US23958A - Improved apparatus for superheating steam - Google Patents

Description

N.PETERS, PHOTLITMOGRAPHER. WASHINGTON. D. Cl;

UNITED STAT-Es .PATENT OFFICE.

GEORGE A. STONE, OF ROXBURY, MASSACHUSETTS.

IIVIPROVED APPARATUS FOR S-UPERHEATING STEAM.

Specification forming part of Letters Patent No. 23,958, dated May 10, 1859.

. scriptiomtaken in connection with the draw ings, is a full, clear, and exact description thereof.

In the accompanying drawings, Figure l is an end elevation of a boiler with my apparatus applied thereto, and Fig. 2 is a section through the same on the line C D of Fig. l.

The nature of my invention consists in combining a steam-jet or its equivalent for increasing a draft with a superheating apparatus in which steam is heated by gaseous products'of construction or flame drawn out of the boiler-connections, furnaces, or flues by a proper pipe, and then returned again to the iues or connections, or to the open air, substantially as specified, the lcombination being such as is hereinafter described, for the purposes set forth.

My invention is applicable to all boilers that I know of or are in ordinary use, and may be arranged in a variety of ways. I have in the drawings shown it applied to a marine boiler of the tubular variety; and arranged in a convenient manner.

In the drawings, the lire-boxes or furnaces are shown at d d d, the back connection at b I), the tubes at c c c, the front connection at d d, the chimney or stack at ff, and the steam chimney or dome at g g, while the steampipe is represented at 7L 7L. A pipe or liuc, j j, is connected with the back connection at if., extends upward, and is branched into several tubes?v l, located inside of the steampipe, and these tubes enter into another pipe or fine, m, which passes into and connects with the chimney. By means of these flues and tubes there is an open continuous passage .from the back connection or chamber near the ire to the chimney or extension of the front connection farther from the iire, and a portion of t-he heated gases can pass freely through. such passage, heating as they flow along the steam contained in a chamber or the steam-pipe. By this means it will be perceived that the whole of the gaseous products of combustion are not brought into play, as

they usually are, to heat the steam, and, further, that by placing a valve in the iiuejj the amount of gases used for superheating may bein a measure regulated, or the gases altogether shut off and the steam used as generated; but it will be perceived that the passage through the superheating apparatus is longer than the direct passage through the tubes and connections of the boiler, and also less direct. Therefore there will never be such a flow of gas through the former as to heat the steam too much. Regulation, therefore, will be best attained by providing means to increase at will the iiow of gases through the superheating apparatus, and for this purpose I have located inside of the flue which connects with that part of the boiler farthest from the re a pipe, o, filled with a proper regulating valve or cock--such as p-and connected at one end with the steam-space of the boiler, while its other end is open into the flue, and thence through such iiue into the chimney. On opening the cock in this pipe steam will` pass through it, make a partial vacuum around and below the pipe, and in a manner well known to engineers generate a current, thus causing a greater iiow of gases through the superheating apparatus, and consequent] y the application of a greater amount of heat to the sieam to be superheated. By opening this cock to a greater or less extent the amount 'of heat applied for superheating can be regulated.

I do not confine myself to any precise number, form, or arrangement of tubes, nor to any precise points of connection of the ends of the superheating-tlues with the boiler, as such connection-s may be in any convenient place, so long as one end of the apparatus is connected at or near the fires and the other farther off; and I do not confine myself to an apparatus in which the steam is heated while passing through the steam-pipe, as a drum or chamber connected with the steam-space of the boiler might inclose the superheatingtubes; neither do I intend always to pass the gases inside of the tubes while the steam is outside, as the same result may be attained by using va large superheating-tlue with a steam-pipe or steam-pipes inclosed therein;

but in making' all such changes care must be taken that only a portion of the products of combustion come in Contact With the supe'rheating-surfaces, and that there be a pipe or passage independent of the usual boiler ilues, tubes, or connections, such pipe or passage acting to withdraw gases from their usual course and return them again, or else discharge them directly into the air; and also that there shall be in the discharging end of the pipe or passage a steam-jet such as is specified, so applied thatit shall When in use increase to a greater or less extent the draft through the passage, and consequently determine the amount of heat applied to superheat or dry the steam.

I intend to apply proper valves, self-acting or otherwise, to shut ott any portion of the superheating apparatus that may become leaky, and also to have a proper handle for altering the' position ot' the cock or stopvalve p.

I claim as of my own invention- A steam-jet, or the equivalent thereof, located substantially in the position and serving the purpose specified, in combination with a su p erh eatin g apparatus which is heated by a portion ofthe gaseous products of com bustion, and is otherwise substantially the same as hereinbefore set forth.

In testimony whereof I have hereunto subscribed my naine, in the city of Boston, this 2d day ot June, A. D. 1858.

-GEORGE A. STONE.

In presence of- N. G. LOMBARD, CHARLEs L. LovERING.

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