WO2011071418A1

WO2011071418A1 - Electric steel melting shop

Info

Publication number: WO2011071418A1
Application number: PCT/RU2010/000742
Authority: WO
Inventors: Владимир Васильевич КУДРЯШОВ; Алексей Анатольевич ЧИБИСГУЛЕВ; Сергеи Александрович ИВАНОВ; Роман Анатольевич ДМИТРИЕВ
Original assignee: Kudriashov Vladimir Vasilievich; Chibisgulev Aleksey Anatolievich; Ivanov Sergey Aleksandrovich; Dmitriyev Roman Anatolievich
Priority date: 2009-12-09
Filing date: 2010-12-09
Publication date: 2011-06-16

Abstract

The group of inventions pertains to the steel industry and, in particular, to electric steel melting shops. An arc steel furnace section, a section for treating steel outside the furnace, and a continuous ingot casting machine section of the electric steel melting shop are arranged about a circle, inside which a circular central section is formed. In a first embodiment of the invention the central section contains a rotating device for transporting raw materials and a circular rail path for the movement of casting ladle cars between the arc steel furnace section, the section for treating steel outside the furnace and the continuous ingot casting machine section. In a second embodiment of the invention the central section contains a rotating device for transporting raw materials and liquid metal. The invention dispenses with the need for a large number of cranes and support structures in the organization of operations and the flow of material.

Description

Electric smelting shop

The invention relates to the field of metallurgy and, in particular, to steelmaking.

Currently, steel production is carried out on the so-called technological lines, formed, as a rule, from a steel-smelting unit, an out-of-furnace steel processing device, and a casting device that are interconnected by vehicles (RF patent for invention No. 2285050 with priority dated 04.05.2005. according to class IPC S21C5 / 56).

A technological article production line is also known, containing a steel-smelting unit interconnected by crane and floor vehicles, an out-of-furnace metal processing section and a casting section (certificate for utility model N '21198 with a priority dated 02.10.2001 according to class MPK С21С5 / 28).

The specified production lines are located in the workshops. The mutual arrangement of the main units, in particular, arc steel-smelting furnaces, out-of-furnace metal processing plants and continuous casting plants, determines the design of the workshop as a whole. These workshops, as a rule, are carried out by three-span or four-span (the book of the authors L.E. Nikolsky, I.Yu. Zinurov “Equipment and design of electric arc furnaces. Moscow, Metallurgy, 1993.).

Three-span and four-span workshops have a number of common features. In these workshops, charge and casting spans adjoin the furnace span. An arc steelmaking furnace (or furnaces) is located on the border with the casting span and steel is released into a steel pouring ladle transported by an overhead crane.

The width of the charge span in the well-known three-span workshops is about 30 m, the furnace span is 20 m, the casting span is 21.5 m. The total length of the workshops is 156 - 312 m. The furnace span is served by four bridge cranes, the casting span is served by two casting cranes and three harvesting bridge by cranes.

The dimensions of the spans (width, height, length), the number and carrying capacity of cranes, as well as other equipment are determined by the productivity of the workshop, the capacity of one arc furnace, and their total number. Of great importance in the design of the main building of the steelmaking workshop is the organization of freight flows inside the workshop. The main cargo flows are associated with ensuring the supply of scrap metal to the furnace, the supply and loading of slag-forming materials and ferroalloys, the loading of alloying, slag cleaning, steel casting and transportation of billets to rolling shops.

A furnace steelmaking furnace or two furnaces, an out-of-furnace steel processing unit with electric furnace substations, and all the equipment necessary for their maintenance are located in the furnace span.

All this leads to a large increase in the cost of investment in the design and construction of metallurgical enterprises, to an increase in staffing and operating costs, while reducing labor productivity.

The closest technical solution is an electric steelmaking workshop, the premises of which include walls and a roof, inside of which there is a furnace section (DSP), an out-of-furnace steel processing section (BOC) and a casting section (NLZ), served by devices for transporting raw materials and liquid metal in the form of crane equipment and steel trucks moving along rail tracks (authors book L.E. Nikolsky, I.Yu. Zinurov “Equipment and design of electric steel-smelting shops”, Moscow, Metallurgy, 1993. p. 248-249, Fig. 94-95).

The building of the steelmaking workshop consists of the following spans: furnace, bunker, distribution, casting and span for processing and loading workpieces. All spans are in the form of a quadrangular prism, at the borders of which crane columns, supports with metal structures are arranged. The main disadvantages of the above workshops are the following. The complex organization of work and cargo flows, and as a result, the presence of a large crane economy, significant losses of time and energy during long movements. The presence of several spans leads to the need for the construction of a large number of supporting structures, metal structures. A complex scheme for organizing gas suction and evacuation and the need to equip exhaust systems over each emission source. Significant difficulty in automation and control of the production process due to the complexity of combining different plants into a single continuous process.

The technical task of the claimed inventions is the creation of a fly-free electric furnace shop, in which the organization of work and cargo flows does not require a large crane facilities and eliminates the need for a large number of cranes and supporting structures, which will generally increase the reliability in the management of production processes while significantly reducing costs and, in addition , will create the opportunity to improve the evacuation of exhaust gases by creating a common no-fly space. The problem is solved by creating an electric steelmaking workshop, the premises of which include walls and a roof, inside of which there is a furnace section of chipboard, an extra-furnace steel processing section of BOC and a casting section of continuous casting machines connected by devices for transporting raw materials and liquid metal with a lifting device and steel trucks moving along rail tracks. According to the invention, the sections are arranged in a curved closed line in the sequence of chipboard - BOC - CCM with the formation of a central section between them and are oriented in space so that their longitudinal axes are planed radially to the center of this section, inside which there is a rail track for moving steel carriers, made circular, and the device for transporting raw materials and liquid metal is made rotary with the ability to move the lifting device from site to site and about provision of circular cargo flow around the central section.

The problem is also solved by the fact that the device for transporting raw materials and liquid metal is made in the form of a polar crane, resting on a circular rail, covering all sections and installed on columns located on the periphery of the columns, or in the form of a radial crane, resting on a central column located inside the central section, and a circular track rail covering all sections, and installed on columns located on the periphery of the sections.

The problem is also solved by the creation of an electric steelmaking workshop, the premises of which include walls and a roof, inside of which there is a furnace section (DSP), an out-of-furnace steel processing section (BOC) and a casting section (CCM), connected in a single technological cycle by a device for transporting raw materials and liquid metal with lifting device, which is characterized in that the sections are located along a curved closed line in the sequence of chipboard - VOS - CCM with the formation of a central section between them and oriented in space in such a way that their longitudinal axes are planed radially to the center of this section, inside which there is a device for transporting raw materials and liquid metal, made by turning with the possibility of moving the lifting device from site to site and providing a circular cargo flow around the Central site, and the transportation device ref one material and liquid metal is made in the form of a crane.

Moreover, the sections can be arranged in a plan in a circle at an angle of 90 ° to each other.

The problem is also solved by the fact that the walls of the workshop room are installed in a circle with the formation of the internal volume of the room of a cylindrical shape, and the roof of the workshop is dome-shaped with the possibility of providing a centralized gas outlet.

The claimed technical solutions are aimed at creating a no-fly electric steelmaking workshop with circular arrangement of sections of chipboard - VOS - CCM and the organization of circular cargo flow in the process of performing technological cycles of melting, out-of-furnace processing and casting.

Due to the circular arrangement of sections of chipboard - VOS -

CCM in a closed curved line eliminates the placement of equipment on rectangular spans, creates working conditions without a large number of cranes, which simplifies the process control system and reduces the working volume of the workshop. The combination of the plots within a single volume and their arrangement in a circle makes it possible to carry out the premises of a cylindrical workshop with a single domed roof, which allows for centralized gas removal from the premises. The invention is illustrated by drawings (Fig.1-4). Figure 1-3 shows a top view of the premises of the workshop with the roof removed, respectively, with a polar crane, a radial crane and a crane. In FIG. Shows a view of the workshop from the outside.

In Fig. 1, on a circular working platform, there is installed a circular steel-smelting furnace ДСП 1 with mechanisms for tilting the furnace, moving electrodes, raising and turning the roof with a furnace transformer (not indicated in the drawing), an out-of-furnace treatment of steel BOC 2 with a furnace transformer, mechanisms control system and a feed system of ferroalloys and additives (not indicated in the drawing), a continuous casting machine of CCM 3, a ladle heating station 4, a station 5 for storage bins for bulk materials and ferroalloys. Inside the circle on which the sections of chipboard, VOS, CCM are located, a central section 6 is formed, on the periphery of which a rail 7 is made to move the steel truck with the steel ladle 8 in a circle along the route chipboard> BOC> CCM> chipboard. Sections 1,2,3 in the plan are oriented in space so that their longitudinal axes 9,10,11 are located in the plan radially to the center of the central section 6, and the axes 9 and 10, as well as 10 and 11 form an angle between themselves 90 °.

On the columns 12, which are installed in a circle covering all sections 1,2,3 (chipboard, VOS, CCM), a rail track 13 is mounted to move the device for transporting raw materials and liquid metal with a lifting device. The device for transporting raw materials and liquid metal is made in the form of a polar crane 14 (Figure 1) or a radial crane 15 (Figure 2). A radial crane 15 is mounted on a hinge support 16 on the central column 17. The lifting device is mounted on a trolley 18, which moves along the radius of the central section b. The rotation of the polar crane 14 is due to its movement along the rail 13, and the radial crane is rotating it around the axis of the central column 17 on the hinge support 16 and moving along the rail 13.

The walls 19 of the workshop premises are made in a circle of cylindrical shape, and the roof 20 is dome-shaped, on which a centralized gas removal device 21 is placed (Fig. The all technological posts necessary for the implementation of the full technological cycle are located on the work site, such as melting, steel processing and casting, such such as ladle heating posts, power equipment, a bulk dosing and supply system, scrap truck, etc.

Fig. 3 shows an embodiment of a device for transporting raw materials in the form of a crane, based on the Liebherr R 996 Litronic mining bucket excavator, where instead of the bucket traditional grabs for steel buckets are used. The crane 26 is located inside the central section 6 and carries out the movement of the lifting device from section to section, providing circular cargo flow around the central section, which eliminates the need for rail tracks.

The parameters of the working platform, as well as the technological equipment, are determined based on the production capacity of the designed and constructed electric steel-smelting shop.

The minimum capacity of an electric arc furnace that allows you to work in a continuous technological chain of chipboard> VOS> CCM> rolling mill is a nominal capacity of 15 tons. The optimal annual production capacity of the workshop will be 130,000 tons of liquid steel.

This is achieved by the fact that on a circular platform at an angle of 90 ° the main technological units of chipboard, VOS and continuous casting machines are located. Between them along a circular rail track 7 moves a steel carrier 8 with a steel pouring ladle (Figure 1). In the space between the chipboard and VOS, there is a bunker station 5 for bulk and ferroalloys with two skip hoists. In space between the continuous casting machine and the chipboard there is a lining section of the buckets 22. On the support columns 12, which are installed around the perimeter of the circular platform, a rail track 13 is mounted along which the polar crane 14 moves (rotates) (Figure 1) or the radial crane 15 (Figure 2) , covering the entire area of the circular work area with the coverage area. The debt of the crane on service time meets the needs of all units and the process itself throughout the circular site. Thus, the need for a large number of bridge cranes and personnel for their maintenance is significantly reduced.

Fig. 3 shows a solution with sections located along a curved closed line in the sequence of chipboard - BOC - CCM with the formation of a central section b between them and oriented in space in such a way that their longitudinal axes 9, 10, 11 in plan are located radially to the center of this section, inside which there is a device for transporting raw materials and liquid metal, made rotary with the ability to move the lifting device from section to section and providing circular cargo Single around the central portion, e.g., a crane, whereby excluded rail path.

The use of unplanned placement of technological equipment of the steelmaking shop on a circular platform simplifies the in-shop flow diagram of the cargo, in addition, the general domed roof allows centralized suction of 21 all types of gas emissions in the shop (Fig. A).

To obtain a continuous melting and foundry complex, a span for a rolling mill can be attached to the circular site of the steel mill from the CCM side. The main condition for the continuous operation of the technological units when placing them on a no-fly circular platform with a polar crane 14 (Fig. 1) or a radial crane 15 (Figure 2) and a ring movement of a steel truck with a steel pouring ladle 8 or a crane is the equality of the clock productivity of chipboard and CCM (i.e. q ac chipboard = q ac CCM).

The main cycle of work is as follows. A bucket loaded in a batch yard with a batch truck 23 is fed along a rail 24 to a working platform and then fed with a polar crane 14 (Fig. 1) or a radial crane 15 (Fig. 2) to a chipboard furnace, where it falls down after raising and turning. to the oven. After melting and heating to 1600 ° C, the melt is poured into a steel pouring ladle 8 mounted on a steel truck, and then the steel truck moves along rail 7 to the BOC installation, where heating, lapping and alloying takes place. At the end of the out-of-furnace treatment, the steel truck with the steel pouring ladle 8 moves with liquid steel to the continuous casting machine, where it is installed on a two-position mobile stand of the casting machine 3 with a polar 14 (Fig. 1) or radial 15 (Fig. 2) crane, and the steel truck 8 returns along the ring path to chipboard. After casting, the empty bucket is moved by a crane. to the ladle lining section to prepare it for the next heat.

When using a crane-manipulator (FigZ), the main cycle of work is as follows. A tub loaded with a scrap truck 23 loaded in the batch yard is fed to the working platform and then fed with a crane 26 to an arc steel-smelting furnace 1, where, after raising and turning the roof, it falls into the furnace.

After melting and heating to 1600 ° C, the melt is poured into a steel pouring ladle 8 and then the crane 26 moves it to the installation 2 for secondary furnace treatment of BOC steel, where heating, finishing and alloying takes place. At the end of the out-of-furnace treatment, the crane 26 moves steel pouring ladle 8 with liquid steel to the NLZ steel continuous casting machine 3, where it is mounted on a two-position mobile stand of the casting machine. After casting, the empty bucket 8 is moved by a crane 26 to the lining section of the buckets 22 to prepare it for the next smelting.

The use of a crane-manipulator, made rotary, allows you to move the lifting device from site to area with the provision of circular cargo flow 27 around the Central section 6.

Slag s. the furnaces are poured into a bowl, which is transported out of the workshop by a special slag carrier-tilter 25.

The application of the proposed invention provides a reduction in capital costs during construction of about 28%, which is achieved due to the following factors.

With equal volumes of steelmaking shops (and spans) during their construction according to the well-known analogue and according to the invention, the side surface area of the proposed invention is less by 28.5%. Accordingly, the perimeter of the working platform in the proposed solution is less. In this regard, the volumes of construction and installation works are proportionally reduced, as well as the costs of building materials, metal structures, electric cables, etc.

The invention will find wide application in the metallurgical industry when creating mini-plants for the implementation of the melting and foundry rolling process.

Claims

CLAIM

1. Electric steelmaking workshop, the premises of which include walls and a roof, inside of which there is a furnace section (DSP), an out-of-furnace steel processing section (BOC) and a casting section (CCM), connected in a single technological cycle by a source and liquid metal conveying device with a lifting device and steel trucks moving along rail tracks, characterized in that the sections are located on a curved closed line in the sequence of chipboard - BOC - CCM with the formation of a central section between them and oriented in space in such a way that their longitudinal axes in plan are located radially to the center of this section, inside which there is a rail track for moving steel carriers, made circular, and the device for transporting raw materials and liquid metal is made rotary with the possibility of moving the lifting device from section to section and provision of circular cargo flow around the central section.

2. The electric steelmaking shop according to claim 1, characterized in that the device for transporting raw materials and liquid metal is made in the form of a polar crane resting on a circular rail that covers all sections and is installed on columns located around the periphery of the sections.

3. The electric steelmaking shop according to claim 1, characterized in that the device for transporting raw materials and liquid metal is made in the form of a radial crane resting on a central column located inside the central section and a circular-shaped rail track covering all sections and installed on on the periphery of sections of the columns.

4. Electric steelmaking shop no. 1, characterized in that the sections of the BOC and the accident are located in the plan at 90 ° to the particleboard section.

5. Electric steelmaking shop according to claim 1, characterized in that the walls of the shop premises are installed in a circle with the formation of the internal volume of the premises in a cylindrical shape.

6. Electric steelmaking workshop according to claim 1, characterized in that the roof of the workshop is dome-shaped with the possibility of providing a centralized exhaust gas.

7. Electric steelmaking workshop, the premises of which include walls and a roof, inside of which there is a furnace section (DSP), an out-of-furnace steel processing section (BOC) and a casting section (CCM), connected in a single technological cycle by a source and liquid metal conveying device with a lifting device , characterized in that the sections are located on a curved closed line in the sequence of chipboard - VOS - CCM with the formation of a central section between them and oriented in space so that their the longitudinal axes in the plan are located radially to the center of this section, inside which there is a device for transporting raw materials and liquid metal, made rotatable with the ability to move the lifting device from section to section and providing circular cargo flow around the central section.

8. Electric steelmaking shop according to claim 7, characterized in that the device for transporting raw materials and liquid metal is made in the form of a crane.

9. Electric steelmaking shop according to claim 8, characterized in that the sections are located in a plan at 90 ° to each other.

10. Electric steelmaking shop according to claim 8, characterized in that the walls of the shop premises are installed in a circle with the formation of the internal volume of the premises in a cylindrical shape.

11. Electric steelmaking shop according to claim 8, characterized in that the roof of the shop is dome-shaped with the possibility of providing a centralized exhaust gas.