Double Effect Forced Circulation Evaporator
industrial apparatus for converting liquid into vapour. The single-effect evaporator consists of a container or surface and a heating unit; the multiple-effect evaporator uses the vapour produced in one unit to heat a succeeding unit. Double-, triple-, or quadruple-effect evaporators may be required in industrial and steam heating plants.
Some evaporators are used to concentrate a solution by vapourizing and eliminating water, as, for example, in a concentration plant for sugar and syrup. In purification processes, such as the desalination of seawater, evaporators convert the water to vapour, leaving mineral residues in the evaporator. The vapour then is condensed into (desalinated) water. In a refrigeration system, the cooling effect is produced as the rapid evaporation of the liquid refrigerant absorbs heat.
Proposed Evaporator is Double Effect Forward Feed Evaporator which means feed will enterin 1st Effect and concentrated outlet will be withdrawn from 2nd Effect. Feed will beconcentrated in Two stages. All two stages are Forced Circulation Type. Calandria and Vapour Separators are installed separately and they are connected through circulation lines.
Vapour Thermo Compressor is attached to the 1st Stage Calandria. Live and saturated motivesteam will be fed to Thermo Compressor. Suction of the Thermo Compressor is connected tothe vapour separator of 1st Stage from where fixed amount of water vapours will be sucked.D ischarge of Thermo compressor will have mixture of motive steam and water vapours. This discharge is connected to the shell side of 1st Stage Calandria.
Evaporated water vapour from 1st Stage Vapour Separator will be fed to the shell side of 2ndStage Calandria. Partial amount these water vapours have already been sucked by ThermoCompressor. Evaporated water vapours, thus generated in 2nd Stage Vapour Separator will becondensate in Surface Condenser.
Condensate from 1st Calandria will go to 2nd Stage Calandria through U Seal. Condensate from2nd Calandria will go to the suction of condensate pump. Discharge from Condensate Pumpwill be collected in Condensate Pot. Similarly, condensate from surface condenser will also becollected in the same condensate pot through barometric sealed pipe line.
Vacuum is generated through Vacuum Pump in whole system. Non condensable lines areprovided in each stage for removal of non condensable.