Method for operation of blast furnace

Patent metadata

Field	Value
Publication number	US-2016326604-A1
Application number	US-201515110073-A
Country	US
Kind code	A1
Filing date	Jan 6, 2015
Priority date	Jan 7, 2014
Publication date	Nov 10, 2016
Grant date	—

Abstract

A method for operation of a blast furnace able to greatly reduce the CO 2 emission and enabling stable production of pig iron over a long period of time in a commercial blast furnace, that is, a method for operation of a blast furnace in which iron ore and coke are charged from a furnace top and is blown in pulverized coal from a usual tuyere, comprising blowing in a gas containing at least one of hydrogen and hydrocarbon from the usual tuyere together with the pulverized coal and blowing a gas comprised of a top gas of the blast furnace from which carbon dioxide and steam is removed from a shaft tuyere into the blast furnace.

First claim

1 - 8 . (canceled)

9 . A method for operation of a blast furnace in which iron ore and coke are charged from a furnace top and pulverized coal is injected from a usual tuyere, comprising
blowing a blast containing at least one of hydrogen and hydrocarbon from said usual tuyere together with said pulverized coal, blowing a gas comprised of a top gas of the blast furnace from which carbon dioxide and steam are removed from a shaft tuyere into the blast furnace, and blowing said top gas from the usual tuyere without heating and raising an oxygen enrichment of gas blown from the usual tuyere.

10 . The method for operation of a blast furnace according to claim 9 , further comprising blowing blast comprised of top gas of the blast furnace from which carbon dioxide and steam are removed from the usual tuyere into the blast furnace.

11 . The method for operation of a blast furnace according to claim 9 , wherein said blast from the usual tuyere is enriched with oxygen by an oxygen enrichment of 10% not less than and not more than by a Y % shown in the following formula:
Y= 0.079×CH 4 +32

wherein CH 4 indicates a vol % of methane in gas blown in from the usual tuyere.

12 . The method for operation of a blast furnace according to claim 9 , wherein a blowing rate of said gas containing at least one of hydrogen and hydrocarbon is 30 Nm 3 /tHM or more.

13 . The method for operation of a blast furnace according to claim 9 , wherein said top gas blown from the shaft tuyere is blown from said shaft tuyere by a blowing rate of 400 Nm 3 /tHM or less at a temperature of 600° C. to 1000° C.

14 . The method for operation of a blast furnace according to claim 9 , wherein the blowing rate of the top gas blown from said shaft tuyere is 100 Nm 3 /tHM or more.

15 . The method for operation of a blast furnace according to claim 9 , wherein said gas containing at least one of hydrogen and hydrocarbon blown from said usual tuyere contains methane.

16 . The method for operation of a blast furnace according to claim 15 , wherein said gas containing methane includes at least one of coke oven gas and natural gas.

17 . The method for operation of a blast furnace according to claim 10 , wherein said blast from the usual tuyere is enriched with oxygen by an oxygen enrichment of 10% not less than and not more than by a Y % shown in the following formula:
Y= 0.079×CH 4 +32

wherein CH 4 indicates a vol % of methane in gas blown in from the usual tuyere.

18 . The method for operation of a blast furnace according to claim 10 , wherein a blowing rate of said gas containing at least one of hydrogen and hydrocarbon is 30 Nm 3 /tHM or more.

19 . The method for operation of a blast furnace according to claim 11 , wherein a blowing rate of said gas containing at least one of hydrogen and hydrocarbon is 30 Nm 3 /tHM or more.

20 . The method for operation of a blast furnace according to claim 10 , wherein said top gas blown from the shaft tuyere is blown from said shaft tuyere by a blowing rate of 400 Nm 3 /tHM or less at a temperature of 600° C. to 1000° C.

21 . The method for operation of a blast furnace according to claim 11 , wherein said top gas blown from the shaft tuyere is blown from said shaft tuyere by a blowing rate of 400 Nm 3 /tHM or less at a temperature of 600° C. to 1000° C.

22 . The method for operation of a blast furnace according to claim 12 , wherein said top gas blown from the shaft tuyere is blown from said shaft tuyere by a blowing rate of 400 Nm 3 /tHM or less at a temperature of 600° C. to 1000° C.

23 . The method for operation of a blast furnace according to claim 10 , wherein the blowing rate of the top gas blown from said shaft tuyere is 100 Nm 3 /tHM or more.

24 . The method for operation of a blast furnace according to claim 11 , wherein the blowing rate of the top gas blown from said shaft tuyere is 100 Nm 3 /tHM or more.

25 . The method for operation of a blast furnace according to claim 12 , wherein the blowing rate of the top gas blown from said shaft tuyere is 100 Nm 3 /tHM or more.

26 . The method for operation of a blast furnace according to claim 13 , wherein the blowing rate of the top gas blown from said shaft tuyere is 100 Nm 3 /tHM or more.

27 . The method for operation of a blast furnace according to claim 10 , wherein said gas containing at least one of hydrogen and hydrocarbon blown from said usual tuyere contains methane.

28 . The method for operation of a blast furnace according to claim 11 , wherein said gas containing at least one of hydrogen and hydrocarbon blown from said usual tuyere contains methane.

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Jfe Steel Corp
• Kobe Steel Ltd
• Nisshin Steel Co Ltd
• Nippon Steel & Sumikin Eng Co

Inventors

• Inada Takanobu
• Sakai Hiroshi
• Ujisawa Yutaka

Classifications

• C21B5/003 Primary

  Injection of pulverulent coal · CPC title

• C21B7/002

  Evacuating and treating of exhaust gases · CPC title

• C21B5/06 Primary

  using top gas in the blast furnace process · CPC title

• C21B7/16

  Tuyéres · CPC title

• C21B2100/02

  Chemistry & Metallurgy · mapped topic