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– 47 –
(1) NO
x
after O
2
correction
CO after O
2
correction
(a) Calculating equation
21 - On
C=
• Cs
21 - O
S
C: Concentration after O
2
conversion
Cs: NOX or CO concentration measured
Os: O
2
concentration measured
On: O
2
concentration as conversion basic:
4% Oil combustion boiler
5% Gas combustion boiler
6% Solid object combustion boiler, petroleum heating furnace
12% Garbage incinerator
(b) Block diagram
Zurconia
type O
2
sensor
O
2
converter
O
2
signal
Infrared gas analyzer
Full scale is the same as
instantaneous value before
conversion.
O
2
/NO
x
conversion
or CO (ppm)
NO
x
or
CO signal
21 - On
21 - Os
· Cs
(2) Moving average output
1 hr. moving average output (for NO
x
, SO
2
)
4 hr. moving average output (for CO)