Furnace tube top outlet structure of tubular heating furnace

Abstract

The utility model discloses a tubular heating furnace tube top outlet structure which comprises a frame plate and a furnace tube, the furnace tube is located in the middle of the frame plate, ceramic fiber cotton is filled between the frame plate and the furnace tube, the outer side face of the frame plate is connected with a furnace top plate, and supporting frame plates are symmetrically arranged at the lower end of the frame plate. A lower cover plate is in lap joint with the upper surface of the supporting frame plate, the gap between the end of the lower cover plate and the supporting frame plate is not smaller than 25 mm, a lower semicircular sleeve is arranged on the upper surface of the lower cover plate, a lower connecting plate is arranged on one side of the lower cover plate, and the outer side face of the furnace tube is sleeved with the lower semicircular sleeve. The top outlet structure of the furnace tube of the tubular heating furnace not only can meet the requirement that the end of the furnace tube is allowed to expand, but also can meet the supporting requirement of the last furnace tube.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical industry, in particular to a furnace tube top outlet structure of a tubular heating furnace. Background Art

[0002] In the existing designs of tubular heating furnaces in the field of petroleum refining and petrochemical industry, there are two ways for the last furnace tube of the radiation section to be ejected from the top (top of the radiation section) or from the side (furnace barrel). The furnace tube ejected from the top or from the side and extending out of the furnace is designed to be in the form of a sealed sleeve, and the furnace tube is supported by arranging a heat-resistant cast steel forging bracket inside the furnace.

[0003] like Figure 1 As shown, ceramic fiber blanket is filled between the casing and the furnace tube, the casing is welded to the flange plate, the flange plate is connected to the sealing plate by bolts, the sealing plate and the flange plate have round holes, and are welded 5mm away from the bottom of the casing.

[0004] The sealing filler baffle is used to support the fiber blanket between the casing and the furnace tube. This structure is simple and can meet the sealing and insulation requirements of the furnace tube outlet. However, the last furnace tube usually needs to be connected to the piping. In addition to basic insulation, SH / T3036-2012 requires that the ends of the vertical and horizontal furnace tubes must meet or even exceed the allowable displacement in the standard. For vertical furnace tubes, SH / T3036-2012 requires that the allowable displacement of the furnace tube ends is 25mm (horizontally). From the above structural analysis, the furnace tube can no longer move in the horizontal direction, so the furnace tube structure needs to be improved. Summary of the invention

[0005] The technical problem to be solved by the utility model is to overcome the existing defects and provide a top outlet structure of a tube-type heating furnace tube, which can simultaneously meet the support of the last furnace tube and the expansion displacement requirements required by SH / T3036-2012, and can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a tube-type heating furnace furnace tube top outlet structure, comprising a frame plate and a furnace tube, the furnace tube is located in the middle of the frame plate, ceramic fiber wool is filled between the frame plate and the furnace tube, the outer side of the frame plate is connected to the furnace top plate, the lower end of the frame plate is symmetrically provided with a supporting frame plate, the upper surface of the supporting frame plate is overlapped with a lower cover plate, the end of the lower cover plate is not less than 25mm away from the supporting frame plate, the upper surface of the lower cover plate is provided with a lower semicircular sleeve, one side of the lower cover plate is provided with a lower connecting plate, the lower semicircular sleeve is sleeved on the outer side of the furnace tube, and the two lower semicircular sleeves are connected by a third locking bolt passing through the lower connecting plate;

[0007] An upper cover plate is symmetrically arranged on the upper end of the frame plate, an upper semicircular sleeve is fixed on the lower end of the upper cover plate, the upper semicircular sleeve is sleeved on the outer side surface of the furnace tube, an upper connecting flange is arranged on the upper end of the upper cover plate, the two upper cover plates are connected by a second locking bolt passing through the upper connecting flange, connecting angle steels are symmetrically arranged on the outer side surface of the frame plate, a transverse oblong hole is opened on the upper cover plate, a longitudinal oblong hole is opened on the connecting angle steel, and the connecting angle steel and the upper cover plate are connected by a first locking bolt passing through the oblong hole.

[0008] As a preferred technical solution of the utility model, a 4mm gap is left between the connecting angle steel and the upper cover plate, between the two upper semicircular sleeves, between the two upper cover plates, between the two lower semicircular sleeves and between the two lower cover plates, and the gap is filled with a 5mm ceramic fiber tape.

[0009] As a preferred technical solution of the utility model, the length dimensions of the transverse oblong holes on the upper cover plate and the longitudinal oblong holes on the connecting angle steel are not less than 25 mm.

[0010] As a preferred technical solution of the utility model, vertical ribs are welded on the upper part of the furnace tube, and the vertical ribs are welded to the upper cover plate through a supporting plate.

[0011] As a preferred technical solution of the utility model, a rib plate is welded between the connecting angle steel and the furnace top plate.

[0012] As a preferred technical solution of the utility model, handles are provided on both the upper cover plate and the lower cover plate.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows: (1) by arranging a supporting frame plate under the frame plate, the lower cover plate is overlapped on the supporting frame plate and a space for expansion and movement is left, and oblong holes in different directions are opened between the connecting angle steel and the upper cover plate, so that when the furnace tube moves horizontally, the end displacement requirement of 25 mm of the furnace tube can be met in both the horizontal and vertical directions; (2) the original sleeve is changed to a detachable upper sleeve and a lower sleeve, which is convenient for disassembly and installation, meets the hoisting size of the furnace tube, and can be used as a furnace top inspection hole; (3) by arranging vertical ribs, and connecting the vertical ribs with the upper cover plate through the supporting plate, the furnace tube is supported, and by arranging the rib plate, the support of the furnace top plate is strengthened, and the alloy steel bracket of the last furnace tube can be saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the existing structure;

[0015] Figure 2 It is a schematic diagram of the structure of the utility model;

[0016] Figure 3 for Figure 2 Top view of the .

[0017] In the figure: 1 lower cover plate, 2 support frame plate, 3 frame plate, 4 rib plate, 5 connecting angle steel, 6 upper cover plate, 7 upper semicircular sleeve, 8 upper connecting flange, 9 lower connecting plate, 10 lower semicircular sleeve, 11 first locking bolt, 12 second locking bolt, 13 third locking bolt, 14 handle, 15 support plate, 16 vertical rib, 17 ceramic fiber wool, 18, ceramic fiber belt, 19 furnace top plate. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments (for the convenience of description and understanding, the following is a schematic diagram of the present invention). Figure 1 Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0019] See also Figure 2-3 The utility model provides a technical solution: a tube-type heating furnace furnace tube top outlet structure, comprising a frame plate 3 and a furnace tube, the furnace tube is located in the middle of the frame plate 3, ceramic fiber wool 17 is filled between the frame plate 3 and the furnace tube, and the outer side of the frame plate 3 is connected to the furnace top plate 19;

[0020] The lower end of the frame plate 3 is symmetrically provided with a supporting frame plate 2, and the upper surface of the supporting frame plate 2 is overlapped with a lower cover plate 1. The end of the lower cover plate 1 is 30 mm away from the supporting frame plate 2, which meets the standard requirement of 25 mm allowable displacement, and is convenient for future maintenance. The upper surface of the lower cover plate 1 is provided with a lower semicircular sleeve 10, and a lower connecting plate 9 is provided on one side of the lower cover plate 1. The lower semicircular sleeve 10 is sleeved on the outer side of the furnace tube, and the two lower semicircular sleeves 10 are connected by a third locking bolt 13 passing through the lower connecting plate 9. The third locking bolt 13 is selected from 06Cr19Ni10;

[0021] An upper cover plate 6 is symmetrically arranged at the upper end of the frame plate 3, and an upper semicircular sleeve 7 is fixed at the lower end of the upper cover plate 6. The upper semicircular sleeve 7 is sleeved on the outer side surface of the furnace tube, and an upper connecting flange 8 is arranged at the upper end of the upper cover plate 6. The two upper cover plates 6 are connected by a second locking bolt 12 passing through the upper connecting flange 8. A connecting angle steel 5 is symmetrically arranged on the outer side surface of the frame plate 3. A transverse oblong hole is opened on the upper cover plate 6, and a longitudinal oblong hole is opened on the connecting angle steel 5. The connecting angle steel 5 and the upper cover plate 6 are connected by a first locking bolt 11 passing through the oblong hole. Both the first locking bolt 11 and the second locking bolt are made of carbon steel. The length of the transverse oblong hole on the upper cover plate 6 and the longitudinal oblong hole on the connecting angle steel 5 are not less than 25 mm. If the furnace tube expands in the transverse direction, the furnace tube can move laterally together with the upper connecting flange 8 and the lower cover plate 1.

[0022] In order to ensure the thermal insulation performance of the furnace tube, a 4 mm gap is left between the connecting angle steel 5 and the upper cover plate 6, between the two upper semicircular sleeves 7, between the two upper cover plates 6, between the two lower semicircular sleeves 10 and between the two lower cover plates 1, and the gap is filled with a 5 mm ceramic fiber tape 18.

[0023] In order to improve the supporting stability of the furnace tube, vertical ribs 16 are welded on the upper part of the furnace tube. The vertical ribs 16 are welded to the upper cover plate 6 through the support plate 15. Since the support plate 15 and the vertical ribs 16 are in contact with the furnace tube and are stress-bearing parts, the material is 06Cr19Ni10.

[0024] In order to improve the strength of the furnace roof support, a rib plate 4 is welded between the connecting angle steel 5 and the furnace roof plate 19 .

[0025] In order to facilitate disassembly and installation, handles 14 are provided on the upper cover plate 6 and the lower cover plate 1 .

[0026] When in use: a 5 mm gap is left between the upper semicircular sleeve 7 and the lower semicircular sleeve 10 and the furnace tube, the upper cover plate 6 and the connecting angle steel 5 are connected by the first locking bolt 11, the two upper cover plates 6 are connected by the second locking bolt 12, the lower cover plate 1 is overlapped on the supporting frame plate 2, and the two lower cover plates 1 are connected by the third locking bolt 13.

[0027] The utility model overlaps the lower cover plate 1 on the supporting frame plate 2, reserves a sufficient expansion gap between the supporting frame plate 2 and the frame plate 3, and respectively sets transverse and longitudinal oblong holes on the upper cover plate 6 and the connecting angle steel 5, the oblong holes need to meet the allowable displacement of the furnace tube end, and the vertical ribs 16 are welded on the furnace tube. The last furnace tube is supported by the upper cover plate 6, which saves the last hanger and meets the displacement problem of the furnace tube. At the same time, it can be used as a furnace tube inspection hole, which greatly improves the convenience of use.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tube-type heating furnace furnace tube top outlet structure, comprising a frame plate (3) and a furnace tube, wherein the furnace tube is located in the middle of the frame plate (3), ceramic fiber wool (17) is filled between the frame plate (3) and the furnace tube, and the outer side surface of the frame plate (3) is connected to the furnace top plate (19), characterized in that: A supporting frame plate (2) is symmetrically arranged at the lower end of the frame plate (3); the upper surface of the supporting frame plate (2) is overlapped with a lower cover plate (1); the end of the lower cover plate (1) is spaced at least 25 mm from the supporting frame plate (2); a lower semicircular sleeve (10) is arranged on the upper surface of the lower cover plate (1); a lower connecting plate (9) is arranged on one side of the lower cover plate (1); the lower semicircular sleeve (10) is sleeved on the outer side of the furnace tube, and the two lower semicircular sleeves (10) are connected by a third locking bolt (13) passing through the lower connecting plate (9); An upper cover plate (6) is symmetrically arranged at the upper end of the frame plate (3), an upper semicircular sleeve (7) is fixed at the lower end of the upper cover plate (6), and the upper semicircular sleeve (7) is sleeved on the outer side surface of the furnace tube. An upper connecting flange (8) is arranged at the upper end of the upper cover plate (6), and the two upper cover plates (6) are connected by a second locking bolt (12) passing through the upper connecting flange (8). A connecting angle steel (5) is symmetrically arranged on the outer side surface of the frame plate (3), a transverse oblong hole is opened on the upper cover plate (6), and a longitudinal oblong hole is opened on the connecting angle steel (5), and the connecting angle steel (5) and the upper cover plate (6) are connected by a first locking bolt (11) passing through the oblong hole.

2. The outlet structure at the top of a tube-type heating furnace according to claim 1, characterized in that: A 4 mm gap is left between the connecting angle steel (5) and the upper cover plate (6), between the two upper semicircular sleeves (7), between the two upper cover plates (6), between the two lower semicircular sleeves (10), and between the two lower cover plates (1), and the gap is filled with a 5 mm ceramic fiber tape (18).

3. The outlet structure at the top of a tube-type heating furnace according to claim 1, characterized in that: The length dimensions of the transverse oblong holes on the upper cover plate (6) and the longitudinal oblong holes on the connecting angle steel (5) are both not less than 25 mm.

4. The outlet structure at the top of a tube-type heating furnace according to claim 1, characterized in that: A vertical rib (16) is welded to the upper part of the furnace tube, and the vertical rib (16) is welded to the upper cover plate (6) through a supporting plate (15).

5. The outlet structure at the top of a tube-type heating furnace according to claim 1, characterized in that: A rib plate (4) is welded between the connecting angle steel (5) and the furnace top plate (19).

6. The outlet structure at the top of a tube-type heating furnace according to claim 1, characterized in that: The upper cover plate (6) and the lower cover plate (1) are both provided with handles (14).

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