Flue gas cooling device for thermal power plant
By designing a flue gas cooling device including spiral heat exchange pipes and cleaning components in a thermal power plant, the problem of high-temperature flue gas heat not being effectively utilized is solved, effective cooling and desulfurization of flue gas is realized, and energy efficiency is improved. Economic benefits.
Patent Information
- Application Number
- CN202411649905.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-02-18
AI Technical Summary
When the medium and high-temperature flue gas in the existing thermal power plants is desulfurized during the spray tower, the heat in the flue gas is not effectively utilized, resulting in waste of heat resources.
A flue gas cooling device for thermal power plants is designed, including heat exchange pipes and smoke exhaust pipes. The heat exchange pipe consists of a first pipe section, a second pipe section and a third pipe section. The second pipe section is spirally wound along the central axis of the smoke exhaust pipe to pass in heat exchange and cool the high-temperature flue gas. At the same time, the device also includes a cleaning assembly and a driving assembly for cleaning dust on the outer peripheral wall of the heat exchange tube.
Through this device, heat in high-temperature flue gas can be effectively recovered, white mist formation when the flue gas comes into contact with the spray liquid, desulfurization treatment efficiency can be improved, and cost-saving.
Smart Images
Figure CN119468239A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present disclosure belong to the technical field of flue gas cooling in thermal power plants, and specifically relate to a flue gas cooling device for thermal power plants. Background Art
[0002] During operation, thermal power plants generate electricity by burning coal, which forms sulfur-containing gas (high-temperature flue gas). The high-temperature flue gas is usually directly desulfurized through a spray tower, without effectively utilizing the heat in the high-temperature flue gas. Summary of the invention
[0003] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a flue gas cooling device for a thermal power plant.
[0004] The embodiment of the present disclosure provides a flue gas cooling device for a thermal power plant, the flue gas cooling device comprising a heat exchange tube and a smoke exhaust pipe; The heat exchange tube includes a first tube section, a second tube section and a third tube section; the first end of the first tube section is located outside the smoke exhaust pipe, and the second end thereof passes through the side wall of the smoke exhaust pipe and is connected with the first end of the second tube section; the second tube section is located inside the smoke exhaust pipe and is spirally wound along the length direction of the central axis of the smoke exhaust pipe, and the second end thereof is connected with the first end of the third tube section; the second end of the third tube section passes through the side wall of the smoke exhaust pipe and is located outside the smoke exhaust pipe; wherein, The heat exchange tube is used for passing heat exchange liquid, one end of the smoke exhaust pipe is used for receiving high-temperature smoke, and the other end of the smoke exhaust pipe is used for outputting low-temperature smoke to the spray tower.
[0005] Optionally, the flue gas cooling device further includes a cleaning component and a driving component; The cleaning assembly comprises a sliding ring which is slidably mounted on the second pipe section; the driving assembly is located in the smoke exhaust pipe and is used to drive the sliding ring to slide along the second pipe section to clean the dust on the outer peripheral wall of the second pipe section.
[0006] Optionally, the driving assembly includes a first rotating shaft, a sliding sleeve, a sliding rod and a driving part; The first rotating shaft is arranged along the axial direction of the smoke exhaust pipe and is located in the central area where the second pipe section is spirally wound, and the first rotating shaft is provided with a through groove along the axial direction thereof; The sliding sleeve is slidably sleeved on the first rotating shaft, and the first end of the sliding rod is slidably penetrated through the through groove and the sliding sleeve along the radial direction of the first rotating shaft, and can slide along the axial direction of the first rotating shaft; The first end of the sliding rod is universally connected to the sliding ring, and the driving part is used to drive the first rotating shaft to rotate.
[0007] Optionally, the first end of the sliding rod is universally connected to the sliding ring via a universal joint.
[0008] Optionally, the axis of the first rotating shaft coincides with the central axis of the smoke exhaust pipe.
[0009] Optionally, the driving unit includes a motor fixed to the smoke exhaust pipe, a first transmission shaft, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear and a second transmission shaft; The first transmission shaft is located on a side of the first pipe section away from the third pipe section, and both ends of the first transmission shaft are respectively connected to the output shaft of the motor and the first bevel gear, and the second bevel gear is meshed with the first bevel gear and connected to one end of the first rotating shaft; The other end of the first rotating shaft is transmission-connected to the third bevel gear, the third bevel gear is meshed with the fourth bevel gear, the fourth bevel gear is transmission-connected to the second transmission shaft, the second transmission shaft is rotatably connected to the smoke exhaust pipe, and the second transmission shaft is located on the side of the third pipe section away from the first pipe section.
[0010] Optionally, the first transmission shaft and the second transmission shaft are both perpendicular to the first rotating shaft.
[0011] Optionally, the flue gas cooling device further includes a first fixing bracket and a second fixing bracket; The first end of the first fixing bracket is fixedly connected to the inner side wall of the smoke exhaust pipe, and the second end of the first fixing bracket is connected to the first transmission shaft; The first end of the second fixing bracket is fixedly connected to the inner wall of the smoke exhaust pipe, and the second end of the second fixing bracket is connected to the second transmission shaft.
[0012] Optionally, the spiral diameter of the second pipe section is arranged to decrease from the first end to the second end thereof.
[0013] Optionally, the cleaning assembly further comprises a cleaning ring; The outer peripheral wall of the cleaning ring is connected to the inner peripheral wall of the sliding ring, and the inner peripheral wall of the cleaning ring abuts against the outer peripheral wall of the second pipe section.
[0014] The flue gas cooling device for a thermal power plant according to the embodiment of the present disclosure can recycle heat in the high-temperature flue gas through a heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a structural schematic diagram of a flue gas cooling device for a thermal power plant according to an embodiment of the present disclosure; Figure 2 for Figure 1Schematic diagram of some structures inside the middle smoke exhaust pipe; Figure 3 It is a schematic diagram of a part of the structure inside the smoke exhaust pipe of another embodiment of the present disclosure; Figure 4 for Figure 3 An enlarged schematic diagram of some structures in . DETAILED DESCRIPTION
[0016] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0017] like Figure 1 and Figure 2 As shown, a flue gas cooling device 100 for a thermal power plant includes a heat exchange tube 110 and a smoke exhaust pipe 120. The heat exchange tube 110 includes a first tube section 111, a second tube section 112 and a third tube section 113. The first end of the first tube section 111 is located outside the smoke exhaust pipe 120, and the second end thereof passes through the side wall of the smoke exhaust pipe 120 and is connected to the first end of the second tube section 112. The second tube section 112 is located inside the smoke exhaust pipe 120 and is spirally wound along the length direction of the central axis of the smoke exhaust pipe 120, and the second end thereof is connected to the first end of the third tube section 113. The second end of the third tube section 113 passes through the side wall of the smoke exhaust pipe 120 and is located outside the smoke exhaust pipe 120. The heat exchange tube 110 is used to pass heat exchange liquid, one end of the smoke exhaust pipe 120 is used to receive high-temperature flue gas, and the other end of the smoke exhaust pipe 120 is used to output low-temperature flue gas to a spray tower (not shown in the figure).
[0018] Specifically, Figure 1 and Figure 2 As shown, the high-temperature flue gas enters from the lower end of the smoke exhaust pipe 120, passes through the heat exchange tube 110, and is then discharged from the upper end of the smoke exhaust pipe 120 and transported to the spray tower for desulfurization treatment. The specific working process is as follows: the high-temperature flue gas generated by the combustion of coal in the thermal power plant enters the smoke exhaust pipe 120, and at the same time, a heat exchange liquid is introduced into the heat exchange tube 110. The heat exchange liquid introduced into the heat exchange tube 110 is used to exchange heat and cool the high-temperature flue gas in the smoke exhaust pipe 120. After the high-temperature flue gas is cooled, it can be convenient for the subsequent treatment of the high-temperature flue gas. After the high-temperature flue gas is cooled, it becomes low-temperature flue gas. The low-temperature flue gas is discharged from the smoke exhaust pipe 120 to the spray tower, and desulfurization and other harmful components are removed through the spray tower.
[0019] Since high-temperature flue gas directly enters the spray tower and contacts the spray liquid, a large amount of white mist will be generated. Reducing the temperature of the high-temperature flue gas before sending it into the spray tower to contact the spray liquid can reduce the white mist formed when the flue gas contacts the spray liquid. And after the heat exchange liquid in the heat exchange tube absorbs the heat of the high-temperature flue gas, the heat exchange liquid can be used for heating and power generation later.
[0020] The second pipe section 112 is spirally shaped in the smoke exhaust pipe 120, and the spirally shaped second pipe section can better contact the high-temperature flue gas to provide a heat exchange effect. Furthermore, the spiral diameter of the second pipe section 112 is set in a decreasing state from the first end to the second end. In other words, the second pipe section is in the smoke exhaust pipe along the direction close to the high-temperature flue gas entering, and the spiral diameter gradually decreases. Such a setting can better provide a heat exchange effect and save costs.
[0021] The flue gas cooling device for a thermal power plant according to the embodiment of the present disclosure can recycle heat in high-temperature flue gas through heat exchange tubes, and the spiral heat exchange tubes can also better contact the high-temperature flue gas to provide a better heat exchange effect.
[0022] For example, Figures 2 to 4 The smoke cooling device 100 further includes a cleaning assembly 130 and a driving assembly 140. The cleaning assembly 130 includes a sliding ring 131, and the sliding ring 131 is slidably sleeved on the second pipe section 112. The driving assembly 140 is located in the smoke exhaust pipe 120, and is used to drive the sliding ring 131 to slide along the second pipe section 112 to clean the dust on the outer peripheral wall of the second pipe section 112.
[0023] Furthermore, the driving assembly 140 includes a first rotating shaft 141, a sliding sleeve 142, a sliding rod 143 and a driving part 144. The first rotating shaft 141 is arranged along the axial direction of the smoke exhaust pipe 120 and is located in the central area where the second pipe section 112 is spirally wound. The first rotating shaft 141 is provided with a through groove 1411 along its axial direction. The sliding sleeve 142 is slidably sleeved on the first rotating shaft 141, and the first end of the sliding rod 143 is slidably penetrated in the through groove 1411 and the sliding sleeve 142 along the radial direction of the first rotating shaft 141, and can slide along the axial direction of the first rotating shaft 141. The first end of the sliding rod 143 is universally connected to the sliding ring 131, and the driving part 144 is used to drive the first rotating shaft 141 to rotate.
[0024] Specifically, Figures 2 to 4As shown, the first rotating shaft 141 is provided with a through slot 1411 along its axial direction, and the sliding sleeve 142 is slidably mounted on the first rotating shaft 141. The first end of the sliding rod 143 can slide through the through slot 1411 and the sliding sleeve 142 along the radial direction of the first rotating shaft 141, and the sliding rod 143 can also slide along the axial direction of the first rotating shaft 141. The first end of the sliding rod 143 is universally connected with a sliding ring 131, and the sliding ring 131 is slidably mounted on the second pipe section 112. The driving part 144 is used to drive the first rotating shaft 141 to rotate forward and reverse. When the first rotating shaft 141 rotates, the sliding sleeve 142 and the sliding rod 143 are driven to rotate, and the sliding sleeve 142 and the sliding rod 143 drive the sliding ring 131 to rotate. The sliding ring 131 moves along the second pipe section 112 and drives the sliding sleeve 142 and the sliding rod 143 to slide up and down relative to the first rotating shaft 141. Since a large amount of dust will adhere to the outer surface of the heat exchange tube after working for a period of time, the dust adhered to the outer peripheral wall of the second tube section 112 can be cleaned by the sliding sliding ring 131 .
[0025] For example, Figures 1 to 4 As shown, the driving unit 144 includes a motor 1441 fixed to the smoke exhaust pipe 120, a first transmission shaft 1442, a first bevel gear 1443, a second bevel gear 1444, a third bevel gear 1445, a fourth bevel gear 1446, and a second transmission shaft 1447. The first transmission shaft 1442 is located at a side of the first pipe section 111 away from the third pipe section 113, and the two ends of the first transmission shaft 1442 are respectively connected to the output shaft of the motor 1441 and the first bevel gear 1443, and the second bevel gear 1444 is meshed with the first bevel gear 1443 and is connected to one end of the first rotating shaft 141.
[0026] The other end of the first rotating shaft 141 is transmission connected to the third bevel gear 1445, the third bevel gear 1445 is meshed with the fourth bevel gear 1446, the fourth bevel gear 1446 is transmission connected to the second transmission shaft 1447, the second transmission shaft 1447 is rotatably connected to the smoke exhaust pipe 120, and the second transmission shaft 1447 is located on the side of the third pipe section 113 away from the first pipe section 111.
[0027] Specifically, Figures 1 to 4As shown, the motor 1441 is fixed to the smoke exhaust pipe 120. After the heat exchange tube has been working for a period of time, a large amount of dust will be attached to the second tube section 112. In order to improve the heat exchange effect of the heat exchange tube, it is necessary to clean the dust attached to the outer peripheral wall of the second tube section 112. The cleaning process is as follows: start the motor 1441, the motor 1441 can rotate forward and reverse, and the motor 1441 rotates and passes through the first transmission shaft 1442, the first bevel gear 1443, the second bevel gear 1444, and the third bevel gear 1445. 45. The fourth bevel gear 1446 and the second transmission shaft 1447 work together to drive the first rotating shaft 141 to rotate, thereby driving the sliding sleeve 142 and the sliding rod 143 to rotate. The sliding sleeve 142 and the sliding rod 143 drive the sliding ring 131 to rotate. The sliding ring 131 moves along the second pipe section 112 and drives the sliding sleeve 142 and the sliding rod 143 to slide up and down relative to the first rotating shaft 141. The sliding sliding ring 131 can clean the dust attached to the outer peripheral wall of the second pipe section 112.
[0028] Furthermore, if Figure 3 and Figure 4 As shown, the cleaning assembly 130 further includes a cleaning ring 132 . The outer peripheral wall of the cleaning ring 132 is connected to the inner peripheral wall of the sliding ring 131 , and the inner peripheral wall of the cleaning ring 132 abuts against the outer peripheral wall of the second pipe section 112 .
[0029] Specifically, Figure 3 and Figure 4 As shown, the cleaning ring 132 is built into the sliding ring 131 and abuts against the outer peripheral wall of the second pipe section 112. The outer peripheral wall of the second pipe section can be better cleaned by providing the cleaning ring. The cleaning ring can be provided as a stainless steel cleaning brush, a cleaning brush of other materials, etc.
[0030] For example, Figures 1 to 4 As shown, the first end of the sliding rod 143 is universally connected to the sliding ring 131 through a universal joint 1311. Further, the axis of the first rotating shaft 141 coincides with the central axis of the smoke exhaust pipe 120. Furthermore, the first transmission shaft 1442 and the second transmission shaft 1447 are both perpendicular to the first rotating shaft 141.
[0031] For example, Figures 1 to 3 As shown, the smoke cooling device 100 further includes a first fixing bracket 150 and a second fixing bracket 160. The first end of the first fixing bracket 150 is fixedly connected to the inner side wall of the smoke exhaust pipe 120, and the second end thereof is connected to the first transmission shaft 1442. The first end of the second fixing bracket 160 is fixedly connected to the inner side wall of the smoke exhaust pipe 120, and the second end thereof is connected to the second transmission shaft 1447.
[0032] Specifically, Figures 1 to 3As shown, the first bracket 150 and the second bracket 160 are both built into the smoke exhaust pipe 120. The first bracket 150 and the second bracket 160 are respectively used to fix and support the relevant components located at the upper end of the smoke exhaust pipe 120 and the relevant components located at the lower end of the smoke exhaust pipe 120. Among them, the first transmission shaft 1442 is rotatably connected to the first bracket 150, and the second transmission shaft 1447 is rotatably connected to the second bracket 160.
[0033] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.
Claims
1. A flue gas cooling device for a thermal power plant, characterized in that: The smoke cooling device comprises a heat exchange tube and a smoke exhaust pipe; The heat exchange tube includes a first tube section, a second tube section and a third tube section; the first end of the first tube section is located outside the smoke exhaust pipe, and the second end thereof passes through the side wall of the smoke exhaust pipe and is connected with the first end of the second tube section; the second tube section is located inside the smoke exhaust pipe and is spirally wound along the length direction of the central axis of the smoke exhaust pipe, and the second end thereof is connected with the first end of the third tube section; the second end of the third tube section passes through the side wall of the smoke exhaust pipe and is located outside the smoke exhaust pipe; wherein, The heat exchange tube is used for passing heat exchange liquid, one end of the smoke exhaust pipe is used for receiving high-temperature smoke, and the other end of the smoke exhaust pipe is used for outputting low-temperature smoke to the spray tower.
2. The flue gas cooling device for a thermal power plant according to claim 1, characterized in that: The flue gas cooling device also includes a cleaning component and a driving component; The cleaning assembly comprises a sliding ring which is slidably mounted on the second pipe section; the driving assembly is located in the smoke exhaust pipe and is used to drive the sliding ring to slide along the second pipe section to clean the dust on the outer peripheral wall of the second pipe section.
3. The flue gas cooling device for a thermal power plant according to claim 2, characterized in that: The driving assembly comprises a first rotating shaft, a sliding sleeve, a sliding rod and a driving part; The first rotating shaft is arranged along the axial direction of the smoke exhaust pipe and is located in the central area where the second pipe section is spirally wound, and the first rotating shaft is provided with a through groove along the axial direction thereof; The sliding sleeve is slidably sleeved on the first rotating shaft, and the first end of the sliding rod is slidably penetrated through the through groove and the sliding sleeve along the radial direction of the first rotating shaft, and can slide along the axial direction of the first rotating shaft; The first end of the sliding rod is universally connected to the sliding ring, and the driving part is used to drive the first rotating shaft to rotate.
4. The flue gas cooling device for a thermal power plant according to claim 3, characterized in that: The first end of the sliding rod is universally connected to the sliding ring through a universal joint.
5. The flue gas cooling device for a thermal power plant according to claim 3, characterized in that: The axis of the first rotating shaft coincides with the central axis of the smoke exhaust pipe.
6. The flue gas cooling device for a thermal power plant according to claim 3, characterized in that: The driving part includes a motor fixed to the smoke exhaust pipe, a first transmission shaft, a first bevel gear, a second bevel gear, a third bevel gear, a fourth bevel gear and a second transmission shaft; The first transmission shaft is located on a side of the first pipe section away from the third pipe section, and both ends of the first transmission shaft are respectively connected to the output shaft of the motor and the first bevel gear, and the second bevel gear is meshed with the first bevel gear and connected to one end of the first rotating shaft; The other end of the first rotating shaft is transmission-connected to the third bevel gear, the third bevel gear is meshed with the fourth bevel gear, the fourth bevel gear is transmission-connected to the second transmission shaft, the second transmission shaft is rotatably connected to the smoke exhaust pipe, and the second transmission shaft is located on the side of the third pipe section away from the first pipe section.
7. The flue gas cooling device for a thermal power plant according to claim 6, characterized in that: The first transmission shaft and the second transmission shaft are both perpendicular to the first rotating shaft.
8. The flue gas cooling device for a thermal power plant according to claim 6, characterized in that: The flue gas cooling device also includes a first fixing bracket and a second fixing bracket; The first end of the first fixing bracket is fixedly connected to the inner side wall of the smoke exhaust pipe, and the second end of the first fixing bracket is connected to the first transmission shaft; The first end of the second fixing bracket is fixedly connected to the inner wall of the smoke exhaust pipe, and the second end of the second fixing bracket is connected to the second transmission shaft.
9. The flue gas cooling device for a thermal power plant according to any one of claims 1 to 8, characterized in that: The spiral diameter of the second pipe section is arranged to decrease from the first end to the second end thereof.
10. The flue gas cooling device for a thermal power plant according to any one of claims 2 to 8, characterized in that: The cleaning assembly also includes a cleaning ring; The outer peripheral wall of the cleaning ring is connected to the inner peripheral wall of the sliding ring, and the inner peripheral wall of the cleaning ring abuts against the outer peripheral wall of the second pipe section.