Deposition of sodium sulfate in a heated flow of supercritical water

被引:48
作者
Rogak, SN [1 ]
Teshima, P [1 ]
机构
[1] Univ British Columbia, Dept Mech Engn, Vancouver, BC V6T 1Z4, Canada
关键词
D O I
10.1002/aic.690450204
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Wastes that can be treated by supercritical water oxidation often contain salts. Salts are almost insoluble under supercritical conditions and can result in severe fouling. A simple heat- and mass-transfer model was developed and tested experimentally for sodium sulfate in a fully turbulent flow of ater at 25 MPa. This model uses empirical heat-transfer correlations to estimate mass-transfer rates. The diffusion coefficient of the salt is calculated from the Stokes-Einstein relation using a hydrodynamic diameter of 2 to 6 Angstrom. New measurements to solubility showed that the solubility of sodium sulfate decreases by a factor of about 1,000 as the temperature increases from 380 degrees C to 400 degrees C. Salt deposition rates, inferred from the outside temperature of a heated test section, were reasonably close to the model predictions.
引用
收藏
页码:240 / 247
页数:8
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