Lance and operation method using the same

Patent metadata

Field	Value
Publication number	US-2015344982-A1
Application number	US-201314653376-A
Country	US
Kind code	A1
Filing date	Dec 16, 2013
Priority date	Dec 18, 2012
Publication date	Dec 3, 2015
Grant date	—

Abstract

Provided is a lance and an operation method using the same, in which a suction hole allowing source gas to be injected into a container, in which a reaction gas is generated, is included. The suction hole is formed in a source gas passage where the reaction gas is introduced into the passage. Thus the temperature of the gas injected into the container may be easily increased without using any separate heating device, and secondary combustion efficiency may be increased. In addition, the gas sprayed at a high temperature is provided, and thus additional heat may be supplied into the container. Thus, excessive use of fuel used to increase the temperature of the container may be avoided, and thus operation costs may be reduced and operation efficiency and productivity may be increased.

First claim

1 . A lance for blowing a source gas into a container in which a reaction gas is generated, the lance comprising a suction hole formed at a gas passage, and configured to introduce the reaction gas into the passage.

2 . The lance of claim 1 , wherein
a wall body formed to extend vertically, and configured to separate the outside and the passage; a storage part disposed over the suction hole, and configured to accommodate the source gas; a mixing part disposed under the suction hole, and configured to mix the source gas and the reaction gas therein; and a discharge part formed under the mixing part to extend a predetermined distance, and configured to discharge the gas into the container.

3 . The lance of claim 2 , wherein the storage part is gradually narrowed toward the suction hole.

4 . The lance of claim 3 , wherein
a discharge hole configured to discharge the source gas to the mixing part is formed at an end of the storage part, and the suction hole penetrating through the wall body to allow the passage to communicate with the outside.

5 . The lance of claim 4 , wherein the discharge hole comprises
an introduction end through which the source gas is introduced and a discharge end facing the introduction end, the discharge hole being gradually broadened from the introduction end toward the discharge end.

6 . The lance of claim 2 , wherein the mixing part is gradually narrowed toward the discharge part.

7 . The lance of claim 2 , wherein an end of the discharge part is gradually broadened in a downward direction.

8 . The lance of claim 4 , wherein the suction hole is formed to be inclined toward the inside of the wall part.

9 . An operation method for refining molten iron, the operation method comprising:
preparing molten iron in a container; lowering a lance into the container to position the lance over the molten iron; supplying an oxidative gas to the lance to spray the oxidative gas to the molten iron; and introducing, into the lance, a reaction gas generated by the oxidative gas that is sprayed to the molten iron.

10 . The operation method of claim 9 , further comprising introducing the reaction gas into the lance, and mixing the introduced reaction gas and the oxidative gas.

11 . The operation method of claim 10 , further comprising mixing the reaction gas and the oxidative gas and spraying the mixed gas into the container.

12 . The operation method of claim 9 , wherein the reaction gas is CO gas.

13 . The operation method of claim 10 , wherein the reaction gas is CO gas.

14 . The operation method of claim 11 , wherein the reaction gas is CO gas.

Assignees

• Posco

Inventors

• Ha Chang Su
• Choi Hyeon Soo

Classifications

• F27D2003/163

  the fluid being an oxidant · CPC title

• F27D2003/169

  Construction of the lance, e.g. lances for injecting particles · CPC title

• F27D3/16

  Introducing a fluid jet or current into the charge (F27D3/18 takes precedence) · CPC title

• C21C5/4606 Primary

  Lances or injectors · CPC title

• C21C5/305

  Afterburning · CPC title