Vacuum-evaporating installation for stillage

Vacuum evaporating installations are included in stillage recycling lines.

The stillage recycling issue must be dealt with in every distillery because of the following reasons:

- Stillage is a major pollutant of groundwater and water.

-Stillage contains considerable amounts of valuable substances (proteins, sugars, mineral and organic salts) which can be processed to feed, organic fertilizers or fuel.

The technological process consists of three main processes

Schema:

– separating the liquid from the solids, concentrating and drying.

The concentration process is performed by vacuum evaporating installations. Usually triple or quadruple effect installations are used, because this solution is more energy efficient mostly when it comes to steam. We also offer other solutions for steam economy:

- Jet compressor – it’s specific steam consumption can reach 0.25 kilograms of steam per one kilogram of vaporized water in triple effect installations and 0.2 kilograms in quadruple effect installations.

- Mechanical thermo compression of back pressure steam.

- Using the vaporized water from drying to heat another evaporator or adding it to the flow of back pressure steam.

The most common method for thin-layer evaporation is “falling film”. When using this method stillage pours in on the inside walls of vertical pipes.

Forced circulation is used for evaporators with high concentration of the product

Depending on the installation and stillage characteristics, the content of solids after vacuum evaporation is between 28 and 38%.

Surface condensers are widely used in stillage vacuum evaporations installations, because they do not pollute the water in the cooling towers, unlike the barometric condensers.

Vacuum-evaporating installation for stillage

References