Air cap for circulating fluidized boiler

Abstract

The air cap for the circulating fluidized boiler comprises an air guide pipe and an air cap head arranged on the air guide pipe in a sleeved mode, a limiting ring is arranged at the position, corresponding to the lower portion of the air cap head, of the air guide pipe, a limiting piece used for limiting the air cap head is arranged on the limiting ring, the limiting piece is detachably installed on the limiting ring, and the air cap head is arranged on the air guide pipe. One end of the limiting piece abuts against the hood head, and the other end abuts against the limiting ring; a ventilation opening is formed in the end, penetrating into the air cap head, of the air guide pipe, a ventilation gap communicated with the ventilation opening exists between the inner wall of the air cap head and the outer wall of the air guide pipe, an air outlet communicated with the ventilation gap is formed in the lower portion of the air cap head, and an air blocking piece is arranged at the position, corresponding to the ventilation gap, above the air cap head. At least four wind blocking pieces are evenly arranged in the circumferential direction of the wind cap head. The air cap for the circulating fluidized boiler has the advantages of being easy to assemble and adjust, good in applicability, stable and reliable.

Description

Technical Field

[0001] This utility model belongs to the technical field of boiler air caps, and in particular relates to an air cap for a circulating fluidized boiler. Background Technology

[0002] Circulating fluidized bed (CFB) boilers involve numerous pieces of equipment. The combustion system includes air chambers, air distributors, combustion chambers, furnace, and fuel and coal feeding systems. The air chambers, connected to the air distributors, function to stabilize pressure and equalize airflow. The air distributors bear the bed material, ensuring that the air pressure is essentially equal throughout the isobaric air chamber area. They also have air caps to evenly distribute fluidized air across the entire cross-section of the bed. As CFB boilers develop towards higher parameters, boiler caps are continuously increasing in capacity. Simultaneously, the required bed material has also increased, necessitating a larger air distributor area for fluidized bed materials. Uneven air distribution remains a persistent problem in CFB boilers, becoming more pronounced in large-capacity boilers. Therefore, the specifications of the air caps installed on the air distributors of a single CFB boiler vary, requiring the production and installation of air caps with different resistance levels based on the air resistance of different areas. Furthermore, since the wind caps are arranged on the air distribution plate, in order to facilitate the replacement and adjustment of the wind caps by the operators, the installation and adjustment mechanism of the wind caps should be arranged as high as possible. However, the existing wind caps have the problem of inconvenient installation and adjustment, which increases the difficulty of operation for the operators and is not conducive to improving the convenience of use and maintenance of the wind caps. Utility Model Content

[0003] In view of this, the present invention aims to provide a wind cap for a circulating fluidized bed boiler to solve the problem of inconvenient installation and adjustment of existing wind caps.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A wind cap for a circulating fluidized bed boiler includes an air guide pipe and a wind cap head fitted onto the air guide pipe. A limiting ring is provided on the air guide pipe at a position corresponding to the area below the wind cap head. A limiting member is provided on the limiting ring for limiting the wind cap head. The limiting member is detachably mounted on the limiting ring, with one end abutting the wind cap head and the other end abutting the limiting ring. A ventilation opening is provided at the end of the air guide pipe extending into the wind cap head. A ventilation gap communicating with the ventilation opening exists between the inner wall of the wind cap head and the outer wall of the air guide pipe. A ventilation gap communicating with the ventilation gap is located below the wind cap head. The air outlet has a wind-blocking component located above the ventilation gap. At least four wind-blocking components are evenly distributed around the circumference of the hood head. Each wind-blocking component has one end on the hood head and the other end facing the air guide duct. The air guide duct has a locking block located below the wind-blocking component. Two locking blocks are evenly distributed around the circumference of the air guide duct. The hood head has a vertical groove and an annular groove that can cooperate with the locking blocks. The annular groove is coaxial with the hood head. Two vertical grooves are provided corresponding to the locking blocks, and each vertical groove is connected to the annular groove.

[0006] Furthermore, a protrusion is provided on the head of the hood at the connection between the vertical groove and the annular groove.

[0007] Furthermore, multiple air outlets are evenly arranged around the circumference of the hood.

[0008] Furthermore, the vertical groove is provided corresponding to the air outlet, with one end of the vertical groove connected to the air outlet and the other end connected to the annular groove.

[0009] Furthermore, each of the card blocks has a conical end.

[0010] Furthermore, the limiting member includes a left half ring and a right half ring, both of which are mounted on the limiting ring by fixing screws, and the limiting ring is provided with threaded holes that cooperate with the fixing screws.

[0011] Furthermore, two fixing screws are provided, and both the left and right half-rings are provided with positioning rings that cooperate with the fixing screws. The positioning rings on the left and right half-rings are arranged at different heights.

[0012] Furthermore, both the left and right half-rings have beveled sections on the side facing the air guide duct.

[0013] Compared with the prior art, the air cap for a circulating fluidized bed boiler described in this utility model has the following advantages:

[0014] The wind cap for a circulating fluidized bed boiler described in this utility model has the advantages of being easy to assemble and adjust, having good applicability, and being stable and reliable. Wind caps with different numbers of wind-blocking components can be selected for installation according to the wind resistance of different areas. The installation operation is convenient, and the stability after installation is good. The wind caps are not easy to fall off, which helps to ensure the stable operation of the circulating fluidized bed boiler. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of a wind cap for a circulating fluidized boiler according to an embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of a wind cap for a circulating fluidized boiler according to an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the left half ring of a wind cap for a circulating fluidized boiler according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the wind cap head when four wind-blocking components are provided in the wind cap of a circulating fluidized boiler according to an embodiment of the present utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the wind cap head when eight wind choke components are provided in an embodiment of the present utility model for a circulating fluidized boiler.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Air duct; 2. Air cap head; 3. Limiting ring; 4. Limiting component; 5. Fixing screw; 6. Air outlet; 7. Left half ring; 8. Positioning ring; 9. Angled part; 10. Ventilation gap; 11. Vertical groove; 12. Annular groove; 13. Protrusion; 14. Locking block; 15. Air baffle; 16. Conical end. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] A type of air cap for a circulating fluidized bed boiler, such as Figures 1 to 5 As shown, the device includes an air duct 1 and a hood 2 fitted onto the air duct 1. A limiting ring 3 is provided on the air duct 1 at a position corresponding to the area below the hood 2. A limiting member 4 for limiting the hood 2 is provided on the limiting ring 3. The limiting member 4 is detachably mounted on the limiting ring 3, with one end of the limiting member 4 pressing against the hood 2 and the other end pressing against the limiting ring 3. A ventilation opening is provided at the end of the air duct 1 that extends into the hood 2. A ventilation gap 10 communicating with the ventilation opening exists between the inner wall of the hood 2 and the outer wall of the air duct 1. An air outlet 6 communicating with the ventilation gap 10 is provided below the hood 2, and a corresponding air outlet 6 is provided above. At least four wind-blocking components 15 are evenly arranged around the circumference of the wind cap head 2. Each wind-blocking component 15 has one end on the wind cap head 2 and the other end facing the air guide duct 1. A locking block 14 is provided on the air guide duct 1 at a position below the wind-blocking component 15. Two locking blocks 14 are evenly arranged around the circumference of the air guide duct 1. The wind cap head 2 is provided with a vertical groove 11 and an annular groove 12 that can cooperate with the locking block 14. The annular groove 12 is coaxially arranged with the wind cap head 2. Two vertical grooves 11 are provided corresponding to the locking blocks 14. Each vertical groove 11 is connected to the annular groove 12.

[0028] For example, the hood head 2 is a cylindrical structure. Both the hood head 2 and the limiting ring 3 are coaxially arranged with the air guide duct 1. The locking block 14 is fixed on the air guide duct 1, and the annular groove 12 is arranged above the vertical groove 11. Four, six, eight, or more wind-blocking components 15 can be evenly arranged, and each wind-blocking component 15 is fixed on the hood head 2. In actual use, by designing multiple wind-blocking components 15 as needed, the wind resistance of the hood head 2 can be adjusted. If necessary, the area of ​​a single wind-blocking component 15 can also be designed to adjust the wind resistance of the hood head 2. Those skilled in the art can set these according to actual needs, and will not elaborate further here.

[0029] By setting different numbers or areas of air-blocking elements 15, the resistance of the hood head 2 to the airflow blown out through the air duct 1 can be changed. Therefore, those skilled in the art can select a hood head 2 with suitable air-blocking elements 15 for installation according to the required air resistance to meet the air resistance requirements of different areas. In addition, those skilled in the art can also fine-tune the air resistance by rotating the hood head 2 so that the air-blocking elements 15 are aligned, misaligned, or staggered with the locking blocks 14 on the air duct 1, so as to better meet the air resistance requirements of different areas and further improve the applicability and ease of use of this hood.

[0030] In practical applications, the hood head 2 has a protrusion 13 at the connection between the vertical groove 11 and the annular groove 12. For example, two protrusions 13 are provided on each of the left and right sides of each vertical groove 11. The vertical width of the corresponding annular groove 12 needs to be greater than the vertical width of the locking block 14. In particular, there needs to be a gap between the top of the protrusion 13 and the top wall of the annular groove 12 to allow the locking block 14 to pass through. By providing protrusions 13 on both the left and right sides of each vertical groove 11, the annular groove 12 and the vertical groove 11 can be effectively separated. Only when the operator removes the limiting member 4, releasing the restriction on the hood head 2, and allowing the hood head 2 to move downwards under its own weight, can the locking block 14 move into the vertical groove 11 through the gap between the top of the protrusion 13 and the top wall of the annular groove 12, thereby achieving the disassembly of the hood head 2. By providing a protrusion 13 at the connection between the annular groove 12 and the vertical groove 11, the locking block 14 can be effectively limited, preventing the wind cap head 2 from accidentally coming off after installation.

[0031] Specifically, the operator can first align the vertical groove 11 of the hood head 2 with the locking block 14. After the locking block 14 moves to the top of the vertical groove 11, the operator can rotate the hood head 2, causing the locking block 14 to move into the annular groove 12. By rotating and adjusting the hood head 2, the operator can adjust the wind resistance of the hood head 2 by using the locking block 14 in conjunction with the wind-blocking component 15. The operator can then install a limiting component 4 on the limiting ring 3 and insert the limiting component 4 into the gap between the limiting ring 3 and the hood head 2. The limiting component 4 will then push the hood head 2 upwards, at which point the locking block 14 and the limiting component 4 will clamp and fix the hood head 2, thus achieving the limiting and fixing of the hood head 2. Since the hood head 2 has moved upward a certain distance, the locking block 14 is now positioned between the two protrusions 13. Even if the hood head 2 rotates unexpectedly, the protrusions 13 can effectively limit the locking block 14, preventing it from moving into the vertical groove 11 and thus preventing the hood head 2 from coming off the air duct 1.

[0032] Preferably, multiple air outlets 6 are evenly arranged around the circumference of the hood head 2. For example, four, six or more air outlets 6 can be evenly arranged. Those skilled in the art can also set multiple air outlets 6 according to actual needs. By setting multiple air outlets 6, it is beneficial to improve the uniformity of airflow from this hood.

[0033] In practical applications, the vertical groove 11 is positioned corresponding to the air outlet 6, with one end of the vertical groove 11 connected to the air outlet 6 and the other end connected to the annular groove 12. By positioning the vertical groove 11 corresponding to the air outlet 6, interference between the air outlet 6 and the vertical groove 11 can be avoided. At the same time, it is easier for operators to align and assemble the locking block 14 with the vertical groove 11, reducing the assembly difficulty of this type of wind cap.

[0034] Preferably, each of the locking blocks 14 is provided with a conical end 16. By providing a conical end 16 on the top of the locking block 14, it is easier for the locking block 14 to be inserted into the vertical slot 11, further reducing the assembly difficulty of this wind cap.

[0035] Preferably, the limiting member 4 includes a left half-ring 7 and a right half-ring, both of which are mounted on the limiting ring 3 by fixing screws 5. The limiting ring 3 has threaded holes that mate with the fixing screws 5. For example, the limiting ring 3 is fixed to the air duct 1. By adopting a split-structure limiting member 4, the operator can easily insert the two half-rings between the limiting ring 3 and the vent head 2 during assembly, reducing the assembly difficulty for the operator.

[0036] In practical applications, two fixing screws 5 are provided. Both the left and right halves of the ring 7 are equipped with positioning rings 8 that mate with the fixing screws 5. The positioning rings 8 on the left and right halves of the ring 7 are staggered in height. For example, positioning rings 8 are fixed at both ends of the left and right halves of the ring 7 and the right half (the structure is similar to the left half 7, so no attached diagram is provided). When a positioning ring 8 is positioned above the end of the left half 7, the corresponding positioning ring 8 at the end of the right half 7 is positioned below it. This allows the positioning rings 8 at the ends of the left and right halves of the ring 7 to be spliced ​​together, which not only improves the structural strength of the connection between the left and right halves of the ring 7 but also does not affect the limiting of the hood head 2 by the limiting member 4.

[0037] Preferably, both the left and right halves of the ring 7 and the right half of the ring have beveled portions 9 on the side facing the air guide duct 1. The beveled portions 9 reduce the difficulty of inserting the left and right halves of the ring 7 and facilitate the operator's assembly of them. Furthermore, by using fixing screws 5 to install the fixing limiting member 4, even if the fixing screws 5 loosen, as long as the fixing screws 5 do not come out, the limiting member 4 can still stably limit the air cap head 2, preventing it from coming out. In addition, after the left and right halves of the ring 7 and the right half of the ring are joined to form the limiting member 4, the beveled portions 9 of both can form a recess on the limiting member 4. This recess can also guide and disperse the airflow, changing the direction of the airflow, thereby allowing the airflow to be blown more evenly out of the air cap head 2 through the air outlet 6, further improving the uniformity of the airflow from the air cap.

[0038] The wind cap for a circulating fluidized bed boiler described in this utility model has the advantages of being easy to assemble and adjust, having good applicability, and being stable and reliable. Wind caps with different numbers of wind-blocking components can be selected for installation according to the wind resistance of different areas. The installation operation is convenient, and the stability after installation is good. The wind caps are not easy to fall off, which helps to ensure the stable operation of the circulating fluidized bed boiler.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wind cap for a circulating fluidized bed boiler, characterized in that: The device includes an air duct (1) and a hood (2) fitted onto the air duct (1). A limiting ring (3) is provided on the air duct (1) at a position corresponding to the lower part of the hood (2). A limiting member (4) for limiting the hood (2) is provided on the limiting ring (3). The limiting member (4) is detachably installed on the limiting ring (3). One end of the limiting member (4) abuts against the hood (2), and the other end abuts against the limiting ring (3). A ventilation opening is provided at one end of the air duct (1) that extends into the hood (2). A ventilation gap (10) communicating with the ventilation opening exists between the inner wall of the hood (2) and the outer wall of the air duct (1). An air outlet (6) communicating with the ventilation gap (10) is provided below the hood (2), and an air outlet (6) corresponding to the ventilation opening is provided above. A wind-blocking component (15) is provided at the position of the gap (10). At least four wind-blocking components (15) are evenly arranged around the circumference of the hood head (2). One end of each wind-blocking component (15) is set on the hood head (2), and the other end is set towards the air guide pipe (1). A locking block (14) is provided on the air guide pipe (1) at the position below the wind-blocking component (15). Two locking blocks (14) are evenly arranged around the circumference of the air guide pipe (1). The hood head (2) is provided with a vertical groove (11) and an annular groove (12) that can cooperate with the locking block (14). The annular groove (12) is coaxially arranged with the hood head (2). Two vertical grooves (11) are provided corresponding to the locking blocks (14). Each vertical groove (11) is connected to the annular groove (12).

2. The air cap for a circulating fluidized bed boiler according to claim 1, characterized in that: The hood head (2) is provided with a protrusion (13) at the connection between the vertical groove (11) and the annular groove (12).

3. The air cap for a circulating fluidized bed boiler according to claim 1, characterized in that: Multiple air outlets (6) are evenly arranged around the circumference of the hood head (2).

4. The air cap for a circulating fluidized bed boiler according to claim 3, characterized in that: The vertical groove (11) is provided corresponding to the air outlet (6), and one end of the vertical groove (11) is connected to the air outlet (6), and the other end is connected to the annular groove (12).

5. The air cap for a circulating fluidized bed boiler according to claim 1, characterized in that: Each of the card blocks (14) is provided with a conical end (16) on its upper part.

6. The air cap for a circulating fluidized bed boiler according to claim 1, characterized in that: The limiting member (4) includes a left half ring (7) and a right half ring. Both the left half ring (7) and the right half ring are mounted on the limiting ring (3) by fixing screws (5). The limiting ring (3) is provided with threaded holes that cooperate with the fixing screws (5).

7. The wind cap for a circulating fluidized bed boiler according to claim 6, characterized in that: Two fixing screws (5) are provided. The left half ring (7) and the right half ring are provided with positioning rings (8) that cooperate with the fixing screws (5). The positioning rings (8) on the left half ring (7) and the right half ring are arranged at different heights.

8. A wind cap for a circulating fluidized bed boiler according to claim 6 or 7, characterized in that: Both the left half-ring (7) and the right half-ring have a sloping section (9) on the side facing the guide duct (1).

Images