D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
10/37, 9/36.9
D21C 11/12 (2006.01) B01D 1/26 (2006.01) B01D 1/28 (2006.01) D21C 1/02 (2006.01)
Patent
CA 1097465
ABSTRACT OF THE DISCLOSURE The net energy used for digestion of wood chips compared to the prior art is reduced, and in fact a net energy gain from the digestion process can be provided by proper black liquor heat recovery. Black liquor is with- drawn from the digester and the solids concentration of the withdrawn black liquor is increased to at least about 60% while steam is generated having a minimum temperature at or higher than the temperature necessary to treat chips in the digester system. Essentially all of the generated steam is recovered and utilized for treatment of chips in the digester system so that the chips are the final condenser for the steam and so that no condensing of the steam with water is necessary. The waste heat that normally would be disposed of in the condenser water is utilized to preheat chips before or during digestion. The concentrated black liquor is then burned to generate heat, and the heat generated by the burning is utilized further in the digester system for chip treat- ment, resulting in a net energy gain from digestion.
272239
Goudreau Gage & Associates
Kamyr Inc.
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