RU15730U1 - DEVICE FOR CONTINUOUS RELEASE OF CAST IRON FROM BLAST FURNACE - Google Patents

Abstract

Device for the continuous release of cast iron from a blast furnace

The utility model relates to metallurgy and can be used for continuous controlled release of pig iron from a blast furnace. The model provides isolation from the hearth of a blast furnace in special modes of operation of the latter with subsequent repeated inclusion in the work. This is achieved by the fact that the exhaust channel 2 made in the body of the cast iron notch 1 of the blast furnace

has a ± - shaped shape. Cavity 7 of the magnetohydrodynamic pump (MHD) 3

on the one hand, it is connected with a cavity 8 of a lifting and transport metal wire, and on the other hand, with a cavity 9 of a vertical section 10 of channel 2. Under the MHD pump 3, refrigerators 11 are installed in the vertical section 10 of channel 2 with the perimeter of the latter, operating either in the exhaust mode heat, or in the locking mode of channel 2. Section 12 of channel 2 is filled with a refractory mass. In a special mode, the MHD pump 3 drives the cast iron out of the metal wire into the hearth, and the cast iron remaining in the cavity 7 of the pump 3 and cavity 9 of the vertical section 10 of channel 2 is frozen by refrigerators 11. Then, section 12 of channel 2 is drilled and the cast iron is released through opening 13 of the groove 1 into the gutter 15. A cork made of solidified cast iron isolates the forge 14 from the metal wire, which allows for repair work, f id.

Abstract to certificate No.

Description

Object - USEFUL MODEL Device for the continuous release of cast iron from a blast furnace

The utility model relates to the field of metallurgy and can be used for continuous controlled release of high-temperature electrically conductive melt from a pressure vessel, mainly cast iron from a blast furnace.

A device is known for the continuous production of pig iron and slag from a blast furnace, containing a metal outlet connected to a vertical riser, in the upper part of which there is a cylindrical shutter made of refractory cork connected to an actuator, slag-discharge and metal-feed troughs connected to a vertical riser, and a hot inert pipeline gas connected to a cylindrical shutter (see. St. Petersburg USSR No. 905286, C21B7 / 14).

The disadvantage of this device is the inability to completely isolate the metal outlet in cases, for example, blowing the furnace, stopping it, etc. due to the fact that under a closed stopper the metal outlet channel and part of the vertical riser connected with the mining will be filled with liquid melting products, as a result of which, in the above cases, the melting products will solidify in the channels. In addition, clogging of the channel with coke is possible, which will also lead to the impossibility of further operation

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devices. The supply of refractory mass into the channel from its end with the help of a gun will cause it to fall into a vertical riser under the refractory plug, which also prevents the further use of the known device for its intended purpose.

The closest analogue to the claimed object is a device for the continuous release of cast iron from a blast furnace, containing an exhaust channel made in the body of a cast iron notch, a magnetohydrodynamic pump placed on the outside of the furnace, the cavity of which is connected to the cavity of the exhaust channel on one side and to the lifting transport cavity a metal wire equipped with an inert gas supply unit (see the application of Germany No. 2110401, С21В7 / 14).

A disadvantage of the known device is the inability to isolate it from the hearth of a blast furnace under special modes of operation. So, for example, when the furnace stops, the coke in the furnace settles and clogs the duct for the release of cast iron, which cannot be cleaned or blocked. This prevents reuse of the device.

The utility model is based on the task of developing such a device for the continuous production of pig iron from a blast furnace, which makes it possible to isolate it from the furnace of a blast furnace in special operating modes, such as blowing, blowing period, quiet running, stopping, etc., followed by its repeated inclusion in operation when the blast furnace goes to steady state.

The problem is solved in that in the known device for the continuous release of cast iron from a blast furnace containing an exhaust channel made in the body of a cast iron notch, located outside the notch

magnetohydrodynamic pump, the cavity of which is on the one hand connected with the cavity of the exhaust channel, and on the other with the cavity of the material handling conveyor equipped with an inert gas supply unit, according to the change

the exhaust channel is made ± - shaped cavity

the magnetohydrodynamic pump is in communication with the cavity of the vertical section of the exhaust channel, on which refrigerators are installed under the magnetohydrodynamic pump with the perimeter of the vertical section of the channel, and the section of the exhaust channel located between its vertical section and the outlet of the notch is filled with a refractory mass.

The essence of the utility model is illustrated in the drawing, which shows a General view of the inventive device, a longitudinal section.

A device for the continuous release of pig iron from a blast furnace contains

made in the body of a cast iron taphole 1 exhaust channel 2 l. - shaped

magnetohydrodynamic (MHD) pump 3, located outside of the notch 1, metal wire, consisting of lifting 4 and transport 5 sections, at the junction of which an inert gas supply unit is installed, made, for example, in the form of a nozzle 6. Moreover, cavity 7 of the MHD pump 3 on the one hand it is connected with the cavity 8 of the lifting and transport metal wire, and on the other hand, it is communicated with the cavity 9 of the vertical section 10 of the exhaust channel 2. On the vertical section 10 of the channel 2 with a perimeter coverage set under

MHD - pump 3 refrigerators 11. Another section 12 ± - shaped exhaust

channel 2, located between its vertical section 10 and the outlet 13 of the cast iron notch 1, is filled with a refractory mass, for example.

pulmonary clay. The hearth 14 of the blast furnace communicates via an exhaust channel 2 with a main hearth chute 15.

The device operates as follows. In the steady state, smelting of pig iron from the furnace 14 of the blast furnace under the pressure of the furnace gases and a column of liquid products through the exhaust channel 2 enters the cavity 7 of the MHD pump 3 through the cavity 9 of the vertical section 10, since the section 12 of the exhaust channel 2 from the vertical section 10 to the output the holes 13 are filled with a refractory mass. The cast iron located in the cavity 7 of the MHD pump 3 is affected by the magnetic field created by the pump 3. In this case, the refrigerators 11 operate in a heat removal mode, increasing the resistance of the refractories in the transition section of the cavity 9 of the vertical section 10 of the exhaust channel 2 into the cavity 7 MHD pump 3. From the cavity 7 of the MHD pump 3, the cast iron rises to the highest point along the lifting section 4 of the metal wire, from where, after the jet is broken by an inert gas supplied through the nozzle 6, metal is opened by a free flow through the transport section 5 Wire is delivered to the consumer. In this case, most of the gas pressure and the hydrostatic pressure of the cast iron and slag column in the furnace are balanced by the hydrostatic pressure of the cast iron column in cavity 7 of the MHD pump 3 and cavity 8 of the lifting section 4 of the metal wire, and the remaining part of the pressure is balanced by the MHD pump 3, which reduces the required pressure drop of the metal at the inlet and outlet of the MHD pump 3 several times. The height of the lifting section 4 of the metal wire is chosen so that the MHD pump 3 can provide automatic control of the flow rate of cast iron, thereby maintaining a technologically feasible level of cast iron in the furnace at any blast pressure possible in operation, given that at low values

of the latter, the MHD pump 3 by a simple switching of the electric circuit works like a pump, and at high - like a valve, creating the necessary back pressure.

If it is necessary to transfer the blast furnace to a special mode of operation, for example, silent running, stopping, blowing, blowing period, or replacing elements of the device, the cast iron is worked out by the claimed device as follows. After preliminary lowering the pressure of the blast and the level of smelting products in the furnace 14, the MHD pump 3 expels the cast iron from the cavity 8 of the lifting section 4 of the metal wire to the furnace 14, and the metal remaining in the cavity 7 of the MHD pump 3 and the cavity 9 of the vertical section 10 of the channel 2 is frozen with intense cooling provided by refrigerators 11, which for this is transferred to the locking mode, as well as the cooling system of the MHD pump 3. A plug of solid cast iron, which was formed in cavities 7 and 9, cuts off the cavity 8 of the metal wire 4 from the hearth 14, allowing metal wire repair or replacement of its elements. After the cork is formed, the refractory mass located in section 12 of channel 2 is drilled using a standard drill and the liquid smelting products are discharged from the hearth 14 through channel 2 through the outlet 13 of the notch 1 into the main hearth chute 15 and further into the ladles. At the end of the production, a flying mass is fed using a standard gun for the entire length of channel 2. At the same time, a plug of hardened cast iron located in cavities 7 and 9 prevents the flight mass supplied under pressure from entering channel 2 into its vertical section 10. After this device is ready to work on the traditional technology of release. Moreover, if for repair it is necessary to remove the MHD pump 3, then the iron and slag are discharged through other slots of the furnace (not shown in the figure).

The reverse transition of the claimed device to continuous release is as follows. The refractory mass located in the channel 2 is drilled from the side of the main gutter channel 15 only to the vertical section 10. The MHD pump 3 is switched on in the induction heating mode and the cast iron plug located in the cavities 7 and 9 is melted, as a result of which molten iron is in section 12 channel 2 flows into the chute 15. After heating the lining of the lifting 4 and transport 5 sections of the metal wire to operating temperature by sucking through them the combustion products of gaseous fuel, the remaining refractory mass in channel 2 is drilled to the hearth 14 and give a new portion of it to the section 12 of channel 2, thereby isolating it from the trough 15. The MHD pump 3 is turned on in the locking mode until the technologically feasible level of cast iron is reached in furnace 14, after which the MHD pump 3 operates in automatic mode.

Thus, the inventive device provides the ability to isolate it from the furnace hearth in special modes of operation and its subsequent repeated inclusion in the work when the blast furnace goes to steady state.

In addition, the inventive device allows you to automatically adjust the speed of the flow of pig iron from the hearth, thereby maintaining a technologically feasible level in the hearth, as well as reduce energy consumption during the operation of the MHD pump ..

Claims (1)

A device for the continuous release of cast iron from a blast furnace, comprising an exhaust channel made in the body of a cast iron notch, a magnetohydrodynamic pump located outside the notch, the cavity of which is connected on one side with the cavity of the exhaust channel and, on the other, with the cavity of the material handling conveyor equipped with an inert feed unit gas, characterized in that the exhaust channel is made ┴-shaped, the cavity of the magnetohydrodynamic pump is in communication with the cavity of the vertical section of the exhaust channel, on which d with a magnetohydrodynamic pump covering the perimeter of the vertical section of the channel, refrigerators are installed, and the section of the outlet channel located between its vertical section and the outlet of the notch is filled with a refractory mass.