Evaporators for Stillage Concentration
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Evaporation for Stillage Concentration The spent residues that result as by-products from sugar and starch processes, yeast production, fermentation processes and alcohol distilleries are generally called spent wash, vinasses or stillage. Depending on the raw materials being processed, the following stillages exist: Molasses (vinasses) Grain stillage: wheat, rye, maize, triticale, sorghum stillage These thin liquor stillages contain all the nutrients of the raw materials except for their fermented starch and sugars: i.e. they contain proteins, fat, fibre, minerals etc. in greater...

Concentration and temperature The thin stillages resulting from alcohol distilleries typically have a concentration range of between 5 and 10 % TS. fermentation process (table). Viscosity of the concentrated liquor is normally the measure that determines the upper concentration limit. The final concentration that can be achieved depends on the type of raw material being processed, the qualities achieved by mechanical separation (the amount of suspended versus dissolved solids), and the The concentrate quality, dried stillage quality and fouling behaviour are largely influenced by the...

Evaporator selection Falling film and forced circulation evaporators are used for the concentration of stillage. Evaporator selection is normally determined by the required concentration ratio, the evaporation rate, the type of heating or heat recovery system, and in particular, by the viscosity and fouling characteristics of the stillage. Falling film evaporators are used for low viscosities, of up to about 100 cP and large evaporation rates. For higher concentration ranges, forced circulation evaporators are used, handling viscosities of up to 1000 cP, for example. A D F 2 1 A D F E 2 1 C...

Fig. 5: 4-effect falling film and forced circulation evaporator, heated by mechanical vapour recompressor, concentrating 125 tonnes/hr of whisky stillage, as per arrangement B (flow sheet in fig. 6) Fig.. 6 10 Plate preheater A Product D Live steam: 1 – 4 Falling film effects 11 Condenser B Concentrate E Deaeration 5, 6 12 Condensate vessel C Condensate F Cooling water 13, 14 Mechanical vapour recompressors Forced circulation effects 7 - 9 Straight tube preheater D 7 8 1 9 2 11 3 4 5 6 12 14 13 10 A C F E B

Fig. 7: 5-effect falling film and forced circulation evaporator, heated by dryer exhaust vapour, concentrating 140 tonnes/hr of stillage from 6.6 % to 35 % TS, arrangement C Fig.. 8: 1 – 3 Falling film effects 10 Vapour scrubber A, B Product, concentrate E Deaeration 4 Forcedc circulation effect 11 Vapour fans C1, C6 Cleaned condensate F Live steam 5 Separator 12 Condensate flash vessel C2 – 4 Vapour condensate G Cooling water 6, 7 Condensers 13 Exhaust stack C5 Foul condensate H Service water 8, 9 Condensate feed tanks D Dryer exhaust vapour I Exhaust air and vapour mixture

Animal feeds plant The following diagram depicts the most common process for the processing of wheat stillage, the DDGS (dried distiller’s grains with solubles) animal feeds plant. The raw stillage is first transferred through a highperformance centrifuge, where the wet cake containing about 30 % TS is decanted. The remaining thin stillage, from which suspended solids have been separated to the largest possible extent, is conveyed through buffer tanks to the evaporation plant, where it is concentrated to about 28 – 42 % Ts. The stillage concentrate from the evaporator and the wet cake from...

Overview on our Range of Products Membrane filtration – GEA Filtration to concentrate fluid food, process water, organic and inorganic solutions and waste water, to separate contaminations in order to improve quality and recover valuable substances. Distillation / rectification plants to separate multi-component mixtures, to recover organic solvents; to clean, recover and dehydrate bio-alcohol of different qualities. Alcohol production lines for industrial, neutral, extra neutral and drinking alcohol; integrated stillage processing systems Condensation plants with surface or mixing...