Method for generating synthesis gas in conjunction with a smelting works

Patent metadata

Field	Value
Publication number	US-10697032-B2
Application number	US-201415103143-A
Country	US
Kind code	B2
Filing date	Dec 11, 2014
Priority date	Dec 12, 2013
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The invention relates to a method for producing syngas in combined operation with a metallurgical plant which comprises at least one blast furnace for producing crude iron, a converter steel mill and a coke-oven plant. Part of the blast-furnace top gas that is produced in the production of crude iron and/or part of the converter gas that occurs in the converter steel mill and/or part of the coke-oven gas that is produced in the coke-oven plant are mixed. By choosing the gas streams that are brought together to form a mixed gas and/or by changing the mixing ratios of the gas streams that are brought together, at least two streams of useful gas are produced, differing with regard to their composition and respectively prepared to form streams of syngas.

First claim

The invention claimed is:

1. A method for producing syngas in combined operation with a metallurgical plant which comprises at least one blast furnace for producing crude iron, a converter steel mill, and a coke-oven plant, the method comprising:
forming a mixed stream of gas by mixing a part of at least two items selected from the group consisting of: a blast-furnace top gas produced in the production of crude iron, a converter gas that occurs in the converter steel mill, and a coke-oven gas produced in the coke-oven plant;
forming a second stream of gas, wherein the second stream of gas comprises converter gas that occurs in the converter steel mill, blast-furnace top gas produced in the production of crude iron, or a mixture of blast-furnace top gas produced in the production of crude iron and converter gas that occurs in the converter steel mill;
producing a first stream of useful gas from the mixed stream of gas by selectively choosing the gas streams that are brought together to form the mixed stream of gas, or by changing the mixing ratios of the gas streams that are brought together to form the mixed stream of gas, wherein the first stream of useful gas contains H 2 ;
producing a second stream of useful gas from the second stream of gas by selectively choosing the gas stream that forms the second stream of gas, wherein the second stream of useful gas contains CO as the main constituent and about 2% H 2 by volume;
producing from the first stream of useful gas, by gas conditioning, a first syngas containing (1) CO and H 2 ; or (2) N 2 and H 2 as the main constituents;
producing a first chemical product from the first syngas, the first stream of useful gas, the second stream of useful gas, or a combination of the first stream of useful gas and the second stream of useful gas; and
producing a second chemical product from the first syngas, the first stream of useful gas, the second stream of useful gas, or a combination of the first stream of useful gas and the second stream of useful gas;
wherein:
the first and second streams of useful gas differ with regards to their respective compositions; and
the first chemical product is different from the second chemical product.

2. The method according to claim 1 , wherein preparation of the streams of useful gas further comprises a gas-cleaning operation.

3. The method according to claim 2 , wherein at least one of a steam-reforming operation with water vapour, a partial oxidation with air or oxygen, and a water-gas-shift reaction is used for the gas conditioning.

4. The method according to claim 1 , wherein the coke-oven gas and the blast-furnace top gas is cleaned before being used as useful gas, the cleaning having the effect of removing carbon black, high-boiling hydrocarbons, aromatic hydrocarbons, sulfur and sulfur compounds.

5. The method according to claim 1 , wherein the streams of useful gas are cleaned before the gas conditioning operation, the cleaning having the effect of removing carbon black, high-boiling hydrocarbons, aromatic hydrocarbons, sulfur and sulfur compounds.

6. The method according to claim 1 , wherein the hydrogen content of at least one stream of useful gas is set by separating out hydrogen by means of a pressure swing adsorption plant or by enriching with hydrogen.

7. The method according to claim 1 , wherein at least one of the streams of useful gas is enriched with hydrogen that is produced in the metallurgical plant by electrolysis of water.

8. The method according to claim 7 , wherein the hydrogen content of at least one stream of useful gas is set by reforming CH 4 .

9. The method according to claim 1 , wherein the hydrogen content of at least one stream of useful gas is set by converting CO in a water-gas-shift reaction.

10. The method according to claim 1 , wherein the first mixed stream of gas comprises blast-furnace top gas and converter gas.

11. The method according to claim 10 , wherein the second stream of gas comprises coke-oven gas.

12. A method for producing syngas in combined operation with a metallurgical plant which comprises at least one blast furnace for producing crude iron, a converter steel mill, and a coke-oven plant, the method comprising:
forming a first stream of useful gas comprising at least one of: a blast-furnace top gas produced in the production of crude iron, a converter gas that occurs in the converter steel mill, and a coke-oven gas produced in the coke-oven plant; wherein the first stream of useful gas contains H 2 ;
forming a second stream of useful gas comprising a converter gas that occurs in the converter steel mill, or a mixture of blast-furnace top gas produced in the production of crude iron and converter gas that occurs in the converter steel mill; wherein the second stream of useful gas contains CO as the main constituent and about 2% H 2 by volume;
producing from the first stream of useful gas, by gas conditioning, a first syngas containing (1) CO and H 2 ; or (2) N 2 and H 2 as the main constituents;
producing a first chemical product from the first syngas; and
producing a second chemical product from the second stream of useful gas; wherein:
the first and second streams of useful gas differ with regards to their respective compositions; and
the chemical product from the first syngas is different from the chemical product from the second stream of useful gas.

Assignees

• Thyssenkrupp Ag

Inventors

• Achatz Reinhold
• Wagner Jens
• Oles Markus
• Schmöle Peter
• Kleinschmidt Ralph
• Krotov Denis
• Von Morstein Olaf
• Büker Karsten

Classifications

• Y02P10/25

  Process efficiency · CPC title

• Y02P10/143

  of methane [CH4] · CPC title

• C25B1/044

  producing mixed hydrogen and oxygen gas, e.g. Brown's gas [HHO] · CPC title

• C21C5/38

  Removal of waste gases or dust · CPC title

• C21B2100/24

  by shift reactions · CPC title