A circulating fluidized bed boiler

Abstract

The utility model relates to a kind of circulating fluidized bed boilers, including hearth, dust collector, ash bucket, first sealing mechanism, second sealing mechanism, recovery pipeline and power mechanism;The dust collector with the hearth is connected by pipeline, and the dust collector is used to remove dust in flue gas;The ash bucket is set to the dust collector below;The recovery pipeline one end with the ash bucket is connected by the first sealing mechanism, and the recovery pipeline other end with the hearth is connected by the second sealing mechanism;The power mechanism is set to the recovery pipeline, and the power mechanism is used to transport the ash in the ash bucket to hearth by recovery pipeline.Wherein by being provided with first sealing mechanism and second sealing mechanism, recovery pipeline and ash bucket, hearth junction play sealing effect, greatly enhance the sealing property of recovery pipeline and ash bucket, hearth junction, avoid fly ash leakage, improve working environment, avoid resource waste, avoid pollution environment.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, and in particular to a circulating fluidized bed boiler. Background Technology

[0002] A fluidized bed boiler is a boiler that uses fluidized bed combustion. According to its fluid dynamic characteristics, fluidized bed boilers can be divided into bubbling fluidized bed boilers and circulating fluidized bed boilers. According to the flue gas pressure in the furnace, fluidized bed boilers can be divided into atmospheric pressure fluidized bed boilers and pressurized fluidized bed boilers. Flueized bed boilers use under-bed ignition and staged combustion, converting the energy generated by burning materials into other required forces.

[0003] During maintenance of circulating fluidized bed boilers, the return ash from the return material system needs to be discharged and cleaned. Upon restarting after maintenance, the lack of return ash and high oxygen levels cause difficulties in load control, resulting in excessively high boiler bed temperatures reaching 1040℃, causing significant disruption to production.

[0004] Currently, the solution to insufficient return ash after maintenance is to transport ash from the ash hopper to the furnace through ash conveying pipes to replenish the return circulating ash and ensure that the return circulating ash in the circulating fluidized bed boiler reaches the normal ash quantity. However, in the existing technology, the connection between the ash conveying pipe and the furnace and ash hopper has poor sealing, which can easily lead to ash leakage, polluting the environment, wasting resources, and affecting the normal operating efficiency of the boiler. Summary of the Invention

[0005] Therefore, there is a need to provide a circulating fluidized bed boiler to solve the technical problem in the existing technology where the connection between the ash conveying pipe and the furnace and ash hopper is poorly sealed, which easily leads to ash leakage, polluting the environment, wasting resources, and affecting the normal operation efficiency of the boiler.

[0006] To achieve the above objectives, the inventors provide a circulating fluidized bed boiler, comprising:

[0007] Furnace,

[0008] A dust collector, which is connected to the furnace via a pipe, is used to remove dust from the flue gas;

[0009] A dust hopper is provided below the dust collector.

[0010] First sealing mechanism;

[0011] Second sealing mechanism;

[0012] A recycling pipe, one end of which is connected to the ash hopper via the first sealing mechanism, and the other end of which is connected to the furnace via the second sealing mechanism;

[0013] The system also includes a power mechanism, which is installed on the recycling pipe and is used to transport ash from the ash hopper to the furnace through the recycling pipe.

[0014] As a preferred structure of this utility model, the first sealing mechanism includes a first connecting pipe and a first sealing sleeve. One end of the first connecting pipe is fixedly connected to the ash hopper, one end of the first sealing sleeve is connected to the other end of the first connecting pipe, and the other end of the first sealing sleeve is connected to one end of the recycling pipe.

[0015] The second sealing mechanism includes a second connecting pipe and a second sealing sleeve. One end of the second connecting pipe is fixedly connected to the furnace, one end of the second sealing sleeve is connected to the other end of the second connecting pipe, and the other end of the second sealing sleeve is connected to the other end of the recovery pipe.

[0016] As a preferred structure of this utility model, one end of the first sealing sleeve is threaded to the other end of the first connecting pipe, and the other end of the first sealing sleeve is threaded to one end of the recycling pipe. The first sealing sleeve is sleeved on the outer wall of one end of the recycling pipe and the other end of the first connecting pipe.

[0017] One end of the second sealing sleeve is threaded to the other end of the second connecting pipe, and the other end of the second sealing sleeve is threaded to the other end of the recycling pipe. The second sealing sleeve is fitted onto the outer wall of the other end of the recycling pipe and the other end of the second connecting pipe.

[0018] As a preferred structure of this utility model, the first sealing mechanism further includes a first sealing ring, which is disposed inside the first sealing sleeve and is located between one end of the recycling pipe and the other end of the first connecting pipe.

[0019] The second sealing mechanism further includes a second sealing ring, which is disposed inside the second sealing sleeve and is located between the other end of the recovery pipe and the other end of the second connecting pipe.

[0020] As a preferred structure of this utility model, both the first sealing ring and the second sealing ring are made of rubber.

[0021] As a preferred structure of this utility model, the circulating fluidized bed boiler also includes a separator, a heat exchange mechanism, and a return feeder;

[0022] The separator is connected to the upper part of the furnace, and the heat exchange mechanism is disposed between the separator and the dust collector;

[0023] The return feeder is located at the lower part of the separator;

[0024] The lower part of the furnace is provided with a return leg, and the return device is connected to the furnace through the return leg;

[0025] The other end of the recycling pipe is connected to the return leg via the second sealing mechanism.

[0026] As a preferred structure of this utility model, the circulating fluidized bed boiler also includes an ash silo, which is connected to the ash hopper via a pipeline.

[0027] As a preferred structure of this utility model, the circulating fluidized bed boiler includes a detection mechanism, an alarm mechanism, and a control mechanism. The detection mechanism is located at the top of the inner wall of the ash silo and is used to detect the material level in the ash silo.

[0028] The detection mechanism is electrically connected to the control mechanism, the alarm mechanism is fixedly installed, the alarm mechanism is electrically connected to the control mechanism, the alarm mechanism is used to issue an alarm, and the control mechanism is used to receive the signal from the detection mechanism and control the start and stop of the alarm mechanism.

[0029] In a preferred embodiment of this invention, the detection mechanism is an ultrasonic level gauge, and the alarm mechanism is an audible and visual alarm.

[0030] As a preferred structure of this utility model, the power mechanism is a silo pump.

[0031] The advantages of the above technical solution, which differs from the existing technology, are as follows: In the circulating fluidized bed boiler of this utility model, by providing a first sealing mechanism and a second sealing mechanism, the connection between the recovery pipe and the ash hopper and the furnace is sealed, which greatly enhances the sealing performance of the connection between the recovery pipe and the ash hopper and the furnace, avoids fly ash leakage, improves the working environment, avoids resource waste, and avoids environmental pollution.

[0032] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0033] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of this application and other related content, and should not be considered as limitations on this application.

[0034] In the accompanying drawings of the instruction manual:

[0035] Figure 1 This is a front view of the circulating fluidized bed boiler described in the specific embodiment;

[0036] Figure 2 This is a schematic diagram of the structure of the recycling pipeline and the first sealing mechanism described in the specific embodiment;

[0037] Figure 3 This is a schematic diagram of the structure of the recycling pipeline and the second sealing mechanism described in the specific embodiment;

[0038] Figure 4 An exploded view of the recovery pipeline and the first sealing mechanism described in the specific embodiment;

[0039] Figure 5 An exploded view of the recovery pipeline and the second sealing mechanism described in the specific embodiment;

[0040] Figure 6 The circuit connection diagram of the circulating fluidized bed boiler described in the specific implementation method is shown below.

[0041] The reference numerals used in the above figures are explained as follows:

[0042] 1. Furnace chamber

[0043] 2. Dust collector

[0044] 3. Ash hopper,

[0045] 4. First sealing mechanism,

[0046] 41. First connecting pipe,

[0047] 42. First sealing sleeve,

[0048] 43. First sealing ring,

[0049] 5. Second sealing mechanism,

[0050] 51. Second connecting pipe,

[0051] 52. Second sealing sleeve,

[0052] 53. Second sealing ring,

[0053] 6. Recycling pipelines,

[0054] 7. Power mechanism,

[0055] 8. Separator

[0056] 9. Heat exchange mechanism,

[0057] 10. Return feeder

[0058] 11. Return leg,

[0059] 12. Gray warehouse,

[0060] 13. Testing institutions,

[0061] 14. Alarm system

[0062] 15. Control mechanism. Detailed Implementation

[0063] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0064] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0065] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0066] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0067] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0068] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0069] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0070] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. These expressions are only for the convenience of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. Furthermore, in this context, it should be understood that when it is mentioned that an element is connected "on" or "below" another element, it can be directly connected not only to the other element "on" or "below," but also indirectly connected to the other element "on" or "below" through an intermediate element.

[0071] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0072] Please see Figures 1 to 6This embodiment relates to a circulating fluidized bed boiler, including a furnace 1, a dust collector 2, an ash hopper 3, a first sealing mechanism 4, a second sealing mechanism 5, a recovery pipe 6, and a power mechanism 7. The furnace 1 is the space for fuel combustion within the boiler, serving as the core combustion area and providing a site for fuel combustion.

[0073] Furthermore, the dust collector 2 is connected to the furnace 1 via a pipe. The dust collector 2 is used to remove dust from the flue gas and is a device that separates dust particles from the flue gas using physical or chemical methods. The ash hopper 3 is located below the dust collector 2 and is used to store the ash separated from the flue gas. The dust collector 2 purifies the flue gas and reduces dust emissions; the ash hopper 3 collects and stores fly ash.

[0074] Furthermore, one end of the recovery pipe 6 is connected to the ash hopper 3 via the first sealing mechanism 4, and the other end of the recovery pipe 6 is connected to the furnace 1 via the second sealing mechanism 5. The power mechanism 7 is installed on the recovery pipe 6 and is used to transport the ash in the ash hopper 3 to the furnace 1 through the recovery pipe 6. The recovery pipe 6 is the channel for ash transport; the power mechanism 7 provides the power for ash transport; and the first sealing mechanism 4 and the second sealing mechanism 5 are used to ensure the sealing of the connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1. Under the action of the power mechanism 7, the ash in the ash hopper 3 is transported back to the furnace 1 to replenish the returned ash. The first sealing mechanism 4 and the second sealing mechanism 5 ensure a tight connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1, preventing ash leakage, thus forming ash recycling and solving the problem of insufficient returned ash after maintenance. At the same time, the installation of the first sealing mechanism 4 and the second sealing mechanism effectively prevents ash leakage, improving the stability and environmental friendliness of boiler operation.

[0075] In this embodiment, the power unit 7 is a silo pump. A silo pump is a device that uses compressed air to transport powdery materials. The silo pump uses the pressure generated by the compressed air to transport the ash in the ash hopper 3 through the recovery pipe 6 to the furnace 1 or the return leg 11, providing power for the ash transport. As the power unit 7, the silo pump has the characteristics of high conveying efficiency and good stability, and can reliably transport the ash to the designated location, ensuring the normal operation of the ash circulation system.

[0076] Specifically, in this embodiment of the circulating fluidized bed boiler, the first sealing mechanism 4 and the second sealing mechanism 5 are provided to seal the connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1, which greatly enhances the sealing performance of the connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1, prevents fly ash leakage, improves the working environment, avoids resource waste, and avoids environmental pollution.

[0077] Optionally, in some embodiments, such as Figures 1 to 5As shown, the first sealing mechanism 4 includes a first connecting pipe 41 and a first sealing sleeve 42. One end of the first connecting pipe 41 is fixedly connected to the ash hopper 3 by welding or bolts, and one end of the first sealing sleeve 42 is connected to the other end of the first connecting pipe 41. The other end of the first sealing sleeve 42 is connected to one end of the recovery pipe 6. The second sealing mechanism 5 includes a second connecting pipe 51 and a second sealing sleeve 52. One end of the second connecting pipe 51 is fixedly connected to the furnace 1 by welding or bolts, and one end of the second sealing sleeve 52 is connected to the other end of the second connecting pipe 51. The other end of the second sealing sleeve 52 is connected to the other end of the recovery pipe 6. The first sealing sleeve 42 and the second sealing sleeve 52 enhance the sealing effect by wrapping around the connection, further strengthening the sealing performance and preventing ash leakage from the connection gap. Compared with traditional connection methods, this greatly reduces the possibility of ash leakage, ensuring a clean working environment and efficient boiler operation.

[0078] Specifically, in this embodiment, such as Figures 1 to 5 As shown, one end of the first sealing sleeve 42 is threadedly connected to the other end of the first connecting pipe 41, and the other end of the first sealing sleeve 42 is threadedly connected to one end of the recovery pipe 6. The first sealing sleeve 42 is fitted onto the outer wall of one end of the recovery pipe 6 and the other end of the first connecting pipe 41. One end of the second sealing sleeve 52 is threadedly connected to the other end of the second connecting pipe 51, and the other end of the second sealing sleeve 52 is threadedly connected to the other end of the recovery pipe 6. The second sealing sleeve 52 is fitted onto the outer wall of the other end of the recovery pipe 6 and the other end of the second connecting pipe 51. In this embodiment, both the inner walls of the first sealing sleeve 42 and the second sealing sleeve 52 are provided with internal threads, and both ends of the recovery pipe 6, the other end of the first connecting pipe 41, and the other end of the first connecting pipe 41 are provided with external threads. The internal and external threads engage with each other to achieve connection. Threaded connection is a connection method achieved by the interlocking of internal and external threads. It features convenient disassembly and installation. Utilizing the interlocking of internal and external threads, the first sealing sleeve 42, the second sealing sleeve 52, the first connecting pipe 41, the second connecting pipe 51, and the recovery pipe 6 are tightly connected together. This provides a reliable connection while facilitating subsequent disassembly, maintenance, and repair. The threaded connection method makes the installation and disassembly of the first sealing mechanism 4 and the second sealing mechanism 5 more convenient, reducing maintenance costs and difficulty, while ensuring the strength and sealing of the connection.

[0079] Preferably, in this embodiment, such as Figures 1 to 5As shown, the first sealing mechanism 4 further includes a first sealing ring 43, which is disposed within the first sealing sleeve 42 and located between one end of the recovery pipe 6 and the other end of the first connecting pipe 41; the second sealing mechanism 5 further includes a second sealing ring 53, which is disposed within the second sealing sleeve 52 and located between the other end of the recovery pipe 6 and the other end of the second connecting pipe 51. Both the first sealing ring 43 and the second sealing ring 53 are made of rubber. The first sealing ring 43 and the second sealing ring 53 are elastic ring-shaped components used to fill gaps and enhance the sealing effect; rubber material has good elasticity and sealing properties. The rubber first sealing ring 43 and the second sealing ring 53 are installed at the connection gaps within the sealing sleeve, utilizing their own elastic deformation to tightly fill the gaps, further improving sealing performance and preventing ash leakage. By incorporating a first sealing ring 43 and a second sealing ring 53, along with a first sealing sleeve 42, a second sealing sleeve 52, and a threaded connection, a multi-layer sealing structure is formed, which greatly improves the sealing performance at the connection point, effectively avoids ash leakage, and ensures the stable operation of the boiler.

[0080] Specifically, in this embodiment, such as Figures 1 to 5 As shown, the circulating fluidized bed boiler also includes a separator 8, a heat exchange mechanism 9, and a return feeder 10. The separator 8 is connected to the upper part of the furnace 1 and is used to separate flue gas and solid particles. The separator 8 is a cyclone separator. The heat exchange mechanism 9 is located between the separator 8 and the dust collector 2. The heat exchange mechanism 9 realizes heat exchange and recovery and is a high-temperature superheater. The return feeder 10 is located at the lower part of the separator 8. The lower part of the furnace 1 is provided with a return leg 11, and the return feeder 10 is connected to the furnace 1 through the return leg 11. The return feeder 10 sends the separated solid particles back to the furnace 1. The return leg 11 is a channel connecting the return feeder 10 and the furnace 1. The other end of the recovery pipe 6 is connected to the return leg 11 through the second sealing mechanism 5. The recovery pipe 6 transports the ash in the ash hopper 3 to the return leg 11 to replenish the circulating ash in the furnace 1. The separator 8 separates the gas-solid mixture at the outlet of the furnace 1. The solid particles enter the return feeder 10 and return to the furnace 1 through the return leg 11 to continue to participate in combustion. The heat exchange mechanism 9 recovers the heat in the flue gas and improves the energy utilization rate.

[0081] Optionally, in some embodiments, such as Figures 1 to 5As shown, the circulating fluidized bed boiler also includes an ash silo 12, which is connected to the ash hopper 3 via a pipeline. The ash silo 12 is a large container used to store excess fly ash. The ash silo 12 receives fly ash from the ash hopper 3, serving to store and regulate the ash quantity. When the ash quantity in the system is excessive, the fly ash can be temporarily stored in the ash silo 12 to ensure the stability of system operation. The ash silo 12 makes the ash management of the boiler system more flexible, avoiding the impact of excessive ash on the normal operation of the boiler, and improving the adaptability and reliability of the system.

[0082] Optionally, in some embodiments, such as Figures 1 to 6 As shown, the circulating fluidized bed boiler includes a detection mechanism 13, an alarm mechanism 14, and a control mechanism 15. The detection mechanism 13 is located at the top of the inner wall of the ash silo 12 and is used to detect the material level inside the ash silo 12. The detection mechanism 13 is used to monitor the material level height in the ash silo 12 in real time; wherein the detection mechanism 13 is an ultrasonic level gauge. The detection mechanism 13 is electrically connected to the control mechanism 15. The alarm mechanism 14 is fixedly installed on the outer wall of the ash silo 12 and is electrically connected to the control mechanism 15. The alarm mechanism 14 is used to issue an alarm, and the control mechanism 15 is used to receive the signal from the detection mechanism 13 and control the start and stop of the alarm mechanism 14. wherein the alarm mechanism 14 is an audible and visual alarm. The detection mechanism 13 monitors the material level in the ash silo 12 in real time. When the detection mechanism 13 detects that the material level has reached a preset threshold, it sends a detection signal to the control mechanism 15. After receiving the signal, the control mechanism 15 identifies and processes it, and then controls the alarm mechanism 14 to start. The alarm mechanism 14 issues an alarm to remind the staff that the ash silo 12 is full of fly ash and needs to be unloaded in time. The detection mechanism 13 and the alarm mechanism 14 realize the automated monitoring and early warning of the material level in the ash silo 12, avoiding the impact on boiler operation due to the ash silo 12 being full or the material level being abnormal, thus improving the safety of operation and the level of automated management.

[0083] Specifically, the first connecting pipe 41 is fixedly connected to the ash hopper 3 by welding or bolts. Then, the first sealing sleeve 42 is screwed onto the first connecting pipe 41 by threads. Next, the first sealing ring 43 is placed inside the first sealing sleeve 42. Then, one end of the recovery pipe 6 is threaded onto the first sealing sleeve 42 until the recovery pipe 6 presses against the first sealing ring 43. Similarly, the second connecting pipe 51 is fixedly connected to the furnace 1 (or return leg 11) by welding or bolts. Then, the second sealing sleeve 52 is screwed onto the second connecting pipe 51 by threads. Next, the second sealing ring 53 is placed inside the first sealing sleeve 42. Then, the other end of the recovery pipe 6 is threaded onto the second sealing sleeve 52 until the recovery pipe 6 presses against the second sealing ring 53. This completes the sealed connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1. This greatly enhances the sealing performance at the connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1, prevents fly ash leakage, improves the working environment, avoids resource waste, and avoids environmental pollution. When maintenance or repair is required at the connection between the recovery pipe 6 and the ash hopper 3 and the furnace 1, the first sealing sleeve 42 and the second sealing sleeve 52 can be disassembled by rotating the thread, and the sealing ring can be removed for inspection and replacement.

[0084] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A circulating fluidized bed boiler, characterized in that, include: Furnace, A dust collector, which is connected to the furnace via a pipe, is used to remove dust from the flue gas; A dust hopper is provided below the dust collector. First sealing mechanism; Second sealing mechanism; A recycling pipe, one end of which is connected to the ash hopper via the first sealing mechanism, and the other end of which is connected to the furnace via the second sealing mechanism; The system also includes a power mechanism, which is installed on the recycling pipe and is used to transport ash from the ash hopper to the furnace through the recycling pipe.

2. The circulating fluidized bed boiler according to claim 1, characterized in that: The first sealing mechanism includes a first connecting pipe and a first sealing sleeve. One end of the first connecting pipe is fixedly connected to the ash hopper, one end of the first sealing sleeve is connected to the other end of the first connecting pipe, and the other end of the first sealing sleeve is connected to one end of the recycling pipe. The second sealing mechanism includes a second connecting pipe and a second sealing sleeve. One end of the second connecting pipe is fixedly connected to the furnace, one end of the second sealing sleeve is connected to the other end of the second connecting pipe, and the other end of the second sealing sleeve is connected to the other end of the recovery pipe.

3. The circulating fluidized bed boiler according to claim 2, characterized in that: One end of the first sealing sleeve is threaded to the other end of the first connecting pipe, and the other end of the first sealing sleeve is threaded to one end of the recycling pipe. The first sealing sleeve is fitted onto the outer wall of one end of the recycling pipe and the other end of the first connecting pipe. One end of the second sealing sleeve is threaded to the other end of the second connecting pipe, and the other end of the second sealing sleeve is threaded to the other end of the recycling pipe. The second sealing sleeve is fitted onto the outer wall of the other end of the recycling pipe and the other end of the second connecting pipe.

4. The circulating fluidized bed boiler according to claim 2 or 3, characterized in that: The first sealing mechanism further includes a first sealing ring, which is disposed inside the first sealing sleeve and is located between one end of the recovery pipe and the other end of the first connecting pipe. The second sealing mechanism further includes a second sealing ring, which is disposed inside the second sealing sleeve and is located between the other end of the recovery pipe and the other end of the second connecting pipe.

5. The circulating fluidized bed boiler according to claim 4, characterized in that: Both the first sealing ring and the second sealing ring are made of rubber.

6. The circulating fluidized bed boiler according to any one of claims 1 to 3, characterized in that: The circulating fluidized bed boiler also includes a separator, a heat exchange mechanism, and a return feeder; The separator is connected to the upper part of the furnace, and the heat exchange mechanism is disposed between the separator and the dust collector; The return feeder is located at the lower part of the separator; The lower part of the furnace is provided with a return leg, and the return device is connected to the furnace through the return leg; The other end of the recycling pipe is connected to the return leg via the second sealing mechanism.

7. The circulating fluidized bed boiler according to any one of claims 1 to 3, characterized in that: The circulating fluidized bed boiler also includes an ash silo, which is connected to the ash hopper via a pipeline.

8. The circulating fluidized bed boiler according to claim 7, characterized in that: The circulating fluidized bed boiler includes a detection mechanism, an alarm mechanism, and a control mechanism. The detection mechanism is located at the top of the inner wall of the ash silo and is used to detect the material level in the ash silo. The detection mechanism is electrically connected to the control mechanism, the alarm mechanism is fixedly installed, the alarm mechanism is electrically connected to the control mechanism, the alarm mechanism is used to issue an alarm, and the control mechanism is used to receive the signal from the detection mechanism and control the start and stop of the alarm mechanism.

9. The circulating fluidized bed boiler according to claim 8, characterized in that: The detection mechanism is an ultrasonic level gauge, and the alarm mechanism is an audible and visual alarm.

10. The circulating fluidized bed boiler according to any one of claims 1 to 3, characterized in that: The power mechanism is a silo pump.

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