US1842188A - Underfeed stoker - Google Patents

Description

R. B. MILDON 'UNDERPEED sToKER Filed Feb.

Jan. 19, 1932.

21, 1930 2 Sheets-$heet 1 .n .ASM

INVENTOR Regincd Emmen.

QIl l ATTORNEY no. FURNAGES Wm W M Jan. 19, 1932. n. a. MlLnoN 1.842.188

UNDERFBBD STOKER med Feb. 21, 1930 z sheets-sheet 2 .N nur.. l..

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WITNESS Patented Jan. 19, 1932 UNITED STATES PATENT OFFICE REGINALD B. MILDON, F LANSDOWNE, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AN'D MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA UNDERFEED STOKER Application led February 21, 1930. Serial No. 430,362.

My invention relates to progressive feed stokers, and more particularly to the multiple retort underfeed t-ype. At the present time,

' all stokers of this type, of which I have knowledge, are so constructed that the tuyre rows are supported by the retort side walls.

The object of my invention is to support the tuyre rows by means independent of the retort side walls, the supporting means being below the tuyre rows and not in contactl with the fuel. My invention contributes the following advantages to a stoker:

1. Permits relative movement of the parts due to unequal expansion.

2. Facilitates repair and replacement.

3. Localizes trouble in the retort in case the retort walls are burned.

This and other objects are effected by my invention, as will be apparent from the following description and claims taken in connection with the accompanying drawings,

forming a part of this application, in which:

Fig. 1 is a longitudinal sectional view of stolzer apparatus constructed in accordance with my invention, the View being taken on the section line I-I of Fig. 2;

Fig. 2 is a fragmentary plan view of the apparatus shown in Fig. 1, certain parts being removed to illust-rate detail construction;

Fig. 3 is an enlarged fragmentary sectional view taken on the line III-III of Fig. 1; and,

Fig. 4 is a fragmentary sectional view taken on the line IV-IV of Fig. 1 and illustrating the details of the structure at the lower end of the stoker.

According to a preferred embodiment of my invention which is shown on the accompanying drawings, I provide a multiplerctort underfeed stoker having alternatelyarranged retorts and tuyere rows wherein the tuyres are supported by means located between walls of adjacentretorts and independently of the latter.

Referring now in detail to the construction illustrated, I show, by way of example, a pair of spaced, parallel I-beams 10 and 11 disposed transversely beneath the front and rear, respectively, of a multiple-retort underfeed stoker 12. The beams 10 and 11 form the plates 20 to the angles 15.

main supporting structure for the stoker. The stoker comprises alternately-disposed parallel retorts 13 and rows of tuyres 14 and consist in general of two parts: (l) a steel frame out of contact with the fuel bed, and (2) a cast iron fuel-supporting grate formed in sections and detachably secured to the steel frame.

The steel frame comprises pairs of spaced, parallel angle beam members 15 and I-beam members 16 parallel to the beams 15 and so arranged that one of the I-beam members 16 is disposed between adjacent pairs of angle beam members 15. The beam members 15 and 16 are secured at their front and rear to castings 17 and 18, respectively, which latter are supported by the I-beams 10 and 11.

The length of the castings 17 and 18 determine the width of the retorts. The castings 17 are disposed in abutting side-by-side relation and are bolted to the I-beam 10. The castings 18 are also disposed in side-by-side relation, but are free to slide upon the lower I-beam 11, soas to permit longitudinal expansion of the stoker.

The fuel-supporting surface or combustion grate is formed by the walls of the retort and the tuyres. These parts are made of cast iron and are sectional so as to resist the heat of the furnace and to permit the ready assembly and replacement thereof.

A plurality of upright cast iron plates 20 are bolted to the vertical sides of each angle member 15 and form sectional side walls for the retorts. The ends of adjacent plates 20 forming each side wall are secured together by clamping plates 21 and bolts 22, the lower ones of the bolts 22 serving also to secure the The bottom wall of each of the retorts is formed by plates 23 disposed between the side walls thereof. The bottom walls may be supported directly by the retort side walls. Preferably, however, such bottom walls are supported by cast iron blocks 24 which are bolted to the lateral flanges of the pairs of angle members.

Supported by the upper face of the I-beams 16 are one or more elongate rectangular castings 25 comprising a bottom plate 26 bolted to the beam 16, parallel side pieces 27 and cross pieces 28 connecting the side pieces to the bottom plate. Tuyres 29 are disposed in overlapping relation to one another and are supported directly by the side pieces ZT of the rectangular castings :25. The tuyres 29 are provided with lugs 30 which engage lugs 31 formed on the inner sides of the side pieces '27. rIhe tuyres are also provided with depending lugs 32. which fit within slots 3S provided on adjacent tuyres. 'l`he coaeting lugs and 3l, and the lugs 82 and slots 33 serve to hold the tuyeres in proper assembled relation.

By reason of the fact that the retort side walls are constructed in several sections and are bolted to a supporting frame structure, and the tuyeres' are carried by separate and independent supporting frame structures, all of the parts exposed to the fire are permitted to expand and contract relative to one another. Also by reason of this construct-ion, the retort side and bottom walls may be removed without disturbing the rows of tuyeres. This latter is especially advantageous from the viewpoint of maintenance for the reason that in the prior art construction, it was necessary to remove the tuyres before removing the retort side wall.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications without departing from the spirit thereof, and I, therefore, desire that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

lVhat I claim is:

l. In a stoker formed of parallel and alternately-disposed rows oftuyres and retorts, the combinationbi:r a supporting means; plates secured to the supporting means to form retort side walls; a second supporting means; and tuyres bridging the distance between the side walls of adjacent retorts and supported solely by said second supporting means.

2. In a stoker formed of parallel and alternately-disposed rows of tuyeres and retorts. the combination of a supporting structure arranged out of contact with the fuel: plates secured to tbe supporting structure and forming sectional side walls of the retorts; a second supporting structure also arranged out of direct contact with the fuel: tuveres bridging the distance between the side walls of adjacent retorts and supported solely by said second supporting structure.

3. In a furnace, the combination of a supporting structure disposed transversely of the furnace and adjacent one wall thereof; a second supporting structure disposed in spaced, parallel relation to the first supporting structure and at a lower level; and a downwardly-inclined multiple-retort underfeed stoker carried by the two supporting structureswan'd" comprising a plurality of pairs of spaced, substantially parallel beam members carried by the two supporting structures, other beam members parallel to the pairs of beam members and also carried by the supporting structures and arranged so that at least one of said other beam members is disposed between adjacent pairs of the lirst-named beam members, a plurality of upright plates detachably secured to each of the first-named beam members to form sectional retort side walls, means disposed between alternate adjacentretort side walls and providing bottoms for the retorts, and tuyre structures bridging the entire space between the side walls of adjacent retorts and supported solely by said other beam members whereby the side walls of the retorts may be inserted and removed without disturbing the tuyre structures.

4. In a Stoker, the combination of a first supporting structure, upright plates carried by said supporting structure to form parallel spaced ret-ort side walls, bottom forming members disposed between alternate adjacent pairs of retort side walls, a second supporting structure, and a series of tuyre plates bridging the space between each of the remaining pairs of retort side walls and carried entirely by said second supporting structure, whereby the retort side wall may be removed without disturbing the tnyres.

5. In a stoker, the combination of a stationary iirst supporting structure, upright plates detachably secured to said structure to form stationary, parallel, and spaced retort side walls, bottom forming members disposed between alternate adjacent pairs of retort side walls, a second stationary supporting struc-` ture, and a series of tuyre plates bridging the space between each of the remaining pairs of retort side walls and detaehably secured and supported entirely by said second supporting structure, whereby the retort side walls may be removed without disturbing the tuyres.

In testimony whereof, I have hereunto subscribed my name this 17th day of Feb.,

REGINALD B. MILDON.

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