Boiler waste heat recycling structure and method thereof

Abstract

The invention discloses a boiler waste heat recycling structure and method in the technical field of boiler waste heat recycling, the boiler waste heat recycling structure comprises a heat exchange box and a water tank, a heat exchange pipe is arranged in the heat exchange box, a water outlet of the water tank is communicated with the heat exchange pipe through a communicating pipe, and the water tank can provide enough water for the heat exchange pipe; the water outlet end of the heat exchange pipe extends and penetrates through the outer side of the heat exchange box; a cleaning assembly capable of cleaning the inner wall of the heat exchange box and the pipe wall of the heat exchange pipe is arranged in the heat exchange box. The cleaning rod is tightly attached to the pipe wall of the heat exchange pipe through the elastic force of the first spring, even if the pipe wall is slightly uneven or the cleaning rod generates small displacement in the cleaning process, the first spring can conduct compensation in time, stable wiping pressure is always kept, cleaning blind areas caused by untight attachment are effectively avoided, and the cleaning efficiency is improved. And the thoroughness of erasing and cleaning is improved.

Description

Technical Field

[0001] This invention relates to the field of boiler waste heat recovery technology, specifically to a structure and method for boiler waste heat recovery and utilization. Background Technology

[0002] In thermal power plants, boilers, as the core heat energy supply equipment, generate a large amount of high-temperature flue gas containing waste heat during operation. Direct discharge of such flue gas not only causes serious energy waste but also exacerbates thermal pollution of the environment. Therefore, boiler waste heat recovery technology has become a key means to improve energy utilization efficiency and implement the concept of energy conservation and consumption reduction.

[0003] However, existing heat exchange tube coils commonly face the problem of ash and scale buildup during long-term waste heat recovery operation. The high-temperature flue gas from the boiler carries solid impurities such as dust and unburned carbon particles generated from fuel combustion. As these impurities flow through the heat exchange tube coil, they are easily deposited on the tube wall surface (especially at bends and in airflow vortex areas) due to changes in airflow velocity and the airflow disturbance caused by the coil's spiral structure, forming an ash layer. This ash layer, as an insulating medium with extremely low thermal conductivity, significantly increases the thermal resistance between the flue gas and the water inside the tubes, directly blocking the heat transfer path. This causes the heat exchange efficiency to continuously decline with prolonged operation. In some cases, severe ash accumulation can even block the inter-tube channels, affecting flue gas flow efficiency and resulting in poor waste heat recovery.

[0004] Based on this, the present invention designs a structure and method for recovering and utilizing waste heat from boilers to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a structure and method for recovering and utilizing waste heat from boilers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a boiler waste heat recovery and utilization structure, comprising a heat exchange box and a water tank, wherein a heat exchange tube is provided inside the heat exchange box, and the outlet of the water tank is connected to the heat exchange tube through a connecting pipe, and the water tank can provide a sufficient amount of water to the heat exchange tube; the outlet end of the heat exchange tube extends and penetrates the outside of the heat exchange box. The heat exchange box is equipped with a cleaning component that can clean its inner wall and the walls of the heat exchange tubes.

[0007] As a further embodiment of the present invention, the cleaning assembly includes a water storage machine capable of rotating circumferentially around the axis of the heat exchange box and performing high-pressure rinsing of the heat exchange tubes. The water storage machine is provided with a circumferential array of high-pressure nozzles, and a water tank capable of providing water to the high-pressure nozzles is fixedly connected inside the water storage machine. Each high-pressure nozzle is connected to the water tank through a water inlet pipe. The water tank is connected to a cleaning tank containing cleaning agent liquid via a water supply pipe; A drive block is fixedly connected to the rotating shaft of the heat exchange box; an electric rotating disk capable of driving the drive block to rotate in a circular motion is provided at the rotating shaft of the drive block, and an electric slide rail capable of driving the electric rotating disk to move back and forth is connected to the rotating shaft of the electric rotating disk, and the electric slide rail is an electric slide rail that can move back and forth of the water storage machine through the drive block.

[0008] As a further embodiment of the present invention, the cleaning assembly further includes a cleaning rod capable of wiping and cleaning the heat exchange tube; one end of the cleaning rod is provided with an opening to be in close contact with the heat exchange tube, and the other end of the cleaning rod is slidably connected to a fixed cylinder, and a first spring is fixedly connected between the cleaning rod and the fixed cylinder to make the cleaning rod press against the heat exchange tube. The end of the fixed cylinder away from the cleaning rod is slidably connected to the drive block via a sliding groove; The cleaning rod extends through and to the outside of the water storage tank at the end away from the fixed cylinder, and the cleaning rod is able to slide in the axial direction of the water storage tank.

[0009] As a further embodiment of the present invention, the cleaning assembly further includes a set of cleaning blocks slidably connected to the end of the cleaning rod away from the fixed cylinder, the two cleaning blocks being located on both sides of the end of the cleaning rod, and a contraction spring being provided between the two cleaning blocks to ensure that the cleaning blocks always clamp the heat exchange tube pipe.

[0010] As a further embodiment of the present invention, the portion of the water supply pipe located in the heat exchange box is a rubber pipe that is extendable in length and resistant to high temperatures.

[0011] As a further aspect of the present invention, the lower end of the heat exchange box is provided with a support bracket capable of supporting it.

[0012] As a further aspect of the present invention, the heat exchange tube adopts a spiral structure design.

[0013] A method for recovering waste heat from a boiler, the modified method for recovering waste heat from a boiler is as follows: S1: The high-temperature waste heat flue gas generated by the boiler enters the heat exchange box. S2: The water in the water tank is transported to the spiral heat exchange tube in the heat exchange box through the connecting pipe; S3: The high-temperature flue gas comes into full contact with the heat exchange tube wall, transferring heat to the water flowing inside the tube, thus realizing waste heat recovery.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The dual-power structure, which drives the water storage unit to rotate in a circular motion via an electric rotating disc and moves it back and forth via an electric slide rail, allows the high-pressure nozzle to form a composite motion trajectory of circumference and axial direction. This enables it to cover all cleaning areas of the heat exchange pipes and the inner wall of the heat exchange box without any blind spots, thus completely solving the problem of cleaning blind spots caused by single rotation or movement.

[0015] 2. The first spring ensures a tight fit between the cleaning rod and the heat exchange tube wall. Even if the tube wall has slight unevenness or the cleaning rod shifts slightly during cleaning, the first spring can compensate in time, maintaining a stable wiping pressure. This effectively avoids blind spots caused by poor fit and improves the thoroughness of wiping.

[0016] 3. The cleaning blocks maintain a tight clamping position on the heat exchange tube, with their inner sides closely adhering to the outer wall of the tube. As the cleaning rod rotates, the two cleaning blocks perform a circular friction motion around the heat exchange tube, effectively removing stubborn dirt, scale, and other impurities from the outer wall of the tube. This ensures that even after prolonged use and wear, the cleaning blocks can still clamp the heat exchange tube and effectively remove stubborn dirt, scale, and other impurities from the outer wall of the tube. This avoids the situation where, after prolonged use, the cleaning blocks become worn and unable to clean the outer wall of the heat exchange tube. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of a half-section of the heat exchange box of the present invention; Figure 3 This is a schematic diagram of the internal structure of the water storage unit of the present invention located in the heat exchange box; Figure 4 This is a schematic diagram of the exploded structure of the water storage device and water tank of the present invention; Figure 5 This is a detailed structural diagram of the water storage device of the present invention; Figure 6 This is a schematic diagram of the cleaning block and retraction spring structure of the present invention; Figure 7 This is a front view schematic diagram of the water storage device of the present invention; Figure 8 This is a schematic diagram of the process flow structure of the present invention; The attached diagram lists the components represented by each number as follows: 1. Heat exchange box; 2. Water tank; 3. Heat exchange pipe; 4. Connecting pipe; 5. Water storage unit; 6. High-pressure nozzle; 7. Water tank; 8. Drive block; 9. Ring motor; 10. Electric threaded rod; 11. Cleaning rod; 12. Fixed cylinder; 13. First spring; 14. Sliding groove; 15. Cleaning block; 16. Contraction spring; 17. Water supply pipe; 18. Cleaning box; 19. Support bracket. Detailed Implementation

[0018] Please see Figures 1-8 The present invention provides a technical solution: a structure and method for recovering and utilizing waste heat from a boiler, comprising a heat exchange box 1 and a water tank 2. The heat exchange box 1 is provided with a heat exchange pipe 3 inside. The outlet of the water tank 2 is connected to the heat exchange pipe 3 through a connecting pipe 4. The water tank 2 can provide a sufficient amount of water to the heat exchange pipe 3. The outlet end of the heat exchange pipe 3 extends and penetrates the outside of the heat exchange box 1. The heat exchange box 1 is equipped with a cleaning component that can clean its inner wall and the walls of the heat exchange tubes 3.

[0019] First, the high-temperature waste heat flue gas generated by the boiler enters the heat exchange box 1. At the same time, the water in the water tank 2 is transported to the heat exchange tube 3 in the heat exchange box 1 through the connecting pipe 4. The high-temperature flue gas comes into full contact with the tube wall of the heat exchange tube 3, transferring heat to the water flowing inside the tube, thus realizing waste heat recovery. The water that has absorbed heat flows out of the heat exchange box 1 from the outlet end of the heat exchange tube 3 for subsequent use. When a lot of impurities adhere to the heat exchange tube 3, the cleaning component is activated to simultaneously clean the tube wall of the heat exchange tube 3 and the inner wall of the heat exchange box 1.

[0020] This structure, through the cooperation of heat exchange tube 3 and heat exchange box 1, can efficiently absorb waste heat from the boiler to heat the water transported in water tank 2, achieving full recovery and utilization of waste heat, reducing energy waste, and improving energy utilization efficiency. The design of the cleaning component enables automated and comprehensive cleaning of the inner wall of heat exchange box 1 and the walls of heat exchange tube 3.

[0021] As a further embodiment of the present invention, the cleaning assembly includes a water storage machine 5 that can rotate circumferentially around the axis of the heat exchange box 1 and perform high-pressure rinsing of the heat exchange tube 3. The water storage machine 5 is provided with a circumferential array of high-pressure nozzles 6. A water tank 7 that can provide water to the high-pressure nozzles 6 is fixedly connected inside the water storage machine 5. Each of the high-pressure nozzles 6 is connected to the water tank 7 through a water inlet pipe. The water tank 7 is connected to a cleaning tank 18 containing cleaning agent liquid via a water supply pipe 17; A drive block 8 is fixedly connected to the rotating shaft of the heat exchange box 1; an electric rotating disk 9 is provided at the rotating shaft of the drive block 8, which can drive it to rotate in a circle; an electric slide rail 10 is connected at the rotating shaft of the electric rotating disk 9, which can drive it to move back and forth; the electric slide rail 10 is the electric slide rail 10 that can move back and forth of the water storage machine 5 through the drive block 8.

[0022] When the cleaning operation of heat exchange box 1 is started, the electric rotating disk 9 and the electric slide rail 10 operate synchronously. The electric rotating disk 9 drives the drive block 8 connected to it to rotate around the axis of heat exchange box 1. The drive block 8 simultaneously pulls the water storage machine 5 to rotate coaxially. The water tank 7 in the water storage machine 5 continuously supplies water to the high-pressure nozzles 6 in a circular array through the water inlet pipe. As the high-pressure nozzles 6 rotate with the water storage machine 5, they spray high-pressure water jets to perform a circular flushing of the pipe wall of heat exchange tube 3 and the inner wall of heat exchange box 1. At the same time, the start of the electric slide rail 10 drives the electric rotating disk 9, drive block 8 and water storage machine 5 to move back and forth in a linear motion along the axis of heat exchange box 1, realizing axial full-coverage flushing of the internal space of heat exchange box. The cleaning agent liquid in the cleaning tank 18 is transported to the water tank 7 through the water supply pipe 17. After mixing with clean water, it is sprayed out through the high-pressure nozzles 6. The chemical action of the cleaning agent combined with the physical impact of the high-pressure water jet enhances the dirt removal effect.

[0023] The dual-power structure, which drives the water storage tank 5 to rotate in a circle via the electric rotating disc 9 and moves it back and forth via the electric slide rail 10, allows the high-pressure nozzle 6 to form a composite motion trajectory of circumference and axial direction. This enables it to cover all cleaning areas of the heat exchange tube 3 and the inner wall of the heat exchange box 1 without any blind spots, thus completely solving the problem of cleaning blind spots caused by single rotation or movement.

[0024] As a further embodiment of the present invention, the cleaning assembly further includes a cleaning rod 11 capable of wiping and cleaning the heat exchange tube 3; one end of the cleaning rod 11 is provided with an opening that is in close contact with the heat exchange tube 3, and the other end of the cleaning rod 11 is slidably connected to a fixing cylinder 12; a first spring 13 that can make the cleaning rod 11 press against the heat exchange tube 3 is fixedly connected between the cleaning rod 11 and the fixing cylinder 12. The end of the fixed cylinder 12 away from the cleaning rod 11 is slidably connected to the drive block 8 through the sliding groove 14; The cleaning rod 11 extends through and to the outside of the water storage tank 5 at one end away from the fixed cylinder 12, and the cleaning rod 11 is able to slide in the axial direction of the water storage tank 5.

[0025] During cleaning, the first spring 13 between the cleaning rod 11 and the fixed cylinder 12 is always compressed. The spring force pushes the cleaning rod 11 to fit against the heat exchange tube 3, so that the opening at the end of the cleaning rod 11 fits tightly against the tube wall of the heat exchange tube 3. As the cleaning rod 11 rotates and reciprocates axially with the drive block 8, its end opening continuously rubs against the tube wall, wiping away scale, dirt and other impurities attached to the tube wall. At the same time, the end of the cleaning rod 11 away from the fixed cylinder 12 passes through the water storage tank 5 and can slide along the axis of the water storage tank 5. Even if there is a slight error between the water storage tank 5 and the cleaning rod 11 when it rotates and moves, it will not interfere with the movement of the cleaning rod 11, ensuring that the wiping action is continuous and stable.

[0026] The first spring 13 ensures a tight fit between the cleaning rod 11 and the heat exchange tube 3 wall. Even if the tube wall has slight unevenness or the cleaning rod 11 shifts slightly during cleaning, the first spring 13 can compensate in time, maintaining a stable wiping pressure and effectively avoiding blind spots caused by loose fit, thus improving the thoroughness of cleaning. The fixed cylinder 12 and the drive block 8 are slidably connected by the sliding groove 14, which, together with the sliding fit between the cleaning rod 11 and the water storage unit 5, allows the cleaning rod 11 to flexibly adapt to the circumferential rotation and reciprocating movement of the drive block 8, preventing mechanical jamming due to multi-directional movement and ensuring a smooth cleaning process. Compared to simple high-pressure water rinsing, mechanical wiping can directly remove stubborn impurities attached to the tube wall, complementing high-pressure rinsing and further improving the cleaning effect. At the same time, the cleaning rod has a simple structure, no complex electrical control components, and is easy and inexpensive to maintain.

[0027] As a further embodiment of the present invention, the cleaning assembly further includes a set of cleaning blocks 15 slidably connected to one end of the cleaning rod 11 away from the fixed cylinder 12. The two cleaning blocks 15 are respectively located on both sides of the end of the cleaning rod 11, and a contraction spring 16 is provided between the two cleaning blocks 15 to ensure that the cleaning blocks 15 always clamp the pipe of the heat exchange tube 3.

[0028] Under the elastic force of the retraction spring 16, the two cleaning blocks 15 always maintain a clamped state on the heat exchange tube 3, with their inner sides tightly fitted against the outer wall of the tube. As the cleaning rod 11 rotates circumferentially, the two cleaning blocks 15 perform a circular friction motion around the heat exchange tube 3, wiping away stubborn dirt, scale, and other impurities from the outer wall of the tube. This ensures that even if the cleaning blocks 15 wear down after prolonged use, they can still clamp the heat exchange tube 3 and effectively remove stubborn dirt, scale, and other impurities from the outer wall of the tube. This avoids the situation where, after prolonged use, the cleaning blocks 15 become worn and unable to clean the outer wall of the heat exchange tube 3.

[0029] As a further embodiment of the present invention, the portion of the water supply pipe 17 located in the heat exchange box 1 is a rubber pipe that is extendable and resistant to high temperatures.

[0030] As a further embodiment of the present invention, the lower end of the heat exchange box 1 is provided with a support bracket 18 that can support it.

[0031] As a further embodiment of the present invention, the heat exchange tube 3 adopts a spiral structure design.

[0032] A method for recovering waste heat from a boiler, the modified method for recovering waste heat from a boiler is as follows: S1: The high-temperature waste heat flue gas generated by the boiler enters the heat exchange box 1. S2: The water in the water tank 2 is transported to the spiral heat exchange tube 3 in the heat exchange box 1 through the connecting pipe 4; S3: The high-temperature flue gas comes into full contact with the wall of heat exchange tube 3, transferring heat to the water flowing inside the tube and realizing waste heat recovery.

Claims

1. A boiler waste heat recovery and utilization structure, comprising a heat exchange box (1) and a water tank (2), characterized in that: The heat exchange box (1) is equipped with a heat exchange tube (3) inside. The outlet of the water tank (2) is connected to the heat exchange tube (3) through a connecting pipe (4). The water tank (2) can provide a sufficient amount of water to the heat exchange tube (3). The outlet of the heat exchange tube (3) extends and penetrates the outside of the heat exchange box (1). The heat exchange box (1) is equipped with a cleaning component that can clean its inner wall and the walls of the heat exchange tubes (3).

2. The boiler waste heat recovery and utilization structure according to claim 1, characterized in that: The cleaning assembly includes a water tank (5) that can rotate circumferentially around the axis of the heat exchange box (1) and perform high-pressure rinsing of the heat exchange tube (3). The water tank (5) is provided with a high-pressure nozzle (6) arranged in a circumferential array. A water tank (7) that can provide water to the high-pressure nozzle (6) is fixedly connected inside the water tank (5). Each high-pressure nozzle (6) is connected to the water tank (7) through a water inlet pipe. The water tank (7) is connected to a cleaning tank (18) containing cleaning agent liquid via a water supply pipe (17). A drive block (8) is fixedly connected to the rotating shaft of the heat exchange box (1); an electric rotating disk (9) capable of driving it to rotate in a circle is provided at the rotating shaft of the drive block (8); an electric slide rail (10) capable of driving it to move back and forth is connected to the rotating shaft of the electric rotating disk (9); the electric slide rail (10) is an electric slide rail (10) that can move back and forth between the water storage machine (5) and the drive block (8).

3. The boiler waste heat recovery and utilization structure according to claim 2, characterized in that: The cleaning assembly also includes a cleaning rod (11) capable of wiping and cleaning the heat exchange tube (3); one end of the cleaning rod (11) is provided with an opening that is in close contact with the heat exchange tube (3), and the other end of the cleaning rod (11) is slidably connected to a fixing cylinder (12). A first spring (13) is fixedly connected between the cleaning rod (11) and the fixing cylinder (12) to make the cleaning rod (11) press against the heat exchange tube (3). The end of the fixed cylinder (12) away from the cleaning rod (11) is slidably connected to the drive block (8) through the sliding groove (14); The cleaning rod (11) extends through and to the outside of the water storage tank (5) at the end away from the fixed cylinder (12), and the cleaning rod (11) is able to slide in the axial direction of the water storage tank (5).

4. The boiler waste heat recovery and utilization structure according to claim 3, characterized in that: The cleaning assembly also includes a set of cleaning blocks (15) slidably connected to one end of the cleaning rod (11) away from the fixed cylinder (12). The two cleaning blocks (15) are located on both sides of the end of the cleaning rod (11), and a contraction spring (16) is provided between the two cleaning blocks (15) to ensure that the cleaning blocks (15) always clamp the heat exchange tube (3).

5. The boiler waste heat recovery and utilization structure according to claim 1, characterized in that: The portion of the water supply pipe (17) located in the heat exchange box (1) is a rubber pipe that can be extended in length and is resistant to high temperatures.

6. The structure and method for boiler waste heat recovery and utilization according to claim 1, characterized in that: The lower end of the heat exchange box (1) is provided with a support (18) that can support it.

7. The boiler waste heat recovery and utilization structure according to claim 1, characterized in that: The heat exchange tube (3) adopts a spiral structure design.

8. A boiler waste heat recovery method, applicable to the boiler waste heat recovery and utilization structure described in any one of claims 1-7, characterized in that: The method for recovering waste heat from the boiler is as follows: S1: The high-temperature waste heat flue gas generated by the boiler enters the heat exchange box (1); S2: The water in the water tank (2) is transported to the spiral heat exchange tube (3) in the heat exchange box (1) through the connecting pipe (4); S3: The high-temperature flue gas comes into full contact with the heat exchange tube (3) wall, transferring heat to the water flowing inside the tube to achieve waste heat recovery.

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