Title of Invention

SYSTEM FOR COMPACTION OF TOP LAYER OF SINTER BED.

Abstract

SYSTEM FOR COMPACTION OF TOP LAYER OF SINTER BED Abstract The present invention relates to a system for a sintering machine for continuous compacting and sintering of materials, in particular for a steel Plant, for iron oxide is the powdery iron raw material as a principal component, equipped with three sector gate operation and bed height is varying across the sinter bed, characterised by the fact that the top layer of the sinter mix is subjected to differential and variable compaction by a combination of three separate rolls for differential compaction of left, right and middle portion of sinter mix bed.

Full Text

SYSTEM FOR COMPACTION OF TOP LAYER OF SINTER BED. FIELD OF INVENTION This invention relates to the system for a sintering machine by which the top layer of the sinter mix is subjected to differential and variable compaction so as to increase the bulk density of top layers preferentially. Moreover the present invention also relates to a method for thus reducing rim-zone effect in the sinter mix leading to reduction in re-circulating load generation from top layers and by the side of the side plate of pallet and thus achieving higher yield and higher production. BACKGROUND ART In general in a sintering machine the sintering completes very fast in upper part of the bed and slow in lower part of the bed, as a result, sinter quality is not uniform throughout the height of bed and more fines are generated in upper part of the bed. Due to high vertical sintering speed (VSS) in upper part of the bed, heat retention time as well as heat quantity indices are low resulting in low yield and low FeO formation in upper part of the sinter bed. Sinter P|ant -II, Rourkela Steel Plant is equipped with three sector gates for controlling the bed height across the width of sinter machine. Air filtration velocity distribution profile across the width of bed was not uniform due to the RIM zone effect when sinter mix is charged with uniform height across the width of machine, more air tend to flow into bed near the side plates. This effect is called rim zone (wall) effect. Compaction of top layer especially nearer to both side of the pallet is very much essential for maintaining uniform and low air filtration velocity during the initial period of sintering. RDCIS and RSP has jointly developed new type of three rolls compaction roller system and installed at sinter machine at Sinter Plant -II, RSP just before ignition hood. The aim is to produce uniform sinter quality along and across the sinter bed. MATSUMURA TOSHIHIDE; OKATA TOSHIHITO; ANO KOJI; AMANO SHINJI; IIFUSHI TATSUNORI of KOBE STEEL LTD in a Japanese specification JP2005350742A2 discloses method for manufacturing sintered ore by which uneven sintering can be prevented with more certainty by using a DL type sintering machine and controlling, with higher precision, raw material charging density in a pallet-width direction without excessively increasing installation costs and maintenance costs. A cutoff gate and a compacting roller are placed, in this order, between an ore-feed part and an ignition furnace. The cutoff gate is divided into a plurality of split plates along the pallet-width direction, and these split plates are constituted in such a way that they can independently move up and down, respectively. Further, a plurality of thermometers are provided, along the pallet-width direction, inside a wind box corresponding to the position where exhaust-gas temperature is rising over 100°C in the exhaust-gas temperature distribution in the moving direction of the pallet The split plates are separately moved up and down so that the variation in the exhaust-gas temperature distribution in the pallet-width direction measured by the thermometers becomes a prescribed value or below. HOLLON EDMUND D (US); HOLLON BLAKE D (US) in an US specification US6287048 discloses uniform compaction of asphalt concrete. An apparatus having a horizontal compacting roller and a side edge confinement roller or shoe for compacting an asphalt concrete lane. A sensor is on the carrier vehicle for sensing the position of a defined edge of the lane, and a control is provided for steering the carrier vehicle so that the horizontal roller and the edge confinement force roller or shoe follows the defined edge of the lane to provide uniform density. OBJECTIVE OF INVENTION To develop a device, by which the top layer of the sinter mix could subjected to differential and variable compaction so as to increase the bulk density of top layers preferentially and thus reduce rim-zone effect leading to reduction in re- circulating load generation from top layers and by the side of the side plate of pallet and thus achieving higher yield and higher production SUMMARY OF THE INVENTION Accordingly, the present invention discloses a system by which the top layer of the sinter mix is subjected to differential and variable compaction so as to increase the bulk density of top layers leading to reduction in re-circulating load generation from top layers and by the side of the side plate of pallet and thus achieving higher yield and higher production. Such as herein disclosed a machine for continuous compacting and sintering of materials, in particular for a steel Plant, for iron oxide is the powdery iron raw material as a principal component, equipped with three sector gate operation and bed height is varying across the sinter bed, characterised by the fact that the top layer of the sinter mix is subjected to differential and variable compaction by a combination of three separate rolls for differential compaction of left, right and middle portion of sinter mix bed Sinter machine of SP II, RSP is equipped with three sector gate operation and bed height is varying across the sinter bed. The present system is a combination of three separate rolls for differential compaction of left, right and middle of the sinter mix bed. Top layer bulk density of the left, right and middle of sinter mix bed can be adjusted selectively w.r.t. the sinter process parameters. As per one of the exemplary embodiment of the present invention the device is provided with a combination of three separate rolls for differential compaction of left, right and middle portion of sinter mix bed. Another embodiment of the present invention facilitates each compaction rollers to move up and down with respect to the top layer thus imparting differential compaction. As per an object of the present invention there is provided a mechanism so that the top layer bulk density can be adjusted selectively w.r.t the sinter process parameters. As per another object of the present invention there is also provided a mechanism so that the top layer permeability can be changed selectively according to the ignition intensity. As per another object of the present invention the uniform air filtration velocity distribution profile can be achieved even with variation of sector gate opening ratio. As per yet another object of the present invention the waste gas temperature under grate can be made uniform by adjusting the compaction of the bed in left, right and middle portion across the bed for uniform process and sinter quality. As per another exemplary embodiment of the present invention the compaction rollers are made to rotate freely by contacting bed surface when sinter machine is running, thus imparting a compaction action and not a scraping action. As per another object of the present invention, the system provides highly improved top layer yield and higher production in machines operating with higher under grate suction and high sinter machine speed. These together with other objects of the invention, along with the various features of novelty, which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and the specific objects attained by its uses, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated preferred embodiments of the invention. BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWING FIG. 1 is a diagram showing the three rolls compaction roller system as per the present invention. DETAILED DESCRIPTION Referring to figure 1, the compacting and sintering machine according to this invention is constituted by:- a machine bed capable of supporting and holding the various components of the new machine which consists of, mainly three separate rolls for differential compaction of left, right and middle of the sinter mix bed. The Rolls are so placed that the Rolls rotate freely by contacting bed surface when sinter machine is running, thus imparting a compaction action and not a scraping action. Moreover, a "shaping raw material" is what fabricated the powder iron raw material and the mixed raw material of a powder solid-state reducing agent, and the shaping raw material of various properties, such as a thing of a pellet and not only a briquette but the shape of the shape of a monotonous tile and a sheet, is said. The present device imparts differential compaction across the width of the pallet in a preferential way. This facilities in selectively charging the compaction intensity depending on the granulometry of raw mix, the bed height etc, which is not possible otherwise. This will help in achieving uniform air filtration velocity across the width of pallet under all conditions. If the charge of the raw material to a revolving bed furnace is performed by this invention approach using the equipment of above-mentioned this invention, the top layer bulk density can be adjusted and controlled selectively w.r.t the sinter process parameters. Next, the desirable embodiment of the equipment of this invention approach and this invention is explained. A difference arises in extent of the impact are shocked in case the uniform air filtration velocity distribution profile is achieved even with variation of sector gate opening ratio. The waste gas temperature under grate is made uniform by adjusting the compaction of the bed in left, right and middle portion across the bed for uniform process and sinter quality. When roll axes tend to install one set of a double roll compressor in the migration direction of a rotary furnace floor and the direction which intersects perpendicularly, i.e., the cross direction of a hearth, the roll die length of the die length same at least as the width of face of a hearth is needed, mechanism so that the top layer permeability can be changed selectively according to the ignition intensity. Industrial trials were conducted at SP-II, RSP to study the effect of top layer compaction in sintering process parameters. Results indicated that after compaction of top layer air flow in first four wind legs has reduced and last wind legs has improved i.e. vertical sintering speed (VSS) has reduced in top layer and high in bottom layer of the sinter bed thus getting uniform VSS in all layers along the height of bed. Average air filtration velocity across the pallet in left, middle and right side before top layer compaction was 0.40/0.36/0.31 m/sec. Therefore, the system provides highly improved top layer yield and higher production in machines operating with higher under grate suction and high sinter machine speed. After installation of compaction rollers top layer of the sinter bed was properly compacted. Average air filtration velocity across the bed in left, middle and right side had changed to 0.49/0.45/0.40 m/sec. i.e. almost uniform. Sinter machine productivity had improved to 254 t/hr. i.e. 1.32 t/m2/hr. air flow through the bed also increased due to the proper compaction near the side plate of the both side of the pallets and reduction in air infiltration through side plate leakages. Tumbler Index (Tl) was varying 73.8 to 74.3% in top and bottom layer of the bed i.e. difference between top and bottom layer is 0.5% Airflow in wind legs number 0 to 5 and total airflow in wind legs number 0 to 23 is given in Table-1. Although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof, it has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed. It will be apparent to those having ordinary skill in the art that a number of changes, modifications, variations, or alterations to the invention as described herein may be made, none of which depart from the spirit or scope of the present invention. The particular embodiments and applications were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such changes, modifications, variations, and alterations should therefore be seen as being within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled. We Claim :- 1. The system for a sintering machine for continuous compacting and sintering of materials, in particular for a steel Plant, for iron oxide is the powdery iron raw material as a principal component, equipped with three sector gate operation and bed height is varying across the sinter bed, characterised by the fact that the top layer of the sinter mix is subjected to differential and variable compaction by a combination of three separate rolls for differential compaction of left, right and middle portion of sinter mix bed. 2. The system as claimed in claim 1, wherein the combination of three separate rolls for differential compaction of left, right and middle of the sinter mix bed is adjusted selectively w.r.t. the sinter process parameters. 3. The system as claimed in claim 1, wherein the combination of three separate rolls reduces rim-zone effect leading to reduction in re-circulating load generation from top layers and by the side of the side plate of pallet. 4. The system as claimed in claim 1, wherein each compaction roll can move up and down with respect to the top layer thus imparting differential compaction. 5. The system as claimed in claim 2, wherein top layer bulk density is adjusted selectively w.r.t the sinter process parameters. 6. The system as claimed in claim 2, wherein top layer permeability can be changed selectively according to the ignition intensity. 7. The system as claimed in claim 2, wherein uniform air filtration velocity distribution profile is achieved even with variation of sector gate opening ratio. 8. The system as claimed in claim 2, wherein waste gas temperature under grate is made uniform by adjusting the compaction of the bed in left, right and middle portion across the bed for uniform process and sinter quality. 9. The system as claimed in claim 1, wherein the rolls rotate freely by contacting bed surface when sinter machine is running, thus imparting a compaction action and not a scraping action. 10. The system as claimed in claim 1, wherein the top layer yield is improved even in machines operating with higher undergrate suction and high sinter machine speed. 11. The system for a sintering machine for continuous compacting and sintering of materials, substantially as herein described with particular reference to accompanying drawings. SYSTEM FOR COMPACTION OF TOP LAYER OF SINTER BED Abstract The present invention relates to a system for a sintering machine for continuous compacting and sintering of materials, in particular for a steel Plant, for iron oxide is the powdery iron raw material as a principal component, equipped with three sector gate operation and bed height is varying across the sinter bed, characterised by the fact that the top layer of the sinter mix is subjected to differential and variable compaction by a combination of three separate rolls for differential compaction of left, right and middle portion of sinter mix bed.

Documents:

00038-kol-2007 correspondence-1.1.pdf

00038-kol-2007 p.a.pdf

0038-kol-2007 abstract.pdf

0038-kol-2007 claims.pdf

0038-kol-2007 correspondence others.pdf

0038-kol-2007 description(complete).pdf

0038-kol-2007 drawings.pdf

0038-kol-2007 form-1.pdf

0038-kol-2007 form-2.pdf

0038-kol-2007 form-3.pdf

38-KOL-2007-(18-11-2011)-ABSTRACT.pdf

38-KOL-2007-(18-11-2011)-CLAIMS.pdf

38-KOL-2007-(18-11-2011)-DESCRIPTION (COMPLETE).pdf

38-KOL-2007-(18-11-2011)-DRAWINGS.pdf

38-KOL-2007-(18-11-2011)-EXAMINATION REPORT REPLY RECIEVED.PDF

38-KOL-2007-(18-11-2011)-FORM-1.pdf

38-KOL-2007-(18-11-2011)-FORM-2.pdf

38-KOL-2007-(18-11-2011)-FORM-3.pdf

38-KOL-2007-CORRESPONDENCE OTHERS-1.2.pdf

38-KOL-2007-CORRESPONDENCE.pdf

38-KOL-2007-EXAMINATION REPORT.pdf

38-kol-2007-form 18.pdf

38-KOL-2007-FORM 3.pdf

38-KOL-2007-GRANTED-ABSTRACT.pdf

38-KOL-2007-GRANTED-CLAIMS.pdf

38-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf

38-KOL-2007-GRANTED-DRAWINGS.pdf

38-KOL-2007-GRANTED-FORM 1.pdf

38-KOL-2007-GRANTED-FORM 2.pdf

38-KOL-2007-GRANTED-SPECIFICATION.pdf

38-KOL-2007-PA 1.1.pdf

38-KOL-2007-PA.pdf

38-KOL-2007-REPLY TO EXAMINATION REPORT.pdf

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