Teledyne Deltaflow DF180, Руководство по эксплуатации и обслуживанию, Страница: 15 / 42

January, 2018
Page 15
Where:
V
s
= stack gas velocity, m/sec (ft/sec).
C
p
= Type S pitot tube coefficient, dimensionless, Default 0.84.
ΔP = Velocity head measured by the Pitot tube, Pa (in. H
2
O.)
T
s
= Stack temperature, °C (°F).
P
s
= Absolute stack pressure, mm Hg (in. Hg)
M
s
= Molecular weight of stack gas, wet basis, g/g-mole (lb/lb-mole).
Molecular weight is calculated based on Equation 2.3
Eq 2.3
𝑀𝑀
𝑠𝑠
= 44 𝑥𝑥
% 𝐶𝐶𝐶𝐶2
100
+ 32 𝑥𝑥
% 𝐶𝐶2
100
+ 18 𝑥𝑥
% 𝑊𝑊
100
+ 28 𝑥𝑥
( 100− % 𝐶𝐶𝐶𝐶2− % 𝐶𝐶2− % 𝑊𝑊 )
100
Where:
%W = Percent by volume of water vapor in the gas stream, %
%O
2
= Percent by volume of oxygen in the gas stream, %
%CO
2
= Percent by volume of carbon dioxide in the gas stream, %
After velocity has been calculated, volumetric flow rate can be calculated based on Equation 2.4.
Eq 2.4
𝑄𝑄
𝑠𝑠
= 𝑉𝑉
𝑠𝑠
𝑥𝑥 𝐴𝐴
𝑠𝑠
𝑥𝑥 3600
Where:
A = Cross-sectional area of stack, m
2
(ft
2
).
Q
Act
= Volumetric stack gas flow rate, m 3 /hr (ft 3 /hr).
To adjust the stack volumetric flow to a standard temperature and pressure, use Equation 2.5.
Eq 2.5
𝑄𝑄
𝑠𝑠𝑠𝑠𝑠𝑠
= 𝑄𝑄
𝑠𝑠
�
𝑇𝑇
𝑠𝑠𝑠𝑠𝑠𝑠
𝑇𝑇
𝑠𝑠
� �
𝑃𝑃
𝑠𝑠
𝑃𝑃
𝑠𝑠𝑠𝑠𝑠𝑠
�
Q
std
= Volumetric stack gas flow rate corrected to standard conditions, scm/hr (scf/hr).
P
std
= Standard absolute pressure, default 760 mm Hg (29.92 in. Hg).
T
std
= Standard absolute temperature, default 20 °C (68 °F).