A core tube for air distribution plate

Abstract

A core tube for an air distribution plate belongs to the technical field of fluidized air distribution. It comprises an upper core tube of an integral structure and a lower core tube for passing through the air distribution plate; the upper core tube is provided with an air outlet, the lower core tube is provided with an air inlet, and the cross section of the lower core tube is non-circular. The upper core tube of the present invention adopts a circular cross section structure to adapt to the existing hood structure, and the lower core tube adopts a non-circular cross section structure to obtain a larger flow area under the condition of narrow cooling tube spacing.

Description

Technical Field

[0001] The invention relates to the technical field of fluidized air distribution, and in particular to a core tube used on an air distribution plate. Background Art

[0002] The existing circulating fluidized bed hood arrangement scheme has the advantages of sufficient momentum, large spacing, and low wear. Since a single hood requires a large amount of air, the flow area of ​​the core tube connected to it is required to be as large as possible. Therefore, the current core tubes all adopt a circular cross-section structure. However, in many designed air distribution plate structures, since the cooling tube spacing is too small, the too thick core tube cannot pass through the air distribution plate, which limits the flow area of ​​the core tube, so that the core tube and the hood matching the core tube cannot be made very large. In order to ensure the opening rate of the air distribution plate, the number of hoods can only be increased. However, the overly dense arrangement of the hoods will lead to a decrease in the momentum of the single hood, easy wear, reduced ability to blow large-particle ash, reduced fluidity of large-particle ash and debris, and uneven distribution of materials, oxygen content, and bed temperature on the air distribution plate, which in turn causes disadvantages such as high local bed temperature and high nitrogen oxides. Therefore, there is an urgent need for a core tube that can obtain a larger flow area under the condition of narrow cooling tube spacing. Summary of the invention

[0003] In order to solve the problem that the existing core tube structure cannot meet the flow area requirement under the condition of narrow cooling tube intervals, the present invention provides a core tube for an air distribution plate.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a core tube used on an air distribution plate, comprising an upper core tube portion of an integrated structure and a lower core tube portion for passing through the air distribution plate; the upper core tube portion is provided with an air outlet, the lower core tube portion is provided with an air inlet, and the cross-section of the lower core tube portion is non-circular.

[0005] Furthermore, the cross-section of the upper portion of the core tube is circular, and the cross-section of the lower portion of the core tube is rectangular.

[0006] Furthermore, the cross-section of the upper portion of the core tube is circular, and the cross-section of the lower portion of the core tube is a geometric figure whose length is greater than its width.

[0007] Furthermore, the cross-section of the lower portion of the core tube is elliptical.

[0008] Furthermore, the cross-section of the lower portion of the core tube is rhombus-shaped.

[0009] Furthermore, a special-shaped transition portion for connecting the upper and lower parts of the core tube is provided between the upper and lower parts of the core tube, and the cross section of the special-shaped transition portion is a shape formed by concentrically superimposing the cross section of the upper part of the core tube and the cross section of the lower part of the core tube in the same virtual plane.

[0010] Furthermore, the top of the portion of the lower portion of the core tube that protrudes compared to the upper portion of the core tube is closed, and the side wall of the lower portion of the core tube is provided with a smooth protrusion for connecting to the upper portion of the core tube.

[0011] Furthermore, the upper part of the core tube and the lower part of the core tube are connected in a lofting transition manner.

[0012] Furthermore, the upper part of the core tube and the lower part of the core tube are connected via a bent horizontal plane.

[0013] Furthermore, the ratio of the cross-sectional area of ​​the lower portion of the core tube to the cross-sectional area of ​​the upper portion of the core tube is 1:0.3 to 1:5.0.

[0014] The beneficial effects of the present invention are as follows: the core tube upper portion adopts a circular cross-section structure to adapt to the existing hood structure, and the core tube lower portion adopts a non-circular cross-section structure to obtain a larger flow area under the condition of narrow cooling tube spacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the hood after installation according to Embodiment 1 of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0017] Figure 3 This is a front cross-sectional view of the hood after installation in Example 1 of the present invention;

[0018] Figure 4 is a side sectional view of embodiment 1 of the present invention;

[0019] Figure 5 It is a cross-sectional view of the lower portion of the core tube of Example 1 of the present invention;

[0020] Figure 6 This is a schematic diagram of the structure of the hood after installation according to Embodiment 2 of the present invention;

[0021] Figure 7 It is a side sectional view of the hood after installation of Example 2 of the present invention;

[0022] Figure 8 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0023] Fig. 9 It is a front cross-sectional view of embodiment 2 of the present invention;

[0024] Fig.10 It is a cross-sectional view of the special-shaped transition portion of Example 2 of the present invention;

[0025] Fig.11 This is a schematic diagram of the structure of the hood after installation according to Embodiment 3 of the present invention;

[0026] Fig.12This is a cross-sectional view of the hood after installation according to Embodiment 3 of the present invention;

[0027] Fig.13 This is a schematic diagram of the structure of the hood after installation according to Embodiment 4 of the present invention;

[0028] Fig.14 This is a front cross-sectional view of the hood after installation of Example 4 of the present invention;

[0029] Fig.15 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0030] Fig.16 is a side sectional view of embodiment 4 of the present invention;

[0031] Fig.17 This is a schematic diagram of the structure of Embodiment 5 of the present invention;

[0032] Fig.18 is a front cross-sectional view of embodiment 5 of the present invention;

[0033] Fig.19 is a side sectional view of embodiment 5 of the present invention;

[0034] Fig. 20 AA cross-sectional view of Embodiment 5 of the present invention;

[0035] Fig.21 It is a front view of the hood after installation of Example 6 of the present invention;

[0036] Fig. 22 is a cross-sectional view of the hood after installation according to Embodiment 6 of the present invention;

[0037] Fig.23 This is a cross-sectional view of the lower portion of the core tube of Example 6 of the present invention;

[0038] Fig.24 This is a front view of the hood after installation according to Embodiment 7 of the present invention;

[0039] Fig.25 is a cross-sectional view of the hood after installation according to Embodiment 7 of the present invention;

[0040] Fig.26 This is a cross-sectional view of the lower portion of the core tube of Example 7 of the present invention.

[0041] In the figure, 1. hood, 2. core tube, 3. connecting plane, 4. smooth protrusion, 5. lower part of core tube, 6. upper part of core tube, 7. ventilation hole, 8. sealing ring, 9. support plate, 10. special-shaped transition part, 11. outer edge. DETAILED DESCRIPTION

[0042] Example 1

[0043] like Figure 1-Figure 5As shown, the core tube 2 of this embodiment includes an integrated core tube upper part 6 and a core tube lower part 5; the core tube upper part 6 is a structure with a circular cross-section, and the top of the core tube upper part 6 is provided with an air outlet with the same shape as the circular cross-section; the core tube lower part 5 of the core tube 2 is a structure with a rounded rectangular cross-section, and the bottom of the core tube lower part 5 is an air inlet with the same cross-section as the rounded rectangular cross-section; the length of the rounded rectangle is greater than the diameter of the circle and greater than the width of the rounded rectangle, and the top of the part of the core tube lower part 5 protruding from the core tube upper part 6 is provided with a connecting plane 3, and the connecting plane 3 is connected to the rounded corners of the side wall of the core tube lower part 5, and the side walls of the core tube lower part 5 on both sides in the width direction are provided with smooth protrusions 4, and the smooth protrusions 4 are curved surface structures protruding outward from the side walls of the core tube lower part 5, and the top of the curved surface is connected to the part of the core tube upper part 6 protruding from the core tube lower part 5;

[0044] The hood 1 matched with the core tube 2 adopts a bell-shaped type, the upper part 6 of the core tube extends into the hood 1, and there is a space connected with the air outlet between the upper part 6 of the core tube and the hood 1, and a blocking ring 8 is provided at the bottom of the space, the blocking ring 8 is welded to the outside of the upper part 6 of the core tube, and the blocking ring 8 is threadedly connected to the hood 1, the connecting plane 3 supports the hood 1, and a plurality of ventilation holes 7 are provided on the side wall of the hood 1;

[0045] The lower part 5 of the core tube is the part of the core tube inserted into the air distribution plate, and its rear end may be provided with other parts according to actual conditions. The shape of the other parts may be consistent with the lower part 5 of the core tube, or may be restored to a circular shape.

[0046] Example 2

[0047] like Figure 6-Figure 10 As shown, the core tube of the present embodiment is an integral structure, and is divided into an upper core tube portion, a special-shaped transition portion 10 and a lower core tube portion from top to bottom; the upper core tube portion is a structure with a circular cross section, and a top plate is provided on the top, a small hole is provided in the center of the top plate, and a plurality of small holes are provided at the upper end of the side wall of the upper core tube portion, and the above-mentioned small holes are all used as air outlets; the lower core tube portion is a structure with a rounded rectangular cross section, and its bottom is an air inlet with the same cross section as the rounded rectangular cross section; the length of the rounded rectangle is greater than the diameter of the circle and greater than the width of the rounded rectangle, and the cross section of the special-shaped transition portion 10 is a shape formed by superimposing the circular cross section of the upper core tube portion and the rounded rectangle cross section of the lower core tube portion in a concentric manner in the same virtual plane, as shown in FIG. Fig.10 As shown, it includes four curved parts, wherein the two curved parts located in the length direction are upward extensions of the side wall of the lower part of the core tube, and the tops of the two curved parts in the length direction are bent inwards and connected to the upper part of the core tube, and the two curved parts located in the width direction are downward extensions of the side wall of the upper part of the core tube, and the bottoms of the two curved parts in the width direction are bent inwards and connected to the lower part of the core tube; the core tube is also provided with a support plate 9, and the plane where the tops of the two curved parts in the length direction are bent inwards and are located in the same virtual plane as the support plate 9;

[0048] The hood matched with the above-mentioned core tube adopts a bell-shaped type. The hood is placed on a support plate 9, and the upper part of the core tube extends into the hood. The bottom of the hood protrudes inward to form a limit platform. The inner wall of the limit platform fits with the upper part of the core tube, and there is a space connected to the air outlet between the part above the hood limit platform and the upper part of the core tube. The side wall of the hood is provided with multiple ventilation holes connecting the outside world with the above-mentioned space.

[0049] Example 3

[0050] like Fig.11 and Fig.12 As shown, the core tube of the present embodiment comprises an integrated core tube upper portion and a core tube lower portion; the core tube upper portion is a structure with a circular cross-section, and a top plate is provided on the top, and a plurality of small holes are provided at the upper end of its side wall as air outlets; the core tube lower portion is a structure with a rounded rectangular cross-section, and its bottom is an air inlet with the same cross-section as the rounded rectangular cross-section; a support plate is provided between the core tube upper portion and the core tube lower portion, the core tube upper portion is bent inwardly relative to the bottom of the protruding portion of the core tube lower portion to form a plane A for connecting the core tube upper portion and the core tube lower portion, the core tube lower portion is bent inwardly relative to the top of the protruding portion of the core tube upper portion to form a plane B for connecting the core tube upper portion and the core tube lower portion, and plane A, plane B and the support plate are located in the same virtual plane;

[0051] The hood matched with the core tube adopts a bell-shaped type. The hood is placed on a support plate. An outer edge 11 is provided at the bottom of the hood. The outer edge 11 surrounds the support plate. A boss is provided at the connection between the support plate and the upper part of the core tube. The boss and the upper part of the core tube are both located inside the hood. The outer edge 11 and the boss limit the hood. There is a space connected to the air outlet between the hood and the upper part of the core tube. The side wall of the hood is provided with multiple ventilation holes connecting the outside world with the above-mentioned space.

[0052] Example 4

[0053] like Fig.13 and Fig.16 As shown, the core tube of this embodiment includes an integrated core tube upper part and a core tube lower part; the core tube upper part is a structure with a circular cross-section, and a top plate is provided on the top, and a plurality of small holes are provided at the upper end of its side wall as air outlets; the core tube lower part is a structure with a rounded rectangular cross-section, and its bottom is an air inlet with the same rounded rectangular cross-section; the cross-sectional length of the core tube lower part is greater than the cross-sectional diameter of the core tube upper part, which is greater than the cross-sectional width of the core tube lower part, the core tube upper part and the core tube lower part are connected in a lofting transition manner, and a sealing ring 8 is welded at the lower end of the core tube upper part, and the sealing ring 8 is provided with an external thread, and the sealing ring 8 can be directly welded to the side wall of the core tube upper part, and can also be welded to the boss provided on the core tube upper part;

[0054] The hood matched with the core tube adopts a bell-shaped type. The lower end of the inner wall of the hood is provided with an internal thread threadedly connected to the sealing ring 8. There is a space connected to the air outlet between the part above the internal thread of the hood and the upper part of the core tube. The side wall of the hood is provided with multiple ventilation holes connecting the outside world with the above space.

[0055] Example 5

[0056] like Figure 17-Figure 20 As shown, the core tube of this embodiment includes an integrated core tube upper part and a core tube lower part; the core tube upper part is a structure with a circular cross-section, and a top plate is provided on the top, a small hole is provided in the center of the top plate, and a plurality of small holes are provided at the upper end of the side wall of the upper part of the core tube, and the above-mentioned small holes are all used as air outlets; the core tube lower part is a structure with a rounded rectangular cross-section, and its bottom is an air inlet with the same cross-section as the rounded rectangular cross-section; the length of the rounded rectangle is equal to the diameter of the circle, and the protruding part of the core tube upper part compared to the core tube lower part is bent inward at the bottom, so that the side walls of the core tube upper part and the core tube lower part are connected; the core tube is also provided with a support plate for placing a hood, and a circle of bosses for limiting the hood are provided at the connection between the support plate and the side wall of the upper part of the core tube, and a plurality of clamps are also extended from the side wall of the support plate, and the clamps are used to extend into the clamping groove between the two adjacent outer edges corresponding to the bottom of the hood, so as to limit the hood.

[0057] Example 6

[0058] like Figure 21-23 As shown, the difference between this embodiment and embodiment 4 is that the lower part of the core tube is a structure with a diamond-shaped cross section.

[0059] Example 7

[0060] like Figure 24-26 As shown, the difference between this embodiment and embodiment 4 is that the lower part of the core tube is a structure with an elliptical cross-section.

[0061] The cross-sections of the lower portion of the core tube in Examples 1 to 7 are all geometric figures in which the length is greater than the width. The width is used to ensure that it can be installed between cooling tubes with narrow intervals, and the length is used to ensure that a larger flow area is obtained. In addition, the cross-section of the lower portion of the core tube can also be a square in a rectangle. The flow area of ​​the square structure is 25%-30% larger than that of the circular structure. It can also be used between cooling tubes with narrow intervals to obtain a larger flow area. The ratio of the cross-sectional area of ​​the lower portion of the core tube to the cross-sectional area of ​​the upper portion of the core tube can achieve better results in the range of 1:0.3 to 1:5.0.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A core tube for a wind distribution plate, characterized in that: It comprises an upper core tube portion of an integral structure and a lower core tube portion for passing through an air distribution plate; the upper core tube portion is provided with an air outlet, the lower core tube portion is provided with an air inlet, and the cross-section of the lower core tube portion is non-circular; the cross-section of the upper core tube portion is circular, and the cross-section of the lower core tube portion is a geometric figure in which the length is greater than the width; the cross-section of the lower core tube portion is rectangular, elliptical or diamond-shaped; a special-shaped transition portion for connecting the upper core tube portion and the lower core tube portion is provided between the upper core tube portion and the lower core tube portion, and the cross-section of the special-shaped transition portion is a shape formed by superimposing the cross-section of the upper core tube portion and the cross-section of the lower core tube portion in a concentric manner in the same virtual plane; the ratio of the cross-sectional area of ​​the lower core tube portion to the cross-sectional area of ​​the upper core tube portion is 1:0.3 to 1:5.

0.

2. The core tube for the air distribution plate according to claim 1, characterized in that: The top of the portion of the lower part of the core tube protruding compared to the upper part of the core tube is closed, and the side wall of the lower part of the core tube is provided with a smooth protrusion for connecting to the upper part of the core tube.

3. The core tube for the air distribution plate according to claim 1, characterized in that: The upper part of the core tube and the lower part of the core tube are connected in a lofting transition manner.

4. The core tube for the air distribution plate according to claim 1, characterized in that: The upper part of the core tube and the lower part of the core tube are connected through a bent horizontal plane.

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