Modeling the Dynamics of Evaporator Wash Cycles, 2023 PEERS Conference

Kraft pulping is a process that utilizes white liquor, composed of Na₂S and NaOH, for wood delignification and pulp production. This process involves washing the dissolved organics and spent chemicals from the pulp, resulting in the generation of black liquor. Prior to its use as fuel in the recovery boiler, the black liquor is concentrated in multiple-effect evaporators. During the evaporation process, the inorganic salts present in the liquor become supersaturated and undergo crystallization. Fluctuations in liquor chemistry can give rise to severe evaporator scaling events, which significantly impact the thermal efficiency of the evaporators, and ultimately, pulp production.

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