CA1170045A - Shaft-furnace wall cooling arrangement - Google Patents

Abstract

SHAFT-FURNACE WALL COOLING ARRANGEMENT

Abstract An arrangement for cooling the wall of a shaft furnace comprises longitudinal cooling members made in the form of pipes arranged along the furnace wall, and supporting coo-led projections made in the form of pipes with sleeves. The sleeves are fixed on the pipes of the longitudinal cooling members. The pipes of the supporting cooled projections are arranged relative to the pipes of the longitudinal cooling members so that an angle equal to or less than 90° is for-med therebetween.
Such cooling arrangement makes it possible to improve durability of the refractory lining of the furnace shell and, consequently, to prolong the overhaul period of the furnace.

Description

~17~3~45 SH~T~URNAGE WA~ COO~ING ARRANG~M~NT

~ he pre~ent inventio~ relates to an arran~eme~t ~or cooling the w~,ll of a ~ha-~t fur~aceO
~ he arrangement o~ the in~ention i~ readily applicable ~or cooling the wall o~ a bla~t furnaoe with a view to pro-tec-ting the ~urnace shell ~rom detrimental e-~ect o~ the ~urnace a-tmo~phere~
~ here is known a bla~t-~urnace wall cooling arrange-ment which comprl~e~ vertical cooling plate~ and horizontal cooling plate~ 7 the latter bei~g made in the ~orm o~ a ~up-portin~ pro~ection~. The horizontal plate3 are positioned between t~o adjaGent vertical plates (see a book by S~M.
Ando~i~v, O~V. ~illpiev, G.~. Kudinov, entitled "Cooling o~
Blast ~urnaca~", Metallurgia Pub:Lisher~, ~oscow, 1969, p.
232, ~IG.103).
~ arge cut-out~ ~ade ~n the ,ghell to ~erve as port ho-le~ ~hrou~h which horizontal pla-te~ with ¢ooling pipe~ ca~t therein~are introduced into the ~urnace lower the strength o~ the ~urnace ~hell, I~ additiong a~ the cooling pipa~ are ¢a~t in tha plate~, thc metal grai~s tend to grow in size a-nd undergo p~rtial carbonization~
There are also know~ blast-~urnace cooler~ in which 3upportin~ projeotion~ are ca~t integral with vertical pl~-te~; wherein -the pipe ~or coolin~ the supporting projecti-on~ i3 provided with an independent coolan^t ~upply 3y~tem (~ee the ~ame book, p.218, ~IG.97a), or integral wi-th -the . .
, , . . ~ :
"

~ ~ 7~ ~ ~ 5 plate-coolin~ pipe~ (~ee the same book, p.218, ~IG.97b).
Since the supporting projection is made integral ~ith the plate and, ~eing surrounded in the lower part o~ the cast structure by its bulky portion, it is cooled at a very slow ra-ce~ Consequently, with the rate of metal solidifica~ion in the supporting projec-tion being the lo~!rest, the met~l con-cained therein tends to develop cavities and pipings.
Also, the supporting projection has the lowest quality o~
metal. 3y reason o~ being presented to the working space of the furnace, Jhe suppor-ting projection is subjected to the highest degree of rrear c~used by ~he action of the ch~r~e m~terial and that o~ the flow OL gas. ~his bein~ -the main reason for a sho~t service life of the supporting projecti-on in question. ~he des-truction o~ the cast-iron of the suppor~ing projection leads to the destruction o~ -tha-t of the vertisal ~late, which leaves the furnace shell unprote-cted from the action o~ the ~urnace atmosphere. As a re-sult, the furnace shell is overheated and deformed.
Also ~no~n in the art is a blast~furnace wall cooling arrangeme~t Yihich comprises cooled pipe~ disposed along the full vertical extent of the blast-furnace sha~t and welded together by means of stiffenin~ ribs (cf. Japanese Patent Publication ~o. 45-14642, cl. lOA521~. The co~led pipes are conne~cted to the supply and discharge ring mains ~hich are po~itioned in the lovrer and upper part~ of che blast-~ur-~ace shaft. ~he absence of me~bers for supporting the ref-, " ~

~ ~7~ ~5 ractory lini~g invariably leads to an untimely destructionof the entire lining even if a slight dama6e is done there~
t~ in any part o-P the furnace shaft~
~ he device for protecting the shaft-furnace shell des-cribed in Japanese Patent Publication No. 49-6443, cl. 10A521, is the closest in technical essence to the shalt-~urnace cooling arrangement of the present invention. It comprises vertical cooled members or plates which are spaced apart from one another along the vertical extent o~ the ~urnace shaft~ Positioned in the interspaces between the vertical plates are cooled supporting projections made up of seat angles for supporting the relractory lining, which may ex-tend beyond the vertical surface into the furnace, and o members ~or cooling these sea~ anglesO
~he cooling members are made in the ~o~n of hollow steel cases ~hich e~tend into t:he furnace, wqth the seat angles bein~ placed on the cooling members~ The cooli~ mem-bers and the seat angles are fixed to the furnace shell.
The strength of the furnace shell is greatly lowered by the cu~-outæ or port holes through which the cooling members and ~eat angles are introduced into the furnaceO
~ ecause of the large volume and surface area o~ the coolino mem~ers, the entire upper surface of the cooling members and seat angles are overheated v~ith the resultant fo~nation of ste~n and rapid burning-through of the cooling me~bersr ~urt~ermore, it i~ practically impossible ~o pro-~, .

. ' ~ , : - , vide ~or a ~ufficie~t ~elocity o~ -the cool~nt flow in ~u¢h a cooling member (be it water or evaporative cooling), which shortens it~ ~ervice li~e~
~ he above~described ~upporting cooled projection3 have in~ufficient durability, which impair~ the cooling of large ~ectio~ o~ the ~urnace ~hell and~ a~ 2 con~equenoe, cause~
its defo~m~tion and burning-through.
~ at iæ required is ~uch an arran~emen-t for cooling the wa~1 of a ~ha~t ~urnace that will make i-t possible -to lmprove durabil~ty of the refractory ll~ing of the ~urnace sha~t and ~hell, a~d9 con~equently, to increase the overhaul period o~ a ~ha~t fur~ace.
The invention pro~ide~ an arrangement ~or cooling the wall o~ a 3haf-t furnace, which compri~es longitudinal cool-ing member~ located along the fu.r~ace wall, and cooled 9Up~
po~ting pro~ection~; wherein the ~upporting cooled projecti-ons are made in the form o~ pipe~ with ~leeves3 said pipe~
being exte~ded betwee:n the longikudinal cooling members hich are also formed of plpes ~ith ~aid slee~res fi:~:ed the-reo~, the pipes o* the supporting cooled projection3 are arranged relative to the pipes o~ the longitudinal cooling member~ at an~le equal to or less than 90~
Th~ supportin~ cooled projections are preferably made in the ~o~m o~ heat pipes with heat e~changers mounted ex-tern~lly of the fur~ace wall.
With the ~upporting cooled projection~ being made a~

pipe~ 3 the inner cro~ eotional area of the pipe~ i.s xedu-ced while the travelling ~peed of -the coolant i9 increa~ed, hich mean~ improved and reliable cooling o~ -the ~uppor-ting ~houlders a~ well a~ its high dur~bility. High durability of the ~upporting projection e~sure~ lon~ ~ervice life o~
the re~ractory linin~ and pxovide~ reliable protection to the longitudinal cooled member3 and to the furn~ce shell from the de-trimental effect of the .~urnace atmosphere.
Since the pipe~ of the ~upporting projection are not ca3t i~. durin~ it~ ma~ufacture, the phy~ico-mechanical pro-pertie~ o~ the pipe metal remain unlmpaired.
Small surfa~ area o~ ~he pxojections make~ it pos~ible to bring down the removal of heak ~rom the furnace reducing ga~e~, and thereby to lo~er the consumption of ~uel required ~or th~ technological process9 A ~ailure o~ the supporting pxojection does not involve any damage to the longitudinal cooled member~, which en~ures higher operating reliability of the ~urnace shell.
~ 'he cooling arra~ement o~ the 1n~ention i~ simple to manufacture and to a~emble.
~ he in~ention will now be de~cribed, by way o-~ example onlyt with reference to the accompanying drawings, wherein:
~ IG. 1 i~ a ~ro~t view o~ an arrangement ~or cooling the wall of a ~ha~t ~urnace, according to the inventio~i ~ IG. 2 i~ a cro~ ection II-II of ~IG~1;
~ IG. 3 i~ a cro~ ection III III o~ ~IG.1;

. ,J

s ~ IGD 4 i~ a -~ront vi~w o~ an embodiment accordin~ to the inventlo~ for cooling the ~lall of a ~ha~t *urnace;
~ -LGo 5 i.s a cro~ ection V~V of ~IGo4; and ~ IG. 6 î~ a croæs-sectio~ VI VI o~ ~IG~4.
Re~erring now to the drawing~ and to ~IG~1 in partiou-lar, an arrangement for cooling the ~haft~urnace wall com-pri~e~ lon~itudin~l oooli~g member~ made up of pipe~ 1, and ~upporti~g cooled projections made up of pipe~ 2.
~ he pipes 1 are connected to coolant ~upply pipelines 3 (~IG.2) and to coolant disohar~e pipeline~ 4.
~ ixed on the pipe~ 1 are ~leeves 5 through ~hich e~-tend the supporting projection~ made up of the pipe~ 20 Iocated or arra~e~ above the pipe~ 2 i~ a refractory g 6~
~ he coo~er a~ a whole is ~ ed o~ the ~urnace shell 7.
~ he pipe~ 2 (~IG.3) are connacted to coolant ~uppl~
pipellne~ 8 a~d to coolant di~charge pipeline~ 9.
Shown in ~IGS~1~2 and 3 i~ the embodiment on which the longitudinal cooling member~ are mounted vertlcally, the ~upporting cooled proaection i~ mounted horizontally, th~t i~ at an angle o~ 90 to the longitudinal cooled member~
The supporting cooled pro~ection o~ the pipe~ 23 ~hown in ~IGS.1~2 and 3~ has a ~lo~ through coolin~ sy~tem.
Sho~m in ~IGS.4,5 and 6 i~ the embodiment in which the ~upportin~ cooled projeotion made up of the pipes 2 i~ pro-vided ln the ~o~m o~ heat-removin~ pipe~, ~ 7 In -the ~ha~t~ o~ bla~t ~urrlace~ the furnace wall i~
no~ma,lly arranged at an angle o~ 82 to 84 to the horizon-talO ~he lon~itud.inal cooled member~ o~ -the pipe~ 'IG.5) are located or arranged along the furnaca wall. The pip8~ 2 con~tituting the ~upporting cooled member are mounted hori-zontally~ ~hu~, the ~n~le between the longitudinal cooling member~ and the ~upporting cooled projections i~ le~ than 90 ~, Alternativel~ the supporting cooled projection~ may be located ox arranged at an a~gle to the longitudinal coo li~g member~, inclined toward the de~cending char~e materi-alO It i~ advi~able that the re~ractory lining be depo~ited onto the ~urnace wall by a .~lame guniting method.
~ he cooling o~ the 3upporti~g projections, made in the ~orm o~ heat pipe~ af~ected by mean~ o~ a heat axchan ger 10 pla¢ed externally o~ the f`urnace wallO A coolant in-let pipe 11 and a coolant outlet pipe 12 are connected to the heat exohanger 10~
Th~ ~ha~t-~urnace cooling arrangeme~t operate~ in the ~ollowing mannQr.
A coolant, ~uch as water or the ~team-water mixture, i~
admitted through the ~upply pipeline~ 3 (~IGS.2 and 5) i~to the pipe~ 1 ~herein it take~ up heat ~rom the charge materi-al~ and furnace ga~e~, and then i~ di~charged throu~h the pipeline~ 4.
In addition, the coolant i~ fed through -the ~upply ~ 5 pipelines 8 ~IG.3) to the pipes 2, ~herein it takes up heat ~rGm the charge material~ and ~u~nace gases 9 and than i~
discharged through the pipelines 9.
~ he pipes 2 constituting the supporting projection are ex-tended through the sleeve~ 5~ ~ixed on the pipe~ 1 of the longi-tudinal cooled member~, into -the ~urnace interior~ with the re~ractory linlng 6 being laid on the pipe~ 2~
The cooling arrangement a~ a ~hole i9 ~i~edly ~ttached to the ~urnace ~hell 7 (~IG~2) by any conventional means~
Owing to the fact that the ~upporting projection~ ara made in the ~orm of heat-removi~g pipes, a ~luid circulating in the hea-t pipe~ i~ cooled in the heat exchanger 10 (~IGS~
4,5,6). ~he coolin~ i8 e~ectad by means o~ a coolant ~ed through the inlet pipe9 11 a~d di~charged through the outlet pipes 12~

Claims (2)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:-

1. A shaft-furnace wall cooling arrangement compris-ing:
- longitudinal cooling members made in the form of pi-pes arranged along the furnace wall;
- supporting cooled projections made in the form of pipes with sleeves fixed on said pipes of the longitudinal cooling members, - said pipes of the said supporting cooled projections extending between said pipes of the said longitudinal cool-ing members and arranged relative to the latter so that an angle equal to or less than 90° is formed therebetween.

2. A cooling arrangement as claimed in claim 1, where-in the supporting cooled projections are made in the form of heat-removing pipes with heat exchangers arranged exter-nally of the furnace wall.