A stepped tube plate and an industrial furnace having the same

Abstract

The present application relates to the technical field of petrochemical industry furnace, in particular to a step-shaped tube plate and an industrial furnace with the same, the industrial furnace comprises a furnace wall, an end tube plate, a lug, an intermediate tube plate and a coil pipe, the intermediate tube plate is a step-shaped tube plate, comprising a vertical plate, a frame plate and a supporting leg, the vertical plate is provided with a plurality of supporting holes for the furnace pipe to pass through, the frame plate surrounds the circumferential side of the vertical plate, and the circumferential side of the vertical plate is provided with a step structure, compared with the prior art, the step structure makes the structural material concentrate on the key stress position on the tube plate, for example, the long intermediate, which is more consistent with the simply supported beam stress characteristics of the tube plate; as a notch, the step structure is beneficial to the transverse flow of high-temperature flue gas in the furnace chamber operation, prolongs the flue gas path and fully exchanges heat; as a channel for personnel and tool accessories in the furnace chamber maintenance, it is beneficial to expand the operation space and improve the efficiency; and lightweight design can also be realized, the material and construction costs are reduced, and the adaptability of the structure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petrochemical industry furnace, in particular to the equipment for heat exchange of fluid medium in oil refining, petrochemical industry, coal chemical industry and other chemical process, and more particularly to a stepped tube plate and an industrial furnace with the same. BACKGROUND

[0002] (1) Structure design and function of traditional heating furnace

[0003] The heating furnace is the heart of oil refining and petrochemical device, and the function of the tubular heating furnace is to heat the medium (oil or gas) in the tube to the required temperature of the process.

[0004] The four sides of the furnace body are surrounded by high furnace walls, and the furnace walls are made of steel plates welded on the steel frame of I-beam and other shaped steel, and heat preservation nails are welded on the steel plates, and heat insulation and wear-resistant materials are cast between the heat preservation nails. The feet installed on the two side walls support the tube plate, and the furnace tube passes through the perforated tube plate supported by the tube plate, and the oil flowing through the furnace tube needs to be heated, and the high-temperature flue gas or hot air flowing outside the furnace tube in the furnace chamber vertically from bottom to top (or horizontally from left to right, from right to left) is the high-temperature flue gas or hot air, and the heat is transferred to the oil in the tube through the tube wall.

[0005] Generally speaking, in order to fully balance and utilize various heat sources, a heating furnace usually consists of a radiation section at the bottom, a convection section above, a chimney at the top and peripheral auxiliary facilities, and the convection section is composed of multiple groups of modules with the same structure stacked up and down. In order to save the space inside the heating furnace and reduce the overall height of the heating furnace, the convection section module usually has a cuboid structure. The distance between the tube plate support ears on the two side walls is the span of the tube plate, and the tube plate is supported on the support ears of the two side walls, and the support holes on the tube plate support the furnace tube.

[0006] (2) Tube plate of traditional heating furnace and its problems

[0007] With the long-term development of social economy, on the one hand, the quality of the crude oil is getting worse and worse, the oil refining and chemical process technology develops towards high temperature and high pressure deep processing, and the temperature experienced by the tube plate of the industrial furnace from heating function to reaction function is getting higher and higher. On the other hand, the demand for energy is increasing, and the industrial furnace is developing towards large scale, and the large scale production capacity requires the industrial furnace to be larger and larger, and the large width tube plate is needed to support the furnace tube. The stress characteristics of the whole large width tube plate in the width direction is that the upper part is subjected to compressive stress and the lower part is subjected to tensile stress. According to the traditional structure design of the tube plate, it is difficult to meet the requirements of economic construction. In 2015, the paper "Large heating furnace high level development promotes the progress of modular manufacturing technology [J]. Petroleum and Chemical Equipment Technology, 2015, 36(1): 28-33." Reports that domestic cast tube plate has achieved a width of 4.6m, a height of 2.0m, and a height of 0.25m on both sides of the reinforcing rib. On the one hand, the large tube plate has a large span in structure, and the wall thickness needs to be increased to meet the requirements when the strength is designed as a simply supported beam. The traditional large tube plate is heavy, which in turn requires stronger furnace wall columns to support it. On the other hand, the main body of the traditional structure tube plate is rectangular, which hinders the natural flow of flue gas in the horizontal direction when installed in the furnace. In addition, the industrial furnace tube plate cannot realize the deflection of the flue gas path like the support plate of the tube heat exchanger. In short, the traditional tube plate makes the construction cost of the industrial furnace not economical, and optimization is necessary.

[0008] Therefore, improving the existing tube plate structure, improving its stress mode and cost conditions can improve the economic benefit of the industrial furnace, which has strong practical significance. SUMMARY

[0009] In view of the above technical problems existing in the prior art, the present application provides a stepped tube plate and an industrial furnace with the same.

[0010] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0011] A stepped tube plate is provided, which comprises a vertical plate, a frame plate and a foot. The vertical plate is provided with a plurality of support holes for the furnace tube to pass through, and the side wall of the vertical plate is provided with a reinforcing rib. The reinforcing rib is staggered with the support hole. The frame plate surrounds the circumferential side of the vertical plate, and the foot is fixed to the outer side of the frame plate. The characteristic is that the circumferential side of the vertical plate is provided with a stepped structure.

[0012] As a further preferred scheme, the foot is located at the bottom of the frame plate, the stepped structure is a middle lifting step lifting from both ends of the vertical plate to the middle, or the stepped structure is an outward lifting step lifting from the middle of the vertical plate to both ends. The middle lifting step and the outward lifting step are respectively arranged symmetrically or asymmetrically with respect to the center line of the vertical plate.

[0013] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0014] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0015] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0016] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0017] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0018] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0019] As a further preferred scheme, the step structure is an asymmetric step descending or ascending from one end of the vertical plate to the other end.

[0020] Industrial furnace, comprising furnace wall, end tube plate, lug, intermediate tube plate and coil pipe, the end tube plate is fixed at both ends of the furnace wall to jointly enclose the hearth, the lug is fixed on the inner side of the furnace wall, the intermediate tube plate is distributed along the inner side of the furnace wall, the coil pipe comprises a plurality of furnace pipes and a plurality of bends, the furnace pipe passes through the supporting hole of the intermediate tube plate and the end tube plate, and the bend connects the plurality of furnace pipes, characterized in that: the intermediate tube plate is the step-shaped tube plate.

[0021] The beneficial effects of the present application are as follows:

[0022] The present application discloses a step-shaped tube plate and an industrial furnace with the same. The vertical plate as the main body of the tube plate has a three-dimensional step structure. Compared with the traditional rectangular tube plate, the tube plate with the step structure has a more reasonable structure: (1) the step structure concentrates the structural material on the key stress position on the tube plate, such as the middle of the span, which is more consistent with the simply supported beam stress characteristics of the tube plate; (2) the step structure as a notch is beneficial to the transverse flow of high-temperature flue gas during the operation of the hearth, prolongs the flue gas path, and fully exchanges heat; (3) the step structure as a channel for personnel and tool accessories during the hearth maintenance is beneficial to expanding the operation space and improving the efficiency; (4) the step structure can also realize lightweight design, reduce material and construction cost, and improve the adaptability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of a group of modules of the industrial furnace in the embodiment.

[0024] Figure 2 This is a schematic diagram of the tube sheet structure under conventional thinking, which is generally a rectangular structure.

[0025] Figure 3 This is a first structural form of a stepped tube plate in the embodiment, showing that a planar step structure is provided at each top of the two ends of the vertical web plate.

[0026] Figure 4 This is a second structural form of a stepped tube plate in the embodiment, showing that an inclined step structure is provided at each top of the two ends of the vertical web plate.

[0027] Figure 5 This is a third structural form of a stepped tube plate in the embodiment, showing that a curved step structure is provided at the top of each end of the vertical web plate.

[0028] Figure 6 This is a fourth structural form of a stepped tube plate in the embodiment, showing that a transverse step formed by narrowing the width is provided between the top surface and the end surface of the vertical plate, and the transverse steps at both ends are symmetrical.

[0029] Figure 7 This is a fifth structural form of a stepped tube sheet in the embodiment, showing that there are transverse steps formed by narrowing the width between the top surface and the end surface, and the transverse steps at both ends are symmetrical; there are also longitudinal steps formed by narrowing the thickness, and the longitudinal steps on both sides are symmetrical.

[0030] Figure 8 This is a sixth structural form of a stepped tube sheet in the embodiment, showing that there are transverse steps formed by height changes between the top surface and the two end surfaces, and the transverse steps at both ends are symmetrical; there are also lateral steps formed by thinning thickness at both ends, and the lateral steps at both ends are symmetrical. DETAILED DESCRIPTION

[0031] The present invention is described in detail below with reference to specific embodiments and accompanying drawings.

[0032] The industrial furnace of this embodiment, such as Figure 1As shown, it includes a furnace wall 1, end tube sheets 3, lugs, an intermediate tube sheet 5 and a coil 2. The end tube sheets 3 are fixed to both ends of the furnace wall 1 to form a furnace together. The lugs are fixed to the top of the furnace wall 1. The intermediate tube sheet 5 is distributed along the inside of the furnace wall. The coil 2 includes multiple furnace tubes 4 and multiple elbows 21. The furnace tubes 4 pass through the support holes of the intermediate tube sheet 5 and the end tube sheet 3. The elbows 21 connect the multiple furnace tubes 4. Figure 2 As shown, it is generally a rectangular structure, and the main improvements of this embodiment are: Figure 3 As shown, the intermediate tube sheet 5 is a stepped tube sheet, and its structure includes a vertical plate 6, a frame plate 7 and a support leg 8. The vertical plate 6 is provided with a plurality of support holes 9 for the furnace tubes to pass through. The side walls of the vertical plate 6 are provided with reinforcing ribs 10, and the reinforcing ribs 10 and the support holes 9 are staggered with each other. The frame plate 7 surrounds the circumference of the vertical plate 6, and the support leg 8 is fixed to the outer side of the frame plate 7. The circumference of the vertical plate 6 is provided with a step structure 11.

[0033] As one example, Figure 3 or Figure 4 or Figure 5 As shown, the support leg 11 is located at the bottom of the frame plate 7, and the step structure 11 is located at the top of the vertical frame plate 6. The step structure 11 is a center-lifting step that rises from both ends of the vertical frame plate 6 to the middle, similar to the shape of a "convex" character. In practice, the step structure can be changed to an outward-lifting step that rises from the middle of the vertical frame plate to both ends, similar to the shape of a "concave" character. The center-lifting step and the outward-lifting step are respectively arranged symmetrically relative to the center line of the vertical frame plate 6, and can actually be changed to an asymmetrical arrangement.

[0034] As an embodiment different from the above, the support legs are located at the top of the frame plate, and the step structure is located at the bottom of the vertical frame plate. The step structure is a centrally descending step that descends from both ends of the vertical frame plate to the middle, similar to an inverted "concave" shape, or the step structure is an outwardly descending step that descends from the middle to both ends of the vertical frame plate, similar to an inverted "convex" shape. Similarly, the centrally descending step and the outwardly descending step are respectively arranged symmetrically or asymmetrically relative to the center line of the vertical frame plate.

[0035] Of course, in addition to the different ways of forming steps between the two ends and the middle of the vertical board mentioned above, the step structure can actually be changed to an asymmetric step that descends or rises from one end of the vertical board to the other end, a single step or multiple steps.

[0036] Classified by the transition method of the steps, the step structure is as follows Figure 3 、 6 , 90° corner flat steps shown in 7 and 8, as Figure 4 The inclined steps 12 shown or Figure 5 The arcuate step 13 is shown.

[0037] Classified by the location of the steps, the step structures include: Figures 6 to 8The transverse steps 14 between the ends and the top of the beam, the longitudinal steps 15 between the sides and the top, and the lateral steps 16 between the ends and the sides are shown.

[0038] In actual manufacture, the step structure is integrally cast on the beam, or the step structure is manufactured separately and then assembled on the beam.

[0039] In other embodiments, the beam 6 can be thick at both ends and thin in the middle, thereby forming a step structure. Even the entire beam 6 can be in a step structure, or the upper, middle or lower part of the beam can form a step structure.

[0040] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection mode in the prior art, which will not be described in detail here.

[0042] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A stepped tube sheet comprising a vertical web, a frame, and support legs. The vertical web is provided with a plurality of support holes for passage of furnace tubes. The side walls of the vertical web are provided with reinforcing ribs, the reinforcing ribs and the support holes being staggered. The frame surrounds the vertical web, and the support legs are fixed to the outside of the frame. The invention is characterized by: A step structure is provided on the peripheral side of the vertical frame plate; the step structure is a corner plane step, an inclined surface step or a curved surface step.

2. The stepped tube sheet according to claim 1, wherein: The support legs are located at the bottom of the frame plate, and the step structure is a centrally raised step that rises from both ends of the vertical frame plate to the middle, or the step structure is an outwardly raised step that rises from the middle to both ends of the vertical frame plate, and the centrally raised step and the outwardly raised step are respectively arranged symmetrically or asymmetrically relative to the center line of the vertical frame plate.

3. The stepped tube sheet according to claim 1, wherein: The support legs are located at the top of the frame plate, and the step structure is a centrally descending step that descends from both ends of the vertical frame plate to the middle, or the step structure is an outwardly descending step that descends from the middle of the vertical frame plate to both ends, and the centrally descending step and the outwardly descending step are respectively arranged symmetrically or asymmetrically relative to the center line of the vertical frame plate.

4. The stepped tube sheet according to claim 1, wherein: The step structure is an asymmetrical step that descends or rises from one end of the vertical panel to the other end.

5. The stepped tube sheet according to claim 1, wherein: The step structure includes a transverse step between the end and the top of the vertical frame board, a longitudinal step between the side and the top, and a lateral step between the end and the side.

6. The stepped tube sheet according to claim 1, wherein: The step structure is integrally formed on the vertical frame plate, or the step structure is manufactured in parts and then assembled on the vertical frame plate.

7. The stepped tube sheet according to claim 1, wherein: The vertical frame is thick at both ends and thin in the middle, thereby forming the step structure.

8. The stepped tube sheet according to claim 1, wherein: The vertical frame plate is in a stepped structure as a whole, or the upper part, middle part or lower part of the vertical frame plate forms the stepped structure.

9. An industrial furnace comprising a furnace wall, end tube sheets, lugs, an intermediate tube sheet, and a coil, wherein the end tube sheets are fixed to both ends of the furnace wall to form a furnace chamber, the lugs are fixed to the inner side of the furnace wall, the intermediate tube sheets are distributed along the interior of the furnace wall, the coil comprises a plurality of furnace tubes and a plurality of elbows, the furnace tubes pass through support holes in the intermediate tube sheet and the end tube sheet, and the elbows connect the plurality of furnace tubes, and the furnace furnace is characterized by: The intermediate tube sheet is a stepped tube sheet as described in any one of claims 1 to 8.

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