US1192395A - Blast-furnace. - Google Patents

Description

P. m: SIMONEY BLAST FURNACE. APPLICATION FILED MAY 5. I916- 8 Y Z I i /J I o WW I y 24590191. 675 51/40/102) 5 I 12 Patented July 25, 1916;

PASQUALE DE SIMONEY, 0F YOUNGSTOWN, OHIO.

BLAST-FURNACE.

Specification of Letters Patent.

Patented July 25, 1916.

Application filed May 5, 1916. Serial No. 95,654.

To all w hem it may concern Be it known that I, PASQUALE Dn SIMO- NEY, a citizen of the United States, residing at Youngstown, in the county of Mahoning and State of Ohio, have invented certain new and useful Improvements in Blast-Furnaces, of which the following is a specification.

This invention relates to metallurgical furnaces, and has particular reference to a novel improvement therein for collecting Solid matter and dust blown from the explosion pipes.

As is well known in the operation of blast furnaces there sometimes occurs what is known as an explosion, the force of which often expels large quantities of hot raw material including lumps as well as a fine dust out of the explosion pipes or downcomer tubes, and this material is scattered over the surrounding territory, not only endangering the lives of workmen, but at the same time wasting much raw material. That is to say, due to some defect or irregularity in the mixing of the materials, the furnace will sometimes hang or stick, which means that part of the raw materials, usually the limestone and coke, in the process of production, will harden and stick to the inner wall of the furnace. In due time this collection of material on the sides of the furnace is followed by what is known as a slip, or in other words, the material will, after a certain period, become loose and fall down into the furnace, thus producing a violent explosion.

Accordingly, the present invention has in view a novel and practical attachment for the outlet end of the so-called explosion pipes, whereby the material'thrown out of the furnace, by the action above described, will be collected and returned to the furnace, thus greatly lessening the danger hazard in the operation of blast furnaces, and economizing in raw material. I v

A further object of the invention is to provide a device which is simple in con: struction and comparatively. cheap to install and maintain, thereby holding the cost of equipment and maintenance to a minimum figure, and at the same time providing a device which permits the force of theexplosion to spend itself withoutdoing any damage to the furnace or the attachment itself.

That is to say, that although it is proposed to cage-in or house the outlet end of the ex plosion pipe, it is contemplated to provide a construction whereby the force of the explosion may expand sufficiently on passing out the outlet end of the explosion pipe to prevent the bursting of the latter by back pressure or likewise damaging the attachment.

lVith the above and other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts hereinafter more fully described, illustrated and claimed.

A preferred and practical embodiment of the invention is illustrated in the accompanying drawing, in which Figure l is a detail elevation of a portion of a blast furnace showing one of the explosion pipes and the present invention applied thereto. Fig. 2 is a vertical sectional view of the attachment shown in Fig. 1.

Similar reference characters designate corresponding parts throughout the several figures of the drawings.

By reference to the accompanying drawing, it will be observed that it is proposed to provide a simple and substantial deviceor attachment which may be readily fitted to the outlet end of an explosion pipe of a blast furnace. Therefore, Fig. 1 shows a portion of a blast furnace B having the explosion pipe E extending upwardly therefrom, and the usual charging port C for receiving the charge of ore and melting flux. The attachment above referred to, is designated generally as 1, and essentially comprises a substantially cylindrical casing or drum 2 having an inclined floor or bottom 3 and an upper cap or closure member l, thus providing a relatively capacious receivingand collecting compartment R for the outlet end of the explosion pipe E, as will be more clearly apparent from Fig. 2. This compartment is accessible for repairs or cleaning through the manhole M in the side of the drum.

The inclined floor 3 of the receiving and collecting drum preferably rests upon supporting flanges, rigidly secured to the outer surface of the explosion pipe E, at a point below the outlet. Thus, the outlet end of the pipe extends a, considerable distance into the interior of the drum, and is provided with a cone valve 6, carried at one end of a valve lever 7 pivoted as at 8 in the wall of the drum, and having an operating connection 9 for manually operating the valve when desired. The lower portion of the drum 2 is provided with a coarse material gravity return pipe connection 10, whose general inclination and arrangement is such that the inside surface 11 thereof is 111 ahnement with the inclined floor 3 of the drum, thus providing an inclined gravity feed surface from the interior of the drum to the outlet end section 12 of the pipe which is directed downwardly into the flared mouth of the charging port C of the furnace. In connection with the pipe 10 it will be observed that the same connects with the drum 2 at a point below the outlet end of the explosion pipe E, thus making it impossible for material thrown out of the pipe to follow a direct path from the said outlet into the pipe 10. In other words, when solid material is expelled from the explosion pipe, it will be thrown into the receiving chamber R and then settle around the end of the tube E within the chamber on the inclined floor 3,

from whence'it will slide or gravitate down the inclined interior of the pipe 10 and to the charging port of the furnace. To facilitate the return of the dust and finer materials discharged from the explosion pipe to the furnace, the upper or cap portion t of the drum 2 is provided with a fine material gravity return pipe connection 13 which connects as at 14 with the said cap and as at 15 withthe outlet end 12 of the coarse material pipe 10. This pipe 13 is intended to carry the finer particles and dust back to the charging port of the, furnace more rapidly than would be the case if both coarse and fine material had to be returned to the furnace by way-of the pipe 10. That is to say, the finer particles of material, usually in the form of dust, hang in the upper portion of the receiving chamber R and do not settle until long after the coarser material has passed back to the furnace by way of the inclined pipe and floor 3. Owing to the lightness of these particles, the same will not travel down the inclined surface just referred to without some assistance, and therefore, the drum would always contain more or less fine material unless some agency were provided for removing the same. In other words, owing to the weight of the coarse material that settlesaround the end of the pipe E on the inclined floor 3 the same will readily slide down the incline3-11 which has only a relatively slight pitch, and at the same time carry with it all of the finer material that may settle in a relatively short space of time.

However, as stated, the fine dust will remain suspended in the upper portion of the chamber R for some time after the heaviermaterials have been returned to the furnace. If

this dust should settle on the incline 3-11 after the coarse material has been thus disposed of, it would remain there indefinitely, and in fact, probably necessitate manual assistance to returnto the furnace. However, this condition is obviated by the pipe 13, which is arranged at much greater pitch than the pipe 10, and communicates with the extreme upper portion of the drum, to facilitate the removal of fine material from the upper part of the chamber. Thus, the pipe 13 fulfils its purpose by providing a steep inclined surface for returning the fine material to the furnace, while the pipe 10 provides an inclined surface of relatively less pitch for returning the coarse material to the furnace.

Accordingly, it will be apparent that a novel and distinctive feature of the present invention is the provision of separate gravity return feed surfaces, respectively arranged at different pitches and adapted to return both fine and coarse material to the charging port of the furnace. These inclined or gravity return faces are respectively designated as w and y, the former being provided by the pipe section 13 while the latter comprises the inclined floor 3 at the bottom of the drum and the inner surface 11 of the pipe section 10.

With the arrangement described, it will be clear that upon an explosion in the furnace, an eruption takes place, the force of which lifts the cone valve 6 from its seat at the outletend of the explosion pipe E, and all of the material expelled from the explosion pipe will becollected in the receiving chamber R of the drum 2. The heavy solid particles will naturally fall to the inclined floor 3, while the lighter particles will rise to the top of the drum and pass into the fine material return pipe section 13 from the curved neck section or elbow N, which connects the said pipe section with the cap t of the drum. On account of the steep inclination or pitch of the gravity return surface as, the fine material will be rapidly conducted to the discharge opening 12 which is common to both of the gravity return surfaces as and y. The device, therefore, effectually provides for the return of'both solid and fine pieces of ore, coke and the like to the charging port of the furnace in a quick and effective manner.

Without further description, it is thought that the many features and advantages of the invention will be readily understood, and it will, of course, be understood that changes in the form, proportion and minor details of construction may be resorted to without departing from the spirit of the invention or scope of the appended claims.

I claim: a

1. An attachment for blast furnaces, comprising a receiver carried by the upper end of the furnace explosion pipe and having separate gravity return surfaces arranged at 'ise different pitches and both discharging into the charging port of the furnace.

2. An attachment for blast furnaces comprising a receiver carried by the outlet end of the furnace explosion pipe and comprising a receiving and collecting drum having inclined gravity return surfaces arranged at different pitches and discharging into the charging port of the furnace.

3. An attachment for blast furnaces, comprising a receiver carried by the outlet end of the furnace explosion pipe and comprising a receiving and collecting drum having inclined gravity return surfaces leading respectively from the upper and lower ends of the drum and having a common point of dis charge below the lower edge of the drum into the said charging port of the furnace.

' 4. An attachment for blast furnaces, comprising a receiver carried by and fitting over the outlet end of the furnace explosion pipe, said receiver having an inclined floor disposed below the outlet end of the explosion pipe, a fine material gravity return surface communicating with the upper end of said drum, and a coarse material gravity return surface communicating with said drum at its lower end, said gravity return surface at the lower end of the drum being coincident with the inclined floor at the bottom of the drum.

5. An attachment for blast furnaces, comprising a receiving and collecting drum fitted to the outlet of the furnace explosion pipe and having an inclined floor at its lower end, a conical cap member at its other end having a central opening, a fine material conducting pipe connecting with said cap member at the outlet thereof, and a coarse material conducting pipe section communi eating with the drum at its lower portion and having the lower inner face thereof coincident with the inclined portion of the drum, said pipes having a common discharge outlet opening into the furnace charging portion.

6. An attachment for blast furnaces comprising a receiving and collecting drum fitting over the outlet end of the furnace explosion pipe and having an inclined floor at its lower end, a conical cap member at its upper end provided with a central outlet, a fine material conducting outlet pipe communicating with said drum through the opening in the cap, a coarse material conducting pipe having one end communicating with the drum at the lower portion thereof and having its wall coincident and in the same plane with the inclined floor of the drum, the other end of said pipe opposite its connection with the drum having a downwardly directed outlet, and said fine material conducting pipe having its discharge end opening into said downwardly directed outlet of the coarse material pipe.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

PASQUALE DE SIMONEY.

Witnesses:

C. G. RUDIBAUGH, H. G. GUSS.

Gopies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. 0.

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