US1629282A - Underfeed stoker - Google Patents

Description

May 17, 192?.

' 1,629,282 E. LU N DG R EN v UNDERFE'ED STOKER Filed April 19. 1925 2 Sheets-Sheet 1 A TTO NE YS 1,629 282 May 17 1927' E. LUNDGRl-:N

UNDERFEED ySTOKER Filled April 19, 1925 2 sheets-sheet 2 I N VEN TOR ATTORNE ifs lec i any iv, isa?.

EDWIN LUNDGREN, or FREDRICK, MARYLAND, Assrenoia To coiriBUstrIoir Elisi- NEERi-NG CORPORATION, or NEW Yognx, N. Y., A. conroaa'rion' or New Yoan.

UNDERFEED STOKER.

applica/aun mea april le, 1923. serial No. saaoes.

My invention relates to underfeed stokers and more particularly to underfeedstokers of' the inclined' multiple retort type.

rlhe principaobj'ctof the invention is to provide novel and improved means for controlling the admission of air to the air supplying surfaces of the underfeed section of stokei's of the type above indicated.

The following is a description of my invention, reference being had to the accompanying drawings, in which,-

Figure l is a longitudinal sectional View of a portion of an underfeed stoker embody-v ing the features of the invention in their preferred form; l

Fig. 2 is a transverse sectional view, on an enlarged scale, taken on the line 2-2 of Fig. 1; l

Fig. 3 is a longitudinal sectional view'of a portion of an underfeed Stoker having a modified form of means for controlling the supply of air to the'fuel supporting surfaces; Fig. 4 is a transverse sectional view, on an enlarged scale, taken on the line 4-4 of Fig. 3;,and

Fig. 5 is a p component part of 'the structure shown 1n Figs. 3 and 4. A

The Stoker illustrated in the drawings 1s provided with a plurality of downwardly iuclined fuel re'toits 2 and tuyre boxes 4 alternately arranged, and a wind box 6 located beneath the fuel retorts and tuyre boxes for supplying air to the tuyre boxes. lhe retorts 2 are each provided with a bottom wall 8 and vertical side walls 10, the .latter also constituting the side walls of'the tuyre boxes. The upper and loweredges of each of the side walls 10 are rovided with flanges 12 and 14, respective that project 1nwardly toward the centers of the tuyre boxes. A series of tuvre blocks 16 is supported on the-flanged upper edgesv of the l side walls 10 so as to form the tops of the tuyre boxes.A

In the fonstruction illustrated in Fig. 1, each tuyre box is provided with upper and lower end walls 18 and 20, respectively, and' with three transverse partitions 22 that divide the tuyre box into four compartments.

detail view in perspective of a side of the three upper compartments of each tiiy'ie` box, and the opening in the under side ofthe loweimost compartment is partially closedbyfa suitably .curved Wall vor baille plate 26. l It will be apparent thatvby varying the relative width of the. base portions of the partitions and the plate 26, the supply of air to the several .groups of tuyre blocks may be relativelyvaried as desired. One advantage of this provision for' controlling the supply of air to the several groups of tuyre blocks of each individual tuyre box is vthat dierent kinds of fuels'require dierent air supply under different parts ofthe fuel bed. For instance, when bituminous fuels are burned in a stoker of tlstype, a gradually decreasing air supply toward then rear end of the Stoker is desired, but when burning Waste fuels, such as coke breeze, or low grade fuels such as lignite, the opposite is 'desired Also this. construction permits individual control ofv air tov be secured lfor each tuyre 'box which is 'of particular advantage in relatively wide stokers.

As shown', the partitions 22 are removably mounted on the flanges 14 and are adapted vto be relatively adjusted longitudinally of -the flanges within certain limits, so as to vary the number of tuyre blocks in each .of said groups. To provide for this the base portions 24 of the partitions are provided with depending lugs 28 that are adapted to be received in a Series of notches 30 in each of the flanges 14. If desired, however, the partitions 22 may be cast integral with the side walls of the tuyre boxes.

The su ly of air to the di'erent groups of tuyre ocks may alsobe varied by means of transverse battles or air obstructing plates 32 that are removably mounted on the flanges 14 and are adapted to be adjusted longitudinally of the flanges by means of dedesirable in some cases when 'it is desired to adjust the partitions 22.

In theconstruction illustrated in Flgs,

4vand 5 of the drawings each tuyre box is.

provided with three partitions 36 that divide the box into four compartments that are similar to the compartments of the construction illustrated in Fig. l. The openings in the under sides of these compartments are partially closed by transverse baffle plates 38, and a sliding damper 40 is arranged to slide longitudinally along the under sides of the transverse plates 38. The damper 40 is provided with transverse portions 42 which are so positioned with relation to the bars 38 that when the damper is in its extreme lowermost position, as shown in Fig. 3 of the drawings, a greater supply of air will be admitted to the uppermost than to the lowermost compartment and that upon sliding the damper to its extreme upper position the opposite result is secured, `the supply of air to the intermediate compartments being varied accordingly. The .damper for each tuyre box is .adapted to be conveniently operated outside of the furnace, by means of a rack` 44 on the under side of each damper which is engaged by a pinion 46 on the inner end of a shaft 48 that extends through the outer wall .of the furnace and is provided with an operating crank 50 on its outer end.

In the constructionv illustrated in Fig. l the wind box is divided into two compartments by means of a transverse. partition 52 and air is separately supplied to these com partments through ducts 54, respectively, having controlling dampers 56. This construction permits a higher air pressure to be secured in the front compartment than in the rear or vice versa, air being supplied to the ducts 54 under different pressures.

As will be evident to thoseskilled in the art my invention permits of various modifications Without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

l. An underfeed stoker having, in combination, a plurality of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, and means for relatively varying the supply of air to different groups of tuyres of one tuyre box independently of the other tuyre boxes.

2. An underfeed Stoker having, in combination a plurality of downwardly inclined .fuel retorts and tuyre boxes alternately arranged, the tuyere boxes having fuel supporting tuyres, partit-ions dividing each tuyre box transversely into a pluralit of conxpartments, and means for relatively varying the supply of air to different compartments of one tuyre box independently ot' the other tuyre boxes.

3. An underfeed stoker having, in combination, a plurality of downwardly inclined fuel retorts and tuyre boxes alternately ar-v ranged, the tuyere boxes having fuel supporting tuyres, and means comprising partitions within each tuyre box for controlling the supply of air to different groups of tuyres, said partitions being adapted to be independently adjusted longitudinally of the tuyre boxes.

4. An underfeed Stoker having, in combination, acplurality of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, and means for controlling the supply of air to different groups of tuyres of each tuyre box independently of the other tuyre boxes comprising transverse partitions in each tuyre box, and air obstructing plates extending between longitudinal sides of each tuyre box and positioned between the partitions.

5. An underfeed stoker having, in combination, a plurality of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, and means for supplying air under different pressures to different groups of tuyres, respectively, of one tuyre box independently of the other tuyre boxes.

6. An underfeed stoker having, in combination, a plurality of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, partitions transversely arranged in each tuyre box dividing the tuyre box -into a plurality of compartments, a wind box located beneath the retorts and tuyre boxes for supplying air to the tuyres through openings in the under sides of said compartments, and means vfor relatively varying the size of said openings in said compartments so as to relatively vary the supply of air to said compartments of each tuyre box independently of the air supply to the other tuyre boxes.

7 An underfeed stoker having, in combination, a pluralityY of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, and means for controlling the supply of air to different groups of tuyres of each tuyre box comprising transverse partitions in each tuyre box having laterally extending air obstructingjbase portions, and air obstructing plates positioned between said partitions and removably mounted on the lower longitudinal edge portions of the longitudinal sides of said tuyre boxes.

8. An underfeed Stoker having, in combilll) llf

Leaaaea nation, a plurality of downwardly inclined fuel retorts and tuyre boxes alternately arranged, the tuyre boxes having fuel supporting tuyres, a transverse partition dividing each tuyre box into two compartments, a wind box beneath the retorts and tuyre boxes, a partition dividing the wind box into two compartments, the two compartments of each tuyre box being respectively in communication with the two compartments of said wind box, and means for establishing communication between said compartments of the wind box and separate sources of compressed air supply, respectively.

EDWIN LUNDGREN.

Images