Online ash removal rod structure of heat energy recoverer

Abstract

The invention relates to the technical field of heat energy recovery systems, in particular to an online ash removal rod structure of a heat energy recoverer, which is used for removing ash on the inner wall of a heat exchange tube of the heat energy recoverer. The waterway unit is used for connecting cooling water; wherein the water path unit is connected to the outer side of the gas path unit, the water path unit forms a circulating water path on the outer side of the gas path unit, and the water path unit is provided with a connector connected with the starting end and the stopping end of the circulating water path. In the ash removal process of the ash removal rod, cooling water is continuously introduced into the water path unit, so that the whole ash removal rod is cooled, the strength of the ash removal rod is improved, the deformation of the front end of the ash removal rod in a high-temperature environment is small, the requirement that the ash removal rod can smoothly and linearly penetrate into a heat exchange pipe from an ash removal hole in a smoke box end plate is met, and the ash removal function is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of heat recovery systems, and in particular to an online dust cleaning rod structure of a heat recovery device. Background Art

[0002] In the heat recovery system, the heat recovery device is one of the core equipment. In particular, in some applications, horizontal shell and tube heat exchangers are widely used. These heat exchangers usually process process gases that have undergone high-temperature cracking. The process gas first enters the inlet smoke box of the heat exchanger and then flows in the tube side. During this process, the system maintains a slightly negative pressure state. After heat exchange, the process gas enters the outlet smoke box and continues to the next process flow. At the same time, the cooling medium flows in the shell side to achieve heat recovery.

[0003] However, in the heat exchanger outlet smoke box, the temperature of the process gas is usually very high (> 450°C), which leads to the formation of furnace ash. The formation of furnace ash is mainly caused by two factors: first, the complex composition of the process gas generates salts or oxides during the cracking process; second, undesirable cracking reaction conditions, such as drastic changes in feed composition and flow rate, or drastic changes in fuel gas composition, may lead to lack of oxygen or insufficient residence time, and then form ash and coke, which will adhere to the inner wall of the heat exchange tube.

[0004] Ash accumulation and coking increase the resistance of the heat exchange tubes, affecting the pressure distribution of the system, which may cause the regeneration furnace to be unable to maintain negative pressure, and in severe cases, it may even require shutdown for treatment; secondly, the heat exchange effect decreases, causing system temperature imbalance, which may also require shutdown in severe cases; finally, the ash sticks to the furnace tubes, causing uneven heating and forming thermal stress, which may cause serious problems such as tube bursts.

[0005] In order to solve these problems, the existing heat recovery device needs to use a cleaning rod to continuously clean the inner hole of the heat exchange tube during operation. The cleaning process includes opening the pressure cover of each cleaning port in turn, inserting the cleaning rod through the cleaning port, penetrating the entire heat exchange tube and then withdrawing it, then closing the cleaning port pressure cover and continuing to clean the next cleaning port. However, due to the large distance H (>3000mm) between the outlet smoke box end plate and the heat recovery device outlet end plate, and the high internal temperature (>450℃), the cleaning rod is easily deformed by heat in a high temperature environment. This deformation causes the cleaning rod to be unable to accurately penetrate the heat exchange tube of the heat recovery device corresponding to the cleaning hole, thereby failing to effectively complete the cleaning action. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art that the cleaning rod is easily deformed by heat in a high temperature environment, and such deformation causes the cleaning rod to be unable to accurately penetrate into the heat exchange tube of the heat energy recovery device corresponding to the cleaning hole, thereby failing to effectively complete the cleaning action, and an online cleaning rod structure for a heat energy recovery device is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: Design an online cleaning rod structure for heat recovery device to clean the inner wall of the heat exchange tube of the heat recovery device: It includes an air circuit unit for connecting compressed air; and a water channel unit for connecting cooling water; The water circuit unit is connected to the outside of the gas circuit unit, and the water circuit unit forms a circulating water circuit outside the gas circuit unit. A joint connecting the starting and ending ends of the circulating water circuit is arranged on the water circuit unit.

[0008] Furthermore, the gas circuit unit comprises: An inner tube and a head end, wherein a blind hole is provided on the inner side of the head end, wherein the inner tube is inserted and fixed in the blind hole, wherein a plurality of gas outlets connected to the blind hole are distributed on the outer peripheral surface of the head end.

[0009] Furthermore, both ends of the head end are in a conical structure, and the outer diameter of the middle part is smaller than the inner diameter of the heat exchange tube.

[0010] Furthermore, the water channel unit includes a middle tube sleeved on the outside of the inner tube, and an outer tube sleeved on the outside of the middle tube; A first gap is formed between the middle tube and the inner tube, and a second gap is formed between the outer tube and the middle tube.

[0011] Furthermore, one end of the outer tube is fixed and sealed to the head end, and the other end is fixed and sealed to the inner tube through a blind plate.

[0012] Furthermore, the blind plate is fixed to the inner side of the end of the outer tube, and the end of the inner tube passes through the blind plate and extends outward.

[0013] Furthermore, the outer diameter of the outer tube is smaller than the outer diameter of the head end.

[0014] Furthermore, one end of the middle tube is fixed and sealed on the blind plate, and the other end of the middle tube is a predetermined distance away from the head end to form a reflux port; The cooling water flows along the first gap and into the second gap through the reflux port to form a circulating water path.

[0015] Furthermore, two connectors are provided, and the two connectors are respectively connected to the first gap and the second gap.

[0016] Furthermore, the inner tube, outer tube and middle tube are all configured as metal tubes.

[0017] The present invention proposes an online cleaning rod structure for a heat energy recovery device, which has the beneficial effect that a water channel unit is added to the outside of the air channel unit. During the cleaning process of the cleaning rod, cooling water is continuously introduced into the water channel unit, thereby achieving cooling of the entire cleaning rod, thereby improving the strength of the cleaning rod, and making the deformation of the front end of the cleaning rod in a high-temperature environment small enough to ensure that the cleaning rod can smoothly penetrate straight into the heat exchange tube from the cleaning hole on the end plate of the smoke box, thereby realizing the cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a state diagram of the dust cleaning rod of the present invention being inserted into the heat exchange tube; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A.

[0019] In the figure: 1. heat recovery device; 11. heat exchange tube; 12. smoke box end plate; 2. gas circuit unit; 21. inner tube; 22. head end; 23. blind hole; 24. gas outlet; 3. water circuit unit; 31. middle tube; 32. outer tube; 33. blind plate; 34. return port; 4. joint. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figure 1-3 An embodiment of the present invention discloses an online cleaning rod structure for a heat recovery device, which is used to clean the inner wall of a heat exchange tube 11 of a heat recovery device 1, and is used to solve the problem that the cleaning rod is deformed by heat during the cleaning process due to being in a high temperature environment, and cannot be inserted into the heat exchange tube in a straight line afterwards; Specifically, if Figure 1 As shown, a smoke box end plate 12 is provided on one side of the heat energy recovery device 1, and a plurality of ash cleaning ports are provided at intervals on the end surface of the smoke box end plate 12, and the plurality of ash cleaning ports are opposite to each heat exchange tube 11 inside the heat energy recovery device 1 one by one, wherein a pressure cover is detachably connected to the outer side of the ash cleaning port, and the ash cleaning port is closed after the ash cleaning is completed. During operation, the flue gas enters along the right side of the heat energy recovery device 1, and is discharged along the top left side of the heat energy recovery device 1 after heat exchange through the heat exchange tube 11.

[0022] Specifically, the dust cleaning rod structure described in this embodiment includes an air circuit unit 2 for connecting compressed air; and a water circuit unit 3 for connecting cooling water; The water circuit unit 3 is connected to the outside of the gas circuit unit 2 , and forms a circulating water circuit on the outside of the gas circuit unit 2 . A joint 4 is provided on the water circuit unit 3 to connect the starting and ending ends of the circulating water circuit.

[0023] That is to say, in this embodiment, a water circuit unit 3 is added to the outside of the air circuit unit 2. During the cleaning process of the cleaning rod, cooling water is continuously passed through the water circuit unit 3, thereby achieving cooling of the entire cleaning rod, thereby improving the strength of the cleaning rod, and making the deformation of the front end of the cleaning rod in a high temperature environment small enough to allow the cleaning rod to smoothly pass straight through the cleaning hole on the smoke box end plate 12 into the heat exchange tube 11, thereby realizing the cleaning function.

[0024] In some embodiments, the gas circuit unit 2 in the present invention includes: An inner tube 21 and a head end 22, wherein a blind hole 23 is provided on the inner side of the head end 22, wherein the inner tube 21 is inserted and fixed in the blind hole 23. In a further embodiment, the connection between the inner tube 21 and the head end 22 in the present invention is fixed by full circumferential welding to ensure that no leakage occurs, wherein a plurality of gas outlets 24 connected to the blind holes 23 are distributed on the outer circumferential surface of the head end 22. Specifically, in this embodiment, the aperture of the gas outlet 24 is smaller than the aperture of the blind hole 23. Preferably, in this embodiment, the hole axis centerline of the gas outlet 24 is not perpendicular to the hole axis centerline of the blind hole 23. In this embodiment, the gas outlet 24 is inclined away from the side of the inner tube 21 to ensure that the airflow can be discharged toward the front end during the cleaning process, thereby pushing the dust in the heat exchange tube 11 forward and optimizing the cleaning effect.

[0025] On the basis of the above-mentioned embodiments, both ends of the head end 22 in this embodiment are conical structures, and the outer diameter of the middle part is smaller than the inner diameter of the heat exchange tube 11. That is, in this embodiment, the maximum diameter of the head end 22 is designed to be smaller than the inner diameter of the heat exchange tube 11, so that it can be ensured that the head end 22 can move freely on the inner side of the heat exchange tube 11 to avoid jamming.

[0026] Furthermore, the water channel unit 3 in this embodiment includes a middle tube 31 sleeved on the outside of the inner tube 21, and an outer tube 32 sleeved on the outside of the middle tube 31; Among them, a first gap is formed between the middle tube 31 and the inner tube 21, and a second gap is formed between the outer tube 32 and the middle tube 31. Specifically, in this embodiment, the values ​​of the first gap and the second gap are the same, that is, the inner tube 21, the middle tube 31 and the outer tube 32 in this embodiment are arranged in an equidistant manner to ensure that the cooling water can flow evenly and improve the stability of the water flow.

[0027] Preferably, one end of the outer tube 32 in the present embodiment is fixed and sealed to the head end 22, and the other end is fixed and sealed to the inner tube 21 through a blind plate 33. Specifically, the outer tube 32 in the present embodiment and the head end 22 are fixed by full circumferential welding to prevent leakage. The blind plate 33 is sleeved on the outside of the inner tube 21, and the blind plate 33 can also be fixed between the inner tube 21 and the outer tube 32 by full circumferential welding.

[0028] In some embodiments, the blind plate 33 of the present invention is fixed to the inner side of the end of the outer tube 32, and the end of the inner tube 21 extends outward through the blind plate 33. The structural design of the inner tube 21 extending outward can realize the convenient connection of the port of the inner tube 21 to the gas path, and the outer end surface of the blind plate 33 remains flush with the end of the outer tube 32.

[0029] Of course, those skilled in the art know that, in order to ensure smooth insertion of the outer tube 32 in the present embodiment, the outer diameter of the outer tube 32 in the present embodiment is smaller than the outer diameter of the head end 22. This structural design is adopted to facilitate welding between the outer tube 32 and the head end 22, and on the other hand, it can ensure free insertion of the outer tube 32 in the heat exchange tube 11.

[0030] Preferably, in this embodiment, one end of the middle tube 31 is fixed and sealed on the blind plate 33, and the connection method can also be a circumferential full welding method. The other end of the middle tube 31 is a predetermined distance away from the head end 22 to form a return port 34. The cooling water flows along the first gap and into the second gap through the reflux port 34 to form a circulating water path.

[0031] In addition, in this embodiment, two joints 4 are provided, and the two joints 4 are respectively connected to the first gap and the second gap. Specifically, in this embodiment, one joint 4 passes through the outer tube 32 and extends to the first gap, and the other joint 4 passes through the outer tube 32 and the middle tube 31 and extends to the second gap.

[0032] In addition, the inner tube 21, the outer tube 32 and the middle tube 31 in this embodiment are all configured as metal tubes.

[0033] During the specific dust removal operation, first connect the inner tube 21 to the external compressed cold air and connect it to the external circulating water supply equipment through the joint 4; The circulating water enters the first gap along the upper joint 4, then enters the second gap through the reflux port 34, and finally is discharged outward along the lower joint 4, thus forming a complete water flow process; At this time, the head end 22 of the cleaning rod can be inserted into the heat exchange tube 11 along the cleaning port on the end face of the smoke box end plate 12, and the inner wall of the heat exchange tube 11 can be cleaned and purged through the cooler to recover the accumulated ash in the heat exchange tube. At the same time, the circulating cooling water can enhance the overall high temperature resistance of the device to reduce the deformation of the front end of the cleaning rod, so that the cleaning rod can be smoothly reciprocated and penetrated into each heat exchange tube 11 to realize the cleaning function.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat recovery device online dust cleaning rod structure, used for cleaning the inner wall of a heat exchange tube (11) of a heat recovery device (1), characterized in that: It comprises an air circuit unit (2) for connecting compressed air; and a water channel unit (3) for connecting cooling water; The water circuit unit (3) is connected to the outside of the gas circuit unit (2), the water circuit unit (3) forms a circulating water circuit on the outside of the gas circuit unit (2), and a joint (4) connecting the starting and ending ends of the circulating water circuit is provided on the water circuit unit (3).

2. The online dust cleaning rod structure of a heat recovery device according to claim 1 is characterized in that: The gas circuit unit (2) comprises: An inner tube (21) and a head end (22), wherein a blind hole (23) is provided on the inner side of the head end (22), and the inner tube (21) is inserted into and fixed in the blind hole (23), wherein a plurality of gas outlets (24) connected to the blind hole (23) are distributed on the outer peripheral surface of the head end (22).

3. The online dust cleaning rod structure of a heat recovery device according to claim 2 is characterized in that: Both ends of the head end (22) are in a conical structure, and the outer diameter of the middle portion is smaller than the inner diameter of the heat exchange tube (11).

4. The online dust cleaning rod structure of a heat recovery device according to claim 2 is characterized in that: The water channel unit (3) comprises a middle tube (31) sleeved on the outside of the inner tube (21), and an outer tube (32) sleeved on the outside of the middle tube (31); A first gap is formed between the middle tube (31) and the inner tube (21), and a second gap is formed between the outer tube (32) and the middle tube (31).

5. The online dust cleaning rod structure of a heat recovery device according to claim 4 is characterized in that: One end of the outer tube (32) is fixed and sealed to the head end (22), and the other end is fixed and sealed to the inner tube (21) via a blind plate (33).

6. The online dust cleaning rod structure of a heat recovery device according to claim 5, characterized in that: The blind plate (33) is fixed to the inner side of the end of the outer tube (32), and the end of the inner tube (21) passes through the blind plate (33) and extends outward.

7. The online dust cleaning rod structure of a heat recovery device according to claim 4 is characterized in that: The outer diameter of the outer tube (32) is smaller than the outer diameter of the head end (22).

8. The online dust cleaning rod structure of a heat recovery device according to claim 4, characterized in that: One end of the middle tube (31) is fixed and sealed on the blind plate (33), and the other end of the middle tube (31) is spaced a predetermined distance from the head end (22) to form a reflux port (34); Cooling water flows along the first gap and into the second gap via the reflux port (34) to form a circulating water path.

9. The online dust cleaning rod structure of a heat recovery device according to claim 5, characterized in that: Two joints (4) are provided, and the two joints (4) are respectively connected to the first gap and the second gap.

10. An online dust cleaning rod structure for a heat recovery device according to any one of claims 4 to 9, characterized in that: The inner tube (21), the outer tube (32) and the middle tube (31) are all configured as metal tubes.

Images