Technical background In the field of environmental protection treatment, multi effect evaporation (MEE) or mechanical vapor recompression (MVR) evaporation is usually used to desalinate high concentration saline wastewater. During the evaporation process, the materials are continuously concentrated. At the same time, the organic matter (COD) with high boiling point, Ca2+, Mg2+ions are also concentrated and enriched in the evaporator, affecting the operation of the evaporator, mainly as follows: 1. The boiling point rises, and the heat transfer temperature difference decreases, resulting in a decrease in the evaporation capacity. 2. Foaming affects water production 3. Viscosity increase affects heat transfer 4. Organic matter enrichment polymerization, coking, affecting the stability of evaporation. 5.C...
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