipes (5); The outlet pipe (3) has the same structure as the inlet pipe (4). The outlet pipe (3) includes, from the outside to the inside of the box body (1), a connecting flange (301), an extension pipe (302), a clamping pipe (303), an abutment plate (304), and a manifold (306). The clamping pipe (303) is adapted to the through hole. The abutment plate (304) abuts against the inner wall of the box body (1). The abutment plate (304) is provided with several threaded holes (305) distributed around its circumference. The box body (1) is provided with mating holes that match the threaded holes (305). The threaded holes (305) are connected to the locking bolts through the mating holes. The manifold (306) is connected to several heat exchange pipes (5).

2. The waste heat recovery device for VOCs waste gas treatment according to claim 1, characterized in that, The outer edge of the abutment plate (304) adjacent to the box body (1) is fitted with a first sealing ring (307), and the junction of the abutment plate (304) and the clamping pipe (303) is fitted with a second sealing ring (308).

3. The waste heat recovery device for VOCs waste gas treatment according to claim 1, characterized in that, The outer side wall of the through hole on the box (1) is provided with a mounting boss (103) concentrically, and the mating holes are circumferentially distributed on the mounting boss (103).

4. A waste heat recovery device for VOCs waste gas treatment according to claim 1, characterized in that, The heat exchange tube (5) is arranged in a serpentine bend and includes several vertical and horizontal tubes that are alternately connected. The outer wall of the vertical tube that is not adjacent to the exhaust gas inlet (101) and the exhaust gas outlet (102) is fitted with a fin assembly (6).

5. A waste heat recovery device for VOCs waste gas treatment according to claim 4, characterized in that, The fin assembly (6) includes: two symmetrically arranged semicircular sleeves (601), the sidewalls of the semicircular sleeves (601) away from the vertical tube are provided with a number of heat exchange fins (602), the two sides of the semicircular sleeves (601) are provided with extension plates (603), the extension plates (603) are provided with a number of connection holes (604), the connection holes (604) on the extension plates (603) of the two semicircular sleeves (601) correspond to each other and are used to cooperate with the bolt and nut assembly.

6. A waste heat recovery device for VOCs waste gas treatment according to claim 4, characterized in that, The upper and lower side walls of the inner cavity of the box (1) are alternately provided with several baffles (7), and the baffles (7) correspond to the bending direction of the heat exchange tube (5).

7. A waste heat recovery device for VOCs waste gas treatment according to claim 6, characterized in that, The bottom of the baffle plate (7) is provided with a slider, and the inner cavity side wall of the box (1) is provided with a groove that cooperates with the slider.

Images