A boiler tube row fixing method and device

Abstract

The present invention discloses a method for fixing a boiler tube row, including short-circuiting the outermost circle tubes at a specified position of the tube panel at a specific position, connecting a cold clamp tube tee at the cut of the outermost circle tube, clamping the tube panel by first separating and then joining the heating surface tube, and welding a comb plate on the horizontal section of the cold clamp tube branch. The present invention also discloses a boiler tube row fixing device, including a cold clamp tube tee, the cold clamp tube tee includes a three-pronged pipe and two cold clamp tube branches, one end of the cold clamp tube branch is fixedly connected to form a connecting part, and an accommodating part for the tube row to pass through is formed between the two cold clamp tube branches, one end of the three-pronged pipe is fixedly connected to the connecting part, and is located on the same horizontal line as the accommodating part. The present invention realizes fixing the tube row with the cold clamp tube tee because the tube row passes through the accommodating part and the three-pronged pipe between the cold clamp tube branches, and by arranging a comb plate on the cold clamp tube branch, the tubes on the tube row are prevented from being out of the row, thereby improving the safety and reliability of the heating surface of the boiler in the thermal power plant.

Description

Technical Field

[0001] The invention relates to the field of boilers in thermal power plants, and in particular to a method and a device for fixing a boiler tube bank. Background Art

[0002] In thermal power plants, welded round steel and sliders are used to position the tubes in the high-temperature superheater and high-temperature reheater tube panels on the boiler. When hot, the uneven heat load of the boiler causes uneven cooling and heating of the tubes and different expansion. A large number of tube clamps are pulled off and the tubes are removed from the queue. The removed tubes absorb more heat and wear more, causing overheating and wear and tear, and are prone to coking at the removed tubes.

[0003] To solve the above problems, heat-resistant steel clamps are used to fix the tube screens to fix the boiler tube rows and prevent the tubes from falling out of the row. However, due to the high temperature working environment of 1000℃ and the absence of cooling medium, the heat-resistant steel clamps have the problems of insufficient strength and easy burning during use, resulting in poor fixing effect, short life and high cost. Summary of the invention

[0004] In view of the above-mentioned deficiencies, the object of the present invention is to provide a method and device for fixing a boiler tube row, by which each panel of tubes is fixed by a cold clamp tube tee, thereby improving the reliability of the tube slider of the high-temperature heating surface tube panel and preventing the tubes from being easily removed from the row, thereby improving the safety and reliability of the heating surface of the boiler in a thermal power plant.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A method for fixing a boiler tube bank comprises the following steps:

[0007] S1: Cut and short-circuit the outermost tubes at the specified position of the tube panel at a specific position;

[0008] S2: The cut part of the outermost pipe is connected to a cold clamp pipe tee;

[0009] S3: Clamp the tube panel by first opening and then closing the heating surface tube;

[0010] S4: Weld a comb plate that matches the pitch and diameter of the fixed tube row on the horizontal section of the cold clamp tube branch.

[0011] Preferably, the designated position of the tube panel is higher than the inlet section, higher than the outlet section and higher than the bottom of the panel.

[0012] Preferably, the fixed position of the cold clamp tube tee is determined according to flow distribution.

[0013] Preferably, the flow distribution is related to resistance and heating conditions.

[0014] Preferably, the resistance of the outermost circle of tubes before and after short-circuiting needs to remain consistent, and the heating condition is iteratively determined in combination with thermal calculation and wall temperature calculation results.

[0015] A boiler tube row fixing device comprises a cold clamp tube tee, the cold clamp tube tee comprises a three-pronged pipe and two cold clamp tube branches, one end of the cold clamp tube branch is fixedly connected to form a connecting portion, and an accommodating portion for the tube row to pass through is formed between the two cold clamp tube branches, one end of the three-pronged pipe is fixedly connected to the connecting portion at the connection of the two cold clamp tube branches, and the three are interconnected, the three-pronged pipe and the accommodating portion are located on the same horizontal line, and the tube row passes through the three-pronged pipe.

[0016] Preferably, the cold clamp pipe branches are arranged parallel to each other.

[0017] Preferably, a comb plate matching the tube row pitch and tube diameter is welded on the horizontal section of the cold clamp tube branch.

[0018] Preferably, a sliding block is provided between the tube rows.

[0019] The beneficial effects of the present invention are as follows: since the tube row passes through the accommodating portion between the two cold clamp tube branches and passes through the three-way pipe, the tube row is fixed on the cold clamp tube tee, and a comb plate is arranged on the cold clamp tube branch to prevent the tubes on the tube row from being out of the row, thereby improving the safety and reliability of the heating surface of the boiler in a thermal power plant.

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a structural diagram of the cold clamp pipe tee of the present invention;

[0023] Figure 2 It is a structural diagram of the pipe arrangement of the present invention on the cold clamp pipe tee;

[0024] Figure 3 yes Figure 2 Middle A-plane sectional view;

[0025] Figure 4 yes Figure 2 A top view of

[0026] Figure 5 yes Figure 1 Structural diagram of intercooler clamp pipe branch;

[0027] Figure 6 yes Figure 5Top view of the .

[0028] The descriptions of the reference numerals in the figures are as follows.

[0029] Cold clamp pipe tee—1, three-fork pipe—11, cold clamp pipe branch—12, connecting part—13, pipe row—2, accommodating part—3, comb plate—4, slider—5. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the implementation methods and the accompanying drawings.

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention.

[0032] Embodiment 1:

[0033] A method for fixing a boiler tube bank comprises the following steps:

[0034] S1: S1: Cut and short-circuit the outermost tubes at the specified position of the tube panel at a specific position;

[0035] S2: The cutting part of the outermost pipe is connected to the cold clamp pipe tee 1;

[0036] S3: Clamp the heating surface tubes by first opening and then closing the tube panel.

[0037] S4: A comb plate 4 matching the pitch and diameter of the fixed tube row 2 is welded on the horizontal section of the cold clamp tube branch 12.

[0038] The designated positions of the tube screen are higher than the inlet section, higher than the outlet section and higher than the bottom of the screen.

[0039] The fixed position of the cold clamp pipe tee 1 is determined according to the flow distribution.

[0040] The flow distribution is related to resistance. The addition of a cold clamp pipe tee 1 to the outermost ring pipe will increase local resistance, but the friction resistance along the outermost ring pipe will also decrease after short-circuiting. In order to achieve a specific flow distribution, the resistance of the outermost ring pipe before and after short-circuiting must remain consistent, that is, the pressure drop must be the same.

[0041] ΔP=ΔP+ΔP1-ΔP2

[0042] ΔP is the total resistance of the original outermost tube before transformation;

[0043] ΔP1 is the local resistance increased after adding a cold clamp pipe tee;

[0044] ΔP2 is the friction resistance along the path reduced after the short circuit modification.

[0045]

[0046]

[0047] ξ is the local resistance coefficient;

[0048] λ is the friction resistance coefficient per meter;

[0049] Δl is the reduced length after the outermost circle of tubes is short-circuited.

[0050] Through the above formula, the length Δl that needs to be reduced after the outermost circle tube is short-circuited can be preliminarily calculated, thereby preliminarily determining the short-circuit position of the outermost circle tube, that is, the fixed position of the cold clamp tube.

[0051] At the same time, the flow distribution is related to the heating conditions. After the outermost circle tube is short-circuited, the heat absorption will be reduced, which will cause the flow change. It is necessary to iteratively determine the results of thermal calculation and wall temperature calculation to determine the final short-circuit position of the outermost circle tube, that is, the fixed position of the cold clamp tube.

[0052] Embodiment 2:

[0053] See also Figures 1 to 6A boiler tube row fixing device comprises a cold clamp tube tee 1, the cold clamp tube tee 1 comprises a three-way pipe 11 and two cold clamp tube branches 12, one end of the cold clamp tube branch 12 is fixedly connected to form a connecting portion 13, and an accommodating portion 3 for the tube row 2 to pass through is formed between the two cold clamp tube branches 12, one end of the three-way pipe 11 is fixedly connected to the connecting portion 13 at the connection of the two cold clamp tube branches 12, and the three are mutually connected, the three-way pipe 11 and the accommodating portion 3 are located on the same horizontal line, the tube row 2 passes through the three-way pipe 11 and the accommodating portion 3, so that the cold clamp tube tee 1 fixes each screen tube, solves the problem that the tube screen tube fixing block of the high-temperature reheater and high-temperature superheater tube screen heating surface is unreliable and the tube is easy to be out of the array, thereby improving the safety and reliability of the heating surface of the boiler in a thermal power plant.

[0054] In this embodiment, the cold clamp pipe branches 12 are arranged parallel to each other, so as to better fix the pipe row 2.

[0055] Please continue reading Figure 5 and Figure 6 Specifically, a comb plate 4 matching the pitch and diameter of the tube row 2 is welded on the horizontal section of the cold clamp tube branch 12 to prevent other tubes between the tube panels from deforming out of the row and shaking back and forth.

[0056] Please continue reading Figure 2 and Figure 3 Specifically, further, a slider 5 is provided between the tube rows 2 to fix the tubes on the tube rows 2 together.

[0057] In addition, when selecting the specification of the cold clamp pipe branch 12, the main considerations are qualified strength and the adaptability and matching of the flow rate after the three-way diversion, and sufficient rigidity. The selection of materials mainly considers avoiding welding of dissimilar steels, and the material is kept as consistent as possible with the original outer ring pipe. The pipe diameter is 78%-88% of the diameter before bifurcation.

[0058] The fixing device of the present invention is led out from the boiler heating surface, and is continuously cooled by steam during operation, so there is no burning problem. After the boiler heating surface pipe is added with the cold clamp pipe tee 1, the reliability of the high-temperature area pipe row 2 is greatly improved, the workload of daily inspection and operation maintenance of the "boiler pipe" and the difficulty of four-pipe inspection are significantly reduced, and the long-term operation of the unit is guaranteed.

[0059] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention. Other devices that are the same or similar to the above are all within the protection scope of the present invention.

Claims

1. A method for fixing a boiler tube bank, characterized in that: S1: Cut and short-circuit the outermost tubes at the specified position of the tube panel at a specific position; S2: The cut portion of the outermost circle of pipes is connected to a cold clamp pipe tee (1), the cold clamp pipe tee (1) comprising a three-way pipe (11) and two cold clamp pipe branches (12), one end of the cold clamp pipe branch (12) is fixedly connected to form a connecting portion (13), and a receiving portion (3) for the pipe row (2) to pass through is formed between the two cold clamp pipe branches (12), one end of the three-way pipe (11) is fixedly connected to the connecting portion (13) at the connection point of the two cold clamp pipe branches (12), and the three are interconnected, the three-way pipe (11) and the receiving portion (3) are located on the same horizontal line, and the pipe row (2) passes through the three-way pipe (11); S3: Clamp the heating surface tubes by first opening and then closing the tube panel.

2. A method for fixing a boiler tube bank according to claim 1, characterized in that: The method further comprises S4: welding a comb plate (4) matching the pitch and diameter of the fixed tube row (2) on the horizontal section of the cold clamp tube branch (12).

3. A method for fixing a boiler tube bank according to claim 1 or 2, characterized in that: The designated positions of the tube screen are higher than the inlet section, higher than the outlet section and higher than the bottom of the screen.

4. A method for fixing a boiler tube bank according to claim 1 or 2, characterized in that: The fixed position of the cold clamp pipe tee (1) is determined according to flow distribution.

5. A method for fixing a boiler tube bank according to claim 4, characterized in that: The flow distribution is related to resistance and heating conditions.

6. A method for fixing a boiler tube bank according to claim 5, characterized in that: The resistance of the outermost circle of pipes before and after short-circuiting must remain consistent, and the heating conditions are iteratively determined in combination with thermal calculations and wall temperature calculation results.

7. A method for fixing a boiler tube bank according to claim 1, characterized in that: The cold clamp pipe branches (12) are arranged parallel to each other.

8. A method for fixing a boiler tube bank according to claim 1 or 7, characterized in that: A comb-shaped plate (4) matching the pitch and diameter of the tube row (2) is welded on the horizontal section of the cold clamp tube branch (12).

9. A method for fixing a boiler tube bank according to claim 8, characterized in that: Slide blocks (5) are provided between the tube rows (2).

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