Smelting assembly for the production of steel

Patent metadata

Field	Value
Publication number	US-2021040573-A1
Application number	US-201916978378-A
Country	US
Kind code	A1
Filing date	Mar 5, 2019
Priority date	Mar 6, 2018
Publication date	Feb 11, 2021
Grant date	—

Abstract

An improved apparatus for producing steel, including a lower furnace, an annular, water-cooled, fireproof lined cylindrical upper furnace, on which an upwardly closing conically tapering hat having openings can be placed. The smelting assembly is configured for the operational mode without melt flow and the operational mode with melt flow. To this end, at least one opening is provided in the conical furnace cover, through which opening at least one top lance can be introduced into the upper furnace. A plurality of sidewall injectors radially rotate around the cylindrical upper furnace in such a way that in a working position, the top lance and the sidewall injectors are directed onto a smelt level of a molten mass located in the lower furnace for refining.

First claim

1 - 7 . (canceled)

8 . A smelting assembly for production of steel, comprising: having a fireproof-cladded lower furnace/hearth part with bottom tapping; a substantially cylindrical, water-cooled, upper furnace; a conical furnace cover placeable onto the upper furnace, wherein the conical cover has an exhaust gas port, wherein the smelting assembly is configured for a running mode without a smelting current as well as for a running mode with a smelting current, wherein the running mode of the smelting assembly is variable by changing the furnace cover, wherein the conical furnace cover for the running mode without a smelting current has at least one opening through which at least one top lance for injecting a process gas is introducible into the upper furnace, and the conical furnace cover for the running mode with a smelting current has at least one opening through which at least one graphite electrode is introducible into the upper furnace; and a plurality of lateral wall injectors are arranged spaced in the cylindrical upper furnace so as to be radially encircling so that the top lance and the lateral wall injectors in an operating position are aligned toward a melt level of a melt which for oxidizing is situated in the lower furnace/hearth part.

9 . The smelting assembly for production of steel according to claim 8 , wherein the top lance and the lateral wall injectors are configured to operate simultaneously and with mutually adapted volumetric flows in a coordinated manner so as to suppress intense melt slag splashes and avoid a formation of skull on the smelting assembly.

10 . The smelting assembly for production of steel according to claim 8 , wherein for the running mode with a smelting current, in which various mixtures of metallurgical ingredients are present in the smelting assembly, the furnace cover is convertible so that the at least one graphite electrode is introducible into the lower furnace/hearth part.

11 . The smelting assembly for production of steel according to claim 10 , wherein for the running mode with a smelting current, the furnace cover is configured so that a maximum of three graphite electrodes are able to be introduced through the openings of the furnace cover.

12 . The smelting assembly for production of steel according to claim 8 , wherein the lateral wall injectors and the top lance are configured so that between 10% and 50% of a gas required for oxidizing is injectable through the lateral wall injectors and 90% to 50% of the gas is injectable through the top lance into the melt situated in the smelting assembly, said injections taking place simultaneously and in a mutually adapted manner.

13 . The smelting assembly for production of steel according to claim 12 , wherein the top lance and the lateral wall injectors are configured to provide an optimal mixing ratio between the top lance and the lateral wall injectors so that melt and slag splashes are reduced and a formation of skull in the upper furnace is minimized.

14 . The smelting assembly for production of steel according to claim 8 , further comprising a specially shaped furnace manifold assigned to the furnace cover, the furnace manifold being configured so as to be inclined and have a cross section adapted to process conditions so that a maximum flow rate of exhaust gas created during oxidizing does not exceed 50 m/s.

Assignees

• Sms Group Gmbh

Inventors

• Starke Peter
• Schüring Andreas
• Henkel Thomas
• Odenthal Hans-Jürgen

Classifications

• F27D17/302

  Constructional details of ancillary components, e.g. waste gas conduits or seals · CPC title

• C21C5/5217 Primary

  equipped with burners or devices for injecting gas, i.e. oxygen, or pulverulent materials into the furnace · CPC title

• F27B3/225 Primary

  Oxygen blowing · CPC title

• C21C5/52

  Manufacture of steel in electric furnaces {(C21C5/005 takes precedence)} · CPC title

• F27B3/085

  Arc furnaces · CPC title