Tail gas waste heat recycling device

Abstract

The utility model provides a tail gas waste heat recycling device which comprises a shell, a tail gas air inlet pipe, a tail gas exhaust pipe and an air exhaust pipe, a heat exchange device communicated with the tail gas air inlet pipe and the tail gas exhaust pipe is installed in the shell and comprises a filtering assembly and a plurality of rows of inner air pipes, an air inlet is formed in the tail gas air inlet pipe, and an air outlet is formed in the air outlet pipe. A first air outlet is formed in the tail gas exhaust pipe, a dirt collecting opening is further formed in the tail gas exhaust pipe, a second air outlet is formed in the heated air exhaust pipe, high-temperature tail gas enters from the air inlet, enters the tail gas exhaust pipe through the inner air pipe and is exhausted from the first air outlet, and air enters the heat transfer device through the filter assembly. The heated air passes through the middle of the plurality of rows of inner air pipes, enters the heated air exhaust pipe and is exhausted from the second air outlet; according to the device, fresh air is heated through waste heat of high-temperature tail gas, and therefore energy consumption is reduced.

Description

Technical Field

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

[0002] With the continuous development of industrialization, energy consumption and environmental pollution have become increasingly serious problems. High-temperature exhaust gases emitted by industries have become a major factor affecting air quality and energy waste. Exhaust gases often contain a large amount of heat energy. If this waste heat can be effectively recovered and reused, it can not only save energy but also reduce pollution emissions. Currently, there are some applications of exhaust gas waste heat recovery technologies. Common recovery methods mainly include heat exchangers, thermoelectric power generation, and heat pump technology. These technologies achieve waste heat recovery by transferring the heat energy in the exhaust gas to other media (such as water, air, etc.). However, existing technologies have some problems, such as: uneven flow rate and temperature distribution of flue gas inside the device, low heat exchange efficiency, and inability to fully recover the heat in the flue gas; complex equipment and high maintenance costs; and they cannot efficiently recover waste heat from exhaust gases while effectively treating pollutants in the exhaust gases.

[0003] Thin film processing often utilizes thermoforming, a technique that softens the film through heating and then deforms it using pressure. Heating makes the film more malleable, easier to shape and mold, allowing for the creation of thin film products with specific shapes and structures. Thin film thermoforming can be achieved using hot oil, heating wires, or other heat-blowing methods. The thermoforming process generates high-temperature exhaust gas, which currently is not reused in thin film processing plants. Therefore, we designed an exhaust gas waste heat recovery device. Through the installation of exhaust gas inlet pipes, exhaust gas outlet pipes, and heated air outlet pipes, the device can effectively treat the heated exhaust gas through heat exchange, achieving energy conservation and emission reduction. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] The problem to be solved by this utility model is to provide a device for reusing exhaust gas waste heat in order to overcome the defects in the prior art.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, this utility model provides a waste heat recovery device for exhaust gas, comprising a shell, an exhaust gas inlet pipe, an exhaust gas outlet pipe, and a heated air outlet pipe. The exhaust gas inlet pipe is located at the upper end of the shell, and the exhaust gas outlet pipe is located at the lower end of the shell. A heat exchange device is installed inside the shell, which is connected to the exhaust gas inlet pipe and the exhaust gas outlet pipe respectively. The exhaust gas inlet pipe is horizontally arranged above the heat exchange device, and the exhaust gas outlet pipe is horizontally arranged below the heat exchange device.

[0008] The heat exchange device includes vertically spaced inner air ducts that connect the exhaust gas inlet duct and the exhaust gas outlet duct; a heat exchange channel is formed between adjacent inner air ducts and connects to the heated air outlet duct; an air inlet chamber is provided at the front end of the housing and connects to the heat exchange channel, and a filter assembly for filtering air is provided at the air inlet chamber; the exhaust gas outlet duct is also provided with a sludge collection port;

[0009] The exhaust gas inlet pipe is provided with an air inlet, the exhaust gas outlet pipe is provided with a first air outlet, and the heated air outlet pipe is provided with a second air outlet. The exhaust gas enters the exhaust gas inlet pipe through the air inlet, enters the exhaust gas outlet pipe after heat exchange through the inner air pipe, and is discharged from the first air outlet. Fresh air from outside enters the air inlet chamber through the filter assembly, is heated through the heat exchange channel of the heat exchange device, and enters the heated air outlet pipe. The heated fresh air is discharged from the second air outlet.

[0010] In this design, the exhaust gas inlet pipe and exhaust gas outlet pipe are respectively located at the upper and lower ends of the casing, and are arranged in parallel. The heat exchange device is located between the exhaust gas inlet pipe and the exhaust gas outlet pipe. The axis of the inner duct of the heat exchange device is vertically arranged. After the exhaust gas enters the inner duct, it will heat up the inner duct, thereby exchanging heat with the passing fresh air to achieve the purpose of heating the fresh air. An air inlet cavity is opened at the front end of the casing, and the heat exchange device is placed inside the air inlet cavity. Therefore, the fresh air from outside can enter the heat exchange channel of the heat exchange device through the air inlet cavity for heat exchange. The heated fresh air then enters the heated air outlet pipe. The filter component at the air inlet cavity can filter dust from the fresh air to prevent dust from entering the heat exchange channel.

[0011] In some embodiments, the lower end of the exhaust gas inlet pipe is provided with a first air guide port that connects to the heat exchange device; the upper end of the exhaust gas outlet pipe is provided with a second air guide port that connects to the heat exchange device. The exhaust gas in the exhaust gas inlet pipe enters the inner air pipe of the heat exchange device through the first air guide port and enters the exhaust gas outlet pipe through the second air guide port.

[0012] In this scheme, the exhaust gas enters the exhaust pipe sequentially through the first air guide port, the inner air duct, and the second air guide port until it is discharged from the first air outlet.

[0013] In some embodiments, the housing is generally rectangular, and the heat exchange device is detachably placed inside the air inlet cavity.

[0014] In this design, the heat exchanger is "inserted" into the air inlet cavity; the entire filter assembly and heat exchanger can be removed from the housing for easy cleaning.

[0015] In some embodiments, a filter plate is provided at the front end of the heat exchange device; the filter assembly includes a filter bracket and filter cotton mounted on the filter plate. In this solution, the filter plate and filter bracket can be filter screen structures with evenly distributed air inlets, and can both be designed as detachable structures (such as bolted connections or snap-fit ​​connections). The filter cotton can be detachably mounted on the filter bracket for easy replacement and cleaning.

[0016] In some embodiments, four heat exchange devices are configured; the filter support is in the form of an outwardly convex arc.

[0017] In this design, the filter support is convex, and the surface area of ​​its curved surface is larger than that of the filter plate. This increases the surface area of ​​the filter support, preventing dust from clogging the air inlet cavity and affecting air intake performance. The filter support can be detachably mounted on the filter plate.

[0018] In some embodiments, the sludge collection port is provided with an openable baffle, and the exhaust pipe contains an oil collection box corresponding to the number of heat exchange devices. In this solution, the baffle is openable and located at the sludge collection port. During the heat exchange process, oil may condense in the exhaust gas. Therefore, in this solution, the exhaust gas inlet pipe and exhaust pipe are respectively located at the upper and lower ends of the shell, and the internal air duct of the heat exchange device is vertically arranged. An oil collection box is placed in the lower exhaust pipe to facilitate the collection of oil.

[0019] In some embodiments, the internal duct is fixed together by a plurality of spaced-apart mounting plates. The mounting plates are used to fix the internal duct to form a heat exchange device.

[0020] In some embodiments, the heated air exhaust duct is installed on the back of the housing, and a third air guide is provided at the front end of the heated air exhaust duct. Fresh air heated and exchanged through the heat exchange channel enters the heated air exhaust duct through the third air guide. In some embodiments, the orientation of the air inlet cavity is perpendicular to the axial direction of the inner air duct. In this design, the air inlet cavity is located on the front side of the housing, and the inner air duct is vertically arranged.

[0021] (III) Beneficial Effects

[0022] This invention provides a waste heat recovery device for exhaust gas. This device utilizes the waste heat of exhaust gas to heat fresh air, which can then be delivered to other external processes, thereby reducing energy consumption. The exhaust gas inlet pipe and exhaust gas outlet pipe are located at the upper and lower ends of the housing, respectively. A heat exchange device is installed between the exhaust gas inlet pipe and the exhaust gas outlet pipe. The heated exhaust gas entering the inner duct of the heat exchange device raises the temperature of the inner duct, and the gaps between the inner ducts form a heat exchange channel. Therefore, fresh air entering this channel undergoes heat exchange and is heated to achieve the desired temperature. The exhaust gas outlet pipe is located at the lower end of the housing, and an oil collection box can be installed at its collection port for easy oil collection. The filter assembly installed at the air inlet cavity on the front side of the housing can filter dust from the fresh air, and its filter support surface is a convex arc surface, which increases the surface area of ​​the filter support and improves air intake. This invention utilizes the waste heat of the entire exhaust gas, resulting in good energy-saving performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a perspective view of a waste heat recovery device for exhaust gas according to the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of a waste heat recovery device for exhaust gas according to the present invention;

[0026] Figure 3 This is a perspective view of the heat transfer device of the exhaust gas waste heat recovery device of this utility model;

[0027] Figure 4 This is a schematic diagram of the exhaust gas inlet pipe of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the heated air exhaust pipe of this utility model;

[0029] Figure 6 This is a schematic diagram of the exhaust pipe structure of this utility model;

[0030] The component names corresponding to the various labels in the figure are as follows: 1. Shell; 2. Exhaust gas inlet pipe; 3. Exhaust gas outlet pipe; 4. Heated air outlet pipe; 5. Heat transfer device; 6. Inner air duct; 7. Filter assembly; 8. Filter plate; 9. Filter bracket; 10. Filter cotton; 11. Air inlet cavity; 12. Baffle; 13. Oil collection box; 201. Air inlet; 301. First air outlet; 302. Sludge collection port; 401. Second air outlet; 202. First air guide port; 303. Second air guide port; 402. Third air guide port; 601. Mounting plate; a. Heat exchange channel. Detailed Implementation

[0031] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0032] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0034] It should also be noted that the drawings provided in the following embodiments are only schematic illustrations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0036] The technical solutions provided by the various embodiments of this application are described below with reference to the accompanying drawings.

[0037] See Figures 1 to 6 This utility model provides a waste heat recovery device for exhaust gas, including a housing 1, an exhaust gas inlet pipe 2, an exhaust gas outlet pipe 3, and a heated air outlet pipe 4. The exhaust gas inlet pipe 2 is located at the upper end of the housing 1, and the exhaust gas outlet pipe 3 is located at the lower end of the housing 1. A heat exchange device 5 is installed inside the housing 1, which is connected to the exhaust gas inlet pipe 2 and the exhaust gas outlet pipe 3 respectively. The exhaust gas inlet pipe 2 is horizontally arranged above the heat exchange device 5, and the exhaust gas outlet pipe 3 is horizontally arranged below the heat exchange device 5.

[0038] The heat exchange device 5 includes vertically spaced inner air ducts 6, which connect to the exhaust gas inlet duct 2 and the exhaust gas outlet duct 3; a heat exchange channel a is formed between adjacent inner air ducts 6, which connects to the heated air outlet duct 4; an air inlet chamber 11 is provided at the front end of the shell 1, which connects to the heat exchange channel a, and a filter component 7 for filtering air is provided at the air inlet chamber 11; the exhaust gas outlet duct 3 is also provided with a sludge collection port 302;

[0039] The exhaust gas inlet pipe 2 is provided with an air inlet 201, the exhaust gas outlet pipe 3 is provided with a first air outlet 301, and the heated air outlet pipe 4 is provided with a second air outlet 401. The exhaust gas enters the exhaust gas inlet pipe 2 through the air inlet 201, enters the exhaust gas outlet pipe 3 after heat exchange through the inner air pipe 6, and is discharged from the first air outlet 301. The air inlet 201 is a square opening. Fresh air from outside enters the air inlet chamber 11 through the filter component 7, is heated through the heat exchange channel a of the heat exchange device 5, and then enters the heated air outlet pipe 4. The heated fresh air is discharged from the second air outlet 401.

[0040] In some embodiments, such as Figure 2 As shown, the lower end of the exhaust gas inlet pipe 2 is provided with a first air guide port 202 connected to the heat exchange device 5; the upper end of the exhaust gas outlet pipe 3 is provided with a second air guide port 303 connected to the heat exchange device 5. The exhaust gas in the exhaust gas inlet pipe 2 enters the inner air pipe 6 of the heat exchange device 5 through the first air guide port 202, and enters the exhaust gas outlet pipe 3 through the second air guide port 303.

[0041] In some embodiments, such as Figure 4 As shown, the housing 1 is generally rectangular, and the entire device is designed to fit as close as possible to one side of the wall, without occupying aisle space. The heat exchange device 5 is detachably placed inside the air inlet chamber 11.

[0042] In some embodiments, such as Figure 4As shown, the heat transfer device 5 consists of four parts, each of which is connected to the exhaust gas inlet pipe 2 and the exhaust gas outlet pipe 3 via an inner air duct 6. The working principle of the heat transfer device 5 is to use the heat of the high-temperature exhaust gas to heat the fresh air processed by the filter assembly 7. In this way, the waste heat of the exhaust gas can be efficiently recovered and reused.

[0043] In some embodiments, such as Figure 1 As shown, high-temperature exhaust gas enters through exhaust gas inlet duct 2, first passing through inlet 201, and then through inner duct 6 into exhaust gas outlet duct 3. During this process, the exhaust gas transfers heat to fresh air and exits through first outlet 301. Fresh air passes through filter assembly 7 into heat transfer device 5, flows through inner duct 6, exchanges heat with the high-temperature exhaust gas, and is thus heated. Finally, it exits through heated air outlet 401 through heated air outlet 4, allowing the filtered fresh air to carry heat into the desired area. High-temperature exhaust gas may carry oil during discharge. Therefore, a sludge collection port 302 is designed, and oil collection boxes 13 corresponding to the number of heat transfer devices 5 are placed inside exhaust gas outlet duct 3. Oil accumulates in the oil collection boxes 13 during cooling, and regular cleaning prevents it from affecting equipment performance.

[0044] In some embodiments, such as Figure 2 As shown, exhaust gas inlet pipe 2 and exhaust gas outlet pipe 3 are respectively provided with air guide ports, namely the first air guide port 202 and the second air guide port 303.

[0045] In some embodiments, such as Figure 2 As shown, four heat transfer devices 5 are configured, and a filter plate 8 is provided between the heat transfer devices 5 and the filter assembly 7; the filter assembly 7 includes a filter support 9 and filter cotton 10, and the filter support 9 is in the shape of an outwardly convex arc.

[0046] In some embodiments, such as Figure 2 As shown, the internal air duct 6 is fixed together by multiple spaced mounting plates 601.

[0047] In some embodiments, such as Figure 1 As shown, the heated air exhaust pipe 4 is installed on the back of the housing 1. The front end of the heated air exhaust pipe 4 is provided with a third air guide 402. Fresh air that has been heated and heat-exchanged through the heat exchange channel a enters the heated air exhaust pipe 4 through the third air guide 402.

[0048] In some embodiments, such as Figure 1 As shown, the air inlet 11 is oriented perpendicular to the axis of the inner air duct 6.

[0049] The same or similar parts between the various embodiments in this specification can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0050] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A tail gas waste heat recycling device, comprising a shell (1), a tail gas air inlet pipe (2), a tail gas air outlet pipe (3) and a heated air air outlet pipe (4), characterized in that: The tail gas inlet pipe (2) is located at the upper end of the shell (1), and the tail gas exhaust pipe (3) is located at the lower end of the shell (1); the heat exchange device (5) is installed in the shell (1) and communicates with the tail gas inlet pipe (2) and the tail gas exhaust pipe (3) respectively; the tail gas inlet pipe (2) is transversely arranged above the heat exchange device (5), and the tail gas exhaust pipe (3) is transversely arranged below the heat exchange device (5); The heat exchange device (5) comprises vertically spaced inner air pipes (6) which communicate with the tail gas inlet pipe (2) and the tail gas exhaust pipe (3); heat exchange channels (a) are formed between adjacent inner air pipes (6) and communicate with the warm air exhaust pipe (4); the front end of the shell (1) is provided with an air inlet cavity (11) which communicates with the heat exchange channel (a), and a filter assembly (7) for filtering air is arranged at the air inlet cavity (11); the tail gas exhaust pipe (3) is also provided with a dirt collecting port (302); The tail gas inlet pipe (2) is provided with an air inlet (201), the tail gas exhaust pipe (3) is provided with a first air outlet (301), and the warm air exhaust pipe (4) is provided with a second air outlet (401); tail gas enters the tail gas inlet pipe (2) from the air inlet (201), is heated by the inner air pipe (6) and then enters the tail gas exhaust pipe (3), and is discharged from the first air outlet (301); fresh air outside enters the air inlet cavity (11) through the filter assembly (7), is heated by the heat exchange device (5) through the heat exchange channel (a) and then enters the warm air exhaust pipe (4), and the heated fresh air is discharged through the second air outlet (401).

2. The exhaust gas waste heat recycling device of claim 1, wherein: The lower end of the tail gas inlet pipe (2) is provided with a first air guide port (202) which communicates with the heat exchange device (5); the upper end of the tail gas exhaust pipe (3) is provided with a second air guide port (303) which communicates with the heat exchange device (5), and the tail gas in the tail gas inlet pipe (2) enters the inner air pipe (6) of the heat exchange device (5) through the first air guide port (202) and enters the tail gas exhaust pipe (3) through the second air guide port (303).

3. The exhaust gas waste heat recycling device of claim 1, wherein: The shell (1) is a cuboid as a whole, and the heat exchange device (5) can be detachably placed in the air inlet cavity (11).

4. The exhaust gas waste heat recycling device of claim 3, wherein: The front end of the heat exchange device (5) is provided with a filter plate (8); the filter assembly (7) comprises a filter support (9) and filter cotton (10) which are mounted on the filter plate (8).

5. The exhaust gas waste heat recycling device of claim 4, wherein: The heat exchange device (5) is configured as four; the filter support (9) is in the shape of an outward convex arc.

6. The exhaust gas waste heat reusing device according to claim 1, characterized in that: The dirt collecting port (302) is provided with an openable baffle (12), and the tail gas exhaust pipe (3) is provided with an oil receiving box (13) corresponding in number to the heat exchange device (5).

7. The exhaust gas waste heat recovery device of claim 1, wherein: The inner air pipes (6) are fixed together by a plurality of spaced mounting plates (601).

8. The exhaust gas waste heat recovery device of claim 1, wherein: The heating air exhaust pipe (4) is installed on the back of the shell (1), and the front end of the heating air exhaust pipe (4) is provided with a third air guide opening (402), and the fresh air heated through the heat exchange channel (a) enters the heating air exhaust pipe (4) through the third air guide opening (402).

9. The exhaust gas heat recovery device of claim 1, wherein: The air inlet cavity (11) is oriented in a direction perpendicular to the axis direction of the inner air pipe (6).

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