<8. Detailed Data Setting>
8-21
IM 11M12G01-02EN 1sh Edition : Mar. 25, 2021-00
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 x (Hl/10000) – 1.36 (m /kg)
Low calorific power = Hl
X value = (3.37 / 10000) x Hx – 2.55 (m /kg)
where, Hl: low calorific power of fuel
h: Hydrogen in fuel (weight percentage)
w: Moisture content in fuel (weight percentage)
Hx: Same as numeric value of Hl
For gas fuel
Amount of water vapor in exhaust gas (Gw) = (1/100) {(h2) + 1/2 ∑y (Cx Hy) + wv} (m /m )
Theoretical amount of air (Ao) = 11.2 x (Hl/10000) (m /m )
Low calorific power = Hl
X value = (1.05 / 10000) x Hx (m /m )
where, Hl: low calorific power of fuel
CxHy: Each hydrocarbon in fuel (volume percentage)
h2: Hydrogen in fuel (volume percentage)
wv: Moisture content in fuel (volume percentage)
Hx: Same as numeric value of Hl
For solid fuel
Amount of water vapor in exhaust gas (Gw) = (1/100) {1.24 (9h + w)} (m /kg)
Theoretical amount of air (Ao) = 1.01 x (Hl / 1000) + 0.56 (m /kg)
Low calorific power = Hl = Hh – 25 (9h + w) (kJ/kg)
X value = 1.11 - (0.106 / 1000 ) x Hx (m /m )
where, w: Total moisture content in use (weight percentage)
h: Hydrogen content (weight percentage)
The average hydrogen content of coal mined in Japan, which is a dry ash-free type, is
5.7 percent. Accordingly, "h" may be expressed mathematically by:
h = 5.7 [{100 – (w + a)} / 100] x (100 – w) / (100 – w1)
where, a: Ash content (%)
w1: Moisture content (%), analyzed on a constant humidity basis
Hh: Higher calorific power of fuel (kJ/kg)
Hl: Low calorific power of fuel (kJ/kg)
Hx: Same numeric value of Hl
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Figure 8.14 Calculation Formula
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