US958971A

US958971A - Forced-draft-furnace grate.

Info

Publication number: US958971A
Application number: US47340409A
Authority: US
Inventors: William Howard Palmer
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-01-21
Filing date: 1909-01-21
Publication date: 1910-05-24
Anticipated expiration: 1927-05-24

Description

W. H. PALMER.

FORGED DRAFT FURNACE GRATE.

APPLIOATION FILED JAN. 21', 1909.

958,971 I Patented May 24, 1910.

2 sums-sum 1.

' W. H. PALMER.

FORCED DRAFT FURNACE GRATE.

APYLIOATION FILED JAN. 21, 1909.

Patent May 24, mm.

2 SHEETS-SHEET Z.

mmnroz (run STATES Par s curios.

WILLIAM HOWARD PALMER, OF FORT SCOTT, KANSAS.

liORCED-DBAFT-FURNACE GIBATE.

Specification 011' Letters retest.

Patented May 24:, 319th.

Application filed January 21, 1909. Serial No. 478,404.

nres in construction and in combinations and. arran 'ei'nents of parts and formations as more i'uhy and particularly set forth herein W to the accompanying drawl, is a cross section through a furnace bed or grate constructed since with my invention. Fig. 2, is n View of a grate bar thereof. Fig. ide elevation of one of the grate bars a. l .g. l, is a vertical longitudinal- Figs.

nrough a portion of said bar.

are detail views of the rings and of he air blast outlets. vie s illustrating a modified formation openings and plates.

improved furnace bed or grate is pary' intended to receive fuel in a finely rate such as slack or the like and to end is constructed without openings or therethrough except for blasts of "ly' upward into the fuel on the bed. is what might be termed closed or a, .lntESlllllCll as no openings or spaces are provided through which fuel can drop or escape, the object being to necessitate comhustion of all fuel introduced into the furonto the grate as the iuel cannot escape l I tuel was introduced. To this end I form tile ru rnace bed or grate of a suitable number oi spaced and usually parallel hollow Figs. 7 and 8 t by the door opening through whichgrate bars (generally indicatedby 1, in Fig. 1,) and intervening packing and supporting means throughoutthe bed completely 'clos ing the spaces between the grate bars, and su orting the rate bars.

. ollow grate %fil' carrying ledges or other suitable su ports are provided along the furnace wa ls surrounding the furnace bed or rate, and at intermediate points between sai walls. For instance in the particular example illustrated, I show parallel i i-beams 2, horizontally arranged within the furnace and at their ends supported by opposite fur-- nace walls or in any other suitalne manner.

These beams can extend longitudinally of the furnace, that is, from the front to the rear thereof, and such distance apart that the rate bars canrest on the beams and dc pen between the same and preferably so that each intermediate beam will receive and partially carry two grate bars.

The spaces between the upper portions of the grate bars are closed and filled in by suitable packing material such for instance as refractory material and to this end, l show them other bricks or refractory material blocks 3, laid transversely of the spaces between the grate bars'and a fine packing 4., of suitable sand closing interstices between the bricks and the bars and covering the bricks about to the level of the top faces of the grate bars. It will hence be observed that the gratebars are stationary or fixed, and the grate or furnace bed as an entirety is fixed or stationary and the closed top surface thereof is made up of the top faces of the rate bars and the intervening surfaces 0? packing or filling material so that it is not ossible for fuel to waste by drop- "ping or allingthrough said furnace grate,

or bed.

' Each grate bar is longitudinally hollow and is normally closed except for the blast or compressed air inlet and the top blast outlet openings. Each bar is preferably composed of two longitudinal sections, the lower or supporting section 5, and the upper or fuel supporting section 6. The lower section is usually composed of a longitudinal trough-like casting 0 so at the top and closed at the ends, si es and bottom and with its sides inclining or converging toward the list bottom wall. This lower section is formed with an internal horizbntal supporting seator ledge 50, along the inner faces Oil its sides and ends and a comparatively short distance below the fiat top edges 51, of. its sides and ends. The lower section is also formed with an exterior horizontal projecting supporting flange or ledge 52,

extending along the opposite sides and ends with the ledge 52, at the ends of the bar resting on supports at the front and rear furnace walls. The lower section is formed at one end with a depending nipple or other connection 53, to receive the blast pipe or other sourceof compressed air for delivery to the grate bar. also be formed with a series of vertical ash discharge holes or perforations 54, drilled through the flat floor of the section and normally closed by a fiat slide 55, arranged longitudinally within and resting on the floor of the section and allowed a limited longitudinal movement therein to close said openings or to bring them into alinement or re istration with corresponding openings 56 through the slide for the purposes hereinafter explained. This slide can be confined and limited in its movement by bolt 56, passing through longitudinal slot 57. The slide can be reciprocated through the medium of its perforated lug 58, depending through slot 59.

The top or fuel supporting section 6, of the grate bar is usually formed by a casting in the shape of an inverted trough open at the bottom and having a top wall, and closed side and end walls. The side walls and end walls are vertical and usually parallel respectively. upper section is formed to slip or fit down into the open upper end of the lower or supporting section until its lower edge seats on the internal supporting ledge 50 of the 'lower section, whereby the top section. is

supported and upheld. An eirterior air tight joint 60, can be formed between the sections by introducing cement between the overlapping outer surfaces of the upper section and inner surfaces of the lower sec-- tion above the seat 50, whereby the two sections are secured. together to form the hol low bar.

A longitudinal series of separate and spaced air blast slits or openings are formed through the flat top wall of the grate bar and each opening is formed upwardly flan,

ing by a surrounding downwardly and inwardly beveled edge 61, and each open-ing is centrally or diametrically bridged by a depressed horizontal narrow bar or web in these openings, I. arrange suitable plates The lower section can The lower side of this.

eeaen tied down to the webs 62, by bolts 63, arranged centrally within the plates and openings. For instance, in the round openings, I show a removable ring 64, having a beveled edge corresponding generally to the edge 61, and formed with edge stop points (55, to engage edge 61, so that when the ring is placed in the opening with the top face of the ring about flush with the top face of the grate bar, a narrow annular slit for discharge of air will be formed between edge 61, and the beveled edge of the ring. A separate removable cap 66, can be provided. for each ring to close the open center of the ring except for intervening slits 67, for discharge of air between the cap and inner edge of the ring. The cap is provided with radial lugs 68, overlapping the ring and removably fitting in sockets depressed in the top face of the ring, to hold the same down in position. tral depending boss or stop 69, resting on the top face of the web (32. The bolt 63 passes centrally and removably through the cap and web 69., to hold or clamp the cap down to the web. If so desired, the grate bar top can be formed with a series of spaced parallel elongated openings arranged transversely of the bar top provided with elongated beveled-edge removable plates-70, flush with the bar top and forming the slits 71, around the plates and between their edges and the beveled edges cf the openings, each plate having a cein' ral depending stop boss 72, resting on the web 32, bridging the opening, and a removable central vertical confining bolt 73, passing through the plate, boss and web to hold the plate down to its operative position.

In the event that line ash or other dust should drop through the slits and accumulate in the hollow grate bars, any suitable hooked-end poker or other manually operated instrument can be inserted through the furnace front and beneath the grate and successively engage with the perforated lugs 58, to successively reciprocate the cleaner plates or slides 55, on the grate bar floors. I holes 547, 56, will be periodically brought into registration, whereupon the compressed air in the grate bars will expel the dust and ashes downwardly through said holes into .the ash pit of the furnace below the grate.

In the preferred formation of grate or furnace bed shown by Fig. 1, each grate bar is supported. by two beams 2-, and the fiat top head of each beam receives side supporting flanges 52, of two adjacent bars so that the beam closes the space above the beam and between the grate bars iroin the space below the furnace bed, and the filling bricks '3, are laid transversely between the grate bars and on and upheld by the exterior ledges 51 of the ad acent bars, a distance The cap is formed with a cen-.

As said slides are reciprocated the seam above 52, and the beams 2. By this arrangement the beams 2, are insulated and protected from the heat of the furnace not only by the bricks 3, and packing a, but

, also if so desired by dead air space 20. Any grate bar can he removed for repair or otherpurpose by removing the adjacent bricks and packing supported thereby 'and then lifting the bar: from the beams without disturbing the remaining bars and bricks and.

paclri ng.

It is evident that various changes might, 'be resorted to in the forms, constructions and arrangements of theparts described and hence I do not wish to limit myself to the exact construction disclosed.

l. A forced-draft furnace bed comprising supporting beams, ,hollow grate bars parallel with and between and resting on said beams and extending upwardly above the horizontalplane of said beams and having top forced-draft outlets and filling material between said bars and closing the spaces above said beams and between the bars.

2A forced-draft furnace grate comprising spaced supporting beams, hollow grate bars parallel therewith and havingintermediate' flanges resting on said beams, said bars having top draft outlets and side ledges, and bricks in the spaces between said bars above said beams and supported by said ledges.

3. A hollow grate bar for a forced-draft furnace bed having top draft outlets and horizontal exterior opposite side flanges, and

bricl'c supportingledges above'saicl flanges.

i. it hollow grate bar having top air discharge openings, and throughout the length of its sides provided with longitudinal ledges for supporting filling material for closing the spaces between ad acent bars, and with longitudinal bar supporting portions, substantially as described.

5. A forced-draft furnace bed closed against the downward passage of'fuel therethrough and comprising parallel spaced hollow grate bars having top air outlets,-

supporting beams arranged longitudinally of and'parailel with and between said bars, and removable refractory material filling laid between said bars and above said beams to close the spaces between said bars.

63, A furnace bed comprising spaced suppor l,- is, l'ioil s grate bars ail; d longitudinally between. said beams and pro jecting above the plane of the beams and having top air outlets and longitudinal side flanges resting on the beams and upholding the bars, and fuel-supporting means closing the spaces above said beam and flanges and between the top portions of sa d bars.

7. A closed forced-draft furnace bed com- .prising grate bar supporting beams, series of hol ow grate. bars arranged between and resting longitudinally on said beams and having air outlets in their top fuel-support-- ing faces, said bars having side supporting ledges arranged above said beams and below their upper ends, and fuel supporting mate-- rial closing the spaccs ctween the top por tions of the bars and supported by said ledges.

8. A closed .forced.dra ft furnace bed com-- prising spacedsupporting beams, hollow grate bars having top air outlets, said bars resting on said beams and arranged between thesame and provided with side supporting portions adapted to uphold fuel supporting means, and fuelsupporting means closing the spaces between the bars and above the beams and forming dead air spaces above the beams and below the filling material, substantially as described.

9. A forced-draftfurnace bed comprising ,spaced hollow grate bars having top air outlets and side supporting ledges bQlOW the horizontal plane of their upper ends, and bricks arranged in the spaces between t bars and laid on said ledges, substantialiy as described.

19. A hollow forceddraft grate bar ha ing top air outlets and provided. along its longitudinal sides with filling material-sun; porting'ledges, said bar formed of longitudinal sections fitted one within the other with their adjacent walls spaced apart to form an exterior cement receiving socket between the interfitting portions of the sec-- tions.

11. A closed forced-draft furnace bed comprising in combination, spaced hollow bars provided with top air discha openings, supporting bea. is arranged n tween and parallel with. said bars a 2.. the tops thereof, and filling material arranged between top portions of said ba and above and spaced from said bee thereby forming air spaces between the b in and above the beams and beneath said filling material.

12. A closed furnace bed comprising ries of spaced parallel hollow gratei: provided with top air discharge openii filling material closing, the spaces betwei 1 said bars and resting on and supported l) the bars, and packing material laid thereo between the tops of the b as ties Y ed forced draft furnace bed comprising an combination,

spaced supporting' beams, hollow grate bars having top air discharge openings, said bars restingon arranged between, and parallel with s "i beams, and series of bricks spanning the spaces between th-e bars and above th beams.

M. A forccddraft furnace bed compr ing in combination, spaced hollow g bars having top air discharge openi enfl lls anal on open hol the open top of 35 e- -";oni seciion receiving she open botixon top section lo form the co1n- 'gvlele hollow hen emu. ssh vino; trough having meui'is for (liscnsrging' Lslies therelron. H

18. combinatimi, in s forceclwlrsfl; furinure heal, series of hollow grate burs each consisting; of two longitudinal sections. one of which is open at the top and forms an ash receiving trough provided with means for removing ushcs from the interior thereof and the other section being hollow and open vi lhe boztom and having 1" approximately lint lop fuel supporting wall provided with an blast openings and also ffillne il with Yfil' fllll side and end walls, snel fuel supso porting means closing the spaces between the vertical side nulls of top sections of scliiureul grate bars, the upper section of each grate has being carried by the lower section shereof and as its lower edges litteil 5 therein. y it 1.. u; orced-(leafs furnace bed comprising in combination, sunporting beams, spscccl hollow grate bsirs arranged between and longitudinally of s ul beams" and each 40 consis'ning oi :1 ion al bottom seccion having ex'licirioc i iions 'i'esiingg on two adjucent beams and a longiiuclinul top section haying" on cliscliui' e openings in lop wail" soul top section extending above said e5 lower section and 21%; its lower portion fitted to said lower section and filling material arranged between the top scciions of the mljscc l hers and shove the lower sections of iihe zuijscen burs.

c0 18. A ,ruie l. for a forced-draft its top well formed with ins-s and with e rigicl on lily on under across ouch o ening, i u rg u'o inalely closnm nil siscl'nii'ge slits to QXAQ'HQG said meets 1o Sllhl IE rleuenuino- 1 i boils conhnu on soul top portions of the bars, substantially as described.

In combination, in s forced-draft furnace bccl, series of supporting bcams series of hollow rate bars carried. by said beams, the beams ceing arranged in the spaces between she bars with the bars extending above the horizontal plane of the beams, fuel supporting means arranged between. lhe

upper portions of the bars and closing the bur eoznposeil olf upper and lower longitudi nul sections, the botion'i section having an uuobslructecl interior and forming an ash TBCQlVlEI trough provided with means for the discharge of ashes therefrom snii having exterior siclo flanges, the top section comprising sshi flss'top wall and being fitted in and carried by said bottom section.

22. A. foirceil draft furnace bed having approximately flat level fuel supporting surfaces closing ihe bed against clown. draft and fuel passage therethrough and comprising a hollow grate bar having a fist top fuel supporting well formed with upwardly fluring air discharge slits and otherwise closed, said ban.- composed of upper and lowcilongitudinal sections, the bottom section forming on ssh receiving trough having spaced ash discharge openings through. llTS floor, a slide on said floor and normally closing said openings and having holes adopted to register therewith for the discharge of ashes from solid trough, and mesh; tqleucling to the exterior of the trough whereby said slii'le can be reciprocat the section 23: A ones draft furnace boil having approximately fie; level fuel supporting surfaces closing "1c beo against clown (inv t nncl fuel possess re'through and. coinpi' O l e be? lisvin a list to :mel.

mil forinecl with air elischsrge or composed of uppes and lower (l secions the bottom seclion bs iiuctecl interim and formtrongh normally closing said securing said plates to said a said bottom sectio 24. A hollow grate bar for a forced draft furnace bed having a flat top fuel supporting wall formed with spaced openings, fiat platesfitted in said openin s and in con: junction with the edges of the wall around said openings forming air discharge slits, said top wallhaving portions bridging said openings close beneath said plates, means portions and thereby leaving the interior of obstructed, said bar formed in longitudinal sections, the bottom section formin an ash receiving trough and provided witi means for the discharge of ashes therefrom, the top section comprising said Wall and being fitted to the bottom section. V

25. A hollow grate bar for a forced draft said bar un furnace bed closed against downward passage of fuel therethrough, said bar having a at top fuel supporting Wall formed with air discharge slits, and composed of longitudinal. sections, the bottom section supporting the upper section and forming an ash receiving trough having an ash (118- I charge opening and means normally closing the same, the top section comprising said top Wall and at its lower portion fitted in the upper portion ofsaid bottom section, the adjacent walls of said sections sp to form an exterior cement receiving socket between the interfitting portions of the sections, substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses.

WILLIAM HOWARD PALMER. Witnesses:

JAMES M. HUMPHREY, GRACE E. STONER.

aced apart