US2527311A - Batch sintering machine - Google Patents

Description

Oct. 24, 1950 w, K s 7 2,527,311

BATCH SINTERING MACHINE Filed July 24, 1948 INVENTOR.

BY Willi Ke/Jey Patented Oct. 24, 1950 UNITED STATES PATENT ()FFICE 2,527,311 BATCH SINTERING MACHINE I Walter. Kelsey, New York, N. Y.

Application July 24, 1948, Serial No. 40,605

2 Claims. (Cl. 266-21) This invention relates to batch sintering machines.

In machines of. this type the batch was sintered and then removed by a dumping action, or was laterally removed bythe action of the charge retaining frames operated to shove the sinter to one side and off of the stationary grate. In such batch sintering mechanisms, induced air was used, which necessitated expensive suction action installations. In such mechanisms, the ignition hood was used to ignite the batch to be sintered, but was not a further necessary requirement in the suction action during the sintering.

. The object of this invention is to make possible an economical plant of large capacity for sintering fine enriched ores and smaller. plants for the small steel mills, for disposal of. fly ash, and for other uses.

This invention consists in introducing into the ignition hood of the well known batch sintering plant a forced air draft for burning the sinter stock instead of using the suction or induced draft applied to the under side of the grate carrying the stock to be sintered. This improvement makes possible the use of less. expensive and a more compact combination of equipment. The plant with the side discharge and fixed grate combined with this invention will have many uses. Also the application of this invention to the dumping type of plan will reduce its cost and broaden its use.

This invention consists in placing a forced draft fan above the ignition hood and discharging air through a duct into the ignition hood, the said fan with its operative equipment to be carried on a truck that carries the ignition hood with its operating; equipment. This forced draft fan discharging air into the ignition hood placed centrally over the pan or sinter retaining frame replaces the exhaust fans at present used. and an exhaust duct from below the grate to the chimney replaces the suction pipes at present used. These improvements provide great saving in original cost. The sinter igniting fuel, generally gas or oil, must be forced into this compressed air in the ignition hood, ignited, and built up to a sinter igniting flame covering substantially the whole surface of the sinter to be ignited. This flame is to be continued for the time required to ignite the sinter and is then quenched. The air pressure is, however, to be maintained and the ignition hood is to be held in place until the batch or charge of sinter stock is fully sintered. The fuel oil or gas in introduced into the ignition hood through burners.

The said fuel oil'or gas is ignited by pilot lights suitably placed for that purpose, the pilot lights burning continually to avoid accidents. Explosion doors are placed on the ignition hood, and peep holes with transpar ent covers are suitably placed.

The invention then consists of a plenum chamber, in which the pressure of the air in the enclosed space is greater than that of the outside atmosphere, the air being forced into said space, so that leakage is outward instead of inward, which plenum chamber is formed by the hood resting on the walls surrounding the batch and grate, wherein the entire air above, through and below the batch to be sintered is subject to such compression.

The particles forming the batch are thereby ignited and brought to combustion in the presence of ample supplies of oxygen, insuring a good sinter.

The invention will be more fully described here inafter, embodiments thereof shown in the drawings, and the invention will be finally pointed out in the claims.

In the accompanying drawings,

Fig. 1 is a vertical section of a sintering apparatus embodying the invention showing an ignition hood, taken on line l! of Fig. 2 as seen in the direction of the. arrows, the sintering batch machine being of the horizontal discharge type, the charge being removed by the action of the charge retaining side and end wall frames operated. to shove the sinter to one side and off of the stationary grate;

Fig. 2 is a vertical section of the said apparatus taken on line 22 of Fig. 1, as seen in the direction of the arrows;

Fig. 3 is a vertical section of an apparatus, embodying the invention, taken. on line 33 of Fig. i, as seen in the direction of the arrows, embody-- ing the dumping batch sintering pan.

. Fig. i is a vertical section of the apparatus,"

embodying the invention, taken on line 44 of Fig. 3, as seen in the direction of the arrows.

Fig. 5 is an enlarged diagram of one edge of the ignition hood, end frame, and grate, embodying the invention, taken at point 5 of Fig. 2, the sintering batch being of the horizontal discharge Referring to the drawings, and more particularly to Figs. 1, 2 and 5, the sinter stock retaining frame 25 has a front frame joining member wall 26 and two end frame parts or walls 28, forming a U to hold a batch to be sintered. A rear bar or wall 21 closes the open end of the U. This frame 25 is above the grate and around three sides of the batch and wall 21 is along the fourth side all set back from the edge of the horizontal stationary grate 29. Below the grate 29 is a chamber I9. A space 96 is provided between the edge 29B of the grate and the face of the wall 28 and of the frame 25 and wall 21. A rail 59 supports a truck 6|, an ignition hood 60A and burners 62. The above parts are parts of a horizontal side discharge sintering plant.

The present improvement consists in providing a plenum chamber by walls enclosing the batch to be sintered.

In Figs. 1 and 2, the forced draft fan I is mounted on the truck GI and discharges down through duct IOI into top of ignition hood 60A. Gas or oil fuel burners B2 are so placed as to throw the igniting flame to all parts of the surface of sinter stock within frame 25. Pilot lights I02 so placed as to ignite the gas or oil fuel, preferably supplied with bottled gas. Other construction and operating equipment for an operating ignition hood and forced draft fan and burners are not shown as the same are well known. The air and gases of combustion are forced through the sinter bed on grate 29 into the gas discharge chamber I9 thence through duct 99 to chimney or other means of disposal. When several sinter beds are used in the opera-- tion, cutoff dampers are installed in each duct 99.

In Fig. 5, the ignition hood 60 as shown with all four bearing edges of the hood hitting the top of the frame or walls spaced back from the inside edges of the walls allowing the ignition flame to ignite the sinter stock for the full surface up to the faces of the four walls 26, '21, 28 and 28. Ignition hood 60A in this invention has the four outer inclosing walls I03 placed substantially over edge of grate 29B giving a set in space I from the inside face of the vertical side of the hood I03 to each of the four walls 26, 21, 28 and 28, with the horizontal leg of the air seal I94 covering the space I05 and bearing on the top of the four walls. This horizontal leg of the air seal I04 rests on the sinter stock charge for the space I05 at the level I06. For providing clearance for moving the hood from charge to charge, the piece I04 (Fig. 5) is vertically adjustably supported along the wall I03, by suitable means, as for instance a tightening device I03A. When the hood isin operating position, the piece I04 is dropped to the top of the wall 28. A similar adjustment I I4A for the piece I I4, is shown in Figures 3 and 4, to seal the hood II3 against air escape. The resting of the air seal I04 on the sinter stock charge for the space of I05 prevents the ignition flame from igniting the top layer of sinter stock in this space which continues along the four sides of the charge. Consequently the sinter stock below space I05 and against the inside faces of the walls will be only partly burned as the draft through the gate at the point 29B will pull the fire away from the face of the walls. This partly burned layer of sinter stock between the walls and the burned sinter cake will permit a very easy separation of the walls and sinter cake. The space I05 is, of course, under the internal pressure of the plenum, but the air is relatively quiescent, the air currents under pressure taking the path to the point 293.

In Figs. 3 and 4 is shown a well known dumping batch sintering pan combined with the removable superimposed ignition hood. Above the supporting grate I I6 a space for the sinter charge is provided. The discharge gas chamber II5 has a draft outlet discharge through one or both of the trunnions H8. The ignition hood II3 with vertically rising air sealing pieces I I4 and a duct III, is supported on the truck II2. Other pieces necessary for construction and operation of the pan and the hood, the air sealing piece, and the truck are not shown as well known. The improved parts of Figs. 3 and 4 are the forced draft fan I I0 mounted on the truck I I 2, discharging its air through the duct III into the top of the ignition hood II3, with oil or gas burners 62 so located as to throw the ignition flame over the whole surface of the sinter charge. Pilot lights I02, are so placed as to ignite the gas or oil fuel, preferably supplied with bottled as. Other construction and operating equipment for the forced draft fan and burners are not shown, as well known.

In each embodiment, the draft fan operated by the motor and the air duct with the hood is supported by the truck and forms the upper part of the plenum. The walls of the sinter batch frame form the intermediate part of the plenum, and walls of the gas chamber, in one embodiment, or the closed bottom of the dumping sintering pan, on the other hand, form the lower part of the plenum, the former with its outlet 99 and they latter with its outlet I I8.

In Fig. 6 one form of the plenum of the type of Fig. 2, is shown diagrammatically to exemplify the enclosing wall structurefilled with high presto be limited to the exact details of construction shown and described, for obvious modifications will occur to a person skilled in the art.

I claim: I

1. In a batch sintering plant, a plenum chamber having enclosing walls around a vertical axis, with an upper portion formed of an ignition hood and a coaxial conduit, and a lower portion formed of a gas discharge chamber, said portions diverging towards each other, and with the central part of the plenum chamber of largest cross-section, means supplying said plenum chamber at its upper part with compressed air, a horizontally disposed grate within said plenum chamber at its central part, a horizontally disposed sinter batch frame above the grate, and adjacent thereto, both the grate and frame being within said plenum chamber, the plenum chamber below the grate having an opening for discharging its contents, after the compressed air passed from above to below the sintering batch frame and grate, and the inner walls of the said frame being laterally beyond the walls of the hood and gas discharge chamber, said walls of the hood and gas discharge chamber being in substantially vertical alignment within the sinter batch frame.

2. In a batch sintering plant, the combination of a grate, sinter charge retaining walls extending above and laterally beyond the outer walls of the grate, a removable ignition hood over said walls, a hood air seal between the hood and the retaining walls, a gas discharge chamber below the grade, and means supplying air to the sinter charge, the proximate walls of the hood and gas discharge chamber being generally vertically aligned, and the sinter charge retainingwalls being laterally outward of said vertical alignment forming a space, whereby said air passes' from the ignition hood into and through the sinter charge and through the grate, to the gas discharge chamber, and to the outlet thereofand said air flows from the ignition hood sid alls to the edge of the grate with the air flow-spaced from the said lateral space and from the faces of the retaining walls, preventing ignitionof the sinter in said lateral space. j.

WALTER; KELSEY.

REFERENCES CITED The following references are of record in the file of this patent:

Number Lloyd July 10, 1945

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