B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 1/26 (2006.01) B01D 3/06 (2006.01) B01D 5/00 (2006.01) D21C 11/10 (2006.01)
Patent
CA 2059264
2059264 9015652 PCTABS00003 A thermal system includes a plurality of heat exchangers in series and the same number of flash tanks in series is interposed between two subsequent effects of a multiple effect evaporating system for surface black liquor. The liquor is indirectly heated in the heat exchangers by vapor produced by step-by-step expansion of the same liquor in the flash tanks and additionally by steam from an external source. To decrease the viscosity of the black liquor it is heated to a temperature of 190-200·C and retained in a reactor vessel for 10-20 minutes. Preferably the flash tanks and the heat exchange elements are positioned on top of each other within a shell to form an integral construction in which the vapor compartment of each flash tank is directly connected to the vapor compartment of a corresponding one of the heat exchange elements.
Kiiskila Erkki
Ryham Rolf
A. Ahlstrom Corporation
Gowling Lafleur Henderson Llp
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