RU2487306C1 - Device to charge metallised pellets into arc furnace - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: device comprises a unit of metallised pellets feed is made in the form of a supplying flexible hose, a cone funnel from electric insulation material with a cylindrical tip and auxiliary nozzles for supply of gas mixture under pressure into a flow of metallised pellets. At the same time the receiving funnel is made with a nozzle arranged on its bottom, to which the upper end of the flexible hose is fixed, the lower end of which is arranged inside the cone funnel, the cylindrical tip of which is placed in the axial hole of the hollow electrode.

EFFECT: invention makes it possible to increase efficiency of processes of metallised pellets melting in an arc furnace bath due to supply of pellets into zone of high temperatures in electrode sheath of an arc furnace.

5 cl, 3 dwg

Description

The invention relates to metallurgy, and in particular to devices for loading a charge, for example, metallized pellets and other bulk materials into melting units.

The invention is known for loading a charge, including metallized pellets into a melting tank, for example, in an electric arc steel furnace (DSP) through a loading pipe under forced pressure [French Patent No. 1385224, cl. B22d, 1964. The method of loading the mixture into a melting tank].

In addition, a device is known based on the application of the method [Auth. testimonial. USSR (II) 711336. BI No. 3 dated 01/25/1980 // Method for loading metallized pellets into a melting tank. Authors: N.A. Manyak et al.] Loading metallized pellets into a melting tank, for example, in an arc steel-smelting furnace.

The disadvantage of these known devices [French Patent No. 1385224, cl. B22d, 1964. Method for loading a charge into a melting tank; Auth. testimonial. USSR (II) 711336. BI No. 3 dated January 25, 1980 // Method for loading metallized pellets into a smelting tank. Authors: N.A. Manyak et al.] Is their bulkiness, as well as the fact that loading pipes are used to load metallized pellets into an arc furnace (DSP), which allow feeding metallized pellets beyond the influence of electric arcs, that is, in this case, the pop-up pellets are outside the high-temperature zones and, in addition, there is heating and wear of the loading pipe in the working space of the chipboard, and there is additional oxidation of metallized pellets [French Patent No. 1385224, cl. B22d, 1964. The method of loading the charge into the melting tank] depending on the approach or removal of the end of the loading tube from the surface of the slag metal melt.

The objective and purpose of the invention is to develop a more advanced device for loading metallized pellets in an arc furnace without the above disadvantages, which allows to increase the yield [Auth. testimonial. USSR (II) 711336. BI No. 3 dated January 25, 1980 // Method for loading metallized pellets into a smelting tank. Authors: N.A. Manyak et al.], To increase the performance of particleboard and improve the quality of the metal by reducing the oxygen content in it.

A device is known [Merker E.E. and others. RF patent for the invention No. 2374582 of 11/27/2009, BI No. 33, class. C21C 5/48], using the principle of supplying metallized pellets to the particleboard bath through hollow electrodes [Martynenko AK etc. A device for supplying gas to a hollow electrode. Auth. testimonial. USSR No. 293443, class C21C 5/52, 1978], and at the same time metallized pellets are fed through these hollow electrodes [E. Merker. and others. RF patent for the invention No. 2374582 of 11/27/2009, BI No. 33, class. C21C 5/48], bulk materials and gas mixtures under pressure. A significant drawback of these devices [Merker E.E. and others. RF patent for the invention No. 2374582 of 11/27/2009, BI No. 33, class. C21C 5/48. Martynenko A.K. etc. A device for supplying gas to a hollow electrode. Auth. testimonial. USSR No. 293443, class C21C 5/52, 1978], as well as other known devices [French Patent No. 1385224, cl. B22d, 1964, a method for loading a charge into a melting tank .; Auth. testimonial. USSR (II) 711336. B.I. No. 3 dated January 25, 1980 // a method for loading metallized pellets into a melting tank. Authors: N.A. Manyak et al.], Is their cumbersome design, which does not allow efficient, without downtime, use of these devices in difficult production conditions, for example, in the conditions of operation of arc steel-smelting furnaces. All these shortcomings do not allow to date to effectively use all known devices for loading metallized pellets in particleboard conditions in order to achieve high energy technological and technical and economic indicators of production.

The closest analogue of the invention is a device [Izgaliev T.I. and others. A method of controlling the process of smelting metallized pellets in an arc furnace. Auth. testimonial. USSR No. 523142, cl. C21C 5/52, 1976], based on the use of a method for controlling the process of smelting metallized pellets in an arc steel furnace. The essence of this invention lies in the fact that the device for loading metallized pellets into the furnace provides for continuous supply of pellets to the furnace according to the information of the dependence of the loading speed of the pellets on the electric power taken from the network and the correction of the loading speed of the pellets in proportion to the deviation of the metal temperature from the set value.

The main disadvantage of this prototype is that the design of the device provides for the loading of metallized pellets into the chipboard space outside the limits of the influence of electric arcs, i.e. the pellets fall into the slag, are oxidized and slagged, which does not allow to achieve high melting speeds of the pellets in the bath of the arc furnace.

Martynenko A.K. etc. A device for supplying gas to a hollow electrode. Autosvid. USSR No. 293443, class C21C 5/52, 1978], which are known in devices for loading metallized pellets into a furnace through hollow electrodes [E. Merker and others. RF patent for the invention No. 2374582 of 11/27/2009, BI No. 33, class. C21C 5/48; Martynenko A.K. etc. A device for supplying gas to a hollow electrode. Auth. testimonial. USSR No. 293443. class C21C 5/52, 1978] into the high temperature zone, and the device is also not designed [French Patent No. 1385224, cl. B22d, 1964. Method for loading a charge into a melting tank; Auth. testimonial. USSR (II) 711336. BI No. 3 dated January 25, 1980 // Method for loading metallized pellets into a smelting tank. Authors: N.A. Manyak et al.], Which allows loading metallized pellets as close as possible to the melt using loading tubes.

The present invention solves the problem of developing a more advanced device for loading metallized pellets in a chipboard, which allows, on the one hand, to eliminate the disadvantages of the prototype and other above devices, and on the other, to ensure the operation of the device with higher energy-saving and technological performance of the unit, for example, arc furnaces for melting metallized pellets. This is achieved by the fact that the proposed device for loading metallized pellets in an arc furnace, including a receiving funnel and a feed unit for metallized pellets, made in the form of a supply flexible hose, a conical funnel of electrical insulating material with a cylindrical tip and auxiliary pipes for supplying gas mixture under pressure to the stream metallized pellets, while the receiving funnel is made with a pipe located on its bottom, to which is attached the upper end of the flexible hose, the lower The edge of which is located inside the cone funnel, the cylindrical tip of which is placed in the axial hole of the hollow electrode, in addition, a conveyor system for supplying metallized pellets to a flexible hose connected to the control computer is located above the receiving funnel, the cone funnel has auxiliary nozzles for supplying gas mixture under pressure containing argon, nitrogen, natural gas, the cone funnel in the upper center has a ball insert with an opening in which it is placed with the possibility of vertical movement on the lower end of the inlet flexible hose, the cylindrical tip of the cone funnel is connected to the axial hole of the hollow electrode by a thread.

The present invention is implemented using a device (see figure 1), including a control system for the consumption of metal charge (1) for electric melting, a sensor for the flow of bulk materials (2), a control computer (3), a hopper for the consumption of metallized pellets (4) for the process of smelting pellets as well as a conveyor system (5) for loading pellets and bulk materials (6).

The work according to the invention is as follows. For electric steel melting, pellets (4) are loaded into a receiving funnel (7), which then enter through flexible hoses (22), conical funnels (24) and hollow electrodes (16) into the bath (17) of the arc furnace (8). For electric smelting of metallized pellets, the consumed power of electricity is recorded by the sensor (9), and the consumption of pellets and bulk materials is regulated by the actuator (10) with the control of the temperature of the metal (11) in the furnace, as well as by monitoring the active power by the sensor (12), the flow rate of the pellets by the sensor ( 13) and fixing the signals with current sensors (14) and voltage (14) in the electrical circuit. In this case, using the metal temperature control system (11) and the control computer (3), the heat absorption value of the bath (18) of the arc furnace is calculated, and this signal is transmitted to the actuator (10). The voltage (Fig. 1) from the electric network (9, 12, 14, 15) is transmitted by the electrode holders (19) to the hollow electrode (16) through the axial holes (21 in Fig. 2) along which the metallized pellets (20) move in the gas stream mixture (argon, etc.) supplied through nozzles (23) to a conical funnel (24). In this case, the conical funnel (24) is rigidly fixed by a hollow riser (25) on the electric holder (19). As a result of the supply of electricity through the electrode holder (19) to the hollow electrodes (16 in FIG. 1) and upon their contact with the metal (17), high-temperature electric arcs (26 in FIG. 2) are formed, in the volume of which they are heated, and then in the slag ( 27) metallized pellets are melted (20).

Figure 3 shows a new design diagram of the assembly of the device that allows the supply of pellets from a flexible hose (12) to a conical funnel (24) under the pressure of the gas mixture entering through the nozzles (23) into the axial hole (21) of the electrode (16). The lower end of the flexible hose (28 in Fig. 3) is inserted into the hole of the ball insert (31), and the cylindrical tip (29) with thread (30) is screwed into the hole with thread (30) of the electrode (16). Such a design (Figs. 1 and 2) of the proposed device allows loading metallized pellets under pressure (Fig. 3) using gas mixtures, and the gas supply (argon, etc.) is designed to stabilize the characteristics [Merker E.E. and others. RF patent for the invention No. 2374582 of 11/27/2009, BI No. 33, class. C21C 5/48; Okorokov N.V. and others. The efficiency of the arc furnace on tubular electrodes. - M.: “Electrotherm”, No. 19, 1962, p.13-19] of the electric arc, as well as to intensify the processes of melting metallized pellets in the bath [N. Okorokov. and others. The efficiency of the arc furnace on tubular electrodes. - M .: "Electrotherm", No. 19, 1962, p.13-19] of the arc furnace.

The effectiveness of the invention arises from the significant novelty of the design of the device for loading metallized pellets (1, 2, 3) in the bath of an arc furnace, which is confirmed by [Merker E.E. and others. RF patent for the invention No. 2374582 of 11/27/2009, B.I. No. 33, cl. C21C 5/48; Okorokov N.V. and others. The efficiency of the arc furnace on tubular electrodes. - M .: "Electrotherm", No. 19, 1962, p.13-19] experience of application [Okorokov N.V. and others. The efficiency of the arc furnace on tubular electrodes. - M .: "Electrotherm", No. 19, 1962, p.13-19].

Claims (5)

1. A device for loading metallized pellets into an arc furnace, including a receiving funnel and a node for supplying metallized pellets to the axial hole of the hollow electrode, characterized in that the node for supplying metallized pellets is made in the form of a supply flexible hose, a conical funnel of an insulating material with a cylindrical tip and auxiliary nozzles for supplying a gas mixture under pressure to a stream of metallized pellets, while the receiving funnel is made with a nozzle located on its bottom, to toromu attached the upper end of a flexible hose whose lower end is positioned within the conical funnel, a cylindrical tip which is placed in the axial bore of the hollow electrode. 2. The device according to claim 1, characterized in that on top of the receiving funnel there is a conveyor system for supplying metallized pellets to a flexible hose connected to a control computer. 3. The device according to claim 1, characterized in that the cone funnel has auxiliary nozzles for supplying under pressure a gas mixture containing argon, nitrogen, natural gas. 4. The device according to claim 1, characterized in that the conical funnel at the top center has a ball insert with a hole in which the lower end of the inlet flexible hose is placed with the possibility of vertical movement. 5. The device according to claim 1, characterized in that the cylindrical tip of the conical funnel is connected to the axial hole of the hollow electrode by a thread.

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