WO2021179929A1

WO2021179929A1 - Ash removal apparatus and ash removal method for tubular heat exchanger

Info

Publication number: WO2021179929A1
Application number: PCT/CN2021/078466
Authority: WO
Inventors: 万鹏; 赖日东; 唐转清; 杨培忠; 宋旭; 吴德富
Original assignee: 广东中鹏热能科技有限公司
Priority date: 2020-03-11
Filing date: 2021-03-01
Publication date: 2021-09-16
Also published as: CN111238288B; CN111238288A

Abstract

An ash removal apparatus and an ash removal method for a tubular heat exchanger, comprising a first drive plate (1), a second drive plate (2), ash removal rings (3), and a power mechanism (4); the first drive plate (1) and the second drive plate (2) are each provided with a plurality of through holes (5); heat exchange tubes (6) are slotted into the through holes of the drive plates; the ash removal rings (3) are arranged between the first drive plate (1) and the second drive plate (2) and are movably sleeved on the heat exchange tubes (6); the power mechanism (4) is connected to the first drive plate (1) and to the second drive plate (2); the first drive plate (1) or the second drive plate (2) is driven by the power mechanism to drive the ash removal rings (3) to move along the outer walls of the heat exchange tubes (6). By combining drive plates with ash removal rings, and by fitting said ash removal rings on heat exchange tubes, ash may be effectively removed from the outer walls of said heat exchange tubes. The invention has a simple structure and is quite practical.

Description

Dust removal device and dust removal method of tube heat exchanger

Technical field

The invention relates to the technical field of heat exchangers, in particular to an ash cleaning device and an ash cleaning method of a tubular heat exchanger.

Background technique

Tubular heat exchanger is a common energy-saving equipment that realizes heat transfer between fluids. It can transfer heat from a fluid with a higher temperature to a fluid with a lower temperature, effectively improving energy utilization. In some industrial fields, a large amount of high-temperature flue gas will be generated during the production process. Generally, the use of tube heat exchangers can solve the problem of flue gas waste heat recovery. However, the high-temperature flue gas produced by industry contains a large amount of dust or Broken slag, in the process of waste heat recovery, dust or broken slag is easy to adsorb or adhere to the outer wall of the heat exchange tube. Long-term accumulation of dust will reduce the heat exchange efficiency of the heat exchanger and seriously affect the normal use of the heat exchanger.

Traditional dust removal methods, such as pulse dust removal and scraping dust removal, have many problems when cleaning tube heat exchangers. For example, the pulse dust removal device is not only complicated in structure, cumbersome to operate, but also expensive and uneconomic to use; while the scraper dust removal device, due to the special tubular structure of the heat exchanger, is difficult to completely clean the dust on the heat exchange tube. And it is easy to get stuck when scraping and cleaning dust, which is not very practical.

Summary of the invention

In view of the above-mentioned defects in the prior art, the present invention provides a ash cleaning device and method for tube heat exchangers, which adopt a combination of a drive plate and a ash ring, and a combination of the ash ring and a heat exchange tube. The dust on the outer wall of the heat exchange tube is effectively removed, the structure is simple, and the practicability is strong.

The technical solutions adopted by the present invention to solve its technical problems are:

An ash cleaning device for a tube heat exchanger, which includes a first drive plate, a second drive plate, an ash cleaning ring and a power mechanism;

Both the first drive plate and the second drive plate are provided with a plurality of through holes, the heat exchange tube is sleeved in the through holes, and the dust cleaning ring is arranged on the first drive plate and the first drive plate. The two driving plates are movably sleeved on the heat exchange tube;

The power mechanism is connected to the first drive plate and the second drive plate, and the first drive plate or the second drive plate is driven by the power mechanism to drive the ash cleaning ring along the heat exchange The outer wall of the tube moves.

Further, there are multiple ash cleaning rings, and each heat exchange tube is sleeved with the ash cleaning ring.

Preferably, the heat exchange tube is arranged in a horizontal direction, and the first drive plate or the second drive plate is driven by a power mechanism to drive the ash cleaning ring to move in a horizontal direction along the outer wall of the heat exchange tube.

Further, the number of through holes on the first drive plate is consistent with the number of heat exchange tubes, and the number of through holes on the second drive plate is consistent with the number of heat exchange tubes.

Further, the inner diameter of the ash cleaning ring is larger than the diameter of the heat exchange tube, and the outer diameter of the ash cleaning ring is larger than the aperture of the through hole.

Preferably, the inner diameter of the ash cleaning ring is 1 to 3 mm larger than the diameter of the heat exchange tube.

Preferably, the outer diameter of the cleaning ring is 10-28 mm larger than the hole diameter of the through hole.

Further, a travel switch is provided at both ends of the heat exchange tube near the power mechanism.

Further, the power mechanism includes a motor, a sprocket, and a chain, the sprocket is arranged at both ends of the chain, and the chain is connected to the first drive plate and the second drive plate.

Another object of the present invention is to provide a method for cleaning heat exchange tubes by using the ash cleaning device of the above-mentioned tubular heat exchanger, the steps are as follows:

S1: The power mechanism drives the first drive plate and the second drive plate, the first drive plate pushes the ash cleaning ring to move toward one end of the heat exchange tube, and the ash cleaning ring scrapes off the Dust on the heat exchange tube;

S2: When the first drive plate pushes the ash cleaning ring to move to the edge of one end of the heat exchange tube, it stops moving;

S3: The power mechanism drives the first drive plate and the second drive plate, the second drive plate pushes the ash cleaning ring to move to the other end of the heat exchange tube, and the ash cleaning ring scrapes away Describe the dust on the heat exchange tube;

S4: When the second drive plate pushes the ash cleaning ring to move to the edge of the other end of the heat exchange tube, it stops moving;

S5: Repeat the above steps.

The beneficial effects of the present invention are:

(1) The ash cleaning ring is movably sleeved on the heat exchange tube and arranged between the two drive plates. Through the movement of the drive plate, the ash cleaning ring is driven to move back and forth on the outer wall of the heat exchange tube to continuously scrape off the heat exchange tube. The dust on the outer wall ensures the heat exchange efficiency of the heat exchange tube, the structure is simple, and the design is ingenious.

(2) The drive board is provided with a through hole. The diameter of the through hole is smaller than the outer diameter of the dust removal ring. During the cleaning process, the dust removal ring is strictly controlled between the two drive plates to ensure that the dust removal ring follows the drive Move while moving.

(3) The outer wall of each heat exchange tube is covered with a ash-removing ring, and the ash-removing rings do not interfere with each other. The damage or failure of one ash-removing ring will not affect the use of other ash-removing rings. The maintenance is simple, economical and practical. .

(4) The ash cleaning ring is movably sleeved on the heat exchange tube, and there is a gap of 1 to 3 mm between the ash cleaning ring and the heat exchange tube. Even if the heat exchange tube is bent, the ash cleaning ring will not be stuck, which is practical. powerful.

(5) The heat exchange tube is sleeved into the through hole on the drive plate. There is a large gap between the through hole and the heat exchange tube. The drive plate will not be jammed and failed due to the bending or deformation of the heat exchange tube. The hole diameter is smaller than the outer diameter of the cleaning ring, the specific shape and size of the through hole diameter are not strictly required, the design is reasonable, and the processing and manufacturing are simple.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a partial enlarged view of the part marked in Fig. 1.

Figure 3 is a schematic diagram of the structure of the ash cleaning ring in the present invention.

Fig. 4 is a schematic diagram of the structure of the first driving board or the second driving board in the present invention.

Fig. 5 is a schematic diagram of the position distribution of the first drive plate, the second drive plate and the dust cleaning ring in the present invention.

Fig. 6 is a schematic diagram of part of the structure of the present invention.

Fig. 7 is a side view of the present invention.

Fig. 8 is a top view of the first embodiment of the present invention.

Fig. 9 is a partial top view of the first embodiment of the present invention.

Fig. 10 is a top view of the second embodiment of the present invention.

Fig. 11 is a partial top view of the second embodiment of the present invention.

In the figure 1. The first drive plate, 2. The second drive plate, 3. The dust cleaning ring, 4. Power mechanism, 41. Motor, 42. Sprocket, 43. Chain, 44. First reducer, 45. Angle Steering gear, 46. Cross universal coupling, 47. Second reducer, 48. Power transmission shaft on both sides, 49. Drive arm, 5. Through hole, 6. Heat exchange tube, 7. Travel switch.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following further describes the present invention with reference to the accompanying drawings and embodiments.

As shown in Figures 1-4, the present invention provides a tube heat exchanger ash cleaning device, which includes a first drive plate 1, a second drive plate 2, an ash cleaning ring 3, and a power mechanism 4. The first drive plate 1 and the second drive plate 2 are provided with multiple through holes 5, the number of through holes 5 on the first drive plate 1 or the second drive plate 2 is not less than the number of heat exchange tubes 6, and the heat exchange tubes 6 are sleeved In the through hole 5, the ash cleaning ring 3 is arranged between the first drive plate 1 and the second drive plate 2, and the ash cleaning ring 3 is movably sleeved on the heat exchange tube 6.

When installing the present invention, firstly, align the through hole 5 on the first drive plate 1 with the corresponding heat exchange tube 6, and insert the first drive plate 1 from one end of the heat exchange tube 6, and then set the ash cleaning ring 3 Set the heat exchange tubes 6 one by one to ensure that each heat exchange tube 6 is covered with an ash cleaning ring 3. After that, align the through holes 5 on the second drive plate 2 with the corresponding heat exchange tubes 6, and then One end of the tube 6 is sleeved into the second drive plate 2 to ensure that the cleaning ring 3 is located between the first drive plate 1 and the second drive plate 2. The first drive plate 1 and the second drive plate 2 are combined into one through four shafts Overall, finally, the power mechanism 4 is connected to the first drive plate 1 and the second drive plate 2, ensuring that the first drive plate 1 and the second drive plate 2 are driven by the power mechanism 4 to drive the ash cleaning ring 3 along the heat exchange tube 6 Outer wall movement.

It can be seen from Figure 2 that there are multiple ash cleaning rings 3, and each heat exchange tube 6 is covered with a ash cleaning ring 3, and the ash cleaning rings 3 do not interfere with each other. Therefore, the damage of one ash cleaning ring 3 or Failure will not affect the use of other cleaning rings 3. The inner diameter of the ash cleaning ring 3 is greater than the diameter of the heat exchange tube 6, the outer diameter of the ash cleaning ring 3 is greater than the aperture of the through hole 5, and the ash cleaning ring 3 is strictly controlled between the first drive plate 1 and the second drive plate 2. , It is not connected with the power mechanism 4, and cannot move independently and regularly on the outer wall of the heat exchange tube 6, and can only be forced to move when the first drive plate 1 or the second drive plate 2 is moving, so as to continuously scrape off the dust on the outer wall of the heat exchange tube 6 , To ensure the heat exchange efficiency of the heat exchanger.

As shown in Figure 5-6, the ash cleaning ring 3 is movably sleeved on the heat exchange tube 6, and there is a gap of 1 to 3 mm between the ash cleaning ring 3 and the heat exchange tube 6. Even if the heat exchange tube 6 is bent, the dust is removed Ring 3 will not get stuck either. The heat exchange tube 6 is sleeved into the through holes 5 on the first drive plate 1 and the second drive plate 2, and there is a large gap between the through holes 5 and the heat exchange tube 6. The first drive plate 1 and the second drive plate 2 The heat exchange tube 6 will not be stuck due to the bending or deformation of the heat exchange tube 6. It is only necessary to ensure that the aperture of the through hole 5 is smaller than the outer diameter of the cleaning ring 3, and the specific shape and size of the aperture of the through hole 5 are not strictly required. , Simple processing and manufacturing. Preferably, the outer diameter of the cleaning ring 3 is 10-28 mm larger than the hole diameter of the through hole 5.

1 and 7, the power mechanism 4 includes a motor 41, a sprocket 42 and a chain 43. The sprocket 42 is arranged at both ends of the chain 43. The chain 43 is connected to the first drive plate 1 and the second drive plate 2 through a drive arm 49. In order to optimize the structure of the power mechanism 4, the present invention sets the number of the motor 41 to one, the heat exchanger is provided with two power transmission shafts 48 in the vertical direction of the drive plate movement, and one end of the power transmission shaft 48 on both sides is connected with the first A speed reducer 44, the first speed reducer 44 is connected with the motor 41, both ends of the power transmission shaft 48 are provided with angle converters 45, and the lower end of the angle converter 45 is connected with a cross universal coupling 46. The coupling 46 is provided with a second reducer 47 close to the sprocket 42, and the second reducer 47 is connected to the sprocket 42.

The process in which the power mechanism 4 drives the drive plate: the motor 41 is decelerated by the first reducer 44 and then outputs rotational power to the two ends of the first reducer 44, and the power is transmitted to the angle converters 45 at both ends by the power transmission shafts 48 on both sides. After that, the power is transmitted to the universal joint 46 through the angle converter 45. After the universal joint 46 receives the driving force, the power is transmitted to the sprocket 42 through the second reducer 47. After the sprocket 42 rotates The chain 43 is pulled to move, and the chain 43 further drives the first drive plate 1 and the second drive plate 2 to move through the drive arm 49 to continuously remove the dust on the outer wall of the heat exchange tube 6.

The present invention also provides a method for removing ash from the heat exchange tube by using the ash removal device of the above-mentioned tubular heat exchanger, and the steps are as follows:

S1: The power mechanism 4 drives the first drive plate 1 and the second drive plate 2, the first drive plate 1 pushes the ash cleaning ring 3 to one end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes the dust on the heat exchange tube 6 ；

S2: The first drive plate 1 pushes the ash cleaning ring 3 to move to the edge of one end of the heat exchange tube 6 and stops moving;

S3: The power mechanism 4 drives the first drive plate 1 and the second drive plate 2, and the second drive plate 2 pushes the ash cleaning ring 3 to move to the other end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes off the heat exchange tube 6 dust;

S4: The second driving plate 2 stops the movement when the ash cleaning ring 3 is pushed to the edge of the other end of the heat exchange tube 6;

S5: Repeat the above steps.

In order to further illustrate the technical solution of the present invention, the following specific embodiments are listed:

Example 1:

As shown in Figures 8-9, the heat exchange tube 6 is arranged in the horizontal direction. Driven by the power mechanism 4, the first drive plate 1 and the second drive plate 2 push the cleaning ring 3 to the left and right along the horizontal direction of the outer wall of the heat exchange tube 6 Back and forth movement.

The number of through holes 5 on the first drive plate 1 is the same as the number of heat exchange tubes 6, and the number of through holes 5 on the second drive plate 2 is the same as the number of heat exchange tubes 6, and both ends of the heat exchange tubes 6 are close to the power mechanism 4. There is a travel switch 7 everywhere.

The cleaning process is as follows:

S1: After the motor 41 is decelerated by the first reducer 44, it outputs rotational power to the two ends of the first reducer 44, and the power is transmitted to the angle converters 45 at both ends by the power transmission shafts 48 on both sides;

S2: The power transmission shafts 48 on both sides respectively transmit the power to the angle converters 45 at both ends, and then the power is transmitted to the cross universal coupling 46 through the angle converter 45;

S3: After the cross universal joint 46 receives the driving force, the power is transmitted to the sprocket 42 through the second reducer 47, and the sprocket 42 rotates to pull the chain 43 to move;

S4: The chain 43 drives the first drive plate 1 and the second drive plate 2 through the drive arm 49, and then the first drive plate 1 pushes the ash cleaning ring 3 to the right end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes the heat exchange tube 6 dust on;

S5: The first drive plate 1 pushes the ash cleaning ring 3 to move to the limit switch 7 at the right end of the heat exchange tube 6 and stops moving;

S6: The chain 43 drives the first drive plate 1 and the second drive plate 2 through the drive arm 49, and then the second drive plate 2 pushes the ash cleaning ring 3 to move to the left end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes the heat exchange tube 6 dust on;

S7: The second drive plate 2 pushes the ash cleaning ring 3 to move to the limit switch 7 at the left end of the heat exchange tube 6 and stops moving;

S8: Repeat the above steps.

The first drive plate 1 and the second drive plate 2 push the ash cleaning ring 3 to automatically move back and forth between the two travel switches 7. The ash cleaning ring 3 continuously scrapes off the dust on the outer wall of the heat exchange tube 6 and keeps the heat exchange tube 6 at all times. The outer wall is in a dust-free state, which improves the heat exchange efficiency of the heat exchanger and saves energy.

Example 2:

As shown in Figure 10, the heat exchange tube 6 is arranged in the vertical direction, and the first drive plate 1 and the second drive plate 2 are driven by the power mechanism 4 to push the cleaning ring 3 up and down along the vertical direction of the outer wall of the heat exchange tube 6 .

The cleaning process is as follows:

S3: After the cross universal joint 46 receives the driving force, the power is transmitted to the sprocket 42 through the second reducer 47, and the sprocket 42 rotates and pulls the chain 43 to move;

S4: The chain 43 drives the first drive plate 1 and the second drive plate 2 through the drive arm 49, and then the first drive plate 1 pushes the ash cleaning ring 3 to move to the lower end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes the heat exchange tube 6 dust on;

S5: The first drive plate 1 pushes the ash cleaning ring 3 to move to the limit switch 7 at the lower end of the heat exchange tube 6 and stops moving;

S6: The chain 43 drives the first drive plate 1 and the second drive plate 2 through the drive arm 49, and then the second drive plate 2 pushes the ash cleaning ring 3 to move to the upper end of the heat exchange tube 6, and the ash cleaning ring 3 scrapes the heat exchange tube 6 dust on;

S7: The second drive plate 2 pushes the ash cleaning ring 3 to move to the limit switch 7 at the upper end of the heat exchange tube 6 and stops moving;

S8: Repeat the above steps.

The foregoing descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention. within.

Claims

A tube heat exchanger ash cleaning device, which is characterized in that it comprises a first drive plate (1), a second drive plate (2), an ash cleaning ring (3) and a power mechanism (4). Both the driving board (1) and the second driving board (2) are provided with a plurality of through holes (5), the heat exchange tube (6) is sleeved in the through holes (5), and the dust cleaning The ring (3) is arranged between the first drive plate (1) and the second drive plate (2) and is movably sleeved on the heat exchange tube (6), and the power mechanism (4) is connected to the The first driving board (1) and the second driving board (2), the first driving board (1) or the second driving board (2) is driven by the power mechanism (4) to drive the The ash cleaning ring (3) moves along the outer wall of the heat exchange tube (6).
The ash removal device of a tubular heat exchanger according to claim 1, characterized in that there are multiple ash removal rings (3), and each heat exchange tube (6) is sheathed Describe the cleaning ring (3).
The ash cleaning device of a tubular heat exchanger according to claim 1, wherein the heat exchange tubes (6) are arranged in a horizontal direction, and the first drive plate (1) or the second drive The plate (2) is driven by the power mechanism (4) to drive the ash cleaning ring (3) to move in the horizontal direction along the outer wall of the heat exchange tube (6).
The ash cleaning device of a tube heat exchanger according to claim 1, wherein the number of through holes (5) on the first drive plate (1) is equal to that of the heat exchange tubes (6). The number is the same, and the number of the through holes (5) on the second drive plate (2) is the same as the number of the heat exchange tubes (6).
The ash removal device of a tubular heat exchanger according to claim 1, characterized in that the inner diameter of the ash removal ring (3) is greater than the diameter of the heat exchange tube (6), and the ash removal The outer diameter of the ring (3) is larger than the hole diameter of the through hole (5).
The ash cleaning device of a tubular heat exchanger according to claim 5, characterized in that the inner diameter of the ash cleaning ring (3) is 1 to 3 mm larger than the diameter of the heat exchange tube (6).
The ash cleaning device of a tubular heat exchanger according to claim 5, characterized in that the outer diameter of the ash cleaning ring (3) is 10-28 mm larger than the hole diameter of the through hole (5).
The ash cleaning device of a tubular heat exchanger according to claim 1, characterized in that, a travel switch (7) is provided at both ends of the heat exchange tube (6) near the power mechanism (4). .
The dust removal device of a tubular heat exchanger according to claim 1, wherein the power mechanism (4) includes a motor (41), a sprocket (42) and a chain (43), and the chain Wheels (42) are arranged at both ends of the chain (43), and the chain (43) is connected with the first drive plate (1) and the second drive plate (2).
A method for cleaning ash by using the ash cleaning device of the tube heat exchanger according to any one of claims 1-9, characterized in that:

S1: The power mechanism (4) drives the first drive plate (1) and the second drive plate (2), and the first drive plate (1) pushes the ash cleaning ring (3) to reverse One end of the heat pipe (6) moves, and the dust cleaning ring (3) scrapes off the dust on the heat exchange pipe (6);

S2: The first drive plate (1) pushes the ash cleaning ring (3) to move to one end of the heat exchange tube (6) and stops moving;

S3: The power mechanism (4) drives the first drive plate (1) and the second drive plate (2), and the second drive plate (2) pushes the ash cleaning ring (3) to reverse The other end of the heat pipe (6) moves, and the dust cleaning ring (3) scrapes off the dust on the heat exchange pipe (6);

S4: When the second driving plate (2) pushes the ash cleaning ring (3) to move to the other end of the heat exchange tube (6), it stops moving;

S5: Repeat the above steps.