Plate evaporator

US5203406A · kind A · utility

Assignee

• Alfa-Laval Desalt A/S · DK

Inventors

• Ralf Blomgren · Skanör med Falsterbo, SE
• Niels CLAUSEN · Høng, DK

Key dates

• Filing date: May 1, 1992
• Grant date: Apr 20, 1993
• Expiry date: May 1, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F28D2021/0066
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

In a plate evaporator of the falling film type, every second plate interspace constitutes an evaporation space (28) in which evaporation liquid is distributed across the width of the plates in order to run downwardly on the plates, whereas the rest of the plate interspaces constitute condensation spaces (30) for a heat emitting vapor. The invention concerns a particular arrangement for supplying evaporation liquid to the evaporation spaces (28). According to this arrangement, a distribution chamber (27) is delimited within the uppermost part of each plate interspace constituting an evaporation space (28). This distribution chamber extends across the whole width of the plates and communicates with an inlet channel for liquid, extending through the plate package and formed by aligned openings (16) in the plates. In the upper part of each condensation space (30), several sealing means (25) are arranged horizontally spaced from each other. Each sealing means (25) forms together with the two adjacent plates a transferring chamber (29) that is closed from the condensation space (30), but through small holes (17, 18) in the plates communicates with at least one distribution chamber (27) a…