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Wednesday, February 4, 2015

Kraft Pulp and Paper Mills

Plate or tube-type ESPs are used in the kraft pulp and paper industry to reduce particulate
emissions from the recovery furnace. In the kraft process of making pulp and paper, chemicals
are recovered by using evaporators, recovery furnaces, and reaction tanks. As part of the pulping
process, a waste product, black-liquor, is produced. After it is concentrated, the blackliquor
concentrate is burned in the recovery furnace to provide heat and steam to various processes
in the plant. The recovery furnace is essentially a boiler designed to effectively burn the
black-liquor concentrate. The resulting flue gas contains particulate matter that is usually
removed by an ESP before it is exhausted into the atmosphere. Dust can be removed from collection
electrodes by rapping or by using water sprays.

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