Page 33 - konishipaper

the~ ~herma1~emisßion nfro同
.
.the、 S1.ag s山 fa:ce，ty t)i:e p~t 訂 izaci0411)h
s.i.um，"，:calci，um:an，d iro.c".~peG.ies tqe'work，fun.ction;，f.Qr.t，heIe1~c;t
a l . ( 1 2 ) . .e1ectrode'temper，B:ture，lwas.Tigher，:than t.h~ . vaporiz8:t;ion
suggestedby-':):akano(13).，" !'; r. 、}
temp~rature
•• "、 • "・
the'sμg s口r~ase ， .~o~ev~r ;by 叫le:¥d巳creas昇;/o.f::.p
‘
from
'
emi.ss工on of.，the
increases and!thξ as.i+¥，Ca47+apdd:;.EF、eれ?7T;
The. d~st~iÞùtiRns~of~e1e~号n~~.: .aC;，r，qs~ ~he:ミ]てag ，~~y~r!.~qn:中e 何仁hO~己:(a~.~~;r:， 仁り巳 fivemi~u~es rarcing' 4i~ch~rg号I.~r:.~.， shC>wn-:.'in.;.F，~g"l'4~. In仁his，analysis，'th，~
，
ro.n
.
s
，
~ag
，.'the.io~s
movet~. the.elec仁r.ode.S.llτfaceβn，d!th~! co.ntac仁Bpf，夫h~: ミ1.ag.\r.:'~村耳h，仁)h己i.:己l己ct雪守dR
bn.thピlother would be.ir甲rlpro下;ve~ an.di，the 巳~\~叫，r吋白τ芹entιtí
バ「
hand
currentmight
;
decr~as~.
(J
.
su
'
c~ I
specimeI;l 'was'pr，epared(by":separa仁工 ng ~he :) slagj.layer.fr~m ，、 th，e
cross、 section:of.•the.，layer.i'~nd ‘ 仁he"
e~ectrode
and.'tqe analyz~d
surface ~ere
the 己l~D;le.n.ts.occ)-l;r.neari、the electrode.aS
e~ectrode
ミ巳para~ely
by:.an.XMA.γThe
o u t b y C a d o f f e 仁
sodium being，:remarkable，..bu;t"pqtass，ium ~xcep.t. ，
the.c1ear.sign0fseg1:".egati0n. o.'ne0fthe.reas0n~ cQ.u~dbe~0nsideredast~e
F i g . a4 s h o w s t h e S e g r e g a st i o n s q f i r o n ， q K 1 .日 m h a 月口 10:.;% K2S04、added:.，d.o~，~. no~.;igive
of po.tas.sium metals.nd..the.condensationof.pO，tass~um :could.nOC，occur!，・near仁heel~Stro~e a.s
.
seg~eg~t
.
~on of
，
.
P9~nte~
(2') Anode
F i g . 5 s h o w s t h e c u r - t : A n d a n - - e : d r o p a f t e f t h e ナ s t e ? i J i s e - b p i c - - i 以 ム !f
100 V. The current decreases and the anode drop increases just after the application of potential. This behavior.shows:the~ncr~aae ! o~ the tes~stivity of slag layer by the current conduction. The main reason・Jcou，ld・I be'l:considered
as the:production of the resistive 1ayer near the anode by~he i τeac'tions'related"withtheぅ主叫onsi.'such‘as.，0プ.~1'and，S04~': ソTh~se 'anionsg~nerate
'gas.arid thel"po'or 'contact'¥'.of;'the、 s1ag'，with;the.'e1ectrodei occurs.apd .the res1stance'increases'.fiThe~ pτoducedga.s、st.irs，the:mo1-renrslag1ayer.a~d le.ts the distributioris‘ of slage1ement be'homogeneous.γ・Chromium was observed，on‘the sla'g suてface;in'the'.case'，-'of.F.e203.aclded"slag) which.certifiectthe.;，:pccurrence ~f
.:2~2.3 'ArcingPhenomena;r.~ (1)''.'Cathbder.'，・
The ar.c spots on the cathode alwaysl'sta'rt.'a仁・the upstream part.・of.the e1ectrodeandmovetodownstream. ，Thenewarcspotsstartagainattheup- stream when the old ones are gone. When the current is increased，'.;the numbers ofarcspots'increase':and.by・1furtherincrease!ofcuirent;.仁hefinear~ :discha;- ging moves tothe'big arc one¥and :.the' 'slag'la'yer .0I1， 'the.~tectrode .is 'dispersetl.
:Fig.. .6(a) sh0 W s the'behavi.ors.0-f't.he、arcingi;discharge'o'n the;fly'ash;slag.
the!.'sep'arat工on'oξ'chro皿土um.fr.om， rth~
th.e t.ransportation;"to':the slag surface・by~the .mixing..'1 ‘1・
!re~p
'
ectivëly
!，.J
、 ou1diclassifiedinto:two.'typical，transition'modes'bf.arcin
1 ・:rTh己se.'hehavi6rs
;and
sooo."the'numbersldecreased'to one:1wit，T;keeping the
に
diameter. withke~ping ，ヒhe
'whenth、e'l'app1ied‘ 'keeping-守'Jthe:.'シ'nu1日mberunchanged;'~econd1y;
voltä.ge
a'node!by".the.'e1ectrochemicalir巳action and 人・:， iぃ、: 山
工nitial1y 'jthe'existing-two the diamete工 O壬・1;4.1・mm:detreas~d the1number from two.to、・one:.and the1;cathode'drop;'increased'.'dJWhen.:{the'appFied'vo1tage was
.the:number.of'arcs!increasesヒ・ o'tw0 and"a1's.o the'diameter 0f arc in己主eased'to)2~0' '，'mm.，.After.a'while.the.curren.t;!decreased:.and'.'a1so.the.number did..¥.Thei.numb~r': and'.'the<di:ameter'of.arcs:.increa.sed.~ tothree'."ari:d，2.3、町田
， ~arcs'. of..
inc~eased
'respective1y'<.?-ft'er.theミ app1ied.l. .-yo1tage' was・ 、 furth~r :.' increased ;
arcs a1so decreases as、the current.wa's"conducted.ι';i ':"1('; (1j:j ). 1 円 併
Fig. 6(b) shows the a:cc beh:aviors for Fe2?3. added sla.g.~'，
started by an arc'of the dia.meter of 1.8 mm an-d エヒ continued:for:a:while:until
it decreased t0 1.4 mm. The diameter in.creased t0 2.6 mm by inc，reasing¥the 'applied :vz'lta旨e，、but.again・it:'decreasedIto・2.0.mm.'.¥:J.By:.cJincreasing".the':)applied '.V01tage[~further.;.、the'number.s:;and;.'the.diameter.i'ncreased，t0 .two!a'nd-1-2.5'.mm
土Slγin己reased一~.'.い.‘ F、工:rst1y， the:number!~ntreases
.1650
e1ectrochemical
:The:;r'iumber:;of d ぺ!I'・"，:~'.:
The .d~~schar~~
.
~
.
~a~マ
、“，、16 ‘
，.J -f
1
1
f
，
，