SU706451A1

SU706451A1 - Liquid metal scavenging tuyere

Info

Publication number: SU706451A1
Application number: SU782639473A
Authority: SU
Inventors: Борис Викторович Никифоров; Юрий Михайлович Клименко; Евгений Иванович Бехтер; Лев Дмитриевич Грицук; Илья Абрамович Немировский; Николай Гаврилович Щекин; Анатолий Степанович Горбик; Виктор Николаевич Андрющенко; Юрий Васильевич Башмаков; Константин Федорович Красильников
Original assignee: Днепродзержинский Ордена Трудового Красного Знамени Индустриальный Институт Им. М.И.Арсеничева
Priority date: 1978-07-07
Filing date: 1978-07-07
Publication date: 1979-12-30

Description

(54) ФУРМА ДЛЯ ПРОДУВКИ ЖИДКОГО МЕТАЛЛА(54) LIQUID METAL WASHING MILL

1one

Изобретение относитс к области черной металлургии, конкретнее к.конструкции фурм дл продувки жидкого металла газом в металлургических агрегатах , например, в кислородно-конверторном или мартеновском процессахThe invention relates to the field of ferrous metallurgy, more specifically to the construction of tuyeres for purging a liquid metal with gas in metallurgical aggregates, for example, in an oxygen converter or open-hearth process.

В современной практике сталеварени дл продувки жидкого металла в мартеновских и электропечах используютс одно- и многосопловьае-фурмы.In modern steelmaking practice, single- and multilobe tuyeres are used to purge liquid metal in open-hearth and electric furnaces.

Недостатками таких фурм вл етс фиксированное относительно ванны расположение кислородных струй. Это приводит к бурпс лу развитию окислительных процессов в реакционных зонах к повышению тeJ mepaтypы в них до . Железо при этом вскипает и частично испар етс . Часть паров железа покидает зону реагировани кислорода с металлом в виде бурого дыма. Угар железа в йьгм по причине достигает 2-3% от веса садки.The disadvantages of such tuyeres are the location of oxygen jets fixed relative to the bath. This leads to the development of oxidative processes in the reaction zones to increase the temperature of the reaction in them. The iron boils and partially evaporates. A part of the iron vapor leaves the oxygen reaction zone with the metal in the form of brown smoke. The iron loss in ygm due to reaches 2-3% of the weight of the cages.

Известна фурма, корпус которой выполнен вращающимс 1 .The known lance, the casing of which is made rotating 1.

Круговое перемещение сопл позвол ет снизить угар железа и повысить выход годного, однако конструкци фурмы достаточно сложна и поэтому не находит широкого применени .The circular movement of the nozzles makes it possible to reduce iron fumes and increase the yield, but the design of the tuyere is rather complicated and therefore does not find wide application.

Наиболее близким к изобретению по технической сущности и достигаемому i результату вл етс фурма дл продувки жидкого металла, содержаща концентрично расположенные трубы, образующие тракты дл подачи газа, подвода и отвода охладител , головку с соплами, в которой установлен ротор с по крайней мере одной направл ющей газового потока. В известной фурме ротор выполнен в виде крыльчатки с хвостовйксм, в котором выполнено отверстие дл направ11ени газового потока в сопла. Ротор установлен в кернах головки и может вращатьс 2 . .The closest to the invention with the technical essence and the achieved i result is a lance for blowing liquid metal, containing concentrically arranged pipes forming paths for gas supply, supply and removal of a cooler, a head with nozzles in which a rotor with at least one guide rail is installed gas flow. In the known lance, the rotor is made in the form of an impeller with a tailings, in which a hole is made to direct the gas flow into the nozzles. The rotor is mounted in the core cores and can be rotated 2. .

Така конструкци фурмы позвол ет обеспечить импульсную подачу газа иSuch a tuyere design allows for pulsed gas and

20 дискретное перемещение рёакцибнной .зоны относительно ванны, но при этом имеет место значительна потер налора газового потока на распределителе ,что отрицательно сказываетс 20 discrete movement of the reactive zone relative to the bath, but there is a significant loss of gas flow at the distributor, which has a negative effect

Claims

25 on the aerodynamics of gas jets and on the magnitude of the velocity of the outflow of gas, dramatically reducing the efficiency of the blowdown of the aggregate bath. The presence of one hole in the rotor leads to vibrations caused by the one-sided reactive action of the gas stream, therefore it appears necessary to take measures to fix the tuyere with special devices. The aim of the invention is to increase the efficiency of purging by reducing the pressure losses of the gas flow at the distributor and the elimination of tuyere vibrations. This goal is achieved by the fact that the rotor is made in the form of a cone, the base of which is facing the nozzles, and the direction of the gas flow in the form of a screw groove. With an even number of nozzles in the headpiece, the rotor can be made with two screw slots symmetrically located relative to the rotor axis. FIG. 1 shows the proposed lance; FIG. 2 is a section A-A in FIG. The pipework contains concentrically arranged pipes 1, 2, 3 forming gas supply paths 4, supply and removal of cooler 5, head 6 with nozzles 7. In the head. A rotor 8c is installed with screw grooves 9 in its body 9. The base of the rotor 8 faces the heated 7. The rotor is mounted on semi-axes x 10 and 11. The top semi-axle 10 is fastened in, along sliding clamp 12, rigidly fixed by means of a slatted strap 13 in the gas supply path and bottom 11 in the bearing of the head housing. The tuyere works in the following way. When gas is supplied to the internal cavity of the tuyere, its flow enters the surface of the screw grooves 9 of the rotor 8. This causes a torque ms. . The use of the proposed device eliminates the vibration of the tuyere and, as shown by tests of the models of tuyeres, reduces the pressure loss by 90% relative to the loss of pressure of the gas flow on the rotor of the prototype. Such a design of the tuyere makes it possible to make the most of the kinetic energy of the outgoing jets during their pulsed flow. The use of the proposed device makes it possible to more than 2 times reduce dust formation during the rapid formation of slag and 1.3 to 1.5 times less FeO content in it, which increases the yield. Claim 1. Purge for purging liquid metal containing concentrically arranged pipes forming paths for gas supply, supply and removal of a cooler, a head with nozzles in which a rotor with at least one gas flow guide is installed. you and s. In order to increase the efficiency of purging by reducing gas flow losses, the rotor is made in the form of a cone, the base of which is facing the nozzles, and the direction of the gas flow is. in the form of a screw groove.

2. A flange according to Claim 1, about t and ch ayu with the fact that with an even number of nozzles in the head, the rotor is made with two screw grooves symmetrically located relative to the rotor axis. Sources of information taken into account at. Examination 1. USSR author's certificate number 414313, cl. C 21 C 5/48, .1972,

2. Authors certificate of the USSR 298659, cl. C 21 C 5/48, 1968.

12. Sch