A flue-type low-temperature heat exchanger with self-cleaning function

Abstract

This invention relates to the field of heat exchanger technology and proposes a flue-type low-temperature heat exchanger with self-cleaning function. This embodiment proposes a flue-type low-temperature heat exchanger with self-cleaning function, including a shell and a heat exchange mechanism, as well as a dust removal mechanism, a separation mechanism, and a closing mechanism. The dust removal mechanism is designed at the bottom of the shell and is used to separate dust from the heat exchange mechanism. The separation mechanism is used to separate and collect dust from the gas. The closing mechanism is used to control the opening and closing of the flue. The dust removal mechanism includes a vibrating support and a vibrating motor, with two support arms on the vibrating support. The separation mechanism includes a cyclone separator and a dust box. The cyclone separator is located at the bottom of the shell. This technical solution solves the problem in the prior art where shutting down the flue to clean the flue heat exchanger is inefficient and affects production progress.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to a flue-type low-temperature heat exchanger with a self-cleaning function. Background Technology

[0002] Large amounts of thermal energy are used in fields such as power and metallurgy. Flue gas from heating devices is discharged into the air through flues. Since the temperature of flue gas is usually very high, directly discharging it into the atmosphere is a waste of energy. Therefore, flue gas heat exchangers are usually installed at the point where the temperature is highest, close to the flue gas outlet. A flue gas heat exchanger is a device that transfers heat from the flue gas to the water through heat exchange fins to heat the water. By converting the heat from the flue gas into hot water, the water can be used elsewhere, reducing resource waste.

[0003] Flue gas typically contains a significant amount of dust, coal dust, and high-temperature pyrolysis products generated during combustion in heating devices. After prolonged contact with flue gas, dust accumulates in the flue heat exchanger, affecting its heat exchange efficiency. In severe cases, this can impair the flue gas flow through the heat exchanger. Therefore, it is necessary to clean the flue heat exchanger. Traditional flue heat exchanger cleaning involves shutting off the flue pipes and manually disassembling the heat exchanger to clean the interior, or shutting off a portion of the flue for cleaning before cleaning the remaining flue. However, this method is complex, time-consuming, and may affect equipment production schedules. Summary of the Invention

[0004] This invention proposes a flue-type low-temperature heat exchanger with self-cleaning function, which solves the problem in related technologies that the efficiency of cleaning the flue heat exchanger by shutting down the flue is low and will affect the production schedule.

[0005] The technical solution of the present invention is as follows:

[0006] A flue-type low-temperature heat exchanger with self-cleaning function includes a shell and a heat exchange mechanism, characterized in that it further includes:

[0007] The first dust removal mechanism is designed at the bottom of the outer casing and is used to separate the dust on the heat exchange mechanism from the heat exchange mechanism.

[0008] The first dust removal mechanism includes:

[0009] A vibration bracket, which is mounted on the outer casing and extends into the outer casing;

[0010] A vibration motor is disposed at the bottom of the vibration bracket;

[0011] A separation mechanism is disposed at the bottom of the housing, and the separation mechanism is used to separate and collect dust in the gas;

[0012] The separation mechanism includes:

[0013] A cyclone separator, wherein the cyclone separator is conical in shape and is disposed at the bottom of the outer casing;

[0014] A dust box, which is detachably mounted at the bottom of the cyclone separator;

[0015] A closing mechanism, wherein two closing mechanisms are provided and are disposed on the outer casing, and the closing mechanism is used to control the opening and closing of the flue;

[0016] The outer shell is provided with:

[0017] A flue gas inlet is located on one side of the outer casing;

[0018] A flue gas outlet is provided on the side of the outer casing away from the flue gas inlet, and the closing mechanism is provided on both the flue gas outlet and the flue gas inlet;

[0019] The second dust removal mechanism includes:

[0020] A pressurization pipe is disposed on the upper part of the outer casing and is connected to the flue gas inlet;

[0021] A pressurizing air pump is installed on the pressurizing pipe, and the air outlet of the pressurizing air pump is connected to the pressurizing pipe;

[0022] The pressurization pipe is connected to the flue gas inlet on the side of the closing mechanism located away from the outer casing. When the closing mechanism located at the flue gas inlet is closed, the flue gas flows through the pressurization pipe to the top of the outer casing. When the flue gas flow rate is low, the pressurization pump fills the pressurization pipe with gas, thereby increasing the gas flow rate towards the heat exchange tubes and heat exchange plates of the heat exchange mechanism. By placing the pressurization pipe above the outer casing, it is convenient to blow dust into the cyclone separator below the outer casing. On the other hand, by changing the gas flow direction, the dust can be more easily blown off and collected at the bottom of the outer casing.

[0023] The heat exchange mechanism includes:

[0024] A water inlet pipe is disposed outside the outer casing, and a water inlet is provided on the water inlet pipe;

[0025] A water outlet pipe is provided on the side of the outer casing where the water inlet pipe is located, and the water outlet pipe is provided with a water outlet.

[0026] The heat exchange tubes are provided in multiples and are located inside the outer shell. The heat exchange tubes are connected to the inlet pipe and the outlet pipe. Multiple heat exchange plates are provided on the heat exchange tubes, and the vibration bracket is in contact with the heat exchange plates.

[0027] The closing mechanism includes:

[0028] A fixing ring, wherein the fixing ring is sleeved on the flue gas inlet or flue gas outlet;

[0029] The blades are provided in multiples and are disposed inside the fixed ring. The blades are rotatably disposed with respect to the fixed ring. A turning rod is provided on the blades, and a spherical rotating shaft is provided on the turning rod.

[0030] A connecting rod, wherein multiple connecting rods are provided, and both ends of the connecting rods are rotatably configured to rotate with the spherical shaft;

[0031] A central rotating shaft is disposed inside the fixed ring and is rotatably disposed with respect to the end of the blade away from the spherical rotating shaft;

[0032] A drive assembly for driving the blades to rotate.

[0033] The driving component includes:

[0034] A rotating shaft seat is fixedly installed on the flue gas inlet or flue gas outlet;

[0035] A drive cylinder, which is rotatably mounted to the rotating shaft seat;

[0036] A rotating shaft is mounted on the deflector rod of one of the blades, and the output end of the drive cylinder is slidably mounted on the rotating shaft.

[0037] The working principle and beneficial effects of this invention are as follows:

[0038] 1. In this invention, by setting a vibration motor fixed on a vibration bracket, the dust attached to the heat exchange tubes and heat exchange plates can be vibrated and dropped to the bottom of the outer shell. The dust will flow into the cyclone separator and be collected in the dust box. When the flue gas passes through the cyclone separator quickly, the flue gas rotates in the cyclone separator. Under the action of centrifugal force, the dust is thrown onto the inner wall of the cyclone separator and then slides into the dust box. The flue gas is connected to the flue gas outlet through the gas outlet pipe in the center of the cyclone separator. During the dust removal process, the flue gas also passes between the heat exchange tubes, so there is no need to shut down the equipment. At the same time, the heat recovery of the flue gas does not need to be interrupted. The flow of flue gas can also be used for cleaning dust. When the flow rate of the flue gas is not high, the flow rate of the gas entering from the upper part of the outer shell can be increased by a pressurized air pump to blow the dust off the heat exchange plates.

[0039] 2. In this invention, by setting a spherical rotating shaft on the turning rod and a connecting rod to rotate, the connecting rod can rotate at multiple angles with the spherical rotating shaft. When the blade rotates to open or close, the connecting rod can drive the blade on the same side to rotate simultaneously. By extending and retracting the drive cylinder, the turning rod of one blade can be driven to rotate. The drive cylinder rotates vertically and horizontally on the rotating shaft seat. The opening and closing of the flue gas inlet and flue gas outlet can be controlled by one drive cylinder.

[0040] 3. This invention can remove dust from the heat exchanger and collect dust without affecting the operation of the equipment by using a dust removal mechanism and a separation mechanism. By setting a closing mechanism, the flue gas inlet and outlet can be closed and opened to control the flow direction of the flue gas, and the flow of the flue gas is used for dust removal. Attached Figure Description

[0041] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0042] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0043] Figure 2 This is a schematic diagram of the overall structure of the dust removal mechanism and the heat exchange mechanism in this invention;

[0044] Figure 3 This is a schematic diagram of the separation mechanism in this invention;

[0045] Figure 4 This is a schematic diagram of the closing mechanism in this invention;

[0046] Figure 5 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0047] In the diagram: 1. Outer shell; 2. Vibration support; 3. Vibration motor; 4. Cyclone separator; 5. Dust box; 6. Flue gas inlet; 7. Flue gas outlet; 8. Pressurization pipe; 9. Pressurization pump; 10. Water inlet pipe; 11. Water inlet; 12. Water outlet pipe; 13. Water outlet; 14. Heat exchanger tube; 15. Fixing ring; 16. Blade; 17. Deflector rod; 18. Spherical rotating shaft; 19. Connecting rod; 20. Central rotating shaft; 21. Shaft seat; 22. Drive cylinder; 23. Rotating shaft. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] like Figures 1-5As shown, this embodiment proposes a flue-type low-temperature heat exchanger with self-cleaning function, including a shell 1 and a heat exchange mechanism. The key feature is that it further includes a first dust removal mechanism, a separation mechanism, a closing mechanism, and a second dust removal mechanism. The first dust removal mechanism is designed at the bottom of the shell 1 and is used to separate dust from the heat exchange mechanism. The first dust removal mechanism includes a vibrating support 2 and a vibrating motor 3. The vibrating support 2 is mounted on the shell 1 and has two support arms that extend into the shell 1. The vibrating motor 3 is located at the bottom of the vibrating support 2. The separation mechanism is located at the bottom of the shell 1 and is used to separate and collect dust from the gas. The separation mechanism includes a cyclone separator 4 and a dust box 5. The cyclone separator 4 is conical and located at the bottom of the shell 1. The dust box 5 is detachably mounted at the bottom of the cyclone separator 4. Two closing mechanisms are provided on the shell 1 and are used to control the opening and closing of the flue. The shell 1 has a flue gas inlet 6 and a flue gas outlet 7. The flue gas inlet 6 is located on one side of the shell 1. The outlet 7 is located on the side of the outer casing 1 away from the flue gas inlet 6. Both the flue gas outlet 7 and the flue gas inlet 6 are equipped with closing mechanisms. The second dust removal mechanism includes a pressurizing pipe 8 and a pressurizing pump 9. The pressurizing pipe 8 is located on the upper part of the outer casing 1 and is connected to the flue gas inlet 6. The pressurizing pump 9 is located on the pressurizing pipe 8, and its outlet is connected to the pressurizing pipe 8. The inlet of the cyclone separator 4 is located on the side and is connected to the bottom of the outer casing 1. The outlet is located at the top center of the cyclone separator 4 and is connected to the flue gas outlet 7. The closure mechanism at the flue gas outlet 7 is located on the side away from the outer casing 1. The dust box 5 is detachably installed at the bottom of the cyclone separator 4. The bottom of the cyclone separator 4 is provided with two fan-shaped protrusions. The dust box 5 is provided with two similar fan-shaped protrusions. A circular sealing ring is provided in the dust box 5. The fan-shaped protrusions at the bottom of the cyclone separator 4 are inserted between the two fan-shaped protrusions on the dust box 5 and the dust box 5 is rotated to fix the dust box 5 at the bottom of the cyclone separator 4. The sealing ring can prevent dust from being blown out in the gaps between the fan-shaped protrusions.

[0050] like Figures 1-3 As shown, the pressurizing pipe 8 is connected to the flue gas inlet 6 on the side of the closing mechanism away from the outer shell 1. When the closing mechanism of the flue gas inlet 6 is closed, the flue gas flows through the pressurizing pipe 8 to the top of the outer shell 1. When the flow rate of the flue gas is not high, the pressurizing pump 9 fills the pressurizing pipe 8 with gas, thereby increasing the flow rate of the gas blowing towards the heat exchange tube 14 and the heat exchange plate. By placing the pressurizing pipe 8 above the outer shell 1, it is convenient to blow the dust into the cyclone separator 4 below the outer shell 1. On the other hand, by changing the direction of gas flow, the dust can be blown off more easily and collected at the bottom of the outer shell 1.

[0051] like Figure 2 As shown, the heat exchange mechanism includes an inlet pipe 10, an outlet pipe 12, and heat exchange tubes 14. The inlet pipe 10 is located outside the outer casing 1 and has an inlet 11. The outlet pipe 12 is located on the side of the outer casing 1 where the inlet pipe 10 is located and has an outlet 13. The inlet 11 is located at the bottom of the inlet pipe 10, and the outlet 13 is located above the outlet pipe 12. When ambient temperature water is added to the inlet pipe 10, it flows sequentially from bottom to top into the multiple heat exchange tubes 14. After sufficient heat absorption by the flue gas, the hot water... The upper water outlet 13 is separated from the water outlet pipe 12. Multiple heat exchange tubes 14 are provided. The heat exchange tubes 14 are located inside the outer shell 1. The heat exchange tubes 14 are connected to the water inlet pipe 10 and the water outlet pipe 12. Multiple heat exchange plates are provided on the heat exchange tubes 14. The heat exchange plates are arranged vertically. Two arms of the vibration bracket 2 extend into the outer shell 1 and contact the heat exchange plates. When the vibration motor 3 vibrates, the vibration is transmitted to the heat exchange plates through the arms of the vibration bracket 2. The dust attached to the heat exchange plates falls into the air inlet of the cyclone separator 4 under the vibration and the blowing of air in the pressurization pipe 8.

[0052] like Figure 4As shown, the closing mechanism includes a fixed ring 15, blades 16, connecting rods 19, a central rotating shaft 20, and a drive assembly. The fixed ring 15 is fitted onto the flue gas inlet 6 or the flue gas outlet. Multiple blades 16 are provided and are disposed inside the fixed ring 15, rotating rotatably with the fixed ring 15. A deflector rod 17 is provided on each blade 16, and two spherical rotating shafts 18 are provided on the deflector rod 17. Multiple connecting rods 19 are provided, with the two spherical rotating shafts 18 on the deflector rod 17 respectively rotatably connected to the spherical rotating shafts 18 on the deflector rods 17 of adjacent blades 16 via the connecting rods 19. Both ends of the connecting rod 19 are rotatably connected to the spherical rotating shafts 18, allowing for multi-angle rotation. The central rotating shaft 20 is disposed inside the fixed ring 15, rotating rotatably with the end of the blade 16 furthest from the spherical rotating shafts 18. When the deflector rod 17 rotates, it can drive the deflector rods 17 of the blades 16 on the same side through the connecting rod 19. The drive assembly, which rotates at the same angle, drives the blades 16 to rotate. The drive assembly includes a rotating shaft seat 21, a drive cylinder 22, and a rotating shaft 23. The rotating shaft seat 21 is fixedly mounted on the flue gas inlet 6 or the flue gas outlet 7. The part of the rotating shaft seat 21 that is rotatably mounted with the drive cylinder 22 can rotate. The drive cylinder 22 is rotatably mounted with the rotating shaft seat 21. When the drive cylinder 22 extends and pushes the turning rod 17 to rotate, the turning rod 17 can rotate in two directions. The rotating shaft 23 is mounted on the turning rod 17 of one of the blades 16. The output end of the drive cylinder 22 is slidably mounted with the rotating shaft 23. When the drive cylinder 22 extends, the drive cylinder 22 rotates on the rotating shaft seat 21. The part of the rotating shaft seat 21 that is connected with the drive cylinder 22 rotates simultaneously. The turning rod 17 drives the blades 16 to rotate. The rotating shaft 23 rotates relative to the output end of the drive cylinder 22. The blades 16 rotate to open. When the drive cylinder 22 retracts, the blades 16 rotate to close.

[0053] In this embodiment, when the heat exchanger needs cleaning, the drive cylinder 22 shortens, rotates on the rotating shaft seat 21, and the part connecting the rotating shaft seat 21 and the drive cylinder 22 rotates. The drive cylinder 22 rotates relative to the rotating shaft 23, and the turning rod 17 rotates. The turning rod 17 drives other turning rods 17 to rotate through the connecting rod 19, so that the blades 16 on the same side rotate simultaneously until the blades 16 close together. Then, the flue gas inlet 6 and the flue gas outlet 7 are closed, the vibration motor 3 starts, and the vibration bracket 2 drives the heat exchange tube 14 to vibrate. The dust is dislodged from the heat exchange fins. The flue gas is blown downwards from the top of the outer shell 1 to the heat exchange tube 14 through the pressurization pipe 8. The pressurization pump 9 sends outside gas into the pressurization pipe 8 to increase the airflow velocity towards the heat exchange fins, blowing the dislodged dust to the bottom of the outer shell 1. The airflow carries the dust into the cyclone separator 4. The airflow rotates in the cyclone separator 4 and uses centrifugal force to throw the dust onto the outer shell 1 of the cyclone separator 4. The dust falls into the dust box 5. Air enters the flue gas outlet 7 through the central air outlet of the cyclone separator 4, thus achieving the cleaning and collection of dust.

[0054] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flue-type low-temperature heat exchanger having a self-cleaning function, comprising a shell (1) and a heat exchange mechanism, characterized in that, Also include: The first dust removal mechanism, the first dust removal mechanism is designed in the bottom of the shell (1), the first dust removal mechanism is used for separating the dust on the heat exchange mechanism and heat exchange mechanism; Wherein, the first dust removal mechanism includes: Vibration support (2), the vibration support (2) is arranged on the shell (1), the vibration support (2) extends into the shell (1); Vibration motor (3), the vibration motor (3) is arranged at the bottom of the vibration support (2); Separation mechanism, the separation mechanism is arranged at the bottom of the shell (1), the separation mechanism is used for separating and collecting dust in gas; Wherein, the separation mechanism includes: Cyclone separator (4), the cyclone separator (4) is arranged in a conical shape, the cyclone separator (4) is arranged at the bottom of the shell (1); Dust box (5), the dust box (5) is detachably arranged at the bottom of the cyclone separator (4); The closure mechanism is provided with two, the closure mechanism is arranged on the shell (1), the closure mechanism is used for controlling the opening and closing of the flue; The shell (1) is provided with: Flue gas inlet (6), the flue gas inlet (6) is arranged on one side of the shell (1); Flue gas outlet (7), the flue gas outlet (7) is arranged on the side of the shell (1) away from the flue gas inlet (6), the flue gas outlet (7) and the flue gas inlet (6) are both provided with the closure mechanism; Second dust removal mechanism, the second dust removal mechanism includes: Pressurizing pipe (8), the pressurizing pipe (8) is arranged on the upper part of the shell (1), the pressurizing pipe (8) communicates with the flue gas inlet (6); Pressurized air pump (9), the pressurized air pump (9) is arranged on the pressurizing pipe (8), the gas outlet of the pressurized air pump (9) is connected to the pressurizing pipe (8); The pressurizing pipe (8) is connected with the flue gas inlet (6) on the side of the closure mechanism arranged in the flue gas inlet (6) away from the shell (1), when the closure mechanism arranged in the flue gas inlet (6) is closed, the flue gas flows to the top of the shell (1) through the pressurizing pipe (8), when the flow rate of the flue gas is not large, the gas is filled into the pressurizing pipe (8) through the pressurized air pump (9), so that the flow rate of the gas blowing to the heat exchange pipe (14) and the heat exchange fin of the heat exchange mechanism is accelerated, by arranging the pressurizing pipe (8) above the shell (1), on the one hand, it can be convenient to blow the dust into the cyclone separator (4) below the shell (1), on the other hand, it can make the dust more easily blown off by changing the direction of gas flow, and the dust is blown off to the bottom of the shell (1) for collection.

2. The flue-type low-temperature heat exchanger with a self-cleaning function according to claim 1, characterized in that, The heat exchange mechanism includes: Water inlet pipe (10), the water inlet pipe (10) is arranged outside the shell (1), the water inlet pipe (10) is provided with a water inlet (11); Water outlet pipe (12), the water outlet pipe (12) is arranged on the side of the shell (1) provided with the water inlet pipe (10), the water outlet pipe (12) is provided with a water outlet (13); Heat exchange pipes (14) are arranged inside the shell (1), connected with the water inlet pipe (10) and the water outlet pipe (12), and provided with a plurality of heat exchange fins; the vibration support (2) is in contact with the heat exchange fins.

3. The flue-type low-temperature heat exchanger with a self-cleaning function according to claim 2, characterized in that, The closing mechanism comprises: A fixing ring (15) is sleeved on the flue gas inlet (6) or the flue gas outlet; A plurality of blades (16) are arranged inside the fixing ring (15) and rotatably arranged with the fixing ring (15); the blades (16) are provided with a turning rod (17) and a spherical pivot (18) on the turning rod (17); A plurality of connecting rods (19) are rotatably arranged at both ends of the spherical pivot (18); A central pivot (20) is arranged inside the fixing ring (15) and rotatably arranged with the blades (16) away from one end of the spherical pivot (18); A driving assembly is arranged to drive the blades (16) to rotate.

4. The flue-type low-temperature heat exchanger with a self-cleaning function according to claim 3, characterized in that, The driving assembly comprises: A pivot seat (21) is fixedly arranged on the flue gas inlet (6) or the flue gas outlet (7); A driving cylinder (22) is rotatably arranged with the pivot seat (21); A rotating shaft (23) is arranged on the turning rod (17) of one of the blades (16), and an output end of the driving cylinder (22) is slidably arranged with the rotating shaft (23).

Images