D) Black Liquor Recovery Boiler - YOKOGAWA ZR22G Technical Information

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d) 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 combus-

tion in the combustion facility (boiler). Since the exhaust gas includes large amounts of dust

(hydrated sodium sulfate) and water vapor, a detector with filter is selected.

Economizer: Outlet

(economizer, feedwater

preheater)

Sample point

System type

L2, L3

(detector with filter)

4. Applications

Detector

Objective

D3, (D4)

Combustion monitoring

Black liquor recovery boiler

Gas temperature: 170 to 200°C

Gas pressure: +2 kPa

Dust: 6 to 15 g/Nm

Main dust components: Na

TI 11M12A01-01E

4-4

T0451.EPS

90%

10%

F0451.EPS

May 31,2004-00

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