US1845253A - Hot blast stove - Google Patents

Description

Feb. 16, 1932. w. EATONET'AL HOT BLAST STOVE Filed Sept 9, 1929 16 2 J5 A v Patented Feb. 16, 1932 UNITED -WYMAN EATON AND nnnswomn .r. ms'roo'rrr; or .crncneo,.innmors,.nssroiwons'mo VZEREYNI-ENGINEERINGV 'COMPANY, "OERCHICAGO,ILLINOIS, [A conronn'rron'oni menu:

gn igrns'r smovn p 'lpplication' file'dSeptember 9, 1929.? seri l No." 391,188;

" Our invention relates to 'hotblast stoves, and has particular reference :to-a hot-blast stove which may be built from J "old -js'tove or from one already in service, which' hasja chimney atthe top of thesh'ell, of which there are-a great many "types. 3 The stove may built new if desired; although it ki s" designed primarily of a "form into which stoves already in service may be converted without tearing jdown the entire shell' and 5 structure of the present stoves; Y i f V An object ofthe-present invention is the provision ofa hot'blaststovehavinga large 1 heating surface in' the regenerating chambers, which is necessarydn the modern type of stove in order to conserve the heatunitsand also to heat 'theblast properly when the "stove is-on' blast. i

c A-great many" hot blast stoves are nowin use which have bee1r1n serv1ce-f0r alGOnSldj erable period of time. 'Many* improvements have been-made in recent year-sin the ch ckerwork used in "regenerativechambers of 7 these "stoves, and, as is Wll' known, checker workrequires a t'tention *frequently in -order to: allow the products of combustion to flow -freely through the checkerwork, and, what is eqi'ially or mo're important, to allow the-blast to flow' freely through the cheek-e'rwork in 'ordento become thoroughly hea tedwhenthe stove is on-blast." l'l he'se stoves vary intype, but nearly all of'thernincludean outer shell,

of the lining and spaced apart therefrom with a; passage formed 'betweenthe said lining and thewall forming thebrick structure. An: arched top is providediwhichis supported --by the-brick a-s'tructure, l and isq-spa'oed from 1540 the top -of-the shell," leavinga ch m through which the cold blast and'th products of *combustion mustpass; The fQOld i blast passes downward: between th'e'gwall o'f the brick :"structure and the i lining for the shell andentersthe 'regenerator chambers at their 1 the arch 'cannot be" anchoredsecurely against the-outslde'shell without restricting the outlusualIyQcyIindricaI*inTshape, mounted. upon .thatthewal-via 12 can be opened} or'closed by -th6 operator duIlI Ig theoperationiof ,the. a stove. 'A cold blasti conduit' l5 :is' provided E which :is connected to a cold blast mainf v16 5 'Ileailing' to the blowing 1 engines or any --s1 1i tahlea source of air supply under pressure, 5 a

bottoms; :Sonietimes the combustion chamlocated tin the center of the stove, but at other times in the'side. With this type of stove it is extremely difiicult toke'ep the arch over the center properly positioned, because side passagetosuch extent that'the fiow of gases therethroughis restricted. In our-improveuyrorm the archcan be anchoredby'the outer shell so that it remains securely in position, and. in" rebuilding the stoves it is only necessar to tear outtheflining andbuild an outside, ue or conduit,"sothat'the steel work,

includingthe shell, chimney, conduits and the l ke, are allutilized in the new structure, and nefiect' a new stove is provided ;at a m mrnum expense. V 1

Th"se andother objects of our invention wlllberb'etter and more fully understo'od'by relflerfince to the accompanying drawings, in w1c'.

j Figure. l'is a'vertical sectional view oiaihot blast stove elnbodyingour invention; and

j; Referring nowlspecifically.toJthe drawings, in which like reference chara'cters refer to l ke parts'throughout; a shell 10 is'provided,

suitable: foundations which have nothing to Admin-our, 'ese t' t" h raylininginsidevof file-51 1611111" CQDtaCt WflZh n 'mven 10H T 6 Shell 10 the shell, 'and a circular brick 'struoture inside has a 'cliimney. l'l secured thereto 'atthe top and opening out to "the atmosphere, through; which' the' products of combustion and waste gasespass, A chimney valve l2'is provided, which is-loperated by a-lever 1 3,;by means, of

va chain 14 which extends to the;gro und,-;so

valve 17 being provided for the control of the flow of the cold blast into the stove. V

A lining 18 is provided, made of brick or the like, which is built up againstthe inside of the shell 10 throughout its entire length,

filled'with brick checkerwork, whichis" built up from the bottom of the regenerative chamber on suitable supports common to stoves of this type. This checkerwork may vary and be made of different sizes of bricks,it being understood that 'passagesare formed 7 between these bricks through which the gases pass in one direction a'ndEthe blast passes in the opposite direction, absorbing the heat fromgthe checkerwork as the blast passes through the stove. A pipel23 is provided at' one side of the shell 10,- communicating.

withthe combustion chamberf21, this pipe 23 providing inlet means for thegas which work 29 may be placed throughout the length is consumed in' the combustionfchamberQL, and also as an .outletfor the hot b-last as the blast passes from the stove when the stove; is on,blast.,;Suitable' valvest (not shown) control the flow of the gas inward a-ndthe hot blast outward into suitable con;- veyingpipes to theblast furnace. At the opposite side of the shell placed thereon, with a sleeve 26 mounted therein to which an end cap 27 issecured to provide means for cleaning the outlet pipe- 24, and also to obtain access to the lower side ofthe checkerwork if: desired. provided, which is connected, to the pipe 24 at'its lower end and passes upward alongside the shelllO and on the outside thereof, andzterminates atth-echimney 11, this'pipe being connectedat apoint opposite the cold blast'pipe 15, so' that when a stove, is placed on blast, the blast passes directlyfacross the chimney 11 and into the pipe 28; Checker of the pipe 28 if desired, or a small portion of itslengthiat the bottom of theshell, and

thus provide in addition the regenerative chamberin the pip'e28, if desired. Theus'e of this checkerwork will depend a great deal upon the operating'conditions'at h ticularl plant. i

- In operation of the device, the gas enters a through the pipe 23 and is burned in the combustion chamber 2 21, the heated gases and products of combustion passing downward through the regenerative chamber 22 out of the pipe 24 and up the pipe 28 to the chimney ail-outlet 'conduit 24 is provided having an-end 25 A pipe 28 is 11., The operator, when a stove is on gas, opens the chimney valve 12 and closes the blast valve 17, so that the products of combustion from which most of the heat units have been absorbed by the checkerwork, pass outward through the chimney valve 12. When it is desired to put the stove on blast, the gas is shut off from the pipe 23, the chimney valve 12 closed, and valve 17 opened, so

that cold blast admitted through the pipe 15 passeswdownward through the pipe 28, through the checkers 29 and upward through the regenerative chamber 22, and thence downward through the combustion chamber :2lxand. out through the pipe-23, where it 1. passes =1nto' the hotblast main by suitablepi'ping and valves in common use in connection wlth 'plants of this type.

It W111 thus be understood that by changing the'p'artitionwalls and the addition of the outside pipe 28.wit h a suitableconnection; therefore, a good many hot blast stoves whichgare now in use can be remodeled and continued'to be used inservice'in the same manneras ifthe stoves were completely torn down replaced with stoves of the usual typejhaving an outlet leading to aseparate chimney directly at the bottom of thecheckerwork.

. Though a preferred" embodiment of the a a present 1nvent1on has been described in detail,

many modifications will occur to those skilled n the art. It is intended to cover all such modificat ons that fall within the scope of the appended claims.

We claim; 7 7 91. A hotblaststove nation, a. stove shell,

a vertically extending .wall in sa d shell, said wall stopping short of the top of the shell. whereby combustion and heating chambers ;are,formed,a lining for said stove having a closed top portion extending over the heating andcombustion chambersand extending over and spaced from the topof the wall between said chambers, ,a ch mney supported by said stove shell, afvalve insaid chimney, a cold airv intake into said chimney below the said valve, a conduit; into said shell at one side thereof whereby air and gas is supplied to said stove, and a second conduit extending 'fromfithe heat exchange slde ofthe stove at the lower portion thereof ad acent the outside of the stove shell and leading into said chimney'ata point, below the valve. g a

,2. A; hot blast stove comprising a metallic shell, a refractory lining therefor having a closed dome-shaped. top, a vertically extending partition wall terminatingshort of the dome-shaped top whereby combustion and heat interchange. chambers. are formed, a

chimney-supported by the, said shell,a valve slll'i'sald chimney, a coldairintake pipe connected-to saidchimney below said valve and above thestove shell, a pipe leading into the comprising, in. combibottom of the combustion chamber forming an intake for gas and air for combustion purposes and an outlet for hot blast; and a pipe outside of the shell connected tosaid chimney below said valve and connected to the stove at the bottom of the heat interchange chamber and forming a conduit for the outlet of the products of combustion and an inlet for the cold blast. V V

Signed at Chicago, Illinois, this 4th day of Sept. 1929. o

WYMAN EATON. I ELLSWORTH J. WESTCOTT.

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