• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Radiation tube (III) for heating an industrial furnace, which radiation tube comprises an elongate body (III) with. a longitudinal shaft (L), which elongate body is arranged to extend into a piece in the furnace space from a furnace cradle, a furnace roof or furnace floor (l00), and a connecting part (l30), which connecting part is arranged to connect the radiation tube to a bushing ( l0l) through the oven cradle, the oven roof or the oven floor. The invention is characterized in that the connecting part is arranged to rotatably connect the elongate body about the longitudinal axis relative to the furnace cradle, the furnace ceiling or the furnace floor and in that it elongates to the furnace cradle, the furnace roof or the furnace floor, the elongate body. at. its surface comprises at least one convection-increasing member (120), arranged to increase the convective heat transfer between the radiating tube and the furnace atmosphere when the radiating tube is hotter than the furnace atmosphere and the elongate body is rotated about the longitudinal axis. The invention also relates to a convection-increasing device and to a method. Application text document 2011-05-10 110026EN
    公开号:SE1150414A1
    申请号:SE1150414
    申请日:2011-05-10
    公开日:2012-11-11
    发明作者:Mats Gartz
    申请人:Idevo Ab；
    IPC主号:
    专利说明:

    Another problem is that the radiation tube, when very hot, becomes soft and that its free spirit therefore tends to bend downwards in the direction of gravity. To remedy this, various support means, for example hanging from the ceiling, are conventionally used to hold up the free end. Alternatively, the radiation tube runs across the furnace, all the way to an opposite furnace wall 'and. kept up with. a support body at. the opposite wall. Such solutions entail increased furnace complexity and reduced freedom with regard to the choice of furnace geometry, and are therefore not desirable.
    The present invention solves the problems described above.
    The Swedish patent application SE 1050078-3 describes a rotatable seal for sealingly connecting two furnace parts to each other.
    The invention relates to a radiating tube for heating an industrial furnace, which radiating tube comprises an elongate body with a longitudinal axis, which elongate body is arranged to extend into a piece in the kiln space from a kiln wall, a kiln roof or kiln floor, and a connecting part, which connecting part is arranged to connect the radiation tube. to a bushing 'through the furnace wall, furnace ceiling or furnace floor, which radiating tube is characterized in that the connecting part is arranged to rotatably about the longitudinal axis in relation to the furnace wall, furnace fence or furnace floor connect the elongate body to the furnace wall, furnace ceiling or furnace wall or furnace ceiling. the elongate body at its surface comprises at least one convection increasing means, arranged to increase the convective heat transfer between the radiating tube and the furnace atmosphere when the radiating tube is hotter than the furnace atmosphere and the elongate body is rotated about the longitudinal axis.
    The invention further relates to a convection-increasing device for detachable mounting on a radiation tube, which radiation tube is arranged for heating an industrial furnace and comprises an elongate body with a longitudinal axis, which is arranged to stretch a piece into the furnace space from a furnace wall, furnace ceiling or furnace floor, which device is characterized in that the convection-increasing device comprises at least one convection-increasing means arranged to be fixed in a position at the outer surface of the elongate body when the convection-increasing device is and in that the convection increasing device, when firstly the convection increasing device is mounted on the radiating tube, secondly the radiating tube is hotter than the furnace atmosphere and thirdly the elongate body is rotated, is arranged to increase the convective heat transfer between the radiating tube and the furnace atmosphere.
    In addition. The invention relates to a method for heating an industrial furnace by means of a radiation tube, comprising an elongate body with. a longitudinal axis, said elongate body being arranged to extend a piece into the furnace space from a furnace wall, a furnace ceiling or furnace floor, and a connecting part, said connecting part being arranged to connect the radiating tube to a bushing through the furnace wall, furnace roof or furnace floor, which , in a first step, the connecting part is arranged to rotatably about the longitudinal axis relative to the oven wall, the oven fence or the oven floor connect the elongate body to the oven wall, the oven roof or the oven floor, and the elongate body is provided with at least one convection increasing means. increase the convective heat transfer between the radiant tube and the furnace atmosphere when the radiant tube is warmer than the furnace atmosphere and the elongate body is rotated about the longitudinal axis; and in that in an second step, the elongate body during operation is caused to rotate about the longitudinal axis.
    The invention will now be described in detail, with reference to exemplary embodiments of the invention and the accompanying drawings, in which: Figure 1a is a perspective view of a first radiation tube according to the present invention; Figure 1b is a perspective view of the radiation tube of Figure 1a partially removed; Figures 2 and 3 are perspective views of a second and a third radiation tube, respectively, according to the present invention; Figure 4a is a perspective view of a fourth radiation tube according to the present invention, Figure 4b is a detail view of the radiation tube of Figure 4a partially removed, Figure 4c is a detail view of the radiation tube of Figure 4a; and Figure 4d is a detailed perspective view of the radiation tube of Figure 4a partially removed.
    The figures share reference numerals for the same parts.
    Figures 1a and 1b show a wall 100 belonging to an industrial furnace. It will be appreciated that the wall 100 may be a side wall, a ceiling wall or a floor wall in the furnace in question. Hereinafter, the term "wall" is used herein to describe such a more general wall of an industrial furnace. The wall 100 has an inner side 102, facing the oven space, and an outer side 103.
    The industrial furnace can be any industrial furnace, such as a furnace for heating metal products, in particular for the production and processing of steel products, glass melting, waste incineration Application text docs 2011-05-10 110026EN 10 15 20 25 30 and so on. tube 110, The furnace is arranged to be heated by a radiation comprising an elongate body III with a longitudinal axis L. The elongate body III is arranged to extend a distance into the furnace space from the inner side 102 of the furnace wall 100. According to a preferred embodiment, the elongate body extends. lll substantially horizontally, or at least along a direction having a horizontal component, into the furnace. This also applies to the other embodiments described below.
    A heating means (not shown in Figures 1a and 1b) is arranged to heat. a space l12 in the radiating tube l10, the outer surface of the radiating tube l10 becoming hot and in turn heating the oven space. The heating means may, for example, consist of a burner for solid, liquid or gaseous fuel which is combusted together with air or another oxidant, preferably an oxidant with an oxygen content of at least 85%.
    Other examples of suitable heating means include an electric heating device.
    Furthermore, the radiating tube 110 comprises a connecting part 130, which is arranged to connect the radiating tube 110 to a passage 101 through the furnace wall 100. It is preferred that the elongate body III of the radiating tube 111 run through the bushing 110 and. from at least to the outer surface l03 of the furnace wall 100.
    According to the invention, the connecting part 103 is arranged to connect the elongate body III to the furnace wall 101 rotatably about the longitudinal axis IJ in 101. relation to the furnace wall In other words, the connection 132 is arranged so that the elongate body III, and thus the entire part of the radiation tube 110 located in the furnace space, can rotate about the longitudinal axis L.
    Application text docs 2011-05-10 110026EN 10 15 20 25 30 In Figures 1a and 1b, a rotatable, sealing connection l40, arranged on the outer side 103 of the wall 100, connects the outer surface of the radiation tube 1010 to the outer side of the wall 100. The rotatable seal, 140 is provided. to prevent furnace atmosphere gases from leaking into or out of the furnace space through the passage 101 from or to the ambient atmosphere, which is preferable since such leakage is undesirable in many applications.
    It is also preferred that the portion 14O of the connection 132 which allows a rotating connection of the elongate body III is arranged entirely outside the wall 101, in order to protect the connection 132 against the aggressive environment of the furnace space. To reduce the risk of heat radiation from the furnace space damaging the components of the radiating tube 110, and to reduce the friction between the part of the surface of the elongate body which passes through the bushing 10 and the inner walls of the bushing 10 during rotation of the radiating tube 110 therein, it is preferred that a heat-resistant insert, preferably of ceramic felt, is arranged in the gap between the outer walls of the mounted radiation tube 10 and the inner walls of the bushing 10 in the bushing 1010 itself.
    Furthermore, according to the invention, the elongate body III at its surface comprises at least one convection increasing means 120, which is arranged to increase the convective heat transfer between the radiation tube 110 and the furnace atmosphere when the radiation tube 110 is and when it is warmer than the furnace atmosphere L. The convection-increasing means l2O are suitably designed so that when rotating the elongate body lll they set the atmosphere in the vicinity of the means l2O in motion by means of the means l2O of the means around the elongate body lll surface by Application text dococ 2011- 05-10 110026SE 10 15 20 25 30 the latter's rotation. To achieve this, such convection-seeking means 120 can, of course, be designed in a variety of ways, some of which are exemplified herein. Common to such means, however, is that they protrude a piece in the radial direction from the surface of the elongate body III and thus comprise at least one convection driving part which, when the elongate body III rotates and the convection driving part thereby moves circumferentially around the elongate part 11 surface, is arranged to move a surrounding gas so that convection thereby occurs.
    Thereby the advantage is achieved that the convective heat transfer between the radiation tube 110 and the furnace space increases, and thus. also the heat transfer to a material that. should be heated in the oven compartment. Since the radiating tube 110 is rotated during the heating operation, even if it enters the furnace, even if the tube 110 is softened by the elevated temperature and even if the tube 110 is mounted horizontally from a side wall of the furnace, it will not bend down in the direction of gravity.
    Thus, in this case, no supporting structures are needed in the furnace, which results in reduced installation complexity and increased geometric flexibility. According to a preferred embodiment, the vanes are further designed as. along the elongate body lll stretching, equidistant around the elongate body lll cross-section arranged, structures' as. act as beams in the sense that they cause the elongated body lll to have a bending stiffness which is at least 50% greater in all bending angles than what would have been the case without the vanes.
    The convection increasing means 120 illustrated in Figures 1a and 1b comprise a plurality of vanes extending along the axis direction and extending out from the mantle surface of the radiation tube, according to a preferred embodiment in the form of curved blades. during rotation, set the surrounding furnace atmosphere in motion and thereby increase the convection and thus also the heat transfer from the radiation tube. llO. At least one such vane is required in order to achieve increased convection in this way.
    In Figures 1a and 1b, the convection increasing means 120 are shown as fixed parts of the radiation tube 110. According to a preferred embodiment, however, the radiation tube comprises one detachably mounted on the radiation tube. convection enhancing device; In this. cases are the convection-increasing bodies. of at least one, on. the convection-increasing device arranged, convection-increasing means, which are further arranged to be fixed in a position at the mantle surface of the radiation tube when the convection-increasing device is mounted on the radiation tube. In a manner similar to that of the convection-increasing means 120, the convection-increasing device is arranged to, through the convection-increasing means of the convection-increasing device, increase the convective heat transfer between the radiation tube and the furnace atmosphere when the convection-increasing device is mounted on the radiation tube. warmer than the oven atmosphere and the elongated body is rotated.
    With such a construction, the advantage is achieved that an existing radiation tube can be upgraded with a convection-increasing device according to the invention for operation with improved convective installation cost heat transfer, which entails reduced nades. Alternatively, it can be achieved that a standard type radiation tube can be combined with a convection enhancing device without requiring special adaptation before use according to the present invention.
    Application text document 2011-05-10 110026EN 10 15 20 25 30 The convection-increasing device can be detachably mounted in different ways, such as by means of screw connections which are arranged to engage in holes in the radiation tube, for example with internal threads, with metal clamps or on other appropriate means. The fact that the convection-increasing device is “detachably mounted” shall be interpreted as meaning that the device does not form an integral part of the radiation tube in the same body of material, but can be dismantled from the radiation tube with the aid of suitable tools.
    Figures 2, 3, 4a and 4b illustrate various examples of such convection enhancing devices which are releasably mounted on a respective radiation tube. It will be appreciated that the various types of convection enhancing means illustrated in Figures 2, 3, 4a and 4b, son1 in these figures * constitute * parts * of a respective convection enhancing device, can advantageously also be arranged as permanently installed parts on a radiation tube on a manner similar to that illustrated in Figures 1a, 1b.
    Figure 2 thus shows an oven wall 200, comprising a bushing '201, an inner side 202 and. an outer side 203. A radiating tube 210 is mounted through the bushing 201, in a manner similar to the mounting of the radiating tube 110 shown in Figures 1a and 1b. The radiating tube 210 comprises an elongate body 211 with a longitudinal axis L. On the radiating tube 210 there is a detachably mountable convection increasing device 220 mounted, by means of mounting means 221 which are arranged to attach the device 220 to the elongate body 110 so that the convection increasing device 220 means, in the form of vanes similar to the vanes 120 and thus consisting of curved blades, run at and along the surface of the elongate body 211, and so that the convection increases upon rotation of the radiating tube 210 as described above.
    Application text dococ 2011-05-10 110026EN 10 15 20 25 30 10 Figure 3 shows a radiation tube 310 similar to that in figure 2, comprising an elongate body 311 with a longitudinal axis L, and mounted through a bushing 301 in an oven wall 300 which in turn comprises an inner side 302 and an outer side 303. On the elongate body 311 of the radiating tube 310, a detachably mountable convection increasing device 320 is mounted by means of mounting means 321, on a set corresponding to the mounting 221 illustrated in Figure 2 by means of the mounting means The convection increasing device 320 comprises convection-increasing means in the form of a helical body running along and around the surface of the elongate body 311, which helical body forms vanes to set the furnace atmosphere in motion.
    Figures 4a and 4b illustrate another preferred convection-seeking device 420, mounted on an elongate body 411 of a radiation tube 410 which is associated with a longitudinal direction L. The radiation tube 410 is mounted through a bushing 401 through an oven wall 400, which in turn comprises an inner side 402 and an outer side 403. The convection-increasing device 420 comprises convection-increasing means, which are releasably mounted at the surface of the elongate body 411 by means of mounting means 421. The convection-increasing means form vanes in the form of a plurality of separate propeller blade as. are preferably equidistantly mounted along and around the elongate body 411, preferably in a spiral pattern along the longitudinal axis L.
    The convection-increasing means illustrated in Figures 1a, 1b and 2 are, thus, arranged to, when the respective radiation tube is rotated, circulate. gas sonx * surrounds the respective member in a direction substantially perpendicular to the longitudinal axis L, out from the surface of the respective elongate body.
    Application text docs 2011-05-10 110026EN 10 15 20 25 30 ll On the other hand, the convection-increasing means illustrated in Figure 3 is arranged that, when the radiating tube 310 is rotated, gas circulating the means in a direction substantially parallel to the longitudinal axis L , parallel to the surface of the elongate body 311.
    A third alternative is illustrated in Figures 4a and 4b, where the convection-increasing means are arranged to, when the radiation tube 410 is rotated, circulate gas surrounding the means in a direction obliquely out from the surface of the elongate body 411, which direction in other words has a component perpendicular to the longitudinal axis L and one component parallel to the longitudinal axis L.
    Figures 4a-4d illustrate a preferred embodiment, according to which the connecting part 430, in addition to a first rotatable, tapping connection 440, arranged to connect the elongate body 411 to the furnace cradle 400, also comprises a second rotatable, tapping connection 450 which is arranged to connect the elongate body 411 to a heating means inside the heating 411. 460 which is arranged in the space 412 the elongate body The heating means 460 may, as described above, comprise for instance an electric heater or a burner, and is arranged to be stations and thus not rotate about the longitudinal axis L reaches the elongate body 411 rotates about the longitudinal axis L. The second rotatable body 450 is arranged to prevent gases from leaking into or out of the space 412 in the elongate body 411 and thereby exchanges with the surrounding atmosphere.
    Thus, the elongate body 411 is rotatably suspended in two rotating connections 440, 450, the first 440 connecting the radiating tube 410 to the outside of the furnace wall 400 Application text docs 2011-05-10 110026SE 10 15 20 25 30 l2 403 and the second 450 connecting the radiating tube 410 the heating means 460. A per se conventional drive device (not shown) for applying rotation to the elongate body 411 can be arranged to engage in the part of the elongate body 411 arranged between the rotatable seals. In this way, an existing radiation tube can be easily converted to rotary operation according to the invention, without any major changes to the heating means. This construction is especially preferred when operating with a burner which. heating means, since. existing connections for fuel, oxidant and exhaust gases' can then be retained, despite the radiation tube. 410 is rotatable.
    According to a particularly preferred embodiment 1, at least the first 440 or the second 450 rotatable seal, 450, preferably both the rotatable seals 440, are of the rotatable, coolant-sealed type described in the Swedish patent application SE l050078-3. According to a preferred embodiment, however, only the first rotatable seal 440 is of this type, and the second rotatable seal 450 is a conventional, rotatable sliding seal with sliding surfaces of, for example, Teflon.
    Figures 4c and 4d show in detail a radiating tube 41 whose first 440 and other 450 rotatable seals are of the above-mentioned type, the radiating tube 4110 comprising, 450, SOITI GD part of each of these seals 440, a circular connecting part 444 and 454, respectively. , suitably. in shape. of a flange extending from the outer surface of the elongate body 411. The connecting portions 444 and 454, respectively, comprise a plate 445a and 455a, respectively, extending perpendicularly from the outer surface of the elongate body 41 and running peripherally around this surface, and a circular edge 445b and 455b, respectively, extending from the respective plate 445a, 455a at a angle in relation to the plate. 445a, 455a and. thus, the foot forms the L-shape of the flange, and which, moreover, in the rest position is advantageously substantially parallel to the outer surface of the elongate body 41.
    Closing tightly against the furnace wall 400 and the heating means 460, there is also arranged a circular connecting part 441 and 451, respectively, in the form of a tube 442 and 452, respectively, extending around the bushing 401 and the heating means 460, respectively, comprising a longitudinal opening or notch 443 and 453 respectively. to receive and. housing the respective flange 445b, 455b. The respective pipe 442, 452 further comprises * a tight connection part to the outer surface. of the furnace wall 100 and the heating means 460, respectively.
    The two circular 441, 444 and the connecting parts 451, 454, respectively, are arranged to engage in pairs and sealingly connect to each other so that the elongate body 411 is rotatably arranged relative to both the outer surface 403 of the furnace wall 100 and the heating means 460 at the respective engagement between the connecting parts 441, 454. 444 and 451, respectively. This is accomplished by passing an end portion of the respective edge 455b 453, circular 445b, through. the respective groove 443, and is allowed to run inside and along the respective tube 442, 452, 452 in angular direction. in such a way that the end part is freely rotatable in the tube 442, the tube 442 and 452, respectively, are further designed so that it springs back towards a position where the respective groove 443, 453 is closed, and. the tube is also arranged to enclose. the respective circular edge 445b, 455b along the entire or at least substantially the entire length of the edge 445b, 455b when the elongate body 411 is tightly connected to the furnace wall 400 and the heating means 460, respectively. The resilient action of the respective tube 442, 452 is thus achieved in this case Application text dococ 2011-05-10 110026EN 10 15 20 25 30 l4 in that the tube 442, 452 itself is formed in a resilient neutral or comprises spring means which lower the tube 442, 452 back to a position in which the respective notch 443, 453 are closed.
    According to an alternative preferred embodiment, however, the respective tube 442, 452 is made of a rigid material, preferably metal, and comprises an inner tube made of a flexible material. The inner tube includes in this case, in a manner similar to. the tube, a longitudinal notch, 445b, arranged to receive and accommodate the end portion of the circular edge 455b.
    Such a construction. results in * a robust and heat-resistant 'yet simple and thus cost-effective solution.
    The inner tube can be made of a resilient material, it can for example be designed as. a thick rubber tube with the notch as a longitudinal and continuous cut.
    According to a preferred embodiment, however, the outer diameter of the flexible tube, when the tube is at rest, is larger than the inner diameter of the outer tube, the edges of the flexible tube at the notch being bent or folded towards the center of the outer tube when mounted in the respective the outer tube 442, 452 and when the end portion of the respective circular edge 445b, 455b is inserted through the grooves. This results in a very good seal during operation as described below.
    According to a particularly simple and therefore preferred embodiment, it is flexible. the tube designed as. a mat of flexible material, 442, advantageously wider than the inner circumference of the respective outer tube 452, which mat in the resting state is substantially flat but which is rolled into a tube shape when it mounted in the outer tube 442, 452.
    It is also possible to supplement a resilient outer and tubular 442, 452, respectively, with a respective inner, flexible tube as above.
    A liquid coolant is arranged to flow continuously through the respective tube 442, 452, filling substantially the entire space defined by the combination of the inner surfaces of the respective tube 442, 452 and the outer surfaces of the respective circular edge 445b, 455b. If several concentric tubes are used, for example a respective inner flexible tube together with a respective outer rigid tube 442, 452 as described above, the coolant is arranged to flow through the inner tube and substantially fill the entire space defined by the combination. of the inner surfaces of the inner tube and the outer surfaces of the circular edge 445b, 455b.
    The coolant is preferably water, but may be any suitable liquid coolant, such as water with a conventional friction reducing and / or suitable abrasion reducing additive or a suitable, conventional, low friction liquid cooling medium.
    A supply device is arranged to continuously supply the coolant to the respective tube 442, 452 at a respective point located on the tube at the top in the direction of gravity. A removal system is arranged to continuously discharge the coolant from the respective pipe 442, 452 by means of gravity, for example via leakage from the respective pipe 442, 452 through the groove 443 and 453, respectively, or through leaks or other openings in the respective pipe 442, 452. According to a preferred embodiment, the refrigerant is recirculated by a circulating device, by collecting the refrigerant under the respective rotatable seal 440, 450 and then pumping it back to the supply device.
    Because the refrigerant flows continuously through the respective pipe 442, 452, it is cooled efficiently during operation, and it is therefore possible to achieve a satisfactory service life of the pipe 442, 452. Furthermore, the spring action of the pipe 442, 452 ensures back to the position where it respectively the crowd 443, 453 is closed, that the crowd 443, 453 close tightly around the outer sides of the 455b. That is to be interpreted as the respective edge of the circular edge 445b, the pipes 443 and 453, respectively, "closes tightly" as meaning that no gas can pass through the joint 443, 453 when the respective pipe 442, 452 is filled with coolant. The refrigerant, on the other hand, may leak through the respective crowd 443, 453, although it is preferred that the crowd 443, 455b to some extent, 453 be so closed around the respective edge 445b, the leakage per unit time of coolant through the crowd 443, 453 is so large in relation to the total amount of refrigerant that appropriate circulation of refrigerant. obtained in the respective tube 442, 452.
    As described above, the respective pipe 442, 452 is tightly attached to the furnace cradle 100 and the heating member 460 via the respective connecting part 441, 451. In addition, the connecting part 444, 454 is itself tightly attached to the elongate body 411. Furthermore, an overpressure inside the respective tube 442, 452 due to the liquid column of coolant inside the tube 442, 452 being questioned, which causes 452 inner surfaces in the 445b, 455b volume defined by the tube 442, in combination with the outer surfaces of the respective circular edge is always completely or substantially completely filled with refrigerant during operation. This provides an effective seal between the elongate body 411 on the one hand and the furnace wall 400 and the heating means 460, respectively, on the other hand, so that atmospheric air cannot leak into or out of the furnace space. the respective space 412 inside the elongate body 411 via one of the rotatable seals 440, 450.
    When the present invention is to be applied, in one which is 410 first steps, a connecting part 130, 430 as above, 210, 310, 301, 200, is arranged. connecting a radiating tube 110, as above, to a bushing 101, 201, 401 through an oven wall, an oven roof or oven floor 100, 300, 400, to be rotatable relative to the oven wall, 211, 311, about the longitudinal axis L of an elongate body 111, 411 of the radiation tube, connect the elongated body to the oven wall in question.
    In addition, the elongate member is provided at its surface with at least one convection increasing member 120, 220, 320, 420 as above, arranged to increase the convective heat transfer between the radiant tube and the furnace atmosphere when the radiant tube is hotter than the furnace atmosphere and the elongate body is rotated around the longitudinal axis.
    This first step is thus performed before heating operation is started. Advantageously, an existing radiation tube can be used, which is then provided with at least one convection-increasing member which is mounted on the radiation tube so that the convection-increasing member is fixed to the mantle surface of the radiation tube.
    According to one embodiment, such an existing radiation tube, alternatively a radiation tube of standard design intended for non-rotatable installation, is supplemented with a detachably attached convection increasing device as above and a rotatable, sealing connection as above for rotating operation. In addition, control and drive means are installed for the rotating operation of the existing radiating tube or radiating tube of standard design and possibly also cooling medium for one or more rotatable seals as described above. Such a radiation tube can also be provided with permanently attached, convection-increasing means, which can, for example, be welded to the surface of the radiation tube. at least one According to a preferred embodiment. an existing hole is used through an oven wall, an oven roof or oven floor, through which an existing radiation tube has been made, whereby the hole is made larger so that its diameter increases, and whereby a friction reducing and corroding inlay, such as a ceramic felt insert, is arranged around it. enlarged inside of the hole so that the insert surrounds the radiation tube when it is installed through said hole for rotary heating operation. In a second radiating tube, the elongate part of the radiating tube is then rotated about the longitudinal axis by means of a rotational motion-applying device such as a conventional electric motor.
    Preferred embodiments have been described above. However, it will be apparent to those skilled in the art that many changes may be made to the described embodiments without departing from the spirit of the invention.
    For example, only one or more of several radiation tubes present in an industrial furnace can be adapted for rotary operation according to the method described above. Alternatively, all such existing radiation tubes can be adapted for rotary operation.
    Thus, the invention should not be limited by the described embodiments, but may be varied within the scope of the appended claims.
    Application text document 2011-05-10 110026EN
    权利要求:
    Claims (14)
    [1]
    1. A radiating tube (110; 2010; 310; 410) for heating an industrial furnace, which radiating tube comprises an elongate (L), elongate body is arranged to extend into a piece of body (l11; 211; 311; 411) with a longitudinal axis which in the furnace space from a furnace wall, (100; 200; 300; 400), a furnace roof or furnace floor and a connecting part (130; 430), which connecting part is arranged to connect the radiating tube to a bushing (10l; 20l; 30l; 40l) ) through the furnace wall, furnace ceiling or furnace floor, characterized in that the connecting part is arranged to rotatably around the longitudinal axis in relation to the furnace wall, furnace fence or furnace floor connect the elongate body to the furnace wall, furnace fence or furnace floor, and by surface comprises at least one convection increasing means (120; 220; 320; 420), arranged to increase the convective heat transfer between the radiation tube and the furnace atmosphere when the radiation tube is hotter than the furnace atmosphere and the longitudinal the drawn body is rotated about the longitudinal axis.
    [2]
    Radiation tube (110; 2110; 3110; 4110) according to claim 1, characterized in that the connecting part (130; 430) comprises a first rotatable seal (140; 440) which connects the elongate body (III; 211; 3ll; 4ll) to the furnace wall, furnace ceiling or furnace floor (100; 200; 300; 400), and in that the first rotatable seal is arranged to prevent furnace atmosphere gases from leaking into or out of the furnace space through the bushing (l0l; 20l; 30l; 40l).
    [3]
    Radiation tube (410) according to claim 1 or * 2, characterized in that the connecting part (430) comprises a second rotatable seal (450) (41) which connects * the elongate body to a heating means (460), arranged to Application text docs 2011-05-10 110026EN 10 15 20 25 30 20 heat a space (412) inside the elongate body and arranged not to rotate about the longitudinal axis (L) when the elongate body rotates about the longitudinal axis, and for the other rotatable seal to be arranged to prevent gases from leaking into or out of the space in the elongate body.
    [4]
    Radiation tube (110; 2010; 310; 410) according to claim 2 or 3, characterized in that at least the first (140; 440) of (450) rotatable seal comprises a (444,454) or the second first circular connecting part and a other circular connection part (44l, 451), which circular connection parts are arranged to grip. into and sealingly connect. in that the first circular connecting part internally (445b, 455b), which is arranged to run (443,453), forms a circular edge inside and along one provided with a longitudinal notch, extending along the second circular connecting part and to the second connecting part connected tube (442,452), so that the circular edge is freely rotatable in the tube, in that the tube is designed so that it springs back towards a position where the groove is closed and the tube is arranged to enclose the circular edge along substantially the entire can. length of ten. when the connection parts. are tightly connected. to each other, the groove closing tightly around the outer sides of the circular edge, and in that a liquid cooling medium is arranged to flow through the tube in this position and substantially fill the entire space defined by the combination of the inner surfaces of the tube and the outer edge of the circular edge. surfaces. (110) any one of the preceding claims,
    [5]
    5. Radiation tube according to the characterized in that the convection-increasing member (120) forms a fixedly arranged part of the radiation tube. Application text document 2011-05-10 110026EN 10 15 20 25 30 35 2l (220; 320; 420) (2lO; 3l0; 4l0),
    [6]
    A convection-increasing device for detachable mounting on a radiation tube, which radiation tube is arranged for heating an industrial furnace and comprises an elongate body (211; 311; 411) with a longitudinal axis (L), which is arranged to extend into a piece in the oven space from an oven wall, an oven ceiling or an oven floor (200; 300; 400), characterized in that the convection-increasing device comprises at least one convection-increasing means arranged to be fixed in a position at the elongate body. mantle surface when the convection-increasing device is centered on the radiation tube, and by the fact that the convection-increasing device, when firstly the convection-increasing device is centered on the radiation tube, secondly the radiation tube. is 'warmer than' the oven atmosphere. and thirdly, the elongate body is rotated, is arranged to increase the convective heat transfer between the radiant tube and the furnace atmosphere.
    [7]
    Radiation tube (20; 1010; 40) according to any one of claims 1-4, characterized in that the radiation tube comprises a convection-increasing device (220; 320; 420) releasably mounted on the radiation tube according to claim 6, and in that the convection-increasing device convection-increasing organs constitute the convection-increasing organs of the radiation tube.
    [8]
    Radiation tube (110; 20; 1010; 41) or convection enhancing device (220; 320; 420) according to any one of the preceding claims, characterized in that at least one of said convection enhancing means in the condition comprises at least one along the axis direction ( L) and out of the radiating tube's mantle surface extending paddle.
    [9]
    Radiation tube (110; 20; 10, 10; 41) or convection enhancing device (220; 320; 420) according to claim 8, characterized in that at least one of said convection enhancing means is Applicable text document 2011-05-10 110026SE 10 15 20 25 30 22 arranged, when the radiating tube is rotated, to circulate gas as convection-increasing means in a direction which is (L), substantially parallel to the longitudinal axis or a direction surrounding it substantially perpendicular to the longitudinal axis, a direction having a component perpendicular to the longitudinal axis and a grain component parallel to the longitudinal axis.
    [10]
    10. l0. A method of heating an industrial furnace by means of (110; 2110; 310; 410), (III; 211; 311; 411) comprising an (L), which elongate body is arranged to extend into a radiating tube elongate body with a longitudinal axis a furnace roof or (130: 430), the furnace space from a furnace wall, (l00; 200; 300; 400), a piece in the furnace floor and a connecting part which connecting part is arranged to connect the radiation tube to a bushing (l0l; 20l; 30l; 40l) through the furnace wall, furnace roof or furnace floor, characterized in that in a first step, the connecting part is arranged to be rotatably about the longitudinal axis relative to the furnace wall, furnace roof or furnace floor connecting the elongate body to the furnace wall, furnace roof and furnace floor, at its surface is provided with at least one convection-increasing means (120; 220; 320; 420), arranged to increase the convective heat transfer between the radiating tube and the furnace atmosphere when the radiating tube is hotter than the furnace the mosphere. and. the elongate body is rotated about the longitudinal axis; and in that in a second step, the elongate body during operation is caused to rotate about the longitudinal axis. k ä n n e t e c k n a t
    [11]
    11. ll. A method according to claim 10, a V wherein the connecting part (l30; 430) in the first step is caused to comprise a first rotatable seal (l40; 440) which connects the elongate body (lll; 211; 311; 411) to the furnace wall , the furnace ceiling or the furnace floor (l00; 200; 300; 400), wherein the first rotatable seal is arranged to prevent furnace atmosphere gases 'from leaking into i_ or xn: ur'. the oven space through the bushing.
    [12]
    12. A method according to claim 10 or 11, characterized in that the connecting part (430) in the first step is made to include. a second rotatable seal (450) connecting the elongate body (411) to a heating means (460), the heating means being arranged to heat a space (412) inside the elongate body (411) and arranged not to rotate about the longitudinal axis (L) when the elongate body rotates about the longitudinal axis, the second rotatable seal being arranged to prevent gases from leaking into or out of the space in the elongate body. k ä n n e t e c k - 440)
    [13]
    A method according to claim 11 or 12, wherein at least the first (140; or (450) seal is caused to comprise a (444; 454) second rotatable first circular connecting portion and a second circular connecting portion (441; 451) , which circular connecting parts engage in and sealingly connect to each other, by causing the first circular connecting part to comprise (445b; 455b) which is arranged to run inside (443; 453) a circular edge and along one with a longitudinal notched, extending along the second circular connecting part and tubing (442; 452) connected to the second connecting part, so that the circular edge is freely rotatable in the tube, by causing the tube to be designed so that it springs back towards a position where the groove is closed and the tube is arranged to enclose the circular edge along substantially the entire length of the edge when the connecting parts are tightly connected to each other, the groove closing tightly around the circular the outer sides of the tube, and by causing a liquid medium in the second stage to flow through the tube and substantially fill the entire space defined by the combination of the inner surfaces of the tube and the circular edge of the tube. outer surfaces.
    [14]
    14. A method according to claims 10-13, according to any one of the first (210; 310; 410), (211, 311; 411) drawn by the step, an existing radiation tube comprising an elongate body for heating an oven space, provided with at least one convection-increasing member (220; 320; 420) mounted on the radiation tube so that the convection-increasing member is fixed to the outer surface of the elongate body. Application text document 2011-05-10 110026EN
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    同族专利:
    公开号 | 公开日
    SE535843C2|2013-01-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2015-02-24| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150414A|SE535843C2|2011-05-10|2011-05-10|Radiation tubes provided with convection enhancing means and method for heating an industrial furnace|SE1150414A| SE535843C2|2011-05-10|2011-05-10|Radiation tubes provided with convection enhancing means and method for heating an industrial furnace|
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