A study of liquor side fouling in sulfite spent liquor evaporators Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cf95jh00r

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  • The effects of possible operating variables such as flow rate, surface temperature, bulk temperature, solids contents, sulfate addition and pH on the fouling of sulfite spent evaporators were studied. The study pointed out that the Ca⁺⁺ concentration difference between heated surface and bulk is the most important factor for fouling rate. The fouling rate is proportional to the concentration difference. The fouling rate per Ca driving force is also strongly affected by flow rate and is controlled by mass transfer and shear stress. The effect of mass transfer and shear stress on fouling rate in terms of velocity and concentration driving force was modelled as in the following equation. d(l/U)/dt = 3.8705E-2 * V0-33 * (Cb-Csat) for laminar flow d(l/U)/dt = 4.043E-2 * V0*8 * (Cb-Csat) - 4.793E-2 * V² * (Cb-Csat)1*07 for turbulent flow respectively. Increase of sulfate concentration in red liquor tended to reduce the fouling.
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  • File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-05-31T20:15:47Z (GMT) No. of bitstreams: 1 YoonWoonYoung1989.pdf: 2264741 bytes, checksum: 3292ee4edaab0adca702d8682a7d34dd (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-23T20:57:09Z (GMT) No. of bitstreams: 1 YoonWoonYoung1989.pdf: 2264741 bytes, checksum: 3292ee4edaab0adca702d8682a7d34dd (MD5)
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