All Rights Reserved. Copyright © 2004, Yokogawa Electric Corporation
TI 11M12A01-01E
4-3
4. Applications
<Toc> <Ind>
c) Pulverized coal boiler
These are almost always large facilities such as power generation boilers; the O
2
analyzer is used
for combustion monitoring and combustion control. Since the exhaust gas entrains a rather large
amount of ash dust, a detector with dust protector will be used.
Sample point
System type
T0403.EPS
Objective
Detector
Economizer outlet
(economizer, feedwater
afterheater)
L2, L3
(detector with probe
protector)
D4
Combustion monitoring
O
2
control
F0403.EPS
Ash
Steam
Boiler Main
Unit
Exhaust
Gas
Drum
Fuel
Superheater
Dust Guard
Horizontal Superheater
Abrasion Due to Dust
Probe Pipe
Probe Protector
Economizer
Air
Heater
Electric
Precipitator
Pulverized coal boiler
Gas temperature: 300 to 400
°
C
Gas pressure: –1.5 to +1.5 kPa
Dust: Approximately 15 g/Nm
3
Fuel: Pulverized coal
Ash
Centrifugal Force
High Density Dust
Dust Flow Direction
: Optimum mounting position
: Second best mounting position
May 31,2004-00
