Process dryers and evaporators that remove moisture or solvent or concentrate product streams, including spray, fluid-bed, freeze, flash, disc, coil, rotary and grain drying, falling-film and pilot evaporation, and distillation equipment. Includes integrated powder recovery and solvent-recovery configurations when part of the supplied drying or evaporation process. Retains food, pharmaceutical, mineral and by-product applications as qualifications of the functional equipment. Membrane concentration belongs with separation; refrigeration evaporators are heat-transfer equipment. Complete pollution or waste-treatment systems are outside scope.