Comments on: SO2 emission dependency on recovery boiler operation

By: Roxare

Roxare — Thu, 23 Jul 2009 14:41:57 +0000

Sulfur emission from the recovery boiler is a function of temperature, the added air and the liquor’s dissolved solids content. Old boilers processing high sulfidity liquors at low dry solids, and with insufficient air systems, have a higher SO2 emission rate.

The liquor S/Na ratio and the burning intensity (% solids and boiler loading), combined with efficient mixing in the air system, are the key factors in controlling the SO2 emission. To reduce emission, high dry solids firing and a modern air system is required. High dry solids firing increases the bed temperature, resulting in increased emission of alkali metal vapor (Na) and a reduced ratio of S/Na.

By: SURES JENA

SURES JENA — Wed, 22 Jul 2009 02:54:02 +0000

Suggestion for old boilers to reduce the ratio.

By: Roxare

Roxare — Fri, 06 Mar 2009 13:33:40 +0000

The ratio is a mole %, analyzed on as-fired black liquor. It is mole S divided by the sum of (mole Na+mole K)

By: Jaco Olivier

Jaco Olivier — Fri, 06 Mar 2009 04:19:32 +0000

Would you please tell me how to interpret the ratio referred to in this article? Is it S/(2*K+2*Na) or S/(0.5*K(total)+0.5*Na(total))?

Regards
Jaco