Three phase horizontal screw centrifuge fish oil decanter centrifuge
The Shenzhou centrifuge process is considered to be the standard fish meal process and was developed to recover fish
meal and fish oil from whole fish or from residuals such as heads, fins, bones, etc. This procedure is usually applied in large scale fish filleting plants which process more than 8 tons per hour. In South America it is the most used process to produce fish meal and fish oil from anchoveta.
In the first process stage the raw material is heated so that it disinte- grates and releases the fish oil. After cooking, the material passes through a screening stage to be separated into a protein-rich solid phase and a liquid phase containing oil, water and fine solids. Next, the solids phase from the screens is separated further via presses into a press cake and a liquid phase. Finally the press cake is dried to obtain the fish meal.
The liquid phase from the screening and pressing stages is separated into fish oil, stick water and solids. For this separation there are two options: A two-stage separation where a clarifying decanter separates the solid material followed by a disk stack centrifuge to skim the fish oil from the stick water. In contrast, the Shenzhou centrifuge enables this 3-phase separation in one single stage.
Afterwards, the stick water is concentrated into a syrupy consistency through evaporation. This syrup and the solids cake from the Decanter are mixed together with the press cake and thermally dried.