3 setting fuels – Yokogawa Integral Oxygen Analyzer ZR202 User Manual
Page 104
IM 11M13A01-04E
8-16
8.7.3
Setting Fuels
8.7.3.1Input Parameters
The analyzer calculates the moisture content contained in exhaust gases.
The following sets forth the fuel parameters necessary for calculation and their entries.
The moisture quantity may be mathematically expressed by:
Moisture quantity =
= (Gw + Gw1)/G x 100
=
Ӏ{
Gw + (1.61 x Z x m x Ao
}
/
{
X + Ao x m
}
x 100
where,
Ao : Theoretical amount of air per unit quantity of fuel, m
3
/kg (or m
3
) ...
2
in Table 8.8
G: Actual amount of exhaust gas (including water vapor) per unit quantity of fuel,
m
3
/kg (or m
3
)
Gw : Water vapor contained in exhaust gas per unit quantity of fuel (by hydrogen
and moisture content in fuel), m
3
/kg (or m
3
) ............
1
in Table 8.8
Gw1: Water vapor contained in exhaust gas per unit quantity of fuel (moisture content
in air), m
3
/kg (or m
3
)
Go: Theoretical amount of dry exhaust gas per unit quantity of fuel, m
3
/kg (or m
3
)
m: Air ratio
X : Constant determined depending on low calorific power of fuel ....... 3 in Table 8.8
Z : Absolute humidity of the atmosphere ....... Figure 8.17
(water vapor caused by combustion and water vapor contained in the exhaust gas)
actual exhaust gas(including water vapor) per fuel
+ (water vapor contained in air for combustion)
x 100
Gw + (1.61 x Z x m x Ao)
Go + Gw + [(m - 1) Ao + (1.61 x Z x m x Ao)]
x 100
............ Equation 2
............ Equation 1
Fill in the boxes with fuel parameters in Equation 2 above to calculate the moisture
content. Use A
0
, Gw and X shown in Table 8.16. If there are no appropriate fuel data in
Table 8.16, use the following equations for calculation.
Find the value of “Z” in Equations 1 and 2 using Japanese Standard JIS B 8222. If a
precise measurement is not required, obtain the value of “Z” using a graph for the
absolute humidity indicated by a dry and wet bulb hygrometer.