CA2489081A1 - Coke oven doors for promoting temperature increase in the vicinity thereof - Google Patents
Coke oven doors for promoting temperature increase in the vicinity thereof Download PDFInfo
- Publication number
- CA2489081A1 CA2489081A1 CA002489081A CA2489081A CA2489081A1 CA 2489081 A1 CA2489081 A1 CA 2489081A1 CA 002489081 A CA002489081 A CA 002489081A CA 2489081 A CA2489081 A CA 2489081A CA 2489081 A1 CA2489081 A1 CA 2489081A1
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- CA
- Canada
- Prior art keywords
- coke oven
- combustion gas
- nozzle
- oven door
- vicinity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B25/00—Doors or closures for coke ovens
- C10B25/02—Doors; Door frames
- C10B25/06—Doors; Door frames for ovens with horizontal chambers
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B43/00—Preventing or removing incrustations
- C10B43/14—Preventing incrustations
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
Abstract
A coke carbonization furnace cover capable of promoting an increase in temperature of coal particles (2) charged in a coke carbonization furnace (1 ) near the coke furnace cover to suppress the generation of defective coke and occurrence and adhesion of tar, wherein lateral body support frames (16) are installed at multiple positions in the vertical direction of the furnace in an insulation box (11) provided on the coke carbonization furnace side of a furnace cover structural body (3) for opening and closing the access opening (4) of the coke carbonization furnace (1) for charging the coal particles (2 ) therein, and furnace generation gas migration and separating chambers (15) o f bottom-less structure are provided between the lateral body support frames (16) in vertical direction in the state of coal particle entry shielding str ip members (17) vertically and horizontally arranged parallel with each other a nd detachably suspended with small ventilating clearances (18) provided in the lateral direction thereof.
Description
SPECIFICATION
Coke Oven Doors for Promoting Temperature Increase in the Vicinity Thereof Field of the Invention This invention relates to doors of coke ovens for manufacturing coke by coking coal particles charged into coke oven chambers (furnaces) by the high-temperature heat supplied from combustion chambers (furnaces) adjacent thereto, and particularly to coke oven doors for reducing the generation of poor-quality coke by promoting the temperature increase of the coal particles charged near the coke oven door plugs.
Background of the Invention A coke oven battery for producing coke by coking coal particles essentially comprises regenerative chambers 51 having a brick checkerwork therein disposed in the lower part thereof and intervening combustion (heating) flues 52 and coking chambers 53 disposed over said regenerative chambers, as shown in a partially exploded perspective cross-sectional view in Fig. 14. Reference numeral 54 designates a coal charging hole provided in the top of each coking chamber.
Reference numeral 55 denotes coke oven doors that close off and open up the entry- and exit-side openings of each coking chamber 53. The coke oven battery heats the coal particles charged into the coking chambers 53 by the combustion gas and air preheated in the regenerative chambers 51 and then burnt in the combustion chambers 52 adjacent to the coking chambers. The waste gas generated in the combustion chambers 52 flows to offtake stacks after passing through exhaust ducts (not shown) provided on the coking chambers 53 and then through flues 56 while heating the brick checkerwork in the regenerative chambers. The coke oven doors closing off and opening up the openings at the pusher and coke sides of the coking chambers are required to have a high enough heat resistance to withstand the high temperature ( 900 °C or above ) at which the coal particles charged into the coking chambers are dry distilled and a high enough sealing ability to prevent the scattering of dusts from the coking coal particles , the leaking of methane , carbon dioxide , hydrogen and carbon monoxide gases generated therein and the seeping of tar.
Coke oven doors comprise approximately 400 mm thick heavy refractory blocks or bricks fitted in the pushing- and delivery-side openings of coking chambers and sealing members shaped like the cross-section of a knife edge pressed onto the space between said refractory blocks or bricks and the wall of the coking chamber, as disclosed in many Japanese patent gazettessuch as Japanese Examined PatentPublication(Koukoku) No. 60-25072 and Japanese Unexamined Utility Model Publication (Kokai) NO. 5-56940. Recently, coke oven doors comprising refractory blocks or bricks adapted to plunge into the pushing-and delivery-side openings of coking chambers through seal plates were developed, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2001-288472, and are finding increasing use because of their effect to greatly decrease gas leakage during coking.
Made of heavy refractory blocks or bricks as described above, coke oven doors are capable of withstanding high temperatures and permitting long use. However, the refractory blocks or bricks of the coke oven doors that open up and close off the pushing- and delivery-side openings of coking chambers in every pushing is and release large quantities of heat when opened and absorb large quantities of heat when closed.
Therefore, the coal particles charged near the coke oven door plugs are not heated high enough, as a result of which large quantities of undistilled poor-quality coke are generated.
Thus it has been said that as much as 1.5 million tons of poor-quality coke are generated in Japan, which means there are a lot of waste of coal particles for the manufacture of coke and loss of heat energy. There have also been many other problems, such as collision and peeling of refractory blocks or bricks , mixing of peeled refractory blocks or brick fragments with coke , thermal damage of the coke oven door structure that might occur if peeled portions are left unrepaired, and removing of peeled blocks or bricks from delivered coke.
Coke Oven Doors for Promoting Temperature Increase in the Vicinity Thereof Field of the Invention This invention relates to doors of coke ovens for manufacturing coke by coking coal particles charged into coke oven chambers (furnaces) by the high-temperature heat supplied from combustion chambers (furnaces) adjacent thereto, and particularly to coke oven doors for reducing the generation of poor-quality coke by promoting the temperature increase of the coal particles charged near the coke oven door plugs.
Background of the Invention A coke oven battery for producing coke by coking coal particles essentially comprises regenerative chambers 51 having a brick checkerwork therein disposed in the lower part thereof and intervening combustion (heating) flues 52 and coking chambers 53 disposed over said regenerative chambers, as shown in a partially exploded perspective cross-sectional view in Fig. 14. Reference numeral 54 designates a coal charging hole provided in the top of each coking chamber.
Reference numeral 55 denotes coke oven doors that close off and open up the entry- and exit-side openings of each coking chamber 53. The coke oven battery heats the coal particles charged into the coking chambers 53 by the combustion gas and air preheated in the regenerative chambers 51 and then burnt in the combustion chambers 52 adjacent to the coking chambers. The waste gas generated in the combustion chambers 52 flows to offtake stacks after passing through exhaust ducts (not shown) provided on the coking chambers 53 and then through flues 56 while heating the brick checkerwork in the regenerative chambers. The coke oven doors closing off and opening up the openings at the pusher and coke sides of the coking chambers are required to have a high enough heat resistance to withstand the high temperature ( 900 °C or above ) at which the coal particles charged into the coking chambers are dry distilled and a high enough sealing ability to prevent the scattering of dusts from the coking coal particles , the leaking of methane , carbon dioxide , hydrogen and carbon monoxide gases generated therein and the seeping of tar.
Coke oven doors comprise approximately 400 mm thick heavy refractory blocks or bricks fitted in the pushing- and delivery-side openings of coking chambers and sealing members shaped like the cross-section of a knife edge pressed onto the space between said refractory blocks or bricks and the wall of the coking chamber, as disclosed in many Japanese patent gazettessuch as Japanese Examined PatentPublication(Koukoku) No. 60-25072 and Japanese Unexamined Utility Model Publication (Kokai) NO. 5-56940. Recently, coke oven doors comprising refractory blocks or bricks adapted to plunge into the pushing-and delivery-side openings of coking chambers through seal plates were developed, as disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2001-288472, and are finding increasing use because of their effect to greatly decrease gas leakage during coking.
Made of heavy refractory blocks or bricks as described above, coke oven doors are capable of withstanding high temperatures and permitting long use. However, the refractory blocks or bricks of the coke oven doors that open up and close off the pushing- and delivery-side openings of coking chambers in every pushing is and release large quantities of heat when opened and absorb large quantities of heat when closed.
Therefore, the coal particles charged near the coke oven door plugs are not heated high enough, as a result of which large quantities of undistilled poor-quality coke are generated.
Thus it has been said that as much as 1.5 million tons of poor-quality coke are generated in Japan, which means there are a lot of waste of coal particles for the manufacture of coke and loss of heat energy. There have also been many other problems, such as collision and peeling of refractory blocks or bricks , mixing of peeled refractory blocks or brick fragments with coke , thermal damage of the coke oven door structure that might occur if peeled portions are left unrepaired, and removing of peeled blocks or bricks from delivered coke.
Many pateni gazettes~dclose cope oven doors newly developed with tile improvement' of coke oven heaat efficiency in ~. . a::. .;' mind. For example, Japanese 'T,sacamri.ned Patent Publication ' (Koukoku) No. 03:-4074 (Japanese application filed in 1981) discloses a 'method for cohin,g.~.the .charge in the cope oven ~bp sending the hat gas gene~cated.by.~sai.d charge to the gas pas$age through the vert~ca3. flue prov~~ed in at least one of the doors r, :.: ~ :.., in aontaot with said charge arid-:separated from the int~rior of~
the coke oven by: the thermal,ig':,conductive metal wall const~.-, v tuting said Boar and moving. ~~j~i~t ~of said hot gas to an upper .. ....;:,::. ..:
end region in co Itact ~,rith sa~d~'p~rtition wall therethrough by . , i , ......., :.. .
the ascending of said gas ~ ~adv the heat conductivity of the . ,. ~. ::. _v-':~~:; '~.
partit3.on wall' ~ A "coke oveiu:'>aoox varr~.~.ag on the inner side thereof a shield lallowirrg pass~ge~af gases generated 3.a the oven .~:: ;.~~~; y:.'. ,... , that aompriaes 'shielding metub~Ts'.made up of spacers arid ~col~..ng plates' disc7.osed in Japan~~e'~Wamined pa.tesnt Publication (Koukoku) No. 61 ~ 49353 (Japanesevapplication filed in 1983,) ~was~
developed based li on the above=c'~e'scribed method . Many other . i; . .. ., . . ., ~;., ._...
heat-up cope oven doors hay~~vbeea developed, such as a 'co7re' oven door comprising a sh~.gld"rattached to the inner side of the oven wall via fi~ting$ to foratravspace for gas pa.ssagg and made up of multiple . ~h~.eld. msmli~r~ axaving vertically partitioned U-shaped cross ~ actions' ldiso~iis~d in Japanese Unexamined' ~~~.
Patent Pub~.iication (Ko~cai,) ~No:~'62-72782 (Japanese application . . I. -.-: .:~,,_:.',.. : .
filed in 1986).la 'coke oveu'door comprising hsat~-xesiating ,.:,:;:'_' . .. .
. : . r, :4.. .
. ,'.::. ~_.~;-; . , v packiags attached to both s~:d~s'ot the cake oven walls ' ..
comprising metal shields provided. on the inside of the oven door j- '~~,~: ~ .
proper via spacers to fozm y;vs~i'aee for gas passage" disclosed (; :. ~.v...
in Japanese Bxaniined Utilit-y:~o8e1 Publication ( Kc~ulsoku ) No ,: .,~ _~:.~ .s.;,;; ,.
06-43146 ( Japanese appliaatio~: filed in .1~$8 ) , and ~. 'coke oven ~; ,...... ; ., Boar with ceram3:c coking plate~r' disclosed in Japanese Unexamined Util3ay Model Pub'lfcatiox~ (Kokai) No. 02~~994fi . ;. .. ~ Japanese. application files 4~~~. ~~9881 - Japanese ~xamined~~ , , Pateat. Publicat~~on (Koukoku:).ll~To_ ~~05-38795 (Japanese applica- .
tion filed in,19,a~6 ) d3.sclosas;~;.:'G~ke even door heated by raising .;.. , ; _.,;.;.;,: ...
the temperaturQ of a gas spe.G~;.~~by~.ded between a heat insulstor~
:a:
attaahsd to 'the even door aad' a.'l~~ating plate on the inner 'side . , ~. , :,~ ..:,.;: ,.. .
of the oven b burnin Y g, part . of,comT~uBtible ,gas~s generated ~by .y.~;-.F.v~.,~~_:.. . .. ' coking with the ' air and oxgges~, blown in from outsid~x" . ' , Also, several poke ~~~reri-.doors having a gas flue to pays' v . j' _;v:,:~;.;:;,~;:,s,..... . ..,..
the gases generaited i n tha~ o~ea~,'or one 3.~naorporating a heat3.ag v.
burner. in plat ~ of the c~d~vei~itional x~afra,ctory bricks, vn the ,' , ' cokin chamber ~ ide '~:~.
g i, thereof ~x~.vve~ been introduced as those ,..:::::;~, ;,;
: promoting the t I perature iiiQr-ease of coal particles charged . . . . , ...:r:.,.'I . .. .
near the coke over doors. 'Fax~,.~example,~ Japaaese Kxami.ned Utility l~Odel i~ublication (~Co...~ca'7cu) No. 02.-2.6913 and Japanese:
Unexamined Utility Model '~catioa (~Cokai) No_ 06--43146 i. : ..;:: v'" '~ :~ ' .
_..;, disclose a coke :oven doar..i~omprising a metal gas flue shield ..':
. attached to the :oven prop~~'via: ~a hea.~-iasulating box made of~
. . . . j; : ; ..:..~;.;; :°' °,, a heat-lT.suTati.ng ma.te~ial.~:~~~~ed with steal sheet" .
I; ;:=.: ': ' :~:.
Japanese FY~e~ Patent Fubhication (~oul~oku) No. 63-112686 discloses a 'combustion type-~ca7ce oven door that burns, in. the .' . ,.
gas space enolosed by metalv,~hield,, part of combustible gases.
generated duriagl coking cyc:3:e~:~~iiith the ai.r or oxygen blowri.v.n :_ .~;.t'.: .:.:
from outside. These newly,~de~eloped coke oven doors are expected to deor~ase the geaeration of poor-guality coke and ;.a= -; : ..
tar as they heat the coal part~ale~s~ near the coke oven door plugs .
.. .:_.
by the high.-temperature heat'~b~:'the gases generated in the oven ;, : :., :.,,;,, :, by providing shi~ids or space~~o~es li7ce gas flues to allow tk~e ;: ; : ; ,;~;~.,,_;,,: . , ., . ., passage of such gases to the .c~il~es oven doors. However, none of the~t have., yet been put~,~i.ao.tcs.; ~praatical use.
Though note certaia, . ttte.;finventar presumes that suah tsolce ~' .
.:.~.:=r...-.,,.
~'.:r:; .:::'' oven doors have 3involved th~svfo7~owing problems: Conventional space boxes aomp~ ise fabriaateclv: thin metal shield boxes having small as vents _~ Becausevthe~:lover of ases~ ~enerated in the :~
g g g .
Qven is thus limited, the temperature . is the space box do~s .not . ~ ~ .
rise high enough~;to raise the'=temperature .of the coal particles - , ~~
near thm coke oven door to tliea"ezpeote~d level. The sludgy tat' generated duriu ~, coking cyicl~:Mows into the narrow vents snd . ~.
..,.;.; ;:,:;._;..:: , clogs them by solidifying. ~Rgvcpening of the tar vents slogged ' w w j.:.'.-::r . .
by the tar must j;be done quiry,:.in an environment that st37.1 .'.:
retains high temperature. of :er: .pushing. Besides the space boxes have suahl; struatura.Z ~'p~oble~s a.s~; deforming under the ~ . y , influence of th~rmal stres$e~s'~due~ tc~ frequent heating anc3, :.: v.
cooling repeate~ and cracYiugvs~arting from metal sheet ~o~ nts and progagatiag to other area~':.~~~..
I
I. -Object of the Invention i r.' . . ~. .:
The iaventor invented aeret~:~co7te oven doom that gcrntit long stable operatxonl and give ~enoug~~time to repa~c cols~ng chamber damages during push~g cycle"'time by solving 'the .
I
above-mentioned !aonvention~ y~i~abTe:ms such as generation of I. ... , poor-quality col~ce near the aclce~v~sren door$ linedwiiith refractory.
blocks or bricks!: and d:iffiaul~y;~rt use of coke oven doors with hollow type metal plugs.
Suu~ary of the Invention '' ~ ~ . ~ .
Through m I' y e~perime~iit.'aad studies intended for the".
~ :, _:~~;;. y ~..; ..
i .;; .: ~ . _ . ... ..
achievement of ~asd ob,~eat~;... tIie:~~inventor disao~T~red that .~
~_ . :. ...'-y, :.. . .. .
provi$ioa of an vinwelded oh~bsi'to ci.raulate ~a~td isolate ~gases~
I' ~.::~,~,~:,:~ . , generated iuv the oven, whia'h~':cbmprisea a shielding wall notiade up of vertically: and lateralLy:3i~stapcrsed metal shield bars ta.
;.;~:,:~:;:,~;:~
prevent the inflow of coal paiiales, with minute slits provided .,..,.,:-.~...
on both s~.des thereof, on :~i:~~:yauer. or coking chamber side 'of the coke oven door ~l.lows_ .t~.e.vvlarge guantities of gases generated in the' cope oven.. a~"'s~.'y.z~taln3.ng high heat to d~cectly~
heat the coal p~rtiales cha~ge'd: near the coke oven door while flowing through the coal pa.aicles ~ to said migration and isolation chamber . The gaae~. generated ~.ya the coke ovea and '' r -flourino into s~i~r7 miaratio7rY ~,'~~tpiat~.on ahambAr thxough Wid v'7.. .
i: ~ _ ~;~:~r.~:~
minute slits an both sides~yo~':'the vertically and laterally' juxtaposed shield bars wittivut' b'eix~g inhibited raises the temperature is ~ai.d migratiou~. and 3.solation chamber and directly k~eat tla:~e coa,1 partiGl$s~ near the coke oven door via I.
:~....~_!.'r':.
said shielding w~7.1 of metal, ~~ti3el~~ bars . That is , the inver~tor discovered that i~he heatiag colcs;"voven Boar sandwiching the opal' particles near the coke ove~',~doo~ from betm~en. the coke o~cren I, ,..:-. :.,.; .-. .
I; °i..s-''.,:_.;i..... ~ .
and oven door sides promot~s:':;#~.eating and caking of tha csoal' particles near ~e cake ovezi.?~'doar and g~ceatly prevex~ts the .- ..::..<., generat~.on and adhesion of~ vt'~r:: ~. .
A cope, oven door for':promio-tl.ng teucperature increase,~ia ,: . ,. : ;; :. ; ,:. :. .. .
the viainit~r , of '"door plugs..acccirdz.ng to the present invention p ~, :,,:: ;::,:;-:.;-:.:--v:. .
based on the ab ~~ vre fj.nding:,, '~i~prises a hee.,t-insulating boy .~
:; .;.'.,.. .
provided oa the I inner Aide ~'o~';v.oven door structure adapted ~..; .~~..: e: .
. . ..a,', .'_::.,-; ..
to open and claw a door jaiub:':~:n:vfih~e colts oven Charged with coal "-~~.w<';r ' particles via a, seal platc~~~i~cesssed agaiast~ said door jamb, .
u.,..l:...
_. '~..;. : ..:?:: ~' ' s.w,. : ~,..
horizontal support frames. ~p~pvid.~d to partition the height ~of i said heat-insul~.ting, bay :3ntv~"multiply sections, and a .
,.: ., ; . .. ._;.
:.:'-,: °.: ~; ..
bottom-less gas migratiouv'~a~8~~~.solatiou chamber formed by , I. ._ .. '~i:~
;.._i 5, y. ,, ..
arranging shier bars to, pxeveaiit , the ~ entry of , coal pait3ale~s , .
laterally and vertica7.ly ~oith;sm~il ventilating spaoes' left on I; :-.:. .~;:~.~ :,-:. ~ . . .
both sides thereof, to fill':tlze;'spaaes betv~een said horizontal .;.. :.
'::~~;:;;.:. ' support frames . ~' with the' up~~, e:i.d thereof pivotally fastened to said horisontal suppar~~:f~a~tt~s'_ , Also, adjoining ends of at " :~:y:._.,~~.V~ ...
least the sluel~d bars to ~pre~~nt, the entrg of coal particles arranged on the coke oven side of the bottom-less gas migration and isolation chamber are joined, if required, by stepped joints, with small ventilating spaces left therebetween. A coke oven door to promote temperature rise in the vicinity thereof also may also have the mating ends of the vertically arranged shield bars, i.e. the lower end of said upper bar and the upper end of said lower bar movably joined together by forming notched cross-sections, with a notched mating groove directed toward said gas migration and isolation chamber provided on one of the mating ends and a loosely fitting projection on the other.
A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, upper shield bars fitted in spaces in said heat-insulating box partitioned by horizontal support frames having a slot extending in the direction of oven height and provided in the mating surface of the lower end thereof, lower shield bars having a downward-extending projection adapted to pass through and engaging with said slot and a projecting stopper adapted to come in contact with the lower end of said horizontal support frame provided in the lower end thereof.
A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, horizontal support frames having a rugged engaging portion at the upper edge and provided to partition the height of said heat-insulating box into multiple sections, and a bottom-less gas migration and isolation chamber formed by putting together, both vertically and laterally, shield bars having two separated hooks adapted to engage with the dents on both sides of a projection on said horizontal support frame by stepped joints, with small ventilating spaces provided on both sides thereof and vertical sliding spaces on the projecting side of both stepped joints, and a projecting stopper to prevent the breakoff of the shield bar by coming into contact with said horizontal support frame provided in the lower part of the shield bar.
A coke oven door to promote temperature rise in the vicinity thereof also has a cast-iron box containing a heat-insulating material between the oven door structure and the bottom-less gas migration and isolation chamber.
A coke oven door to promote temperature rise in the vicinity thereof has one or more vertical nozzle pipes separately provided in the bottom-less gas migration and isolation chamber, each of said vertical nozzle pipes comprising a gas nozzle in the upper part , a coal dust chute in the lower part , a combustion gas supply pipe communicating with a combustion gas supply ~0 source provided therebetween,.
A coke oven door to promote temperature rise in the vicinity thereof has one or more combustion gas injection nozzles separately provided in the bottom-less gas migration and isolation chamber, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation chamber at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, a cylinder fastened to the uppermost point of said combustion gas nozzle pipe, said downward opening shutter movably connected via a movable connecting rod to a rod connected to the coke oven side of a piston reciprocating in said cylinder, and a gas flow pipe connecting the combustion gas pipe nozzle between said nozzle and downward opening shutter and the oven door side of said cylinder.
Another coke oven door to promote temperature rise in the vicinity thereof has one or more combustion gas nozzle pipes separately provided in the bottom-less gas migration and isolation chamber, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation chamber at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, an ovally shaped annular member whose upper end tilts toward a combustion gas supply source and lower end toward the nozzle, and a downward opening shutter closing an opening in said annular member from the side of the nozzle.
Yet another coke oven door to promote temperature rise in the vicinity thereof has a tar reservoir communicating with the combustion gas passage at one end and having a closing lid at the other is provided below one or more combustion gas supply pipe or combustion gas nozzle pipe separated provided in the bottom-less gas migration and isolation chamber.
Brief Description of the Drawings Fig. 1 is a cross-sectional view of a coke oven door according to this invention taken in the direction of oven height.
Fig. 2 is a partially omitted, enlarged perspective view taken along the line A-A of Fig. 1.
Fig. 3 is a cross-sectional perspective view of another embodiment of this invention in which shield bars to prevent the entry of coal particles are placed one next to another.
Fig. 4 is a perspective view of a joint mechanism for joining together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 5 is a perspective view of a fastening mechanism for fastening together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 6 is a perspective view of a fastening mechanism for fastening together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 7 is a cross-sectional view of the fastening mechanism shown in Fig. 6 taken in the direction of oven height.
Fig. 8 is a perspective view of a horizontal support frame used in the fastening mechanism of Fig. 6.
Fig. 9 is a cross-sectional view of another embodiment of this invention with a bottom-less chamber for allowing migration and isolation of gases generated in the oven having a vertical nozzle pipe provided in the direction of oven height .
Fig. 10 is an enlarged cross-sectional view of the vertical nozzle pipe shown in Fig. 9.
Fig. 11 is an enlarged cross-sectional view of a burning gas nozzle provided in the bottom-less chamber for allowing migration and isolation of gases generated in the oven.
Fig. 12 is an enlarged cross-sectional view of a burning gas nozzle provided in the bottom-less chamber for allowing migration and isolation of gases generated in the oven.
Fig. 13 is a scaled-down view of another burning gas nozzle pipe in which a tar container is provided in the nozzle-side burning gas flue of the burning gas nozzle pipe shown in Fig.
12.
Fig. 14 is a partially exploded perspective view of the basic structure of a conventional coke oven.
Preferred Embodiments of the Invention Details of this invention will be described by reference to the drawings.
Fig. 1 is a cross-sectional view showing an embodiment of this invention in the direction of oven height. Fig. 2 is a partially omitted, enlarged perspective view taken along the line A-A of Fig. 1. In Fig. 1, reference numeral 1 designates a coke oven , 2 coal particles charged in the coke oven 1, 3 an oven door structure that opens and closes an opening 4 in the coke oven 1. The oven door structure 3 comprises a sturdy cast iron frame 5 reinforced with flanges and is adapted to open and close the opening 4 in the coke oven 1 via a seal plate 7 that presses an door jamb 6 of the coke oven 1. Reference numeral 8 denotes a latch that comprises compression springs, screw bolts and other fastening members and presses and fastens the oven door structure 3 to the opening 4 in the coke oven 1. While a flange member 9 having a knife-edge-shaped cross section is joined to the edge of the seal plate 6 , a spring loaded plunger 10, which comprises a cylinder and a spring and presses the flange member 9 to the frame 5, is provided on the oven door structure 3. That is, the oven door structure 3 of this invention is adapted to open and close the opening 4 in the coke oven 1 and press the edge of the seal plate 6 to the frame 5.
Reference numeral 11 designates a heat-insulating box that comprises a heat-resistant metal box 12 filled with commonly used heat-insulating refractory materials such as alumina silicate , isolites , carbon woods and ceramics and is attached to the oven door structure 3 via the seal plate 6 or via an inner plate 13 and the seal plate 6 or a slide plate 14. The figure shows an embodiment in which the heat-insulating box 11 is attached with bolts (not shown) to the oven door structure 3 via the inner plate 13 , seal plate 6 and slide plate 14 . Thus , the heat-insulating box 11 protects the seal plate 6 from heat, prevents the release of heat from the oven door structure 3 and preserves the high-temperature heat possessed by the gas generated in the coke oven 1 and circulating on the oven door side thereof . Also, a bottom-less hollow plug 15 to circulate and isolate the gas having high-temperature heat generated in the coke oven 1 is provided on the coke oven side of the oven door structure 3 via the heat-insulating box 11. The bottom-less hollow plug 15 for gas migration and isolation comprises baggy, cylindrical or other appropriately shaped horizontal support frames 16 made of heat-resisting steel or other heat-resisting metals that do not deform under the pressure of the coal particles 2 charged or other external pressures . The horizontal support frames 16 are fitted in the heat-insulating box 11 in such a manner as to partition the box into several spaces one on top of the other. As shown in Fig.
2 , shield bars 17 to prevent the entry of coal particles made of the same material are attached to said horizontal support frames 16 , with small ventilating spaces 18 left on both sides of each bar, either vertically and laterally flush with or vertically staggered from one another. The upper ends of said shield bars 17 are pivotally suspended to the horizontal support frames 16 with bolts or other fasteners 19 so as to be capable of returning to the original position when the bars tilt as a result of expansion or collision with other matters.
Appropriate metals for the heat-resistant box 12 are not only common stainless steels but also cast irons having small thermal expansion coefficients and high heat-resisting strength that deform very little when subjected to repeated heating and cooling and maintain the original shape for a long time . Though the compositions of cast irons are not particularly limited, it is preferable that carbon content is between 3.0 and 3.8 weight percent in order to obtain hard cast irons comprising a mixture of pearlite matrix and graphite, silicon content is between 1.5 and 2.5 weight percent in order to decrease shrinkage and increase hardness and tensile strength, and manganese content is between 0 . 4 and 0 . 8 weight percent in order to increase hardness and tensile strength. It is also preferable to keep the content of phosphorus, which makes beautiful the skin of cast iron, not more than 0.35 weight percent as phosphorus deteriorates tensile strength and the content of sulfur, which deteriorates castability and toughness, with the rest substantially comprising iron. When the bottom-less hollow plug 15 for allowing migration and isolation of gases generated in the oven is formed by placing the shield bars 17 to prevent the entry of coal particles , it is preferable to form a step on the edges of adjoining bars forming narrow gas flues in order to prevent the entry of coal particles 2 through the ventilating spaces 18 provided on both sides into the gas migration and isolation chamber, as shown in Fig. 3.
When the shield bars 17 to prevent the entry of coal particles are placed vertically and laterally flush, the lower end of the upper bar A and the upper end of the lower bar B may be notched to form engaging steps and slidably joined together, with a space S at least equivalent to the expansion margin of the shield bars 17 between the leading ends thereof . Also , a notched groove 21 and a loosely fitting projection 22 may be provided at the lower and upper ends of the mating shield bars 17. Because the upper and lower shield bars 17 having notched engaging steps are joined together smooth without bulging, the shield bars 17 are neither damaged nor deformed by the impact of falling coke during pushing. The shield bars 17 do not twist or swing through mutual interference, too. Provision of the space S between the leading ends of the adjoining shield bars 17 keeps the expanding shield bars 17 , and the hollow plug 15 for gas migration and isolation, in shape for a long time. The profiles of the notched engaging steps are not limited to any particular shape. For example, the shapes of the upper and lower engaging steps illustrated can be interchanged without impairing the effect thereof . It is preferable that the size of the ventilating spaces 18 is determined by considering the expansion margin of the shield bars 17 and the prevention of the entry of coal particles 2. An exhaust pipe to admit and circulate the gases generated in the oven may be provided in the upper part of the bottom-less hollow plug 15 for gas migration and isolation. The bottom-less hollow plug 15 is provided so that the gas generated in the coke oven 1 and admitted through the ventilating spaces 18 on both sides of the shield bars 17 circulate therein and flows out through other ventilating spaces 18 to the coke oven 1 or exhaust pipe.
After the opening 4 of the coke oven 1 is closed by the oven door structure 3 of this invention via the seal plate 7 , as in the conventional coking operation, coal particles 2 are charged into the coke oven 1. Heated by the high-temperature heat supplied from an adjoining combustion furnace ( not shown ) , the coal particles 2 charged in the coke oven 1 gradually change into coke. Then, the hot gas generated by the coal particles 2 changed into the middle of the coke oven 1 flows toward the shield bars 17 , heats the coal particles 2 near the shield bars 17 that have not reached the coking temperature, and flows into the bottom-less hollow plug 15 for gas migration and isolation through the ventilating spaces 18 on both sides of the shield bars 17. The bottom-less hollow plug 15 for gas migration and isolation heated to high temperature by the incoming gas from the coke oven heats the coal particles 2 near the coke oven door via the shield bars 17 . Thus , the coal particles 2 charged near the coke oven door is heated when the gas generated in the oven flows from the middle of the coke oven 1 to the bottom-less hollow plug 15 for gas migration and isolation, and indirectly by the heat released from the heated bottom-less hollow plug 15 for gas migration and isolation through the shield wall.
That is to say, the coke oven door structure according to this invention is designed to heat the coal particles 2 charged near the oven door from the coke oven side and the oven door side . Thus , the oven door according to this invention promotes coking of the coal particles near the oven door and brings the temperature thereof faster than in conventional coke ovens to the coking temperature following the heating rate of the coal particles 2 charged in the middle of the coke oven 1.
The coal particles 2 unavoidably admitted through the ventilating spaces 18 are either gasified without yielding tar or naturally let out through the lower part of the bottom-less gas migration and isolation hollow plug 15.
The adjoining shield bars 17 placed at least on the coke oven side of the gas migration and isolation hollow plug 15 form a narrow ventilating space 18 by mating together the stepped ends thereof , thereby blocking the entry of the coal particles 2 , preventing the yielding and solidification of tar in the gas migration and isolation hollow plug 15, allowing the passage of only the gas generated in the oven, and promoting heating.
The fasteners 19 used for suspending the shield bars 17 becomes burnt in the course of long use or will require considerable time and trouble for removing if chance for replacement is missed. Figs . 5 and 6 are perspective views of vertically joining structures that permit easy replacement of the shield bars 17.
In Fig . 5 , an upper shield bar 17A and a lower shield bar 17B are slidably joined together via smooth notched ends thereof , with a space S left therebetween. While a slot 23 extending in the direction of oven height is provided in the mating surface of the upper shield bar 17A, a downward-extending projection 24 adapted to pass through and engage with said slot 23 is provided at the upper end of the mating surface of the lower shield bar 17B. Also, a projecting stopper 25 adapted to come into contact with the horizontal support frame 16, thereby preventing the breakoff of the lower shield bar 17B that is pushed up too high, is provided in the lower part of the mating surface thereof.
When one or more shield bars 17 engaging with the horizontal support frame 16 and forming the gas migration and isolation hollow plug 15 become unsuitable for use because of deformation or damage, the downward-extending projection 24 is pulled out of the horizontal support frame 16 or removed by turning upward from below after the lower shield bar 17B is pushed up from below along the slot 23 in the upper shield bar 17A. Fig. 6, 7 and 8 show another type of vertically engaging mechanism that permits individually removing each of the shield bars 17 forming the gas migration and isolation hollow plug 15.
Fig. 6 is a perspective view of a fastening mechanism for engaging a shield bar 17 with a horizontal support frame 16.
Fig. 7 is a cross-sectional view of the fastening mechanism shown in Fig. 6 taken in the direction of oven height. Fig.
8 is a perspective view of a horizontal support frame 16 provided in the heat-insulating box 11. The horizontal support frame 16 has a rugged engaging part F. Although the cross-sectional profile of the horizontal support frame is not limited to any particular shape, the swollen tabular profile shown in the figures having a great load-carrying power is preferable for fastening the shield bars 17 and maintaining the stable shape of the gas migration and isolation hollow plug 15.
Two separated hooks 26 adapted to engage with recesses on both sides of a projection on the horizontal support frame 16 are provided at the upper end of the shield bar 17 to restrain the lateral motion of said bar. The lower end of the upper shield bar 17A and the lower shield bar 17B having the two separated hooks 26 at the upper end thereof are engaged together by stepped joints. A space S at least equivalent to the expansion margin of the shield bars 17 is provided between the leading ends of the upper and lower shield bars, as with the embodiment shown in Fig. 5, to accommodate the elongation of the longitudinally expanding shield bars 17 and maintain the shape of the gas migration and isolation hollow plug 15.
Also, a projecting stopper 25 to prevent the breakoff of the shield bar 17 from the horizontal support frame 16 when the shield bar 17 is pushed up too high is provided in the lower part of the mating surface thereof.
As with the joint structure shown in Fig. 5, this joint structure permits removing the damaged shield bar 17 by turning outward from below. Though not particularly limited, a tapered K-shaped profile may be formed at the upper end of the horizontal support frame 16 so as to facilitate the removal of the shield bar 17. Also, a tar drain groove N leading to said space S may be provided on the horizontal support frame side of the lower shield bar 17B to permit natural outflow of the tar collecting in the space S.
The vertical joint structure shown in Fig. 6 is assembled, like the one shown in Fig. 5, so that the damaged shield bar 17 can be easily removed from the horizontal support frame 16 by pulling or turning upward from below. Even if the joint structure of the shield bars 17 changes, as shown in Figs. 5 or 6, coking operation is carried out as in the conventional way.
In order to further temperature rise and prevent tar generation in the bottom-less gas migration and isolation hollow plug 15, one or more vertical nozzle pipes 27 to blow out air, oxygen or other combustible gases to burn the gases generated in the oven and circulating in the gas migration and isolation hollow plug 15 , at certain intervals in the direction of oven height, as shown in Fig. 9. A nozzle 29 formed by constricting, as shown in Fig. 10, the upper end of a vertical pipe 28, which constitutes a portion of the vertical nozzle pipe 27, prevents the accumulation of coal particles unavoidably entering the gas migration and isolation hollow plug 15 and the resulting yielding or tar. An unconstricted lower end 30 allows the coal particles admitted into the vertical pipe 28 to fall without sticking to the inner wall thereof , thus preventing the clogging thereof. That is, the vertical nozzle pipe 27 has a clogging-free structure that permits the combustion gas supplied from a gas supply source (not shown) through a combustion gas supply pipe 31 connected to the midpoint thereof to issue stably for a long time.
The coke oven doors having the vertical nozzle pipes 27 permit carrying out ordinary coking operation while constantly blowing out air or other combustion gases. Also, the quantity of combustion gas for burning the gases generated in the coke oven 1 and admitted into the gas migration and isolation hollow plug 15 can be controlled by controlling the pressure therebetween.
One or more combustion gas injection nozzles of the type shown in Fig. 11 may be provided, at certain intervals in the direction of oven height, in the bottom-less gas migration and isolation hollow plug 15 so as to permit automatic supply of the combustion gas in accordance with pressure changes therein.
Reference numeral 32 in Fig. 11 designates a combustion gas supply pipe. While a nozzle 33 directed to the gas migration and isolation hollow plug is provided at one end of the combustion gas supply pipe 32 , a combustion gas supply source (not shown) is connected to the other end thereof. Besides, a downward opening shutter 35 to cut off the flow of the gases from the nozzle 33 to the gas supply source is provided in a gas passage 34 . A cylinder 36 is fastened to the uppermost point of the combustion gas supply pipe 32. Said downward opening shutter 35 is pivotally connected via a connecting rod 39 to a rod 38 that is connected to the coke oven side of a reciprocating piston 37 sliding in said cylinder 36. A gas migration pipe 40 connects the combustion gas supply pipe 32 between the nozzle 33 and downward opening shutter 35 to the oven door side of the cylinder 36. When the gas migration and isolation hollow plug 15 on the side of the nozzle 33 is filled with a large quantity of gas and the pressure therein rises, the combustion gas injection nozzles moves the rod 38 via the gas migration pipe 40. Then, the connecting rod 39 tilts to move the downward opening shutter 35 from a position indicated by a two-dot chain line to a position indicated by a solid line, thereby closing the combustion gas supply pipe 32. When, by contrast , the gas flowing into the gas migration and isolation hollow plug 15 decreases and the pressure therein drops, the downward opening shutter 35 moves from the position indicated by the solid line to the position indicated by the two-dot chain line to open the combustion gas supply pipe 32 , whereupon the combustion gas from the gas supply source flows through the nozzle 33. The coke oven door having the combustion gas injection nozzle in the gas migration and isolation hollow plug 15 is also permit carrying out the ordinary coking operation described earlier.
The coke oven door of this invention may also have a combustion gas nozzle pipe 41 of the type shown in Fig. 12 to permit automatic supply of combustion gas when the pressure in the bottom-less gas migration and isolation hollow plug 15 drops .
While a nozzle 42 fitted into the bottom-less gas migration and isolation hollow plug 15 is provided at one end, an ovally shaped annular member 45 whose upper end tilts toward a combustion gas supply source and lower end toward the nozzle is provided in a gas passage 44 in a combustion gas supply pipe 43 connected to the combustion gas supply source (not shown). An opening 46 in the annular member 45 is closed from the side of the nozzle 42 by a downward opening shutter 47. One or more combustion gas nozzle pipes 41 just described are provided in the gas migration and isolation hollow plug 15, at certain intervals in the direction of oven height . When the pressure of the gas on the side of the nozzle 42 or in the bottom-less gas migration and isolation hollow plug 15 is high, the downward opening shutter 47 closes the gas passage 44 in the combustion gas supply pipe 43 to stop the supply of the combustion gas. When, by contrast, the pressure of the gas in the bottom-less gas migration and isolation hollow plug 15 is lower than that of the combustion gas , the downward opening shutter 47 is pushed open ( and retreats to the position indicated by a two-dot chain line) , whereupon a large quantity of combustion gas flows into the bottom-less gas migration and isolation hollow plug 15 through the nozzle 42. The quantity of combustion gas supplied can be controlled by controlling the gas supply from the gas supply source, reducing the weight of the downward opening shutter 47 suspended from the upper part of the combustion gas supply pipe 43, or adjusting the angle of inclination of the annular member 45 against which the downward opening shutter 47 rests.
Because the combustion gas supply pipe 32 shown in Fig.
11 or 41 shown in Fig. 12 is used in environments where fine coal particles float, the following problem might arise. When, for example, the combustion gas nozzle pipe 41 of the type shown in Fig. 12 is used for a long time, the fine coal particles admitted to the bottom-less gas migration and isolation hollow plug 15 enters the combustion gas passage on the nozzle side of the combustion gas supply pipe 43 when the supply of the combustion gas is stopped. The accumulated coal particles sludged by the coking heat or the tar solidified therefrom clog the nozzle and prevents the continuation of gas supply. Another combustion gas nozzle pipe shown in Fig. 13 solves the above problem. A combustion gas nozzle pipe 50 shown in Fig. 13 comprises a combustion gas nozzle pipe 43 that is similar to the combustion gas nozzle pipe 41 shown in Fig. 12. Fig. 13 shows a combustion gas nozzle pipe 50 that has a tar reservoir 49 of heat-resisting pipe or other container whose one end communicates with the combustion gas passage 44 in the combustion gas supply pipe 41 that constitutes the combustion gas nozzle pipe 41 shown in Fig. 12 and the other is closed by a lid 48. The tar reservoir 49 is provided on the side of the nozzle 42 and below the combustion gas passage 44. This coke oven cover heating the vicinity thereof has one or more combustion gas nozzle pipes of the type just described in the bottom-less gas migration and isolation hollow plug 15, at certain intervals in the direction of oven height. The tar reservoir 49 in Fig. 13 may be formed by tapering the lower side of the combustion gas supply pipe 43 in such manner as to facilitate the collection of the tar generated on the side of the nozzle 42 in the combustion gas passage 44. The lid 48 provided to facilitate the removal of the collected tar is fastened by thread screw, hinge or other common fastening mechanisms.
If it is necessary to positively burn the gas entering and circulating in the bottom-less gas migration and isolation hollow plug 15 , an ignition device may be provided near the exit of the constricted nozzle 29 in Fig. 10, nozzle 33 in Fig. 11 and nozzle 42 in Figs. 12 and 13.
Industrial Applicability As described above , the coke oven doors according to this invention have a gas migration and isolation hollow plug formed by suspending shield bars to prevent the entry of coal particles on the coke oven side thereof . The coal particles charged near the coke oven door are heated from both sides by the high-temperature gas generated from the coal particles charged in the middle of the coke oven and the heat possessed by the shield bars heated by the gas generated in the coke oven and admitted into said gas migration and isolation hollow plug.
Therefore, the coke oven doors according to this invention significantly reduce the generation of poor-quality coke and yield uniform quality coke. Because the tar produced in the low temperature phase of coking is decomposed by the subsequent rapid temperature rise and remains so little that tar cleaning after each pushing can be finished in a short time. As the gas migration and isolation hollow plug is formed by assembling removable independent shield bars, both vertically and laterally, severely damaged shield bars can be easily replaced and quickly repaired. Also, the tar clogging the ventilating spaces can be easily removed by moving or scrubbing the shield bars in the clogged region. Made of heat-resisting metal members, the shield bars can be reused by machining damaged parts or straightening deformed parts. Even when replaced and scrapped, the shield bars can be recycled as materials for steelmaking.
the coke oven by: the thermal,ig':,conductive metal wall const~.-, v tuting said Boar and moving. ~~j~i~t ~of said hot gas to an upper .. ....;:,::. ..:
end region in co Itact ~,rith sa~d~'p~rtition wall therethrough by . , i , ......., :.. .
the ascending of said gas ~ ~adv the heat conductivity of the . ,. ~. ::. _v-':~~:; '~.
partit3.on wall' ~ A "coke oveiu:'>aoox varr~.~.ag on the inner side thereof a shield lallowirrg pass~ge~af gases generated 3.a the oven .~:: ;.~~~; y:.'. ,... , that aompriaes 'shielding metub~Ts'.made up of spacers arid ~col~..ng plates' disc7.osed in Japan~~e'~Wamined pa.tesnt Publication (Koukoku) No. 61 ~ 49353 (Japanesevapplication filed in 1983,) ~was~
developed based li on the above=c'~e'scribed method . Many other . i; . .. ., . . ., ~;., ._...
heat-up cope oven doors hay~~vbeea developed, such as a 'co7re' oven door comprising a sh~.gld"rattached to the inner side of the oven wall via fi~ting$ to foratravspace for gas pa.ssagg and made up of multiple . ~h~.eld. msmli~r~ axaving vertically partitioned U-shaped cross ~ actions' ldiso~iis~d in Japanese Unexamined' ~~~.
Patent Pub~.iication (Ko~cai,) ~No:~'62-72782 (Japanese application . . I. -.-: .:~,,_:.',.. : .
filed in 1986).la 'coke oveu'door comprising hsat~-xesiating ,.:,:;:'_' . .. .
. : . r, :4.. .
. ,'.::. ~_.~;-; . , v packiags attached to both s~:d~s'ot the cake oven walls ' ..
comprising metal shields provided. on the inside of the oven door j- '~~,~: ~ .
proper via spacers to fozm y;vs~i'aee for gas passage" disclosed (; :. ~.v...
in Japanese Bxaniined Utilit-y:~o8e1 Publication ( Kc~ulsoku ) No ,: .,~ _~:.~ .s.;,;; ,.
06-43146 ( Japanese appliaatio~: filed in .1~$8 ) , and ~. 'coke oven ~; ,...... ; ., Boar with ceram3:c coking plate~r' disclosed in Japanese Unexamined Util3ay Model Pub'lfcatiox~ (Kokai) No. 02~~994fi . ;. .. ~ Japanese. application files 4~~~. ~~9881 - Japanese ~xamined~~ , , Pateat. Publicat~~on (Koukoku:).ll~To_ ~~05-38795 (Japanese applica- .
tion filed in,19,a~6 ) d3.sclosas;~;.:'G~ke even door heated by raising .;.. , ; _.,;.;.;,: ...
the temperaturQ of a gas spe.G~;.~~by~.ded between a heat insulstor~
:a:
attaahsd to 'the even door aad' a.'l~~ating plate on the inner 'side . , ~. , :,~ ..:,.;: ,.. .
of the oven b burnin Y g, part . of,comT~uBtible ,gas~s generated ~by .y.~;-.F.v~.,~~_:.. . .. ' coking with the ' air and oxgges~, blown in from outsid~x" . ' , Also, several poke ~~~reri-.doors having a gas flue to pays' v . j' _;v:,:~;.;:;,~;:,s,..... . ..,..
the gases generaited i n tha~ o~ea~,'or one 3.~naorporating a heat3.ag v.
burner. in plat ~ of the c~d~vei~itional x~afra,ctory bricks, vn the ,' , ' cokin chamber ~ ide '~:~.
g i, thereof ~x~.vve~ been introduced as those ,..:::::;~, ;,;
: promoting the t I perature iiiQr-ease of coal particles charged . . . . , ...:r:.,.'I . .. .
near the coke over doors. 'Fax~,.~example,~ Japaaese Kxami.ned Utility l~Odel i~ublication (~Co...~ca'7cu) No. 02.-2.6913 and Japanese:
Unexamined Utility Model '~catioa (~Cokai) No_ 06--43146 i. : ..;:: v'" '~ :~ ' .
_..;, disclose a coke :oven doar..i~omprising a metal gas flue shield ..':
. attached to the :oven prop~~'via: ~a hea.~-iasulating box made of~
. . . . j; : ; ..:..~;.;; :°' °,, a heat-lT.suTati.ng ma.te~ial.~:~~~~ed with steal sheet" .
I; ;:=.: ': ' :~:.
Japanese FY~e~ Patent Fubhication (~oul~oku) No. 63-112686 discloses a 'combustion type-~ca7ce oven door that burns, in. the .' . ,.
gas space enolosed by metalv,~hield,, part of combustible gases.
generated duriagl coking cyc:3:e~:~~iiith the ai.r or oxygen blowri.v.n :_ .~;.t'.: .:.:
from outside. These newly,~de~eloped coke oven doors are expected to deor~ase the geaeration of poor-guality coke and ;.a= -; : ..
tar as they heat the coal part~ale~s~ near the coke oven door plugs .
.. .:_.
by the high.-temperature heat'~b~:'the gases generated in the oven ;, : :., :.,,;,, :, by providing shi~ids or space~~o~es li7ce gas flues to allow tk~e ;: ; : ; ,;~;~.,,_;,,: . , ., . ., passage of such gases to the .c~il~es oven doors. However, none of the~t have., yet been put~,~i.ao.tcs.; ~praatical use.
Though note certaia, . ttte.;finventar presumes that suah tsolce ~' .
.:.~.:=r...-.,,.
~'.:r:; .:::'' oven doors have 3involved th~svfo7~owing problems: Conventional space boxes aomp~ ise fabriaateclv: thin metal shield boxes having small as vents _~ Becausevthe~:lover of ases~ ~enerated in the :~
g g g .
Qven is thus limited, the temperature . is the space box do~s .not . ~ ~ .
rise high enough~;to raise the'=temperature .of the coal particles - , ~~
near thm coke oven door to tliea"ezpeote~d level. The sludgy tat' generated duriu ~, coking cyicl~:Mows into the narrow vents snd . ~.
..,.;.; ;:,:;._;..:: , clogs them by solidifying. ~Rgvcpening of the tar vents slogged ' w w j.:.'.-::r . .
by the tar must j;be done quiry,:.in an environment that st37.1 .'.:
retains high temperature. of :er: .pushing. Besides the space boxes have suahl; struatura.Z ~'p~oble~s a.s~; deforming under the ~ . y , influence of th~rmal stres$e~s'~due~ tc~ frequent heating anc3, :.: v.
cooling repeate~ and cracYiugvs~arting from metal sheet ~o~ nts and progagatiag to other area~':.~~~..
I
I. -Object of the Invention i r.' . . ~. .:
The iaventor invented aeret~:~co7te oven doom that gcrntit long stable operatxonl and give ~enoug~~time to repa~c cols~ng chamber damages during push~g cycle"'time by solving 'the .
I
above-mentioned !aonvention~ y~i~abTe:ms such as generation of I. ... , poor-quality col~ce near the aclce~v~sren door$ linedwiiith refractory.
blocks or bricks!: and d:iffiaul~y;~rt use of coke oven doors with hollow type metal plugs.
Suu~ary of the Invention '' ~ ~ . ~ .
Through m I' y e~perime~iit.'aad studies intended for the".
~ :, _:~~;;. y ~..; ..
i .;; .: ~ . _ . ... ..
achievement of ~asd ob,~eat~;... tIie:~~inventor disao~T~red that .~
~_ . :. ...'-y, :.. . .. .
provi$ioa of an vinwelded oh~bsi'to ci.raulate ~a~td isolate ~gases~
I' ~.::~,~,~:,:~ . , generated iuv the oven, whia'h~':cbmprisea a shielding wall notiade up of vertically: and lateralLy:3i~stapcrsed metal shield bars ta.
;.;~:,:~:;:,~;:~
prevent the inflow of coal paiiales, with minute slits provided .,..,.,:-.~...
on both s~.des thereof, on :~i:~~:yauer. or coking chamber side 'of the coke oven door ~l.lows_ .t~.e.vvlarge guantities of gases generated in the' cope oven.. a~"'s~.'y.z~taln3.ng high heat to d~cectly~
heat the coal p~rtiales cha~ge'd: near the coke oven door while flowing through the coal pa.aicles ~ to said migration and isolation chamber . The gaae~. generated ~.ya the coke ovea and '' r -flourino into s~i~r7 miaratio7rY ~,'~~tpiat~.on ahambAr thxough Wid v'7.. .
i: ~ _ ~;~:~r.~:~
minute slits an both sides~yo~':'the vertically and laterally' juxtaposed shield bars wittivut' b'eix~g inhibited raises the temperature is ~ai.d migratiou~. and 3.solation chamber and directly k~eat tla:~e coa,1 partiGl$s~ near the coke oven door via I.
:~....~_!.'r':.
said shielding w~7.1 of metal, ~~ti3el~~ bars . That is , the inver~tor discovered that i~he heatiag colcs;"voven Boar sandwiching the opal' particles near the coke ove~',~doo~ from betm~en. the coke o~cren I, ,..:-. :.,.; .-. .
I; °i..s-''.,:_.;i..... ~ .
and oven door sides promot~s:':;#~.eating and caking of tha csoal' particles near ~e cake ovezi.?~'doar and g~ceatly prevex~ts the .- ..::..<., generat~.on and adhesion of~ vt'~r:: ~. .
A cope, oven door for':promio-tl.ng teucperature increase,~ia ,: . ,. : ;; :. ; ,:. :. .. .
the viainit~r , of '"door plugs..acccirdz.ng to the present invention p ~, :,,:: ;::,:;-:.;-:.:--v:. .
based on the ab ~~ vre fj.nding:,, '~i~prises a hee.,t-insulating boy .~
:; .;.'.,.. .
provided oa the I inner Aide ~'o~';v.oven door structure adapted ~..; .~~..: e: .
. . ..a,', .'_::.,-; ..
to open and claw a door jaiub:':~:n:vfih~e colts oven Charged with coal "-~~.w<';r ' particles via a, seal platc~~~i~cesssed agaiast~ said door jamb, .
u.,..l:...
_. '~..;. : ..:?:: ~' ' s.w,. : ~,..
horizontal support frames. ~p~pvid.~d to partition the height ~of i said heat-insul~.ting, bay :3ntv~"multiply sections, and a .
,.: ., ; . .. ._;.
:.:'-,: °.: ~; ..
bottom-less gas migratiouv'~a~8~~~.solatiou chamber formed by , I. ._ .. '~i:~
;.._i 5, y. ,, ..
arranging shier bars to, pxeveaiit , the ~ entry of , coal pait3ale~s , .
laterally and vertica7.ly ~oith;sm~il ventilating spaoes' left on I; :-.:. .~;:~.~ :,-:. ~ . . .
both sides thereof, to fill':tlze;'spaaes betv~een said horizontal .;.. :.
'::~~;:;;.:. ' support frames . ~' with the' up~~, e:i.d thereof pivotally fastened to said horisontal suppar~~:f~a~tt~s'_ , Also, adjoining ends of at " :~:y:._.,~~.V~ ...
least the sluel~d bars to ~pre~~nt, the entrg of coal particles arranged on the coke oven side of the bottom-less gas migration and isolation chamber are joined, if required, by stepped joints, with small ventilating spaces left therebetween. A coke oven door to promote temperature rise in the vicinity thereof also may also have the mating ends of the vertically arranged shield bars, i.e. the lower end of said upper bar and the upper end of said lower bar movably joined together by forming notched cross-sections, with a notched mating groove directed toward said gas migration and isolation chamber provided on one of the mating ends and a loosely fitting projection on the other.
A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, upper shield bars fitted in spaces in said heat-insulating box partitioned by horizontal support frames having a slot extending in the direction of oven height and provided in the mating surface of the lower end thereof, lower shield bars having a downward-extending projection adapted to pass through and engaging with said slot and a projecting stopper adapted to come in contact with the lower end of said horizontal support frame provided in the lower end thereof.
A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, horizontal support frames having a rugged engaging portion at the upper edge and provided to partition the height of said heat-insulating box into multiple sections, and a bottom-less gas migration and isolation chamber formed by putting together, both vertically and laterally, shield bars having two separated hooks adapted to engage with the dents on both sides of a projection on said horizontal support frame by stepped joints, with small ventilating spaces provided on both sides thereof and vertical sliding spaces on the projecting side of both stepped joints, and a projecting stopper to prevent the breakoff of the shield bar by coming into contact with said horizontal support frame provided in the lower part of the shield bar.
A coke oven door to promote temperature rise in the vicinity thereof also has a cast-iron box containing a heat-insulating material between the oven door structure and the bottom-less gas migration and isolation chamber.
A coke oven door to promote temperature rise in the vicinity thereof has one or more vertical nozzle pipes separately provided in the bottom-less gas migration and isolation chamber, each of said vertical nozzle pipes comprising a gas nozzle in the upper part , a coal dust chute in the lower part , a combustion gas supply pipe communicating with a combustion gas supply ~0 source provided therebetween,.
A coke oven door to promote temperature rise in the vicinity thereof has one or more combustion gas injection nozzles separately provided in the bottom-less gas migration and isolation chamber, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation chamber at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, a cylinder fastened to the uppermost point of said combustion gas nozzle pipe, said downward opening shutter movably connected via a movable connecting rod to a rod connected to the coke oven side of a piston reciprocating in said cylinder, and a gas flow pipe connecting the combustion gas pipe nozzle between said nozzle and downward opening shutter and the oven door side of said cylinder.
Another coke oven door to promote temperature rise in the vicinity thereof has one or more combustion gas nozzle pipes separately provided in the bottom-less gas migration and isolation chamber, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation chamber at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, an ovally shaped annular member whose upper end tilts toward a combustion gas supply source and lower end toward the nozzle, and a downward opening shutter closing an opening in said annular member from the side of the nozzle.
Yet another coke oven door to promote temperature rise in the vicinity thereof has a tar reservoir communicating with the combustion gas passage at one end and having a closing lid at the other is provided below one or more combustion gas supply pipe or combustion gas nozzle pipe separated provided in the bottom-less gas migration and isolation chamber.
Brief Description of the Drawings Fig. 1 is a cross-sectional view of a coke oven door according to this invention taken in the direction of oven height.
Fig. 2 is a partially omitted, enlarged perspective view taken along the line A-A of Fig. 1.
Fig. 3 is a cross-sectional perspective view of another embodiment of this invention in which shield bars to prevent the entry of coal particles are placed one next to another.
Fig. 4 is a perspective view of a joint mechanism for joining together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 5 is a perspective view of a fastening mechanism for fastening together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 6 is a perspective view of a fastening mechanism for fastening together shield bars to prevent the entry of coal particles placed one on top of another.
Fig. 7 is a cross-sectional view of the fastening mechanism shown in Fig. 6 taken in the direction of oven height.
Fig. 8 is a perspective view of a horizontal support frame used in the fastening mechanism of Fig. 6.
Fig. 9 is a cross-sectional view of another embodiment of this invention with a bottom-less chamber for allowing migration and isolation of gases generated in the oven having a vertical nozzle pipe provided in the direction of oven height .
Fig. 10 is an enlarged cross-sectional view of the vertical nozzle pipe shown in Fig. 9.
Fig. 11 is an enlarged cross-sectional view of a burning gas nozzle provided in the bottom-less chamber for allowing migration and isolation of gases generated in the oven.
Fig. 12 is an enlarged cross-sectional view of a burning gas nozzle provided in the bottom-less chamber for allowing migration and isolation of gases generated in the oven.
Fig. 13 is a scaled-down view of another burning gas nozzle pipe in which a tar container is provided in the nozzle-side burning gas flue of the burning gas nozzle pipe shown in Fig.
12.
Fig. 14 is a partially exploded perspective view of the basic structure of a conventional coke oven.
Preferred Embodiments of the Invention Details of this invention will be described by reference to the drawings.
Fig. 1 is a cross-sectional view showing an embodiment of this invention in the direction of oven height. Fig. 2 is a partially omitted, enlarged perspective view taken along the line A-A of Fig. 1. In Fig. 1, reference numeral 1 designates a coke oven , 2 coal particles charged in the coke oven 1, 3 an oven door structure that opens and closes an opening 4 in the coke oven 1. The oven door structure 3 comprises a sturdy cast iron frame 5 reinforced with flanges and is adapted to open and close the opening 4 in the coke oven 1 via a seal plate 7 that presses an door jamb 6 of the coke oven 1. Reference numeral 8 denotes a latch that comprises compression springs, screw bolts and other fastening members and presses and fastens the oven door structure 3 to the opening 4 in the coke oven 1. While a flange member 9 having a knife-edge-shaped cross section is joined to the edge of the seal plate 6 , a spring loaded plunger 10, which comprises a cylinder and a spring and presses the flange member 9 to the frame 5, is provided on the oven door structure 3. That is, the oven door structure 3 of this invention is adapted to open and close the opening 4 in the coke oven 1 and press the edge of the seal plate 6 to the frame 5.
Reference numeral 11 designates a heat-insulating box that comprises a heat-resistant metal box 12 filled with commonly used heat-insulating refractory materials such as alumina silicate , isolites , carbon woods and ceramics and is attached to the oven door structure 3 via the seal plate 6 or via an inner plate 13 and the seal plate 6 or a slide plate 14. The figure shows an embodiment in which the heat-insulating box 11 is attached with bolts (not shown) to the oven door structure 3 via the inner plate 13 , seal plate 6 and slide plate 14 . Thus , the heat-insulating box 11 protects the seal plate 6 from heat, prevents the release of heat from the oven door structure 3 and preserves the high-temperature heat possessed by the gas generated in the coke oven 1 and circulating on the oven door side thereof . Also, a bottom-less hollow plug 15 to circulate and isolate the gas having high-temperature heat generated in the coke oven 1 is provided on the coke oven side of the oven door structure 3 via the heat-insulating box 11. The bottom-less hollow plug 15 for gas migration and isolation comprises baggy, cylindrical or other appropriately shaped horizontal support frames 16 made of heat-resisting steel or other heat-resisting metals that do not deform under the pressure of the coal particles 2 charged or other external pressures . The horizontal support frames 16 are fitted in the heat-insulating box 11 in such a manner as to partition the box into several spaces one on top of the other. As shown in Fig.
2 , shield bars 17 to prevent the entry of coal particles made of the same material are attached to said horizontal support frames 16 , with small ventilating spaces 18 left on both sides of each bar, either vertically and laterally flush with or vertically staggered from one another. The upper ends of said shield bars 17 are pivotally suspended to the horizontal support frames 16 with bolts or other fasteners 19 so as to be capable of returning to the original position when the bars tilt as a result of expansion or collision with other matters.
Appropriate metals for the heat-resistant box 12 are not only common stainless steels but also cast irons having small thermal expansion coefficients and high heat-resisting strength that deform very little when subjected to repeated heating and cooling and maintain the original shape for a long time . Though the compositions of cast irons are not particularly limited, it is preferable that carbon content is between 3.0 and 3.8 weight percent in order to obtain hard cast irons comprising a mixture of pearlite matrix and graphite, silicon content is between 1.5 and 2.5 weight percent in order to decrease shrinkage and increase hardness and tensile strength, and manganese content is between 0 . 4 and 0 . 8 weight percent in order to increase hardness and tensile strength. It is also preferable to keep the content of phosphorus, which makes beautiful the skin of cast iron, not more than 0.35 weight percent as phosphorus deteriorates tensile strength and the content of sulfur, which deteriorates castability and toughness, with the rest substantially comprising iron. When the bottom-less hollow plug 15 for allowing migration and isolation of gases generated in the oven is formed by placing the shield bars 17 to prevent the entry of coal particles , it is preferable to form a step on the edges of adjoining bars forming narrow gas flues in order to prevent the entry of coal particles 2 through the ventilating spaces 18 provided on both sides into the gas migration and isolation chamber, as shown in Fig. 3.
When the shield bars 17 to prevent the entry of coal particles are placed vertically and laterally flush, the lower end of the upper bar A and the upper end of the lower bar B may be notched to form engaging steps and slidably joined together, with a space S at least equivalent to the expansion margin of the shield bars 17 between the leading ends thereof . Also , a notched groove 21 and a loosely fitting projection 22 may be provided at the lower and upper ends of the mating shield bars 17. Because the upper and lower shield bars 17 having notched engaging steps are joined together smooth without bulging, the shield bars 17 are neither damaged nor deformed by the impact of falling coke during pushing. The shield bars 17 do not twist or swing through mutual interference, too. Provision of the space S between the leading ends of the adjoining shield bars 17 keeps the expanding shield bars 17 , and the hollow plug 15 for gas migration and isolation, in shape for a long time. The profiles of the notched engaging steps are not limited to any particular shape. For example, the shapes of the upper and lower engaging steps illustrated can be interchanged without impairing the effect thereof . It is preferable that the size of the ventilating spaces 18 is determined by considering the expansion margin of the shield bars 17 and the prevention of the entry of coal particles 2. An exhaust pipe to admit and circulate the gases generated in the oven may be provided in the upper part of the bottom-less hollow plug 15 for gas migration and isolation. The bottom-less hollow plug 15 is provided so that the gas generated in the coke oven 1 and admitted through the ventilating spaces 18 on both sides of the shield bars 17 circulate therein and flows out through other ventilating spaces 18 to the coke oven 1 or exhaust pipe.
After the opening 4 of the coke oven 1 is closed by the oven door structure 3 of this invention via the seal plate 7 , as in the conventional coking operation, coal particles 2 are charged into the coke oven 1. Heated by the high-temperature heat supplied from an adjoining combustion furnace ( not shown ) , the coal particles 2 charged in the coke oven 1 gradually change into coke. Then, the hot gas generated by the coal particles 2 changed into the middle of the coke oven 1 flows toward the shield bars 17 , heats the coal particles 2 near the shield bars 17 that have not reached the coking temperature, and flows into the bottom-less hollow plug 15 for gas migration and isolation through the ventilating spaces 18 on both sides of the shield bars 17. The bottom-less hollow plug 15 for gas migration and isolation heated to high temperature by the incoming gas from the coke oven heats the coal particles 2 near the coke oven door via the shield bars 17 . Thus , the coal particles 2 charged near the coke oven door is heated when the gas generated in the oven flows from the middle of the coke oven 1 to the bottom-less hollow plug 15 for gas migration and isolation, and indirectly by the heat released from the heated bottom-less hollow plug 15 for gas migration and isolation through the shield wall.
That is to say, the coke oven door structure according to this invention is designed to heat the coal particles 2 charged near the oven door from the coke oven side and the oven door side . Thus , the oven door according to this invention promotes coking of the coal particles near the oven door and brings the temperature thereof faster than in conventional coke ovens to the coking temperature following the heating rate of the coal particles 2 charged in the middle of the coke oven 1.
The coal particles 2 unavoidably admitted through the ventilating spaces 18 are either gasified without yielding tar or naturally let out through the lower part of the bottom-less gas migration and isolation hollow plug 15.
The adjoining shield bars 17 placed at least on the coke oven side of the gas migration and isolation hollow plug 15 form a narrow ventilating space 18 by mating together the stepped ends thereof , thereby blocking the entry of the coal particles 2 , preventing the yielding and solidification of tar in the gas migration and isolation hollow plug 15, allowing the passage of only the gas generated in the oven, and promoting heating.
The fasteners 19 used for suspending the shield bars 17 becomes burnt in the course of long use or will require considerable time and trouble for removing if chance for replacement is missed. Figs . 5 and 6 are perspective views of vertically joining structures that permit easy replacement of the shield bars 17.
In Fig . 5 , an upper shield bar 17A and a lower shield bar 17B are slidably joined together via smooth notched ends thereof , with a space S left therebetween. While a slot 23 extending in the direction of oven height is provided in the mating surface of the upper shield bar 17A, a downward-extending projection 24 adapted to pass through and engage with said slot 23 is provided at the upper end of the mating surface of the lower shield bar 17B. Also, a projecting stopper 25 adapted to come into contact with the horizontal support frame 16, thereby preventing the breakoff of the lower shield bar 17B that is pushed up too high, is provided in the lower part of the mating surface thereof.
When one or more shield bars 17 engaging with the horizontal support frame 16 and forming the gas migration and isolation hollow plug 15 become unsuitable for use because of deformation or damage, the downward-extending projection 24 is pulled out of the horizontal support frame 16 or removed by turning upward from below after the lower shield bar 17B is pushed up from below along the slot 23 in the upper shield bar 17A. Fig. 6, 7 and 8 show another type of vertically engaging mechanism that permits individually removing each of the shield bars 17 forming the gas migration and isolation hollow plug 15.
Fig. 6 is a perspective view of a fastening mechanism for engaging a shield bar 17 with a horizontal support frame 16.
Fig. 7 is a cross-sectional view of the fastening mechanism shown in Fig. 6 taken in the direction of oven height. Fig.
8 is a perspective view of a horizontal support frame 16 provided in the heat-insulating box 11. The horizontal support frame 16 has a rugged engaging part F. Although the cross-sectional profile of the horizontal support frame is not limited to any particular shape, the swollen tabular profile shown in the figures having a great load-carrying power is preferable for fastening the shield bars 17 and maintaining the stable shape of the gas migration and isolation hollow plug 15.
Two separated hooks 26 adapted to engage with recesses on both sides of a projection on the horizontal support frame 16 are provided at the upper end of the shield bar 17 to restrain the lateral motion of said bar. The lower end of the upper shield bar 17A and the lower shield bar 17B having the two separated hooks 26 at the upper end thereof are engaged together by stepped joints. A space S at least equivalent to the expansion margin of the shield bars 17 is provided between the leading ends of the upper and lower shield bars, as with the embodiment shown in Fig. 5, to accommodate the elongation of the longitudinally expanding shield bars 17 and maintain the shape of the gas migration and isolation hollow plug 15.
Also, a projecting stopper 25 to prevent the breakoff of the shield bar 17 from the horizontal support frame 16 when the shield bar 17 is pushed up too high is provided in the lower part of the mating surface thereof.
As with the joint structure shown in Fig. 5, this joint structure permits removing the damaged shield bar 17 by turning outward from below. Though not particularly limited, a tapered K-shaped profile may be formed at the upper end of the horizontal support frame 16 so as to facilitate the removal of the shield bar 17. Also, a tar drain groove N leading to said space S may be provided on the horizontal support frame side of the lower shield bar 17B to permit natural outflow of the tar collecting in the space S.
The vertical joint structure shown in Fig. 6 is assembled, like the one shown in Fig. 5, so that the damaged shield bar 17 can be easily removed from the horizontal support frame 16 by pulling or turning upward from below. Even if the joint structure of the shield bars 17 changes, as shown in Figs. 5 or 6, coking operation is carried out as in the conventional way.
In order to further temperature rise and prevent tar generation in the bottom-less gas migration and isolation hollow plug 15, one or more vertical nozzle pipes 27 to blow out air, oxygen or other combustible gases to burn the gases generated in the oven and circulating in the gas migration and isolation hollow plug 15 , at certain intervals in the direction of oven height, as shown in Fig. 9. A nozzle 29 formed by constricting, as shown in Fig. 10, the upper end of a vertical pipe 28, which constitutes a portion of the vertical nozzle pipe 27, prevents the accumulation of coal particles unavoidably entering the gas migration and isolation hollow plug 15 and the resulting yielding or tar. An unconstricted lower end 30 allows the coal particles admitted into the vertical pipe 28 to fall without sticking to the inner wall thereof , thus preventing the clogging thereof. That is, the vertical nozzle pipe 27 has a clogging-free structure that permits the combustion gas supplied from a gas supply source (not shown) through a combustion gas supply pipe 31 connected to the midpoint thereof to issue stably for a long time.
The coke oven doors having the vertical nozzle pipes 27 permit carrying out ordinary coking operation while constantly blowing out air or other combustion gases. Also, the quantity of combustion gas for burning the gases generated in the coke oven 1 and admitted into the gas migration and isolation hollow plug 15 can be controlled by controlling the pressure therebetween.
One or more combustion gas injection nozzles of the type shown in Fig. 11 may be provided, at certain intervals in the direction of oven height, in the bottom-less gas migration and isolation hollow plug 15 so as to permit automatic supply of the combustion gas in accordance with pressure changes therein.
Reference numeral 32 in Fig. 11 designates a combustion gas supply pipe. While a nozzle 33 directed to the gas migration and isolation hollow plug is provided at one end of the combustion gas supply pipe 32 , a combustion gas supply source (not shown) is connected to the other end thereof. Besides, a downward opening shutter 35 to cut off the flow of the gases from the nozzle 33 to the gas supply source is provided in a gas passage 34 . A cylinder 36 is fastened to the uppermost point of the combustion gas supply pipe 32. Said downward opening shutter 35 is pivotally connected via a connecting rod 39 to a rod 38 that is connected to the coke oven side of a reciprocating piston 37 sliding in said cylinder 36. A gas migration pipe 40 connects the combustion gas supply pipe 32 between the nozzle 33 and downward opening shutter 35 to the oven door side of the cylinder 36. When the gas migration and isolation hollow plug 15 on the side of the nozzle 33 is filled with a large quantity of gas and the pressure therein rises, the combustion gas injection nozzles moves the rod 38 via the gas migration pipe 40. Then, the connecting rod 39 tilts to move the downward opening shutter 35 from a position indicated by a two-dot chain line to a position indicated by a solid line, thereby closing the combustion gas supply pipe 32. When, by contrast , the gas flowing into the gas migration and isolation hollow plug 15 decreases and the pressure therein drops, the downward opening shutter 35 moves from the position indicated by the solid line to the position indicated by the two-dot chain line to open the combustion gas supply pipe 32 , whereupon the combustion gas from the gas supply source flows through the nozzle 33. The coke oven door having the combustion gas injection nozzle in the gas migration and isolation hollow plug 15 is also permit carrying out the ordinary coking operation described earlier.
The coke oven door of this invention may also have a combustion gas nozzle pipe 41 of the type shown in Fig. 12 to permit automatic supply of combustion gas when the pressure in the bottom-less gas migration and isolation hollow plug 15 drops .
While a nozzle 42 fitted into the bottom-less gas migration and isolation hollow plug 15 is provided at one end, an ovally shaped annular member 45 whose upper end tilts toward a combustion gas supply source and lower end toward the nozzle is provided in a gas passage 44 in a combustion gas supply pipe 43 connected to the combustion gas supply source (not shown). An opening 46 in the annular member 45 is closed from the side of the nozzle 42 by a downward opening shutter 47. One or more combustion gas nozzle pipes 41 just described are provided in the gas migration and isolation hollow plug 15, at certain intervals in the direction of oven height . When the pressure of the gas on the side of the nozzle 42 or in the bottom-less gas migration and isolation hollow plug 15 is high, the downward opening shutter 47 closes the gas passage 44 in the combustion gas supply pipe 43 to stop the supply of the combustion gas. When, by contrast, the pressure of the gas in the bottom-less gas migration and isolation hollow plug 15 is lower than that of the combustion gas , the downward opening shutter 47 is pushed open ( and retreats to the position indicated by a two-dot chain line) , whereupon a large quantity of combustion gas flows into the bottom-less gas migration and isolation hollow plug 15 through the nozzle 42. The quantity of combustion gas supplied can be controlled by controlling the gas supply from the gas supply source, reducing the weight of the downward opening shutter 47 suspended from the upper part of the combustion gas supply pipe 43, or adjusting the angle of inclination of the annular member 45 against which the downward opening shutter 47 rests.
Because the combustion gas supply pipe 32 shown in Fig.
11 or 41 shown in Fig. 12 is used in environments where fine coal particles float, the following problem might arise. When, for example, the combustion gas nozzle pipe 41 of the type shown in Fig. 12 is used for a long time, the fine coal particles admitted to the bottom-less gas migration and isolation hollow plug 15 enters the combustion gas passage on the nozzle side of the combustion gas supply pipe 43 when the supply of the combustion gas is stopped. The accumulated coal particles sludged by the coking heat or the tar solidified therefrom clog the nozzle and prevents the continuation of gas supply. Another combustion gas nozzle pipe shown in Fig. 13 solves the above problem. A combustion gas nozzle pipe 50 shown in Fig. 13 comprises a combustion gas nozzle pipe 43 that is similar to the combustion gas nozzle pipe 41 shown in Fig. 12. Fig. 13 shows a combustion gas nozzle pipe 50 that has a tar reservoir 49 of heat-resisting pipe or other container whose one end communicates with the combustion gas passage 44 in the combustion gas supply pipe 41 that constitutes the combustion gas nozzle pipe 41 shown in Fig. 12 and the other is closed by a lid 48. The tar reservoir 49 is provided on the side of the nozzle 42 and below the combustion gas passage 44. This coke oven cover heating the vicinity thereof has one or more combustion gas nozzle pipes of the type just described in the bottom-less gas migration and isolation hollow plug 15, at certain intervals in the direction of oven height. The tar reservoir 49 in Fig. 13 may be formed by tapering the lower side of the combustion gas supply pipe 43 in such manner as to facilitate the collection of the tar generated on the side of the nozzle 42 in the combustion gas passage 44. The lid 48 provided to facilitate the removal of the collected tar is fastened by thread screw, hinge or other common fastening mechanisms.
If it is necessary to positively burn the gas entering and circulating in the bottom-less gas migration and isolation hollow plug 15 , an ignition device may be provided near the exit of the constricted nozzle 29 in Fig. 10, nozzle 33 in Fig. 11 and nozzle 42 in Figs. 12 and 13.
Industrial Applicability As described above , the coke oven doors according to this invention have a gas migration and isolation hollow plug formed by suspending shield bars to prevent the entry of coal particles on the coke oven side thereof . The coal particles charged near the coke oven door are heated from both sides by the high-temperature gas generated from the coal particles charged in the middle of the coke oven and the heat possessed by the shield bars heated by the gas generated in the coke oven and admitted into said gas migration and isolation hollow plug.
Therefore, the coke oven doors according to this invention significantly reduce the generation of poor-quality coke and yield uniform quality coke. Because the tar produced in the low temperature phase of coking is decomposed by the subsequent rapid temperature rise and remains so little that tar cleaning after each pushing can be finished in a short time. As the gas migration and isolation hollow plug is formed by assembling removable independent shield bars, both vertically and laterally, severely damaged shield bars can be easily replaced and quickly repaired. Also, the tar clogging the ventilating spaces can be easily removed by moving or scrubbing the shield bars in the clogged region. Made of heat-resisting metal members, the shield bars can be reused by machining damaged parts or straightening deformed parts. Even when replaced and scrapped, the shield bars can be recycled as materials for steelmaking.
Claims (10)
1. ~A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, horizontal support frames provided to partition the height of said heat-insulating box into multiple sections, and a bottom-less gas migration and isolation chamber formed by arranging shield bars to prevent the entry of coal particles, laterally and vertically with small ventilating spaces left on both sides thereof, to fill the spaces between said horizontal support frames, with the upper end thereof pivotally fastened to said horizontal support frames.
2. ~A coke oven door to promote temperature rise in the vicinity thereof according to claim 1, in which adjoining ends of at least the shield bars to prevent the entry of coal particles arranged on the coke oven side of the bottom-less gas migration and isolation hollow plug are joined by stepped joints, with small ventilating spaces left therebetween.
3. ~A coke oven door to promote temperature rise in the vicinity thereof according to claim 1 or 2, in which the lower end of said upper bar and the upper end of said lower bar are movably joined together by forming notched cross-sections, with a notched mating groove directed toward said gas migration and isolation hollow plug provided on one of the mating ends and a loosely fitting projection on the other.
4. ~A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, upper shield bars fitted in spaces in said heat-insulating box partitioned by horizontal support frames having a slot extending in the direction of oven height and provided in the mating surface of the lower end thereof, lower shield bars having a downward-extending projection adapted to pass through and engaging with said slot and a projecting stopper adapted to come in contact with the lower end of said horizontal support frame provided in the lower end thereof.
5. ~A coke oven door to promote temperature rise in the vicinity thereof which comprises a heat-insulating box provided on the inner side of an oven door structure adapted to open and close a door jamb in the coke oven charged with coal particles via a seal plate pressed against said door jamb, horizontal support frames having a rugged engaging portion at the upper edge and provided to partition the height of said heat-insulating box into multiple sections, and a bottom-less gas migration and isolation hollow plug formed by putting together, both vertically and laterally, shield bars having two separated hooks adapted to engage with the dents on both sides of a projection on said horizontal support frame by stepped joints, with small ventilating spaces provided on both sides thereof and vertical sliding spaces on the projecting side of both stepped joints, and a projecting stopper to prevent the breakoff of the shield bar by coming into contact with said horizontal support frame provided in the lower part of the shield bar.
6. ~A coke oven door to promote temperature rise in the vicinity thereof according to claims 1 to 5, in which a cast-iron box containing a heat-insulating material is provided between the oven door structure and the bottom-less gas migration and isolation hollow plug.
7. ~A coke oven door to promote temperature rise in the vicinity thereof according to claims 1 to 6, in which one or more vertical nozzle pipes are separately provided in the bottom-less gas migration and isolation hollow plug, each of said vertical nozzle pipes comprising a gas nozzle in the upper part, a coal dust chute in the lower part, a combustion gas supply pipe communicating with a combustion gas supply source provided therebetween,.
8. ~A coke oven door to promote temperature rise in the vicinity thereof according to claims 1 to 6, in which one or more combustion gas injection nozzles are separately provided in the bottom-less gas migration and isolation hollow plug, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation hollow plug at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, a cylinder fastened to the uppermost point of said combustion gas nozzle pipe, said downward opening shutter movably connected via a movable connecting rod to a rod connected to the coke oven side of a piston reciprocating in said cylinder, and a gas flow pipe connecting the combustion gas pipe nozzle between said nozzle and downward opening shutter and the oven door side of said cylinder.
9. ~A coke oven door to promote temperature rise in the vicinity thereof according to claims 1 to 6, in which one or more combustion gas nozzle pipes are separately provided in the bottom-less gas migration and isolation hollow plug, each of said combustion gas injection nozzles comprising a combustion gas nozzle pipe having in the gas flow passage thereof a nozzle directed toward the bottom-less gas migration and isolation hollow plug at one end thereof and a downward opening shutter adapted to close a gas passage in the combustion gas supply pipe connected to a combustion gas supply source at the other, an ovally shaped annular member whose upper end tilts toward a combustion gas supply source and lower end toward the nozzle, and a downward opening shutter closing an opening in said annular member from the side of the nozzle.
10. A coke oven door to promote temperature rise in the vicinity thereof according to claims 8 and 9, in which a tar reservoir communicating with the combustion gas passage at one end and having a closing lid at the other is provided below one or more combustion gas supply pipe or combustion gas nozzle pipe separated provided in the bottom-less gas migration and isolation hollow plug.
Applications Claiming Priority (17)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002210272A JP3937156B2 (en) | 2002-06-13 | 2002-06-13 | Coke oven lid for promoting temperature rise near the coke carbonization oven lid |
| JP2002-210272 | 2002-06-13 | ||
| JP2002214562A JP3887748B2 (en) | 2002-06-18 | 2002-06-18 | Coke oven lid for promoting temperature rise near the coke carbonization oven lid |
| JP2002-214562 | 2002-06-18 | ||
| JP2002224184A JP3985149B2 (en) | 2002-06-26 | 2002-06-26 | Easy to repair coke carbonization furnace lid |
| JP2002-224184 | 2002-06-26 | ||
| JP2002239911A JP2004051929A (en) | 2002-07-16 | 2002-07-16 | Coal carbonization oven cover of coke oven |
| JP2002-239911 | 2002-07-16 | ||
| JP2002-267396 | 2002-08-09 | ||
| JP2002267396A JP2004075965A (en) | 2002-08-09 | 2002-08-09 | Coke oven cover heating oven cover side of coke carbonization oven |
| JP2002-294244 | 2002-08-29 | ||
| JP2002294244A JP4106542B2 (en) | 2002-08-29 | 2002-08-29 | Coke oven lid with easy-to-repair gas generated in the furnace |
| JP2002-307672 | 2002-09-12 | ||
| JP2002307672A JP2004099859A (en) | 2002-09-12 | 2002-09-12 | Heating lid of coke carbonization furnace |
| JP2002-353107 | 2002-10-29 | ||
| JP2002353107A JP3985154B2 (en) | 2002-10-29 | 2002-10-29 | Coke carbonization furnace temperature rise furnace lid |
| PCT/JP2003/007480 WO2004007639A1 (en) | 2002-06-13 | 2003-06-12 | Coke carbonization furnace cover for promoting increase in temperature of coal particles near the cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2489081A1 true CA2489081A1 (en) | 2004-01-22 |
Family
ID=34280280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002489081A Abandoned CA2489081A1 (en) | 2002-06-13 | 2003-06-12 | Coke oven doors for promoting temperature increase in the vicinity thereof |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1533357A1 (en) |
| KR (1) | KR100649069B1 (en) |
| CN (1) | CN100352891C (en) |
| CA (1) | CA2489081A1 (en) |
| PL (1) | PL373157A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103540326A (en) * | 2013-10-31 | 2014-01-29 | 袁国炳 | Seal and insulation of temperature measuring small furnace lid of vertical flame path of coke oven |
| CN114736694A (en) * | 2021-03-31 | 2022-07-12 | 山东优肯诺节能科技有限公司 | Coke oven carbon reduction and coke prevention method and system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54134701A (en) * | 1978-04-11 | 1979-10-19 | Nippon Steel Corp | Suspension of operation of coke oven without cooling |
| JPS6212159A (en) * | 1985-07-09 | 1987-01-21 | Matsushita Electric Ind Co Ltd | Photoelectric conversion device |
| JPS63112686A (en) * | 1986-10-29 | 1988-05-17 | Sumitomo Metal Ind Ltd | Method of promoting carbonization in oven mouth portion of coke oven |
| JPH0818644A (en) * | 1994-06-29 | 1996-01-19 | Yasumasa Nozaki | Telephone call originating equipment by card |
| JPH0826649A (en) * | 1994-07-08 | 1996-01-30 | Mitsubishi Denki Bill Techno Service Kk | Safety fence installation |
| ES2219439T3 (en) * | 1999-10-26 | 2004-12-01 | Deutsche Montan Technologie Gmbh | COCK OVEN DOOR WITH GAS CHANNEL. |
-
2003
- 2003-06-12 CN CNB038137569A patent/CN100352891C/en not_active Expired - Fee Related
- 2003-06-12 EP EP03764117A patent/EP1533357A1/en not_active Withdrawn
- 2003-06-12 KR KR1020047020123A patent/KR100649069B1/en not_active IP Right Cessation
- 2003-06-12 PL PL03373157A patent/PL373157A1/en unknown
- 2003-06-12 CA CA002489081A patent/CA2489081A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| CN100352891C (en) | 2007-12-05 |
| EP1533357A1 (en) | 2005-05-25 |
| KR100649069B1 (en) | 2006-11-27 |
| PL373157A1 (en) | 2005-08-22 |
| KR20050117477A (en) | 2005-12-14 |
| CN1659255A (en) | 2005-08-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |