Method of charging metal carriers to a melt-down gasifying zone

• US 6,258,148 B1
• Filed: 12/30/1998
• Issued: 07/10/2001
• Est. Priority Date: 07/11/1996
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation), Pohang Iron & Steel Company Limited (Posco), Research Institute of Industrial Science and Technology, Voest-Alpine Industrieanlagenbau GmbH (Voestalpine AG)
• Original Assignee: Pohang Iron & Steel Company Limited (Posco), Research Institute of Industrial Science and Technology, Voest-Alpine Industrieanlagenbau GmbH (Voestalpine AG)
• Inventors: Gennari, Udo, Schenk, Johannes-Leopold
• Primary Examiner(s): Andrews, Melvyn
• Application Number:
  US09/223,372
• Time in Patent Office: 923 Days
• Field of Search: 754/46, 754/92, 755/00, 755/01, 755/02
• US Class Current: 75/446
• CPC Class Codes: C21B 13/002 Reduction of iron ores by passing through a heated column of carbon
• CPC Class Codes: C21B 13/0026 introduction of iron oxide in the flame of a burner or a hot gas stream
• CPC Class Codes: C21B 13/14 Multi-stage processes processes carried out in different vessels or furnaces
• CPC Class Codes: C21B 2100/44 Removing particles, e.g. by scrubbing, dedusting
• CPC Class Codes: Y02P 10/134 by avoiding CO2, e.g. using hydrogen

Abstract

In a method of charging metal carriers which contain a portion of fines and are at least partially reduced to a melter gasifier in which a melt-down gasifying zone formed by a bed is maintained, the metal carriers and carbon carriers are fed into the melter gasifier above the level of the melt-down gasifying zone. The metal carriers descend to the melt-down gasifying zone and travel through the same forming a metal melt and producing a reducing gas by coal gasification. In order to prevent a partial discharge from the melter gasifier of the metal carriers, in particular of the fine particles thereof, when charging the same, feeding of the metal carriers into the interior of the melter gasifier is effected at a vertical distance below a dome (30) terminating the melter gasifier toward the top, gravitationally and under the formation of a strand (44), and the strand (44) is surrounded by a gas jacket (45) enclosing and accompanying the freely falling strand (44) from its level of origin (at 40) onwards over a section (46) of the fall, and in this section (46) the stand (44) is supported against expansion by the gas jacket (45).

Claims

1. A method which comprises:

(a) charging metal carriers to a melter gasifier (10) having a melt-down gasifying zone (11) formed by a bed, said carriers containing;

a portion of fines, and said metal carriers being at least partially reduced;

(b) Feeding the metal carrier and carbon carriers into the melter gasifier (1) above the level of the melt down gasifying zone (11), so that said carriers descend to the melt-down gasifying zone (11) and travel through said zone to form a metal melt;

(c) Producing a reducing gas by coal gasification with supply of oxygen in the lower region of the melter gasifiers at a vertical distance below the dome (3); and

(d) Feeding the metal carriers into the interior of the melter gasifier at a vertical distance below a dome terminating the melter gasifier (10) toward the top gravitationally under the formation of a strand (44); and

(e) surrounding the strand (44) by a gas jacket (45); and

(f) enclosing and accompanying the freely falling strand (44) from its level of origin (40) onwards over a section (46) of the fall; and

(g) supporting the strand (44) in section (46) against expansion by the gas jacket (45).

2. The method according to claim 1, wherein the metal carriers are sponge iron and wherein said metal is a pig iron melt.

3. The method according to claim 1, wherein the gas jacket (45) is formed by a cooling gas with the formation of a cooling jacket which surrounds a downpipe (33) conducting the metal carriers into the interior of the melter gasifier (10).

4. The method according to claim 1, wherein the level of origin (at 40) of the strand (44) is fixed in a region of the melter gasifier (10) where the maximum velocity of the reducing gas is 0.045 to 0.5 m/s.

5. The method according to claim 1, wherein the gas jacket (45) supports the strand (44) against expansion over a section (46) of the height of fall in which the maximum velocity of the reducing gas is 0.2 to 0.3 m/s.

6. The method according to claim 1, wherein the gas jacket (45) is formed by a gas which flows downward and parallel to the strand and which has a velocity of flow at least more than ten times the maximum velocity of the reducing gas in the interior (31) of the melter gasifier (10).