Online ash removal rod structure of heat energy recoverer

Abstract

The utility model 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 which is 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 utility model relates to the technical field of heat energy recovery systems, in particular to an online dust cleaning rod structure of a heat energy recovery device. Background Art

[0002] In heat recovery systems, heat recovery units are a core component. Horizontal shell-and-tube heat exchangers are particularly popular in some applications. These heat exchangers typically process process gases that have undergone high-temperature cracking. The process gas first enters the heat exchanger's inlet smoke box and then flows through the tube side, where the system maintains a slightly negative pressure. After heat exchange, the process gas enters the outlet smoke box and continues to the next process flow. Simultaneously, a cooling medium flows through the shell side, recovering heat.

[0003] However, the process gas temperature in the heat exchanger outlet smoke box is typically very high (>450°C), which leads to the formation of ash. Ash formation is primarily 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, can lead to oxygen deficiency or insufficient residence time, resulting in ash and coke accumulation, which adheres to the inner walls of the heat exchange tubes.

[0004] Ash and coke accumulation 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. In severe cases, it may even require shutdown for treatment. Secondly, the heat exchange effect decreases, causing the system temperature to be unbalanced, which may also require shutdown in severe cases. Finally, the ash sticks to the furnace tubes, resulting in uneven heating and forming thermal stress, which may cause serious problems such as tube bursts.

[0005] To address these issues, existing heat recovery units require the use of cleaning rods to continuously clean the inner bores of the heat exchange tubes during operation. The cleaning process involves opening the glands at each cleaning port, inserting the cleaning rod through the port, and withdrawing it after passing through the entire heat exchange tube. The glands are then closed and the cleaning continues at the next port. However, due to the large distance H (>3000mm) between the outlet smoke box end plate and the heat recovery unit outlet end plate, and the high internal temperature (>450°C), the cleaning rods are susceptible to thermal deformation in high-temperature environments. This deformation prevents the cleaning rods from accurately penetrating the heat exchange tubes corresponding to the cleaning holes in the heat recovery unit, making the cleaning process ineffective. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings in the prior art that the cleaning rod is easily deformed by heat in a high-temperature environment, and 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. An online cleaning rod structure for a heat recovery device is proposed.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] 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:

[0009] including an air circuit unit for connecting compressed air;

[0010] and a water channel unit for connecting cooling water;

[0011] The water channel unit is connected to the outside of the gas channel unit, and forms a circulating water channel on the outside of the gas channel unit. A joint connecting the starting and ending ends of the circulating water channel is provided on the water channel unit.

[0012] Furthermore, the gas circuit unit includes:

[0013] The inner tube and the head end are provided with a blind hole on the inner side of the head end, the inner tube is inserted and fixed in the blind hole, and a plurality of gas outlets connected with the blind hole are distributed on the outer peripheral surface of the head end.

[0014] 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.

[0015] 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;

[0016] 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.

[0017] 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 via a blind plate.

[0018] Furthermore, the blind plate is fixed to the inner side of the end portion of the outer tube, and the end portion of the inner tube passes through the blind plate and extends outward.

[0019] Furthermore, the outer diameter of the outer tube is smaller than the outer diameter of the head end.

[0020] Furthermore, one end of the middle tube is fixed and sealed on the blind plate, and the other end of the middle tube is spaced a predetermined distance from the head end to form a reflux port;

[0021] Cooling water flows along the first gap and into the second gap through the reflux port to form a circulating water path.

[0022] Furthermore, two connectors are provided, and the two connectors are connected to the first gap and the second gap respectively.

[0023] Furthermore, the inner tube, outer tube and middle tube are all configured as metal tubes.

[0024] The utility model proposes an online cleaning rod structure for a heat energy recovery device, which has the beneficial effect that: in the utility model, a water channel unit is added to the outside of the air channel unit, and cooling water is continuously introduced into the water channel unit during the cleaning process of the cleaning rod, thereby achieving cooling of the entire cleaning rod, thereby improving the strength of the cleaning rod, and making the deformation of its front end in a high-temperature environment small enough to ensure that the cleaning rod can smoothly pass straightly from the cleaning hole on the end plate of the smoke box into the heat exchange tube, thereby realizing the cleaning function. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a state diagram of the utility model where the dust cleaning rod is inserted into the heat exchange tube;

[0026] Figure 2 It is a structural diagram of the utility model;

[0027] Figure 3 for Figure 2 Schematic diagram of the enlarged structure of area A.

[0028] In the figure: 1. Heat energy 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. Connector. DETAILED DESCRIPTION

[0029] 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.

[0030] Reference Figure 1-3 This is an embodiment of the present invention, which discloses an online cleaning rod structure for a heat energy recovery device. The cleaning rod structure is used to clean the inner wall of the heat exchange tube 11 of the heat energy recovery device 1. It is used to solve the problem that the cleaning rod is deformed by heat in a high temperature environment during the cleaning process, resulting in the subsequent inability to be inserted straight into the heat exchange tube.

[0031] Specifically, if Figure 1As shown, a smoke box end plate 12 is provided on one side of the heat energy recovery device 1, and a number of ash cleaning ports are provided at intervals on the end surface of the smoke box end plate 12. The ash cleaning ports are opposite to the heat exchange tubes 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. After the ash cleaning is completed, the ash cleaning port is closed. During operation, the flue gas enters along the right side of the heat energy recovery device 1, and after heat exchange through the heat exchange tube 11, it is discharged along the top left side of the heat energy recovery device 1.

[0032] Specifically, the dust cleaning rod structure described in this embodiment includes an air circuit unit 2 for connecting to compressed air; and a water circuit unit 3 for connecting to cooling water;

[0033] The water channel unit 3 is connected to the outside of the gas channel unit 2 , and forms a circulating water channel on the outside of the gas channel unit 2 . A joint 4 is provided on the water channel unit 3 to connect the starting and ending ends of the circulating water channel.

[0034] That is to say, in this embodiment, a water channel unit 3 is added to the outside of the air channel unit 2. During the cleaning process of the cleaning rod, cooling water is continuously introduced into the water channel unit 3, thereby achieving cooling of the entire cleaning rod, thereby improving the strength of the cleaning rod, and making the deformation of its front end in a high-temperature environment small enough to ensure that the cleaning rod can 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.

[0035] In some embodiments, the gas circuit unit 2 in the present invention includes:

[0036] The inner tube 21 and the head end 22 have a blind hole 23 on the inner side of the head end 22, and 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 utility model adopts a circumferential full welding fixing method to ensure that no leakage occurs, wherein a plurality of air 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 air outlet 24 is smaller than the aperture of the blind hole 23. Preferably, in this embodiment, the hole axis of the air outlet 24 is not perpendicular to the hole axis of the blind hole 23. In this embodiment, the air 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, so that the dust in the heat exchange tube 11 can be pushed forward and the cleaning effect can be optimized.

[0037] On the basis of the above embodiment, the two 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. In this way, it can be ensured that the head end 22 can move freely inside the heat exchange tube 11 to avoid jamming.

[0038] Furthermore, in this embodiment, the water channel unit 3 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;

[0039] 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.

[0040] Preferably, one end of the outer tube 32 in this 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 this embodiment and the head end 22 are also fixed by a full circumferential welding method 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 a full circumferential welding method.

[0041] In some embodiments, the blind plate 33 in 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 passes through the blind plate 33 and extends outward. 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 secondly, the outer end surface of the blind plate 33 remains flush with the end of the outer tube 32.

[0042] Of course, those skilled in the art know that in order to ensure the smooth insertion of the outer tube 32 in this embodiment, the outer diameter of the outer tube 32 in this 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 the free insertion of the outer tube 32 in the heat exchange tube 11.

[0043] 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 full circumference 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.

[0044] The cooling water flows along the first gap and into the second gap through the reflux port 34 to form a circulating water path.

[0045] In addition, in this embodiment, there are two joints 4, 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.

[0046] In addition, the inner tube 21 , the outer tube 32 and the middle tube 31 in this embodiment are all configured as metal tubes.

[0047] During the specific dust cleaning 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 connector 4;

[0048] The circulating water enters the first gap along the upper joint 4, then enters the second gap through the return port 34, and finally is discharged outward along the lower joint 4, thus forming a complete water flow process;

[0049] 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 dust 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. In this way, the cleaning rod can smoothly reciprocate and penetrate into each heat exchange tube 11 to realize the cleaning function.

[0050] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of 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 by: It includes 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), and the water circuit unit (3) forms a circulating water circuit on the outside of the gas circuit unit (2). A joint (4) connecting the starting and ending ends of the circulating water circuit is provided on the water circuit unit (3).

2. The heat recovery device online dust cleaning rod structure according to claim 1, 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, 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 heat recovery device online dust cleaning rod structure 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, 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 5, 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 heat recovery device online dust cleaning rod structure according to claim 5, characterized in that: Two joints (4) are provided, and the two joints (4) are connected to the first gap and the second gap respectively.

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.

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