US992839A - Blast-stove apparatus. - Google Patents

Description

H. O. WOLLE & J. V. SYMONS.

- BLAST STOVE APPARATUS.

APPLIOATION FILED NOV.19, 1910. 992,839, Patented May 23 15,91

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vT-IABLI.IJI FSI C. WOLLE AND JOHNSON V. SYMONS, OF WESTMONT BOROUGH, PENNSYL- VANIA.

BLAST-ST OVE APPARATUS.

Specification of Letters Patent.

Patented May 23, it 1 11.

Application filed November 19, 1910. Serial No. 593,130.

To utt whom it may concern:

lie. it known that we. l'lAR'i'LEY C. \Yonnn and Jonxsox V. Srnoxs, citizens of the l'nited States, residing in the borough of ll'estmont. in the county of Cambria and State of Pennsylvania, have invented certain new and useful lu'iprmements in Blast Stove Apparatus; and we do hereby declare the following to be a full. clear, and exact description of the invention, such as will enable others skilled in the art to which tit appertains to make and use the same.

Our invention relates to apparatus adapted for use on blow-off valves of blaststoves, such as are connected with blast fur naccs for heating the air blast thereof.

One of the styles of stovesin question, known as a hot-bla'st-stove, consists of a substantially cylindrical shell of iron or steel with closed ends, lined w h. refractory material. and having refractory material disposed in cellular form throughout a considerable portion of its interior. Such hotblast-stoves are of large fapacity and ordinarily contain many thousand cubic feet of air or gases, although they may be of greater or less size, according to the requirements of the blast furnace.

In p "notice, the refractory material in the interior of stoves heated by the combustion of blast furnace gases, or in other manner, and after it has reached the required degree of temperature, the heating discontinued and the stove is then ready to heat the air-blast which is then ptlfittl therethrough and ordinarily heated to a temperature varying from nine hundred to fourteen hundred degrees Fahrenheit, or to other temperature as may be desired.

After the stove has been used in heating the blast for a certain time, the rcfmctory material cools down so that it no longer will give the required temperature to the air,

whcrupon the airblast is shut off this stove, and before heating it up again, the large volume of hot compressed air contained therein, must be discharged, or released. This air is under pressures of from ten to twenty-five pounds per square inch, or thereabout, and has heretofore been discharged through an ordinary valve and pipe, and produces a loud, roaring noise in issuing therefrom and also'carries with it a considerable amount of ore and other dust'which has been deposited in the stove from the blast furnace gases.

One of the principal objects of our invention is to eliminate the excessive noise that accompanies the blowing-off of a hot-blaststove, as above explained, as this noise is yery annoying to the workmen and other people in the neighborhood, but it is also dangerous around blast furnaces in the respect that when the air is escaping and making loud, vibrating noises, other sounds, signals instructions and conversation cannot be heard, thereby interrupting the regular operations and procedure during the time that said noise continues. In addition to this there are certain dangerous occurrences around blast furnaces that can only be detected by 'the noise warning given thereby. which cannot be heard when the loud noise from the blowing-01f of a hot-blaststove is being produced.

Another object of our invention is to prevent the excessive wear of the stove-valve parts, pipes and other fittings, due to the cutting effect of the ore and other dust that is blown out when the stove is emptied of its air, preparatory to its being heated again.

Still another object of our invention is to prevent the discharge of the dust particles into the atmosphere, to keep the bulk of them in the stove chamber, and to carry the hot, escaping air high enough to obviate danger from its heat.

lVith these objects in view, we have pr vided an apparatus thatv is simple and economical of construction and one that satisfactorily overcomes the objectionable features of the older practice above mentioned.

Although for simplicity of description and illustration we have referred to our appa 'atus as used with a l1ot-blast-stove of a blast. furnace, we do not limit ourselves to this application thereof. but we may utilize it in connection with the discharge of air, gases or fluids under any other circumstances where so desired.

We have demonstrated by recent actual construction and use that our apparatus performs the functions heretofore described, end eliminates noise, danger, dust, and reduces the cutting of the parts by dust consequent upon the blowing-off of air from a hot-b1ast-stove.

Referring now to the sheet of drawings {is eeasae forming part of this specification and in i 18 mounted in a shell or casing, constitutes which like characters of reference indicate like parts :-l igure l is avertical section of blow-o1? valve located near the bottom of a hot-hlast-stove and secured to the shell thereof, as shown; showing also a sectional longitudinal view of the lower part of our apparatus secured to the valve casing. Fig. 2 is a vertical central sectional view of our apparatus detached from the valve casing, for convenience of illustration. Fig. 3 is a transverse section taken on the linellI-Hl of Fig. 2 being in the direction of the arrows. Referring to the various characters of reference on the drawings 1 indicates the outer portion of a h0t-l last-stove showing the shell and refractory lining thereof; '2 is an annular base secured to the shell of a hot-hlastetove and conforming thereto, while 3 is an intermediate portion of a valve casing; l is the valve casing proper, having a seat formed thereon-as shown, in which the mushroom valve disk 5 is shown in its closed position, and 6 is'an annular flange extending around the outlet or. nozzle of the valve casin i The parts heretofore mentioned, with the exception of the flange 6, comprise the old blow-off arrangement hereinloe'lore referred to, and which, on account of the noise and.

other difficulties mentioned, has led to our improved apparatus, which is mounted thereon.

Our apparatus consists of -a shell orcasing of considerable length indicated as 9 on therewith, is the inlet pipe section'll provided with the perforations 12 and. the cap 13. Within the shell or casing f) and immediately above the inlet pipe section 11, is located a ballle which is composed of a lower hollow truncated cone 15 provided with an aperture 16 which aperture is of approximately the same diameter the inlet pipe section 11, the upper portion of said battle being composed of a reversely disposed, holtlow truncated cone 17 having a similar what we call one unit ol our construction, and in the illustration accompanying; this specification, another unit is l!( \';l1 above the perforated dial'vhrag'm it), although we may use any number of units as de.-ired, to accomplish the purpose intended.

Above the upper hollow cone 18 is located the inverted funnel 2O having a lower flange 22 whereby it secured to the shell or casing 9, and an upper flange 21 on which is mounted an upper perforated pipe section 23, provided with perforations 2-1 therein. The upper pipe section 23 is provided with a closing piece 25, and mounted on the upper end of the pipe 23 is an upright pcrforated funnel 26 having perforations '27 therein, through which latter the air or gases finally pass into the atmosphere. The space at the lower portion of our apparatus indicated by 28- we call the lower dead air or eddying space, while the spaces within the baille units indicated as 29 we call the expansion chamber. Similarly, the space 30 is the upper dead air or eddying space, and 31 is the upper chamber.

"We have indicated at 39 the ore or dust which is retained within'the chamber of the hot-blast-stove by reason of the operation of our apparatus.

In illustrating our invention we have shown the nozzle or valve casing located at an angle of about sixty degrees from the horizontal, although this is not essential, as it could extend vertically, horizontally, or in fact, might be inverted, if desired.

Although we may vary the proportions and dimensions of our apparatus, we have shown the inlet pipe 11, having perforations 12 about equal in combined cross wctional area to the cross section of the pipe itself, and the diameters of the openings l are substantially equal to the diameter of the pipe 11. i'tlthough'we may also vary the proportion of other parts oi" our apparatus, we have shown the-diaphragm 19 provided with perforations about equal in area. to the other openings, and the openings in the pipe and the funnel 26 are sin'iilar.

The operation of our apparatus is substantially as tollows:-'lhe hot-blaststove or otherapparatus being full of air, gases, etc, under pressure, the valve 5 is opened, and the fluids are thence discharged from the valve casing into the inlet pipe 11, thence out through the pcriprations 12 in small streams, thence issue into lower dead airspace 28, where, on account or the conformation, eddyinfzj action is occasioned, cierehy dissipating a portion of the en gy and lessening the velocity. The direction of the motion is then reversed by passingthrough the lower opening 16 into the lower expansion chamber 29 and eddies and countercurrents again are formed and the velocity is lowered by the expansion therein. The fluid then passes through the upper opening it; in the lower unit of theballle, impinges against the cap or hollow cone 18 and is again deflected downward and escapes into the space sur rounding the exterior of the cone 18 through the annular opening between the hollow conical frustum 17 and the conical cap 18, thereby again causing coui'itercurrents, dissipation of the energy and slackening of the velocity, due to expansion, friction, eddying action, etc. The fluid then percolates through the perforated diaphragm 15) into the. upper dead air space 30 and thence through the second bafiling unit, with results as heretofore described in connection with the first. battling unit through the annular space between the upper conical cap or deflector 18, passage is made into the inverted funnel 20, thence into the upper pipe section 23, thence through the perforations thereof, into the outer chamber 31, and finally through the perforations 27 in the upper upright funnel 26, the fluids issue into the atmosphere.

Although we have shown and described our apparatus with a hollow cylindrical casing, cylindrical pipes, and other portions of cylindrical cross section, we may make these of square, rectangular, oval or other forms, as may be expedient or desired.

For convenience of description and reference, the lower ends of the various portions of our apparatus are called the enteringends, and the upper portions the dischargeends, as our apparatus may be used in any position. Vi e may use more or less battles as desired, and in certain cases, may omit the upper parts, such as the upright perforated funnel, the upper pipe section 23 and the appurtenances thereof, as one or more bafiie units may suifice under certain conditions.

Although We have shown and described our invention in considerable detail, we do not wish to be limited to the exact and specific details shown and described. but may use such substitutions, modifications or equivalent-s thereof as are embraced within the scope of our invention and pointed out in the claims.

Having thus described our invention, what we claim and desire to secure by Letters- Patent is:

1. In apparatus of the character described, ahollow shell or casing, provided with inlet and outlet openings, one or more ballles within said shell, each baille comprising a pair of hollow conical frusta with their bases adjoining and secured together throughout the entire circumferences of said bases, thereby providing for the eddying and expansion of the fluids passed therethrough.

After leaving the second 2. In apparatus of the character described, a hollow, shell or casing provided with inlet and outlet openings, one or more battles mounted within said. casing, each ballle being composed of a pair of hollow conical frusta with their bases adjoining, the outlet frustum having a hollow conical cap secured at a slight distance tl'ierefrom, thereby providing for reversing the flow, the cddying and expansion of the lluids passed there-through.

3. In apparatus of the character described, a hollow shell or casing provided with a smaller inlet opening, one or more batlies within said shell, each batlie comprising a pair of hollow conical frusta with their bases adjoining, an inverted funnel secured beyond the ballles, a perforated outlet pipe connecting said funnel with the interior of said casing, and an upper upright perforated funnel secured to said casing through which the fluids finally pass to the atmosphere.

i. In apparatus of the character described, a hollow shell or casing provided with an inlet pipe of less diameter near the base thereof, a plurality of bafiies mounted within said casing, each ballle comprising a pair of hollow conical frusta with their bases adjoining, the discharge frustum of each pair being surmounted by a hollow conical cap secured at a slight distance therefrom, a perforated diaphragm between each of said battles, and an outlet opening beyond the discharge-ends of said battles.

5. Ii /apparatus of the character described, a hollow shell or casing provided with an inlet pipe of less diameter nea the base thereof, a plurality of batlies mounted within said casing. each bal'lie comprising a. pair of hollow conical frusta with their bases adjoining, the discharge frustum of each pair being surmounted by a hollow conical cap secured at a slight; distance therefrom, a perforated diaphragm between each of said bal'lies; a hollow inverted funnel mounted within said casing beyond said bailles, a perforated ,pipe of less dian'ieter than the casing, mounted between the discharge-end of said inverted funnel and an uprightperforated funnel mounted within said casing providing a final outlet for the fluid therefrom.

(1. The combination with the blow-oil" pipe and valve of a blasbstovc, of a hollow casing mounted thereon and provided with a perforated inlet pipe of less diameter than said blow-oil pipe a baliic mounted within said shell, composed of a pair o'l hollow conical frusta with their bases ad oining each other and said casing and surmounted by a hollow conical cap spaced apart from the discharge frustum ofsaid pair; a hollow perforated diaph *agm mounted within the casing beyond the discharge-end of the said battle; a second similar batlie mounted in said casing and beyond which a h llow inverted tunnel mounted within ol casing, the upper end of said funnel being connected with a pipe of smaller diam er than said casing, said pipe having perforations leading into the annular space around same, and a closure at its upper end, and an upright discharge funnel mounted Within said casing and provided with perforations connecting with the atmosphere.

"I An apparatus of the character described, comprising a hollow shell or casing provided with a perforated inletpipe of less diameter, a plurality of battles, each composed of a pair of hollow conical frusta, with their bases adjoining, the areas of the openings at their apices each being substantzally the same as that of the inlet pipe and the perforations thereof; a hollow cone mounted over the discha W frustum of said pair and spaced. apart from the same, a perforated diaphragm mounted within said casing. between each pair or battles, a hollow inverted funnel mounted within said shell beyond the last of said ballles, the upper end of said tunnel being connected with a pipe of smaller diameter than said casing. said pipe having perforations leading into the annular space around the same. and a closure at its upper end. an upright discharge funnel mounted Within said casing and provided with perforations connecting with the atoms pherc, the areas of the openings through each of said pipes, battles. perforated diaphi-aggro, funnel. etc, being s1ibstantialh equal and considerably less than the cross sectional area of the said shell or casing. thereby providing for the eddyingr. contraction and expansion of the fluidsv passed there-througir 8. An apparatus of the character dcscrihcd, comprising;- a hollow sh l or casing. having an inlet pipe of less diameter, said inlet pipe being provided. with an end closure, and side perforations approximately equal in areas to the. cross sectional area said pipe. a. series of battles mounted within said shell or casing, each battle being conr posed of a pair of oppositely dis wsed hollow conical frusta With their adjoining each other and the interior of said shell, the discharge trustiun 01 each pair being suru'iounted by a hollow conical cap spaced at. a. slight. distance therefrom, a perforated j.iaphragm secured within said shell bctween each pair of said l itiles. an inverted funnel mounted within the shell beyond. the

dischargeend ot the last battle, said funnel being connected with a perforated discharge pipe of less diameter than said shell or ing, the perforations therein conununicating with the annular space between said discharce pipe and said shall, a top closure for said discharge pipe and an upright perforated funnel mounted at or near the discharge-end of said shell or casing, the perforations of which funnel connect the interior with the atmosphere.

9. lhe combination with a blast-stove, of"

an apparatus mounted on the blow-off outlet thereof, comprising a tubular casing. in which is mounted a series of balllcs. so constructed and arranged that the fluids which pass through said apparatus are subjected to eddying and expansion. thereby lessening the energy and velocity thereof.

10. The combination with the blots-off outlet of a blast-stove, of an apparatus mounted thereon comprising a tubular casing of comparatively large cross-sectional area, an inlet of less area, the interior at said tubular casing being pro 'ided with a series of battles whereby the fluids passed there'through are subjected to eddying and expansion. thereby lessening the l velocity thereof.

11. The combination with a bl-- of an apparatus mounted on t n:

:. outlet thereof. com risin a tubular casino:

of. comparatively large cross-section 7 an inlet of less area. the interior of s a ..S inehavinq a series of baiiles mountco therein. so arranged as to provide contractions. expansions and tortuous arrangement of the space within said casing. waereby the r'luids passed there-through are subjected to eddying, expansion. and changes in direction of flow, thereby lessening the. energy and velocity thereof.

12. The combination, With a blast-stove. of an apparatus mounted on slow-oil outlet. thereof. comprising a t'ibu t and means therein for caui which pass thcrethrouggh to be sub eddying; and eXpansiouthereb v lessening the encrgrv and velocity thereof.

in testimony whereof we hereto atria our signatures in the presence of two f nesses.

i built] innn'r A. Buses.

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