Tail double-flue structure of secondary reheating boiler

Abstract

The invention discloses a secondary reheating boiler tail double-flue structure, which relates to the field of boiler heat recovery, and comprises a boiler tail receiving bin, a mounting pipe and a processing body, the processing body is provided with an expansion bag body, the processing body is internally provided with a first smoke barrier and a second smoke barrier, and an adjusting piece is mounted between the first smoke barrier and the second smoke barrier; according to the tail double-flue structure of the secondary reheating boiler, the treatment body and the first smoke barrier and the second smoke barrier which are arranged in the treatment body are combined for use, so that smoke is divided into a plurality of treatment channels; according to the heat dissipation device for the boiler, heat of smoke discharged by the boiler is divided into multiple paths to be subjected to heat dissipation treatment, the first smoke baffle, the second smoke baffle, the first guide plate, the second guide plate and the third guide plate are distributed to be assembled into different heat dissipation channels, the layer-by-layer treatment effect is achieved, and then smoke is prevented from being concentrated and gathered in the discharging process.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler heat, and specifically to a double flue structure at the tail of a secondary reheat boiler. Background Art

[0002] The secondary reheat boiler is an energy-efficient technology in the field of thermal power generation. Its core lies in the two-stage intermediate reheat of steam. During the secondary reheat, the main steam returns to the boiler for reheat twice after doing work in the ultra-high pressure cylinder and the high pressure cylinder, and finally enters the medium and low pressure cylinders. This process increases the enthalpy value and dryness of the steam, thereby improving the efficiency.

[0003] During existing thermal power generation, the high-temperature steam generated is discharged through the flue, and then returns to the boiler for reheat treatment through the high-pressure cylinder, etc. However, due to the excessive heat generated during thermal power generation, when the soot is discharged through a single flue, a large amount of heat is mixed. Excessive heat easily causes the flue of the secondary reheat to overheat. After the flue overheats, the soot is likely to stick to the inner wall of the flue. To solve the problem of flue smoke exhaust caused by secondary reheat, a smoke baffle is designed to reduce the smoke heat. However, for the design of the low baffle, when the smoke contacts the baffle, the baffle blocks the smoke. When the temperature drops, the baffle cannot be adjusted in time, so it is not convenient to gradually reduce the smoke while reducing the smoke exhaust speed. Moreover, because the temperature in the smoke is different, heat waste occurs during the secondary reheat of the boiler smoke heat. For this reason, we propose a double flue structure at the tail of a secondary reheat boiler. Summary of the Invention

[0004] The purpose of the present invention is to provide a double flue structure at the tail of a secondary reheat boiler to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A double flue at the tail of a secondary reheat boiler includes a set of boiler receiving bins, and the boiler receiving bins are connected through a circulation pipe. An installation pipe is connected to the boiler tail receiving bin, and one end of the installation pipe is connected to a processing body. One end of the processing body is communicated with a flue pipe, and the tail of the flue pipe is communicated with an induced draft fan for exhausting smoke. A hot air pipe is installed on the flue pipe; the inside of the processing body is a cavity, and a plurality of installation slots are equiangularly opened on the processing body, and expansion bladder bodies are installed in the installation slots. Smoke inlet holes are opened on the expansion bladder bodies and aligned with the cavity. The plurality of expansion bladder bodies are communicated through a telescopic pipe. A circulation member is installed on the top of one of the expansion bladder bodies. One end of the circulation member is communicated with the hot air pipe, and the other end of the circulation member is communicated with the boiler tail receiving bin; a first smoke baffle and a second smoke baffle are arranged in the processing body. The bottom of the second smoke baffle is connected to the end of the first smoke baffle, and an adjustment member is installed between the first smoke baffle and the second smoke baffle. A rotating shaft is arranged between the first smoke baffle and the second smoke baffle, and a temperature sensing probe is installed on the rotating shaft. After the temperature detected by the temperature sensing probe decreases, the adjustment member drives the first smoke baffle and the second smoke baffle to rotate, changing the flow direction of the smoke in the processing body.

[0006] Preferably, an inlet plug body is arranged inside the processing body, and the first smoke baffle and the second smoke baffle are installed outside the inlet plug body. A smoke port is opened on the inlet plug body, and the smoke port is inclined.

[0007] Preferably, three expansion bladder bodies are provided. The opening positions of the smoke inlet holes on the expansion bladder bodies are staggered, and the center lines of the smoke inlet holes are spirally distributed inside the processing body. The opening direction of the smoke port is aligned with the smoke inlet hole of the outermost expansion bladder body.

[0008] Preferably, a first guiding plate, a second guiding plate and a third guiding plate are equiangularly connected to the inlet plug body. The lengths of the first guiding plate, the second guiding plate and the third guiding plate increase in sequence. Extension plates are connected to both the first guiding plate and the second guiding plate. Circular holes corresponding to the smoke inlet are opened on the first guiding plate, the second guiding plate and the third guiding plate, and telescopic arc sections are arranged at the connection positions of the first guiding plate, the second guiding plate, the third guiding plate and the inlet plug body.

[0009] Preferably, one end of the rotating shaft of the second smoke baffle is rotatably connected to the inner wall of the processing body, and the second smoke baffle is connected to the first smoke baffle through a bending rod. The first smoke baffle and the first guiding plate form a first channel, and the smoke enters the outermost expansion bladder body from the first channel. The back of the first smoke baffle and the second guiding plate form a second channel, and the second smoke baffle and the third guiding plate form a third channel. The adjustment member adjusts the positions of the first smoke baffle and the second smoke baffle, thereby adjusting the smoke inlet volume of different channels.

[0010] Preferably, the adjusting member includes a rotating motor installed on the inlet plug body. A rotating rod is connected to the output shaft of the rotating motor. A driving gear is connected to the top of the rotating rod. A driven gear meshing with the driving gear is connected to the rotating shaft of the first smoke baffle. A rotating groove is provided at the bottom of the driving gear, and a rotating block is rotatably connected inside the rotating groove. A plurality of electric telescopic rods are connected to the bottom of the rotating block, and the output ends of the plurality of electric telescopic rods are connected with an adjusting gear. A mating gear is connected to the rotating shaft of the second smoke baffle. A tapered sleeve is sleeved on the adjusting gear, and a tapered plug block cooperating with the tapered sleeve is rotatably connected to the rotating rod.

[0011] Preferably, the circulating member includes a circulating receiver provided at the top of the expansion bladder. A return pipe communicating with the receiving bin at the tail of the boiler is connected to the circulating receiver, and a heating pipe communicating with the hot air pipe is connected to the circulating receiver. A blower pipe is communicated with the outside of the circulating receiver, and a blower is connected to one end of the blower pipe.

[0012] Preferably, the expansion bladder is trapezoidal in reverse, and the outer layer of the expansion bladder is a telescopic layer. The plurality of expansion bladders and the telescopic pipes are combined into a ring shape and distributed outside the processing body.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] By designing two smoke pipes, before the smoke enters the smoke pipe, through the combined use of the processing body and the first smoke baffle and the second smoke baffle arranged inside, the smoke is divided into multiple processing channels, which is beneficial to dividing the heat of the smoke discharged from the boiler into multiple paths for heat dissipation treatment. And because the first smoke baffle and the second smoke baffle are distributed and assembled with the first guiding plate, the second guiding plate and the third guiding plate to form different heat dissipation channels, the effect of layer-by-layer processing is realized, thereby avoiding the concentrated convergence of the smoke during the discharge process, and segmentally processing the smoke is beneficial to separately processing the smoke at different temperatures and avoiding heat waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 is a schematic diagram of the structure at a single flue pipe of the present invention;

[0017] Figure 3 is a schematic diagram of the structure at the processing body of the present invention;

[0018] Figure 4 is a schematic diagram of the structure of the expansion bladder, the first baffle and the second baffle of the present invention;

[0019] Figure 5 is a schematic diagram of the structure of the expansion bladder of the present invention;

[0020] Figure 6 Structural schematic diagram of the inlet plug body of the present invention;

[0021] Figure 7 is Figure 6 structural schematic diagram of the back side;

[0022] Figure 8 Structural schematic diagram of the first smoke baffle, the second smoke baffle and the adjusting member of the present invention;

[0023] Figure 9 Structural schematic diagram of the adjusting member of the present invention.

[0024] In the figure: 1. Boiler tail receiving bin; 2. Processing body; 3. Flue duct; 4. Induced draft fan; 5. Hot air duct; 6. Circulating member; 7. Adjusting member; 8. Inlet plug body; 11. Circulating pipe; 12. Installation pipe; 13. Electromagnetic solenoid valve; 21. Installation groove; 22. Expansion bladder; 23. Smoke inlet hole; 24. Telescopic pipe; 25. First smoke baffle; 26. Second smoke baffle; 27. Bending rod; 28. Rotating shaft; 29. Temperature sensing probe; 61. Circulating receiving body; 62. Return pipe; 63. Heating pipe; 64. Blowing pipe; 65. Blower; 66. Switch valve; 71. Rotating motor; 72. Rotating rod; 73. Driving gear; 74. Driven gear; 75. Rotating groove; 76. Rotating block; 77. Electric telescopic rod; 78. Adjusting gear; 79. Matching gear; 81. Smoke port; 82. First guiding plate; 83. Second guiding plate; 84. Third guiding plate; 85. Expansion plate; 86. Round hole; 87. Telescopic arc section; 781. Tapered sleeve; 782. Tapered plug block. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1

[0027] Please refer to Figures 1-6 , a double flue structure at the tail of a secondary reheat boiler shown in the figure.

[0028] In this solution: A double flue structure at the tail of a secondary reheat boiler includes the following steps:

[0029] A group of boiler tail receiving bins 1, a sensor for detecting smoke concentration is arranged inside the boiler tail receiving bin 1, an existing general sensor is selected to detect the smoke concentration inside the boiler tail receiving bin 1, the boiler tail receiving bin 1 is installed on the boiler tail, and the heat of thermal power generation is discharged from the boiler tail to the boiler tail receiving bin 1. Two groups of boiler tail receiving bins 1 are arranged, which is conducive to dividing the heat of the boiler into two components, and the boiler tail receiving bins 1 are connected through a circulation pipe 11, so that the smoke volume between the two boiler tail receiving bins 1 is balanced with each other, avoiding the problem of excessive smoke volume in one and insufficient smoke volume in the other. The boiler tail receiving bin 1 is connected with an installation pipe 12, and one end of the installation pipe 12 is connected with a processing body 2, one end of the processing body 2 is connected with a flue pipe 3, the tail of the flue pipe 3 is connected with an exhaust induced draft fan 4, and a hot air pipe 5 is installed on the flue pipe 3;

[0030] In this way, heat is generated by combustion in the boiler, which enters through the receiving bin 1 at the rear of the boiler, and then the amount of smoke in the receiving bins 1 at the rear of the two boilers is balanced through the circulation pipe 11. When the receiving bins 1 at the rear of the two boilers receive smoke, the solenoid switch valve 13 is activated. The solenoid switch valve 13 adopts the solenoid valve of the prior art, that is, electromagnetic induction is generated by powering on to realize the opening and closing of the valve, so as to control the exhaust flow rate of smoke in the receiving bins 1 of the two boilers to be the same. The working principle of the solenoid valve belongs to the prior art, so it will not be described in detail in this scheme.

[0031] When the two boiler receiving bins 1 discharge smoke at the same flow rate, the smoke needs to be processed in batches.

[0032] The interior of the processing body 2 is a cavity, and the design of the processing body 2 is as shown in the attached Figure 3 As shown in , a plurality of mounting grooves 21 are provided at equal angles on the treatment body 2, and an expansion capsule 22 is installed in the mounting groove 21, and a smoke inlet hole 23 aligned with the cavity is provided on the expansion capsule 22, and the plurality of expansion capsules 22 are connected through a telescopic tube 24, and a circulation member 6 is installed on the top of one of the expansion capsules 22, and one end of the circulation member 6 is connected to the hot air pipe 5, and the other end of the circulation member 6 is connected to the receiving bin 1 at the rear of the boiler;

[0033] A first smoke baffle 25 and a second smoke baffle 26 are provided in the processing body 2, the bottom of the second smoke baffle 26 is connected to the end of the first smoke baffle 25, and an adjusting member 7 is installed between the first smoke baffle 25 and the second smoke baffle 26, a rotating shaft 28 is provided in the middle of the first smoke baffle 25 and the second smoke baffle 26, and a temperature sensing probe 29 is installed on the rotating shaft 28. After the temperature sensing probe 29 detects a decrease in temperature, the adjusting member 7 drives the first smoke baffle 25 and the second smoke baffle 26 to rotate, thereby changing the flow direction of smoke in the processing body 2.

[0034] An inlet plug body 8 is provided inside the processing body 2, and the first smoke baffle 25 and the second smoke baffle 26 are installed outside the inlet plug body 8. A smoke port 81 is formed on the inlet plug body 8, and the smoke port 81 is inclinedly distributed.

[0035] Three expansion bladder bodies 22 are provided. The opening positions of the smoke inlet holes 23 on the expansion bladder bodies 22 are staggeredly distributed, and the center connection lines of the smoke inlet holes 23 are spirally distributed inside the processing body 2. The opening direction of the smoke port 81 is aligned with the smoke inlet hole 23 of the outermost expansion bladder body 22. The expansion bladder body 22 is trapezoidal in reverse, and the outer layer of the expansion bladder body 22 is a telescopic layer. The plurality of expansion bladder bodies 22 and the telescopic pipes 24 are combined into an annular body and distributed outside the processing body 2; different guiding intervals are formed inside the processing body 2, so as to gradually process the smoke and avoid excessive concentration of the smoke heat. After the smoke heat reaches the standard, it is discharged from the induced draft fan 4 through the hot air pipe 5. When the temperature does not reach the standard, the switching valve 66 is opened. At this time, the smoke passes through the circulation pipe 11 and is sent into the boiler tail receiving bin 1 for re-combustion in cooperation with the air blown by the blower 65, achieving the effect of recycling.

[0036] The first guiding plate 82, the second guiding plate 83 and the third guiding plate 84 are connected to the inlet plug body 8 at equal angles. The lengths of the first guiding plate 82, the second guiding plate 83 and the third guiding plate 84 increase in sequence. Expansion plates 85 are connected to both the first guiding plate 82 and the second guiding plate 83. Round holes 86 corresponding to the smoke inlet 81 are formed on the first guiding plate 82, the second guiding plate 83 and the third guiding plate 84, and telescopic arc segments 87 are provided at the connection positions of the first guiding plate 82, the second guiding plate 83, the third guiding plate 84 and the inlet plug body 8.

[0037] One end of the rotating shaft 28 of the second smoke baffle 26 is rotatably connected to the inner wall of the processing body 2, and the second smoke baffle 26 is connected to the first smoke baffle 25 through a bending rod 27. The first smoke baffle 25 and the first guiding plate 82 form a first channel, and the smoke enters the outermost expansion bladder body 22 from the first channel. The back surface of the first smoke baffle 25 and the second guiding plate 83 form a second channel, and the second smoke baffle 26 and the third guiding plate 84 form a third channel. The adjusting member 7 adjusts the positions of the first smoke baffle 25 and the second smoke baffle 26, so as to adjust the smoke intake of different channels.

[0038] After the smoke comes from the boiler tail receiving bin 1, when the sensor detects that the smoke concentrations in the two boiler tail receiving bins 1 are the same, the electromagnetic switching valve 13 is opened at this time, so as to discharge the two boiler tail receiving bins 1 with the same smoke concentration. When the smoke enters the smoke port 81 of the inlet plug body 8, due to the inclined design of the smoke port 81 and because the position of the smoke port 81 is aligned with the first guiding plate 82, as shown in the appendix Figure 6The first guide plate 82 is shown at the far left, the second guide plate 83 is at the far right, and the third guide plate 84 is at the top. The lengths of the guide plates are such that (the length of the first guide plate 82 < the length of the second guide plate 83 < the length of the third guide plate 84). Thus, the first guide plate 82 on the far left is the first to receive the smoke. After the smoke enters the smoke inlet 23, it is processed along the expansion bladder 22 on the far left. Since the expansion bladder 22 is filled with a solid medium, the first treatment can be carried out. When the smoke has been processed and the temperature probe 29 detects a temperature drop, the rotation rod 72 is rotated by the rotation motor 71 at this time, so that the driving gear 73 drives the driven gear 74 to rotate, and thus the two outer-facing surfaces of the first guide plate 82 towards the expansion bladder 22 start to rotate.

[0039] The adjusting member 7 includes a rotation motor 71 mounted on the inlet plug body 8. A rotation rod 72 is connected to the output shaft of the rotation motor 71. A driving gear 73 is connected to the top of the rotation rod 72. A driven gear 74 meshing with the driving gear 73 is connected to the rotation shaft 28 of the first smoke baffle 25. A rotation groove 75 is provided at the bottom of the driving gear 73, and a rotation block 76 is rotatably connected inside the rotation groove 75. A plurality of electric telescopic rods 77 are connected to the bottom of the rotation block 76, and the output ends of the plurality of electric telescopic rods 77 are connected to an adjusting gear 78. A mating gear 79 is connected to the rotation shaft 28 of the second smoke baffle 26. A tapered sleeve 781 is sleeved on the adjusting gear 78, and a tapered plug 782 cooperating with the tapered sleeve 781 is rotatably connected to the rotation rod 72.

[0040] The circulating member 6 includes a circulating receiver 61 provided at the top of the expansion bladder 22. A return pipe 62 connected to the boiler tail receiving bin 1 is connected to the circulating receiver 61, and a heating pipe 63 connected to the hot air pipe 5 is connected to the circulating receiver 61. A blower pipe 64 is communicated with the outside of the circulating receiver 61, and a blower 65 is connected to one end of the blower pipe 64.

[0041] During specific use: After the smoke comes from the boiler tail receiving bin 1, when the sensor detects that the smoke concentrations in the two boiler tail receiving bins 1 are the same, the electromagnetic switch valve 13 is opened at this time, so that the two boiler tail receiving bins 1 are discharged with the same smoke concentration. When the smoke enters the smoke port 81 of the inlet plug body 8, since the smoke port 81 is inclined and the position of the smoke port 81 is aligned with the first guide plate 82, as shown in the appendix Figure 6The first guide plate 82 is shown at the leftmost side in the figure, the second guide plate 83 is at the rightmost side, and the third guide plate 84 is at the top. The length of the guide plates is such that (the length of the first guide plate 82 < the length of the second guide plate 83 < the length of the third guide plate 84). Thus, the first guide plate 82 at the leftmost side receives the smoke first. After the smoke enters the smoke inlet 23, it is processed along the leftmost expansion bladder 22. Since the expansion bladder 22 is filled with a solid medium, the first treatment can be carried out in this way. When the smoke has been processed and the temperature probe 29 detects a temperature drop, at this time, the rotating motor 71 drives the rotating rod 72 to rotate, so that the driving gear 73 drives the driven gear 74 to rotate, and thus the two surfaces of the first guide plate 82 facing the two outermost expansion bladders 22 start to rotate. When, as shown in the appendix Figure 2 it rotates counterclockwise until the two surfaces of the first guide plate 82 just cover the positions of the two bottom expansion bladders 22. At this time, the processed smoke enters the rightmost expansion bladder 22 for processing. When the processing of the smoke inside the rightmost expansion bladder 22 is completed, at this time, the electric telescopic rod 77 extends towards the conical plug 782 until the conical plug 782 is inserted into the conical sleeve 781. At this time, the conical plug 782, the conical sleeve 781 and the adjustment gear 78 form a whole. The adjustment gear 78 meshes with the mating gear 79, so that the second guide plate 83 changes from covering the top smoke inlet 23 to the open state, and thus the smoke passes through the outermost expansion bladder 22, the innermost expansion bladder 22 and the top expansion bladder 22 for processing in sequence. By respectively setting the first guide plate 82 and the second guide plate 83, different guiding intervals are formed inside the processing body 2, so as to process the smoke step by step and avoid the over-concentration of the smoke heat. After the smoke heat reaches the standard, it is discharged from the induced draft fan 4 through the hot air pipe 5. When the temperature does not reach the standard, the switching valve 66 is opened. At this time, the smoke passes through the circulation pipe 11, and the air blown by the blower 65 is used to send the smoke into the boiler tail receiving bin 1 for re-combustion, achieving the effect of recycling.

[0042] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double flue gas duct structure at the tail of a secondary reheat boiler, comprising: It includes a group of boiler tail receiving bins (1), and the boiler tail receiving bins (1) are connected through a circulation pipe (11). It is characterized in that it further includes: an installation pipe (12) is connected to the boiler tail receiving bin (1), an electromagnetic switch valve (13) is arranged at the connection between the boiler tail receiving bin (1) and the installation pipe (12), and one end of the installation pipe (12) is connected to a treatment body (2). One end of the treatment body (2) is communicated with a flue pipe (3), the tail of the flue pipe (3) is communicated with an induced draft fan (4) for exhausting smoke, and a hot air pipe (5) is installed on the flue pipe (3). The inside of the treatment body (2) is a cavity, and a plurality of installation grooves (21) are equiangularly opened on the treatment body (2), and expansion bladder bodies (22) are installed in the installation grooves (21). Smoke inlet holes (23) facing the cavity are opened on the expansion bladder bodies (22). The plurality of expansion bladder bodies (22) are communicated through a telescopic pipe (24). A circulation member (6) is installed at the top of one of the expansion bladder bodies (22). A switch valve (66) is arranged at the connection between one end of the circulation member (6) and the hot air pipe (5), and the other end of the circulation member (6) is communicated with the boiler tail receiving bin (1). A first smoke baffle (25) and a second smoke baffle (26) are arranged in the treatment body (2). The bottom of the second smoke baffle (26) is connected to the end of the first smoke baffle (25), and an adjustment member (7) is installed between the first smoke baffle (25) and the second smoke baffle (26). A rotating shaft (28) is arranged between the first smoke baffle (25) and the second smoke baffle (26), and a temperature sensing probe (29) is installed on the rotating shaft (28). After the temperature detected by the temperature sensing probe (29) decreases, the adjustment member (7) drives the first smoke baffle (25) and the second smoke baffle (26) to rotate, changing the flow direction of the smoke in the treatment body (2).

2. The double flue duct structure at the tail of a secondary reheat boiler according to claim 1, wherein: Solid medium is filled in the expansion bladder body (22). An inlet plug body (8) is arranged inside the treatment body (2), and the first smoke baffle (25) and the second smoke baffle (26) are installed outside the inlet plug body (8). A smoke port (81) is opened on the inlet plug body (8), and the smoke port (81) is inclinedly distributed.

3. A double flue gas duct structure at the tail of a secondary reheat boiler according to claim 2, characterized in that: Three expansion bladder bodies (22) are provided. The opening positions of the smoke inlet holes (23) on the expansion bladder bodies (22) are staggeredly distributed, and the connecting lines of the centers of the smoke inlet holes (23) are spirally distributed inside the treatment body (2). The opening direction of the smoke port (81) is aligned with the smoke inlet hole (23) of the outermost expansion bladder body (22).

4. A double flue gas duct structure at the tail of a secondary reheat boiler according to claim 2, characterized in that: On the entrance plug body (8), a first guiding plate (82), a second guiding plate (83) and a third guiding plate (84) are connected at equal angles. The lengths of the first guiding plate (82), the second guiding plate (83) and the third guiding plate (84) increase in sequence. Expansion plates (85) are connected to both the first guiding plate (82) and the second guiding plate (83). Round holes (86) corresponding to the smoke inlet (81) are formed on the first guiding plate (82), the second guiding plate (83) and the third guiding plate (84), and telescopic arc-shaped sections (87) are provided at the connection between the first guiding plate (82), the second guiding plate (83), the third guiding plate (84) and the entrance plug body (8).

5. A double flue gas duct structure at the tail of a secondary reheat boiler according to claim 4, characterized in that: One end of the rotating shaft (28) of the second smoke baffle (26) is rotatably connected to the inner wall of the processing body (2), and the second smoke baffle (26) is connected to the first smoke baffle (25) through a bending rod (27). The first smoke baffle (25) and the first guiding plate (82) form a first channel. Smoke enters the outermost expansion bladder (22) from the first channel. The back surface of the first smoke baffle (25) and the second guiding plate (83) form a second channel. The second smoke baffle (26) and the third guiding plate (84) form a third channel. The adjusting member (7) adjusts the positions of the first smoke baffle (25) and the second smoke baffle (26), thereby adjusting the smoke intake of different channels.

6. A double flue gas duct structure at the tail of a secondary reheat boiler according to claim 5, characterized in that: The adjusting member (7) includes a rotating motor (71) installed on the entrance plug body (8). A rotating rod (72) is connected to the output shaft of the rotating motor (71). A driving gear (73) is connected to the top of the rotating rod (72). A driven gear (74) meshing with the driving gear (73) is connected to the rotating shaft (28) of the first smoke baffle (25). A rotating groove (75) is provided at the bottom of the driving gear (73), and a rotating block (76) is rotatably connected inside the rotating groove (75). A plurality of electric telescopic rods (77) are connected to the bottom of the rotating block (76), and an adjusting gear (78) is connected to the output ends of the plurality of electric telescopic rods (77). A mating gear (79) is connected to the rotating shaft (28) of the second smoke baffle (26). A conical sleeve (781) is sleeved on the adjusting gear (78), and a conical plug block (782) cooperating with the conical sleeve (781) is rotatably connected to the rotating rod (72).

7. A double flue gas duct structure at the tail of a secondary reheat boiler according to claim 1, characterized in that: The circulating member (6) includes a circulating receiver (61) provided at the top of the expansion bladder (22). A return pipe (62) communicating with the boiler tail receiving bin (1) is connected to the circulating receiver (61), and a heating pipe (63) communicating with the hot air pipe (5) is connected to the circulating receiver (61). A blower pipe (64) is externally connected to the circulating receiver (61), and a blower (65) is connected to one end of the blower pipe (64).

8. A double flue structure at the tail of a secondary reheat boiler according to claim 1, characterized in that: The expansion bladder (22) is trapezoidal in reverse, and the outer layer of the expansion bladder (22) is a telescopic layer. The plurality of expansion bladders (22) and the telescopic pipe (24) form a ring and are distributed outside the processing body (2).

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