Coal feeder for coal bunker of CFB (circulating fluidized bed) boiler

Abstract

The utility model provides a CFB boiler coal bunker coal feeding device which comprises a coal bunker and a coal feeder, and the coal bunker is provided with an anti-blocking mechanism and a detection mechanism. At least two detection mechanisms are arranged at intervals in the coal discharging direction of the coal bunker, each detection mechanism comprises a mounting seat arranged on the coal bunker and a material blocking switch detector arranged on the mounting seat, the material blocking switch detector is detachably mounted on the mounting seat, and a blocking piece capable of being matched with the material blocking switch detector is arranged in the mounting seat; the plugging piece is installed on the installation base in a sliding mode, the sliding direction of the plugging piece is the same as the action direction of a microswitch on the plugging switch detector, and a detachable limiting assembly is arranged at the position, corresponding to the plugging piece, of the installation base. The CFB boiler coal bunker coal feeding device is not prone to blockage, can effectively monitor blockage of the coal bunker, and has the advantages of being convenient to use and maintain.

Description

Technical Field

[0001] This utility model belongs to the field of coal feeder technology, and in particular relates to a coal feeding device for a CFB boiler coal bunker. Background Technology

[0002] CFB boilers are high-pressure, single-drum, natural circulation water-tube boilers. With rising market coal prices, blending low-quality coal with high-quality coal has become an important economic indicator for power plants to achieve profitability. However, low-quality coal has a high moisture and clay content, and its particle size varies greatly. It adheres strongly to the inner wall of the coal bunker, easily causing large lumps to gradually form and stick to the inner wall. These lumps block the bunker outlet, creating a fault and preventing coal from being fed into the bunker, ultimately leading to a coal feeder interruption.

[0003] Existing coal bunker chutes are typically equipped with anti-clogging devices and detection devices to prevent interruptions in coal delivery. However, the accuracy of a single detection device is unreliable. Furthermore, due to the harsh environment inside the coal bunker, the long length of the chutes, and the need for misalignment between the detection devices and anti-clogging devices, localized coal accumulation still occurs at the detection device installation points. This makes the detection devices prone to damage or false detections. Therefore, regular maintenance of the detection devices is necessary to ensure stable and accurate detection. However, existing detection devices generally use flanges to connect to the chutes. Disassembly during coal delivery can cause leaks, requiring shutdown for maintenance, increasing the difficulty of use and maintenance, and affecting the normal operation of the boiler. Utility Model Content

[0004] In view of this, the present invention aims to propose a coal feeding device for CFB boiler coal bunkers to solve the problem that the existing detection devices are inconvenient to use and maintain, resulting in poor detection accuracy.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A CFB boiler coal bunker feeding device includes a coal bunker and a coal feeder. The coal bunker is equipped with an anti-blocking mechanism and a detection mechanism. At least two detection mechanisms are arranged at intervals along the coal feeding direction of the coal bunker. Each detection mechanism includes a mounting base on the coal bunker and a blockage switch detector mounted on the mounting base. The blockage switch detector is detachably mounted on the mounting base. The mounting base is equipped with a sealing element that can cooperate with the blockage switch detector. The sealing element is slidably mounted on the mounting base. The sliding direction of the sealing element is the same as the action direction of the microswitch on the blockage switch detector. The mounting base is equipped with a detachable limiting component at the position corresponding to the sealing element.

[0007] Furthermore, the mounting base is provided with a mounting hole that slides with the sealing component, and the limiting component includes a limiting member provided on the mounting base. The limiting member is detachably mounted on the mounting base, and one end of the limiting member extending into the mounting hole can press against the sealing component.

[0008] Furthermore, the end of the sealing member facing the blockage switch detector is provided with a slot, the end of the limiting member extending into the mounting hole is provided with a spherical part, and the sealing member is provided with a beveled part that can cooperate with the spherical part at the position corresponding to the slot.

[0009] Furthermore, at least two slots are evenly distributed along the circumference of the mounting sealing member.

[0010] Furthermore, the mounting base is provided with a threaded hole for installing a limiting member, the threaded hole communicating with the mounting hole, and the limiting member is provided with an external thread that mates with the threaded hole.

[0011] Furthermore, the mounting base is provided with a sliding groove at the position corresponding to the mounting hole, and at least two sliding grooves are provided at intervals along the circumference of the mounting hole. Each sliding groove is connected to the mounting hole, and the sealing member is provided with a slider that slides in cooperation with the sliding groove.

[0012] Furthermore, the end of the sealing component facing the coal bunker is provided with a conical end.

[0013] Furthermore, the sealing component is a hollow structural component.

[0014] Compared with the prior art, the CFB boiler coal bunker feeding device of this utility model has the following advantages:

[0015] The CFB boiler coal bunker feeding device described in this utility model is less prone to clogging and can effectively monitor coal bunker blockage, offering advantages in ease of use and maintenance. By spaced out multiple detection mechanisms, the accuracy of coal bunker blockage detection is improved, and the redundant design of multiple detection mechanisms facilitates replacement and maintenance by operators, enhancing the reliability of the detection mechanisms during operation. Furthermore, by incorporating a sliding sealing element on the mounting base, the sealing element not only transmits the pressure inside the coal bunker after blockage to the blockage switch detector, but also allows operators to install a limiting element when the blockage switch detector needs to be disassembled for replacement or maintenance. This limiting element holds the end of the sealing element facing the blockage switch detector, effectively sealing the mounting hole and preventing coal leakage from the coal bunker, thus reducing the difficulty of using and maintaining this coal feeding device. Attached Figure Description

[0016] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a CFB boiler coal bunker feeding device according to an embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the detection mechanism in a CFB boiler coal bunker feeding device according to an embodiment of the present invention;

[0019] Figure 3 for Figure 2 Exploded view.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Anti-blocking mechanism; 2. Coal bunker; 3. Coal feeder; 4. Detection mechanism; 5. Mounting base; 6. Blocking switch detector; 7. Limiting component; 8. Sealing component; 9. Sliding block; 10. Slot; 11. Inclined part; 12. Conical end; 13. Slide groove; 14. Threaded hole; 15. Spherical part; 16. Mounting hole. Detailed Implementation

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0023] 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.

[0024] 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.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] A coal feeding device for a CFB boiler coal bunker, such as Figures 1 to 3 As shown, the system includes a coal bunker 2 and a coal feeder 3. The coal bunker 2 is equipped with an anti-blocking mechanism 1 and a detection mechanism 4. At least two detection mechanisms 4 are arranged at intervals along the coal feeding direction of the coal bunker 2. Each detection mechanism 4 includes a mounting base 5 on the coal bunker 2 and a blockage switch detector 6 on the mounting base 5. The blockage switch detector 6 is detachably mounted on the mounting base 5. The mounting base 5 is equipped with a sealing element 8 that can cooperate with the blockage switch detector 6. The sealing element 8 is slidably mounted on the mounting base 5. The sliding direction of the sealing element 8 is the same as the action direction of the micro switch on the blockage switch detector 6. The mounting base 5 is equipped with a detachable limiting component at the position corresponding to the sealing element 8.

[0027] For example, the mounting base 5 can be welded to the coal bunker 2 or fixed to the coal bunker 2 with screws. Those skilled in the art can choose a suitable method to fix the mounting base 5 according to actual needs to achieve a stable setting of the mounting base 5 on the coal bunker 2, thereby ensuring that the blockage switch detector 6 on the mounting base 5 can continuously and stably perform its detection function. The blockage switch detector 6 can use existing equipment, and the blockage switch detector 6 and the mounting base 5 can be connected by a flange. The operation and power supply methods of the blockage switch detector 6 are existing technologies, and this utility model does not involve improvements to the blockage switch detector 6, so they will not be described in detail here.

[0028] In practical applications, two, three, or more detection mechanisms 4 can be spaced out along the coal feeding direction of the coal bunker 2. By spaced out multiple detection mechanisms 4, the accuracy of detecting blockages in the coal bunker 2 can be improved, thus facilitating handling by operators. Simultaneously, multiple detection mechanisms 4 can form a redundant design; when a single detection mechanism 4 malfunctions or generates a false alarm, the detection results of multiple mechanisms 4 can be used together to reduce the possibility of false detections. Furthermore, when a single detection mechanism 4 needs to be disassembled, the other detection mechanisms 4 can still detect blockages. Those skilled in the art can also configure the number and location of the detection mechanisms 4 according to actual needs, which will not be elaborated here.

[0029] Preferably, the mounting base 5 is provided with a mounting hole 16 that slides with the sealing member 8. The limiting component includes a limiting member 7 provided on the mounting base 5. The limiting member 7 is detachably mounted on the mounting base 5, and one end of the limiting member 7 extending into the mounting hole 16 can abut against the sealing member 8. Exemplarily, the mounting base 5 is provided with a threaded hole 14 for mounting the limiting member 7. The threaded hole 14 communicates with the mounting hole 16, and the limiting member 7 is provided with an external thread that mates with the threaded hole 14.

[0030] By setting a sliding sealing element 8 on the mounting base 5, the sealing element 8 can not only transmit the pressure in the coal bunker 2 after blockage to the blockage switch detector 6, but also, when the blockage switch detector 6 needs to be disassembled for replacement and maintenance, the operator can install a limiting element 7 to hold the end of the sealing element 8 facing the blockage switch detector 6, so that the sealing element 8 can seal the mounting hole 16 and prevent coal leakage in the coal bunker 2.

[0031] In practical applications, the end of the sealing member 8 facing the blockage switch detector 6 is provided with a slot 10, and the end of the limiting member 7 extending into the mounting hole 16 is provided with a spherical part 15. The sealing member 8 is provided with a beveled part 11 corresponding to the slot 10, which can cooperate with the spherical part 15. By providing the spherical part 15 on the limiting member 7, it is easy for the limiting member 7 to be inserted into the slot 10 and push the sealing member 8 away from the blockage switch detector 6 along the beveled part 11 of the slot 10. This facilitates the subsequent disassembly and installation of the blockage switch detector 6, reduces the assembly difficulty of the limiting member 7, and ensures that the limiting member 7 can push the sealing member 8 to continuously and stably block the mounting hole 16, preventing coal leakage.

[0032] Preferably, at least two slots 10 are evenly arranged around the circumference of the mounting sealing member 8. For example, two, three or more slots 10 can be evenly arranged, and correspondingly, limiting members 7 are arranged one-to-one with slots 10. By setting multiple limiting members 7 and slots 10, multiple limiting members 7 can form multi-point limiting on the sealing member 8, which helps to improve the limiting effect of the limiting members 7 on the sealing member 8 and ensures that the sealing member 8 can continuously and stably seal the mounting hole 16.

[0033] In practical applications, the mounting base 5 is provided with a threaded hole 14 for installing the limiting member 7. The threaded hole 14 communicates with the mounting hole 16, and the limiting member 7 is provided with an external thread that mates with the threaded hole 14. For example, the limiting member 7 can be provided with a handle or a polygonal hole to facilitate the operator to screw the limiting member 7. By utilizing the engagement between the threaded hole 14 and the external thread on the limiting member 7, even if there is coal accumulation at the sealing member 8, the operator can push the sealing member 8 to move by screwing the limiting member 7, thereby sealing the mounting hole 16 and pushing out the coal accumulation at the mounting hole 16. This not only improves the sealing effect of the sealing member 8 on the mounting hole 16, but also effectively cleans the coal accumulation at the installation location of the blockage switch detector 6, ensuring that the sealing member 8 can continuously and stably transmit the pressure in the coal bunker 2 to the blockage switch detector 6 for detection.

[0034] Preferably, the mounting base 5 is provided with a groove 13 corresponding to the mounting hole 16. At least two grooves 13 are spaced apart along the circumference of the mounting hole 16, and each groove 13 communicates with the mounting hole 16. The sealing member 8 is provided with a slider 9 that slides in cooperation with the groove 13. Exemplarily, two, three, or more sliders 9 can be evenly arranged, each slider 9 fixed to the sealing member 8, and the slider 9 needs to be offset from the limiting member 7 to avoid mutual interference. By providing multiple sliders 9, the sliding stability of the sealing member 8 is improved. Those skilled in the art can also set the number of sliders 9 according to actual needs, which will not be elaborated here.

[0035] In an optional embodiment, the slider 9 may also be equipped with structures such as balls and rollers to reduce friction, ensure that the sealing element 8 can better transmit pressure, and help ensure the blockage switch detector 6.

[0036] Preferably, the end of the sealing member 8 facing the coal bunker 2 is provided with a conical end 12. By providing the conical end 12 on the sealing member 8, it is not only convenient to install the sealing member 8, but also when the sealing member 8 is pushed out of the mounting hole 16 by the limiting member 7, the conical end 12 can also play a good role in cleaning the accumulated coal at the opening of the mounting hole 16, pushing the accumulated coal out of the mounting hole 16, ensuring the accuracy of subsequent detection by the blockage switch detector 6, and reducing the difficulty of use and maintenance of the detection mechanism 4.

[0037] Preferably, the sealing element 8 is a hollow structure. By using a hollow structure for the sealing element 8, it is beneficial to reduce the mass of the sealing element 8, thereby enabling the sealing element 8 to transmit pressure better.

[0038] The CFB boiler coal bunker feeding device described in this utility model is less prone to clogging and can effectively monitor coal bunker blockage, offering advantages in ease of use and maintenance. By spaced out multiple detection mechanisms, the accuracy of coal bunker blockage detection is improved, and the redundant design of multiple detection mechanisms facilitates replacement and maintenance by operators, enhancing the reliability of the detection mechanisms during operation. Furthermore, by incorporating a sliding sealing element on the mounting base, the sealing element not only transmits the pressure inside the coal bunker after blockage to the blockage switch detector, but also allows operators to install a limiting element when the blockage switch detector needs to be disassembled for replacement or maintenance. This limiting element holds the end of the sealing element facing the blockage switch detector, effectively sealing the mounting hole and preventing coal leakage from the coal bunker, thus reducing the difficulty of using and maintaining this coal feeding device.

[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 coal feeding device for a CFB boiler coal bunker, comprising a coal bunker (2) and a coal feeder (3), wherein the coal bunker (2) is provided with an anti-blocking mechanism (1) and a detection mechanism (4), characterized in that: At least two detection mechanisms (4) are arranged at intervals along the coal feeding direction of the coal bunker (2). Each detection mechanism (4) includes a mounting base (5) on the coal bunker (2) and a blockage switch detector (6) on the mounting base (5). The blockage switch detector (6) is detachably mounted on the mounting base (5). The mounting base (5) is provided with a sealing component (8) that can cooperate with the blockage switch detector (6). The sealing component (8) is slidably mounted on the mounting base (5). The sliding direction of the sealing component (8) is the same as the action direction of the micro switch on the blockage switch detector (6). The mounting base (5) is provided with a detachable limiting component at the position corresponding to the sealing component (8).

2. The CFB boiler coal bunker feeding device according to claim 1, characterized in that: The mounting base (5) is provided with a mounting hole (16) that slides with the sealing member (8). The limiting component includes a limiting member (7) provided on the mounting base (5). The limiting member (7) is detachably mounted on the mounting base (5). One end of the limiting member (7) that extends into the mounting hole (16) can press against the sealing member (8).

3. A coal feeding device for a CFB boiler coal bunker according to claim 2, characterized in that: The sealing member (8) has a slot (10) at one end facing the blockage switch detector (6), and the limiting member (7) has a spherical part (15) at one end extending into the mounting hole (16). The sealing member (8) has a beveled part (11) at the position corresponding to the slot (10) that can cooperate with the spherical part (15).

4. A coal feeding device for a CFB boiler coal bunker according to claim 3, characterized in that: At least two slots (10) are evenly arranged around the circumference of the mounting plug (8).

5. A CFB boiler coal bunker feeding device according to any one of claims 2-4, characterized in that: The mounting base (5) is provided with a threaded hole (14) for installing the limiting member (7). The threaded hole (14) is connected to the mounting hole (16). The limiting member (7) is provided with an external thread that mates with the threaded hole (14).

6. A coal feeding device for a CFB boiler coal bunker according to claim 5, characterized in that: The mounting base (5) is provided with a sliding groove (13) at the position corresponding to the mounting hole (16). At least two sliding grooves (13) are provided at intervals along the circumference of the mounting hole (16). Each sliding groove (13) is connected to the mounting hole (16). The sealing member (8) is provided with a slider (9) that slides in cooperation with the sliding groove (13).

7. A coal feeding device for a CFB boiler coal bunker according to claim 5, characterized in that: The sealing element (8) has a conical end (12) at one end facing the coal bunker (2).

8. A coal feeding device for a CFB boiler coal bunker according to claim 5, characterized in that: The sealing component (8) is a hollow structural component.

Images