Revision system, and method for operating the revision system for renewing a refractory lining in a furnace housing of a furnace, in particular an electric arc furnace

Abstract

The invention relates to an improved revision system (10) and an improved method for operating the revision system (10), wherein the revision system (10) comprises at least one extraction device (15) and a melting furnace vessel (30), wherein the melting furnace vessel (30) extends along an axis (35) and comprises a refractory lining (65), a furnace floor (130), an interior space (60), and a furnace wall (50) which adjoins the furnace floor (130) and peripherally delimits the interior space (60), wherein the melting furnace vessel (30) has, in the furnace wall (50), a first opening (135) with a furnace door (150) and a second opening (140) arranged axially opposite the furnace floor (130) with respect to the axis (35), wherein the refractory lining (65) covers at least part of an inner side (55) of the melting furnace vessel (30), wherein the furnace door (150), when closed, closes the first opening (135) and, when open, permits access to the interior space (60) through the first opening (135), wherein the extraction device (15) has at least one extraction pipe (70) and a conveying device (75), wherein a pipe opening (110) of the extraction pipe (70) is arranged at the first opening (135), wherein the conveying device (75) is designed to extract dust-laden exhaust air (85) from the interior space (60) through the first opening (135) and the pipe opening (110) into the extraction pipe (70), and fresh air (190) is to be supplied into the interior space (60) through the second opening (140).

Description

[0001] Description

[0002] Inspection system and method for operating the inspection system for renewing a lining in a furnace casing of a furnace, in particular an arc furnace

[0003] The invention relates to an inspection system according to patent claim 1 and a method for operating the inspection system according to patent claim 9.

[0004] WO 2012 / 035611 A1 discloses a method and a device for recovering a metal from electric furnace dust.

[0005] DE 28 49 137 A1 discloses a mobile catching and transport table for a blast furnace excavation.

[0006] From US 2022 / 057141 A1, a plant for recycling contaminated, in particular asbestos-containing, metal scrap is known, comprising a furnace frame and a tiltable melting furnace arranged therein.

[0007] To replace the lining of an arc furnace vessel, a demolition machine is introduced into the interior of the vessel through a lid opening. An extraction hood is then installed above the lid opening to extract dust-laden air from the interior of the vessel during demolition work to remove the lining. Access to the interior of the vessel can be achieved, for example, through the lid opening or a slag opening.

[0008] It is an object of the invention to provide an improved inspection system and an improved method for operating the inspection system for renewing a lining of a melting furnace vessel, preferably an arc furnace.

[0009] This object is achieved by means of an inspection system according to claim 1 and by means of a method according to claim 9. Advantageous embodiments are specified in the dependent claims.

[0010] It has been recognized that an improved inspection system and an improved method for operating the inspection system for renewing the lining of a melting furnace vessel, in particular of an arc furnace, can be provided in that the inspection system has at least one extraction device, a demolition machine, and a melting furnace vessel. The melting furnace vessel extends along an axis and has a lining, a furnace floor, an interior space, and a furnace wall that adjoins the furnace floor and circumferentially delimits the interior space. The melting furnace vessel has a first opening in the furnace wall with a furnace door. The demolition machine is arranged in the interior space. Furthermore, the melting furnace vessel has a second opening arranged axially opposite the furnace floor with respect to the axis. The lining covers at least portions of an inner side of the melting furnace vessel and preferably of the furnace door.When closed, e.g., during melting of the melting furnace vessel, the furnace door closes the first opening, and when open, the interior is accessible through the first opening. The extraction device comprises at least one extraction pipe and a conveying device, with a pipe opening of the extraction pipe being arranged at the first opening. The conveying device is designed to extract dust-laden exhaust air from the interior via the first opening and the pipe opening into the extraction pipe, and to supply fresh air into the interior via the second opening.

[0011] This design has the advantage that the dust-laden exhaust air is extracted through the first opening close to the furnace floor, thus preventing dust from settling on the furnace floor. Furthermore, the dust concentration near the heads of people working inside is reduced.

[0012] In a further embodiment, the extraction pipe has a first pipe section, a pipe joint, and a second pipe section. The pipe joint connects the first pipe section to the second pipe section such that the first pipe section can be pivoted relative to the second pipe section between a first position and a second position. The pipe mouth is arranged opposite the pipe joint. In the first position, the pipe mouth is arranged at the first opening, wherein in the second position the pipe mouth is arranged at a greater distance from the first opening than in the first position. In the second position, for example, the conveying device is deactivated. This configuration has the advantage that there is sufficient installation space to move the melting furnace vessel into an inspection position in the inspection system in the second position.

[0013] In a further embodiment, the melting furnace vessel has an upper vessel and a lower vessel, the lower vessel being trough-shaped. The upper vessel is hollow and extends along the axis. The upper vessel has the second opening and a lower opening, the upper vessel being arranged on the lower vessel at the lower opening. The first opening is arranged axially between the second opening and the lower opening. This configuration has the advantage that the first opening is arranged closer to the bottom of the lower vessel, thus ensuring that the dust-laden exhaust air is extracted close to the floor.

[0014] It is particularly advantageous if the first opening is designed as a slag opening for the removal of liquid slag that can be arranged in the interior. During operation of the arc furnace, the slag can float on a molten mass, for example, a metallic melt, especially a steel melt, in the melting furnace vessel and be poured off through the first opening. The slag opening has the advantage of being located particularly close to the bottom and thus lower than other openings. Furthermore, it can be closed by the furnace door.

[0015] It is also particularly advantageous if the inspection system has a sealing device. The sealing device is preferably arranged at the outlet of the extraction pipe. The sealing device is designed to at least partially close a gap between the outlet of the extraction pipe and the first opening. The sealing device ensures high suction power and efficient removal of the dust-laden exhaust air from the interior of the melting furnace vessel, and prevents the intake of external air, in particular fresh air, through the gap from the environment of the inspection system at the outlet.

[0016] In a further embodiment, the extraction pipe has a reversibly lockable escape door. The escape door is arranged, for example, adjacent to the pipe mouth. The escape door is closed when the conveyor system is activated. This provides a second escape route for people working inside the melting furnace vessel via the extraction system and the extraction pipe. This ensures that people can quickly leave the interior, even in the event of a fire, for example.

[0017] In a further embodiment, the extraction device has a grid. The grid is arranged at the pipe outlet or in the extraction pipe. The grid preferably has a mesh size of 2 cm up to and including 15 cm. This configuration has the advantage that the suction of flat, lightweight building materials, for example foils or paper or packaging waste, can be avoided, particularly by the extraction near the floor, as these are retained by the grid. This prevents unwanted blockage of the filter device or the conveying device. In a further embodiment, the furnace door is closed during melting of the melting furnace vessel and prevents the escape of liquid material, in particular melting material and / or slag, from the interior.

[0018] It is particularly advantageous if the inspection system described above is operated by positioning the extraction pipe with the pipe outlet at the first opening. The lining is removed using the lining machine. When the lining is removed, the conveyor system is activated and the conveyor system extracts dust-laden exhaust air from the interior of the melting furnace vessel via the first opening and the extraction pipe. Fresh air is fed into the interior via the second opening. Suctioning close to the ground has the advantage that a particularly large amount of dust stirred up when the lining is removed, which occurs particularly close to the ground, for example when bricks fall to the ground, is extracted particularly quickly.

[0019] In a further embodiment, the melting furnace vessel is transported to an inspection station, with the furnace door being opened. The first pipe section is pivoted from the second position to the first position, and the pipe mouth is positioned at the first opening. After the lining demolition is complete, the first pipe section is pivoted to the second position. This allows the melting furnace vessel to be transported away from the inspection station without the pipe section arranged laterally in the first position on the melting furnace vessel getting in the way.

[0020] The invention is explained in more detail below with reference to FIGS. In the following:

[0021] FIG 1 is a perspective view of an inspection system;

[0022] FIG 2 is a sectional view along a sectional plane AA shown in FIG 1 through the revision system shown in FIG 1;

[0023] FIG 3 is a further perspective view of the inspection system shown in FIGS 1 and 2;

[0024] FIG 4 is a plan view of the inspection system shown in FIGS 1 to 3;

[0025] FIG. 5 is a perspective view of a section of the extraction device shown in FIGS. 1 to 4. FIG. 6 is a flowchart of a method for operating the inspection system shown in FIGS. 1 to 5; and

[0026] FIG 1 shows a perspective view of an inspection system 10.

[0027] In the following figures, reference is made to a coordinate system for ease of orientation. The coordinate system has an x-axis (longitudinal direction), a y-axis (transverse direction), and a z-axis (height direction). The coordinate system, for example, is designed as a rectangular system.

[0028] In the embodiment, the inspection system 10 comprises a suction device 15, a transport frame 20, a demolition machine 25 (essentially hidden in FIG 1) and a melting furnace vessel 30.

[0029] The melting furnace vessel 30 is designed to melt a solid material under the influence of heat. The melting furnace vessel 30 can be, for example, an arc furnace. In the arc furnace, heat for melting a molten material into a melt can be generated by means of an arc generated between electrodes. For example, a metal, such as iron, steel, scrap, copper, silver, lead, or an amorphous material, such as glass, can be melted in the melting furnace vessel.

[0030] The melting furnace vessel 30 extends along an axis 35. The axis 35 can, for example, be aligned parallel to a z-axis. The melting furnace vessel 30 has an upper vessel 40 and preferably a lower vessel 45. The lower vessel 45 is arranged below the upper vessel 40 in the z-direction. The upper vessel 40 is placed on the lower vessel 45. The upper vessel 40 is designed as a hollow body and extends essentially in the circumferential direction around the axis 35. The lower vessel 45 can, for example, be trough-shaped. The melting furnace vessel 30 has a furnace wall 50 extending over the upper vessel 40 and over the lower vessel 45. The furnace wall 50 encloses an interior space 60 of the melting furnace vessel 30 on an inner side 55.

[0031] In the embodiment, a lining 65 is arranged, for example, on the inner side 55. In the embodiment, the lining 65 is arranged, for example, in the region of the lower vessel 45, although, for example, in FIG. 1, the lining 65 on the inner side 55 is omitted in the region of the upper vessel 40. Of course, it is also conceivable that the lining 65 is also arranged, at least in sections, on the inner side 55 of the upper vessel 40.

[0032] The upper vessel 40 has a lower opening 61 arranged on the underside of the upper vessel 40. At the lower opening 61, the upper vessel 40 is arranged on the lower vessel 45, and at the lower opening 61, the interior 60 of the upper vessel 40 opens into the interior 60 of the lower vessel 45. The lower opening 61 is arranged on the axis 35.

[0033] The suction device 15 has a suction pipe 70 and at least one conveying device 75, and preferably a filter device 80. The conveying device 75 can, for example, have an electrically operated fan. The conveying device 75 is designed to convey exhaust air 85. For example, the filter device 80 can be arranged upstream of the conveying device 75 or upstream of the conveying device 75. The suction pipe 70 is arranged upstream of the filter device 80 and further upstream of the conveying device 75.

[0034] The suction pipe 70 has, for example, a first pipe section 90, a pipe joint 95, and at least one second pipe section 100. The first pipe section 90 and the second pipe section 100 are connected to one another by means of the pipe joint 95. The first pipe section 90 can be pivoted relative to the second pipe section 100 by means of the pipe joint 95 between a first position (shown in FIG. 1 with a dashed line) and a second position (shown in FIG. 1 with a solid line) about a pivot axis 105. The pivot axis 105 extends, for example, parallel to the axis 35 and preferably also parallel to the z-axis. The axis 35 is arranged offset from the pivot axis 105. The second pipe section 100 ends on a side facing away from the pipe joint 95 at a central pipe 96, which fluidically connects the second pipe section 100 to the filter device 80.

[0035] The first pipe section 90 has a pipe opening 110 on a side opposite the pipe joint 95. Additionally, a grid 165 can be arranged at the pipe opening 110. The grid 165 can be mesh-shaped, with a mesh width of the grid 165 preferably being between 2 cm and 15 cm inclusive.

[0036] In the embodiment, at least the first pipe section 90 is formed, for example, with a rectangular profile. The first pipe section 90 can have a substantially L-shaped configuration (in a plan view along the z-axis). The first pipe section 90 and / or the second pipe section 100 can be formed, for example, from a sheet metal material. In addition, an escape door 115 can be arranged in the first pipe section 90, for example, which connects a pipe interior 120 with an area surrounding the first pipe section 90. The escape door 115 is closed during normal operation of the inspection system 10. A second escape route for the people working in the interior 60 can be provided via the pipe opening 110 and the escape door 115. The grille 165 is arranged on the pipe opening 110 in a reversibly detachable manner.

[0037] Additionally, a particle separator 116, in particular a coarse particle separator, can preferably be arranged in the first pipe section 90, but also in the second pipe section 100. The particle separator 116 can be designed, for example, as a cyclone separator or as a settling chamber.

[0038] The melting furnace vessel 30 with the lower vessel 45 is placed on the underside of the transport frame 20. The transport frame 20 can be arranged, for example, on a rail 125 so that the transport frame 20 is displaceable. For example, the transport frame 20 can be moved along the rail 125 in the y-direction. In FIG. 1, the transport frame 20 is shown in the inspection position. A web 129 can also be arranged laterally around the transport frame 20 to ensure accessibility to the transport frame 20. Furthermore, a climbing aid 175 is arranged on the transport frame 20. The climbing aid 175 can be designed, for example, as a staircase, in particular an inspection staircase, or a ladder.

[0039] FIG 2 shows a sectional view along a sectional plane AA shown in FIG 1 through the revision system 10 shown in FIG 1.

[0040] In FIG 2, parts of the inspection system 10 are omitted in the embodiment for the sake of simplicity.

[0041] The lower vessel 45 has a furnace bottom 130. The furnace bottom 130 can be substantially tub-shaped or bowl-shaped. The axis 35 can be substantially inclined, preferably perpendicular, to large portions of the furnace bottom 130.

[0042] In the embodiment, the lining 65 is preferably arranged exclusively on the lower vessel 45, while the inner side 55 of the upper vessel 40 is essentially free of the lining 65. Of course, it is also possible for the inner side 55 of the upper vessel 40 to be covered, at least in sections, with a lining 65.

[0043] The melting furnace vessel 30 has a first opening 135, a second opening 140 and preferably a third opening 145.

[0044] The second opening 140 is arranged axially with respect to the axis 35, opposite the furnace bottom 130. The second opening 140 is arranged on the upper side of the upper vessel 40 in FIG. 2 and is thus also arranged axially with respect to the axis 35, opposite the lower opening 61. During operation of the melting furnace vessel 30, a cover (not shown) with electrodes is placed on the second opening 140, for example.

[0045] The third opening 145 can be arranged, for example, in the furnace floor 130. The melt, for example, the metallic melt, molten in the melting furnace vessel 30 can be drained through the third opening 145. The third opening 145 can be arranged, for example, offset in the radial direction from the axis 35. Preferably, the third opening 145 is arranged at a lowest point of the furnace floor 130. The third opening 145 can also be referred to as a drain opening or pouring opening.

[0046] In this embodiment, the first opening 135 is designed, for example, as a so-called slag opening. The slag opening serves to remove liquid slag that forms in the interior space 60 during melting of the melt. For example, during operation of the melting furnace vessel 30, the slag can float on the melt, for example, the metallic melt, in particular a steel melt, and be poured off through the first opening 135.

[0047] In this embodiment, the first opening 135 is arranged, for example, in the furnace wall 50 of the upper vessel 40 axially between the second opening 140 and the lower opening 61 of the upper vessel 40. The first opening 135 preferably has a smaller cross-section than the second opening 140 and preferably has a larger cross-section than the third opening 145. The lower opening 61 can adjoin the first opening 135 on the underside. The lower opening 61 and the first opening 135 can be formed directly adjacent to one another in the axial direction.

[0048] In order to close the interior 60 of the melting furnace vessel 30 in the circumferential direction, a furnace door 150 is arranged at the first opening 135. When the furnace door 150 is closed, the interior 60 is sealed fluid-tight at the first opening 135. When the furnace door 150 is open, the interior 60 is accessible via the first opening 135. The furnace door 150 prevents the melting material and / or slag from escaping from the interior 60 during melting operation of the melting furnace vessel. In order for the furnace door 150 to thermally withstand the high loads of the melting material during melting operation, the lining 65 can extend at least partially over the inside of the furnace door 150 and / or the furnace door 150 can be thermally insulated in another way.

[0049] FIG 3 shows a further perspective view of the inspection system 10 shown in FIGS 1 and 2.

[0050] In FIG. 3, the first opening 135 is open, and the furnace door 150 is pivoted downward, for example. Furthermore, the first pipe section 90 is pivoted into the first position and is arranged with the pipe mouth 110 at the first opening 135.

[0051] FIG 4 shows a plan view of the inspection system 10 shown in FIGS 1 to 3.

[0052] The first pipe section 90 is, for example, L-shaped. In FIG. 4, the first pipe section 90 is shown with a solid line in the first position and with a dashed line in the second position. In the first position, the pipe mouth 110 is arranged at a short distance or directly at the first opening 135. In addition, a sealing device 155 can be arranged at the pipe mouth 110 in order to seal or at least reduce a gap 160 between the first opening 135 and the pipe mouth 110. This is particularly advantageous because slag residues can be present at the first opening 135 due to the regular pouring of slag, which form an irregular contour at the first opening 135.

[0053] The sealing device 155 can be designed, for example, as a labyrinth seal and / or with bristles in order to reduce the gap 160.

[0054] In the second position, the first tube section 90 is pivoted away from the first opening 135 about the pivot axis 105. In the second position, the tube mouth 110 is at a greater distance from the first opening 135 than in the first position.

[0055] FIG 5 shows a perspective view of a section of the suction device 15 shown in FIGS 1 to 4.

[0056] In order to support the first pipe section 90 even with a large projection and thus a large distance between the pipe opening 110 and the pivot axis 105, and to be able to form the first pipe section 90 with thin walls, for example from sheet metal, the suction device 15 has a support frame 176. The support frame 176 has a support arm 180 and a post 185. The post 185 can be formed, for example, from a hollow profile. In this case, the post 185 extends, for example, along the pivot axis 105. On the underside, the post 185 can be mounted on the foundation 192 on a pivot joint 191 so that it can rotate about the pivot axis 105. The support arm 180 is supported on the post 185 and is arranged, for example, on the underside of the first pipe section 90. The support arm 180 supports the first pipe section 90 in the z-direction.The support arm 180 can have one or more stiffeners 195 that support the support arm 180 on the post 185 to prevent deflection of the support arm 180.

[0057] FIG 6 shows a flowchart of a method for operating the revision system 10 shown in FIGS. 1 to 4.

[0058] In a first method step 305, if not done previously, the first pipe section 90 is pivoted from the first position into the second position.

[0059] In a second method step 310, the melting furnace vessel 30 of the arc furnace is removed from its operating position, for example by a crane, and positioned, for example, on the transport frame 20. Using the transport frame 20, the melting furnace vessel 30 is moved into an inspection position in the inspection system 10.

[0060] In a third method step 315 following the second method step 310, the first pipe section 90 is pivoted from the second position into the first position about the pivot axis 105, so that the pipe mouth 110 is arranged near or at the first opening 135.

[0061] In a fourth method step 320 following the third method step 315, the demolition machine 25 (clearly visible in FIG. 2) is lifted into the interior 60 of the melting furnace vessel 30 and placed on the furnace floor 130. This can be done, for example, by means of a gantry crane.

[0062] Furthermore, the climbing aid 175 is placed on the transport frame 20 (see FIG. 1) to allow access for persons via the second opening 140 to the furnace floor 130. Furthermore, the climbing aid 175 also represents an escape route for persons working in the interior 60 of the melting furnace vessel 30. In a fifth method step 325 following the fourth method step 320, the conveyor device 75 is activated.

[0063] After activation of the conveyor device 75 in the fifth method step 325, the lining 65 in the melting furnace vessel 30 is demolished using the demolition machine 25 in a sixth method step 330 (cf. FIG. 2) following the fifth method step 325. The dust-containing particles created in this process are sucked in together with the air in the melting furnace vessel 30 through the first opening 135 as dust-containing exhaust air 85. A flow during the sixth method step 330 is symbolically represented in FIG. 2 by arrows. By sucking out the exhaust air 85, a negative pressure is created in the interior 60 compared to the environment of the melting furnace vessel 30, so that fresh air 190 from the environment flows into the interior 60 through the second opening 140 and replaces the dust-containing exhaust air 85. A large proportion (for example, greater than 10 to 30 mass percent of all particles) of coarse particles (preferably with a size of 500 to 20.000 pm) in the dust-laden exhaust air 85 with from the interior 60.

[0064] In order to extract large quantities of dust-laden air, the conveyor device 75 has a corresponding conveying capacity. To prevent larger material, such as foil or paper, from entering the first pipe section 90, the grid 165 is provided, for example, at the pipe opening 110. Flat objects, such as foil, remain trapped on the grid 165 and prevent clogging of the pipe interior 120 and the conveyor device 75.

[0065] The sealing device 155 effectively prevents the unwanted intake of fresh air 190, for example from the surroundings of the inspection system 10, at the pipe opening 110. After entering the pipe interior 120 of the first pipe section 90, the exhaust air 85 flows along the first pipe section 90 and is guided through the first pipe section 90 to the pipe joint 95. Particles can be separated in the particle separator 116, particularly in the coarse particle separator. The partially purified exhaust air 85 flows after the particle separator 116 in the first pipe section 90 toward the pipe joint 95. The particle separator 116 prevents clogging and unnecessary contamination of the extraction device 15, particularly as the flow velocity of the exhaust air 85 decreases, in the extraction device 15.

[0066] At the pipe joint 95, the exhaust air 85 enters the second pipe section 100 and is conveyed via the central pipe 96 to the filter device 80. The dust-containing particles of the exhaust air 85 are separated in the filter device 80. The exhaust air 85 is then guided to the conveyor device 75 and, for example, blown out after flowing through the conveyor device 75.

[0067] After completion of the demolition work on the lining 65, a new lining 65 is built into the melting furnace vessel 30 in a seventh process step 335 following the sixth step 330.

[0068] In an eighth method step 340 following the seventh method step 335, the conveyor device 75 is deactivated. Furthermore, in the eighth method step 340, the first pipe section 90 is pivoted from the first position to the second position. Furthermore, after completion of the work, the furnace door 150 is closed, so that the melting furnace vessel 30 is ready for use again.

[0069] In a ninth method step 345 following the eighth method step 340, the transport frame 20 is moved from the inspection position, for example, and the melting furnace vessel 30 is transported back to the arc furnace, for example, to melt metal, in particular steel, glass, and / or the melting furnace vessel, using the electrodes arranged on the lid. The renewed lining 65 protects the lower vessel 45 and, if arranged on the upper vessel 40, from the metallic melt.

[0070] The above-described design of the inspection system 10 and the method for operating the inspection system 10 ensures efficient extraction of the resulting dust particle-air mixture, and the dust particle-laden air is efficiently discharged as exhaust air 85 through the first opening 135. In particular, the first opening 135 can be designed as a slag opening, and thus the furnace door 150 can be designed as a slag door.

[0071] The upper vessel 40 supports the guidance of the fresh air 190 supplied from the environment and entering via the second opening 140. The fresh air 190 mixes particularly well with the exhaust air 85 located in the interior 60 of the lower vessel 45, so that the exposure of the people working in the interior 60 to the dust-laden exhaust air 85 can be kept to a minimum. Since the fresh air 190 is sucked in from the environment, it is usually cooler than the exhaust air 85 located in the lower vessel 45 and thus cools the exhaust air 85 located in the lower vessel 45. By supplying the fresh air 190 directly into the lower vessel, a more pleasant and cooler working environment is created for the people working in the lower vessel 45. The supply of the fresh air 190 via the second opening 140 has the advantage that a large opening cross-section is available at the second opening 140.This allows a particularly large amount of fresh air 190 to be supplied via the second opening 140. Furthermore, the fresh air 190 flows in at a low flow velocity, so that no unpleasant draft is created for the people working in the interior space 60.

[0072] Furthermore, the distance of the particles of the exhaust air 85 until they are guided out of the interior 60 is particularly short when the exhaust air 85 is discharged via the second opening 140. This can prevent unwanted precipitation of the particles, for example, onto the furnace floor 130.

[0073] Furthermore, extraction of the exhaust air 85 on the upper side via the second opening 140 can be dispensed with, so that the second opening 140 is accessible during the demolition work and material can be transported into the interior 60 via the second opening 140, in particular can be lowered via the crane.

[0074] Furthermore, additional components of the extraction system 15, in particular exhaust hoods in which the entire melting furnace vessel 30 is to be positioned, can be dispensed with. This allows the extraction system 15 and, consequently, the inspection system 10 to be designed particularly simply.

[0075] Furthermore, thanks to the efficient extraction provided by the above-described inspection system 10, the conveying device 75 can be smaller in size to achieve the same extraction quality as in the prior art. Furthermore, the extraction device 15 is thus designed in a simpler manner.

[0076] List of reference symbols

[0077] 10 Revision system

[0078] 15 Extraction device

[0079] 20 transport frame

[0080] 25 demolition machines

[0081] 30 melting furnace vessel

[0082] 35 Axis

[0083] 40 Upper vessel

[0084] 45 Lower vessel

[0085] 50 furnace wall

[0086] 55 Inside

[0087] 60 interior

[0088] 61 Lower opening

[0089] 65 brick lining

[0090] 70 suction pipe

[0091] 75 conveyor system

[0092] 80 filter device

[0093] 85 exhaust air

[0094] 90 first pipe section

[0095] 95 Pipe joint

[0096] 96 central tube

[0097] 100 second pipe section

[0098] 105 Swivel axis

[0099] 110 muzzle

[0100] 115 Escape door

[0101] 120 pipe interior

[0102] 125 rail

[0103] 129 jetty

[0104] 130 oven floor

[0105] 135 first opening

[0106] 140 second opening

[0107] 145 third opening

[0108] 150 oven door

[0109] 155 Sealing device

[0110] 160 gap

[0111] 165 grids

[0112] 175 climbing aid 176 support frame

[0113] 180 support arm

[0114] 185 posts

[0115] 190 Fresh air 191 Swivel joint

[0116] 192 Foundation

[0117] 195 stiffening

[0118] 305 first process step 310 second process step

[0119] 315 third procedural step

[0120] 320 fourth procedural step

[0121] 325 fifth procedural step

[0122] 330 sixth process step 335 seventh process step

[0123] 340 eighth process step

[0124] 345 ninth procedural step

Claims

Patent claims 1. Revision system (10) for renewing a lining (65) of a melting furnace vessel (30), preferably of an arc furnace, - wherein the inspection system (10) comprises at least one suction device (15), a demolition machine (25) and a melting furnace vessel (30), - wherein the melting furnace vessel (30) extends along an axis (35) and has a lining (65), a furnace floor (130), an interior space (60) and a furnace wall (50) which adjoins the furnace floor (130) and circumferentially delimits the interior space (60), - wherein the demolition machine (25) is arranged in the interior (60), - wherein the melting furnace vessel (30) has in the furnace wall (50) a first opening (135) with a furnace door (150) and a second opening (140) arranged axially with respect to the axis (35) opposite the furnace floor (130), - wherein the lining (65) covers an inner side (55) of the melting furnace vessel (30), and preferably of the furnace door (150), at least in sections, - wherein the oven door (150) closes the first opening (135) when closed, and the interior (60) is accessible through the first opening (135) when opened, - wherein the suction device (15) has at least one suction pipe (70) and a conveying device (75), - wherein a pipe mouth (110) of the suction pipe (70) is arranged at the first opening (135), - wherein the conveying device (75) is designed to suck a dust-laden exhaust air (85) from the interior (60) via the first opening (135) and the pipe mouth (110) into the suction pipe (70), and to supply fresh air (190) via the second opening (140) into the interior (60).

2. Revision system (10) according to claim 1, - wherein the suction pipe (70) has a first pipe section (90), a pipe joint (95) and a second pipe section (100), - wherein the pipe joint (95) connects the first pipe section (90) to the second pipe section (100) in such a way that the first pipe section (90) can be pivoted relative to the second pipe section (100) between a first position and a second position, - wherein the pipe mouth (110) is arranged opposite the pipe joint (95), - wherein in the first position the pipe mouth (110) is arranged at the first opening (135), - wherein in the second position the pipe mouth (110) is arranged at a greater distance from the first opening (135) than in the first position.

3. Revision system (10) according to claim 1 or 2, - wherein the melting furnace vessel (30) has an upper vessel (40) and a lower vessel (45), - wherein the lower vessel (45) is trough-shaped, - wherein the upper vessel (40) is hollow and extends along the axis (35), - wherein the upper vessel (40) has the second opening (140) and a lower opening (61), - wherein the upper vessel (40) is arranged on the lower vessel (45) at the lower opening (61), - wherein the first opening (135) is arranged axially between the second opening (140) and the sub-opening (61).

4. Revision system (10) according to one of the preceding claims, - wherein the first opening (135) is designed as a slag opening for removing a liquid slag that can be arranged in the interior space (60).

5. Revision system (10) according to one of the preceding claims, - comprising a sealing device (155), - wherein the sealing device (155) is arranged at the pipe mouth (110) of the suction pipe (70), - wherein the sealing device (155) is designed to at least partially close a gap (160) between the pipe mouth (110) of the suction pipe (70) and the first opening (135).

6. Revision system (10) according to one of the preceding claims, - wherein the suction pipe (70) has a reversibly lockable escape door (115), - wherein the escape door (115) is arranged adjacent to the pipe mouth (110), - wherein the escape door (115) is closed when the conveyor device (75) is activated.

7. Revision system (10) according to one of the preceding claims, - wherein the suction device (15) has a grid (165), - wherein the grid (165) is arranged at the pipe mouth (110) or in the suction pipe (70), - wherein the grid (165) preferably has a mesh size of 2 cm to 15 cm inclusive.

8. Revision system (10) according to one of the preceding claims, - wherein the furnace door (15) is closed during melting operation of the melting furnace vessel (30) and is designed to prevent a liquid material, in particular melting material and / or slag, from escaping from the interior (60) of the melting furnace vessel (30).

9. Method for operating a revision system (10) according to one of the preceding claims, - wherein the suction pipe (70) with the pipe mouth (110) is positioned at the first opening (135) - whereby the brick lining (65) is broken off with the brick lining machine (25), - wherein upon removal of the lining (65), the conveying device (75) is activated and the conveying device (75) extracts dust-laden exhaust air (85) from the interior (60) of the melting furnace vessel (30) via the first opening (135) and the extraction pipe (70), - wherein fresh air (190) is fed into the interior (60) via the second opening (140).

10. Method according to claim 9 for operating a revision system (10) according to claim 2, - wherein the melting furnace vessel (30) is transported to an inspection station, - the oven door (150) is opened, - wherein the first tube section (90) is pivoted from the second position to the first position, and the tube mouth (110) is positioned at the first opening (135), - wherein after completion of the lining demolition, the first pipe section (90) is pivoted into the second position.

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