Feeding structure and circulating fluidized bed boiler

Abstract

The feeding structure comprises a feeding pipe and a sealing air pipe, the feeding pipe comprises a feeding section and a feeding section which are communicated with each other, one end, far away from the feeding section, of the feeding section is provided with a feeding port, the top of the pipe wall of the feeding section is provided with a sealing air port, and the sealing air port is communicated with the feeding section. The sealing air pipe comprises an air inlet section and an air outlet section which are communicated, an air inlet is formed in the end, away from the air outlet section, of the air inlet section, an air outlet is formed in the end, away from the air inlet section, of the air outlet section, and the air outlet is communicated with the sealing air opening. The included angle between the side, facing the feeding section, of the air outlet section and the feeding section is larger than 90 degrees, and the air outlet is in a flat opening shape extending in the circumferential direction of the feeding section. According to the feeding structure, the effective blowing range of sealing air can be enlarged, and smoke in a boiler hearth can be prevented from entering the feeding section from the feeding section, so that the problem of smoke return during feeding is solved, and the field environment and the equipment operation stability are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circulating fluidized bed boilers, and in particular relates to a feeding structure and a circulating fluidized bed boiler. Background Art

[0002] The feed port of the biomass circulating fluidized bed boiler is generally located in the dense phase area, and a sealing air system needs to be set to keep it in a positive pressure state. However, due to the unevenness of the feed, the feeding structure in front of the furnace has long had a serious problem of positive pressure smoke return, causing the silo to be filled with smoke for a long time, making it impossible to effectively observe the actual material level in the silo, seriously affecting the on-site environment and the stability of equipment operation.

[0003] This shows that the existing furnace feeding structure still needs to be improved. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a feeding structure and a circulating fluidized bed boiler, wherein the feeding structure can increase the effective blowing range of the sealing wind without reducing the wind pressure of the sealing wind, which is conducive to preventing the smoke in the boiler furnace from entering the feeding section from the feeding section, thereby helping to solve the problem of feeding smoke return and improving the stability of the on-site environment and equipment operation.

[0005] In the first aspect of the present utility model, the present utility model proposes a feeding structure. According to an embodiment of the present utility model, the feeding structure comprises:

[0006] A feed pipe, the feed pipe comprising a feed section and a feed section connected to each other, the end of the feed section away from the feed section having a feed port, a sealed air port being provided on the top of the tube wall of the feed section, the end of the feed section away from the feed section being inclined downward and connected to the boiler furnace;

[0007] A sealed air duct, the sealed air duct comprises an air inlet section and an air outlet section which are connected, the air inlet section has an air inlet at one end away from the air outlet section, the air outlet has an air outlet at one end away from the air inlet section, the air outlet is connected to the sealed air port, the angle between the side of the air outlet section facing the feeding section and the feeding section is greater than 90°, and the shape of the air outlet is a flat mouth extending along the circumferential direction of the feeding section.

[0008] According to the feeding structure of the above-mentioned embodiment of the utility model, by connecting the air outlet of the air outlet section in the sealed air duct with the sealed air outlet arranged on the top of the tube wall of the feeding section in the feeding pipe, and making the angle between the side of the air outlet section facing the feeding section and the feeding section greater than 90°, the sealed air can enter the air inlet section from the air inlet, then enter the feeding section through the air outlet section obliquely downward, and then enter the feeding section through the feeding section. This is beneficial to blowing the material supplied to the feeding pipe to prevent material accumulation, thereby improving the feeding efficiency and feeding uniformity, and at the same time, it is beneficial to prevent the flue gas in the boiler furnace from entering the feeding section from the feeding section, and the shape of the air outlet is set to be a flat mouth extending along the circumferential direction of the feeding section. Compared with a circular air outlet with the same area, it can increase the effective blowing range of the sealed air without reducing the wind pressure of the sealed air, and further helps to prevent the flue gas in the boiler furnace from entering the feeding section from the feeding section, thereby helping to solve the problem of feeding smoke return and improve the stability of the on-site environment and equipment operation.

[0009] In addition, the feeding structure according to the above embodiment of the utility model may also have the following additional technical features:

[0010] In some embodiments of the present invention, the angle between the center line of the feed section and the center line of the feeding section is 110°-145°.

[0011] In some embodiments of the present invention, the cross-section of the feed section is U-shaped or rectangular.

[0012] In some embodiments of the present invention, the cross-section of the air outlet section is rectangular, and along the direction from one end of the air outlet section close to the air inlet section to the air outlet, the cross-sectional width of the air outlet section gradually decreases, and the cross-sectional length of the air outlet section gradually increases.

[0013] In some embodiments of the present invention, the center line of the air outlet section is parallel to the center line of the feeding section.

[0014] In some embodiments of the present invention, an extension line of the center line of the air outlet section passes through the feeding section.

[0015] In some embodiments of the present invention, the shape of the air outlet is rectangular, and the ratio of the length and width of the air outlet is (3-8):1.

[0016] In some embodiments of the present invention, the ratio of the length of the air outlet to the width of the feed section is (0.8-1):1.

[0017] In some embodiments of the present invention, the feeding structure further includes a material broadcasting air duct, and the material broadcasting air duct is connected to a side of the feeding section close to the feeding section.

[0018] In some embodiments of the utility model, the feeding structure also includes a fire watching tube, which is connected to the air outlet section, and a fire watching hole is provided at one end of the fire watching tube away from the air outlet section, and an extension line of the center line of the feeding section passes through the fire watching hole.

[0019] In the second aspect of the utility model, the utility model proposes a circulating fluidized bed boiler. According to the embodiment of the utility model, the circulating fluidized bed boiler has the feeding structure described in the above embodiment. Therefore, through the feeding structure, the effective blowing range of the sealing wind can be increased without reducing the wind pressure of the sealing wind, which is conducive to preventing the flue gas in the boiler furnace from entering the feeding section from the feeding section, thereby helping to solve the problem of feeding smoke return and improve the stability of the on-site environment and equipment operation.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a feeding structure according to an embodiment of the utility model;

[0023] Figure 2 is a front view of a feeding structure according to an embodiment of the utility model;

[0024] Figure 3 is a side view of a feeding structure according to an embodiment of the utility model;

[0025] Figure 4 is a schematic diagram of the cross-sectional structure of an air outlet section according to an embodiment of the utility model;

[0026] Figure 5 is a schematic diagram of a feeding structure according to another embodiment of the utility model;

[0027] Figure 6 It is a front view of a feeding structure according to another embodiment of the utility model.

[0028] Reference numerals:

[0029] 10-feeding pipe; 11-feeding section; 111-feeding port; 12-feeding section; 20-sealed air duct; 21-air inlet section; 211-air inlet; 22-air outlet section; 221-air outlet; 30-support; 40-broadening air duct; 50-fire watching pipe. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] 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 utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect 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.

[0035] In the first aspect of the present utility model, the present utility model proposes a feeding structure. According to an embodiment of the present utility model, referring to Figure 1-Figure 3 The feeding structure includes: a feeding pipe 10 and a sealed air duct 20. The feeding pipe 10 includes a connected feeding section 11 and a feeding section 12. The end of the feeding section 11 away from the feeding section 12 has a feeding port 111. The top of the tube wall of the feeding section 11 is provided with a sealed air port (not shown). The end of the feeding section 12 away from the feeding section 11 is tilted downward and connected to the boiler furnace (not shown). The sealed air duct 20 includes a connected air inlet section 21 and an air outlet section 22. The end of the air inlet section 21 away from the air outlet section 22 has an air inlet 211. The end of the air outlet section 22 away from the air inlet section 21 has an air outlet 221. The air outlet 221 is connected to the sealed air port. The angle between the side of the air outlet section 22 facing the feeding section 12 and the feeding section 11 is greater than 90°, and the shape of the air outlet 221 is a flat mouth extending along the circumferential direction of the feeding section 11.

[0036] According to the feeding structure of the above embodiment of the utility model, by connecting the air outlet 221 of the air outlet section 22 in the sealed air duct 20 with the sealed air outlet arranged on the top of the tube wall of the feeding section 11 in the feeding pipe 10, and at the same time making the angle between the side of the air outlet section 22 facing the feeding section 12 and the feeding section 11 greater than 90°, the sealed air can enter the air inlet section 21 from the air inlet 211, then enter the feeding section 11 obliquely downward through the air outlet section 22, and then enter the feeding section 12 through the feeding section 11, thereby facilitating the blowing of the material supplied to the feeding pipe 10, and preventing the material from Accumulation, thereby improving the feeding efficiency and feeding uniformity, and at the same time is beneficial to preventing the flue gas in the boiler furnace from entering the feeding section 11 from the feeding section 12, and the shape of the air outlet 221 is set to be a flat mouth extending along the circumferential direction of the feeding section 11. Compared with the circular air outlet with the same area, it can increase the effective blowing range of the sealing wind without reducing the wind pressure of the sealing wind, thereby further preventing the flue gas in the boiler furnace from entering the feeding section 11 from the feeding section 12, thereby helping to solve the problem of feeding smoke return and improve the stability of the on-site environment and equipment operation.

[0037] It should be noted that the connection method between the feed pipe 10 and the sealed air duct 20 is not particularly limited, and those skilled in the art can select it according to actual needs, for example, a welding connection method can be adopted. Furthermore, a support member 30 (such as a support plate) can be provided between the feed pipe 10 and the sealed air duct 20, so that the support member 30 can play a role in supporting the sealed air duct 20, thereby facilitating the improvement of the stability of the sealed air duct 20.

[0038] According to some specific embodiments of the present invention, Figure 2, the angle between the center line a of the feed section 11 and the center line b of the feed section 12 is 110°-145°, for example, it can be 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, etc. Thus, a suitable angle can be formed between the feed section 11 and the feed section 12, which is beneficial for the material in the feed section 11 to fall into the boiler furnace along the feed section 12, thereby facilitating the improvement of the feeding efficiency.

[0039] It should be noted that the cross-sectional shape of the feed section 11 is not particularly limited, and those skilled in the art can select it according to the material properties or the interface form of the pre-furnace feeding equipment. For example, a U-shape or a rectangular shape can be adopted.

[0040] According to some further specific embodiments of the present invention, referring to Figure 4 The cross-sectional shape of the air outlet section 22 can be rectangular, and along the direction from one end of the air outlet section 22 close to the air inlet section 21 to the air outlet 221, the cross-sectional width e of the air outlet section 22 gradually decreases, and the cross-sectional length f of the air outlet section 22 gradually increases. Thus, while not reducing the air pressure of the sealing air, it is further beneficial to increase the effective blowing range of the sealing air, thereby facilitating the prevention of the flue gas in the boiler furnace from the feeding section 12 into the feeding section 11, and further facilitating the solution of the problem of the feeding smoke return, and improving the stability of the on-site environment and the operation of the equipment.

[0041] According to some specific embodiments of the present invention, Figure 2 , the center line c of the air outlet section 22 is parallel to the center line b of the feeding section 12. This is beneficial to further increase the effective blowing range of the sealed air, thereby preventing the flue gas in the boiler furnace from entering the feeding section 11 from the feeding section 12, and further beneficial to solving the problem of feeding smoke return, improving the on-site environment and the stability of equipment operation. Furthermore, the extension line of the center line c of the air outlet section 22 runs through the feeding section 12.

[0042] According to some other specific embodiments of the utility model, the shape of the air outlet 221 is rectangular, and the ratio of the length f1 and the width e1 of the air outlet 221 is (3-8):1, for example, it can be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, etc. Therefore, compared with a circular air outlet with the same area, the effective blowing range of the sealing wind can be further increased without reducing the wind pressure of the sealing wind, which is conducive to preventing the smoke in the boiler furnace from entering the feeding section 11 from the feeding section 12, and further helps to solve the problem of smoke return from feeding, and improve the stability of the on-site environment and equipment operation.

[0043] Furthermore, the area of ​​the air outlet 221 can be selected according to the required sealing wind pressure.

[0044] According to some specific embodiments of the present invention, the ratio of the length f1 of the air outlet 221 to the width g of the feed section 11 is (0.8-1):1, for example, it can be 0.8:1, 0.85:1, 0.9:1, 0.95:1, 1:1, etc. This is conducive to further increasing the effective blowing range of the sealed wind, thereby facilitating the prevention of the flue gas in the boiler furnace from entering the feed section 11 from the feed section 12, thereby facilitating the solution of the problem of smoke return from the feed, and improving the stability of the on-site environment and equipment operation.

[0045] According to some specific embodiments of the present invention, Figure 5 The feeding structure further includes a broadcasting air duct 40, which is connected to the side of the feeding section 12 close to the feeding section 11. Thus, the broadcasting air can enter the feeding section 12 through the broadcasting air duct 40 and evenly spread the material to prevent material accumulation, thereby improving the feeding efficiency and feeding uniformity.

[0046] It should be noted that the connection method between the broadcasting air duct 40 and the feeding section 12 is not particularly limited, and those skilled in the art can select it according to actual needs, for example, welding connection can be adopted.

[0047] According to some specific embodiments of the present invention, Figure 6 The feeding structure further includes a fire-watching tube 50, which is connected to the air outlet section 22. A fire-watching hole (not shown) is provided at one end of the fire-watching tube 50 away from the air outlet section 22, and an extension line of the center line b of the feeding section 12 passes through the fire-watching hole. Thus, the flame in the furnace of the boiler can be observed through the fire-watching hole, and at the same time, whether there is material accumulation in the feeding section 12 can be observed through the fire-watching hole.

[0048] It should be noted that the connection method between the fire-viewing tube 50 and the sealed air duct 20 is not particularly limited, and those skilled in the art can choose it according to actual needs, for example, welding connection can be adopted.

[0049] In the second aspect of the utility model, the utility model proposes a circulating fluidized bed boiler. According to the embodiment of the utility model, the circulating fluidized bed boiler has the feeding structure of the above embodiment. Therefore, through the feeding structure, the effective blowing range of the sealing wind can be increased without reducing the wind pressure of the sealing wind, which is conducive to preventing the flue gas in the boiler furnace from entering the feeding section from the feeding section, thereby helping to solve the problem of feeding smoke return and improve the stability of the on-site environment and equipment operation.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A feeding structure, characterized in that: include: A feed pipe, the feed pipe comprising a feed section and a feed section connected to each other, the end of the feed section away from the feed section having a feed port, a sealed air port being provided on the top of the tube wall of the feed section, the end of the feed section away from the feed section being inclined downward and connected to the boiler furnace; A sealed air duct, the sealed air duct comprises an air inlet section and an air outlet section which are connected, the air inlet section has an air inlet at one end away from the air outlet section, the air outlet has an air outlet at one end away from the air inlet section, the air outlet is connected to the sealed air port, the angle between the side of the air outlet section facing the feeding section and the feeding section is greater than 90°, and the shape of the air outlet is a flat mouth extending along the circumferential direction of the feeding section.

2. The feeding structure according to claim 1, characterized in that: The angle between the center line of the feed section and the center line of the feeding section is 110°-145°.

3. The feeding structure according to claim 1, characterized in that: The cross section of the feeding section is U-shaped or rectangular.

4. The feeding structure according to claim 1, characterized in that: The cross section of the air outlet section is rectangular, and along the direction from one end of the air outlet section close to the air inlet section to the air outlet, the cross-sectional width of the air outlet section gradually decreases, and the cross-sectional length of the air outlet section gradually increases.

5. The feeding structure according to claim 4, characterized in that: The center line of the air outlet section is parallel to the center line of the feeding section; And / or, an extension line of the center line of the air outlet section passes through the feeding section.

6. The feeding structure according to claim 1, characterized in that: The shape of the air outlet is rectangular, and the ratio of the length to the width of the air outlet is (3-8):

1.

7. The feeding structure according to claim 6, characterized in that: The ratio of the length of the air outlet to the width of the feeding section is (0.8-1):

1.

8. The feeding structure according to claim 1, characterized in that: It also includes a material broadcasting air duct, which is connected to a side of the feeding section close to the feeding section.

9. The feeding structure according to claim 1, characterized in that: It also includes a fire watching tube, which is connected to the air outlet section. One end of the fire watching tube away from the air outlet section is provided with a fire watching hole, and the extension line of the center line of the feeding section passes through the fire watching hole.

10. A circulating fluidized bed boiler, characterized in that: The circulating fluidized bed boiler has the feeding structure according to any one of claims 1-9.

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