UFC 3 -430-11
14 February 2001
Figure 7-6.
Typical Cross-Limited (Lead-Lag) Boiler Control System for a Single Fuel
Using Full Metering with Oxygen Trim
STEAM FROM BOILER
OXYGEN
ANALYZER
O2T
PT
FT
FROM
PLANT
MASTER
SP
O 2IC
PIC
FY
SP
FY
A
BOILER
A
f(x)
M
M
MASTER
AIR/FUEL
O2Y
FY
FY
RATIO
f(x)
SP
SP
FY
FIC
FIC
FY
A
A
X
M
M
FY
FY
FY
FY
I
I
P
P
FT
FE
FV
FT
FUEL TO BURNER(S)
COMBUSTION AIR
TO BURNER(S)
FORCED DRAFT FAN
SYMBOLS PER ANSI/ISA-S5.1
7-7
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