Combined system for producing steel and method for operating the combined system

Patent metadata

Field	Value
Publication number	US-2016304978-A1
Application number	US-201415102142-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Dec 12, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

The invention relates to a plant complex for steel production comprising a blast furnace for producing pig iron, a converter steel mill for producing crude steel and a gas-conducting system for gases that occur in the production of pig iron and/or in the production of crude steel. According to the invention, the plant complex additionally has a chemical or biotechnological plant connected to the gas-conducting system and a plant for producing hydrogen. The plant for producing hydrogen is connected to the gas-conducting system by a hydrogen-carrying line. Also the subject of the invention is a method for operating the plant complex.

First claim

1 .- 18 . (canceled)

19 . A plant complex for steel production comprising
a blast furnace for producing pig iron; a converter steel mill for producing crude steel; a chemical plant or a biotechnological plant; a hydrogen producing plant; a power-generating plant; and a gas-conducting system for gases that occur in the production of pig iron and/or the production of crude steel; wherein:
the chemical plant or biotechnological plant is connected to the gas-conducting system and the plant for producing hydrogen;
the hydrogen-producing plant is connected to the gas-conducting system via a hydrogen carrying line;
the power-generating plant is designed as a gas-turbine power-generating plant or a gas-turbine and steam-turbine power-generating plant and is operated with a gas comprising at least a partial amount of one of blast furnace top gas occurring in the production of pig iron in the blast furnace and converter gas that occurs in the converter steel mill; and
the gas-conducting system comprises a connectable gas diverter for dividing the streams of gas that are fed to the power-generating plant and the chemical plant or biotechnological plant.

20 . The plant complex according to claim 19 , wherein the hydrogen-carrying line is connected to a mixing device and is arranged upstream of the chemical or biotechnological plant relative to the direction of flow, and wherein a stream of gas which is fed to the mixing device is enriched with hydrogen.

21 . The plant complex according to claim 19 , wherein the chemical plant or biotechnological plant is connected to a line for converter gas, and wherein the hydrogen-carrying line is connected to the converter-gas line, so that the converter gas, for use in the chemical plant or biotechnological plant, can be enriched with hydrogen.

22 . The plant complex according to one of claim 19 , wherein the plant for producing hydrogen has an electrolysis plant for the electrolysis of water.

23 . The plant complex according to claim 22 , wherein the electrolysis plant is connected to at least one of the blast furnace and to a plant for producing crude steel by means of an oxygen-return device.

24 . A method for operating a plant complex having a blast furnace for producing pig iron, a converter steel mill, a chemical plant or biotechnological plant and a plant for producing hydrogen, comprising utilizing at least a partial amount of at least one of blast-furnace top gas that occurs in the production of pig iron in the blast furnace and a converter gas that occurs in the production of crude steel, after a gas-conditioning operation, as a useful gas for producing chemical products;
wherein:
the useful gas, prior to being used as syngas, is enriched with hydrogen formed in the hydrogen-producing plant;
a part of the useful gas is fed to a power-generating plant and used for electricity generation;
the power-generating plant and the chemical or biotechnological plant are connected in parallel; and
the streams of gas that are fed to the power-generating plant, on the one hand, and to the chemical or biotechnological plant, on the other hand, are controlled.

25 . The method according to claim 24 , wherein the syngas is produced from converter gas and is enriched with hydrogen.

26 . The method according to claim 24 , wherein blast-furnace top gas and converter gas are used to produce a mixed gas which, after a gas-conditioning operation and enrichment with hydrogen, is used as syngas for producing chemical products or in the biotechnological plant for biochemical processes.

27 . The method according to claim 24 , wherein the hydrogen is produced by electrolysis of water.

28 . The method according to claim 27 , wherein the electrolysis of water is operated by electric power which has been produced from renewable energy.

29 . The method according to claim 27 , wherein the oxygen formed during the electrolysis of water is used within at least one of the blast furnace for producing pig iron and the converter steel mill for producing crude steel.

30 . The method according to claim 24 , wherein the amount of H 2 produced is such that the entire fraction of carbon and nitrogen in the useful gas can be used for converting into chemical products.

31 . The method according to claim 24 , characterized in that 5% to 60% of the amount of gas that occurs as blast-furnace top gas during the production of pig iron and/or as converter gas in the converter steel mill is fed to the chemical or biotechnological plant and used for producing chemical products.

32 . The method according to claim 24 , wherein coke-oven gas is admixed with the useful gas.

33 . The method according to claim 24 , wherein the output of the power-generating plant is reduced to part-load or base-load operation, and the stream of gas fed to the power-generating plant is restricted correspondingly, if the electricity price for electrical energy obtained from renewable energy is lower than the costs of the power produced in the power-generating plant.

34 . A plant complex, comprising:
a chemical or biotechnological plant and a plant for producing hydrogen coupled to a metallurgical plant, the metallurgical plant comprising:
a least one blast furnace for producing pig iron; and
an iron steel mill;
wherein a partial amount of at least one of blast furnace top gas that occurs in the production of pig iron and converter gas that occurs in the converter steel mill is fed to the chemical or biotechnological plant, and after a gas-conditioning operation and enrichment with hydrogen, is used as syngas for producing chemical products.

Assignees

• Thyssenkrupp Ag
• Thyssenkrupp Ind Solutions Ag
• Thyssenkrupp Steel Europe Ag

Inventors

• Achatz Reinhold
• Wagner Jens
• Oles Markus
• Schmöle Peter
• Kleinschmidt Ralph
• Krüger Matthias Patrick
• Krotov Denis
• Von Morstein Olaf

Classifications

• F01L15/10

  with main slide valve and auxiliary valve dragged thereby · CPC title

• Y02P20/133

  Renewable energy sources, e.g. sunlight · CPC title

• C21B5/06 Primary

  using top gas in the blast furnace process · CPC title

• Y02P10/143

  of methane [CH4] · CPC title

• C21B2100/60

  Process control or energy utilisation in the manufacture of iron or steel · CPC title