<4. Applications>
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TI 11M12A01-01EAll Right Reserved Copyright © 2004, Yokogawa Electric Corporation
Mar. 14, 2017-00
(4) Black liquor recovery boiler
The spent liquor in a pulp production process is commonly referred to as “black liquor”. The
sodium carbonate and sulfate components in this black liquor are recovered by burning it
and using the heat to generate steam. The oxygen analyzer is used to monitor or control the
combustion in the combustion facility (boiler). Since the exhaust gas includes large amounts of
dust(hydratedsodiumsulfate)andwatervapor,adetectorwithlterisselected.
Sample point System type Detector Objective
Economizer outlet
(economizer, feedwater
preheater)
L2, L3
(detectorwithlter)
D3, (D4) Combustion monitoring
F0404.ai
Black liquor recovery boiler
Gas temperature: 170 to 200°C
Gas pressure: +2 kPa
Dust: 6 to 15 g/Nm
3
Main dust components: Na
2
SO
4
≦
90%
Na
2
CO
3
≧
10%
Steam
Economizer
Water Supply
To EP
AH
Ash
Secondary Air
Primary Air
Primary SH,
High-temperature
Primary SH,
Low-temperature
Secondary SH
Tertiary SH
Exhaust Gas
Steam
Drum
Auxiliary Heating Burners
2 units at Furnace Front
Secondary Air
Black Liquor Nozzles
Tertiary Air
Primary Air
Starter Burners
(4 units left and right)
Water
Drum
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