Page 31 - konishipaper

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ト¥
ARC BEHAV10R OFCOAL SLAGGED ELECTRODES KAZUTOMO OHTAKE，TADASH1 KON工SH1 and K.ATSUH工KO;ARAYA
、
.、
、
1・I~\ ，1" ゾ1 、‘'
AbstI"a'ι
，
・‘ 町三
t h e experiments
conduction through the slag 1ayer covering over !:he :
e1ectrod~s
inevitab1e. 1~
this s~~se ，与 he
JM¥.
oretiω 。ーω ω c u - A te皿perature.adjustab1e meta1"e1ectrode
山 simp1e 恥
in order to study the arc behaviors of coa1
1ations are.， carried， ，~u.t
slagging e~eçtrodes.
covered by the. pool~d
e1ectric potent~、al
across the combusヒi~n
t h e ， s 1 a g t 0 's t u d y t h e e f f e c t:. 0 f t h e s e m a t e r 工 a 1 s o n ヒ h e d i ，s c h a r g e
phenomena and e1ectro-chemica1 reactions with e'lectrodes ~
gation of m宇仁 a1 e1ements，:'by
study the segre ，trochemica1γreactions.，The ~~τrent
area was!'obtained. A si叫 1e arc dischaFge :mo~e~ cons~dering the 日 e n e r g y 、 b 'a 1 a n c 'e"s ¥' a '仁 b o t h ' p l a s m a a n d :， 's l a g s i d e s 'w a 's' d e v e 1 0 p e d ヒ 0 . .， discuss the experimenta1 resu1ts・
、e
1. 1ntroduc'tion'I): ~， i:.l"(引; 1)(i':'(
工n the， practica1 coal fired MHD generator，ヒ he arc dエscharge and curren仁
，
，
po1arizat 工~n
wou1d，not，be fωdamenta1 study'on the‘currerit discharge and th'e arcingbehavior through and on the coal slag 1ayer becomes important to eV，a1uatetheperfor中anceofgeneFaEor.Rosa(l)arrangeS 仁hearcingdataever
and tr~es
c h 'a r a c t e r i s t i c s 'o f a r c ， ，'"s p o t s d i f f e r b y t h e s c a 1 e s o f g e n e r a t o r ・ T h e a r c i n g behaviors are so c6mp1icated and the fu11 understanding of the phenomena
in the previous work(2，3，.)"jbut， suitab1e for the fundamenta1 study，consists of th己Slag pool coverLPg overthe t己mperature，adjustab1e meta1 e1e~trodes. The sl'ag is not rene'wed'and kept'as it was set at ヒhe star仁 of exper工皿 ent. K2S04 was added to'simu1ate th己 slag 1ayer contεining potass工um component by
re~orted
to corre1at~
ヲ ith
his the9ry， and points out that the
j¥
st'il1 rem'ains.、
，The slaglayer 'adopted'in this ;report is more artificia1 compared with those
ab~orbíng
the seed materia1s. ''Fe203 was a1so， added to simu1ate to change the
Taェheiyo .;ccfa1 s1ag is¥used. The
and m~lt. ed
I-S applJLeO1beEweenEhis andpairedelec仁rodes
gas p~asma
f1ow~
K2~04; .Fe203 are ~added to
"After the experiments， the s1!1g :was s1工 ced and.analyzed by an'XMA to
Th~ curτent，( density defined by the arc area is obtained.
，1n order to exp1ain，ヒt'e，experimenta1 resu1ts， a simp1e arc mode1 is deve1-
sorts of coa1.
oped. There‘ have been reported ~any
of t'lI'e transition from ヒhe，homogeneous to the arcing discharge(4，5，6，7). The arcm0de1safterthe'arcs，tartedarescarce. Dickseta1.(8)predicted仁he cathode drop from"the energy ba1ances across a cathode arc・ Sadovnik(9)
and'e1.ec- density defined by the arc ~P9t
studies treating the critica1 condiヒJ.ons
a士c on a slagging e1ectrode. Most T h i s '" m 泊 e 1 ・ ; c o h s t d e t s fi b o t h li g i s a n d S l a g p h a s e s t O o b t a i n t h e c u r e M a n d
cathode'，γo1'tag守'd???SLby， calculati時 ヒ he energy ba1ance of 七he arc structures. 2. Eχperi白一町
ca1cu1ated the cathode
ofth包ピeportedi，a'rc
、
drop り m，ode
，'
did no・ビJ 包1ways 'c'oup，le:，'both:.{!，) .:':¥F
2.1Apa'r'a'f:山u与仁三υf汁 ， 'It: d
υ1川，汀f ¥1::
，~ ing th~
m.'odeTs，iti'e1ate'd;on1y the gas 0r the s1ag phase phenomena，
:!(吋山 ハ、
F土g:'11's五owsio!'thre schema:i!iとs":of the aciop仁ed e1ectrodes.
loZkjSoh，|叫， 5
The origina1，5 and addedイomesticTa'iheiy0c0a1s1agweretested. The
S1ag'was'
;
~ '.F e
'
~03
'，
prepared :in-tl1'e
，
Toyohashi University of Technology，Tempaku-cho，Toyohashi，440 Japan. 。48
I'
i
0
e:1e己tric furnace at 1350 C for 5 hours to form 仁he