SU1204522A1 - Device for feeding granular materials to steel melt - Google Patents

Description

The invention relates to metallurgy and is intended for the smelting of steel, mainly in an electric arc furnace, with the supply of granular materials to the steel melt through a pipeline.

The purpose of the invention is to increase the life of the pipeline.

The drawing shows a device for supplying granular materials to the steel melt, a general view.

The device comprises a pipeline 1 for supplying granular materials 2 through the lance 3 to the steel melt 4 and a hopper 6 with an outlet opening 7 located above its loading opening 5. In series between the hopper 6 and the pipeline 1, the chambers mounted along the height are arranged

8 and 9. The upper chamber 8 is equipped with nozzles 10, which are directed under the outlet 7 of the bunker 6, and the lower chamber

9 equipped with nozzles 11, which are directed to the loading opening 5 of the pipeline 1.

Highway 12 compressed gas is directly connected to pipeline 1, and through pipe 13 to the collector 14. The cavity of the hopper 6 and the collector 14 are connected by nozzles 15.

As granular materials 2, alloying additives, ore, scale, welding slag, deoxidizers like FeSi, FeMn, with a grain size of 1-5 mm are used.

The upper nozzles 10 are designed to reduce the rate of falling of granular materials 2, ensure their spreading (due to the fact that they are directed under the outlet 7) and spray the granular materials 2 with aerosols of adhesive liquid such as: liquid glue, used machine oil, molasses, epoxy, carbamide and furan resins.

The bottom nozzles 11 serve to blow the granular materials 2 with pulverized material, concentrate the concentrated flow of granular materials 2 and feed them into the inlet 5 of the pipeline 1. The typical materials for steelmaking are lime, natural or synthetic graphite, coke, wood. coal hydrofluoric platform. The particle size of pulverized material is up to 0.05 mm.

For supplying aerosols of liquid, pulverized material and transportation of granular materials 2 via pipeline 1

Make up; ) V. Samsonov

Editor N. Kishtulintstehred I. VeresKorrektor S. Cherni

Order 8478/20 Tnrazh-8E5Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-Zb, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

compressed gas is used, for which argon, nitrogen, and air are used.

The arrows indicate the direction of movement of the liquid aerosols through the upper nozzles 10, pulverized material through the lower nozzles 11, compressed gas through the main 12 and granular materials 2 through pipeline 1.

Example. To deactivate 35L liquid steel, the 40-ton open-hearth furnace from bunker 6 through chambers 8 and 9, pipeline 1 and lance 3 serves 75 ° / oh FeSi of grain composition 1-4 mm in an amount of 180 kg. The lower end of the tuyere 3 is immersed in the melt 4 to 300 mm.

During the feeding process, FeSi particles are sprayed with sprays of used engine oil from the upper nozzles 10, and then blown with powdered coke with a particle size of up to 0.04 mm from the lower nozzles 11, whereby a two-layer casing is formed at each FeSi particle: the film of used engine oil is covered outer layer of powdered coke. Under the blown in during: 5, the action of the pulverized coke stream granular FeSi in the two-layer shell enters the pipeline 1, is picked up by compressed air coming from the highway 12, and is directed through the lance 3 into the melt 4 of steel. Passing through pipeline 1, the grainy FeSi does not have an abrasive effect on it. In the process of moving a two-layer shell, some grains of FeSi produce a coating of the inner surface of pipeline 1, and other grains of FeSi smear this coating with its further transfer along the internal surface of pipeline 1.

As a result, the service life of the pipeline 1 and the tuyere 3 increases many times. From the line 12, the compressed air is also directed through the tube 13, the collector 14 and the nozzles 15 into the cavity of the hopper 6, where it prevents the coalescence of granular FeSi and ensures its uniform supply to the loading opening of the pipeline 1.

Having done useful work to protect against abrasive wear, used engine oil and pulverized coke enter the steel melt as substances that can compensate carbon loss. This makes it possible to reduce the share of pig iron in the filling, which is significantly more expensive than scrap metal.

The device allows to extend the service life of the pipeline 12 times.

Claims (1)

DEVICE FOR SUBMITTING GRAIN MATERIALS TO MELT OF STEEL, containing a transport pipeline, hopper feeder and nozzles for steel ”(72) V. I. Kovalenko and N. A. Sharpan (53) 669.184.144.8 (088.8) (56) USSR Copyright Certificate No. 861242, cl. In 65 G 53/52, 1979. USSR copyright certificate No. 653191, cl. B 65 G 53/50, 1977. USSR copyright certificate No. 104578, cl. С 21 С 7/00, 1982. powder inlet and outlet, characterized in that, in order to increase the service life of the pipeline, the hopper feeder is additionally equipped with two chambers located between the feeder and the pipeline, equipped with nozzles directed obliquely towards the outlet of the feeder and loading opening of the pipeline.