Ash discharging device for smoke box of waste heat exchanger in acid cracking process
Dust collection and ash discharge through smoke metal expansion joints and motor-driven telescopic rods, solving the corrosion of water sealing methods and equipment damage in screw conveying methods, ensuring equipment safety and operation safety.
Patent Information
- Application Number
- CN202322875020.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-26
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2033-10-26
AI Technical Summary
In the existing acid cracking process, the water sealing method collects furnace ash with water vapor corrosion, acidic water corrosion and system negative pressure problems, which increases cost and workload; while the screw conveying method is easy to damage at high temperatures and increases equipment complexity. Endangering the health of staff.
The smoke metal expansion joint and the motor-driven telescopic rod are used to achieve airtight fit and separation through the meshing of the transmission rod and the gear texture, avoiding direct contact between the motor and the high temperature, and designing a dual-container and logic control system to operate remotely.
It extends the service life of the motor, reduces the complexity of the equipment and the failure rate, avoids personnel working at high temperatures, and achieves a safe and reliable dust collection and ash removal process.
Smart Images
Figure CN222352911U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of chemical production equipment, and specifically discloses a smoke box ash discharge device for a waste heat exchanger in an acid cracking process. Background Art
[0002] Waste acid is a common hazardous chemical waste in chemical production. The most environmentally friendly process in chemical production is the waste acid cracking and regeneration process. In the waste acid cracking and regeneration process, the temperature of the furnace gas discharged from the cracking furnace is as high as 1100°C. Since the furnace gas contains a large amount of moisture and ash, the flue gas must be washed and purified before entering the subsequent process. The furnace gas must be cooled before washing and purifying it. The waste heat exchanger as a cooling device is undoubtedly the most common choice in the existing technology. The waste heat exchanger recycles the high-level heat energy in the furnace gas, which not only saves energy, but also greatly reduces the operating cost of the device.
[0003] The waste heat exchanger comprises a front smoke box, a body and a rear smoke box which are connected in sequence, wherein a plurality of heat exchange tubes are arranged inside the body, and a central tube is arranged at the center of the body, a regulating valve is arranged at the outlet of the central tube, the inlet of the heat exchange tube and the inlet of the central tube are connected to the front smoke box, and the outlet of the heat exchange tube and the outlet of the central tube are connected to the rear smoke box. The waste heat exchanger has a long service life, low construction cost, convenient operation and saves floor space.
[0004] During the washing and purification process, the front smoke box and the rear smoke box serve as ash collecting devices to collect substances such as sulfide ash and nitrogen oxide ash in the cracking gas.
[0005] Some enterprises adopt water seal to collect ash in cracking furnace, but this method has the following disadvantages: 1. The normal temperature of cracking furnace gas is 1000-1200℃, and the gas in the ash collecting device is at least 600-900℃. The water in the water seal evaporates quickly, and water vapor easily enters the furnace gas to cause equipment corrosion, affecting the SO2 concentration, temperature and O2 content in the furnace gas, causing system instability; 2. The water in the water seal easily absorbs SO3 in the furnace gas to form acidic water to corrode the ash drop pipe; 3. The acidic water in the water seal tank is not easy to change due to the negative pressure of the system, and water is easily brought into the system during the water change process; 4. After the water is changed, the water composition in the water seal is complex. According to the different cracking raw materials and process sections, it contains carbon black, minerals, inorganic salts, sulfides, hydrates of sulfides, and hydrates of nitrogen oxides. After pressure filtration, the filter cake is subject to the management of relevant national laws and regulations as hazardous waste and is handled by environmental protection enterprises with relevant qualifications, which increases the cost and daily workload of the enterprise.
[0006] In some enterprises, in order to avoid the mixing of acid and solid waste leading to the generation of hazardous waste, water seals are removed and electrostatic precipitators are added to the ash discharge port to make the tail gas fall under the action of static electricity. According to experience, when a certain dust content is reached, the ash discharge pipe is manually disassembled. However, this work requires the ash discharge pipe to be manually removed and sealed with a blind plate. In this process, the handling staff are actually exposed to the influence range of the cracking furnace exhaust gas. The waste acid cracking furnace exhaust gas may contain SO2, SO3, NO due to different cracking raw materials and different processes. X , and even substances such as dioxins, which seriously endanger the physical and mental health of workers.
[0007] In some enterprises, screw conveying is used to convey ash in cracking furnaces. Although this method is feasible at room temperature, the conveying screw in the collecting box needs to work at 600-900℃, and the motor connected to the screw works at high temperature for a long time and is easy to be damaged. In addition, the screw is passed through the ash collecting box. In the positive pressure and high temperature corrosive gas environment in the ash collecting box, long-term use often destroys the sealing of the ash collecting box. Under the action of strong corrosive gas, the corrosive gas is prone to leakage. In addition, the existence of the conveying screw increases the complexity of the interior of the ash collecting box. If there is an internal repair problem, manual work is required under harsh working conditions. Summary of the invention
[0008] In view of the defects existing in the above prior art, the utility model proposes a header, a smoke metal expansion joint and a first motor, wherein the first motor is provided with a transmission rod, the smoke metal expansion joint comprises a telescopic part, and the two ends of the telescopic part are respectively connected with an upper flange and a lower flange, the upper flange is connected to the cracking gas inlet, the lower flange is connected to the docking port provided on the header, and the cracking gas inlet is communicated with the header gas through the upper flange.
[0009] The lower flange is also connected to the upper flange through a telescopic rod. The transmission rod rotates in a first direction to drive the telescopic rod to contract, so that the lower flange and the docking port are in a separated state, which is recorded as state 1.
[0010] Or the transmission rod rotates in the second direction, driving the telescopic rod to extend, so that the lower flange and the docking port are in state 2: airtight fit.
[0011] In some embodiments, the telescopic rod includes a screw rod, one end of which is rotatably connected to the upper flange, and the other end is threadedly engaged with a sleeve arranged on the lower flange. The screw rod is provided with a plurality of wing blades along the circumferential direction, and the transmission rod is meshed with a gear pattern arranged on the rotating drum. A plurality of paddle plates are arranged along the circumference inside the rotating drum. When the first motor is transmitting, it drives the rotating drum to rotate circumferentially. When the rotating drum rotates, the paddle plate contacts and pushes the wing blade, thereby rotating the screw rod, and the state of the lower flange and the docking interface is changed.
[0012] In some embodiments, after the lower flange and the docking port are transformed from state 1: separation to state 2: airtight fitting, the first motor is driven in reverse, and the contact state between the toggle plate and the wing plate changes to disengagement.
[0013] In some embodiments, after the lower flange and the docking port are transformed from state 2: airtight fitting to state 1: separation, the first motor drives in the reverse direction, and the contact state between the toggle plate and the wing plate changes to disengagement.
[0014] In some embodiments, the collection box includes a first ash box and a second ash box, the first ash box and the second ash box are rigidly connected, the second ash box is provided with a meshing rail, the meshing rail is meshed with a transmission shaft gear provided on a second motor, and the second motor drives the second collection box to move, thereby pushing the first collection box.
[0015] In some embodiments, a guide wheel is disposed at the lower portion of the header, the guide wheel runs in a concave track, the concave track is disposed on a supporting structure, and the supporting structure bears the weight of the header.
[0016] In some embodiments, the lower flange is provided with a sealing groove, the docking interface is embedded with a graphite sealing gasket, and the sealing groove and the graphite sealing gasket are tightly fitted in the state 2.
[0017] In some embodiments, a maintenance pipe is also provided at the connection section between the upper flange and the cracking gas inlet.
[0018] In some embodiments, the first motor and the second motor are connected to a DCS or a PLC.
[0019] Advantages of this utility model:
[0020] 1. The motor of the utility model structure does not directly contact the high-temperature part, the working environment of the motor is suitable, and the probability of damage in long-term use is low.
[0021] 2. The structure of the header of the utility model is simple, which conforms to the design concept in harsh working environment, reduces the complexity of equipment, greatly reduces the probability of mechanism failure, and is friendly to maintenance personnel.
[0022] 3. In some preferred embodiments, the redundant design of the utility model is designed with double headers, so that the cleaning work does not need to work at high temperature, and the maintenance work meets the disaster redundancy requirements.
[0023] 4. In some preferred embodiments, the utility model controls the first motor and the second motor through a logic controller or a distributed control system, so that personnel can operate the dust collecting box remotely, avoiding personnel working under harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1The overall structure diagram of the utility model is shown in FIG.
[0025] Figure 2 Shown as the utility model Figure 1 Enlarged view of point A
[0026] Figure 3 Schematic diagram of the connection structure of the screw rod, wing piece and sleeve of the utility model
[0027] Figure 4 The utility model is a schematic diagram of the meshing structure of the internal thread and the gear pattern.
[0028] Figure 5 Schematic diagram of the screw rod connection structure of the utility model
[0029] Figure 6 The utility model shows the detailed structure of the upper fixed disc, the lower fixed disc and the toggle disc.
[0030] Figure 7 Exploded diagram showing the connection structure between the rotating drum and the fixed shell of the utility model
[0031] Figure 8 A schematic diagram showing the first angle of the fixed shell of the utility model
[0032] Fig. 9 A second angle diagram of the fixed housing of the utility model is shown
[0033] Fig.10 The third angle diagram of the fixed shell of the utility model is shown
[0034] Fig.11 The first angle structure diagram of the rotary drum of the utility model is shown
[0035] Fig.12 The second angle structure diagram of the rotary drum of the utility model is shown
[0036] Fig.13 The third angle structure diagram of the rotary drum of the utility model is shown
[0037] Fig.14 The figure showing the contact and pushing of the toggle piece and the wing piece of the utility model
[0038] Fig.15 The utility model shows the separation diagram of the wave plate and the wing plate
[0039] Fig.16 The overall appearance of the second motor installation structure of the utility model is shown
[0040] Fig.17 Shown as the utility model Fig.16 Enlarged view of point B
[0041] Fig.18 A top view of the second motor installation structure of the utility model is shown
[0042] Fig.19 Schematic diagram showing the utility model of meshing rail embedded in the mounting plate
[0043] Fig. 20 The utility model shows the cross-sectional structure of the lower flange and the butt joint
[0044] Illustrations: 1. Collecting box; 11. First ash collecting box; 12. Second ash collecting box; 14. Guide wheel; 15. Ash discharge port; 16. Docking port; 161. Sealing gasket; 2. Support structure; 21. Concave rail; 22. Mounting plate; 221. Engaging rail; 2211. Moving rod; 222. Groove; 3. First motor; 31. Screw rod; 311. Wing; 32. Sleeve; 321. Internal thread; 34. Rotating cylinder; 341. Driving piece; 342. Gear pattern; 343, inner surface of the upper cylinder; 344, inner surface of the lower cylinder; 35, transmission rod; 4, second motor; 41, gear rod; 5, smoke metal expansion joint; 51, positioning rod; 52, telescopic part; 54, upper flange; 55, lower flange; 551, sealing groove; 6, fixed shell; 61, upper fixed disc; 62, lower fixed disc; 63, outer surface of the upper shell; 64, outer surface of the lower shell; 7, cracking gas inlet; 8, maintenance pipe; 9, telescopic rod DETAILED DESCRIPTION
[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0046] In the following description, spatial and directional terms such as "vertical" and "horizontal" may be used to describe the embodiments of the utility model, but it should be understood that these terms are only for the convenience of describing the embodiments shown in the figures, and do not require the actual device to be constructed or operated in a specific orientation. In the following description, the use of terms such as "connect", "couple", "fixed" and "attached" may refer to the direct connection between two elements or structures without other elements or structures, or may refer to the indirect connection between two elements or structures through an intermediate element or structure, unless otherwise explicitly stated in this document. The term "transmission connection" refers to the transmission of power and the relative movement caused by it between two or more elements or structures in a connection relationship.
[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0048] In the present invention, "PLC" refers to a programmable logic controller.
[0049] In the present invention, "DCS" refers to a distributed control system.
[0050] In the present invention, "smoke box" refers to either the front smoke box or the rear smoke box, or both.
[0051] In the present invention, the "end" in "one end" or "opposite end" refers to an end portion, and in the present invention refers to one or both axial ends of a cylindrical object such as a screw rod 31 or a sleeve 32.
[0052] The "state 1" of the present utility model can be interpreted as the lower flange and the docking port being in a separated state, and the "state 2" of the present utility model can be interpreted as the lower flange and the docking port being in an airtight fitting state.
[0053] See also Figure 1 and Figure 2 The utility model provides an acid cracking process waste heat exchanger smoke box ash discharge device, including a header 1, the header 1 is used to collect ash in the cracking gas, the header 1 is provided with a docking port 16 connected to the lower flange 55 of the smoke metal expansion joint 5, the smoke metal expansion joint 5 includes the lower flange 55, and also includes a telescopic part 52 connecting the lower flange 55 and the upper flange 54, the telescopic part 52 is a metal structure, which can be telescopic under the action of force, the upper flange 54 is connected to the smoke box flange, the smoke box flange is equivalent to the cracking gas inlet 7 of the device of the utility model, and the front / rear smoke box and the header 1 are connected by the smoke metal expansion joint 5. The smoke metal expansion joint 5 in the utility model also includes a positioning rod 51, the upper and lower flanges 55 have holes, the positioning rod 51 slides through the hole, and the end of the positioning rod 51 has a limiting nut, the upper and lower flanges 55 move in the axial direction of the positioning rod 51, and are blocked by the limiting nut, so that the upper and lower flanges 55 will not be separated from the positioning rod 51.
[0054] The upper flange 54 and the lower flange 55 are also respectively provided with extensions, which are the upper flange 54 extension and the lower flange 55 extension. The upper flange 54 and the lower flange 55 extensions are connected by a telescopic rod 9. The telescopic rod 9 can make the upper and lower flanges 55 start to approach or move away under manual operation or driven by a motor. Since the upper flange 54 is fixedly connected to the cracking gas inlet 7, when the telescopic rod 9 acts, the lower flange 55 starts to rise or fall. When the lower flange 55 rises, the lower flange 55 and the docking port 16 arranged on the header 1 are separated, which is state 1: separation. When the lower flange 55 descends, the lower flange 55 contacts the docking port 16 arranged on the header 1, which is state 2: airtight fit. In the airtight fit state, the cracking gas inlet 7, the upper flange 54, the telescopic portion 52, the lower flange 55 and the header 1 are gas-connected.
[0055] See also Figures 2 to 7 The telescopic rod 9 includes a screw rod 31, one end of which is rotatably connected to the upper flange 54. The rotation can be achieved through the built-in bearing of the upper flange 54, or by simply opening a circular groove on the upper flange 54 that matches the axial cross-section of the screw rod 31. The other end of the screw rod 31 is threadedly fitted with a sleeve 32 arranged on the lower flange 55. The screw rod 31 is provided with a plurality of fins 311 along the circumferential direction. The first motor 3 is provided with a transmission rod 35, and a gear is provided on the transmission rod 35. The transmission rod 35 passes through the upper shell of the fixed shell 6 and can rotate relative to the fixed shell 6. The gear portion of the transmission rod 35 is installed in the fixed shell 6, and the gear portion of the transmission rod 35 is meshed with the gear pattern 342 of the rotating drum 34.
[0056] See also Figures 7 to 10 The rotating drum 34 includes an upper cylindrical inner surface 343 and a lower cylindrical inner surface 344. The fixed shell 6 is provided with an upper fixed disc 61 and a lower fixed disc 62. The upper fixed disc 61 has an upper circular shell outer surface 63, and the lower fixed disc 62 has a lower circular shell outer surface 64.
[0057] See also Figure 6 and Figures 11 to 15 The inner surface 343 of the upper cylinder and the inner surface 344 of the lower cylinder are respectively fitted with the outer surface 63 of the upper circular shell and the outer surface 64 of the lower circular shell. The rotating drum 34 is rotatably installed on the fixed shell 6 in this way. The fixed disc 61 and the lower fixed disc 62 on the fixed shell 6 are in a separated state. The separation area is marked as 65. The paddle piece 341 of the rotating drum 34 extends from the separation part 65 and can contact and push the wing 311 when the rotating drum 34 rotates.
[0058] When the first motor 3 is working, it drives the transmission rod 35 to rotate in the first direction. The transmission rod 35 drives the rotating drum 34 through gear meshing. The rotating drum 34 rotates, and the toggle piece 341 contacts the wing 311 and pushes the wing 311. After the wing 311 is pushed, the screw rod 31 rotates. Since the sleeve 32 is fixedly arranged on the lower flange 55, the screw rod 31 is threadedly engaged with the sleeve 32. After the screw rod 31 starts to rotate, the screw rod 31 starts to move axially relative to the sleeve, pushing the upper and lower flanges 55 to start to approach each other, and switching state 1: disengagement to state 2: airtight fit
[0059] Similarly, when the first motor 3 is working, it drives the transmission rod 35 to rotate in the second direction. The transmission rod 35 drives the rotating drum 34 through gear meshing. The rotating drum 34 rotates, and the shifting piece 341 contacts the wing 311 and pushes the wing 311. After the wing 311 is pushed, the screw rod 31 rotates. Since the sleeve 32 is fixedly arranged on the lower flange 55, the screw rod 31 is threadedly fitted with the sleeve 32. After the screw rod 31 starts to rotate, the screw rod 31 starts to move axially relative to the sleeve, pushing the upper and lower flanges 55 to start to move away, and converting state 2: airtight fit to state 1: disengagement.
[0060] The above "first direction rotation" can be counterclockwise rotation, and the relative "second direction rotation" is clockwise rotation. Of course, those skilled in the art can make equivalent substitutions. Under the condition that the structure and function remain unchanged, changing the "first direction rotation" to clockwise rotation and changing the "second direction rotation" to counterclockwise rotation should also fall within the scope of the technical solution of the present utility model.
[0061] See also Figure 7 In some cases, due to the high temperature of the cracking gas, the upper and lower flanges 55 in contact have a relatively high temperature, and the temperature can be conducted through fixed contact, especially metal contact. In order to prevent the cracking gas temperature from being conducted to the motor, which greatly increases the failure rate of the motor under long-term operation, the toggle piece 341 pushes the wing 311 to the setting, and switches the state 1 to the state 2 airtight contact, or the state 2 airtight contact to the state 1 disengagement, the first motor 3 reverses to disengage the toggle piece 341. As a poor conductor of heat, the thermal conductivity of air is much lower than that of metal. As a further method, a heat-insulating plate, such as glass fiber or asbestos board, can be provided on the surface of the toggle piece 341 or the wing 311.
[0062] See also Figures 16 to 19 ,in Fig.18The top view of the second motor connection of the utility model is shown. In the chemical industry, especially in harsh production environments, equipment should have at least two or more backup redundancies. In the utility model, the collection box 1 is mounted on the supporting structure 2, and the supporting structure 2 is provided with a recessed rail 21. The collection box 1 can be set to two, divided into a first ash collection box 11 and a second ash collection box 12. The first ash collection box 11 and the second ash collection box 12 are provided with guide wheels 14 at the bottom, and the guide wheels 14 are arranged in the recessed rail 21. The first ash collection box 11 and the second ash collection box 12 are connected by a detachable rigid connection, such as a James hook. When the second ash collection box 12 is pushed, the first and second ash boxes can slide on the supporting structure 2.
[0063] The support structure 2 is also provided with a mounting plate 22, and a groove 222 is provided on the mounting plate 22. Fig.17 The meshing rail 221 shown is embedded and installed in the groove 222, and the meshing rail 221 can slide in the groove 222. A moving rod 2211 is also provided on the upper part of the meshing rail 221. When the second motor 4 is working and the gear rod 41 runs, the gear rod 41 meshes with the meshing rail 221, and the meshing rail 221 moves in the groove 222. The moving rod 2211 touches the end of the second ash collecting box 12, and the second ash collecting box 12 moves, driving the first ash collecting box 11 to move.
[0064] When the first ash box 11 reaches the predetermined capacity or an accident occurs, the second ash box 12 can be replaced to the position of the first ash box 11 in this way, and then the first motor 3 is used to make the second ash box 12 communicate with the smoke box gas. After the first ash box 11 is cooled, the ash is discharged from the ash outlet 15.
[0065] Similarly, in order to avoid the influence of high temperature on the electrode, after the moving rod 2211 moves the second ash collecting box 12 into place, the second motor 4 reverses, and the moving rod 2211 breaks contact with the second ash collecting box 12 to prevent high temperature from being transmitted to the second motor 4.
[0066] See also Figure 2 and Fig. 20 The header 1 is provided with a sealing gasket 161 at the interface 16, the lower flange 55 is provided with a sealing groove 551, the interface 16 is embedded with the sealing gasket 161, the sealing groove 551 and the sealing gasket 161 can fit tightly when the lower flange 55 and the interface 16 are in contact, and the utility model can adopt a metal-wrapped graphite sealing gasket or a similar high-temperature resistant sealing gasket.
[0067] See also Figure 1 A maintenance pipe 8 is also provided at the connection section between the upper flange 54 and the cracking gas inlet 7. The first motor 3 and the second motor 4 are connected to a DCS or a PLC for logic programming control to avoid the risks caused by on-site operation by personnel.
[0068] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
Claims
1. A smoke box ash removal device for a waste heat exchanger in an acid cracking process, comprising a header (1), a smoke metal expansion joint (5) and a first motor (3), characterized in that: The first motor (3) is provided with a transmission rod (35), the smoke metal expansion joint (5) comprises a telescopic part (52), the two ends of the telescopic part (52) are respectively connected to an upper flange (54) and a lower flange (55), the upper flange (54) is connected to a cracked gas inlet (7), the lower flange (55) is connected to a docking port (16) provided on the header (1), the cracked gas inlet (7) is in gas communication with the header (1) through the upper flange (54), The invention is characterized in that the lower flange (55) is also connected to the upper flange (54) through a telescopic rod (9), and when the transmission rod (35) drives the telescopic rod (9) to retract, the lower flange (55) and the docking port (16) are in a separated state; When the transmission rod (35) drives the telescopic rod (9) to extend, the lower flange (55) and the docking port (16) are in an airtight fitting state.
2. According to claim 1, the smoke box ash removal device of the acid cracking process waste heat exchanger is characterized in that: The telescopic rod (9) comprises a screw rod (31), one end of which is rotatably connected to the upper flange (54), and the other end of which is threadedly sleeved with a sleeve (32) arranged on the lower flange (55). The screw rod (31) is provided with a plurality of fins (311) along the circumferential direction. The transmission rod (35) is meshed with a gear pattern (342) arranged on the rotating drum (34). The rotating drum (34) is provided with a plurality of paddles (341) along the circumference. When the first motor (3) is in transmission, it drives the rotating drum (34) to rotate in a circle. When the rotating drum (34) rotates, the paddles (341) contact and push the fins (311), thereby rotating the screw rod (31), and the states of the lower flange (55) and the docking port (16) are switched.
3. According to claim 2, the smoke box ash removal device of the acid cracking process waste heat exchanger is characterized in that: After the lower flange (55) and the docking port (16) are converted from an airtight fitting state to a separated state, the first motor (3) is driven in the reverse direction, and the contact state between the shifting piece (341) and the wing (311) is changed to a disengaged state.
4. According to claim 3, the smoke box ash removal device of the acid cracking process waste heat exchanger is characterized in that: The collection box (1) comprises a first ash collection box (11) and a second ash collection box (12); the first ash collection box (11) and the second ash collection box (12) are rigidly connected; the second ash collection box (12) is provided with a meshing rail (221); the meshing rail (221) is meshed with a transmission shaft gear provided on a second motor (4); the second motor (4) drives the second ash collection box (12) to move, thereby pushing the first ash collection box (11).
5. According to claim 4, the smoke box ash removal device of the acid cracking process waste heat exchanger is characterized in that: A guide wheel (14) is arranged at the lower part of the header (1), and the guide wheel (14) runs in a concave track (21). The concave track (21) is arranged on a supporting structure (2), and the supporting structure (2) bears the weight of the header (1).
6. The smoke box ash removal device for the acid cracking process waste heat exchanger according to claim 5 is characterized in that: The lower flange (55) is provided with a sealing groove (551), and the docking port (16) is embedded with a sealing gasket (161). The sealing groove (551) and the sealing gasket (161) are tightly fitted in the state 2.
7. The smoke box ash removal device for the acid cracking process waste heat exchanger according to claim 6 is characterized in that: A maintenance pipe (8) is also provided at the connection section between the upper flange (54) and the cracked gas inlet (7).
8. The smoke box ash removal device for the acid cracking process waste heat exchanger according to claim 7 is characterized in that: The first motor (3) and the second motor (4) are connected to a DCS or a PLC.