US1527999A - Sawdust and like fine-fuel furnace - Google Patents

Description

1,527,999 A. l. THOMAS SAWDUST AND LIKE. FINE FUEL FURNACE Mar. 3, 1925.

Filed Jan. 1924 2 Sheets-Sheet 1 Alorzza Z 7720/7205,

@ZQM 6M attozwug Mar. 3, 1925. 1,527,999

A. l. THOMAS SAWDUST AND LIKE FINE FUEL FURNACE Filed'J'cn. '7, 1924 2 Sheets-Sheet 2 Alan Z0 J Thomas,

aftoz nu Patented Mar: 3, 1925.

PATENT OFFICE.-

.ALONZO IRVEN THOMAS, OF EUREKA, CALHORINIA.

SAW DUST AND LIKE FINE-FUEL FURNACE.

Application filed January 7, 1924. Serial No. 684,759.

To all whomt't may concern:

Be it known that I, ALoNzo I. THOMAS, a citizen of the United States, residing at Eureka, in the county of Humboldt and State of California, have invented certain new and useful Improvements in Sawdust and like Fine-Fuel Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings. ThlS 1nvent1on relates to a furnace primarily intendedfor burning saw dust and other. comminuted wood but also adapted to burn fine and low' grade fuels of various kinds.

One of the largest items of expense in connection with furnaces of the character indicated is that of burned out grate bars. Due

to the closely packed nature of the fuel it is difiicult to get air through grate bars of ordinary construction, particularly if the grate bars be close enough together to prevent the fine fuel from falling through. The result is that not only is it difiicult to maintain sufficient air supply to support combustion but, in addition, the grate bars rapidly burn out or become so warped as to render them useless.

In the Patent No. 1,410,141 issued to me on the 21st day of March 1922 I have disclosed a construction wherein the saw dust or otherfine fuel is burned upon what is substantially a solid bottom, air being forced into the fuel from suitable conduits.

In my copending application Serial Number 676,451, filed November 22, 1923, I have disclosed a furnace of the same general character as that illustrated in my patent but wherein certain economies of construction are brought-about and wherein the air discharging nozzles are bodily removable for ready replacement when they are burned out.

The present invention comprlses a furnace of the same general character as those shown in the patent and application above referred to but wherein the parts are so arranged that nothing about the furnace is likely to burn out. But, if it should burn out, the burned out part may be readily replaced at a very small cost. 3

The means. by which these objects are achieved are disclosed in the accompanying drawings wherein through a Fig.1 is a longitudinal sectional view art of a furnace illustrating a preferred orm of the invention;

Fig. 2 is a transverse sectional view through the furnace of Fig. 1;

Fig. 3 is a longitudinal sectional view illustrating a modified form of the inventron.

Fig. 4 is a transverse sectional view ihrough the form of furnace illustrated in Fig. 5 illustrates a housing of fire-brick or like refractory material having open sides adapted to receive tuyere irons hereinafter described;

Fig. 6 is a perspective view of a fire-brick hereinafter described; and

' Fig. 7 is a perspective view of a metallic plate constitutin a tuyere iron and adapted for use in the rnace illustrated in I Figs. 3 and 4.

Like numerals designate corresponding parts in all of the figures of the drawings.

In both forms of the invention, the fur nace comprises a hearth or base 5 which may be of concrete or any other suitable materiaL. Formed in this hearth are a plurality of longitudinally extending ducts. There may be any number of these ducts and they may be located in varying positions with respect to the side walls of the furnace. For

purposes of illustration I have illustrated two inner ducts 6 and two outer ducts 7. The

two outer ducts are connected by a trans-' verse cross-duct -8 which is supplied with air through a conduit 9 and the two inner ducts are supplied with air through a conduit 10 which leads to a well 11 which is common to both of the inner ducts. Where the base 5 is made: of a cheap and comparatively low grade concrete, I may, if desired, face its upper surface with a highly heat resisting fire-brick, indicated at 12 though I may dispense with this fire-brick and makethe base 5 of any-suitable heat resisting cement.

. In the form of the invention illustrated catedeat alongrth'e edges of the ducts 7 v being discharged from the ports as the fuel is'consumed.

By referring to 2 it will'be seenthat the material of the base uponwhieh the firebrick is supported is notched out as indiand these notched out portions receivethe lower edges of the bricks 16, hereinbefore described. Thus-these notched out portions constitute guides by which the bricks are caused to. "lieinj-accurate alignment with each other. and 'without' the necessity for other means for holding them in place. V-

Inth e form of the'invention illustrated in Figs. 3, 4, 5, and'7 the ducts 'Z are spanned by' .longitudinally .extendinghousings 17 the sides of which are open as indicated at 18,

I except that at suitable intervals supporting and strengthening ribs 19 are provided. This leaves comparatively long and wide openings in which 'theltuyere irons, indicated in Fig. 7 and numbered 20, are placed. These tuyere' irons have discharge ports21 formed in them through which air is disangle irons have openings formed in them corresponding with the port 21. The,

tuyere ironsor plates illustrated in Fig. 7 7

my be made in varying lengths. They maybe made quite short and. there may be a large. number of them or ,they maybe jmade longer and of a correspondingly less number. Since they are inlarge meas ure protected by being seated within the refractoly housing 17 .itfollows that they will notreadily burn out and if any. of them should burn out it is a simple matter to replace the burned out eiement or elements.

Thetsame thing is true with respect to the bricks illustrated in Fig. 6. Any one of these bricks" may be replaced without dis turbing any of the others, it being only n'ecessary to lift thefburned out bricli from its place and to set another brick in itsplace.

In Fig. '5 I have illustrated upstanding portions 12 constituting a limiting meansfor limiting the inward movement of the plate of Fig.7 at the lower edge of said plate and I have indicated downwardly extending ribs 17 for limiting inward movement of said plate at the upper edge'of the said plate. n

It is torbe understoodthat the invention isnot limited tohthe precise'c'onstrliction set forth but that it includes within its purview whatever changes fairly come within eitlier theterms or the spirit of the appendedclaims. .4 Having described 'niy invention what -I clairn is? 1. A furnace of the character'describ ed comprising a masonry base having aplurality of open ducts formed thereim means for supplying air to said ducts fromthe extenor of the furnace, and refractory hOllS1- I ings of inverted U shape in cross section.

having laterally open ports in their" side walls whih housings .span said ducts and are continuous throughout the length said ducts, the edgesof said housings beingseat ed along the edges of said du'cts. i

" 2. A furnace: of the character described comprising base. having,a plurality of open top ducts 'formed therein; means for supplying air to said ducts firom'the e x'te f rior of the furnace and a plurality ofhollow fire-brick of inverted U shape spanning said ducts and continuous throughout the length thereof; said bricks being placed to gether end',' to end to constitutehousings over said ducts, said bricks havinglaterally,

open ports in their side walls. a. 4 v V 3. A structure as ,r'ec'it'e'd in claim F 2 wherein'saidbrick have inclined tops:

4. A structure as recited claim-2 where in the base is recessed along said duets for the reception of the lower edgesof said brick.

5..A furnaceof the character described comprising a base of masonry havingFa plu rality of open top ducts formed therein, means for supplying air to said ducts" from the exterior of said'base, housings disposed ovLer said ducts and extend ng longitudi-- nally the'rofin an'imbr'oken line, said housings being formed of refractory material and having openingsiformed in. their side walls and metallic tuyere plates eated in' said openings. i

In testimony whereof hreilntofaifixfmv signature.

ALONZO litiEN *rrio A s.

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