A flue gas heat recovery device

Abstract

This utility model relates to the field of heat recovery technology and discloses a flue gas heat recovery device, including a heat exchange shell and a heat transfer tube disposed in its inner cavity, and further including: an air inlet opened on one side of the heat exchange shell, and an exhaust port opened on the other side of the heat exchange shell; this utility model, through the arrangement of the air inlet plate, the first air inlet hole and the first guide plate and other structures, can make the flue gas enter the inner cavity of the heat exchange shell evenly to heat the heat transfer tube, effectively reducing the situation where the flue gas is concentrated near the air inlet, reducing the situation where the heat transfer tube is severely heated in some areas and insufficiently heated in other areas, the air inlet plate can effectively block the flue gas particles, and with the cooperation of the cleaning mechanism, the flue gas particles can be cleaned, effectively reducing the blockage of the air inlet plate and the heat transfer tube, allowing the flue gas to flow normally, solving the problems of poor heat exchange efficiency and easy blockage of the surface of the heat transfer tube in the existing device.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery technology, specifically a flue gas heat recovery device. Background Technology

[0002] In industrial production, the high-temperature flue gas emitted by equipment such as boilers, kilns, and electric arc furnaces contains a large amount of waste heat. Traditional direct emission methods not only waste energy, but also exacerbate air pollution due to the nitrogen oxides, sulfur dioxide, and other pollutants contained in the flue gas. Taking the steel industry as an example, the failure to recover and utilize the high-temperature flue gas from blast furnaces and steelmaking furnaces will lead to heat loss and increase the carbon emission pressure on enterprises. With the advancement of global climate governance and the "dual carbon" goal, the industrial sector needs to rely on flue gas waste heat recovery technology to save energy and reduce emissions, and promote green development.

[0003] However, in some existing flue gas heat recovery devices, the flue gas directly enters the heat exchange area. Due to the simple structure of the inlet, the flue gas often concentrates in the area near the inlet, resulting in severe local heating of the heat exchange tubes while other areas are underheated, forming a temperature gradient and reducing the overall heat exchange efficiency.

[0004] In addition, in some existing flue gas heat recovery devices, particulate matter carried in the flue gas tends to accumulate on the surface of the heat transfer tubes during use, increasing the wall thickness of the heat transfer tubes and thus affecting the normal flow of flue gas and heat exchange efficiency. Furthermore, some devices lack a structure for self-cleaning, requiring periodic shutdowns for manual cleaning, which increases equipment downtime and maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a flue gas heat recovery device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flue gas heat recovery device, comprising a heat exchange shell and a heat transfer tube disposed within its inner cavity, and further comprising: An air inlet is provided on one side of the heat exchange shell, and an exhaust port is provided on the other side of the heat exchange shell. An air inlet plate is fixedly connected to the inner wall of the air inlet, and a cleaning mechanism for cleaning the air inlet plate is provided on the inner wall of the air inlet. The air intake plate has several first air intake holes on its surface for passing through the flue gas, several second air intake holes on its surface for passing through the flue gas, several third air intake holes on its surface for passing through the flue gas, a first guide plate for guiding the flue gas fixedly connected to one side of the air intake plate, a second guide plate for guiding the flue gas fixedly connected to one side of the air intake plate, and a drain valve for treating flue gas particles provided at the bottom of the heat exchange shell.

[0007] Preferably, the cleaning mechanism includes a mounting bracket fixedly connected to the inner wall of the air inlet, five dust removal cloths fixedly connected to one side of the mounting bracket, and counterweights fixedly connected to the upper and lower surfaces of the dust removal cloths.

[0008] Preferably, the diameter of the second air inlet is smaller than the diameter of the first air inlet, and the position of the second air inlet is surrounded by the first air inlet.

[0009] Preferably, the diameter of the third air inlet is smaller than the diameter of the first air inlet and the second air inlet, and the position of the third air inlet is surrounded by the second air inlet.

[0010] Preferably, the angle of the second guide plate is smaller than the angle of the first guide plate.

[0011] Preferably, the dust removal cloth is made of polytetrafluoroethylene membrane filter material.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention, through the arrangement of an air inlet plate, a first air inlet hole, and a first guide plate, enables flue gas to enter the inner cavity of the heat exchange shell evenly, heating the heat transfer tubes. This effectively reduces the concentration of flue gas near the air inlet, minimizing localized overheating of the heat transfer tubes while other areas are underheated, thereby improving overall heat exchange efficiency. The air inlet plate effectively blocks flue gas particles, and with the assistance of a cleaning mechanism, these particles are cleaned, reducing the connection between dust and the heat transfer tubes. This effectively reduces the likelihood of blockages in the air inlet plate and heat transfer tubes, allowing flue gas to flow normally and further ensuring the heat exchange efficiency of the device to meet the heat exchange requirements during production or use. This solves the problems of poor heat exchange efficiency and easy blockage of the heat transfer tube surface in existing devices. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional cross-sectional structural diagram of the present invention; Figure 3 This is a partial three-dimensional cross-sectional structural diagram from another perspective of the present invention; Figure 4 This is a partial three-dimensional structural schematic diagram from another perspective of the present invention.

[0014] In the diagram: 1. Heat exchange shell; 2. Heat transfer tube; 3. Air inlet; 4. Exhaust outlet; 5. Cleaning mechanism; 51. Mounting bracket; 52. Dust removal cloth; 53. Counterweight; 6. Air inlet plate; 7. First air inlet; 8. Second air inlet; 9. Third air inlet; 10. First guide plate; 11. Second guide plate; 12. Drain valve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-4As shown, a flue gas heat recovery device includes a heat exchange shell 1, which is composed of a support frame and other structures for easy operation. A heat transfer tube 2 is installed inside the heat exchange shell 1, and water is stored within the heat transfer tube 2. An air inlet 3 is located on one side of the heat exchange shell 1, and an exhaust outlet 4 is located on the other side. Flue gas can enter the inner cavity of the heat exchange shell 1 through the air inlet 3 to heat the water in the heat transfer tube 2, and then exit through the exhaust outlet 4. A cleaning mechanism 5 is installed on the inner wall of the air inlet 3, and an air inlet plate 6 is fixedly connected to the inner wall of the air inlet 3. The cleaning mechanism 5 can clean residual flue gas particles on the surface of the air inlet plate 6. The cleaning mechanism 5 works in conjunction with the air inlet plate 6. The air intake plate 6 has several first air inlets 7 and several second air inlets 8. The diameter of the second air inlets 8 is smaller than the diameter of the first air inlets 7, and the second air inlets 8 are surrounded by the first air inlets 7. The air intake plate 6 also has several third air inlets 9. The diameter of the third air inlets 9 is smaller than the diameters of the first air inlets 7 and the second air inlets 8, and the third air inlets 9 are surrounded by the second air inlets 8. A first guide plate 10 is fixedly connected to one side of the air intake plate 6 and is located between the first air inlets 7 and the second air inlets 8. A second guide plate 11 is fixedly connected to one side of the air intake plate 6 and is located between the second air inlets 8 and the third air inlets 9. The angle of plate 11 is smaller than that of the first guide plate 10. Under this action, when the flue gas enters the inlet 3 and impacts the inlet plate 6 through the cleaning mechanism 5, the flue gas can be guided and dispersed by the combined action of the inlet holes of different diameters and the guide plates. The first guide plate 10 guides the flue gas passing through the first inlet hole 7 at a larger angle, causing it to diffuse in all directions, thereby increasing the contact area between the flue gas and the heat transfer tube 2. The second guide plate 11 further guides the flue gas passing through the second inlet hole 8 and the third inlet hole 9 at a smaller angle, making the flue gas more evenly distributed when entering the device. This multi-stage guiding design effectively reduces the formation of local eddies and dead zones in the flue gas at the inlet 3, improving the efficiency of the process. The improved flue gas flow efficiency also creates favorable conditions for subsequent heat recovery. The bottom center of the air inlet plate 6 is recessed, which facilitates the discharge of flue gas particles cleaned by the cleaning mechanism 5, thus facilitating subsequent treatment of the flue gas particles. A drain valve 12 is installed at the bottom of the heat exchange shell 1. The drain valve 12 works in conjunction with the cleaning mechanism 5. Under this action, the dust particles cleaned by the cleaning mechanism 5 will fall into the inner cavity of the heat exchange shell 1. When a certain amount of dust particles accumulate, the operator can open the drain valve 12 to discharge the dust particles from the device, thereby keeping the inside of the device clean, ensuring heat recovery efficiency, and enabling the device to operate stably.

[0017] The cleaning mechanism 5 includes a mounting bracket 51 fixedly connected to the inner wall of the air inlet 3. Five dust removal cloths 52 are fixedly connected to one side of the mounting bracket 51. The dust removal cloths 52 are made of polytetrafluoroethylene membrane filter material. The dust removal cloths 52 can clean the flue gas particles on the surface of the air inlet plate 6. The upper and lower surfaces of the dust removal cloths 52 are fixedly connected to counterweights 53, which are staggered. Under this action, the flue gas enters from the air inlet 3 and passes through the mounting bracket 51. Under the action of the counterweights 53, the dust removal cloths 52 swing up and down, which can loosen the flue gas particles accumulated on the surface of the air inlet plate 6. This allows the dust removal cloths 52 to effectively clean the flue gas particles on the surface of the air inlet plate 6, reducing the possibility of blockage of the air inlet plate 6 and reducing the flue gas particles on its surface. This ensures the heat exchange efficiency of the device and extends the service life of the air inlet plate 6.

[0018] It is worth noting that the technical features such as the heat exchange shell 1 proposed in this technical solution should be regarded as prior art. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be selected using conventional methods in this field. This technical solution will not elaborate further.

[0019] Working principle: First, flue gas enters the inner cavity of heat exchange shell 1 through inlet 3 and impacts inlet plate 6. Under the combined action of inlet holes of different diameters and guide plates of different angles, the first guide plate 10 guides the flue gas passing through the first inlet hole 7 at a larger angle to diffuse in all directions. The second guide plate 11 further guides the flue gas passing through the second inlet hole 8 and the third inlet hole 9 at a smaller angle, so that the flue gas is evenly distributed when it enters the device. This reduces the formation of local eddies and dead zones in the flue gas at inlet 3, improves the flow efficiency of the flue gas, and allows the heat transfer tube 2 to be evenly heated. When hot flue gas enters through the inlet 3 and passes through the mounting bracket 51, the dust removal cloth 52 can swing up and down under the action of the counterweight 53, loosening the flue gas particles accumulated on the surface of the inlet plate 6. This effectively cleans the flue gas particles on the surface of the inlet plate 6, reducing the possibility of blockage in the inlet plate 6, ensuring the heat exchange efficiency of the device, and keeping it at a relatively ideal level to meet the heat exchange requirements during production or use. This reduces equipment downtime and maintenance costs caused by frequent replacement of the inlet plate 6, and ensures the stable operation of the entire device.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas heat recovery device comprising a heat exchange shell (1) and a heat transfer pipe (2) arranged in the inner cavity thereof, characterized in that, Also include: The air inlet (3) is opened in one side of the heat exchange shell (1), the other side of the heat exchange shell (1) is opened to the exhaust port (4), the inner wall of the air inlet (3) is fixedly connected with the air inlet plate (6), the inner wall of the air inlet (3) is provided with the cleaning mechanism (5) for cleaning the air inlet plate (6); A plurality of first air inlets (7) for allowing flue gas to pass through are opened on the surface of the air inlet plate (6), a plurality of second air inlets (8) for allowing flue gas to pass through are opened on the surface of the air inlet plate(6), a plurality of third air inlets (9) for allowing flue gas to pass through are opened on the surface of the air inlet plate, the side of the air inlet plate (6) is fixedly connected with the first baffle (10) for guiding the flue gas, the side of the air inlet plate (6) is fixedly connected with the second baffle (11) for guiding the flue gas, the bottom of the heat exchange shell (1) is provided with the blowdown valve (12) for treating flue gas particles.

2. A flue gas heat recovery device according to claim 1, characterised in that: The cleaning mechanism (5) includes a mounting frame (51) fixedly connected to the inner wall of the air inlet (3), the side of the mounting frame (51) is fixedly connected with five dust cloths (52), the upper and lower surfaces of the dust cloth (52) are fixedly connected with the counterweight (53).

3. A flue gas heat recovery device according to claim 1, characterised in that: The diameter of the second air inlet (8) is smaller than that of the first air inlet (7), and the position of the second air inlet (8) is surrounded by the first air inlet (7).

4. A flue gas heat recovery device according to claim 1, characterised in that: The diameter of the third air inlet (9) is smaller than that of the first air inlet (7) and the second air inlet (8), and the position of the third air inlet (9) is surrounded by the second air inlet (8).

5. A flue gas heat recovery device according to claim 1, characterised in that: The angle of the second baffle (11) is smaller than that of the first baffle (10).

6. A flue gas heat recovery device according to claim 2, characterised in that: The dust cloth (52) is made of polytetrafluoroethylene film filter material.

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