Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual
Page 135
IM 11M13A01-02E
8-18
Fill in the boxes with fuel parameters in Equation 2 above to calculate the moisture
content. Use A0, Gw and X shown in Table 8.8. If there are no appropriate fuel data in
Table 8.8, use the following equations for calculation. Find the value of “Z” in Equa-
tions 1 and 2 using Japanese Standard JIS B 8222. If a precise measurement is not
required, obtain the value of “Z” using a graph Figure 8.17 for the absolute humidity
indicated by a dry and wet bulb hygrometer.
For liquid fuel
Amount of water vapor in exhaust gas (Gw) = (1/100) {1.24 (9h + w)} [m /kg]
Theoretical amount of air (Ao) = {(12.38 / 10000) x H1}
Ϫ
1.36 [m /kg]
Low calorific power = H1
X value = {(3.37 / 10000) x Hx}
Ϫ
2.55 [m
3
/kg]
where,
H1: low calorific power of fuel
h: Hydrogen in fuel (weight %)
w: Moisture content in fuel (weight %)
Hx: Same as numeric value of H1
For gaseous fuel
Amount of water vapor in exhaust gas = (1/100) {(h2) + 1/2
⌺
y (Cy hy) + w} [m /m ]
Theoretical amount of air = 11.2 x (H1/10000) [m /m ]
Low calorific power = H1
X value = (1.05 / 10000) x Hx [m /m ]
where,
H1: low calorific power of fuel
h: Hydrogen in fuel (weight %)
w: Moisture content in fuel (weight %)
Hx: Same as numeric value of H1
For solid fuel
Amount of water vapor in exhaust gas (Gw) = (1/100) {1.24 (9h + w)} [m /kg]
Theoretical amount of air = {(1.01 x (H1 / 1000)} + 0.56 [m /kg]
Low calorific power = H1 = Hh
Ϫ
25 (9h + w) [kJ/kg]
X value = 1.11 - (0.106 / 1000 ) x Hx [m /m ]
where,
w: Total moisture content in use (weight %)
h: Hydrogen content (weight %)
The average hydrogen content of coal mined in Japan, which is a dry ash-free type, is
5.7 %. Accordingly, "h" may be expressed mathematically by:
h = 5.7 [{100
Ϫ
(w + a)} / 100] x (100
Ϫ
w) / (100
Ϫ
w1)
where, a: Ash content [%]
w1: Moisture content [%], analyzed on a constant humidity basis
Hh: Higher calorific power of fuel [kJ/kg]
H1: Low calorific power of fuel [kJ/kg]
Hx: Same numeric value of H1
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