Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

HEAT TRANSFER AND HEAT TRANSFER FOULING IN KRAFT PULPING PROCESSES

Get access (open in a dialog) DOI: 10.1615/IHTC9.1630
pages 455-459

Abstrakt

The present paper reports results of an investigation into the heat transfer and fouling behaviour of NaOH-Na2S liquor used to digest New Zealand pinus radiata. A large number of experiments was performed in a especially designed test loop to measure heat transfer coefficients and fouling rates as a function of heat flux, flow velocity, bulk temperature and solids concentration. As test heaters, an annular section with an heated core was used. The measured heat transfer coefficients were compared to the predictions of correlations for forced convective heat transfer. Fouling of the heat transfer surface was caused by the formation of Burkeite and by the deposition of suspended wood pulp fibers. Both, consistency of deposit and fouling rates compared well with results reported from the pulp mill.