Radiant tubular element for industrial plants

Abstract

The utility model relates to a kind of radiation tubular elements (10) for industrial equipment, the radiation tubular element is made of high-temperature-resistant metal material, including at least one substantially linear tubular portion (12), and possibly equipped with at least one curved tubular portion (14), wherein, this radiation tubular element includes multiple radiation and reinforcing devices (18) placed on the at least a portion of the outer surface (S) of radiation tubular element (10).

Description

Technical Field

[0001] This utility model relates to a radial tubular element for industrial equipment and similar applications, which can be used in the steel processing industry.

[0002] More specifically, this utility model relates to a radiating tubular element, which is applicable to heat treatment furnaces, galvanizing production lines, and annealing processes for steel strips or sheets and / or steel-based products. Background Technology

[0003] In the field of steel heat treatment, especially for steel sheets used in the automotive industry, a specific type of radiant tube is used. This radiant tube is made of a high-temperature resistant material and is connected to a burner that can generate the required temperature, allowing sheet metal passing through in a continuous strip to undergo the necessary heat treatment.

[0004] Radiant tubes used in industry can take various shapes, the most common of which can be defined as "U," double "U," "W," single "P," "M," or double "P." These radiant tubes are connected to burners in which combustion occurs. Typically, these tubes have a central section where the flame and / or smoke from the burner flows directly, and may also have transverse sections where the combustion smoke can circulate. The combustion smoke passes through the tube and is brought to a temperature that allows for heat exchange with the material being treated via radiation.

[0005] Known radiant tubing, due to its requirement for high-temperature resistance, is typically manufactured using a centrifugal process and then welded to any bends or flanges to allow for the desired final shape.

[0006] However, currently used radiant tubes have some drawbacks. In particular, they have a roughly circular cross-section and a limited radiating surface that is confined to the outer surface of the tube itself.

[0007] Furthermore, due to the high temperatures they are subjected to, the known radiant tubes will collapse and fold on their own. This means that in certain areas, their radiant power will decrease, resulting in uneven heat treatment of the steel products produced by this process, and the radiant tubes themselves must be replaced immediately. Utility Model Content

[0008] Therefore, the technical objective of this utility model is to improve upon the existing technology in this field.

[0009] In this technical task, one object of the present invention is to provide a radiating tubular element having at least a larger radiating surface compared to tubular elements known in the art.

[0010] Another objective of this invention is to produce a radiating tubular element that allows temperature to be homogenized along its entire extension or surface, reducing mechanical and thermal stresses (and overcoming the critical problems associated with tubular components with uneven temperature).

[0011] This task and this objective are achieved by a radiating tubular element as described below.

[0012] This utility model relates to a radiating tubular element for industrial equipment, which can be used in heat treatment furnaces, galvanizing and annealing lines for steel products. The radiating tubular element has an outer surface suitable for connection to a burner and is made of a high-temperature resistant metal material capable of withstanding temperatures of at least 300°C. It includes at least one generally straight tubular portion and a radiation and reinforcement device, wherein the radiation and reinforcement device is located only in a portion or half of the radiating tubular element and is located in a region far from or further away from the burner during use.

[0013] Preferably, at least one generally straight tubular portion may include at least one generally straight tubular portion having a smooth surface and another generally straight tubular portion having a radiation and reinforcement device.

[0014] Preferably, the radiating tubular element may have a “U” shape, a “double U” shape, a “W” shape, or an “M” shape, a “P” shape, or a “double P” shape, and includes at least one curved tubular portion and at least one connecting element for connecting and engaging at least one generally straight tubular portion with at least one curved tubular portion.

[0015] Preferably, at least one generally straight tubular portion with a smooth surface may be positioned in a first region of the radiating tubular element, the first region being the lower part, the generally straight tubular portion with a smooth surface being connected to the burner in use and reached by the flame from the burner, while another generally straight tubular portion with radiation and reinforcement devices is positioned in a region at or further away from the burner in use, and is not reached by the flame from the burner but is reached by combustion smoke in use, wherein the region at or further away from the burner is the upper part compared to the first region.

[0016] Preferably, the radiant tubular element can have a W-shaped or M-shaped shape. In use, there are two generally straight tubular portions with smooth surfaces, positioned in a first region, in the lower part of the radiant tubular element. There are also two other generally straight tubular portions with radiation and enhancement devices, positioned in a region further away from the burner, in the upper part of the radiant tubular element during use, and vice versa.

[0017] Preferably, the radiation and reinforcement device can also be located at at least one curved tubular section.

[0018] Preferably, each of the radiating and strengthening devices may be a boss and / or a protrusion and / or a corrugation relative to the outer surface, and / or a mesh element and / or an element capable of increasing the radiating surface and strengthening the radiating tubular element.

[0019] Preferably, each of the radiating and reinforcing devices and bosses may have a rectangular, circular, elliptical, polygonal, mesh-like, or composite planar shape, or each of the radiating and reinforcing devices and bosses may have rounded edges.

[0020] Preferably, the size of each radiation and enhancement device can range from 0.2 cm to 200 cm or from 0.2 cm to 20 cm, and protrude from the outer surface from 0.2 cm to 8 cm or from 0.1 cm to 10 cm.

[0021] Preferably, the radiation and enhancement devices can be arranged in a substantially linear manner in rows and columns, with vertical devices alternating with horizontal devices.

[0022] Preferably, the radiating and reinforcing devices can be arranged in rows or columns that advance substantially parallel to each other, wherein the rows or columns are parallel to or perpendicular to the longitudinal axis of the substantially straight tubular portion, wherein the radiating and reinforcing devices 8 are staggered with respect to adjacent rows or columns, or wherein each radiating and reinforcing device in the first row or column is substantially positioned in the free space left between two radiating and reinforcing devices in the row or column adjacent to the first row or column.

[0023] Preferably, in at least one curved tubular section, the radiating and reinforcing devices can be arranged in substantially curved rows or columns, wherein one of the radiating and reinforcing devices in the first row is staggered relative to the radiating and reinforcing devices present in the adjacent rows.

[0024] Preferably, it may include at least one support device for supporting at least a portion of the radiating tubular element in place, wherein the at least one support device is positioned between two adjacent generally straight tubular portions, or between at least one curved tubular portion and a support or buffer structure, which in use connects the proximal end of the radiating tubular element to a burner and / or to a collector or recovery unit.

[0025] Preferably, at least one support device may include a first support device relative to the burner in use, the first support device being located between a second and a third of a generally straight tubular portion from the top, or between two central portions of a generally straight tubular portion, at the distal region or end of the respective generally straight tubular portion.

[0026] Preferably, at least one support device may include a second support device positioned, with respect to the use of the burner, between the third and fourth generally straight tubular portions from the top, or positioned in the last two generally straight tubular portions, in the proximal region or end of the respective generally straight tubular portions.

[0027] Preferably, at least one support device may be positioned between two generally straight tubular portions having smooth surfaces, and / or between two other generally straight tubular portions having radiation and reinforcement devices, and / or between a generally straight tubular portion having smooth surfaces and another generally straight tubular portion having radiation and reinforcement devices.

[0028] Preferably, at least one support device may include a support element positioned at the curved tubular portion, the support element being closest to the support or cushioning structure during use.

[0029] Compared with existing tubular fittings, the specific construction of the radiative tubular element according to this invention allows for better radiation performance in terms of the amount and uniformity of radiation processed, while also having higher strength and a longer service life.

[0030] The radiating tubular element according to this invention also reduces harmful emissions caused by the combustion process itself, ensuring a more environmentally friendly product compared to currently available products on the market. Attached Figure Description

[0031] The features of this invention will be better understood by each person skilled in the art from the following description and accompanying drawings, which are provided by way of non-limiting example, wherein: Figure 1This is a front view of a radial tubular element according to one version of the present invention; Figure 2A-2D This is a front view of a version of the radiating tubular element according to the present invention, wherein the support device varies according to some examples based on different possible handles of the radiating element itself; Figures 3A-3D This is a front view of a version of the radiating tubular element according to the present invention, corresponding to the version in Figure 2, but with different positioning based on the position of the burner, wherein the support device varies according to some examples based on different possible handles of the radiating element itself. Figure 4A and 4B These are two front views of another version and another variation of the radiating tubular element according to this utility model; Figure 5A and 5B These are two front views of another version and another variation of the radiating tubular element according to this utility model; Figure 6A This is a perspective view of one version of the radiating element according to the present invention; Figure 6B It is based on Figure 6A Plan view of two radiation and enhancement devices of this utility model; Figure 6C yes Figure 6B A perspective view of the two devices shown; Figure 7 This is an internal view of one version of the radial tubular element according to the present invention, particularly according to Figure 6A The version. Detailed Implementation

[0032] Referring to the accompanying drawings, a radiating tubular element according to the present invention is shown, generally indicated by 10.

[0033] The radial tubular element 10 may include at least one generally straight tubular portion 12. According to at least one version of the present invention, the radial tubular element 10 may include at least one curved tubular portion 14 and at least one connecting element 16.

[0034] At least one connecting element 16, which may be in the form of a welded part and / or a known joint, connects and joins at least one generally straight tubular portion 12 to at least one curved tubular portion 14.

[0035] The radiating tubular element 10 may have a “U” shape, a double “U” shape, a “W” shape, an “M” shape, a “P” shape, a “double P” shape, or any other configuration suitable for this purpose.

[0036] Each portion 12, 14 of the radiating tubular element 10 has a generally circular cross-section, but it may also have other types of cross-sections without departing from the scope of protection of this utility model.

[0037] The radiating tubular element 10 can be made of a high-temperature resistant metallic material, possibly in the form of a metallic alloy, particularly capable of withstanding temperatures of at least up to 1300°C, such as: nickel and chromium alloys, for example Inconel 600, 601, or 602; Incoloy 800; Incoloy 800H; AISI 304-310-309S-316-316Ti; 330; 321; Avesta 235MA; aluminum-iron alloys (ALUFER); Alloy X; APM; APMT; MA230; MA250; nickel-resistant cast iron; or other cast iron derivatives; castings of any type or method; centrifugal castings, such as Gx40CrNi. 26-20, KHR48N, KHR35H, centrifugal castings or investment castings containing or without nickel and containing chromium, aluminum, etc., or forged and / or extruded tubes and / or other metallic and non-metallic materials suitable for this purpose.

[0038] Each part 12, 14 includes a tubular wall with a thickness of approximately 0.5-20 mm, 2-12 mm, or approximately 0.5-12 mm, depending on the material it is made of.

[0039] The radiant tubular element 10 includes a first end region adapted to be connected to a burner 1 and a second end region adapted to be connected to a collector or recovery unit 2 for recovering combustion smoke after the combustion smoke has passed through the interior of the radiant element itself.

[0040] In the accompanying drawings, the first end region and the second end region are both located on the same side of the furnace or along the same wall of the furnace, but this may vary depending on the specific construction of the radiant tube itself.

[0041] The radiating element 10 may also include at least one support device or rod 19, which is adapted to support the radiating element on the opposite side or wall of the furnace relative to the location of the burner 1.

[0042] The radiating tubular element 10 includes a plurality of radiating and enhancing devices 18 disposed on at least a portion of the outer surface S of the radiating tubular element 10.

[0043] A feature of this invention is that the radiating tubular element 10 has no radiation and enhancement devices 18 on its entire surface S. In fact, the area or portion of the radiating element near and / or close to the burner does not include any radiation and enhancement devices 18.

[0044] Instead, this radiation and enhancement device 18 is specifically placed on at least some areas or portions of the radiant tubular element 10 that are not in direct contact with the flame of the burner 1.

[0045] According to at least one version of the present invention, the radiation and enhancement device 18 is thus positioned at the distal end of the burner 1 or at a location away from the burner 1. Thus, for example, if the burner 1 is located in the lower portion of the radiating tubular element 10, the radiation and enhancement device 18 is located in the upper portion of the radiating tubular element 10, and vice versa.

[0046] As a non-restrictive example, such as Figure 2A-2D As shown in Figures 4A and 5A, the radiating tubular element 10 has a generally straight tubular portion 12a equipped with a smooth surface and positioned at the lower portion of the radiating element connected to the burner 1, where the flame of the burner 1 can reach. The radiating element also includes another generally straight tubular portion 12b equipped with a radiating and enhancing device 18 positioned at the upper portion, which is not reached by the flame of the burner 1 but only by the combustion smoke of the radiating element itself.

[0047] The generally straight tubular portion 12a, typically made of casting, has a wall thickness typically between 5 mm and 16 mm.

[0048] According to the examples shown in these figures, since the radiating element 10 has a W or M-shaped configuration, there are two generally straight tubular portions 12a with smooth surfaces, both of which are placed in the lower portion of the radiating element, or in any case in the same first portion, and there are two generally straight tubular portions 12b with radiating and strengthening devices 18, both of which are placed in the upper portion of the radiating element 10, or in any case in the same second portion.

[0049] exist Figures 3A-3D In another version of the present invention shown in 4B and 5B, the radiating tubular element 10 includes a generally straight tubular portion 12a with a smooth surface, located in the upper portion of the radiating element, connected to the burner 1, and reached by the flame from the burner 1. The radiating element also includes another generally straight tubular portion 12b, equipped with a radiating and intensifying device 18 and positioned in the lower portion, where the flame from the burner 1 cannot reach, and only the combustion smoke of the radiating element itself reaches.

[0050] According to the examples shown in these figures, in the case of a radiating element 10 having a W-shaped or M-shaped configuration, there are two generally straight tubular portions 12a with smooth surfaces, both of which are located in the upper portion of the radiating element or in any case in the same second portion; there are also two generally straight tubular portions 12b with radiating and strengthening devices 18, both of which are located in the lower portion of the radiating element 10 or in any case in the same first portion.

[0051] Radiation and reinforcement devices 18 are disposed in the regions of the radiating tubular element 10, where larger radiating surfaces and / or better structural reinforcement are required, while potentially avoiding the formation of turbulence or eddies in the same or closest to the hotter parts of the burner 1.

[0052] According to one version of the present invention, the radiation and enhancement device 18 is disposed only at at least one generally linear tubular portion 12, 12b.

[0053] However, in Figure 1 In the version shown, a radiation and reinforcement device 18 is also provided at at least one curved tubular portion 14. Specifically, since the radiating element has a W-shaped or M-shaped configuration, this radiation and reinforcement device 18 is located in two of the three curved tubular portions 14 present, that is, in the second and third portions 14b, in addition to the first portion 14a which is closer to the burner 1.

[0054] The radiation and strengthening device 18 allows for a range of advantages associated with the radiation capability of the radiating tubular element 10, such as: higher thermal radiation efficiency, increased overall radiation surface area, and better thermal radiation uniformity, thereby resulting in steel products that are better processed and thus have better performance.

[0055] The radiating and reinforcing device 18 also allows for a range of advantages related to the stiffness of the radiating tubular element, such as: reduced deformation over time; increased durability over time; greater absorption of mechanical waves generated by the operation of the connected burner 1 and the tubing itself, which could exert mechanical stress on the radiating tubular element 10, causing it to break or deform; reduced elongation due to deformation of the radiating tubular element 100 itself, or more compliant elongation; and greater resistance to thermal shock from temperature variations between 600°C and 1300°C caused by heating and cooling.

[0056] Furthermore, due to the presence of the radiation and enhancement device 18, better flame vortexes can be obtained within the radiant tubular element 10, since the turbulence generated in all areas of the element 10 is the same, which determines the acceleration of the generated smoke. In this way, a shorter ignition time is achieved in the burner 1, and the associated consumption is also reduced. This acceleration of the smoke results in greater combustion during the return phase, thereby reducing emissions of harmful substances such as nitrogen oxides and their mixtures.

[0057] Each radiation and reinforcement device 18 may be a boss of any geometry (circular, elliptical, rectangular, square, etc.), and / or a protrusion of any size, and / or a corrugation protruding from the surface S of the radiation tubular element 10, and / or a mesh element, and / or any other element capable of increasing the internal and / or external radiation surface and reinforcing the radiation tubular element 10 itself.

[0058] Each radiation and enhancement device 18 has a rectangular, square, elliptical, triangular, polygonal, mesh-like, or rounded edge structure in the plan view.

[0059] The three-dimensional structure of each device 18, especially when it is a protrusion, can be a dome, hemisphere, ellipsoid or semi-ellipsoid, cone, pyramid, frustum, prism, parallelogram, with smooth edges or vertices, etc.

[0060] In particular, the three-dimensional construction of each device 18 and / or protrusion can be a complex and / or composite solid.

[0061] For example, in Figure 6A , 6B In the embodiment shown in 6C, it is understood that each device 18 and / or protrusion has a generally three-part construction, wherein its two end portions 18a are generally shaped as a semi-cone or part of a cone, preferably mirror-symmetrical, with recesses facing each other, while its middle portion connects the two end portions 18a by means of two generally rectangular, square, or trapezoidal faces or walls 18b, these two faces or walls preferably mirror-symmetrical to each other and inclined toward each other at their common upper side 18c. This common upper side substantially connects the two vertices of the semi-cone. In plan view, the device 18 or protrusion has a generally rectangular or square construction at the central portion and a semi-circular construction at the two end portions.

[0062] The radiation and enhancement device 18 can be obtained by processing the material constituting the radiating tubular element 10, such as molding it (or the wall constituting it) on a particular mold, or pressing it using a suitable press or other equipment suitable for this purpose.

[0063] In one version of this invention, the radiation and reinforcement devices 18 can be obtained by applying them to the outer surface S of the radiating tubular element 10, for example by applying a weld to a workpiece that has already been formed or molded, or by any type of melting or pressure melting, or by any other method involving raising the material from a flat surface.

[0064] In fact, in this way, the radiating surface of the radiating tubular element is increased, and its structure is also strengthened, making it more resistant to mechanical and dynamic stresses, such as vibrations caused by the burner 1 and / or its operation.

[0065] For larger sizes, the dimensions of each radiating and reinforcing device 18 can range from 0.2 cm to the entire length or perimeter / circumference of the tube; for smaller sizes, the range can be from 0.2 cm to 20 cm, or typically from 0.2 cm to 200 cm. Each radiating and reinforcing device 18 protrudes from the outer surface S of the radiating tubular element 10 by approximately 0.1–10 cm or 0.2 cm–8 cm. Typically, the smaller and / or larger dimensions of each device 18 are 4 mm.

[0066] Each radiation and enhancement device 18 may be made of the same material constituting the radiation tubular element 10 or other similar materials suitable for this purpose.

[0067] This at least one radiating and reinforcing device 18 has a specific arrangement and shape, such that the final result has the desired reinforcing properties. In particular, the forming of the radiating and reinforcing device 18 is prevented from causing cracks, fissures and / or unwanted deformations that could weaken the overall structure of the radiating tubular element 10 itself.

[0068] In an exemplary and non-limiting version of this invention, a plurality of radiation and amplification devices 18 are present on the outer surface S of the radiating tubular element 10, these devices being positioned in substantially linear rows and columns, such as... Figure 2A-2D As shown in 3A-3D and 6A, vertical elements are alternated with horizontal elements, or they can be arranged in rows or columns in a substantially parallel orientation, such as... Figure 4A , 4B As shown in 5A and 5B.

[0069] Specifically, such as Figure 5A and 5B As shown, the rows or columns of radiating and reinforcing devices 18 arranged along them can be parallel to the longitudinal axis of the generally straight tubular portions 12, 12b, or as shown in the diagram. Figure 4A and 4B As shown, they can be perpendicular to the longitudinal axis of the generally straight tubular portions 12, 12b.

[0070] In at least one version of this invention, as shown in the accompanying drawings, the radiating and reinforcing devices 18 are staggered relative to each other, taking into account adjacent rows or columns. It can be noted that, in fact, each device 18 in the first row or column is positioned in the “free” space left between two adjacent devices 18 in the row or column adjacent to the first row or column.

[0071] In another alternative embodiment, not shown, the radiation and enhancement device 18 may be arranged in a mesh pattern, such as a mesh of any shape and size.

[0072] exist Figure 1 In the version shown, within the generally linear tubular portion 12b, there are elements 18 arranged in essentially linear rows and columns, such as Figure 2A-2D As shown in 3A-3D and 6A-6C, vertical elements are alternated with horizontal elements, that is, adjacent devices 18 are aligned and staggered. However, this alignment may or may not be maintained in the curved tubular portion 14b. For example, in Figure 1 In the version shown, the elements 18 in the curved section 14b are arranged along a straight line, the route of which is substantially parallel to the route of the curve, and thus substantially arranged along the curve. Similarly, in this case, the elements in the first row can be staggered relative to the alignment of adjacent rows.

[0073] The radiation and enhancement device 18 may also have other arrangements without departing from the scope of protection of this utility model. Each radiation and enhancement device 18 is defined with a maximum thickness variation of ±10% relative to the wall thickness of the radiation tubular element 10.

[0074] In a non-limiting version of this invention, at least one support device 11 may be provided to support at least a portion of the radial tubular element 10 in place.

[0075] The at least one support device 11 can be positioned between two adjacent, generally linear tubular portions 12 (e.g., as shown in the image). Figure 2D and 3D (as shown in the image).

[0076] In particular, for example, a single support device 11a may be present between the second generally straight section and the third generally straight section 12 (counting from the top in the figures), in which case such a support device is positioned at the distal region or end of the respective generally straight section 12 relative to the wall of the furnace where the burner is placed.

[0077] According to another variation, in addition to the aforementioned support device 11a, a second support device 11b may also exist, which is positioned between the third generally straight tubular portion and the fourth generally straight tubular portion 12 (counted from the top in the figures). In this case, the support device 11b is positioned relative to the wall of the furnace where the burner is placed in the proximal region or end of the corresponding generally straight portion 12.

[0078] According to another version, at least one support device 11 may be positioned between two smooth, generally linear portions 12a, and / or between two generally linear portions 12b equipped with radiating and reinforcing devices 18, and / or between a smooth, generally linear portion 12a and a generally linear portion 12b equipped with radiating and reinforcing devices 18.

[0079] Alternatively, at least one support element 11c may be present, adapted to connect at least one curved tubular portion 14 to a support or buffer structure 21 that connects the proximal end of the radiating tubular element 10 to the burner 1 and / or collector 2.

[0080] According to one version of the present invention, at least one support device 11c is positioned at the curved tubular portion 14 closest to the support or buffer structure 21. In the case of a radial tubular element 10 shaped like a W or M, as shown, the support device 11c is positioned approximately halfway down the element itself, in the portion or area of ​​the furnace wall closest to where the burner 1 is located.

[0081] At least one support device 11 is placed in a region of the tubular element 10 that is particularly sensitive to temperature changes, which may fail or deform due to exposure to vibrations or high temperatures generated during the operation of the element 10. Therefore, the at least one support device 11 ensures the structural stability of the entire system.

[0082] In particular, at least one support device 11 may be located near the area or part where flames and high-temperature smoke are most likely to accumulate (such as the curved tubular section 14), where flames and high-temperature smoke cause the material forming the tubular element 10 to heat up more quickly, thus making the tubular element more susceptible to damage or failure.

[0083] The number and location of at least one support device 11 may also depend on the type of at least one support member or rod element 19 present. In particular, at least one support member or rod element 19 is located in the distal region or end of the radiating element 10, especially on the wall opposite the location where the burner 1 is located.

[0084] As shown in the accompanying drawings, the support member or rod assembly 19 may have various constructions known in the art.

[0085] For example, in Figure 2A and 3A In the burner 1, there are two support devices or rods 19, each positioned at a curved tubular portion 14 located distal to the burner 1 (and taking into account the W or M shape of the radiating element 10). These support devices or rods have a generally tubular shape, preferably with a circular cross-section. These rods are substantially identical.

[0086] exist Figure 2B and 3B In this structure, there is a support element or rod 19 positioned at two curved tubular portions 14 located distal to the burner 1 (and taking into account the W or M shape of the radiating element 10). The shape of this support device 19 differs from previous ones, particularly at the lower curved portion 14, where a support device 19a with a protruding shape is present, and a connecting rod 19b is provided between the support device 19a and the support device 19c located at the upper curved portion 14. Specifically, the device 19a has a larger protruding extension than the device 19c, which essentially serves only as a connector for connection to the rod 19b.

[0087] exist Figure 2C and 3C In the example, there is a support device or rod 19, the shape of which is similar to... Figure 2B The shapes are basically corresponding, but essentially inverted. In this case, there is a device 19c, whose protruding extension is larger than that of device 19a, because the latter protrudes less and is basically only used as a connecting joint with rod 19c.

[0088] Finally, Figure 2D and 3D In one example, there is a single support or rod 19 positioned at a curved tubular portion 14 below or at the lower part of the radiating element 10. In this case, the rod 19 has an elongated protruding shape, a base that is substantially rectangular, triangular, trapezoidal, or any other suitable shape, and may be equipped with one or two sidewalls that, together with the aforementioned base, define a substantially U-shaped cross-section.

[0089] Figure 4A-5B The most widely used support or rod 19 on the market is described in a non-restrictive manner.

[0090] Naturally, different configurations of the radial tubular element 10 may require different configurations, placements, or numbers of support elements or rods 19.

[0091] Typically, the support or rod 19 protrudes toward the furnace wall opposite the location of the burner 1.

[0092] Therefore, it can be seen that the present invention essentially presents a first half of a radiating element 10 equipped with a radiating and strengthening device 18, such as a first half located near a heat exchanger or collector 2; and a second half of a radiating unit 10 without a radiating and strengthening mechanism 18 and thus having a smooth outer surface S, such as a second half located near a burner 1.

[0093] According to a first version of the present invention, these first and second halves may apply only to at least one of the generally straight tubular portions 12. According to another version, in addition to the generally straight portions 12, these first and second halves may also involve curved tubular portions 14 (if present).

[0094] In this way, it is possible to keep the temperature of the radiating element 10 uniform, taking into account both the area closer to the burner 1 and the area further away from the burner 1, such as the area located at the heat exchanger or collector 2 for combustion smoke.

[0095] Similarly, compared to known radiating elements, this invention allows for the absorption of mechanical and thermal stresses experienced by radiating elements, while limiting harmful emissions caused by combustion itself.

[0096] Therefore, it has been demonstrated how this invention achieves its intended objectives.

Claims

1. A radiating tubular element (10) for industrial equipment, which can be used in heat treatment furnaces, galvanizing and annealing lines for steel products, wherein, The radiant tubular element (10) is provided with an outer surface (S) suitable for connection to the burner (1) and is made of a high-temperature resistant metal material capable of withstanding temperatures of at least 1300°C. It includes at least one generally straight tubular portion (12) and a radiation and reinforcement device (18). The radiation and reinforcement device (18) is characterized in that it is located only in a portion or half of the radiant tubular element (10) and, in use, is located in a region at or further away from the burner (1).

2. The radiating tubular element (10) according to claim 1, characterized in that, At least one of the generally straight tubular portions (12) includes at least one generally straight tubular portion (12a) with a smooth surface and another generally straight tubular portion (12b) with the radiation and enhancement device (18).

3. The radiating tubular element (10) according to claim 1 or 2, characterized in that, The radial tubular element (10) has a "U", "double U", "W", "M", "P" or "double P" shape and includes at least one curved tubular portion and at least one connecting element (16) for connecting and engaging at least one of the generally straight tubular portions (12) with at least one of the curved tubular portions.

4. The radiating tubular element (10) according to claim 1 or 2, characterized in that, At least one of the generally straight tubular portions (12a) provided with a smooth surface is located in a first region of the radiating tubular element (10), the generally straight tubular portion (12a) provided with a smooth surface is connected to the burner (1) in use and is reached by the flame from the burner, while another generally straight tubular portion (12b) provided with the radiating and strengthening device (18) is located in the region at or further away from the burner (1) in use and is not reached by the flame of the burner (1) but is reached by the combustion smoke, wherein the region at or further away from the burner (1) is the upper part compared to the first region.

5. The radiating tubular element (10) according to claim 4, characterized in that, The radiant tubular element (10) has a W-shaped or M-shaped shape. In use, there are two generally straight tubular portions (12a) with smooth surfaces, which are located in the first region, in the lower part of the radiant tubular element (10). There are also two other generally straight tubular portions (12b) with the radiation and enhancement device (18), which are located in the far side or further region relative to the burner (1), in use in the upper part of the radiant tubular element, and vice versa.

6. The radiating tubular element (10) according to claim 3, characterized in that, The radiation and reinforcement device (18) is also located at at least one of the curved tubular portions.

7. The radiating tubular element (10) according to claim 1 or 2, characterized in that, Each of the radiation and enhancement devices (18) is a boss and / or a protrusion and / or a corrugation relative to the outer surface (S), and / or a mesh element and / or an element capable of increasing the radiation surface and enhancing the radiation tubular element (10).

8. The radiating tubular element (10) according to claim 7, characterized in that, Each of the radiation and enhancement device (18) and the boss has a circular, elliptical, polygonal, mesh-like or composite planar shape, or each of the radiation and enhancement device (18) and the boss has rounded edges.

9. The radiating tubular element (10) according to claim 8, characterized in that, Polygons include rectangles.

10. The radiating tubular element (10) according to claim 1 or 2, characterized in that, Each radiation and enhancement device (18) has a size ranging from 0.2 cm to 200 cm or 0.2 cm to 20 cm, and protrudes from the outer surface (S) by 0.2 cm to 8 cm or 0.1 cm to 10 cm.

11. The radiating tubular element (10) according to claim 1 or 2, characterized in that, The radiation and enhancement devices (18) are arranged in a basically linear row and column arrangement, with vertical devices alternating with horizontal devices.

12. The radiating tubular element (10) according to claim 1 or 2, characterized in that, The radiating and amplifying devices (18) are arranged in rows or columns that advance in substantially parallel directions, wherein the rows or columns are parallel to or perpendicular to the longitudinal axis of the generally straight tubular portion (12), wherein the radiating and amplifying devices (18) are staggered relative to each other, or wherein each of the radiating and amplifying devices (18) in the first row or column is substantially positioned in the free space left between two of the radiating and amplifying devices (18) present in the row or column adjacent to the first row or column.

13. The radiating tubular element (10) according to claim 3, characterized in that, In at least one of the curved tubular sections, the radiation and reinforcement devices (18) are arranged in substantially curved rows or columns, wherein one of the radiation and reinforcement devices (18) in the first row is staggered relative to the radiation and reinforcement devices (18) present in the adjacent rows.

14. The radiating tubular element (10) according to claim 3, characterized in that, Includes at least one support device (11) for supporting at least a portion of the radiating tubular element (10) in place, wherein at least one of the support devices (11) is positioned between two adjacent generally straight tubular portions (12), or between at least one of the curved tubular portions and a support or buffer structure (21), which in use connects the proximal end of the radiating tubular element (10) to the burner (1) and / or to the collector or recovery unit (2).

15. The radiating tubular element (10) according to claim 14, characterized in that, At least one of the support devices (11) includes a first support device (11a) relative to the burner (1) in use, the first support device (11a) being located between the second and the third of the generally straight tubular portions (12) from the top, or between the two central portions of the generally straight tubular portions (12), at the distal region or end of the respective generally straight tubular portions (12).

16. The radiating tubular element (10) according to claim 14 or 15, characterized in that, At least one of the support devices (11) includes a second support device (11b) positioned, with respect to the use of the burner (1), between the third and fourth of the generally straight tubular portions (12) from the top, or in the last two of the generally straight tubular portions, in the proximal region or end of the respective generally straight tubular portion (12).

17. The radiating tubular element (10) according to claim 14 or 15, characterized in that, At least one of the support devices (11) is positioned between two generally straight tubular portions (12a) with smooth surfaces, and / or between two other generally straight tubular portions (12b) with the radiation and reinforcement device (18), and / or between the generally straight tubular portion (12a) with smooth surfaces and the other generally straight tubular portion (12b) with the radiation and reinforcement device (18).

18. The radiating tubular element (10) according to claim 14, characterized in that, At least one of the support devices (11) includes a support element (11c) positioned at the curved tubular portion, the support element (11c) being closest to the support or buffer structure (21) in use.

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