Environmental Engineering Reference
In-Depth Information
s
−1
]
F
l,i
mass flow rate of component
i
in stream
l
[kg
Δ
r
H
j
mol
−1
]
enthalpy of reaction
j
at standard conditions
[J
I
cap
capital investment in a process plant
[$]
I
unið Þ
capital investment for a unit at nominal capacity
[$]
nom
kmol
−1
]
MW
average molecular weight
[kg
n
total number of chemical species in a reacting system [
-
]
n
a
average number of carbon atoms in a set of alkanes
[
-
]
[$ kmol
−1
]
p
i
sales price per amount of component
i
[$ h
−1
]
P
i
hourly earnings from selling of component
i
q
power of the capacity factor in an investment function
[
-
]
r
recycle factor (0
≤
r
<1)
[
-
]
R
ΔH
0
s
−1
]
rate of enthalpy production by all reactions together
[kmol
S
(s)
i
separation factor of species
i
(0 <
S
(s)
i
<1)
[
-
]
year
−1
]
t
prod
production hours per year in a process plant
[h
x
l,i
molar fraction of species
i
in stream
l
[
-
]
X
degree of conversion
[
-
]
α
chain growth probability
[
-
]
β
conversion factor for CO to CO
2
[
-
]
ε
element
efficiency in use of atoms of an element in a process
[
-
]
η
single-pass conversion factor for CO
2
[
-
]
s
−1
]
φ
l,i
molar flow of species
i
in stream
l
[kmol
λ
scaling factor for efficiency of separation technology
[
-
]
Subscripts
a averaged quantity
C carbon related
i
index of a chemical species in a set
j
index of a chemical reaction
k
index for carbon chain length in alkane
l
index for a stream in a block diagram
WGS water
-
gas shift reaction
total
related to the total flow of a stream
4+
index for a lump of alkanes, including C
4
and up
Superscripts
conv
chemical conversion unit in a process
(feed)
relating to feed
mix
mixing unit in a process
(prod)
relating to products
sep
separation unit in a process
(waste)
relating to waste
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