Thermal power plant boiler flue gas waste heat recycling system

Abstract

The invention relates to a thermal power plant boiler flue gas waste heat recycling system, and belongs to the technical field of boiler flue gas waste heat recycling. The flue gas waste heat recycling system for the boiler of the thermal power plant comprises a smoke exhaust pipe; a cleaning module and a heat exchange assembly are sequentially arranged in the smoke exhaust pipe in the smoke inlet direction. According to the flue gas treatment device, flue gas can be treated in a centralized mode under the action of the cleaning module, heat loss can be reduced in the treatment process, follow-up heat exchange operation is facilitated, and smoke dust in the cleaned flue gas can be intercepted in a connecting ring and independently discharged through a discharging structure; flue gas flows to drive a driving blade to enable a rotating ring to rotate, then a rotating shaft is driven to enable a second spiral conveying plate to rotate, smoke dust guided into a fixing pipe is conveyed and discharged, the cleaning difficulty is reduced, meanwhile, the smoke dust adhering to the surface of the driving blade can be cleaned under the combined action of a knocking ball, a mounting rod, the rotating shaft and a clockwork spring, and the practicability is high. And the cleaning effect is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler flue gas waste heat recovery and utilization, and in particular to a boiler flue gas waste heat recovery and utilization system for a thermal power plant. Background Art

[0002] At present, in order to make full use of the waste heat in the flue gas of the boiler of a thermal power plant, multiple heat exchangers are generally connected in series in the boiler flue gas channel. The heat obtained by heat exchange is used to heat the boiler feed water of the heat recovery system, thereby reducing steam extraction, or heating the air entering the boiler to improve the boiler efficiency. Due to the large specific heat capacity of water, the recovery effect of heating water using a heat exchanger is the best.

[0003] For example, a Chinese utility model patent (CN 117006458 B) discloses a waste heat recovery system for flue gas from a thermal power plant boiler. The flue gas generated by combustion in the thermal power plant boiler enters the boiler chimney and is then discharged from the top of the conical flue. The high-temperature flue gas entering the boiler chimney first enters the spiral flue and then spirals up. The high-temperature flue gas heats the spiral blades. The heat conduction of the spiral blades is used to heat the water flow in the spiral water channel to achieve heat exchange of the water and utilize the waste heat in the flue gas. External cold water enters the bottom of the spiral water channel through a heat exchange inlet pipe and is then gradually heated and heated along the spiral water channel. In a limited space, the heat exchange area between water and flue gas is large, the heat exchange time is long, and the heat exchange efficiency is high.

[0004] However, after long-term use, the smoke in the flue gas of the thermal power plant will adhere to the surface of the heat exchange tube, affecting the heat exchange effect of the heat exchange tube and reducing the heat exchange efficiency. Summary of the invention

[0005] Based on this, it is necessary to provide a thermal power plant boiler flue gas waste heat recovery and utilization system to address the problem that smoke dust in the flue gas of a thermal power plant will adhere to the surface of the heat exchange tube, affect the heat exchange effect of the heat exchange tube, and reduce the heat exchange efficiency.

[0006] A system for recovering waste heat from flue gas of a thermal power plant boiler, comprising:

[0007] exhaust pipe;

[0008] The interior of the smoke exhaust pipe is provided with a cleaning module and a heat exchange component in sequence along the smoke inlet direction;

[0009] The cleaning module includes a dust removal structure and an exhaust structure, wherein the dust removal structure is arranged inside the smoke exhaust pipe, and the exhaust structure is used to exhaust the smoke and dust intercepted by the dust removal structure;

[0010] Among them, the dust removal structure includes a connecting block fixedly connected to the inside of the smoke exhaust pipe, an installation cavity is opened inside the connecting block, an inlet groove for introducing smoke and connected to the installation cavity is opened on one side of the connecting block, a discharge shell connected to the installation cavity is arranged on the other side of the connecting block, the other end of the discharge shell is connected to a guide shell, the cross-section of the guide shell is funnel-shaped, and a guide slope is arranged on the side of the connecting block where the inlet groove is opened.

[0011] In one of the embodiments, two symmetrically distributed mounting plates are fixedly connected to the inner wall of the mounting cavity, a connecting ring is fixedly connected between the two mounting plates, an inlet connected to the inlet groove is provided on the surface of the connecting ring, and evenly distributed second filter holes are provided on the surface of the connecting ring. The area where the connecting ring is provided with the second filter holes forms an exhaust zone, and the exhaust zone is connected to the exhaust shell.

[0012] In one of the embodiments, a mounting ring located on the inner side of the connecting ring is fixedly connected between the two mounting plates, a rotating ring is rotatably connected to the outer side of the mounting ring, driving blades that are evenly distributed and in contact with the inner side of the connecting ring are fixedly connected to the outer side of the rotating ring, a rotating plate is fixedly connected to one end of the rotating ring, and the rotating plate is rotatably connected to the surface of the adjacent mounting plate.

[0013] In one of the embodiments, the surface of the mounting ring is fixedly connected with uniformly distributed introduction shells, and the surface of the rotating ring is provided with through grooves staggered with the driving blades, and the through grooves match with an opening at one end of the introduction shells.

[0014] In one of the embodiments, the exhaust structure includes a fixed tube arranged on the surface of the smoke exhaust pipe, one end of the fixed tube sequentially passes through the smoke exhaust pipe, a connecting block, one of the mounting plates, a mounting ring and is fixedly connected to the surface of another mounting plate, the inner wall of the fixed tube is rotatably connected to a rotating shaft, the surface of the rotating shaft is fixedly connected to a second spiral conveying plate, one end of the rotating shaft is fixedly connected to the center of the rotating plate, and the surface of the smoke exhaust pipe is connected to a dust exhaust pipe.

[0015] In one of the embodiments, an introduction hole matching the introduction shell is opened on the surface of the fixed tube, and the other end of the introduction shell extends to the inside of the introduction hole.

[0016] In one embodiment, the other end of the fixed tube is fixedly connected to a protective shell, the inner top wall of the protective shell is provided with a mounting shaft, the lower end of the mounting shaft is fixedly connected to the second cone wheel, the other end of the rotating shaft passes through the fixed tube and is fixedly connected to the first cone wheel, the first cone wheel is meshingly connected with the second cone wheel, and the upper end of the mounting shaft passes through the protective shell and is provided with a transmission mechanism.

[0017] In one embodiment, the inner wall of the connecting ring is provided with evenly distributed storage cavities, the inner wall of the storage cavity is rotatably connected to a rotating shaft, both end surfaces of the rotating shaft are fixedly connected to a spring, the other end of the spring is fixedly connected to the inner wall of the storage cavity, the surface of the rotating shaft is fixedly connected to a mounting rod, and the other end of the mounting rod is fixedly connected to a knocking ball in contact with the surface of the driving blade.

[0018] In one of the embodiments, the heat exchange assembly includes two water guiding rings fixedly connected to the surface of the smoke exhaust pipe, the surfaces of the two water guiding rings are respectively connected to a water inlet pipe and a water outlet pipe, and the inner side of the smoke exhaust pipe is provided with evenly distributed heat exchange tubes, the two ends of the heat exchange tubes are respectively connected to the interior of the two water guiding rings, and the middle part of the heat exchange tubes is arranged in a spiral shape.

[0019] In one of the embodiments, the heat exchange component also includes a connecting shell arranged on one side of the smoke exhaust pipe, the inner top wall of the connecting shell is fixedly connected to a mounting shell, the surface of the mounting shell is provided with evenly distributed first filter holes, the bottom of the connecting shell is connected to a return pipe, the inner bottom wall of the mounting shell is rotatably connected to a connecting shaft, the surface of the connecting shaft is fixedly connected to a first spiral conveying plate, the upper end of the connecting shaft passes through the connecting shell and is fixedly connected to the other end of the transmission mechanism, the other end of the water outlet pipe is connected to the mounting shell, and the surface of the mounting shell is connected to a slag discharge pipe.

[0020] The above-mentioned thermal power plant boiler flue gas waste heat recovery and utilization system can centrally treat the flue gas under the action of the cleaning module. During the treatment process, it can reduce heat loss and facilitate subsequent heat exchange operations. The smoke dust in the cleaned flue gas can be trapped inside the connecting ring and discharged separately through the discharge structure. The flow of smoke is used to drive the driving blade to rotate the rotating ring and then drive the rotating shaft to rotate the second spiral conveying plate, thereby realizing the transportation and discharge of the smoke dust introduced into the fixed tube, reducing the difficulty of cleaning. At the same time, the smoke dust adhered to the surface of the driving blade can be cleaned under the joint action of the knocking ball, the mounting rod, the rotating shaft and the spring, effectively improving the cleaning effect.

[0021] During the heating process, scale crystals are easily formed in the water. Under the action of water flow, the scale crystals are introduced into the interior of the installation shell and retained in the interior of the installation shell through the first filter holes. Under the action of the transmission mechanism, the connecting shaft can be driven to rotate, thereby driving the first spiral conveyor plate to rotate. In this process, the scale impurities retained in the interior of the installation shell can be lifted and discharged through the slag discharge pipe, reducing the residual scale crystals to improve the quality of hot water supply in the plant area, while avoiding the situation where a large amount of scale crystals form scale inside the heat exchange tube and affect heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a partial cross-sectional view of the present invention;

[0025] Figure 3 It is a partial schematic diagram of the cleaning module of the present invention;

[0026] Figure 4 This is a schematic diagram of the distribution of the driving blades and the through slots of the present invention;

[0027] Figure 5 It is a schematic diagram of the connection between the discharge structure and the transmission mechanism of the present invention;

[0028] Figure 6 It is a schematic diagram of the connection between the mainspring, the rotating shaft, the mounting rod and the striking ball of the present invention;

[0029] Figure 7 Schematic diagram of the distribution of heat exchange tubes of the present invention;

[0030] Figure 8 It is a connection schematic diagram of the mounting shell and the connecting shell of the present invention.

[0031] Reference numerals:

[0032] 1. Exhaust pipe; 2. Heat exchange assembly; 201. Water guide ring; 202. Water inlet pipe; 203. Water outlet pipe; 204. Heat exchange pipe; 205. Connecting shell; 206. Slag discharge pipe; 207. First filter hole; 208. Return pipe; 209. Mounting shell; 210. Connecting shaft; 211. First spiral conveyor plate; 3. Cleaning module; 301. Connecting block; 302. Introducing slot; 303. Mounting cavity; 304. Exhaust shell; 305. Guide shell; 306. Guide Inclined surface; 307, mounting plate; 308, connecting ring; 309, second filter hole; 310, mounting ring; 311, rotating shaft; 312, driving blade; 313, introduction shell; 314, through groove; 315, second spiral conveying plate; 316, clockwork; 317, rotating shaft; 318, mounting rod; 319, knocking ball; 320, fixing tube; 321, introduction hole; 322, transmission mechanism; 323, first cone wheel; 324, second cone wheel; 325, protective shell. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] Unless otherwise defined, all technical and scientific terms used in the specification of the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the specification of the present invention includes any and all combinations of one or more related listed items.

[0038] Combine the following Figure 1-Figure 8 The invention describes a system for recovering and utilizing waste heat from flue gas in a thermal power plant boiler.

[0039] like Figure 1-Figure 8 As shown, in one embodiment, a system for recovering waste heat from flue gas of a thermal power plant boiler comprises:

[0040] Smoke exhaust pipe 1;

[0041] The interior of the smoke exhaust pipe 1 is provided with a cleaning module 3 and a heat exchange component 2 in sequence along the smoke inlet direction;

[0042] The cleaning module 3 includes a dust removal structure and an exhaust structure. The dust removal structure is arranged inside the smoke exhaust pipe 1, and the exhaust structure is used to discharge the smoke trapped by the dust removal structure.

[0043] Among them, the dust removal structure includes a connecting block 301 fixedly connected to the inside of the smoke exhaust pipe 1, an installation cavity 303 is opened inside the connecting block 301, an inlet groove 302 for introducing smoke and connected to the installation cavity 303 is opened on one side of the connecting block 301, and an exhaust shell 304 connected to the installation cavity 303 is arranged on the other side of the connecting block 301, and the other end of the exhaust shell 304 is connected to a guide shell 305, and the cross-sectional shape of the guide shell 305 is funnel-shaped, and a guide slope 306 is arranged on the side of the connecting block 301 where the inlet groove 302 is opened.

[0044] After the smoke enters the smoke exhaust pipe 1, it can be introduced into the installation cavity 303 through the introduction groove 302. The smoke treated by the dust removal structure can be discharged through the exhaust shell 304 and the guide shell 305. The setting of the introduction groove 302 and the guide slope 306 can make the smoke enter the installation cavity 303 more concentrated and strengthen the wind force, and at the same time concentrate the heat to avoid heat waste. The exhaust shell 304 and the guide shell 305 can make the subsequent exhaust smoke evenly diffuse to the rear section of the smoke exhaust pipe 1, and cooperate with the heat exchange component 2 to make it absorb heat more fully, thereby improving the utilization rate of waste heat.

[0045] like Figure 1-Figure 8 As shown, two symmetrically distributed mounting plates 307 are fixedly connected to the inner wall of the mounting cavity 303, a connecting ring 308 is fixedly connected between the two mounting plates 307, an inlet connected to the inlet groove 302 is provided on the surface of the connecting ring 308, and evenly distributed second filter holes 309 are provided on the surface of the connecting ring 308. The area where the second filter holes 309 are provided on the connecting ring 308 forms an exhaust zone, and the exhaust zone is connected to the exhaust shell 304.

[0046] A mounting ring 310 located on the inner side of the connecting ring 308 is fixedly connected between the two mounting plates 307, a rotating ring is rotatably connected to the outer side of the mounting ring 310, driving blades 312 that are evenly distributed and in contact with the inner side of the connecting ring 308 are fixedly connected to the outer side of the rotating ring, a rotating plate is fixedly connected to one end of the rotating ring, and the rotating plate is rotatably connected to the surface of the adjacent mounting plate 307.

[0047] The surface of the mounting ring 310 is fixedly connected with uniformly distributed introduction shells 313 , and the surface of the rotating ring is provided with through grooves 314 staggered with the driving blades 312 , and the through grooves 314 match with one end opening of the introduction shells 313 .

[0048] In the process of introducing the flue gas through the introduction groove 302, it can be guided to the inner side of the connecting ring 308 under the action of the introduction port. As the flue gas from the thermal power station is continuously introduced into the interior of the smoke exhaust pipe 1 through the induced draft fan, the flue gas can flow continuously, so that after entering the inner side of the connecting ring 308, it can push the driving blade 312 to rotate, so that the driving blade 312 can drive the rotating ring to rotate. In this process, the smoke dust can hit the surface of the driving blade 312 and be trapped, thereby achieving preliminary separation of the smoke dust. The second filter hole 309 can be used to further trap the smoke dust, so that the smoke dust is trapped on the inner side of the connecting ring 308, and the treated smoke is discharged through the exhaust area and the exhaust shell 304, and the driving blade 312 drives the rotating ring to rotate, which can drive the smoke dust to move gradually until the introduction shell 313 and the through groove 314 are connected. At this time, since the smoke is discharged through the exhaust area, this area will not be affected by the airflow, so that the smoke dust can be discharged through the through groove 314 and the introduction shell 313 under the action of gravity, reducing the influence of the smoke dust on subsequent heat exchange.

[0049] like Figure 1-Figure 8 As shown, the exhaust structure includes a fixed tube 320 arranged on the surface of the smoke exhaust pipe 1, one end of the fixed tube 320 passes through the smoke exhaust pipe 1, the connecting block 301, one of the mounting plates 307, the mounting ring 310 in sequence and is fixedly connected to the surface of the other mounting plate 307, the inner wall of the fixed tube 320 is rotatably connected to a rotating shaft 311, the surface of the rotating shaft 311 is fixedly connected to a second spiral conveying plate 315, one end of the rotating shaft 311 is fixedly connected to the center of the rotating plate, and the surface of the smoke exhaust pipe 1 is connected to a dust exhaust pipe.

[0050] An introduction hole 321 matching the introduction shell 313 is formed on the surface of the fixed tube 320 , and the other end of the introduction shell 313 extends to the inside of the introduction hole 321 .

[0051] The other end of the fixed tube 320 is fixedly connected to a protective shell 325, the inner top wall of the protective shell 325 is provided with a mounting shaft, the lower end of the mounting shaft is fixedly connected to the second cone wheel 324, the other end of the rotating shaft 311 passes through the fixed tube 320 and is fixedly connected to the first cone wheel 323, the first cone wheel 323 is meshed with the second cone wheel 324, and the upper end of the mounting shaft passes through the protective shell 325 and is provided with a transmission mechanism 322.

[0052] During the rotation of the rotating ring, the rotating plate can be driven to rotate synchronously, thereby driving the rotating shaft 311 to rotate. The smoke discharged through the inlet shell 313 can fall into the interior of the fixed pipe 320 under the action of gravity. During this process, the second spiral conveying plate 315 can be driven to rotate by the rotating shaft 311 to achieve the effect of driving the smoke inside the fixed pipe 320 to be transported along the fixed pipe 320, and finally discharged through the dust exhaust pipe. At the same time, during the rotation of the rotating shaft 311, the first cone wheel 323 and the second cone wheel 324 can be driven to rotate synchronously, thereby driving the transmission mechanism 322 to work. The transmission mechanism 322 is a relatively mature component in the prior art application, which is composed of two transmission wheels and a transmission belt. By driving one of the transmission wheels to rotate, the other transmission wheel can be driven to rotate synchronously under the action of the transmission belt.

[0053] like Figure 1-Figure 8 As shown, the inner wall of the connecting ring 308 is provided with evenly distributed storage cavities, the inner wall of the storage cavity is rotatably connected with a rotating shaft 317, the two end surfaces of the rotating shaft 317 are fixedly connected with a spring 316, the other end of the spring 316 is fixedly connected to the inner wall of the storage cavity, the surface of the rotating shaft 317 is fixedly connected with a mounting rod 318, and the other end of the mounting rod 318 is fixedly connected with a knocking ball 319 in contact with the surface of the driving blade 312.

[0054] During the process of the driving blade 312 rotating along the inner side of the connecting ring 308, the driving blade 312 can push the knocking ball 319 to mobilize the mounting rod 318 to rotate around the rotating shaft 317. During this process, the spring 316 is tightened and the knocking ball 319 is retracted to the inside of the storage cavity until the driving blade 312 is separated from the knocking ball 319 and the knocking ball 319 is reset through the rotating shaft 317 and the mounting rod 318 under the action of the spring 316 to knock on the surface of the next driving blade 312, so that the smoke and dust adhering to the surface falls off, which is convenient for subsequent discharge.

[0055] like Figure 1-Figure 8 As shown, the heat exchange component 2 includes two water guide rings 201 fixedly connected to the surface of the smoke exhaust pipe 1, and the surfaces of the two water guide rings 201 are respectively connected to the water inlet pipe 202 and the water outlet pipe 203. The inner side of the smoke exhaust pipe 1 is provided with evenly distributed heat exchange tubes 204, and the two ends of the heat exchange tubes 204 are respectively connected to the interior of the two water guide rings 201, and the middle part of the heat exchange tubes 204 is spirally arranged.

[0056] The heat exchange component 2 also includes a connecting shell 205 arranged on one side of the smoke exhaust pipe 1, the inner top wall of the connecting shell 205 is fixedly connected to a mounting shell 209, the surface of the mounting shell 209 is provided with uniformly distributed first filter holes 207, the bottom of the connecting shell 205 is connected to a return pipe 208, the inner bottom wall of the mounting shell 209 is rotatably connected to a connecting shaft 210, the surface of the connecting shaft 210 is fixedly connected to a first spiral conveying plate 211, the upper end of the connecting shaft 210 passes through the connecting shell 205 and is fixedly connected to the other end of the transmission mechanism 322, the other end of the water outlet pipe 203 is connected to the mounting shell 209, and the surface of the mounting shell 209 is connected to a slag discharge pipe 206;

[0057] The water inlet pipe 202 is used to introduce water into the interior of the water guide ring 201 connected to it, and introduce it into the interior of another water guide ring 201 through the heat exchange tube 204, and then introduce it into the interior of the installation shell 209 through the water outlet pipe 203. During this process, the heat exchange tube 204 can absorb the waste heat in the flue gas for heating, thereby realizing the recovery and utilization of the waste heat. During the heating process, scale crystals are easily formed in the water. Under the action of the water flow, the scale crystals are introduced into the interior of the installation shell 209 and retained in the interior of the installation shell 209 through the first filter hole 207, while the water can be introduced into the interior of the connecting shell 205 through the first filter hole 207 and discharged through the return pipe 208 for hot water supply or other uses in the factory area.

[0058] The transmission mechanism 322 can drive the connecting shaft 210 to rotate, thereby driving the first spiral conveying plate 211 to rotate. During this process, the scale impurities trapped inside the installation shell 209 can be lifted and discharged through the slag discharge pipe 206.

[0059] Working principle: after the smoke enters the smoke exhaust pipe 1, it can be introduced into the installation cavity 303 through the introduction groove 302. After being processed by the dust removal structure, the smoke can be discharged through the exhaust shell 304 and the guide shell 305. The setting of the introduction groove 302 and the guide slope 306 can make the smoke enter the installation cavity 303 in a more concentrated way to strengthen the wind force, and at the same time concentrate the heat to avoid heat waste. Through the exhaust shell 304 and the guide shell 305, the subsequent exhaust smoke can be evenly diffused to the rear section of the smoke exhaust pipe 1, and the heat exchange component 2 can make it absorb heat more fully, thereby improving the utilization rate of waste heat. On this basis, the smoke can be guided to the inside of the connecting ring 308 under the action of the introduction port during the process of being introduced through the introduction groove 302. As the smoke from the thermal power station is continuously introduced into the smoke exhaust pipe 1 through the induced draft fan, the smoke can continue to flow, so that after entering the inside of the connecting ring 308, it can The driving blade 312 can be pushed to rotate, so that the driving blade 312 can drive the rotating ring to rotate. In this process, the smoke can hit the surface of the driving blade 312 and be trapped, thereby achieving preliminary separation of the smoke. The second filter hole 309 can be used to further trap the smoke, so that the smoke is trapped on the inner side of the connecting ring 308, and the treated smoke is discharged through the exhaust area and the exhaust shell 304. Under the action of the driving blade 312 driving the rotating ring to rotate, the smoke can be driven to move gradually until the connecting part of the introduction shell 313 and the through groove 314 is moved. At this time, since the smoke is discharged through the exhaust area, this area will not be affected by the airflow, so that the smoke can be discharged through the through groove 314 and the introduction shell 313 under the action of gravity, reducing the influence of the smoke on the subsequent heat exchange, and can effectively prevent the smoke from adhering to the surface of the heat exchange tube 204 and affecting the heat absorption of the heat exchange tube 204, thereby effectively improving the heat absorption effect of the heat exchange tube 204.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A system for recovering waste heat from flue gas of a thermal power plant boiler, characterized in that: include: Smoke exhaust pipe (1); The interior of the smoke exhaust pipe (1) is provided with a cleaning module (3) and a heat exchange component (2) in sequence along the smoke inlet direction; The cleaning module (3) comprises a dust removal structure and a discharge structure, wherein the dust removal structure is arranged inside the smoke exhaust pipe (1), and the discharge structure is used to discharge smoke and dust trapped by the dust removal structure; The dust removal structure comprises a connection block (301) fixedly connected to the inside of the smoke exhaust pipe (1); a mounting cavity (303) is provided inside the connection block (301); an introduction groove (302) for introducing smoke and communicating with the installation cavity (303) is provided on one side of the connection block (301); a discharge shell (304) communicating with the installation cavity (303) is provided on the other side of the connection block (301); the other end of the discharge shell (304) is communicated with a guide shell (305); the cross-section of the guide shell (305) is funnel-shaped; and a guide slope (306) is provided on one side of the connection block (301) on which the introduction groove (302) is provided.

2. The system for recovering waste heat from flue gas from a thermal power plant boiler according to claim 1, characterized in that: The inner wall of the installation cavity (303) is fixedly connected with two symmetrically distributed installation plates (307), a connecting ring (308) is fixedly connected between the two installation plates (307), a surface of the connecting ring (308) is provided with an inlet connected to the inlet groove (302), a surface of the connecting ring (308) is provided with evenly distributed second filter holes (309), the area of ​​the connecting ring (308) provided with the second filter holes (309) forms an exhaust area, and the exhaust area is connected to the exhaust shell (304).

3. The system for recovering waste heat from flue gas from a thermal power plant boiler according to claim 2, characterized in that: A mounting ring (310) located on the inner side of the connecting ring (308) is fixedly connected between the two mounting plates (307); a rotating ring is rotatably connected to the outer side of the mounting ring (310); driving blades (312) that are evenly distributed and in contact with the inner side of the connecting ring (308) are fixedly connected to the outer side of the rotating ring; a rotating plate is fixedly connected to one end of the rotating ring; and the rotating plate is rotatably connected to the surface of the adjacent mounting plate (307).

4. The system for recovering waste heat from flue gas from a thermal power plant boiler according to claim 3, characterized in that: The surface of the mounting ring (310) is fixedly connected with uniformly distributed introduction shells (313), and the surface of the rotating ring is provided with through grooves (314) staggered with the driving blades (312), and the through grooves (314) match with an opening at one end of the introduction shell (313).

5. The system for recovering waste heat from flue gas from a thermal power plant boiler according to claim 4, characterized in that: The exhaust structure comprises a fixed pipe (320) arranged on the surface of the smoke exhaust pipe (1); one end of the fixed pipe (320) passes through the smoke exhaust pipe (1), the connecting block (301), one of the mounting plates (307), the mounting ring (310) in sequence, and is fixedly connected to the surface of another mounting plate (307); the inner wall of the fixed pipe (320) is rotatably connected to a rotating shaft (311); the surface of the rotating shaft (311) is fixedly connected to a second spiral conveying plate (315); one end of the rotating shaft (311) is fixedly connected to the center of the rotating plate; and the surface of the smoke exhaust pipe (1) is connected to a dust exhaust pipe.

6. The system for recovering waste heat from flue gas of a thermal power plant boiler according to claim 5, characterized in that: An introduction hole (321) matching the introduction shell (313) is provided on the surface of the fixed tube (320), and the other end of the introduction shell (313) extends to the inside of the introduction hole (321).

7. The system for recovering waste heat from flue gas of a thermal power plant boiler according to claim 6, characterized in that: The other end of the fixed tube (320) is fixedly connected to a protective shell (325), the inner top wall of the protective shell (325) is provided with a mounting shaft, the lower end of the mounting shaft is fixedly connected to a second cone wheel (324), the other end of the rotating shaft (311) passes through the fixed tube (320) and is fixedly connected to a first cone wheel (323), the first cone wheel (323) is meshedly connected with the second cone wheel (324), and the upper end of the mounting shaft passes through the protective shell (325) and is provided with a transmission mechanism (322).

8. The system for recovering waste heat from flue gas of a thermal power plant boiler according to claim 3, characterized in that: The inner wall of the connecting ring (308) is provided with evenly distributed storage cavities, the inner wall of the storage cavity is rotatably connected to a rotating shaft (317), both end surfaces of the rotating shaft (317) are fixedly connected to a spring (316), the other end of the spring (316) is fixedly connected to the inner wall of the storage cavity, the surface of the rotating shaft (317) is fixedly connected to a mounting rod (318), and the other end of the mounting rod (318) is fixedly connected to a striking ball (319) in contact with the surface of the driving blade (312).

9. The system for recovering waste heat from flue gas from a thermal power plant boiler according to claim 7, characterized in that: The heat exchange assembly (2) comprises two water guide rings (201) fixedly connected to the surface of the smoke exhaust pipe (1), the surfaces of the two water guide rings (201) being respectively connected to a water inlet pipe (202) and a water outlet pipe (203), and evenly distributed heat exchange tubes (204) are arranged on the inner side of the smoke exhaust pipe (1), the two ends of the heat exchange tubes (204) being respectively connected to the inside of the two water guide rings (201), and the middle part of the heat exchange tubes (204) being arranged in a spiral shape.

10. The system for recovering waste heat from flue gas of a thermal power plant boiler according to claim 9, characterized in that: The heat exchange component (2) further comprises a connecting shell (205) arranged on one side of the smoke exhaust pipe (1); the inner top wall of the connecting shell (205) is fixedly connected to a mounting shell (209); the surface of the mounting shell (209) is provided with evenly distributed first filter holes (207); the bottom of the connecting shell (205) is connected to a return pipe (208); the inner bottom wall of the mounting shell (209) is rotatably connected to a connecting shaft (210); the surface of the connecting shaft (210) is fixedly connected to a first spiral conveying plate (211); the upper end of the connecting shaft (210) passes through the connecting shell (205) and is fixedly connected to the other end of the transmission mechanism (322); the other end of the water outlet pipe (203) is connected to the mounting shell (209); and the surface of the mounting shell (209) is connected to a slag discharge pipe (206).

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