US248925A - New toek - Google Patents

Description

(No Model.)

J. ELLIOTT.

BOILER FURNAGE.

Patented Nov. l, 1881E 1 r x H ll` Unirse Srarus Parana;

JAMES ELLIOTT, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR OF TWO- THIRDS TO ROBERT ARTHUR KELLOND, OF SAME PLAGE, AND HASGAL ALFRED HOGEL, OF YONKERS, NEW YORK.

BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 248,925, dated November 1, 1881.

Application filed April 15, 1881.

To all whom it may concern:

Be it known that I, JAMES ELLroTT, of the city and district of Montreal, in the Province ot' Quebec and Dominion of Canada, engineer, have invented a certain improvement which I believe to be new and useful in boiler-furnaces for the generation of steam and for other purposes. This improvement is fully set forth in the following specification and accompanying drawings.

The object of my invention is to save fuel inthe working of steam-boilers,and at the same time and by the same apparatus to obviate the nuisance of smoke issuing from the chimney. This I claim to `have accomplished in a more simple, economical, and efficient manner than heretofore by my improved apparatus, which consists in an arrangement whereby the air supplied to the furnace is heated previously to being introducedegpder the grate-bars;o and at the same time the unconsumed gases are drawn by means of a jet orjets ofsuperheated steam and hot air over the tire-barsVthe ordinary opening for the admission of erternal air under the grate being' tightly closed. I attain these objects by the mechanism illustrated in the accompanying drawings, in which- Figure lis an isometrical perspective sectional view as applied to an ordinary cylindrical boiler, in which certain parts are supposed to be removed in order to show more clearly the entire improved arrangement. Fig.2isatrans verse section through the fire-box. Figs. 3, 4, and 5 are external and sectional views of my improved furnace-door, and Fig. 6 the seit'- regulating tap.

The sameletters referto similarparts throughout the several views.

Letter Arepresents the boiler, B, the bridge at back of furnace; O, the gratebars; D, the ash-pit; E, end plate oi'boiler-furnace, all which parts are constructed in the ordinary manner.

The mouth ofthe ash-pit is provided with a door, F, which can be opened or closed at pleasure, but during the operation of my improved apparatus is kept tightly closed.

G G are iiues or, rather, air-passages built in the brick-work of the furnace-walls or rpnning along the same, one on each side, toward the (No modell) top and close alongside of the tirechamber, eX-v 5o tending toward the back end of the boiler, where they are connected by the outlet-s or openings a a with two similar return-dues or air-passages, H H, extending toward the front end, and having their ou tlets at b b, underneath the grate-bars. The outer ends of the passages Gr G are protected by adjustable sliding doors or dampers c, mounted on the front plate of the furnace-wall E, for the proper regulation of the amount of air admitted for the hot-air draft. 6o This draft is further assisted by placing aperforated pipe or channel, d, transversely in the passage leading from the furnace to the back ofthe boiler, and connecting thc same by t'wo lateral pipes, e e, running along the passages H H to the nozzles ff, which deliver the heated air, together with the unconsumed gases, from the rear end of the boilerinto the furnace over the gratebars. also introduce into the iiues or passages H Hthe steam-pipesg g, con- 7o necting at h It with the steam from the boiler, passing throughout the entire length of the passages H H, returning to the front, and connecting at the nozzles ff with the pipes e e. By this meansjets of highly-superheated steam are introduced over the ire, not only drawing and injecting the hot air and gases from the back of the boiler, but at the same time consuming the smoke before it leaves the furnace.

Another part ot' my improvement consists in 8o the employment of a hollow steam-heated furnace-door, J, which may be constructed as shown in Figs. 3, 4, 5, and 6. It is formed of iron plates, with sufficient space between to admit of an internal steam-pipe, j, made into a coil, so as to expose the greatest possible surface to the action of the heat from the furnace. It is connected at the hinge by a self-regulating tap or cock, k, to a pipe, l, from the boiler, so that when the furnace-door Jis closed steam 9o is admitted into the coilj, and when partially or fully opened it is cut off.- The upper end of the coil j is provided with one or more openings, m m, admitting the steam, after being superheated,into thefurnace over the fire, The outer shell of the furnace-door J, toward its lower side, is perforated with a number of holes, a a, admitting the external air, which is thus highly heated, both by the furnace and steamcoil j, and introduced, in combination with the jets of superheated steam, through the openings 'n 'n into the furnace over the lire, thus assisting in the saving of fuel and consumption of smoke effected by the other parts of my apparatus.

It will be seen that the lines H H serve a very useful purpose in protecting the pipes e and g from the burning action ot' the tire, besides elfecting their primary object of holding said pipes in such a position that the smoke in the pipes c and the steam passing through the pipes g may both become highly heated before being discharged into the tire-chamber.

My object in introducing the double tlucs Gr G and H H into my apparatus is to combine in the most feasible way means for covering and carrying the pipes c and g, as above mentioned, and at the same time heating the cold air brought in from the front of the furnace to a high temperature before discharging same under the grate-bars, and I lay no claim to any other arrangement.

I do not claim, broadly, the use of heated air or of superheated steam, either singly or in combination, for the economy of t'uel or consumption of smokein boiler-furnaces; nor do I herein claim, broadly, the method of drawing and injecting the waste products of combustion into the furnace for the some purposes; or of heating the air and superheating steam by the Waste heat of a furnace, because I am aware that all these features of invention have been previously in use in various forms; nor do I intend to limit the scope of my invention to the precise details herein described, and shown in the drawings, so long as the peculiar character of any part of my invention is tetained; but,

Having thus fully described the nature of my invention, What I claim as new, and desire to secure by Letters Patent, is as follows, viz:

1. In a furnace foi` generating steam or other purposes, a ue or passage made in two divisions, one above the other, and connected by passages near the back, the upper fiuc or division receiving cold air from outside the furnace, and the lower liuc discharging same in a heated condition underneath the grate, in combination with and serving to hold pipes conducting smoke and steam to a point over the grate, substantially as described.

2. A furnace-door inclosing a pipe or coil of pipes to which steam is admitted from the boiler, and from which iets are directed over the lire.

3. A furnace-door made hollow, receivinga coil of steam-pipes, and provided with openings on its outer face for the admission of cold air, and similar openings on its inner side for the discharge of said air in a heated condition over the tire.

4. In combination with a hollow furnacedoor receiving air from outside and discharging saine over the fire, a jet or jets of steam discharged simultaneously in the same direction, the supply being controlled by a self-acting cock or tap placed at the hinge of the door, all substantially as and for the purpose described.

. JAMES ELLIOTT.

Vitnesses:

CHARLES Renn, R. ARTHUR KELLOND.

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