OCR Text |
Show lines for coabustlon. The produced gas was detected Fourier transfer infrared ray spectorometry (FT-IR), obtainable for a second. by the 18 data The method of the test is that the CO, Air (lie) eFT-In) emission due to the reaction of rapidly heated sample on the probe was detected by FT-IR to calculate the combustion rate. In this paper, the combustibiiity of coal was estimated as the maxi-mum combustion rate coefficient ([Ks]max.) defined as the maximum combustion rate (CO, ~-+. .~. ------ samPl~e I SOUJ'ce lmg ••• 1/. Mj rro~,·· Oetector '~~~-wm~-' '='-' 3 .:. ~ Trnlp. Control Tal' Trap Fig.2 A pparatus for Combustion Rate production rate) calculated from the following formula (1). [ K s ] .. a x • '= (d [C 0 '- ] I d t) II a x. / ( s . P 0 2 ) .................. (1 ) (d[C0 7]/dt)max.: maximum CO2 production rate (g/s'g-sample) S specific surface area of the sample (cm2/g-sample) P02 O2 partial pressure (at.) Figure 3 shows the maxiMum combustion rate coefficients of the coals at 1400~ heat temperature. Figure 3a shows [Ks)max. vs. FR "hil~ Figure 3b sho"s [Ks)lIax. vs. Ole (the .olar ratio of oxygen to carbon in original coal). Froll these figures, the combustion rates of the coals used in this ~est were found to be in the same range measured for other bituminous coals by this DIe thode E +J co B.O i 7.0 en ~ 6.0 ~ 5.0 ~ ~ 4.0 00 Coal ~~.~ n j bunj nous ~ CO" I 1. 0 1. 5 2.0 2.5 3.0 Fuel Hatio. FR (-) (a ) B.O i~ 7.0 en ~ 6.0 D _0 ~ -.- ~ 5.0 FR::2--3 ""c.-~-- ~ ;p;r;-.,.; 4.0 Oo- --0.-05~ -0-.1~0 -0-.1~5- -0~.20- -0~.2 5 Ole (molar ratio) ( b ) Fig.3 M axiliuDl C o.bustion Rate Coefficients of C oa1s -3- |