the coking properties of coal at elevated pressures. - Argonne ...

\
- + 1)
x. =
1
bL/n
YO
Defining dimensionless parameters X = 3 and Y = then from equation
22) we get X. X.
JI(Xi'X) =
where a = [ (+ +1d
na3-l exp (-ax")
exp(-aXln) -exp(-aXZn)
Substitution of @(x.,x) from equation 24) into equation 11) and making other
appropriate terms dimensionless gives
where
F (x X,Y) =
2 i'
N = exp(-aXln) - exp(-ax n, and Z = 2
2
X.
The lower limit of integration in equation 25) is given by
Z = X ifY,cX
1
1
and
2 = Y ifY>X1
Similarly equation 20) for the burn-out time, becomes
t =
mi (l-mhi) w(xi - 2Y 2 ) sp(Xiy)
128Cokl +-
+ F(Uo)Co 64C0 k2
and equation 15), the particulate phase oxygen concentration, becomes
1
P F(Uo) np
where
= co[ I -
i
x2 -
192klmi fF3(xi ,X,Y) d
2
299
2 7)