A feeding system for a metallurgical furnace

Abstract

The present invention discloses a feeding system for a metallurgical furnace, which includes a fixed support frame, an electric ladle, an outer smoke hood, a hoisting device and a metallurgical furnace. The furnace opening of the metallurgical furnace is located inside the outer smoke hood and is correspondingly arranged with the electric ladle. The electric ladle includes a suspension bracket detachably installed on the fixed support frame, a ladle body rotatably installed on the suspension bracket, a tilting drive member for driving the ladle body to tilt, and a power supply assembly for supplying power to the tilting drive member. An entrance and exit for the electric ladle to enter and exit and a cover for controlling the opening and closing of the entrance and exit are provided on the outer smoke hood. Through the structural arrangement of the present invention, automatic feeding, slag discharging, discharging, etc. of the metallurgical furnace are realized in a fully enclosed environment, and flue gas is collected under airtight working conditions, effectively solving the problem of low-altitude pollution, improving the environmental protection of the metallurgical furnace production, increasing the operation rate of the metallurgical crane, and prolonging the service life of the metallurgical furnace.

Description

Technical Field

[0001] The present invention belongs to the technical field of pyrometallurgical equipment, and in particular relates to a feeding system for a metallurgical furnace. Background Art

[0002] Generally speaking, a metallurgical furnace refers to a process equipment that conducts pyrometallurgical treatment at high temperatures. A metallurgical furnace can be a melting furnace, a blowing furnace, a refining furnace, a top-blown converter, or various high-temperature heat treatment furnaces for batch treatment or continuous treatment. The common feature of these furnaces is that each furnace can perform one or more specific movements. For example, in the field of copper smelting, the commonly used matte blowing furnace PS converter and the rotary anode furnace for crude copper refining. In the field of steelmaking, the commonly used oxygen top-blown converter (or called oxygen inclined blowing converter), and these furnaces can all rotate around an axis to complete operations such as feeding, blowing air, slag discharging, and discharging materials.

[0003] These operations of the above-mentioned metallurgical furnaces usually generate a large amount of flue gas containing harmful components such as SO 2 etc., causing serious air pollution. Therefore, various types of environmental protection hoods are generally provided to collect this flue gas as much as possible. For example, for a PS converter, usually two layers of hoods are set for flue gas collection, including an inner hood (also called a primary hood or a water-cooled hood) and an outer hood (also called a secondary hood or a ring-type collecting hood). The inner hood is used for collecting flue gas during the normal blowing operation of the PS converter. At this time, the flue gas contains SO 2 with a high concentration and can be sent for acid production. The capture rate of the inner hood is very high and can reach more than 95%. The outer hood is mainly used for collecting the flue gas escaping during slag discharging and discharging materials of the PS converter. At this time, the flue gas contains SO 2 with a low concentration and is sent for ring-type collecting desulfurization treatment.

[0004] In recent years, most research has focused on how to improve the tightness and capture efficiency of these hoods. For example, Patent CN205035423U proposes a smoke collecting device for treating the escaping flue gas of a horizontal PS converter. According to this document, a smoke collecting system composed of a sliding hood and an external fixed hood is described, which is used to absorb the flue gas generated during the process of the converter mouth turning out or turning into the inner hood, copper discharging, and slag pouring operations; when the sliding hood is opened, the outer fixed hood is used to absorb the flue gas generated during the feeding and furnace mouth cleaning operations of the converter. Similarly, Patent CN201811452981.8 and Patent CN201921211847.9 respectively describe the sliding hood first proposed for the PS converter in Patent CN205035423U as a movable door and a walking movable hood, without essential differences.

[0005] Patent CN209338600U describes a front door of a top-blown converter for steelmaking, which includes two left and right doors arranged outside the fixed hood. The two left and right doors are respectively provided with drive motors and can slide left and right along the tracks. In principle, it is similar to the sliding hood described in the above-mentioned PS converter.

[0006] Patent CN203049011U describes a new type of PS converter system, which includes a PS converter, a floor hood, a ladle transportation channel, a ladle transportation electric flat car, and a remote control metallurgical crane. The floor hood and the ladle transportation channel are arranged in front of the PS converter. The ladle transportation electric flat car is arranged in the ladle transportation channel to realize the transportation of the ladle in the workshop. The remote control metallurgical crane is arranged in the floor hood to realize the molten metal transportation operation between the ladle and the converter. This configuration actually allows the flue gas to escape into the floor hood and then be collected through the annular collecting smoke outlet at the top of the floor hood. However, this relatively enclosed space has a large volume, causing serious pollution to the workshop, and this enclosed space hinders the converter front channel and does not meet the various maintenance operation conditions of the converter.

[0007] Patents CN201621423449.X and CN211057200U both propose a feeding device or configuration through a chute from the feeding port opened at one end or the periphery of the converter. Only for the converter alone, this device or configuration seems reasonable. However, due to the complexity of the converter system and specific operating conditions, each converter system is generally equipped with large-scale equipment such as waste heat boilers, anode scrap feeders, and converter dust collectors, and there are generally at least 3 or more converter systems. Therefore, the feeding method of using a chute for the PS converter cannot simply refer to the configuration of using a chute for feeding in the current rotary anode furnace. These problems are well-known to metallurgical technicians with PS converter operation experience. So far, there are no relevant actual application cases.

[0008] As is well-known, the core common problem existing in all the above-mentioned existing actually used metallurgical furnaces is that they cannot solve the problem of low-altitude pollution caused by the collection of flue gas during the feeding of the metallurgical furnace. Because when these metallurgical furnaces need to be fed from the furnace mouth, they all need to cooperate with the main and auxiliary hooks of the metallurgical crane (bridge crane) to tilt the ladle to complete the feeding action. The problem brought about by this is that in order to avoid the steel wire ropes of the main and auxiliary hooks of the metallurgical crane, the hoods set on these metallurgical furnaces must be open at the feeding furnace mouth during the feeding of the metallurgical furnace, and a relatively airtight space cannot be formed for the feeding operation, resulting in a large amount of flue gas escaping during the feeding operation and causing low-altitude pollution.

[0009] Therefore, the feeding methods of existing metallurgical furnaces need to be further broken through, and the environmental protection performance needs to be further improved. Summary of the Invention

[0010] In order to overcome the deficiencies of the prior art, the present invention provides a feeding system for a metallurgical furnace, which effectively solves the problem of flue gas collection during the feeding of the metallurgical furnace, reduces environmental pollution, and improves the environmental protection of the production operation of the metallurgical furnace.

[0011] To achieve the above object, the present invention adopts the following technical solutions: A feeding system for a metallurgical furnace includes a fixed support frame, an electric ladle disposed on the fixed support frame, an outer flue gas hood covering the upper part of the fixed support frame, a hoisting device for hoisting the electric ladle into the outer flue gas hood, and a metallurgical furnace at least partially located in the outer flue gas hood. The furnace mouth of the metallurgical furnace is located in the outer flue gas hood and is correspondingly arranged with the electric ladle. The electric ladle includes a hanger that can be detachably installed on the fixed support frame, a ladle body rotatably installed on the hanger, a tilting drive member for driving the ladle body to tilt, and a power supply assembly for supplying power to the tilting drive member; an entrance and exit for the electric ladle to enter and exit is opened on the outer flue gas hood, and a hood cover for controlling the opening and closing of the entrance and exit is provided.

[0012] Preferably, the power supply assembly is a remote power automatic plugging and unplugging device, which includes a female head installed on the hanger and a male head fixedly installed on one side of the female head. The female head is electrically connected to the tilting drive member. The male head includes a plug and a telescopic member for controlling the telescopic movement of the plug. The plug is electrically connected to an external power supply and is correspondingly inserted into the female head.

[0013] Preferably, the power supply assembly is a low-voltage power supply assembly, which includes a low-voltage power supply device for feeding power to the fixed support frame, a conductive device disposed on the hanger, and a step-up device installed on the hanger. The conductive device is electrically connected to the step-up device, and the step-up device is electrically connected to the tilting drive member.

[0014] Preferably, the hanger includes a cross beam and suspension rods installed on the cross beam. Protrusions are provided at both ends of the cross beam. A limiting groove for restricting the movement of the cross beam is opened at the top of the fixed support frame, and the protrusions can be correspondingly lapped in the limiting groove.

[0015] Preferably, the suspension rods are at least two articulated rods articulated in sequence from head to tail. The articulated rod at the top is fixedly connected to the cross beam. At least one of the adjacent articulated rods that are mutually articulated is provided with a limiting portion for restricting the rotation angle of the articulated rod.

[0016] Preferably, a lifting ring for hoisting is further provided on the cross beam. The lifting ring is one lifting ring located in the center of the cross beam or multiple lifting rings distributed on both sides of the cross beam.

[0017] Advantages of the present invention: Through the structural arrangement of the present invention, operations such as automatic feeding, slag discharging, and discharging of the metallurgical furnace are realized in a closed environment, and flue gas is collected under the condition of a full closed-loop working condition, effectively solving the problem of low-altitude pollution and improving the environmental protection of metallurgical furnace processing; at the same time, the operation rate of the metallurgical crane is greatly improved, and operational errors that may occur when manually controlling the feeding of the metallurgical crane are directly avoided, reducing the collision deformation of the furnace mouth and damage to the furnace bricks, effectively extending the service life of the metallurgical furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram of the present invention in a sectional state.

[0019] Figure 2 It is a side view structural schematic diagram of the present invention in a sectional state.

[0020] Figure 3 It is a structural schematic diagram of the electric ladle in the first hoisting state.

[0021] Figure 4 It is a structural schematic diagram of the electric ladle in the second hoisting state.

[0022] Figure 5 It is a structural schematic diagram of the electric ladle in the third hoisting state.

[0023] Figure 6 It is a schematic diagram of the electric ladle receiving material.

[0024] Reference numerals: 1, electric ladle; 2, metallurgical furnace; 3, fixed support frame; 31, limit groove; 4, outer layer smoke hood; 50, material; 10, hanging frame; 101, cross beam; 102, suspension rod; 103, articulated rod; 1031, limit part; 104, male head; 105, female head; 106, protruding part; 108, lifting ring; 20, tilting drive member; 30, ladle main body; 301, trunnion; 40, power supply assembly; 61, chute; 62, ladle box; 63, track; 64, electric flat car; 70, metallurgical crane. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] As Figures 1 - 6 shown, a feeding system for a metallurgical furnace 2 includes a fixed support frame 3, an electric ladle 1, an outer layer smoke hood 4, a hoisting device and the metallurgical furnace 2. The electric ladle 1 is hung on the fixed support frame 3, and the metallurgical furnace 2 is located on one side of the electric ladle 1; the outer layer smoke hood 4 covers the fixed support frame 3, the electric ladle 1 and the metallurgical furnace 2, the furnace mouth of the metallurgical furnace 2 is located in the outer layer smoke hood 4 and is correspondingly arranged with the electric ladle 1, and both ends of the furnace body of the metallurgical furnace 2 penetrate out of the outer layer smoke hood 4 respectively to save the space of the outer layer smoke hood 4.

[0026] Further, the outer smoke hood 4 is provided with an entrance and exit for the electric bun 1 to enter and exit, and a cover is installed at the entrance and exit to control the opening and closing of the entrance and exit.

[0027] Specifically, the fixed support frame 3 is a support column located on both sides of the electric bun 1. The electric bun 1 includes a hanging frame 10, a bun body 30, a tilting drive member 20, and a power supply assembly 40. The hanging frame 10 includes a cross beam 101 and a hanging rod 102. A protruding portion 106 is fixedly connected to each end of the cross beam 101. A limiting groove is provided on the support column, and the limiting groove is located at the top of the support column. When the electric bun is installed on the fixed support frame, the protruding portions are respectively lapped in the limiting grooves of the corresponding support columns; wherein, the protruding portion can be a round shaft or a square shaft, and the limiting groove can be an arc-shaped groove or a rectangular groove.

[0028] Further, the hanging rod 102 is composed of two articulated rods 103 hinged up and down. One end of the upper articulated rod 103 is fixedly connected to the bottom of the cross beam 101, and the other end is hinged to the lower articulated rod 103. A limiting portion 1031 is fixedly connected to one end of the lower articulated rod 103. When the two articulated rods 103 rotate relative to each other to a certain angle, the limiting platform will interfere with the upper articulated rod 103 to limit the extreme rotation angle between the articulated rods 103. The limiting portion 1031 can be a limiting platform fixedly connected to one side of the articulated rod 103; generally, the electronic bun needs to be fed in the bun box 62, and the bun box 62 generally has a height limit. Therefore, through the articulated connection of the articulated rods 103, the cross beam 101 can be folded into a horizontal state through movable hinges. On the one hand, the height of the electric bun 1 is reduced to ensure that it does not exceed the height during transportation. On the other hand, it avoids the high-temperature melt passing through the cross beam 101 when the chute 61 discharges materials.

[0029] Further, the bun body 30 is rotatably installed on the lower articulated rod 103 through a trunnion 301, and a material 50 is installed therein; the tilting drive member 20 is fixedly connected to the lower articulated rod 103, and it can be a three-phase or single-phase capacitor motor. The output shaft of the tilting drive member 20 is connected to one trunnion 301 on the side of the bun body 30; the power supply assembly 40 is electrically connected to the tilting drive member 20.

[0030] As Figures 3 - 5 shown, further, the hoisting device is a metallurgical hoist 70 with a single hook or a double hook.

[0031] Further, a lifting ring 108 is installed on the cross beam 101. The lifting ring 108 can be a single lifting ring 108 installed in the center of the cross beam 101, or two lifting rings 108 distributed at both ends of the cross beam 101. The hook of the metallurgical hoist can be correspondingly hooked on the lifting ring 108 or the protruding portion 106 to realize the hoisting of the electric bun 1.

[0032] Further, in some embodiments, the power supply assembly 40 is a remote power automatic plugging and unplugging device, which includes a female head 105 and a male head 104. The female head 105 is fixedly connected to a side protrusion 106 and is electrically connected to the tilting drive member 20. The male head 104 is fixedly installed in a designated area within the outer layer hood 4 and is located on the side of the female head 105 away from the cross beam 101. The male head 104 includes a plug and a telescopic member, and the telescopic member can be an electric push rod. The plug is installed on the movable end of the electric push rod. The plug is electrically connected to an external power supply and can be correspondingly inserted into the female head 105 under the drive of the telescopic member to achieve the control of remote power supply for the tilting drive member 20.

[0033] In some embodiments, the power supply assembly 40 is a low-voltage power supply assembly, which includes a voltage reduction device, a conductive device, and a voltage boost device. The voltage reduction device and the voltage boost device are prior arts. The voltage reduction device is arranged outside the outer layer hood 4 and is electrically connected to the fixed support frame 3. The conductive device is installed on the protrusion 106 and is electrically connected to the voltage boost device, and the voltage boost device is electrically connected to the tilting drive member 20. The 380V power supply (three-phase or single-phase) voltage is reduced to a safe voltage of 36V (or 24V) through a voltage reduction system, and then the 36V safe voltage is fed to the fixed support frame 3. After the protrusion 106 of the electric ladle 1 contacts the limit groove 31, the low-voltage electricity is sent to a step-up transformer through the conductive device, and the step-up transformer boosts the voltage to 380V, so as to drive the tilting drive member 20 of the electric ladle 1 to work and drive the ladle body 30 to perform a tipping action.

[0034] As shown in the figure, the specific implementation process of the present invention is as follows: First, use a metallurgical crane to place the empty electric ladle 1 on the electric flatbed truck 64. The electric flatbed truck 64 drives into the ladle box 62 along the track 63. Then, a smelting furnace (such as a flash furnace, an Ausmelt furnace, or a side-blown furnace, etc.) discharges materials, and the materials 50 enter the ladle body 30 through the chute 61. After the ladle body 30 is filled with materials, use a metallurgical crane to lift the electric ladle 1 to the PS converter area, open the cover of the outer layer hood 4, then hang the electric ladle 1 on the fixed support frame 3 in front of the metallurgical furnace 2, and then the metallurgical crane withdraws, and the cover of the outer layer hood 4 is closed. Start the remote power automatic plugging and unplugging device to make the plug insert into the female head 105. At this time, the tilting drive member 20 is powered on and operates, and then the ladle body 30 tilts to pour materials until the pouring is completed, and then tilts in the reverse direction to make the ladle body return to its original position. During the entire feeding process, the ladle body 30 completes the feeding action completely in a closed space.

Claims

1. A feeding system for a metallurgical furnace, characterized in that: it includes a fixed support frame (3), an electric ladle (1) arranged on the fixed support frame (3), an outer hood (4) covering above the fixed support frame (3), a hoisting device for hoisting the electric ladle (1) into the outer hood (4), and a metallurgical furnace at least partially located in the outer hood (4). The furnace mouth of the metallurgical furnace is located in the outer hood (4) and is correspondingly arranged with the electric ladle (1). The electric ladle (1) includes a hanger (10) detachably installed on the fixed support frame (3), a ladle main body (30) rotatably installed on the hanger (10), a tilting drive member (20) for driving the ladle main body (30) to tilt, and a power supply assembly (40) for supplying power to the tilting drive member (20); an entrance and exit for the electric ladle (1) to enter and exit and a cover for controlling the opening and closing of the entrance and exit are provided on the outer hood (4); the power supply assembly (40) is a remote power automatic plugging and unplugging device or a low-voltage power supply assembly; the power supply assembly (40) is a remote power automatic plugging and unplugging device, which includes a female head (105) installed on the hanger (10) and a male head (104) fixedly installed on one side of the female head (105). The female head (105) is electrically connected to the tilting drive member (20). The male head (104) includes a plug and a telescopic member for controlling the telescopic movement of the plug. The plug is electrically connected to an external power supply and can be correspondingly inserted into the female head (105) under the drive of the telescopic member; the power supply assembly (40) is a low-voltage power supply assembly, which includes a low-voltage power supply device for feeding power to the fixed support frame (3), a conductive device arranged on the hanger (10), and a boosting device installed on the hanger (10). The conductive device is electrically connected to the boosting device, and the boosting device is electrically connected to the tilting drive member (20); the hanger (10) includes a cross beam (101) and suspension rods (102) installed on the cross beam (101). Protrusions (106) are provided at both ends of the cross beam (101). A limit groove (31) for restricting the movement of the cross beam (101) is provided at the top of the fixed support frame (3). The protrusions (106) can be correspondingly lapped in the limit groove (31); the suspension rod (102) is at least two hinged rods (103) hinged in sequence at the head and tail. The hinged rod (103) at the topmost is fixedly connected to the cross beam (101). At least one of the adjacent hinged rods (103) that are mutually hinged is provided with a limiting portion (1031) for restricting the rotation angle of the hinged rod (103); a lifting ring (108) for hoisting is further provided on the cross beam (101). The lifting ring (108) is one lifting ring (108) located in the center of the cross beam (101) or multiple lifting rings (108) distributed on both sides of the cross beam (101).

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