Title of Invention	"AN APPARATUS AND A PROCESS FOR PRODUCING REDUCED PARTICULATE OXIDE-CONTAINING MATERIAL IN PARTICULAR FINE ORE"
Abstract	In a process for reducing paniculate oxide-containing material in the whirl bed method, the oxide-containing material, by means of reducing gas flowing from bottom to top, is maintained in a whirl layer, thus being reduced. In order to avoid, or considerably reduce, operational interruptions of the reduction process caused by sticking or fouling, the clear tube speed of the reducing gas, exclusively above the whirl layer (24), is lowered over the total free cross section (31, 32, 33) of a space present above the whirl layer (24) continuously and under avoidance of whirl formations (Fig. 2).

Title of Invention

"AN APPARATUS AND A PROCESS FOR PRODUCING REDUCED PARTICULATE OXIDE-CONTAINING MATERIAL IN PARTICULAR FINE ORE"

Abstract

Full Text	In a process for reducing paniculate oxide-containing material in the whirl bed method, the oxide-containing material, by means of reducing gas flowing from bottom to top, is maintained in a whirl layer, thus being reduced. In order to avoid, or considerably reduce, operational interruptions of the reduction process caused by sticking or fouling, the clear tube speed of the reducing gas, exclusively above the whirl layer (24), is lowered over the total free cross section (31, 32, 33) of a space present above the whirl layer (24) continuously and under avoidance of whirl formations (Fig. 2). WE CLAIM: 1. Apparatus for producing reduced particulate oxide-containing material comprising at least one whirl-layer reactor(l-4), the whirl-layer reactor comprising a cylindrical lower whirl layer section(25) for accommodating the whirl layer(24), comprising a gas distribution bottom(26), a supply duct(17,19) for the reducing gas, a supply duct for oxide-containing material and a discharge duct(6) for oxide-containing material, wherein the supply duct and the discharge duct for oxide- containing material are provided above the gas distribution bottom(26), a tapered section(28) arranged immediately above the whirl layer section(25) and widening conically upwards, wherein the inclination of the wall(29) of the tapered section(28) relative to the central axis(30) of the reactor amounts to 10° at most; and a calming section(35) being cylindrical at least in part and being arranged immediately above the tapered section(28), wherein the top of the calming section is closed and a reducing-gas discharge duct(19) departs from the calming section. 2. An apparatus as claimed in claim 1, wherein the clear tube cross section in the tapered section (28) increases by at least 25%, preferably by at least 50%, between the entry cross section (32) and the exit cross section (33) of the tapered section (28). 3. An apparatus as claimed in claim 1 or 2, wherein at least one dust separator (38) is arranged within the reduction reactor, its entry opening for the dust-loaded reducing gas being provided in the region of the calming section (35) and a dust-recycling duct (39) of the dust separator (38) reaching as far as into the whirl layer section (25). 4. An apparatus as claimed in one or several of claims 1 to 3, wherein the inclination of the wall (29) of the tapered section (28) relative to the central axis (30) of the reactor is 8° at most. 5. An apparatus as claimed in claim 4, wherein the inclination of the wall (29) of the tapered section (28) relative to the central axis (30) of the reactor ranges between 6° and 8°. 6. An apparatus as claimed in any one or several of claims 1 to 5, wherein said apparatus comprises a plurality of consecutively arranged whirl-layer reduction reactors (1 to 4) connected by means of reducing gas ducts (19) and by means of conveying ducts (6) conveying the oxide- containing material from one reactor to another reactor, and that merely the ultimately arranged reactors (3, 4), seen in the flow direction of the oxide-containing material, preferably merely the last arranged reactor (4), is/are provided with a tapered section (28). 7. A process of producing reduced particulate oxide-containing material, in particular fine ore in a fluidised bed as claimed in any proceeding claims, comprising the steps of forming a whirl layer of particulate oxide-containing material by means of a reducing gas, wherein the reducing gas is blown upwards from below with a clear tube speed sufficient to maintain the particulate oxide-containing material in the whirl layer; continuously lowering the clear tube speed of the reducing gas over the total free cross section above the whirl layer, so that whirl formations are avoided; and reducing the particulate oxide- containing material by means of the reducing gas. 8. A process as claimed in claim 7, wherein reducing of the oxide- containing material is carried out stepwisely in consecutively arranged whirl layers and under increase of the degree of reduction from step to step, the clear tube speed of the reducing gas being lowered from that step from which a minimum degree of reduction of 25% is obtained. 9. A process as claimed in claim 7, wherein clear tube speed of the reducing gas is lowered from that step from which a minimum degree of reduction of 50% is obtained. 10. A process as claimed in any one or several of claims 7 to 9, wherein the clear tube speed of the reducing gas above the whirl layer is lowered by at least 25%, preferably by at least 50%. 11. A process as claimed in any one or several of claims 7 to 9, wherein the clear tube speed of reducing gas is lowered from 0.8 m/s to 1.5 m/s on the entry side to 0.4 m/s to 0.75 m/s on the exit side. 12. A process as claimed in any one or several of claims 1 to 11, wherein the clear tube speed in the whirl layer and in a space above that space in which the clear tube speed of the reducing gas is lowered is kept substantially constant. 13. An apparatus for producing reduced particulate oxide-containing material substantially as hereinbefore described and with reference to the accompanying drawings. 14. A process of producing reduced particulate oxide-containing material substantially as hereinbefore described and with reference to the accompanying drawings.

Full Text

In a process for reducing paniculate oxide-containing material in the whirl bed method, the oxide-containing material, by means of reducing gas flowing from bottom to top, is maintained in a whirl layer, thus being reduced.
In order to avoid, or considerably reduce, operational interruptions of the reduction process caused by sticking or fouling, the clear tube speed of the reducing gas, exclusively above the whirl layer (24), is lowered over the total free cross section (31, 32, 33) of a space present above the whirl layer (24) continuously and under avoidance of whirl formations (Fig. 2).

WE CLAIM:
1. Apparatus for producing reduced particulate oxide-containing
material comprising at least one whirl-layer reactor(l-4), the whirl-layer
reactor comprising a cylindrical lower whirl layer section(25) for
accommodating the whirl layer(24), comprising a gas distribution
bottom(26), a supply duct(17,19) for the reducing gas, a supply duct for
oxide-containing material and a discharge duct(6) for oxide-containing
material, wherein the supply duct and the discharge duct for oxide-
containing material are provided above the gas distribution bottom(26), a
tapered section(28) arranged immediately above the whirl layer
section(25) and widening conically upwards, wherein the inclination of
the wall(29) of the tapered section(28) relative to the central axis(30) of
the reactor amounts to 10° at most; and a calming section(35) being
cylindrical at least in part and being arranged immediately above the
tapered section(28), wherein the top of the calming section is closed and
a reducing-gas discharge duct(19) departs from the calming section.
2. An apparatus as claimed in claim 1, wherein the clear tube cross
section in the tapered section (28) increases by at least 25%, preferably
by at least 50%, between the entry cross section (32) and the exit cross
section (33) of the tapered section (28).
3. An apparatus as claimed in claim 1 or 2, wherein at least one dust
separator (38) is arranged within the reduction reactor, its entry opening
for the dust-loaded reducing gas being provided in the region of the
calming section (35) and a dust-recycling duct (39) of the dust separator
(38) reaching as far as into the whirl layer section (25).
4. An apparatus as claimed in one or several of claims 1 to 3, wherein
the inclination of the wall (29) of the tapered section (28) relative to the
central axis (30) of the reactor is 8° at most.
5. An apparatus as claimed in claim 4, wherein the inclination of the
wall (29) of the tapered section (28) relative to the central axis (30) of the
reactor ranges between 6° and 8°.
6. An apparatus as claimed in any one or several of claims 1 to 5,
wherein said apparatus comprises a plurality of consecutively arranged
whirl-layer reduction reactors (1 to 4) connected by means of reducing
gas ducts (19) and by means of conveying ducts (6) conveying the oxide-
containing material from one reactor to another reactor, and that merely
the ultimately arranged reactors (3, 4), seen in the flow direction of the
oxide-containing material, preferably merely the last arranged reactor (4),
is/are provided with a tapered section (28).
7. A process of producing reduced particulate oxide-containing
material, in particular fine ore in a fluidised bed as claimed in any
proceeding claims, comprising the steps of forming a whirl layer of
particulate oxide-containing material by means of a reducing gas,
wherein the reducing gas is blown upwards from below with a clear tube
speed sufficient to maintain the particulate oxide-containing material in
the whirl layer; continuously lowering the clear tube speed of the
reducing gas over the total free cross section above the whirl layer, so
that whirl formations are avoided; and reducing the particulate oxide-
containing material by means of the reducing gas.
8. A process as claimed in claim 7, wherein reducing of the oxide-
containing material is carried out stepwisely in consecutively arranged
whirl layers and under increase of the degree of reduction from step to
step, the clear tube speed of the reducing gas being lowered from that
step from which a minimum degree of reduction of 25% is obtained.

9. A process as claimed in claim 7, wherein clear tube speed of the
reducing gas is lowered from that step from which a minimum degree of
reduction of 50% is obtained.
10. A process as claimed in any one or several of claims 7 to 9,
wherein the clear tube speed of the reducing gas above the whirl layer is
lowered by at least 25%, preferably by at least 50%.
11. A process as claimed in any one or several of claims 7 to 9,
wherein the clear tube speed of reducing gas is lowered from 0.8 m/s to
1.5 m/s on the entry side to 0.4 m/s to 0.75 m/s on the exit side.
12. A process as claimed in any one or several of claims 1 to 11,
wherein the clear tube speed in the whirl layer and in a space above that
space in which the clear tube speed of the reducing gas is lowered is kept
substantially constant.
13. An apparatus for producing reduced particulate oxide-containing
material substantially as hereinbefore described and with reference to
the accompanying drawings.
14. A process of producing reduced particulate oxide-containing
material substantially as hereinbefore described and with reference to
the accompanying drawings.

Documents:

376-del-1995-abstract.pdf

376-del-1995-claims.pdf

376-DEL-1995-Correspondence Others-(29-04-2011).pdf

376-del-1995-correspondence-others.pdf

376-del-1995-correspondence-po.pdf

376-del-1995-description (complete).pdf

376-del-1995-drawings.pdf

376-del-1995-form-1.pdf

376-del-1995-form-13.pdf

376-del-1995-form-2.pdf

376-DEL-1995-Form-27-(29-04-2011).pdf

376-del-1995-form-3.pdf

376-del-1995-form-4.pdf

376-del-1995-form-9.pdf

376-del-1995-gpa.pdf

376-del-1995-petition-124.pdf

376-DEL-1995-Petition-138-(29-04-2011).pdf

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Patent Number

190260

Indian Patent Application Number

376/DEL/1995

PG Journal Number

31/2009

Publication Date

31-Jul-2009

Grant Date

12-Mar-2004

Date of Filing

07-Mar-1995

Name of Patentee

VOEST-ALPINE INDUSTRIEANLAGENBAU GMBH

Applicant Address

44 TURMSTRASSE, A-4020 LINZ, AUSTRIA

Inventors:

#	Inventor's Name	Inventor's Address
1	WERNER LEOPOLD KEPPLINGER	7 LAHHOLDSTRASSE, A-4060 LEONDING, AUSTRIA
2	SIEGFRIED ZELLER	24 ANTON-OBERSCHEIDERWEG, A-4060 LEONDING, AUSTRIA
3	KARL-HEINZ ZIMMERBAUER	111 FIRSHING, A-4483 HARGELSBERG, AUSTRIA
4	ROY HUBERT WHIPP JR	10340 SW 138TH ST.,MIAMI, F1.33176, U.S.A

PCT International Classification Number

C21B13/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA