Charging shaft system having improved reliability

Abstract

The invention relates to a charging shaft system comprising a shaft-shaped container which has: an actuatable closure device that closes a feed opening; a discharge opening; and at least one suction opening that is assigned to a pre-heating region of the shaft-shaped container, wherein a shaft slide device having at least one movable shaft slide within the shaft-shaped container separates a pre-charging compartment from the pre-heating region. At least one additional suction opening is assigned to the pre-charging compartment. The pre-charging compartment is delimited by means of an impact wall which is inclined at an angle of between 30 degrees and 45 degrees, inclusive, relative to a horizontal plane, wherein each vector oriented in the direction of inclination of the impact wall lies on a straight line that passes through the travel path of at least one shaft slide within the shaft-shaped container. A vertical projection of the feed opening onto the impact wall lies at least 75% on the impact wall. The present invention thus provides a low-emission charging shaft system having a low failure rate and thus improved reliability.

Description

[0001] i-Ofil PCT / DE2025 / 000054 Y3221=WO KR Tec AG 17.05.25 CH-9230 Flawil Charging Shaft System with Increased Reliability Description The invention relates to a charging shaft system with a shaft-shaped container, which has an actuable closing device for a feed opening, a discharge opening, and at least one extraction opening associated with a preheating area of ​​the shaft-shaped container, wherein a shaft slide device with at least one movable shaft slide within the shaft-shaped container separates a pre-charging compartment from the preheating area. A charging shaft system is known from DE 10 2010 045 825 A1, in which the feed material is conveyed from the pre-charging compartment to the preheating area by means of a push basket.German patent DE 10 2017 124 108 A1 proposes storing the preheated feed material in a channel inclined at an angle of 5 to 15 degrees to the horizontal, from which the preheated feed material is to slide or be conveyed into the furnace vessel. The present invention addresses the problem of developing a low-emission charging shaft system with a low failure rate and thus increased reliability. This problem is solved by the features of the main claim. For this purpose, at least one further extraction opening is assigned to the pre-charging compartment. The pre-charging compartment is bounded by an impact wall that has an inclination of between 30 and 45 degrees, including the two end values, to a horizontal plane, wherein each vector oriented in the direction of inclination of the impact wall lies in a straight line that intersects the travel path of at least one shaft slide within the shaft-shaped container.A vertical projection of the feed opening onto the impact wall lies at least 75% on the impact wall. The loading of the charging shaft system with the feed material takes place – with the gate valve open – through the feed opening into the pre-loading compartment. The shaft gate valve, which separates the pre-loading compartment from the preheating area, is initially closed. The feed material, e.g., 100 tons of scrap steel, falls largely onto the impact wall. This impact wall is inclined, so that the scrap (27-05-2025-42287601-HauPt Pos f0013 PCT / DE2025 / 000054 Y3221=WO) accumulates on the impact wall and on the shaft gate valve. During loading, the dynamic momentum of the falling scrap is primarily absorbed by the impact wall. The shaft gate valve is subjected to a largely static load from the mass of the scrap. This reduces the risk of damage to the valve.The charging shaft system has at least one extraction opening in the preheating area and at least one extraction opening in the pre-charging compartment. The extraction opening in the preheating area extracts the exhaust gases used to preheat the charge material, e.g., from an electric arc furnace. These exhaust gases from the electric arc furnace are generated during the melting process of the charge material and are drawn in through the discharge opening. The extraction opening in the pre-charging compartment primarily extracts cold dust released during the unloading of the scrap basket. In the event of a failure of the shaft slide valve and / or the extraction system in the preheating area, the extraction system in the pre-charging compartment can be used in addition to extracting the exhaust gases from the melting and preheating processes. Further details of the invention will become apparent from the dependent claims and the following description of schematically illustrated embodiments.Figure 1: Charging shaft system with furnace vessel; Figure 2: Section of the charging shaft system; Figure 3: Baffle plate; Figure 4: Detail of the fastening of the wear plates; Figure 5: Variant of a charging shaft system with two S. chacht Schiebern;Figure 6: Scrap pushing device. The figure shows a charging shaft system (20) and a furnace vessel (11) as parts of an electric arc furnace system (10). To operate the electric arc furnace system (10), feed material, e.g., steel scrap, is conveyed intermittently or continuously from a scrap yard into the charging shaft system (20) by means of a conveying device. The density of the feed material is less than one-tenth the density of the liquid steel, e.g., 7850 kilograms per cubic meter. For example, for a tapping mass of 100 tons of liquid steel, the use of more than 200 cubic meters of scrap is required. The charging shaft system (20) has a discharge opening (21) through which the feed material is conveyed from the charging shaft system (20) into the furnace vessel (11), see Figure 2. In the furnace vessel (11), the feed material is heated, e.g., by means of electrical and / or fossil energy, to a temperature above the melting point, e.g.The furnace is heated to 1680 degrees Celsius. As soon as the molten bath is homogeneous, the liquid end product, e.g., liquid steel, is poured through a tapping opening of the furnace vessel (11) into a ladle positioned below the furnace vessel. During the melting process, the furnace vessel (11) is tilted against a tapping direction for slag removal. In this process, the furnace vessel (11) rolls, for example, along roller tracks. After the melting process is complete, the furnace vessel (11) is rolled along the roller tracks in the tapping direction for tapping and emptying, tilting up to 16 degrees to a horizontal position. 27-05-2025-42287801-HauP tPos t-0015 PCT / DE2025 / 000054 Y3221=WO The charging shaft system (20) is positioned during the melting process. B. by means of a sliding sleeve (not shown here) at a filling opening of the furnace vessel (11). It is conceivable to design the transition between the charging shaft system (20) and the furnace vessel (11) without a sliding sleeve.For maintenance purposes, the charging shaft system (20) has a drive mechanism (not shown) that allows it to be moved, for example, along rails located on the hall floor. These rails are oriented, for example, perpendicular to the tapping direction of the furnace vessel (11). The charging shaft system (20) can be moved along these rails a distance of, for example, two meters to remove the furnace vessel (11) or to insert a new one. The charging shaft system (20), see Figures 2 and 2, has a support frame (22) which, together with a support structure (23), supports a shaft-shaped container (31). The shaft-shaped container (31) has a feed opening (27) of the charging shaft system (20) at its upper rear end. At its front lower end, the discharge opening (21), oriented towards the furnace vessel (11), is located. For example, all wall parts (33 - 36) of the shaft-shaped container (31) can be designed to be water-cooled.In the exemplary embodiment, the water distribution is carried out via the support structure (23). For example, the cooling circuits of the individual wall sections (33-36) can be hydraulically connected in parallel. It is also conceivable to provide two or more cooling circuits for one wall section (33, 34, 35, 36). The entire water cooling system of the shaft-shaped container (31) can be designed as an open or closed circuit. For example, this water cooling is hydraulically independent of the water cooling of the furnace vessel (11) and of the water cooling of the electrical system, e.g., the high-voltage system, the transformer, the electrode support arms, etc. The shaft-shaped container (31) has, for example, a cuboid-shaped outer contour. In the exemplary embodiment, the internal height is 10.5 meters and the width is approximately 50 of this height. This width is limited by two vertically oriented wall sections, the side walls (34, 35).The length of the shaft-shaped container (31), oriented perpendicular to the aforementioned directions (25) of the charging shaft system, is 47 times the height of the shaft-shaped container (31) in the lower region. In the upper region, this length is, for example, 84 times the height of the shaft-shaped container (31). The wall section (33) facing the furnace vessel (11) is hereinafter referred to as the front wall (33). It is vertically formed. The wall section (36) furthest from the furnace vessel is the rear wall (36). The rear wall (36) is designed as a vertical wall section (37) in the lower region. Its height is, for example, 66 times the internal height of the shaft-shaped container (31). The upper region of the rear wall (36) is designed as an inclined impact wall (41). Its angle to the horizontal is between 30 degrees and 45 degrees, including both end values. In the exemplary embodiment, this angle is 43 degrees.The impact wall (41) is designed such that the shaft-shaped container (31) widens towards the top. The distance from the lower edge (42) of the impact wall (41) to the front wall (33) is less than the distance from the upper edge (43) to the front wall (33). In this embodiment, the impact wall (41) is reinforced compared to the other wall sections (33-35, 37) of the shaft-shaped container (31). In this embodiment, it has twice the thickness. It has, for example, a water-cooled support frame (44) located at the bottom. This frame is integrated into the water cooling system of the shaft-shaped container (31). A baffle plate (45) sits on the support frame (44), which has a support frame (46) with wear plates (47) and end plates (48). In this embodiment, the impact wall (41) is flat. It can also be, for example, curved in one direction.The axis of curvature then lies, for example, parallel to a vertical central longitudinal plane of the charging shaft system (20). The figure shows the wear plates (47) and end plates (48) of the impact plate (45). The multiple wear plates (47) are oriented parallel to the vertical central longitudinal plane of the shaft-shaped container (31). The vertical central longitudinal plane of the shaft-shaped container (31) is defined by a vector oriented vertically and by a vector oriented in the longitudinal direction (25) of the charging shaft system. Transverse end plates (48) are provided at the lower and upper ends of the impact plate (45). Optionally, the impact plate (45) can be designed without the end plates (48). The material of the wear plates (47) and the end plates (48) is, in the exemplary embodiment, S 355 J2 G3 with the material number 1.0570.Another wear-resistant material for the wear plates (47) and the end plates (48) is also conceivable. In the exemplary embodiment, the wear plates (47) and the end plates (48) have a thickness of 30 millimeters. The figure shows, for example, the attachment of the wear plates (47) to the support frame (46). The support frame (46) consists of closed, welded profiles (51). The individual profile (51) has, for example, a rectangular cross-section, with the profile height being greater than the profile width. The profile (51) has insertion slots (52) on its upper side. Engagement hooks (53), which are welded into the wear plates (47), project into these insertion slots (52). The engagement hooks (53) are oriented, for example, such that their rear gripping noses (54) point downwards.If necessary, individual wear plates (47) and / or end plates (48) can be secured by means of fixing bolts and clamping wedges penetrating them. The wear plates (47) and the end plates (48) are replaceable individually or in groups. A shaft slide valve device (61) with a shaft slide valve (62) is arranged below the impact wall (41). This valve is movable between a first end position, in which it does not project into the interior (38) of the shaft-shaped container (31), and a second end position, in which it separates an upper pre-charging compartment (101) from a lower preheating area (102) in the interior (38). In the exemplary embodiment, the shaft slide valve (62) and a horizontal plane enclose an angle of degrees. This angle is, for example, between degrees and 20 degrees, including both end values. The angles of inclination of the impact wall (41) and the shaft valve (62) lie in the same plane.Thus, the valve (62) and the impact wall (41) within the shaft-shaped container (31) enclose an angle of 135 degrees to 170 degrees inclusive. The valve (62) is, for example, water-cooled. Its cross-sectional thickness is, for example, 350 millimeters. The water cooling connections are located, for example, on the rear side of the valve (62), in the area of ​​the rear wall (36). The cooling circuit is, for example, hydraulically connected in parallel to the cooling circuits of the walls of the shaft-shaped container (31). The valve (62) can have a lower, for example, water-cooled support section to which wear-resistant plates with high thermal conductivity are attached. The fastening elements are designed, for example, as described in connection with the impact wall (41). The longitudinal direction of the plates is, for example, oriented in the direction of travel of the valve (62).The sheet material is, for example, a steel with a nominal Brinell hardness of 400 HBW. In the exemplary embodiment, it is a fine-grained alloy steel with a carbon content of up to 0.32%, a silicon content of up to 0.7%, a manganese content of up to 1.6%, a phosphorus content of up to 0.025%, a chromium content of up to 2.5%, a nickel content of up to 1.5%, a molybdenum content of up to 0.6%, and a boron content of up to 0.004%. The values ​​mentioned refer, for example, to a melt analysis of the material used. The material can be through-hardened and tempered. Among other things, it is machinable and weldable. It is also conceivable to use a different high-strength steel, e.g., 18 MnCr 4-3 or 23 MnCr4-3 with the material number 1.8714. The shaft valve (62) is driven by means of two hydraulic cylinder-piston units (63). These are arranged on the two side walls (34, 35) of the shaft-shaped container (31).They are hydraulically synchronized. The two cylinder-piston units (63) can be water-cooled. In the closed position of the shaft slide (62), the piston rods (64) of the cylinder-piston units (63) are retracted. To open the shaft slide (62), the piston rods (64) are extended relative to the cylinders (65) of the cylinder-piston units (63). 27-05“2025“422g7601-Haue Pô -0020 PCT / DE2025 / 000054 Y3221=WO 10 The shaft slide (62) extends from the rear wall (36) of the charging shaft system (20) facing away from the furnace vessel (11). The shaft slide (62) can be guided in guide rails (66) by means of sliding shoes. These guide rails (66) continue inside the shaft-shaped container (31). In the exemplary embodiment, the stroke of the shaft valve (62) is approximately 5000 millimeters. This stroke is therefore greater than ten times the thickness of the shaft valve (62).The valve (62) can have bristles for sealing against the walls of the shaft-shaped container (31). The usable volume of the preheating section (102) is, for example, one and a half times the usable volume of the pre-charging compartment (101). The usable volume is defined as the portion of the internal volume of the shaft-shaped container (31) that is filled with feed material during operation of the charging shaft system (20). In the exemplary embodiment, the total internal volume of the pre-charging compartment (101), i.e., the usable volume and the unfilled areas of the pre-charging compartment (101), is 133 cubic meters. The internal volume of the preheating section (102) is 151 cubic meters in the exemplary embodiment. The roof (39) of the shaft-shaped container (31) is largely horizontal. It is, for example, water-cooled. It is closed in the area adjacent to the front wall (33).If necessary, the ceiling (39) can be covered on its upper surface with impact-resistant sheets. The length of this area, oriented in the longitudinal direction (25) of the charging shaft system, is 56 of the total length of the ceiling (39). The feed opening (27) is located in the area of ​​the ceiling (39) adjacent to the rear wall (36). The feed opening (27) has a rectangular cross-sectional area. It borders, for example, the side walls (34, 35) and the upper edge (43) of the impact wall (41). For example, the cross-sectional area of ​​the feed opening (27) is 30 of the area of ​​the ceiling (39). In the exemplary embodiment, a projection of the feed opening (27) oriented vertically, i.e., in the direction of gravity, lies completely on the impact wall (41). However, it is also conceivable that at least 75% of the projected area of ​​the feed opening (27) lies on the impact wall.The remaining part of the projected area then lies, for example, on the shaft slide (62). A closing device (71) is arranged on the ceiling (39). This closing device (71) has a closing slide (72) which is driven by means of two hydraulic cylinder-piston units (73). In the exemplary embodiment, the closing slide (72) is water-cooled. For example, its water circuit is hydraulically connected in parallel to the cooling circuits of the side walls (34, 35). The closing slide (72) has, for example, block-shaped guide shoes with which it slides along guide rails on both sides. The two cylinder-piston units (73) are attached to the ceiling (39) laterally to the side of the closing slide (72). The cylinder base (74) is, for example, arranged on the rear wall (36) so that the piston rods (75) point towards the front wall (33).These piston rods (75) are retracted when the locking slide (72) is closed. The two cylinder-piston units (73) are hydraulically synchronized. This ensures that the double-acting locking slide (72) does not jam during operation. The cylinders (76) of the cylinder-piston units (73) are water-cooled. In the illustrated embodiment, the locking slide (72) moves over the top (39) when opening. However, it is also conceivable to move the locking slide (72) in the opposite direction when opening, i.e., over the rear wall (36). The piston rods (75) of the two cylinder-piston units (73) then point in the direction away from the front wall (33). The charging shaft system (20) has at least two extraction openings (81, 91).In the exemplary embodiment, a first extraction opening (81) is arranged in a side wall (34; 35) of the pre-charging compartment (101). It is also conceivable to provide further extraction openings (81) associated with the pre-charging compartment (101) in the opposite side wall (35; 34) and / or in the ceiling (39) and / or on the front wall (33). A first extraction line (82) is connected to the extraction opening (81) or to the extraction openings (81) of the pre-charging compartment (101). It connects the extraction opening (81) to, for example, a filter system as part of an extraction post-treatment system. A control or regulating flap (83) is arranged in the extraction line (82). If there are several extraction openings (81) assigned to the pre-charging compartment (101), it is also conceivable to assign a control or regulating flap (83) to each of these extraction openings (81) for controlling the extraction volume flow.In the exemplary embodiment, a second extraction opening (91) is arranged in the rear wall (36) of the shaft-shaped container (31) in the preheating area (102). The distance to the shaft slide (62) corresponds, for example, to the height of the shaft-shaped container (31) below the shaft slide (62). The width of the extraction opening (91) associated with the preheating area (102) is, for example, 95 times the width of the shaft-shaped container (31). Its height is, for example, the height of the shaft-shaped container (31) below the shaft slide valve (62). The extraction opening (91) of the preheating area (102) can also be arranged in a side wall (34; 35) of the shaft-shaped container (31). It is also conceivable to provide extraction openings (91) on both side walls (34, 35). For example, an additional extraction opening (91) can be provided in the rear wall (36).An extraction duct (92) is connected to the extraction opening (91) or extraction openings (91) of the preheating area (102). This duct has, for example, an adjustable shut-off valve (93). This allows the flow of the extracted exhaust gas to be controlled or regulated. In a version with several extraction openings (91) assigned to the preheating area (102), these can also be individually controllable or adjustable. The cross-section of the two extraction openings (81, 91) can be identical. The cross-section of the extraction opening (81) of the pre-charging compartment (101) is at least 50 times the cross-section of the extraction opening (91) of the preheating area (102). In the exemplary embodiment, the extraction line (82) of the pre-charging compartment (101) and the extraction line (92) of the preheating area (102) terminate in a common main extraction line (94). This directs, for example, the exhaust gases via a compressor station to an exhaust gas aftertreatment station.For example, the exhaust gases are cleaned by means of a filter system and heated to a temperature above 750 degrees Celsius. It is also conceivable to route the extraction line (82) of the pre-charging compartment (101) and the extraction line (92) of the preheating area (102) separately, e.g., to the exhaust gas aftertreatment station. The exhaust gases can then be treated separately, if necessary. The figure shows a sectional view of a variant of the charging shaft system (20) with two shaft slide valves (62, 67). The section plane of this view lies transversely to the vertical central longitudinal plane, looking towards the rear wall (36). Each of the shaft slide valves (62; 67) is arranged on a side wall (34; 35) of the shaft-shaped container (31). The impact wall (41) is designed and arranged as described in connection with the first embodiment.When the shaft gates (62, 67) close, they move towards each other until they meet in a butt joint (68), for example, in a form-fitting manner. The butt joint (68) lies, for example, in the vertical central longitudinal plane. Its longitudinal direction, together with a straight line arranged in this vertical central longitudinal plane and oriented along the impact wall (41), forms the aforementioned angle between a single shaft gate (62) and the impact wall (41). The discharge opening (21) is located in the lower part of the charging shaft system (20). This discharge opening (21) is located below the front wall (33) at a discharge nozzle (24). The length of the, for example, water-cooled discharge nozzle (24) is, for example, 18 times the length of the shaft interior (38) oriented in the same direction. The sliding sleeve with a sealing plate is, for example, arranged at the discharge nozzle (24). The sealing plate points towards the oven vessel (11).During operation of the electric arc furnace system (10), the sliding sleeve rests against the furnace vessel (11), so that it closes the gap between the discharge nozzle (24) and the —H PCT / DE2025 / 000054 Y3221=WO. 15the furnace vessel (11). The sliding sleeve, including the sealing plate, is, for example, water-cooled. A scrap pusher device (110) is arranged on the side of the shaft-shaped container (31) facing away from the discharge opening (21). The figure shows such a scrap pusher device (110). This device has a scrap slide (111) that can be moved linearly by means of two hydraulically actuated cylinder-piston units (112). In a home position, the scrap slide (111) is completely outside the interior of the shaft (38). The gap to the support frame (23) is sealed, for example, by means of a bristle seal. From this home position, the scrap slide (111) can be extended relative to the support frame (23) until it projects through the discharge opening (21) into the furnace vessel (11).The stroke of the scrap slide (111) is, for example, greater than the length of the interior (38) of the shaft-shaped container (31) in the preheating area (102). The scrap slide (111) has, for example, a trapezoidal thrust body (113). This thrust body (113) has a trapezoidal cross-section oriented perpendicular to its stroke direction, which widens from bottom to top. The length of the thrust body (113) is, for example, seven meters. The top of the thrust body (113) carries, for example, a plurality of adjacent plates (114). These plates (114) are, for example, oriented in the stroke direction (115) of the scrap slide (111), see Figures 1 and 2. The plates (114) are, for example, made of the same material as the protective plates of the shaft slide (62). They can be attached in the same way as the wear plates (47) and the end plates (48) of the impact wall (41). In the exemplary embodiment, the end face of the pusher body (113) has, for example, aA cuboid-shaped recess adjoins the lower edge of the pusher body (113). A push block (116) is seated in this recess. The end face of the push block (116) is a maximum of 40 times the push surface of the scrap pusher (111). In the exemplary embodiment, the end face of the push block is 27 times the push surface of the scrap pusher (111). In the exemplary embodiment, the length of the push block (116) is 43 times the length of the pusher body (113). The push block (116) is movably mounted within the pusher body (113). For example, it can be moved relative to the pusher body (113) from a retracted position, in which the end face of the push block (116) lies in a common plane with the entire push surface, to an extended position. In the extended position, the push block (116) projects, for example, three-quarters of its length out of the push surface.In the exemplary embodiment, two hydraulically actuated cylinder-piston units (117) are used to drive the thrust block (116). These are controlled synchronously with each other. Both the cylinder-piston units of the thrust block (117) and the cylinder-piston units (112) for driving the thrust element (113) can be designed with water cooling. seinBefore loading the shaft-shaped container (31), the charging shaft system (20) is positioned in an operating position against the furnace vessel (11). The sliding sleeve, if present, is extended and rests against the furnace vessel (11). The scrap slide (111) is in its retracted position. The shaft slide (62) and the closing slide (72) are closed. The shaft slide device (61) separates the pre-charging compartment (101) from the preheating area (102). If necessary, the shaft slide (62) may be open when restarting the electric arc furnace system (10). The extraction system for the pre-charging compartment (101) and the extraction system for the preheating area (102) are switched on. The feed material is conveyed, for example, by means of several scrap baskets one after the other from a scrap yard to a loading position above the closing slide (71). Each scrap basket, for example, transports 100 tons of scrap metal. The locking slide (71) is opened.When the bottom trays of the scrap basket are opened, the scrap falls vertically downwards. It falls through the feed opening (27) and strikes the impact wall (41). Along the impact wall (41), it slides downwards onto the shaft slide (62). The shaft slide (62) thus receives only a small portion of the scrap's impact impulse. The scrap is distributed in the pre-charging compartment (101). The volume of the pre-charging compartment (101) is, for example, 1.2 times the nominal volume of the scrap basket, so that the entire volume conveyed by the scrap basket can be accommodated in the preheating compartment (101). The dust generated during charging is extracted through the extraction opening (81) associated with the pre-charging compartment (101). abgesaugtAfter the pre-loading compartment (101) is loaded, the closing slide (71) is closed. The extraction through both extraction openings (81, 91) remains switched on. With the closing slide (71) still closed, the chute slide (62) is opened. The scrap falls from the pre-loading compartment (101) into the preheating area (102). If necessary, the chute slide (62) can be closed again immediately afterwards. It then borders within the 27-05-2025~42287b01- HâuP PCS t"0028 PCT / DE2025 / 000054 Y3221=WO 18 The shaft-shaped container (31) separates the pre-charging compartment (101) from the preheating area (102). During operation of the electric arc furnace system (10), the exhaust gases are extracted through the shaft-shaped container (31) by means of the preheating area's (102) extraction system. In doing so, they flow through the scrap in the preheating area (102). The gas flow is essentially diagonal from the discharge opening (21) to the extraction opening (91) of the preheating area (102). This ensures that the scrap is heated uniformly. The extraction volume is, for example, between 150,000 and 200,000 standard cubic meters per StundeOnce a portion of the feed material in the furnace vessel (11) has been melted, new scrap can be conveyed from the shaft-shaped container (31) into the furnace vessel (11). For this purpose, the scrap pusher (110) is used. When the pusher body (113) extends, the lowest layer of preheated scrap is pushed through the discharge nozzle (24) into the furnace vessel (11). If the pusher body (113) becomes blocked, the pusher block (116) is extended relative to the pusher body (113). The pusher block (116) displaces some of the scrap immediately in front of the scrap slide (111). This reduces the resistance acting on the pusher body (113). The scrap can then be conveyed in a timed manner from the preheating area (101) into the furnace vessel (111). For example, with each stroke of the scrap pushing device (110), a similarly large quantity of scrap is pushed into the furnace vessel (11).The progress of the melting process can thus be controlled by the scrap pusher (110). 27"05-2025-42287601-HauP tPos t-0023 PCT / DE2025 / 000054 Y3221=WO 19 During melting and preheating, new feed material can be loaded into the pre-charging compartment (101) with the shaft slide (62; 67) closed. This is done as described above. As soon as the volume of feed material in the preheating area (102) has decreased sufficiently, the shaft slide (62) is opened again and the new feed material is loaded from the pre-charging compartment (101) into the preheating area (102). The fill level can be monitored by means of sensors arranged on the outside of the shaft-shaped container (31). Charging the charging shaft system (20) using the scrap baskets or a conveyor belt can also be timed. The time intervals of the Charging times may be longer than the time intervals for conveying using the scrap pusher device (110).All extraction systems are switched on at all times, preventing any exhaust fumes from escaping into the environment. The individual embodiments can also be combined.

[0002] 27-05-2025-4228780 "HâUP Pô -0030PCT / DE2025 / 000054 Y3221=WO 20 Reference List 10 Electric Arc Furnace System 11 Furnace Vessel 20 Charging Shaft System 21 Discharge Opening 22 Support Frame 23 Support Structure 24 Discharge Nozzle 25 Charging Shaft System - Longitudinal Direction 26 Transverse Direction 27 Addition Opening 31 Shaft-Shaped Container 33 Wall Section of (31), Front Wall 34 Wall Section of (31), Side Wall 35 Wall Section of (31), Side Wall 36 Wall Section of (31), Rear Wall 37 Wall Section, Vertical of (36) 38 Interior of (31) 39 Ceiling of (31) 41 Impact Wall 42 Lower Edge of (41) 43 Upper Edge of (41) 44 Support Frame 45 Impact floor 46 Support frame 47 Wear plates, oriented in the fall line 48 Wear plates, oriented in the transverse direction 52 Insertion slots 27-05-2025-4228780 - Main Pos “003PCT / DE2025 / 000054 Y3221 WO 21 53 Engagement hook 54 Rear grip lugs 61 Shaft slide device 62 Shaft slide 63 Cylinder-piston unit 64 Piston rod 65 Cylinder 66 Guide rails 67 Shaft slide 68 Butt joint 71 Locking device 72 Locking slide 73 Cylinder-piston units 74 Cylinder base 75 Piston rods 76 Cylinder 81 Suction opening, first suction opening 82 Suction line, first suction line 83 Control or regulating flap 91 Suction opening 92 Suction duct 93 Adjustable shut-off flap 94 Main exhaust line 101 Pre-charging compartment 102 Preheating area 110 Scrap pusher 111 Scrap slide 112 Cylinder-piston unit 27-05-2025-4228760 -HaaP tos t-0032PCT / DE2025 / 000054 Y3221=WO 22 113 Push body 114 Plates 115 Stroke direction 116 Push block 117 Cylinder-piston units

Claims

27-05-2025-42287801-HauPtPost-0G34 PCT / DE2025 / 000054 Y3221=WO 23KR Tec AG 17 .05.25CH-9230 Flawil Patent claims 1. Charging shaft system (20) with a shaft-shaped container (31) which has an actuable closing device (71) closing an addition opening (27), a dispensing opening (21) and at least one extraction opening (91) associated with a preheating area (102) of the shaft-shaped container (31), wherein a shaft slide device (61) with at least one movable shaft slide (62;67) within the shaft-shaped container (31) a pre-charging compartment (101) separates from the preheating area (102), characterized in that - the pre-charging compartment (101) is assigned at least one further extraction opening (81), - the pre-charging compartment (101) is bounded by means of an impact wall (41) which has an inclination between 30 degrees and 45 degrees including the two end values ​​to a horizontal plane, wherein each vector oriented in the inclination direction of the impact wall (41) lies in a straight line which defines the travel path of at least one shaft slide valve (62;67) penetrates within the shaft-shaped container (31), - such that a vertical projection of the addition opening (27) onto the impact wall (41) lies at least 75% on the impact wall (41).

2. Charging shaft system (20) according to claim 1, characterized in that the impact wall (41) has replaceable wear plates (47) on its side facing into the interior (38) of the shaft-shaped container (31). 57- nC-îfi5k- — wa e — T PCT / DE2025 / 000054 Y3221=WO 24 3. Charging shaft system (20) according to claim 1, characterized in that the vertical projection of the addition opening (27) onto the impact wall (41) lies completely on the impact wall (41).

4. Charging shaft system (20) according to claim 1, characterized in that the impact wall (41) and the dispensing opening (21) are arranged on opposite wall sections (33, 36) of the shaft-shaped container (31).

5. Charging shaft system (20) according to claim characterized in that the impact wall (41) forms an angle between 135 degrees and 170 degrees with a single shaft slide valve (62) or with the longitudinal direction of a butt joint (68) of two shaft slide valves (62, 67) within the shaft-shaped container (31). 6.Charging shaft system (20) according to claim 1, characterized in that, when using a single shaft slide valve (62), the impact wall (41) and the shaft slide valve (62) are inclined in the direction of the dispensing opening (21). Charging shaft system (20) according to claim 1, characterized in that all shaft slide valves (62, 67) and all wall parts (33-37) of the shaft-shaped container (31) are water-cooled. 57—HC- 433w7£n -U aq— - PCT / DE2025 / 000054 Y3221=WO 25 8. Charging shaft system (20) according to claim 1, characterized in that a scrap pusher device (110) with a retractable scrap pusher (111) is arranged on the wall part (36) of the shaft-shaped container (31) facing away from the discharge opening (21).

9. Charging shaft system (20) according to claim 8, characterized in that the retractable scrap pusher (111) has a push body (113) and a push block (116) that is movable together and relative to it, wherein the push area of ​​the push block (116) is a maximum of 40 of the total push area of ​​the scrap pusher (111).

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