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Патент USA US2408729

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Oc't. s, 1945;
A. BOWLAND
HoT-??LAsT STOVE
Filed Aug. 3, 1942
2 Sheet's-'Sheet 1
INVENTOR:
'
?/VDEEW
ÖOWLÂ/VD,
BY:
H?S ATTORNE .
Oct. 8, 1946. _
A. BOWLAND
2,408,728
HOT-BLAST STOVE
'Filed Aug. 3, 1942
2 Sheets-Sh?et 2
F?E- 2
.
INVENTOR I
;Jy/Eylem Baz/mmm,
&408328
Patented Oct. 8, 1946
2,408328
4'-HOT-'BLAST
7 5 ;AndrewBowla??dg-Mount Lebano??vgPagassignorto
._ „W?ll?am M. Baileyrcompany,yarco?äporation of
?lApplicationAugust 3, 1942,i-SeriaLNo;‹4532353 `
i 3 Claíms. (01163419)
'This inventionv-relates ;to hot-_blast-?stoves, 'of i
idomes- 2~and?=s~ -by this' shell 'I . "I'hermal 'eXpan
ision šspace?is-provid?d;between the outside?of the
;lining 'I ?Land the inside' ofíthe shell-1 ,?andithere
«ist room;*insidetheidome *2' for 'all the »brickwork
`thetic rubber?industry with a stove?of this 'type
to thërmally jexpand without moving›` »this deme.
?capable of Operating_ at the high; temperatures 5 Bothíthesteel domes =2:,and<6 support'brick :linings
.required by this industry,~which _are considerably
134 andi 1 .4;: respectively, “these ?linings: Testing› on
higher than ;the `safe ,Operating limits of prior
-inwardly? extending ??anges? of the' cylindrical dome
;the type used toheatthe blast _of ?an iron?blast
-furnace, the object /beingto ,provide the syn
.art blast-furnace ?hot-blast stoves. :Ingaddition
«sid?s r 3 `and 5,; respec'tively, -' and thermal -expan
to Kits special ?eld, a stove embodying the ;inven
:sion' spaces :being provided_ between the sout'sides
10
.tioncan be used whereveritstype is required.
of the :brick linings" .and :the '?insides 'of :the -'- two
~' ?A speci?c example?of ~a hot-blast stove con
steel sdomes. The ~~interconnecting ;steel 'du'cts 4
-structed-according› to ?the ;principles of this' in
rare'vprovided 'with t?at-šbottonis, :straight *vertical
?ventiomis 'illustrated by the accompanyíng ,draw
sides :and rarched Proofs; this* permittingthem ::to
ings, the various ?gures being as follows: ,
15 'be lined 'with ?standard "size'd ,bricks "formin'g
»Figure-lgisa vertical section'ofthe stove;
Figure?z isa horizontal cross-section ;from the
.line II-IIin Big-,ure 1pn~an~en1arged scale; and
-Figure :3 is ;ai vertical :cross-.section ' from the
line› III-'III ' inø lí'igure 1 on › a,›.sti1l:further=„en
-larged scale;
_
.
~More speci?cally, :these ,drawings show. a 'verti
cal ?substantiallyvcylindrical _steelshell I support
ing a› steel dome--Z oníits top, _this „dome ,12 %having v
a vcylindrical.?stee1°;side_:3 from rwhichrtwo verti
cally elongatedxlaterally'spaced steel?ducts 4?'ex
tend substantiallyv horizontally :With: their `en'ds
converging andconnecting fwith .the cylindrical
;side-5 -of ;aásmaller` secondsteel .dome 6 sothat
'this second deme íis i supported :by the :?rst "dome
:2 :which is, in turn, 'supportedby?thestéel shell I,
vthe?atter, of_?course,vrestingson-the?ground. :The
'ducts ?4 'function vertically.,as?cantilevers _carrying
the weight of the dome 6, and functionä'laterally
aswstruts.providingíilateral rigidity. i The ducts 4
provide greater rigidity as cantilevers by reason
of being made .with Vertically elongated cross
sections.
This second dome 6 connects through ~
a thermal expansion connection "I with a second
Vertical substantially cylindrical steel shell 8 hav
'arched-?-topped: ducts r 1:5 which i constitute :brick
linings ifor :the rstee'l ductsr'4, these, brick ilinin'gs
.or durcts? l??ib'eing' "bu?tëintoiihe liníngs“ l 3 and3`1I4
so they are also supported by „the domeiiside
“?'anges, *and :having expansion "spaces between
ítheir'outsides andi-,he insides of the 'steeiducts'at
their ähottoms, :sides and tops.
-
"The-;second 'steel?domere andíits brick lining !4
*are much smaller! 'than 'thetzste'etdome'?z and -its
jbrick'ilinir?g '513, "the second `steel :shell ~8 being
?likewiseaconsiderably smaller than :the steel shell
Il 'and ;containinga brick. lining 16 the weight of
which-is? carrie'd'?byrthe support: 9 and which has
-its :outside 'spaced ,from'the iinside “of the steel
r'shellssa ?toprovide atherm'arexpansion space.
.The brick ilining 116 -ofíthis .second cylinderše 'is
provided with a burner-.connection '-`|`1 andmcor?
stitutes the stove's combustion chamber.“^'Thus,
;the íst'ovei is ?sof?'thesexternai combustionëchamber
štype,atheäcdmbustion-ichamber lbei'ng entirely?out'
side of .the checkerwork ?n and the lining i l, and
V laterally spaced therefrom as an independent
unit.
i
v
v
In operation, a burner is connected at the con
nection !1, and combustion ovccurs inside the lin
ing its own supporting means› in the form of a 40 ing !6 in the manner necessary to produce the
platform 9 on which its bottom rests.
high temperatures required by the'synthetic rub
The above Construction involves the advantage
ber industry. This introduces no complications
that thermal expansion vertically is balanced
throughout the structure, the two domes 2 and 6
mOV?ng Vertically as a unit when the shell I moves
vertically, the shell 8 being unaffected by this
because the vertical combustion chamber brick'
lining !E can thermally expand without affecting
any of the other stove parts, this likewise being
true of the combustion chamber steel shell 8.
This isimportant because these 'are the hottest
parts of the stove. The top of the Vertical brick
50 lining !6 telescopes inside the bottom of the brick
lining !4 of the deme side 5, to an extent su?l
movement since it is working through the expan
sion connection 1, this also “meaning that the
shell 8 is free to move vertically independently
of the shell l and the two domes.
Inside the shell I is the stove's vertical brick
cient for safety purposes, there being no `connec- i
checkerwork ?o with its laterally enclosing ver
tion
between the two, however.
tical brick lining I I, all this brickwork being car
The combustion products exhaust into the brick
ried by the stove bottom ?z independently of the
?ining I 4 of the steel dome E and travel from there
shell l and being relieved of the weight of the 55
3
2,4os,728
4
through the brick linings !5 of the ducts 4 so as to
having a sheet metal housing spaced from the
introduce parallel horizontal ?ows of combustion
outer wall thereof, a, combustion chamber spaced
products into the brick lining !3 of the steel dome
from said checker tile structure having an in
2› at positions spaced circumferentially of the side
sulating Wall and a sheet metal lining spaced from
of this lining, the e?ect being a distributed hori CI
the
outer wall thereof, domes mounted on the re
zontal introduction of the combustion products
spective checkerwork and combustion chamber
v into the checkerwork dome so as to avoid local
damage, particularly, to the top of the checker
work. To enhance this protection, the top of the
structures having communicating ducts laterally
spaced to deliver the products of combustion
from the combustion chamber over substantially
checkerwork is positioned well below the level of 10 the entire area above the Checker tile, said ducts
the ducts, this, in conjunction with the vertical
being of a greater horizontal cross-sectional area
cylindrical sides of the checkerwork dome,Apro-› '
viding a large expansion space for the combus- „
tion products. The combustion products then
travel evenly down through the checkerwork m
`than the dome above the combustion chamber,
said domes and ducts having a sheet metal outer
housing connected to the housing of the com
bustionchamber by a thermal expansion joint
whereby the duct connected domes are vertically
and out through the bottom of the stove.
During the necessary cyclic operation, the teme
movable as a. unit in response to thermal expan
sion of the checkerwork wall.
tremes, but this does not upset the balanced con
2. In a hot blast stove comprising a checker
struction of the stove. Thus, the checkerwork ID 20 work unit and a, combustion unit communicating
perature of the checkerwork varies between ex
and the brick lin?'ng H may thermally expand
without affecting the steel shell I, and the latter
can likewise thermally expand, it carrying both
the domes 2 and 5 which can move independently
of the steel combustion chamber steel shell 8, by l
reason of the thermal expansion connection 1.
to deliver the products of combustion to the top
of „the checkerwork unit, oía plurality of domes
mounted on top of said units joined by laterally
spaced ducts of greater horizontal cross-sectional
area than the dome above the combustion unit,
'said ducts being spaced to distribute the prod
This independence is important because of the
ucts of combustion substantially uniformly over
temperature differentials, such as those existing
the entire area of the checkerwork in the cham
between the combustion chamber and checker
ber
formed by the checkerwork unit dome, the
work, for instance. As in the case of the lining 30 combustion
unit dome having thermal expansion
|6 in the combustion chamber, the lining l l eX
connection with the wall of the combustion unit
tends upwardly into safe telescoping relationship
and said checkerwork and combustion unit domes
inside the depending lining of the checkerwork
and communicating ducts having sheet metal
dome, the two parts being entirely free for rela
housings_
tive movement.
In no instance is any of the
3. In a, hot blast stove a checkerwork unit and
brickwork required to support anything other
than its own weight, and there is no instance
where the thermal expansion of the brickwork is
a combustion unit having domes forming cham
bers at the top thereof communicating through
a plurality of laterally spaced ducts, the longi
restrained in any manner.
It is because of these constructional details 40 tudinal cross-sectional area of which is greater
than the dome above the combustion unit and
which permit the stove to operate as a balanced
being spaced to distribute the products of com
Construction with all of its parts free to thermally
expand to the varying extents resulting from
their varying temperatures, that the stove can
operate safely at the hightemperatures required
by the synthetic rubber industry. Before closing,
attention is called to Patent No. 2,257,453 showing
a stove shell and thermal insulation particularly
adapted for incorporation in the present inven
tion, this not being illustrated by the drawings
in the present instance, to avoid confusion with
the fundamentals here involved.
I claim:
1. In a hot blast stove comprising an insulating
bustion substantially uniformly over the entire
area at the top of the checkerwork, said checker
work, combustion unit and domes having refrac
tory linings and sheet metal housings interacting
to be independently movable responsive to ther
ma1 expansion, the dome and duct structures con
stituting a monolithic wall with the duct walls
50 functioning vertically as cantilevers carrying the
weight of the combustion unit dome to adapt the
dome units for thermal movement independently
of the checkerwork and combustion unit walls and
wall having checker tile mounted therein and 55
housings.
i
`
ANDREW BOWLAND.
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