Plant combination for producing steel and method for operating the plant combination

Patent metadata

Field	Value
Publication number	US-2016348195-A1
Application number	US-201415102418-A
Country	US
Kind code	A1
Filing date	Dec 11, 2014
Priority date	Dec 12, 2013
Publication date	Dec 1, 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, a gas-conducting system for gases that occur in the production of pig iron and/or in the production of crude steel, and a power-generating plant for electricity generation. The power-generating plant is operated with a gas that comprises at least a partial amount of the blast-furnace top gas that occurs in the production of pig iron and/or a partial amount of the converter gas. According to the invention, a chemical or biotechnological plant is provided and connected to the gas-conducting system and arranged in parallel with the power-generating plant with respect to the gas supply. Externally obtained electricity and power-generating plant electricity are used to cover the electricity demand of the plant complex.

First claim

1 .- 18 . (canceled)

19 . A plant complex for the production of steel, comprising:
a blast furnace for producing pig iron; a converter steel mill for producing crude steel; a gas-conducting system for gases that occur in the production of pig iron and/or the production of crude steel; a power-generating plant for electricity generation; and a chemical or biotechnology plant; wherein:
the power-generating plant is designed as a gas-turbine power-generating plant or gas-turbine and steam-turbine power-generating plant′
the power-generating plant is operated with a gas that comprises at least a partial amount of blast-furnace top gas that occurs in the production of pig iron in the blast furnace and/or a partial amount of the converter gas that occurs in the converter steel mill;
the chemical or biotechnological plant is connected to the gas-conducting system and arranged in parallel with the power-generating plant ( 3 ) with respect to the gas supply; and
the gas-conducting system comprises an operationally controllable gas diverter for dividing the streams of gas that are fed to the power-generating plant and the chemical or biotechnological plant.

20 . The plant complex according to claim 19 , wherein the plant complex additionally comprises a coke-oven plant, and wherein the gas-conducting system includes a gas distribution for coke-oven gas that occurs in a coking process in the coke-oven plant.

21 . The plant complex according to claim 19 , wherein the gas-conducting system includes, upstream of the gas diverter in the direction of flow, a mixing device for producing a mixed gas comprising at least one of blast-furnace top gas, converter gas, and coke-oven gas, and wherein the streams of gas that are fed to the power-generating plant and the chemical or biotechnological plant can be controlled by means of the gas diverter.

22 . The plant complex according to one of claim 19 , wherein the plant complex additionally has a plant for producing hydrogen, which is connected to the gas-conducting system by a hydrogen-carrying line.

23 . The plant complex according to claim 22 , wherein the plant for producing hydrogen is an electrolysis plant for the electrolysis of water.

24 . A method for operating a plant complex comprising a blast furnace for producing pig iron, a converter steel mill, a power-generating plant, and a chemical plant or biotechnological plant, the method comprising:
a) using at least one of a partial amount of the blast-furnace top gas that occurs in the production of pig iron in the blast furnace and a partial amount of the converter gas that occurs in the production of crude steel as a useful gas for operating the power-generating plant and the chemical plant or biotechnological plant; b) using externally obtained electricity and power-generating plant electricity, which is produced by the power-generating plant of the plant complex, to cover the electricity demand of the plant complex; c) determining a variable process parameter, wherein the process parameter is dependent on the proportion of electricity accounted for by the externally obtained electricity with respect to the overall electricity demand of the plant complex; d) determining the amount of useful gas fed to the power-generating process based on the process parameter determined in step (c); and e) using the part of the useful gas that is not used for electricity generation, after a gas-conditioning operation:
e1) as a syngas for producing chemical products; or
e2) by the biotechnological plant for biochemical processes, wherein the part of the useful gas is fed to the biotechnological plant.

25 . The method according to claim 24 , wherein:
the plant complex additionally comprises a coke-oven plant; at least one of a partial amount of the blast-furnace top gas that occurs in the production of pig iron and a partial amount of the converter gas that occurs in the converter steel works is mixed with a partial amount of the coke-oven gas that occurs in the coke-oven plant; and the mixed gas is used as a useful gas.

26 . The method according to claim 25 , wherein:
blast-furnace top gas and converter gas are mixed; a syngas is produced from the mixed gas after a gas-conditioning operation; and conditioned coke-oven gas is admixed with the syngas or the cleaned mixed gas before the further processing to form the syngas.

27 . The method according to claim 26 , wherein a syngas is produced from blast-furnace top gas after a gas-conditioning operation; and wherein conditioned coke-oven gas is additionally admixed with the syngas or the cleaned blast-furnace top gas before the further processing to form the syngas.

28 . The method according to claim 26 , wherein a syngas is produced from converter gas after a gas-conditioning operation; and wherein conditioned coke-oven gas is additionally admixed with the syngas or the cleaned converter gas before the further processing to form the syngas.

29 . The method according to claim 25 , wherein the externally obtained electricity is at least partially obtained from renewable energy.

30 . The method according to claim 25 , wherein the determination of the process parameter depends on a function that includes the price for the externally obtained electricity and the costs for producing the power-generating plant electricity as variables.

31 . The method according to claim 30 , wherein the power output of the power-generating plant is controlled between 20% and 100%, in dependence on the amount of useful gas fed to the power-generating process.

32 . The method according to claim 24 , wherein a gas-turbine power-generating plant or a gas-turbine and steam-turbine power-generating plant is used as the power-generating plant.

33 . The method according to claim 24 , wherein the power output of the chemical plant or of the biotechnological plant is controlled in dependence on the amount of mixed gas fed to this plant.

34 . The method according to claim 33 , wherein the chemical plant has a plurality of small units arranged in parallel, which are individually switched on or off depending on the available stream of useful gas.

35 . A method for operating a plant complex comprising a chemical plant coupled to a metallurgical plant, the metallurgical plant comprising a blast furnace for producing pig iron, a converter steel mill, and a coke-oven plant, the method comprising:
feeding, as a useful gas, at least a partial amount of at least one of a blast-furnace top gas that occurs in the production of pig iron, a converter gas that occurs in the converter steel mill, and a coke-oven gas that is drawn off from the coke-oven plant, to the chemical plant for producing chemical products.

36 . A method for operating a plant complex comprising a biotechnological plant coupled to a metallurgical plant, the metallurgical plant comprising at least one blast furnace for producing pig iron, a converter steel mill, and a coke-oven plant, the method comprising:
feeding a partial amount of at least one of a blast-furnace top gas that occurs in the production of pig iron, a converter gas that occurs in the converter steel mill, and a coke-oven gas that is drawn off from the coke-oven plant to a biotechnological plant for biochemical processes.

Assignees

• Thyssenkrupp Ag

Inventors

• Achatz Reinhold
• Wagner Jens
• Oles Markus
• Schmöle Peter
• Kleinschmidt Ralph
• Kolbe Bärbel
• Krüger Matthias Patrick
• Meissner Christoph

Classifications

• C21B2100/62

  Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production · CPC title

• Y02P10/143

  of methane [CH4] · CPC title

• Y02P20/133

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

• C21B2100/60

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

• C21B7/00

  Blast furnaces · CPC title