A high-pressure fire-tube boiler

Abstract

The present application relates to a high-pressure fire-tube boiler, which comprises a water supply cavity, an extrusion component, a heat exchange tube, a driving component, a pushing roller, a descaling component, a descaling disc, a driving roller and a heat equalizing component. The water supply cavity is arranged in the boiler shell, the heat exchange tube is fixed in the boiler shell, the driving roller is arranged at the front side of the water supply cavity, the pushing roller is arranged at the rear end of the driving roller, the pushing roller is attached to the driving roller, and the descaling disc is slidingly connected to the heat exchange tube. The water supply cavity in the boiler shell is arranged as a conical cavity, which cooperates with the heat equalizing component to make the heat exchange of the high-pressure fire-tube boiler more uniform and improve the efficiency. The inner wall of the water supply cavity cooperates with the driving component, the extrusion component and the descaling component to slowly and carefully clean the heat exchange tube at the place where scaling is more likely to occur and quickly clean the heat exchange tube with less scaling, so as to realize automatic cleaning and improve the cleaning efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery systems for sulfuric acid plants, specifically a high-pressure fire-tube boiler. Background Technology

[0002] In sulfuric acid production waste heat recovery devices, the waste heat generated by sulfur combustion is generally exchanged with water in the boiler through fire tubes and recovered in the form of medium-pressure steam or sub-high-pressure steam for power generation or heating. In sulfuric acid production devices equipped with generator sets, high-pressure and high-temperature steam is used for power generation, which can maximize the economic benefits of waste heat recovery. However, in existing high-pressure fire-tube boilers, due to the large boiler size and long heat exchange tubes, the temperature of the heat exchange tubes near the flue gas inlet is much higher than that of the heat exchange tubes further away from the flue gas inlet after heat exchange with water. This results in different heat exchange efficiencies at the two ends of the boiler. Furthermore, since the rate of scale condensation is related to temperature and water evaporation, the heat exchange tubes closer to the flue gas inlet are more prone to scale buildup. This difference in scale condensation before and after the heat exchange tubes necessitates different cleaning times and intensities. Over-cleaning shortens the lifespan of the heat exchange tubes, while incomplete cleaning leaves scale residue, reducing the boiler's heat exchange efficiency. Therefore, the temperature difference before and after the heat exchange tubes further increases the difficulty of scale cleaning and raises boiler maintenance costs.

[0003] Therefore, a high-pressure fire-tube boiler is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure fire-tube boiler. In view of the problems in the prior art, the large temperature difference before and after the heat exchange tube leads to uneven heat exchange efficiency, which also makes scale cleaning difficult and increases boiler maintenance costs.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-pressure fire-tube boiler includes a flue gas inlet, a boiler shell, and an exhaust pipe. The boiler shell is connected to the right end of the flue gas inlet, and the exhaust pipe is connected to the right end of the boiler shell. It also includes a water supply chamber, heat exchange tubes, a drive roller, a push roller, a descaling disc, a heat equalization component, a drive component, a pressing component, and a descaling component. The water supply chamber is located inside the boiler shell and is a conical cavity. The heat exchange tubes are fixed inside the boiler shell. The drive roller is located in front of the water supply chamber and is a conical roller. The push roller is located at the rear end of the drive roller and is in contact with the drive roller. The descaling disc is slidably connected to the heat exchange tube. The heat equalization component is located at the bottom of the boiler shell and is used to cooperate with the water supply cavity to improve the heat exchange efficiency of the heat exchange tube. The driving component is located at the rear end of the driving roller. When the driving roller rotates, it can maintain contact with the pushing roller by cooperating with the inner wall of the water supply cavity and drive the descaling disc to move. The squeezing component is located on the left side of the descaling disc. When the descaling disc moves to the left relative to the pushing roller, it stops the pushing roller from pushing the descaling disc. The descaling component is located at the left end of the descaling disc. When the descaling disc stops moving, it performs chemical cleaning of the scale on the heat exchange tube.

[0007] Preferably, the heat equalization component includes a water inlet pipe and a water outlet pipe. The water inlet pipe is located at the lower end of the pot shell, and there are multiple water inlet pipes. The distance between the multiple water inlet pipes increases sequentially from left to right. The water outlet pipe is located at the upper end of the pot shell, and there are multiple water outlet pipes. Each water outlet pipe is located above the corresponding water inlet pipe position on the pot shell.

[0008] Preferably, the inner diameter of the left end of the water replenishment chamber is larger than the inner diameter of the right end, the lower end of the water replenishment chamber is connected to the water inlet pipe, and the upper end of the water replenishment chamber is connected to the water outlet pipe.

[0009] Preferably, the driving component includes a lifting groove, a lifting block, a lifting screw, a driving protrusion, a driving disc, and a bonding unit. The lifting groove is formed on the left and right sides of the pot shell. There are two lifting blocks, each of which is slidably connected to the corresponding lifting groove. The left and right ends of the lifting screw are fixedly connected to the corresponding lifting blocks. The driving protrusion is disposed in the pushing roller and cooperates with the lifting screw. The driving disc is slidably connected to the heat exchange tube and is bonded to the pushing roller. The bonding unit is disposed in the driving disc.

[0010] Preferably, the bonding unit includes a bonding groove, a bonding block, a bonding rack, a bonding gear, an abutting rack, and an abutting spring. The bonding groove is formed inside the drive disk, the bonding block is slidably connected inside the bonding groove, the lifting screw passes through the left and right ends of the bonding block, the bonding rack is fixedly connected to the rear end of the bonding block, the bonding gear is rotatably connected inside the bonding groove, the upper end of the bonding gear meshes with the lower end of the bonding rack, the abutting rack is disposed at the lower end of the bonding gear and meshes with the bonding rack, the abutting spring is disposed at the front end of the abutting rack, the two ends of the abutting spring are respectively connected to the front end of the abutting rack and the inner wall of the drive disk, and the rear end of the abutting rack is bonded to the inner wall of the water replenishment chamber.

[0011] Preferably, a rolling wheel is rotatably connected to the rear end of the abutting rack, and the rolling wheel is rotatably connected to the water replenishment chamber.

[0012] Preferably, the extrusion component includes a reaction tank, an extrusion groove, an extrusion block, an extrusion spring, an extrusion column, and an unlocking unit. The reaction tank is located at the right end of the drive disc. The descaling disc is slidably connected to the reaction tank. A descaling push block is provided at the left end of the descaling disc. The extrusion groove is located at the right end of the bonding block. The extrusion block is connected to the extrusion groove. The extrusion column is fixedly connected to the left end of the extrusion block. The extrusion column and the extrusion block are connected through each other. The right end of the extrusion block cooperates with the descaling push block. Both ends of the extrusion spring are connected to the left end of the extrusion block and the bonding block, respectively. The unlocking unit is located inside the drive roller.

[0013] Preferably, the unlocking unit includes an unlocking groove, an unlocking ring, an unlocking block, an unlocking spring, an unlocking chamfer, a shrinking baffle, a shrinking groove, a shrinking spring, and a shrinking block. The unlocking groove is located at the right end of the push roller. The unlocking ring is slidably connected within the unlocking groove, and the right end of the unlocking ring engages with the extrusion column. The unlocking block is located at the left end of the unlocking ring. The unlocking chamfer is located on the left side of the unlocking block. Both ends of the unlocking spring are connected to the left end of the unlocking ring and the inner wall of the push roller, respectively. The shrinking groove is located on the left side of the unlocking groove. The shrinking block is slidably connected within the shrinking groove. The shrinking baffle is located at the right end of the shrinking block, and the right end of the shrinking baffle engages with the unlocking chamfer. Both ends of the shrinking spring are connected to the end of the shrinking block away from the lifting screw and the inner wall of the push roller, respectively. The end of the shrinking block near the lifting screw is fixedly connected to the drive protrusion.

[0014] Preferably, the descaling component includes a cleaning agent and descaling holes. The descaling holes are formed on the descaling plate, and there are multiple descaling holes. Each descaling hole is located in a heat exchange tube, and the cleaning agent is disposed in the reaction tank.

[0015] Preferably, a settling port is provided at the lower left end of the water replenishment chamber, and the settling port is connected to the outside of the pot shell.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] This invention designs the water replenishment chamber inside the boiler shell as a conical cavity, which, in conjunction with a heat equalization component, allows the heat exchange tubes closer to the flue gas inlet to heat more water, resulting in more uniform heat exchange and improved efficiency in the high-pressure fire-tube boiler. By installing a descaling disc on the outside of the heat exchange tubes and conical pushing and driving rollers inside the water replenishment chamber, along with a driving component, a squeezing component, and a descaling component, the descaling disc can slowly and carefully clean the heat exchange tubes with relatively high temperatures and a greater tendency to scale, while quickly cleaning the heat exchange tubes with relatively low temperatures and less scale. This allows for automatic scale removal while improving the efficiency of scale removal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0020] Figure 3 This is a frontal view of the structure of the present invention;

[0021] Figure 4 This is a cross-sectional structural diagram of the drive component of the present invention;

[0022] Figure 5 For the present invention Figure 5 Enlarged structural diagram at point D;

[0023] Figure 6 This is a schematic cross-sectional view of the bonding unit of the present invention;

[0024] Figure 7 This is a schematic cross-sectional view of the extrusion component of the present invention;

[0025] Figure 8 For the present invention Figure 7 Enlarged structural diagram at point E;

[0026] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point F;

[0027] Figure 10 This is a cross-sectional structural diagram of the descaling component of the present invention.

[0028] In the diagram: a) Flue gas inlet; b) Boiler shell; c) Exhaust pipe; 1) Water supply chamber; 2) Extrusion component; 3) Heat exchange tube; 4) Drive component; 5) Push roller; 6) Descaling component; 7) Descaling disc; 8) Drive roller; 9) Heat equalization component; 91) Water inlet pipe; 92) Water outlet pipe; 41) Lifting groove; 42) Lifting block; 43) Lifting screw; 44) Drive disc; 45) Bonding unit; 46) Drive protrusion; 451) Bonding block; 452) Bonding groove; 453) Bonding rack; 454) Bonding gear; 4 55. Abutting rack; 456. Abutting spring; 4551. Rolling wheel; 21. Reaction tank; 22. Extrusion tank; 23. Extrusion block; 24. Extrusion spring; 25. Extrusion column; 26. Unlocking unit; 71. Descaling push block; 261. Unlocking groove; 262. Unlocking ring; 263. Unlocking spring; 264. Unlocking block; 265. Unlocking chamfer; 266. Shrinkage baffle; 267. Shrinkage spring; 268. Shrinkage block; 269. Shrinkage groove; 61. Cleaning agent; 62. Descaling hole; 11. Settling port. Detailed Implementation

[0029] To ensure a clear and complete description of the technical solutions in the embodiments of the present invention, and to make the features and advantages more apparent and understandable, the specific implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Example 1

[0030] Please see Figures 1 to 3This invention provides a high-pressure fire-tube boiler, including a flue gas inlet a, a boiler shell b, and an exhaust pipe c. Two boiler shells b are connected to the right end of the flue gas inlet a, and the exhaust pipe c is connected to the right ends of the two boiler shells b. Each boiler shell b includes a water supply chamber 1, a heat exchange tube 3, a drive roller 8, a pushing roller 5, a descaling disc 7, a heat equalization component 9, a drive component 4, a squeezing component 2, and a descaling component 6. The water supply chamber 1 is located inside the boiler shell b and is a conical cavity. The heat exchange tube 3 is fixed inside the boiler shell b. The drive roller 8 is located in front of the water supply chamber 1 and is a conical roller. The pushing roller 5 is located at the rear end of the drive roller 8. The descaling disc 7 is slidably connected to the heat exchange tube 3 and is in contact with the drive roller 8. The heat equalization component 9 is located at the bottom of the boiler shell b and is used to cooperate with the water supply chamber 1 to improve the heat exchange efficiency of the heat exchange tube 3. The drive component 4 is located at the rear end of the drive roller 8 and can be in contact with the push roller 5 by cooperating with the inner wall of the water supply chamber 1 when the drive roller 8 rotates, and drive the descaling disc 7 to move. The squeezing component 2 is located on the right side of the descaling disc 7 and stops the push roller 5 from pushing the descaling disc 7 when the descaling disc 7 moves to the left relative to the push roller 5. The descaling component 6 is located at the left end of the descaling disc 7 and performs chemical cleaning of the scale on the heat exchange tube 3 when the descaling disc 7 stops moving.

[0031] Please see Figures 2 to 3 Specifically, the heat equalization component 9 includes a water inlet pipe 91 and a water outlet pipe 92. The water inlet pipe 91 is located at the lower end of the pot shell b. There are multiple water inlet pipes 91, and the distance between the multiple water inlet pipes 91 increases sequentially from left to right. The water outlet pipe 92 is located at the upper end of the pot shell b. There are multiple water outlet pipes 92, and each water outlet pipe 92 is located above the position of the corresponding water inlet pipe 91 on the pot shell b. The inner diameter of the left end of the water replenishment chamber 1 is larger than the inner diameter of the right end. There are two sets of water inlet pipes 91 at the front and back of the leftmost end, which are connected to the lower end of the pot shell b.

[0032] Working principle: In response to the large temperature difference in heat exchange and high steam output of boiler shell b, the diameter of the water supply chamber 1 in the boiler on the side closer to the flue gas inlet a is enlarged, so that the inner diameter of the left end of the water supply chamber 1 is larger than that of the right end. This ensures that the left end of the water supply chamber 1 in boiler shell b can hold more water than the right end. This allows the heat exchange tube 3 on the side of boiler shell b that has a higher temperature due to its proximity to the flue gas inlet a to exchange heat with more water, thereby making the heat exchange of the fire-tube boiler more uniform and improving the heat exchange efficiency. At the same time, by increasing the distance between the water inlet pipes 91 from left to right, and by setting two water inlet pipes 91 at the front and back of the leftmost water inlet pipe 91 that enter the water supply chamber 1 from the lower end of boiler shell b, it is ensured that the water in the water supply chamber 1 can be replenished evenly. Example 2

[0033] Please see Figures 2 to 6This invention provides a high-pressure fire-tube boiler, including a drive component 4. The inner wall radius of the water supply chamber 1 decreases from left to right, the outer diameter of the drive roller 8 increases from left to right, and the outer diameter of the push roller 5 decreases from left to right. The increase and decrease rates of the inner diameter of the water supply chamber 1, the outer diameter of the drive roller 8, and the outer diameter of the push roller 5 are the same. The drive roller 8 is driven to rotate by a motor (not shown in the figure), which can be installed and fixed inside the boiler shell b. The motor is used to drive the drive roller 8 to rotate forward or backward. The drive roller 8 is a conical roller, with the side of the drive roller 8 with a smaller radius facing left and close to the flue gas inlet end a. Its front end is in contact with the front end of the water supply chamber 1, and its rear end is parallel to the rear end of the water supply chamber 1. The push roller 5 meshes with the drive roller 8. When the drive roller 8 rotates, it can drive the push roller 5 to rotate under the action of friction. The push roller 5 can also slide left and right along the side of the drive roller 8 according to the direction of the force. The working principle of the left and right sliding method and the synchronous rotation method is similar to the steel belt and drive disc of a continuously variable transmission (CVT) in an automobile. The driving component 4 includes a lifting groove 41, a lifting block 42, a lifting screw 43, a driving protrusion 46, a driving disc 44, and a bonding unit 45. The lifting groove 41 is located on the left and right sides of the pot shell b. There are two lifting blocks 42, which are slidably connected to the corresponding lifting groove 41. The left and right ends of the lifting screw 43 are fixedly connected to the corresponding lifting blocks 42. The side of the lifting screw 43 is provided with a threaded groove. The driving protrusion 46 is located in the push roller 5. The driving protrusion 46 cooperates with the lifting screw 43. The cooperation here means that when the driving protrusion 46 is inserted into the threaded groove on the lifting screw 43, when the push roller 5 rotates and drives the driving protrusion 46 to rotate, the driving protrusion 46 can drive the push roller 5 to move left and right along the direction of the threaded groove of the lifting screw 43. The driving disc 44 is slidably connected to the heat exchange tube 3 and is bonded to the push roller 5. The bonding unit 45 is located in the driving disc 44.

[0034] Please see Figures 4 to 6 Specifically, the bonding unit 45 includes a bonding groove 452, a bonding block 451, a bonding rack 453, a bonding gear 454, an abutting rack 455, and an abutting spring 456. The bonding groove 452 is formed inside the drive disk 44, the bonding block 451 is slidably connected to the bonding groove 452, the lifting screw 43 passes through the left and right ends of the bonding block 451, the bonding rack 453 is fixedly connected to the rear end of the bonding block 451, and the bonding gear 454 rotates... The dynamic connection is in the fitting groove 452. The lower end of the fitting gear 454 meshes with the upper end of the fitting rack 453. The abutting rack 455 is set on the upper end of the fitting gear 454 and meshes with the fitting rack 453. The abutting spring 456 is set on the front end of the abutting rack 455. The two ends of the abutting spring 456 are respectively connected to the front end of the abutting rack 455 and the inner wall of the drive disk 44. The rear end of the abutting rack 455 is fitted with the inner wall of the water replenishment chamber 1.

[0035] Please see Figure 6Specifically, a rolling wheel 4551 is rotatably connected to the rear end of the abutting rack 455. The rolling wheel 4551 is rotatably connected to the water replenishment cavity 1. The function of the rolling wheel 4551 is to change the sliding friction between the abutting rack 455 and the water replenishment cavity 1 into rolling friction, thereby reducing the friction force.

[0036] Specifically, a gas flow sensor (not shown in the figure) can be installed inside the water outlet pipe 92 to detect the heat exchange efficiency of the heat exchange tube 3 inside the boiler shell b. When the gas flow sensor detects that the flow rate of high-temperature steam flowing through the water outlet pipe 92 decreases over a period of time, the gas flow sensor transmits a signal to start the motor and drive the drive roller 8 to rotate, thereby descaling and cleaning the heat exchange tube 3.

[0037] The rest of the structure is the same as in Example 1.

[0038] Working principle: In the initial position, the push roller 5 is located at the lower left end of the drive roller 8, and the drive disc 44 is located at the right end of the push roller 5 and is in contact with the right end of the push roller 5. After long-term use, when the heat exchange tube 3 of the high-pressure fire-tube boiler becomes scaled, affecting the heat exchange efficiency, the motor rotates, driving the drive roller 8 to rotate forward, which in turn drives the push roller 5 to rotate. Under the cooperation of the drive protrusion 46 and the threaded groove of the lifting screw 43, the push roller 5 moves to the right, pushing the drive disc 44 to the right. The drive disc 44 moves to the right, driving the descaling disc 7 to the right to mechanically clean the scale on the heat exchange tube 3. During this process, the abutting rack 455 inside the drive disc 44 extends out of the drive disc 44 under the action of the abutting spring 456, and the rolling wheel 4551... The push roller 5 remains in contact with the inner wall of the water supply chamber 1. When the push roller 5 drives the drive disc 44 to move to the right, since the inner diameter of the water supply chamber 1 decreases from left to right, when the abutting rack 455 moves to the right, it will continuously move forward along with the inner wall of the water supply chamber 1, squeezing the abutting spring 456. When the abutting rack 455 moves forward, it drives the contact gear 454 to rotate. The rotation of the contact gear 454 drives the contact rack 453 to move backward, so that the push roller 5 can remain in contact with the drive roller 8 during the movement to the right. This allows the drive roller 8 to continuously drive the push roller 5 to rotate, enabling the descaling disc 7 to move to the right to mechanically clean the scale on the heat exchange tube 3. This achieves automation and makes the descaling of the heat exchange tube 3 simple and convenient.

[0039] Simultaneously, when the drive roller 8 drives the push roller 5 to rotate, causing the drive disc 44 and descaling disc 7 to move to the right to mechanically clean the heat exchange tube 3, the heat exchange tube 3 near the flue gas inlet a has a higher temperature and a larger cavity, resulting in a larger amount of water being converted into steam. Therefore, compared to the heat exchange tube 3 on the right side, the heat exchange tube 3 on the left side is more prone to scaling, requiring greater driving force and more time to drive the descaling disc 7 to clean the heat exchange tube 3 on the left side. Therefore, this invention increases the outer diameter of the drive roller 8 from left to right, pushing... The outer diameter of roller 5 decreases from left to right. On the one hand, this allows the drive roller 8 to fit better with the water replenishment chamber 1 and make better use of the space inside the boiler shell b. On the other hand, as the descaling disc 7 moves to the right, the torque of the drive roller 8 on the push roller 5 decreases, causing the push roller 5 to rotate faster and faster. This results in the descaling disc 7 cleaning the heat exchange tube 3 on the left side where there is more scale and cleaning the heat exchange tube 3 on the right side where there is less scale. This rationally distributes the cleaning efficiency while reducing damage to the heat exchange tube 3 caused by excessive mechanical cleaning.

[0040] After cleaning, the motor drives the drive roller 8 to reverse. At this time, the abutment spring 456 in the drive disc 44 returns to its original position, applying a backward force to the abutment rack 455, so that the abutment rack 455 can move to the left along the inner wall of the water replenishment chamber 1, thereby driving the drive disc 44 and the descaling disc 7 to move to the left. The leftward movement of the drive disc 44 pushes the push roller 5 to move to the left, and at the same time, the push roller 5 and the drive roller 8 come into contact. Under the drive of the drive roller 8, the push roller 5 and the drive disc 44 move to the left and return to their original positions. Finally, the push roller 5, the drive disc 44 and other components return to the left side of the heat exchange tube 3, which is convenient for the next cleaning, achieves higher automation, and reduces the cost of scale cleaning. Example 3

[0041] Please see Figures 7 to 10A high-pressure fire-tube boiler is provided, including an extrusion component 2. The extrusion component 2 includes a reaction tank 21, an extrusion groove 22, an extrusion block 23, an extrusion spring 24, an extrusion column 25, and an unlocking unit 26. The reaction tank 21 is located at the right end of the drive disc 44. A descaling disc 7 is slidably connected to the reaction tank 21. A descaling pusher 71 is provided at the left end of the descaling disc 7. The extrusion groove 22 is located at the right end of the fitting block 451. The extrusion block 23 is connected inside the extrusion groove 22. The extrusion column 25 is fixedly connected to the left end of the extrusion block 23. The extrusion column 25 and the extrusion block 23 are connected through each other. The descaling pusher 71 is engaged with the descaling pusher 71. This engagement means that when the descaling disc 7 is cleaning the heat exchange tube 3, if it encounters too much scale buildup on the heat exchange tube 3 and cannot continue to move, the pusher roller 5 continues to move to the right to push the drive disc 44. At this time, the descaling disc 7 moves to the left relative to the drive disc 44, and the descaling pusher 71 at the left end of the descaling disc 7 is in contact with the extrusion block 23, causing the extrusion block 23 to move to the left relative to the drive disc 44 to compress the extrusion spring 24. The two ends of the extrusion spring 24 are respectively connected to the left end of the extrusion block 23 and the contact block 451. The unlocking unit 26 is set inside the pusher roller 5.

[0042] Please see Figures 8 to 9 Specifically, the unlocking unit 26 includes an unlocking groove 261, an unlocking ring 262, an unlocking block 264, an unlocking spring 263, an unlocking chamfer 265, a shrinking baffle 266, a shrinking groove 269, a shrinking spring 267, and a shrinking block 268. The unlocking groove 261 is located at the right end of the push roller 5. The unlocking ring 262 is slidably connected within the unlocking groove 261. The right end of the unlocking ring 262 engages with the extrusion column 25. This engagement means that when the extrusion block 23 moves to the left relative to the drive disk 44, the extrusion block 23 drives the extrusion column 25 to approach the unlocking ring 262. As the extrusion block 23 continues to move to the left relative to the drive disk 44, the extrusion column 25 gradually comes into contact with the right end of the unlocking ring 262, pushing the unlocking ring 262 to move to the left relative to the push roller 5 and extruding the unlocking spring 263. The unlocking block 264 is located at the left end of the unlocking ring 262, and the unlocking chamfer 265 is located on the unlocking block 268. On the left side, the two ends of the unlocking spring 263 are connected to the left end of the unlocking ring 262 and the inner wall of the push roller 5, respectively. The shrinkage groove 269 is opened on the left side of the unlocking groove 261. The shrinkage block 268 is slidably connected in the shrinkage groove 269. The shrinkage baffle 266 is set at the right end of the shrinkage block 268. The right end of the shrinkage baffle 266 cooperates with the unlocking chamfer 265. The cooperation here means that when the unlocking ring 262 moves to the left relative to the push roller 5, the unlocking ring 262 drives the unlocking chamfer 265 to move to the left relative to the push roller 5. The unlocking chamfer 265 gradually fits against the right end of the shrinkage baffle 266, and the shrinkage baffle 266 gradually moves away from the lifting screw 43 along the unlocking chamfer 265. The two ends of the shrinkage spring 267 are connected to the end of the shrinkage block 268 away from the lifting screw 43 and the inner wall of the push roller 5, respectively. The end of the shrinkage block 268 near the lifting screw 43 is fixedly connected to the drive protrusion 46.

[0043] Please see Figure 10 Specifically, the descaling component 6 includes a cleaning agent 61 and descaling holes 62. Multiple descaling holes 62 are located on the descaling plate 7, each corresponding to the heat exchange tube 3. The diameter of the descaling hole 62 is slightly larger than the outer diameter of the heat exchange tube 3, allowing the descaling plate 7 to scrape away scale from the heat exchange tube 3 while simultaneously facilitating the reaction of the cleaning agent 61 in the reaction tank 21 with the scale, thus softening it. The cleaning agent 61 is a composite cleaning agent and is placed inside the reaction tank 21. It is a mixture of various acidic substances and corrosion inhibitors, which can effectively remove scale and reduce corrosion of boiler metal parts during the cleaning process. A settling port 11 is provided at the lower left end of the water supply chamber 1, so that the scale that is cleaned can settle naturally when the high-pressure fire tube boiler is not working, and slide along the water supply chamber 1 to the settling port 11, making it convenient for the operator to clean the scale from the settling port 11. The settling port 11 is connected to the outside of the boiler shell b. The settling port 11 can be closed with a removable baffle when the high-pressure fire tube boiler is working.

[0044] The rest of the structure is the same as in Example 2.

[0045] Working Principle: When cleaning scale on heat exchanger tube 3, push roller 5 pushes drive disc 44 and descaling disc 7 to the right. When descaling disc 7 encounters a thick layer of scale and cannot continue to move to the right, push roller 5 continues to move to the right, pushing drive disc 44, causing descaling disc 7 to move to the left relative to drive disc 44. The descaling push block 71 at the left end of descaling disc 7 comes into contact with extrusion block 23, causing extrusion block 23 to move to the left relative to drive disc 44 and compress extrusion spring 24. When extrusion block 23 moves to the left relative to drive disc 44, extrusion block 23 drives extrusion column 25 to approach unlocking ring 262. As extrusion block 23 continues to move to the left relative to drive disc 44, extrusion column 25 gradually comes into contact with the right end of unlocking ring 262, pushing unlocking ring 262 to move to the left relative to push roller 5 and compress unlocking spring 263. When unlocking ring 262 moves to the left relative to push roller 5, unlocking ring 262 drives unlocking chamfer 265 to move to the left relative to push roller 5, unlocking... The locking chamfer 265 gradually comes into contact with the right end of the retraction baffle 266, causing the retraction baffle 266 to gradually move away from the lifting screw 43 along the unlocking chamfer 265. The retraction baffle 266 drives the retraction block 268 and the drive protrusion 46 to move away from the lifting screw 43, eventually causing the drive protrusion 46 to be pulled out of the thread groove of the lifting screw 43, causing the drive protrusion 46 in the push roller 5 to lose its engagement with the lifting screw 43. At this time, the drive disc 44 compresses the spring 24. Under the push, the spring returns to its original position, causing the abutting rack 455 to slide to the left along the inner wall of the water replenishment chamber 1. The straight contraction baffle 266 disengages from the unlocking chamfer 265, and the driving protrusion 46 re-inserts into the threaded groove of the lifting screw 43. Then, the driving disc 44 moves to the right again under the action of the pushing roller 5, the driving roller 8, and the lifting screw 43. This process is repeated several times until the scale on the right side of the descaling disc 7 is softened by the descaling component 6, and the descaling disc 7 can continue to move to the right.

[0046] When the descaling disc 7 stops moving after encountering scale that is difficult to remove mechanically, the drive disc 44 repeatedly moves left and right relative to the descaling disc 7. As a result, the volume of the reaction tank 21 inside the drive disc 44 changes continuously, causing the cleaning agent 61 in the reaction tank 21 and the water in the water replenishment chamber 1 to continuously flow in and out of the descaling hole 62 for mixing. This chemically softens the scale on the right side of the descaling hole 62. After softening to a certain extent, the descaling disc 7 can continue to move to the right for cleaning, thus combining mechanical and chemical cleaning. This saves on chemical cleaning costs while ensuring the cleaning effect of the scale on the heat exchange tube 3 and preventing the heat exchange tube 3 from becoming less durable due to violent cleaning or chemical corrosion.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A high-pressure fire-tube boiler, comprising a flue gas inlet (a), a boiler shell (b), and an exhaust pipe (c), wherein the boiler shell (b) is connected to the right end of the flue gas inlet (a), and the exhaust pipe (c) is connected to the right end of the boiler shell (b), characterized in that: The system includes a water supply chamber (1), an extrusion component (2), a heat exchange tube (3), a drive component (4), a push roller (5), a descaling component (6), a descaling disc (7), a drive roller (8), and a heat equalization component (9). The water supply chamber (1) is located inside the boiler shell (b) and is a conical cavity. The inner diameter of the left end of the water supply chamber (1) is larger than the inner diameter of the right end. The heat exchange tube (3) is fixed inside the boiler shell (b). The drive roller (8) is located in front of the water supply chamber (1), and the push roller (5) is located at the rear end of the drive roller (8). The push roller (5) is in contact with the drive roller (8). The descaling disc (7) is slidably connected to the heat exchange tube (3). The heat equalization component... (9) Set at the bottom of the pot shell (b), it is used to cooperate with the water supply cavity (1) to improve the heat exchange efficiency of the heat exchange tube (3). The driving component (4) is set at the rear end of the driving roller (8). When the driving roller (8) rotates, it can be kept in contact with the pushing roller (5) with the cooperation of the inner wall of the water supply cavity (1) and drive the descaling plate (7) to move. The squeezing component (2) is set on the left side of the descaling plate (7). When the descaling plate (7) moves to the left relative to the pushing roller (5), it stops the pushing roller (5) from pushing the descaling plate (7). The descaling component (6) is set at the left end of the descaling plate (7). When the descaling plate (7) stops moving, it performs chemical cleaning on the scale on the heat exchange tube (3). The driving component (4) includes a lifting groove (41), a lifting block (42), a lifting screw (43), a driving disk (44), a bonding unit (45), and a driving protrusion (46). The lifting groove (41) is opened on the left and right sides of the pot shell (b). There are two lifting blocks (42), and the two lifting blocks (42) are slidably connected in the corresponding lifting groove (41). The left and right ends of the lifting screw (43) are fixedly connected to the corresponding lifting blocks (42). The driving protrusion (46) is set in the push roller (5). The driving protrusion (46) cooperates with the lifting screw (43). The driving disk (44) is slidably connected to the heat exchange tube (3). The driving disk (44) is bonded to the push roller (5). The bonding unit (45) is set in the driving disk (44). The bonding unit (45) includes a bonding block (451), a bonding groove (452), a bonding rack (453), a bonding gear (454), an abutting rack (455), and an abutting spring (456). The bonding groove (452) is formed inside the drive disk (44). The bonding block (451) is slidably connected inside the bonding groove (452). The lifting screw (43) passes through the left and right ends of the bonding block (451). The bonding rack (453) is fixedly connected to the rear end of the bonding block (451). The bonding gear (454) rotates. Connected in the fitting groove (452), the lower end of the fitting gear (454) meshes with the upper end of the fitting rack (453), the abutting rack (455) is disposed on the upper end of the fitting gear (454), the abutting rack (455) meshes with the fitting rack (453), the abutting spring (456) is disposed at the front end of the abutting rack (455), the two ends of the abutting spring (456) are respectively connected to the front end of the abutting rack (455) and the inner wall of the drive disk (44), and the rear end of the abutting rack (455) is fitted with the inner wall of the water replenishment chamber (1); The extrusion component (2) includes a reaction tank (21), an extrusion tank (22), an extrusion block (23), an extrusion spring (24), an extrusion column (25), and an unlocking unit (26). The reaction tank (21) is located at the right end of the drive disc (44). The descaling disc (7) is slidably connected to the reaction tank (21). A descaling pusher (71) is provided at the left end of the descaling disc (7). The extrusion tank (22) is located at the right end of the bonding block (451). The extrusion block (23) is connected inside the extrusion tank (22). The extrusion column (25) is fixedly connected to the left end of the extrusion block (23). The extrusion column (25) and the extrusion block (23) are connected through each other. The right end of the extrusion block (23) cooperates with the descaling pusher (71). The two ends of the extrusion spring (24) are respectively connected to the left end of the extrusion block (23) and the bonding block (451). The unlocking unit (26) is located inside the push roller (5). The unlocking unit (26) includes an unlocking groove (261), an unlocking ring (262), an unlocking spring (263), an unlocking block (264), an unlocking chamfer (265), a shrinking baffle (266), a shrinking spring (267), a shrinking block (268), and a shrinking groove (269). The unlocking groove (261) is located at the right end of the push roller (5). The unlocking ring (262) is slidably connected within the unlocking groove (261). The right end of the unlocking ring (262) engages with the extrusion column (25). The unlocking block (264) is located at the left end of the unlocking ring (262). The unlocking chamfer (265) is located on the left side of the unlocking block (264). The two ends of the locking spring (263) are respectively connected to the left end of the unlocking ring (262) and the inner wall of the push roller (5). The shrinkage groove (269) is opened on the left side of the unlocking groove (261). The shrinkage block (268) is slidably connected in the shrinkage groove (269). The shrinkage baffle (266) is set at the right end of the shrinkage block (268). The right end of the shrinkage baffle (266) cooperates with the unlocking chamfer (265). The two ends of the shrinkage spring (267) are respectively connected to the end of the shrinkage block (268) away from the lifting screw (43) and the inner wall of the push roller (5). The end of the shrinkage block (268) close to the lifting screw (43) is fixedly connected to the drive protrusion (46).

2. A high-pressure fire-tube boiler according to claim 1, characterized in that: The heat equalization component (9) includes a water inlet pipe (91) and a water outlet pipe (92). The water inlet pipe (91) is located at the lower end of the pot shell (b). There are multiple water inlet pipes (91), and the distance between the multiple water inlet pipes (91) increases sequentially from left to right. The water outlet pipe (92) is located at the upper end of the pot shell (b). There are multiple water outlet pipes (92), and each water outlet pipe (92) is located above the position of the corresponding water inlet pipe (91) on the pot shell (b).

3. A high-pressure fire-tube boiler according to claim 2, characterized in that: The inner diameter of the left end of the water replenishment chamber (1) is larger than that of the right end. The lower end of the water replenishment chamber (1) is connected to the water inlet pipe (91), and the upper end of the water replenishment chamber (1) is connected to the water outlet pipe (92).

4. A high-pressure fire-tube boiler according to claim 3, characterized in that: The rear end of the abutting rack (455) is rotatably connected to a rolling wheel (4551), and the rolling wheel (4551) is rotatably connected to the water replenishment chamber (1).

5. The high-pressure fire-tube boiler according to claim 4, characterized in that: The descaling component (6) includes a cleaning agent (61) and a descaling hole (62). The descaling hole (62) is opened on the descaling plate (7). There are multiple descaling holes (62). The position of each descaling hole (62) corresponds to the heat exchange tube (3). The cleaning agent (61) is placed in the reaction tank (21).

6. The high-pressure fire-tube boiler according to claim 3, characterized in that: The water replenishment chamber (1) is provided with a settling port (11) at the lower left end, and the settling port (11) is connected to the outside of the pot shell (b).

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