US291518A - Hot-blast stove - Google Patents

Description

(NoqModel.) 3 Y Y 2 'Sheets-et `2. D. NQJONES.

HOT BLAST STOVE- No. 291,518l

l 'l C lV (e Q mi N5 @mfg To all whom t may concern:

i llrrnA A @rares A FarnNr 'rricnf nANrnL' N, `.roNn-S, on JonNSrowN,V PENNSYLVANIA.

H oT- BLAST sToVE.

SPECIFICATION forming part of Letters Patent No.' 291,518, dated January 8,1884.

i Application flied June 29,1551; (No nieder.)

Be it known that I, DANIEL N. JONES, of Johnstown, county of Cambria, State .of Pennsylvania, have invented or discovered a new and. useful Improvement `in Hot-Blast Ovens; and l do hereby declare the following to be 1 full, clear, concise, .andexact description therei of, reference being had to the accompanying drawings, making apart of this specification, in which-like letters indicating like parts-e Figurel, Sheet 1, is a vertical sectional elevation of one of the. chambers'of my improved oven, in the plane of theli'ne x, Fig. 2. Figi' i 2is a horizont-al sectionalview, partly in the plane of the line as x', partly in the `plane of the line x2 x2, and partly in the plane of the line m3 x3, of Fig. 1. Fig..3, Sheet 2, is a sectional view of the valve and valve-boxes (tol an enlarged scale) whichl employ, as presently to be described, said section being taken in the plane of the liney y of Fig. 5. Fig. 4L is a like view of the same in the plane of the line g/ y', Fig. 5; andFig. 5 is an end view of the valve-boxes, looking at the flat face of the valve as seen at the open end.

My present invention relates to certain improvements in the construction of `hot-blast ovens, wherein a moreuniform action ofthe heating agencies employed is secured, and the destruction of valves by the intense heat em ployed is more perfectly guarded against,`

while at the same time other minor details of improved construction facilitate the operations involved. Y

`lheregenerator principleof heating is employed, under which the ovens are built and used in pairs; but as each oven of apair is practically a duplicate ofthe otheiyl have deemed it necessary in the drawings to show shaft A?, built of lire-brick, or, along with the lining A', of other suitable refractorymate? rial capable of withstanding a high heat, so as the inner one, B, being the combustion-cham ber, and the outer one, which is of annular form, being `the regenerator-chamber. The

gdation, D, in which foundation are the pipes, ports, and conduits required for the work to bedone. A main conduit, D', is provided for the inflow.4 of gas and for the outgoing hot -blas't the gas being` introduced through a branch, DZ, from the blast-furnaces, waste-gas pipe,`or from any suitable gas producer or purifier, and thehot blast going out by the branch D3 to the tuyere or place of use.

One feature of my present invention relates to the valves and water-boxes employedin these branch pipes D2 D3, as well as in the chimney pipes, as will presently be described.

rlhe conduit D opens into the chamber B at ing the combustion of the gas is introduced through one or more air-doors, cl, into an airchamber, cl', from which one or more ports, d2, open into the lower end of the combustionsired number and size with reference to supplying air to the ingoing gas in proper amount and properly subdivided for effecting the combustion of the gas during its passage up the chamber B. When the direction of the current is reversed for heating the blast, these airsupply passages are to be closed in any suitable way, as by doors or valves.

` The chamber B is to be filled with open brick-work, supported on archesr, so as to leave beneath such arches an annular iiue, R, which opens, as at B', to the flue B2, which leads to the chimney. With this iiue R2 a cold'blast pipe, l?, makes a junction outside the oven, and avalve, c, of suitable construction, is arranged therein, so as to beclosed while the brick-work in chamber B' is being heated, and to be opened when theblast is to be heated. A hollow water-supplied butterjunction-point yof pipe l?, so as to be closed when the blast is being heated and opened when the brick-work of chamberl B. isiI being pit R4, may be added atA pleasure, with doors oven thus formed is built on any suitable foun` its lower end, and the air necessary for effectchamber B. These ports cl2 may be of any deily-valve, c, such as is hereinafter described,- is to be arranged in the flue B2, outside the `to divide the same into two chambers, B B',

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heated. Cleaning-ihres R3, leading to the dust- A i 2 :sanare or valves forv the usual purposes. Like clearing-flues may be added at other points, as desired or found necessary.

The action of the gas and air in heating and in being heated will be readily understood by those skilled in the art without further description.

The first important feature of the present invention relates to the height of the inclosing-wall A of the chamber B relative to the oven-top, whereby an annular throat, B2, will be formed of such area relative to the area in horizontal cross-section of the chamber B that the gases, heat, Src., coming up and going over, will be uniformly distributed all around thev upper end of the wall A2 and pass down through the brick-work in all pars of the chamber B. The throat thus opei'l'ites as a kind of choke or throttle to the flow oifras, &c., so thatinstead of allowing it or the bulk of it to follow the shortest line'to the exitflue, whichwould be in the line of the arrow w, the throat on that side being too small for such purpose, the narrowness of the throat will render it necessary for the gas, heat, &c., in o rder that the whole of it may get over, to pass over at all, or substantially at all, points in the throat, as indicated by the other arrows. In this wayl insure the distribution of the heat to all, or substantially all, parts of the brickwork filling, so as to take up and utilize the maximum amount of heat, and by uniformity of expansion and contraction increase correspondingly the durability of the oven; and as regards the reverse currents or the heating of the air for the hot blast, the same elements of utility will be secured. The air forced up through the heated brick-work inthe chamber B, instead of passing up chiefly on one side, following the shortest line from its en.- trance to the adjacent side of the throat B2, will be choked or throttled at that point, so as to be diffused throughout the heated brickwork in B, and be caused to pass over through the throat B2 at all, or substantially all, points.

Another feature of improvement relates to the valve and valve-boxes employed in the gas-inlet pipe D, the outgoing hot-blast pipe D3, and in the flue R2, leading to the chimney.

Such valves are shown at c t, Figs. l and 2, and the boxes at c c2,- but, for greater clearness of illustration, I have shown in Figs. 3 to 5 the devices referred tol to an enlarged scale. In the line of pipe communication-say in the pipe DZ-I arrange a butterfly-valve, c, suitably shaped around its periphery for seating neatly on the boxes, as illustrated. 0n account of the intense heat to which, in this use of it, it is subjected, Icast it hollow, as shown at c, and on a hollow stem, e', and at the ends of the stem make suitable connections for the supply and discharge of water to the inside of the valve, so as to prevent its destruction by heat. In order that it may seat tightly, it is vimportant that a metallic seat be provided, since a brick valve-seat will soon wear or be cut away; also, to get a tight seat, the valve,

seat to onehalf of the valve, and such inner wall may follow the curvature of periphery of the seated valve to a point-say r/ at or past the valve-center, on both sides, and through the rest of its annular length it may be made narrower and be lined with fire-brick, a2. The other water-box, c2, furnishes a valve-seat for the other half of the valve, and it has the same construction, except that the broad part of the box, the inner wall, n4, of which constitutes the'valveseat, extends around the other half or wing of the valve to a point-say at oe3-at or past the valve-center on both sides, and through the rest of its annular length may be narrowed and lined with fire-brick, n, as previously described. In this way I get good valve-seats properly protected, and with a minimum amount of area exposed to the peculiar action which variations of temperature have on cast-iron boxes. The usual waterpipe connections are of course to be added.

The filling in of brick-work in the chambers B may be of any desired style or pattern, that represented in Fig. 2 being preferred. The radial ribs r2 of this filling are built up on the radial arches which are over the flue R, and

the curved ribs r, in any desired number, follow substantially the form shown. These are so built as to leave openings of the desired size. Ihe central curved ribs are represented at r in Fig. l; but, as already stated, other forms or construction of lling may be emhence I do not desire to limit myself to exactv mathematical proportions; but in a general way it may be stated that the throat-area should not materially exceed the supply or re-v ceiving capacity of the chamber B, and for the best results should, by preference, be somewhat less, the laws regulating the flow of air and gases under pressure being also taken into consideration.

I am aware that hollow water-supply butteriy-valves seating against water-boxes, each having a metallic face extending around its entire periphery, are not new, and the same are hereby disclaimed.

I claim herein as my inventionl. In a cylindrical hot-blast oven having a central combustion-chamber, B, and a sur- IOO IIO

291,51s y Y s rounding regenerator-ohaniber, B', separated length and lined through the rest of its annuby a -dividing-wall, A2, the said Wall A eX- lar length, in combination With a hollow Watending up into proximity to the oven top or ter-supplied butterfly-Valve, substantially as cover, and forming a throat, B2, of about the set forth. I5

5 saine or less area than theV oombustion-oham- In testimony WhereofIhave hereunto set my ber, ,whereby the flow or passage of the airor hand. gas over the Wall A2 with practical uniformity on all sides is assured, substantially as set forth. DANIEL N JONES 2. The water-boxes c c2, having each a me- Witnesses: i 1o tallio Water-backed faoe extending half or a R. H. 'VHI'rTMsEY,

little more than half way around its annular GEORGE H. GHR1sTY.

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