Center furnace tube hanging bracket structure

Abstract

The utility model discloses a central furnace tube hanging bracket structure which comprises U-shaped hanging brackets, an annular combination beam, a hinge frame and an H-shaped steel beam, a plurality of U-shaped hanging brackets are evenly distributed at the lower end of the annular combination beam, the annular combination beam is hinged to the U-shaped hanging brackets, and the H-shaped steel beam is arranged above the annular combination beam. According to the central furnace tube hanging bracket structure, hoisting of a central circular tube row of a cylindrical furnace can be achieved, meanwhile, the requirement for furnace tube expansion is met, and the situation of stress concentration is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical engineering, and particularly relates to a central furnace tube hanger structure. Background Technique

[0002] The furnace types of tubular heating furnaces in refineries are divided into two categories: cylindrical furnaces and box furnaces. Most of the furnace types are cylindrical heating furnaces. The radiant furnace tubes of cylindrical heating furnaces generally adopt a sidewall upper support structure and are arranged along the circumference on the inner wall of the furnace wall lining. Limited by the furnace type structure, the conventional capacity expansion transformation of cylindrical furnaces is relatively cumbersome, and usually, the furnace tubes are heightened. Affected by heat transfer, the maximum ratio of the furnace chamber height to the pitch circle diameter is not more than 2.75, and the height increase of the furnace tubes is limited. Therefore, the heating furnace load increase is limited, and the capacity expansion treatment volume is limited.

[0003] In addition to the method of heightening the furnace tubes for the capacity expansion transformation of cylindrical furnaces, the method of setting a central ring tube row in the middle of the furnace chamber to increase the heat exchange area of the furnace tubes can also increase the heating furnace load. The arrangement form of the tube row is shown in Figure 1 , a central ring row of tubes 1 is arranged in the middle of the radiant furnace chamber, an outer ring row of tubes 2 is arranged near the radiant furnace wall 4, burners 3 are evenly arranged between the central ring row of tubes 1 and the outer ring furnace tubes 2, and each tube pass is symmetrically arranged to achieve hydraulic and thermodynamic symmetry. The central ring row of tubes 1 is conventionally fixed to the furnace tubes in a furnace base installation form. Since there is a convective flue gas inlet in the middle of the furnace top, there is no fixed position for the furnace tube hanger, and the furnace top hoisting form is generally difficult to achieve. The flue gas temperature in the radiant furnace chamber of the heating furnace is 700 - 800 °C, which belongs to a high-temperature stress environment. When the central ring row of tubes 1 is circularly arranged in the middle of the furnace chamber and the furnace base installation form is adopted, due to the inconsistent expansion directions of the central ring row of tubes 1 and the outer ring row of tubes 2, the central ring row of tubes 1 expands upward, and the outer ring row of tubes 2 expands downward. The connecting horizontal furnace tubes between the two tube rows will have a problem of excessive stress, and there are certain safety hazards. When the central ring row of tubes 1 adopts a hoisting structure at the top of the radiant furnace chamber, the problem of inconsistent expansion can be avoided. The central ring row of tubes 1 and the outer ring row of tubes 2 expand downward uniformly, eliminating the stress generated by the expansion of the furnace tubes. At the same time, for the high-temperature stress environment in the furnace, expansion in all directions needs to be considered. Therefore, a hanger structure that can solve the hoisting problem of the central ring row of tubes 1 is required. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the existing design drawbacks, provide a central furnace tube hanger structure, which can realize the hoisting of the central circular tube row of the cylindrical furnace, meet the expansion needs of the furnace tubes at the same time, avoid stress concentration, and can effectively solve the problems in the background technique.

[0005] To achieve the above object, the present utility model provides the following technical solutions: A central furnace tube hanger structure, comprising a U-shaped hanger, an annular combined beam, a hinge bracket and an H-shaped steel beam. A plurality of U-shaped hangers are evenly distributed at the lower end of the annular combined beam, and the annular combined beam and the U-shaped hanger are hinged. The H-shaped steel beam is arranged above the annular combined beam. The hinge bracket is arranged between the H-shaped steel beam and the annular combined beam, and both ends of the hinge bracket are respectively hinged to the H-shaped steel beam and the annular combined beam.

[0006] As a preferred technical solution of the present utility model, the number of the H-shaped steel beams is two, and the two H-shaped steel beams are symmetrically arranged above the annular combined beam.

[0007] As a preferred technical solution of the present utility model, the H-shaped steel beam and the annular combined beam are hinged through two hinge brackets.

[0008] As a preferred technical solution of the present utility model, the upper end of the hinge bracket and the H-shaped steel beam are longitudinally hinged, the lower end of the hinge bracket and the annular combined beam are transversely hinged, and the connection parts of the hinge bracket with the H-shaped steel beam and the annular combined beam are respectively hinged through pin shafts I.

[0009] As a preferred technical solution of the present utility model, the annular combined beam and the U-shaped hanger are hinged through a pin shaft II.

[0010] As a preferred technical solution of the present utility model, the annular combined beam is composed of a plurality of arc-shaped beams, and the arc-shaped beams are connected through pin nails.

[0011] As a preferred technical solution of the present utility model, the U-shaped hanger, the annular combined beam and the H-shaped steel beam are all made of alloy heat-resistant steel casting materials.

[0012] Compared with the prior art, the beneficial effect of the present utility model is that: the central furnace tube hanger structure of the present utility model is hinged and connected through the U-shaped hanger, the annular combined beam and the H-shaped steel beam, and an expansion gap is left at the connection part, which meets the expansion displacement in all directions, avoids the problem of stress concentration, and can effectively solve the hoisting and expansion problems of the central circular furnace tube row. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the prior hanger structure;

[0014] Figure 2 It is a schematic diagram of the structure of the present utility model;

[0015] Figure 3 It is a schematic diagram of the structure of the present utility model when hoisting the furnace tube.

[0016] In the figure: 1 central ring tube row, 2 outer ring tube row, 3 burner, 4 radiant furnace wall, 5 U-shaped hanger, 6 annular combined beam, 7 articulated frame, 8 H-shaped steel beam, 9 pin I, 10 pin II, 11 convection section steel structure, 12 support, 13 furnace tube. Detailed implementation manner

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments (for the convenience of description and understanding, the following describes with the upper side of Figure 2 being the upper side). Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 2-3 , the present invention provides a technical solution: a central furnace tube hanger structure, including a U-shaped hanger 5, an annular combined beam 6, an articulated frame 7 and an H-shaped steel beam 8;

[0019] The H-shaped steel beam 8 is arranged above the annular combined beam 6, and the H-shaped steel beam 8 is supported on the convection section steel structure and is not restricted by the radiant top steel structure;

[0020] A plurality of U-shaped hangers 5 are evenly distributed at the lower end of the annular combined beam 6, and the annular combined beam 6 is hinged to the U-shaped hanger 5 through a pin II 10, which can absorb the circumferential expansion of the furnace tube 13;

[0021] The annular combined beam 6 is composed of a plurality of arc-shaped beams, which is convenient for casting. A large-gap connection structure is adopted between the arc-shaped beams, and at the same time, pin-limiting is adopted to meet the expansion requirements of the annular beam;

[0022] The articulated frame 7 is arranged between the H-shaped steel beam 8 and the annular combined beam 6. The upper end of the articulated frame 7 is longitudinally hinged to the H-shaped steel beam 8, and the lower end of the articulated frame 7 is horizontally hinged to the annular combined beam 6, which can simultaneously meet the horizontal and longitudinal expansion displacements. The connection parts of the articulated frame 7 with the H-shaped steel beam 8 and the annular combined beam 6 are both hinged through a pin I 9.

[0023] Furthermore, in order to improve the overall hoisting strength of the hanger, the number of H-shaped steel beams 8 is two, and the two H-shaped steel beams 8 are symmetrically arranged above the annular combined beam 6. The H-shaped steel beam 8 is hinged to the annular combined beam 6 through two articulated frames 7.

[0024] Furthermore, the U-shaped hanger 5, the annular combined beam 6 and the H-shaped steel beam 8 are all made of alloy heat-resistant steel casting materials. According to the stress level, the material can be selected from ZG40Cr25Ni20 or ZG45Ni35Cr25Nb.

[0025] The support 12 is fixed to the convection section steel structure 11, and two H-shaped steel beams 8 are supported on the support 12 respectively. The H-shaped steel beam 8 and the support 12 are sliding supports, and an expansion gap is left between each other to meet the expansion and displacement in the horizontal direction. The U-shaped hanger 5 hangs the furnace tube 13, and the articulated frame 7 is provided with a pin shaft I 9 in the Y-axis and X-axis directions. The expansion displacement in the Y-axis and X-axis directions can be met by swinging. The U-shaped hanger 5 and the annular combined beam 6 adopt a pin shaft II 10 set along the circumferential direction of the furnace tube, and an expansion gap is left between each other, which can meet the expansion displacement of the furnace tubes 13.

[0026] The utility model is suitable for high-temperature stress environments with furnace flue gas temperatures of 700-800°C, meets the needs of hoisting the center ring pipe row, and is hinged to the H-shaped steel beam 8 and the annular combined beam 6 in the Y-axis and X-axis directions through the hinged frame 7, which can simultaneously meet the horizontal lateral and longitudinal expansion displacements; the U-shaped hanger 5 and the annular combined beam 6 are hinged with a pin II10, which can absorb the expansion of the furnace tube in the circumferential direction and avoid damage caused by stress concentration.

[0027] 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 central furnace tube hanger structure, characterized in that: The invention comprises a U-shaped hanger (5), an annular composite beam (6), an articulated frame (7) and an H-shaped steel beam (8); a plurality of U-shaped hangers (5) are evenly distributed at the lower end of the annular composite beam (6); the annular composite beam (6) and the U-shaped hanger (5) are articulated; the H-shaped steel beam (8) is arranged above the annular composite beam (6); the articulated frame (7) is arranged between the H-shaped steel beam (8) and the annular composite beam (6); and the two ends of the articulated frame (7) are respectively articulated to the H-shaped steel beam (8) and the annular composite beam (6).

2. A central furnace tube hanger structure according to claim 1, characterized in that: The number of the H-shaped steel beams (8) is two, and the two H-shaped steel beams (8) are symmetrically arranged above the annular composite beam (6).

3. A central furnace tube hanger structure according to claim 1 or 2, characterized in that: The H-shaped steel beam (8) and the annular composite beam (6) are hingedly connected via two hinged frames (7).

4. The central furnace tube hanger structure according to claim 1, characterized in that: The upper end of the articulated frame (7) is longitudinally hinged to the H-shaped steel beam (8), and the lower end of the articulated frame (7) is transversely hinged to the annular composite beam (6). The connection between the articulated frame (7) and the H-shaped steel beam (8) and the annular composite beam (6) is hinged through a pin shaft I (9).

5. The central furnace tube hanger structure according to claim 1, characterized in that: The annular composite beam (6) and the U-shaped hanger (5) are hingedly connected via a pin II (10).

6. The central furnace tube hanger structure according to claim 1, characterized in that: The annular composite beam (6) is composed of a plurality of arc-shaped beams, and the arc-shaped beams are connected by pins.

7. The central furnace tube hanger structure according to claim 1, characterized in that: The U-shaped hanger (5), the annular composite beam (6) and the H-shaped steel beam (8) are all made of alloy heat-resistant steel casting material.

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