Blast furnace operation method and lance

Patent metadata

Field	Value
Publication number	US-9945001-B2
Application number	US-201414781698-A
Country	US
Kind code	B2
Filing date	Mar 27, 2014
Priority date	Apr 3, 2013
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A method is provided for operating a blast furnace by blowing a solid reducing material, a flammable gaseous reducing material and a combustible gas into a blast furnace from tuyeres through a lance into a blast furnace, wherein a parallel type lance prepared by bundling three independent blowing tubes in parallel and integrally housing them into an outer tube is used, and either one or both of the gaseous reducing material and the combustible gas and the solid reducing material are simultaneously blown through the respective blowing tubes, while the blowing tube for the solid reducing material and the blowing tube for the gaseous reducing material are positioned above the blowing tube for the combustible gas in the blowing through the parallel type lance as well as a lance structure thereof.

First claim

The invention claimed is:

1. A method of operating a blast furnace by blowing a solid reducing material, a gaseous reducing material and a combustible gas into a blast furnace from tuyeres through a lance into a blast furnace, wherein a parallel lance prepared by bundling three independent blowing tubes arranged adjacent to each other and in parallel to each other, and integrally housing the three independent blowing tubes into an outer tube for the lance is used, and either one or both of the gaseous reducing material and the combustible gas are simultaneously blown with the solid reducing material through the respective blowing tubes, wherein the blowing tube for the solid reducing material and the blowing tube for the gaseous reducing material are positioned above the blowing tube for the combustible gas in the blowing through the parallel lance.

2. The method of operating a blast furnace according to claim 1 , wherein the blowing tube for solid reducing material, the blowing tube for gaseous reducing material and the blowing tube for combustible gas in the parallel lance are arranged so that an angle of a face passing an outer contact point between a center of the blowing tube for solid reducing material and the outer tube for lance to a radially vertical plane of the lance inserted into a blowpipe is within ±90°.

3. A lance for blowing a solid reducing material, a gaseous reducing material and a combustible gas through tuyeres into a blast furnace in accordance with the method of claim 1 , the lance having a structure that three independent blowing tubes are bundled adjacent to each other and in parallel to each other, and the three independent blowing tubes are integrally housed in an outer tube for lance, wherein the blowing tube for the solid reducing material and the blowing tube for the gaseous reducing material are positioned above the blowing tube for the combustible gas.

4. A lance according to claim 3 , wherein the blowing tubes are arranged so that an angle of a face passing an outer contact point between a center of the blowing tube for solid reducing material and the outer tube for lance to a radially vertical plane of the lance inserted into a blowpipe is within ±90°.

5. A lance according to claim 3 , wherein each of the blowing tubes is a tube having an inner diameter of not less than 6 mm but not more than 30 mm.

6. A lance according to claim 4 , wherein each of the blowing tubes is a tube having an inner diameter of not less than 6 mm but not more than 30 mm.

Assignees

• Jfe Steel Corp

Inventors

• Fujiwara Daiki
• Murao Akinori
• KAJISA Takeshi
• TOKUDOME Mitsushi

Classifications

• F27B1/16

  Arrangements of tuyeres · CPC title

• C21B5/001

  Injecting additional fuel or reducing agents · CPC title

• C21B5/02

  Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals · CPC title

• C21B7/163 Primary

  Blowpipe assembly · CPC title

• C21B7/16

  Tuyéres · CPC title