Torsion-resistant upper supporting tube plate

Abstract

The utility model discloses an anti-torsion upper supporting tube plate which comprises a web plate, two supporting lugs, two vertical frame plates, two transverse rib plates, two vertical rib plates and two guide plates, the number of the transverse rib plates is equal to the number of tube rows supported by the tube plate or the number of the tube rows plus one, the supporting lugs are arranged at the tops of the two sides of the tube plate, and the vertical rib plates are arranged at the tops of the two sides of the tube plate. The guide plates are arranged at the bottoms of the left side and the right side of the tube plate and located on the same plane with the supporting lugs, the two sets of vertical rib plates are located between every two adjacent transverse rib plates, perpendicularly intersect with the transverse rib plates and are parallel to the vertical frame plate, and the number of the vertical rib plates in each set is equal to the tube row number. The two groups of vertical rib plates are respectively positioned at the central positions of two adjacent holes in the outermost edges of the two sides of the tube plate and are as high as the transverse rib plates. According to the utility model, the stress state of the tube plate can be optimized, the overall and local stress values are reduced, the allowable stress is high, the out-of-plane torsion is resisted, the material consumption is saved, the cost is reduced, and the stability of the tube plate is improved.

Description

Technical Field

[0001] The utility model relates to the field of tube sheet support structures for industrial furnace coil pipes in the petrochemical and power industries, especially the tube sheet support structure for convective coils of tubular heating furnaces. Background Art

[0002] Coil pipes are commonly used in industrial furnaces in fields such as petrochemical, thermal power, and nuclear power. The coil pipe support structure is mostly a tube sheet support structure. Both the tube sheet and the coil pipe are in high-temperature flue gas, so the material used for the tube sheet must be high-alloy steel, such as ZG25Cr12Ni and ZG25Cr20Ni. Since traditional design methods mostly target the lower-supported tube sheet structure, the relatively large height of the tube sheet structure leads to relatively large calculated stresses in the lower-supported tube sheet, which in turn increases the width and thickness of the tube sheet. Due to the high cost of high-alloy steel, the traditional tube sheet structure uses more materials, resulting in an increase in the input cost. For example, the tube sheet structure in patent CN107796258 adopts a top suspension method, and its force characteristics are simple, but the lack of effective restraint of the tube sheet will cause vibration problems, and the lack of out-of-plane support in the tube sheet structure itself is likely to cause strength problems; in addition, this structure is only applicable to the top suspension occasion, and the weights of all tube sheet coil pipes and the tube sheet will be concentrated on the topmost tube sheet, and the design is unreasonable. The tube sheet structure in an embodiment of the double vertical rib tube sheet disclosed in patent CN 203454779U shows that its support position is at the upper parts on both sides of the tube sheet. When there is friction between the tube sheet and the tubes, out-of-plane torsion will occur. On the one hand, it may cause local stress overrun of the tube sheet, and on the other hand, the support effect is weakened after the tube sheet is twisted. With the large-scale development of industrial furnaces, the number of coil pipes increases, and the span of the support tube sheet increases, which all pose new requirements for the tube sheet structure and design, and the requirements for its reliability and economy also increase accordingly.

[0003] Therefore, aiming at the shortcomings and defects of the current tube sheet support design structure, it is necessary to carry out refined design from the perspective of structural mechanics according to parameters such as the actual span and height of the tube sheet, make full use of the force characteristics of the tube sheet, and propose a more optimized tube sheet structure form. On the one hand, the cost can be reduced, and on the other hand, the reliability requirements of large-scale devices can be met. Summary of the Utility Model

[0004] Aiming at the defects of the existing tube sheet support structure, the utility model provides a torsion-resistant upper-supported tube sheet, which optimizes the stress state of the tube sheet, reduces its stress value, and then reduces the material consumption of the tube sheet to reduce costs and improve the reliability of the tube sheet by changing the traditional tube sheet support position and restricting out-of-plane torsion.

[0005] The utility model achieves the above object through the following technical means.

[0006] The utility model provides a torsion-resistant upper support tube sheet, which comprises a web plate, supporting lugs, vertical frame plates and transverse rib plates, and is characterized in that: the torsion-resistant upper support tube sheet further comprises vertical rib plates and guide plates; there is one web plate, two vertical frame plates, two supporting lugs and two guide plates; the lower surface of the supporting lug is the contact position for supporting both sides of the tube sheet; the number of transverse rib plates is equal to the number of tube rows supported by the tube sheet or the number of tube rows plus one; the supporting lugs are arranged at the upper parts of both sides of the tube sheet; the guide plates are arranged at the bottoms of the left and right sides of the tube sheet and are in the same plane as the supporting lugs; there are two groups of vertical rib plates, both of which are located between two adjacent transverse rib plates, are vertically and intersectingly arranged with the transverse rib plates, and are parallel to the vertical frame plates; the number of vertical rib plates in each group is equal to the number of tube rows; the two groups of vertical rib plates are respectively located at the central positions of the two holes adjacent to the outermost sides of both sides of the tube sheet, and the height is equal to that of the transverse rib plates.

[0007] Preferably, the height of the supporting lug is less than the height of the tube sheet, and preferably the height of the supporting lug is between 1 / 3 and 1 / 2 of the height of the tube sheet. The upper support is realized through simply supported constraints, and the contact position is the lower surfaces of the supporting lugs on all sides of the tube sheet.

[0008] Preferably, the upper surface of the supporting lug is flush with the upper edge of the top transverse rib plate, but is not limited to being flush. The lower surface of the supporting lug can be aligned with a certain layer of transverse rib plate. Preferably, the lower surface of the supporting lug is aligned with the lower edge of the second or third layer of transverse rib plate, but is not limited to being aligned.

[0009] Preferably, the torsion resistance of the guide plate is realized by restricting the out-of-plane displacement of the guide plate, and the guiding and restricting contact position of the guide plate is the front and rear surfaces of the guide plate.

[0010] Preferably, the guide plate is aligned with the web plate in the same plane, and the lower surface of the guide plate is flush with the lower edge of the bottom transverse rib plate, but is not limited to being aligned.

[0011] Preferably, the upper part of the guide plate is an inclined side and intersects with the vertical frame plate.

[0012] The advantages of the present utility model compared with the prior art are as follows: The anti-torsion upper support tube sheet of the present utility model fully considers the influence of the span and height parameters of the tube sheet, as well as factors such as the stress state of the tube sheet. It changes the traditional bottom support structure of the tube sheet to an upper support (ear), and a guide plate is used at the lower part of the tube sheet to limit it out of plane. By selecting appropriate ratios of the ear and the tube sheet height and the positional relationship between the ear and the tube sheet, first, the bending moment value received by the tube sheet can be reduced, and its normal stress is also reduced accordingly, thereby achieving the purpose of reducing the material consumption of the tube sheet; second, preferably making the upper surface of the ear flush with the upper edge of the top transverse rib plate can make the force transmission path of the tube sheet structure more reasonable, and can reduce the stress received by the remaining rib plates and vertical frame plates to a certain extent; third, through the upper support form, the high stress point of the tube sheet can be moved to a lower temperature position, improving the allowable stress of the material, and further reducing the material consumption; fourth, through the out-of-plane limit at the lower part of the tube sheet, the torsion of the tube sheet under the horizontal force can be prevented, improving the reliability of the support. Fifth, by arranging vertical rib plates on both sides of the tube sheet, the anti-torsion performance of the tube sheet can be further enhanced, and at the same time, the shear resistance of the tube sheet can be improved.

[0013] The following further elaborates on the present utility model in detail with reference to the drawings and specific embodiments, but the drawings and specific embodiments do not limit the scope of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the anti-torsion upper support tube sheet structure of the present utility model;

[0015] Figure 2 is Figure 1 A-A sectional view of;

[0016] Figure 3 Installation diagram of the anti-torsion upper support tube sheet of the present utility model;

[0017] The reference numerals shown in the figures are: 1 - ear, 2 - vertical frame plate, 3 - first layer of transverse rib plate, 4 - second layer of transverse rib plate, 5 - third layer of transverse rib plate, 6 - fourth layer of transverse rib plate, 7 - fifth layer of transverse rib plate, 8 - sixth layer of transverse rib plate, 9 - guide plate, 10 - web, 11 - vertical rib plate, 41 - support bracket, 42 - guide frame. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Such as Figure 1 and Figure 2As shown in the figure, a torsion-resistant upper support tube sheet of the present utility model includes two lugs 1, two vertical frame plates 2, six layers of transverse rib plates 3 - 8, two guide plates 9, one web plate 10, and two groups of vertical rib plates 11, with a total of ten. Among them, there are two lugs 1, two vertical frame plates 2, two guide plates 9, one web plate 10, six layers of transverse rib plates, namely the first layer of transverse rib plate 3, the second layer of transverse rib plate 4, the third layer of transverse rib plate 5, the fourth layer of transverse rib plate 6, the fifth layer of transverse rib plate 7, and the sixth layer of transverse rib plate 8. There are two groups of vertical rib plates 11, with a total of ten.

[0019] The lugs 1 are located at the upper parts on both sides of the tube sheet. The ratio of the height of the lugs 1 to the height of the tube sheet is preferably 2:5. The upper surface of the lugs is flush with the upper edge of the first layer of transverse rib plate 3 on the tube sheet, and the lower surface of the lugs is aligned with the lower edge of the third layer of transverse rib plate 5.

[0020] The guide plates 9 are located at the lower parts on both sides of the tube sheet. The guide plates 9 and the web plate 10 are in the same plane. The lower surface of the guide plates 9 is flush with the lower edge of the sixth layer of transverse rib plate 8. The upper part of the guide plates 9 is a bevel (inclined surface) that intersects with the vertical frame plates 2.

[0021] There are two groups of vertical rib plates 11 (5 in each group), which are arranged on both sides of the tube sheet. Each vertical rib plate is located between two adjacent transverse rib plates, intersects perpendicularly with the transverse rib plates, and is parallel to the vertical frame plates. And the vertical rib plates are located at the central positions of the two outermost adjacent holes on both sides of the tube sheet, and the height is equal to the height of the transverse rib plate of this layer.

[0022] As Figure 3 As shown in the figure, an installation diagram of a torsion-resistant upper support tube sheet of the present utility model. The lugs 1 are located at the upper parts on both sides of the tube sheet. The support brackets 41 are fixed on the columns on both sides. The lower surfaces of the lugs on both sides of the tube sheet support on the upper surfaces of the support brackets 41. The guide plates 9 are located at the lower parts on both sides of the tube sheet. The guide frames 42 are fixed on the columns on both sides. The guide plates 9 are located in the middle of the guide frames, which can limit the out-of-plane displacement of the tube sheet, thereby preventing the tube sheet from undergoing out-of-plane torsion.

[0023] To verify the effect of a torsion-resistant upper support tube sheet of the present utility model, stress calculations were respectively carried out on the traditional tube sheet structure and the torsion-resistant upper support tube sheet of the present utility model using general finite element software. The external dimensions and thickness dimensions of the two model structures are the same. The difference is that the traditional tube sheet structure uses a simply supported support at the bottom, while the present utility model uses a torsion-resistant upper support tube sheet. The calculation results show that the maximum normal stress of the traditional tube sheet is 6.3 MPa, and the maximum normal stress of the torsion-resistant upper support tube sheet is 5 MPa, with the stress value reduced by about 20%. On the other hand, the temperature at the maximum stress point of the traditional tube sheet is 830 °C, and the allowable stress of the corresponding material is 22.1 MPa. While the temperature at the maximum stress point of the torsion-resistant upper support tube sheet is 745 °C, and the allowable stress of the material is 35.8 MPa, with the allowable stress of the material increased by 62%.

[0024] The above description is of the embodiments of the present utility model, and thus is exemplary and not exhaustive. It should not be construed as a limitation on the patent scope of the present utility model. Without departing from the scope and spirit of the described embodiments, several variations and improvements can be made by those of ordinary skill in the art, and these all fall within the protection scope of the present utility model.

Claims

1. A torsion-resistant upper support tube plate, comprising a web, lugs, vertical frame plates and transverse rib plates, characterized in that: The torsion-resistant upper support tube sheet further includes vertical stiffeners and guide plates. There is one web plate, two vertical frame plates, two lugs and two guide plates. The lower surface of the lug is the support contact position on both sides of the tube sheet. The number of transverse stiffeners is equal to the number of tube rows supported by the tube sheet or the number of tube rows plus one. The lugs are arranged on the upper parts of both sides of the tube sheet. The guide plates are arranged at the bottoms of the left and right sides of the tube sheet and are in the same plane as the lugs. There are two groups of vertical stiffeners, both of which are located between two adjacent transverse stiffeners, are vertically intersected with the transverse stiffeners and are parallel to the vertical frame plates. The number of vertical stiffeners in each group is equal to the number of tube rows. The two groups of vertical stiffeners are respectively located at the central positions of the two adjacent holes at the outermost edges on both sides of the tube sheet, and the height is equal to that of the transverse stiffeners.

2. The anti-torsion upper support tube sheet according to claim 1, characterized in that: The height of the lug is less than the height of the tube sheet.

3. The torsion-resistant upper support tube sheet according to claim 1, characterized in that: The guide constraint contact position of the guide plate is the front and rear surfaces of the guide plate.

4. The torsion-resistant upper support tube sheet according to claim 2, wherein: The height of the lug is between 1 / 3 and 1 / 2 of the height of the tube sheet.

5. The anti-torsion upper support tube sheet according to claim 4, wherein: The upper surface of the lug is flush with the upper edge of the top transverse stiffener, but not limited to being flush.

6. The anti-torsion upper support tube sheet according to claim 4, characterized in that: The lower surface of the lug is aligned with the lower edge of the second or third layer of transverse stiffeners, but not limited to being aligned.

7. The anti-torsion upper support tube sheet according to claim 1, wherein: The guide plates are arranged at the bottoms of the left and right sides of the tube sheet and are in the same plane as the lugs. The lower surface of the guide plate is flush with the lower edge of the bottom transverse stiffener.

8. The anti-torsion upper support tube sheet according to claim 1, characterized in that: The upper part of the guide plate is an inclined edge and intersects with the vertical frame plate.

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