US736793A - Superheating apparatus. - Google Patents

Description

No. 736,793. PATENTED AUG. 18, 1903. M.- W. SEWALL.

SUPERHBATING APPARATUS.

APPLICATION FILED JUNE 6. 1902.

PATENTED AUG. 18, 1903.

M. W. SEWALL. SUPBRHEATING APPARATUS.

APPLICATION FILED JUNE 6, 1902.

2 SHEETS-SHEET 2.

No MODEL.

UNITED STATES Patented August 18, 1963.

MINOTT W. SEVALL, OF` ROSELLE, NEW JERSEY.

SUPERHEATING APPARATUS.

SPECIFICATION forming partof` Letters Patent No. 736,793, dated August 18,` 1903. Application tiled Tune 6, 1902. Serial No. 110,475. (No model.)

To wZZ whom it may concern:

Be it known that I, MINOTT W. SEWALL, a citizen of the United States, residing at Roselle, in the county of UnionV and State of New Jersey, have invented` certain newand useful Improvem'ents in Separately-Fired Superheating Apparatus, of which theifollowing is a specification, reference being had therein to the accompanying drawings.

This invention relates .to a separately-fired steam-superheatcr; and it consists, in combination therewith,of an attemperator arranged between the furnace and the superheater for the purpose of modifying the direct heat of the furnace upon the superheating-surfaces, a separator connected with the steam-supply, and an economizer located in the path of the escaping products of combustion forrevaporating any entrained waterin the steam from the generator.

In the accompanying-drawings an apparatus embodying my invention is shown detached from a steam-generator.

Figure 1 represents a side View with the economizer arranged above the superheater in the same vertical plane, and Fig. 2a side View with the economizer located on a horizontal plane with the furnace and attemperator.

In the respective views similar numerals of reference indicate corresponding parts.

1 is the furnace, 2 the superheater, and 3 the economizer.

4 is the attemperator, located between the furnace 1 and the superheater in the line of the course of the heated gases from the furnace, as shown. The attemperator is composed of two or more series of water-tubes 5, arranged across the top of the furnace and connected at their opposite ends to manifolds or water-boxes 6, which communicate by means of a series of interposed nipples 7, the upper manifold connecting with another manifold 8 at the front by means of a series of tubes 9 and at the rear to the steam and water drum 10 by a series of tubes 11. The

. drum 10 and front manifold 8 communicate the attemperator.

ofa series of tubes or nipples 14. The interior of the drum 10 is `provided with perforated partitions or baffles 15 to keep the circulating water in the drum practically separated from the steam-space and from the steam-inlet from the generator and steamries of tubes 19 and cross-box 2O at one end and with tubes 21 from said cross-boxwith the drum l0. The headers at the other end of the economizer communicate directly with the drum 10 through a series of tubes 22. A mud-drum 23 is also provided at the lower end of the economizer. The water circulation of the economizer is the same as 'through the attemperator, as indicated by the arrows in the respective figures. In the relative arrangement of the economi'zer shown in Fig. 1 a separate drum 24 is supplied.

The steam-outlet of the superheater is indicated by the numeral 25 in the respective iigures.

The course of the heated gases from the furnace to the chimney or -uptake is clearly indicated bythe curved arrows. The uptake 26 is' supplied .with a damper 27, andl the course of the gases is regulated by the partitions or baffles 28 in the usual way.

In the construction of the attemperator 4 only two rows of the tubes 5 are used, which are deemed sufficient for the purpose of this invention, this surface not being intended as a heating-surface for the generation of a steam-supply to the superheater, its proportion to the amount of grate -surface shown rendering it inadequate for such purposes, the superheating-surface being designed vapproximately in a ratio of iive to one of a steamgenerating surface.

The superheater 2 on account of its large comparative size will with the ordinary means of firing be sensitive to the iooding of the furnace with cold air during the pe#- IOO , the attemperator, as shown in Fig. 2.

:riod of working the fire, and to avoid this I have added devices to prevent the entrance of the air at such time. These devices consist of a hopper 29, through which the coal is fed, located below the connection-door 30 of the superheater, as shown in Fig. 1, or of The hopper` is provided near its base with a revolving feeder 31, having projecting blades 32 and a swinging gate 33, operated by the revolving feeder to close the base of the hopper during the feeding of the coal to the chute 34, leading to the furnace. The gate 33 above the feeder also serves to distribute the coal as the feeder revolves, and thus keeps the coal from lodging in the hopper. With this device the coal will be fed continuously and after coking at the front of the furnace may be spread over the grate 35 by suitable tools passed through small openings in the furnace-door 36, which are normally closed by hinged coverings 36 37 38. This feeding and {lire-regulating device is not claimed herein, but is reserved for the subject-matter of a separate application.

,The operation of the apparatus will be readily understood from the foregoing description and inspection of the drawings, the attemperator and economizer being kept supplied with Water by suitable feed connections (shown in the drum 10, Figs. l and 2) and by an independent or connected feed in the drum of the economizer, as shown in Fig. 1, the circulation following the direction shown the combination therewith of a separator con-` nectedwith the steam-supply, an attemperator in circulatory communication therewith, and an economizer located in the course of the escaping products of combustion.

3. In a separatelyred steam-superheater, the combination therewith of a separator connected with the steam-supply, an attemperator in vcirculatory communication with the separator and an economizer also in circulatory communication with the separator, all located in the course of the escaping products of combustion.

In testimony whereof I afx my signature in presence of two Witnesses.

MINOTT W. SEWALL.

Witnesses:

CHAs. W. FORBES, CHARLES HANIMANN.

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