1. a) Weak Black liquor (WBL) during recovery process must be heated with a heat exchanger (evaporator type) through which fresh steam supplied. The exit temperature of the Black Liquor is controlled by adjusting the rate of flow of steam through the heat exchanger with the pneumatic control valve. A process reaction curve test was performed in
the 1950s and are well proven in black liquor service. The design consists of a heat exchanger and a vapor/liquor flash chamber connected to each other through a recirculation loop. Liquor is heated in the heating element that is back-pressured to prevent boiling within the tubes. Boiling and evaporation occurs away from the heat transfer Data Analytics Methodology for Construction of degradation is an evolution of fouling in a black liquor heat exchanger. 1. I NTRODUCTION In the last decade, data-driven prognostics and health man-agement (PHM) of industrial systems have shown signicant advances for building predictive maintenance strategies and offer promising perspectives for high reliability, availability,
The black liquor is fed in the evaporator and is pumped to the top of the heat exchanger tubes together with the liquor which is recirculated. The distribution The degradation further continues THE EFFECTS OF FLOW VELOCITY ON CRYSTALLIZATION FILM BLACK LIQUOR EVAPORATORS M. Gourdon Energy and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden. [email protected] ABSTRACT In pulp mills, fouling can be a significant problem in the so-called black liquor evaporation plant. This is a multistage evaporation plant that actually works as a
Process for treatment of black liquors from kraft pulp mills wherein black liquor is heated,in the absence of added free oxygen,under pressure at a temperature in the range of 450 to 700* F.for a period of 0.5 minutes to 6 hours to form a solid granular coke product which is separated from the resulting liquid to yield an aqueous liquid effluent suitable for reuse in the pulp making process.
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