Shenzhou - Fish Oil Sludge decanter centrifuge to separate solid from liquid Decanter centrifuge

The purpose of separation is to separate out substances with different mass ratios from mixed fluid.Separation forms included solid-liquid separation,liquid-liquid separation and liquid-liquid-solid separation.
When mixed fluid enters rotating bowl of centrifuge through feed tube ,solids with larger density would rapidly deposit on inner wall of the bowl,forced by centrifugal acceleration.Then spiral pusher pushed deposited solids to taper end of the bowl,and discharges them out of centrifuge from residual outlet.Meanwhile ,liquid phase with smaller density forms a liquid ring layer and discharges from bowl through overflow port,the bowl and spiral pusher run at a high speed simultaneously ,for there exists speed discrepancy,deposited solids on the wall of bowl could be conveyed to residue outlet by spiral pusher.This separation process carry out continuously.

Separation technique
Feeding-gravitational separation-liquid discharge-sediment discharge.
Separation effect factors Centrifuging factor ,length to diameter ratio of cavity ,depth of fluid pool.
Field control
Bowl rotating speed ,rotative speed difference,between,spiral pusher and bowl depth of liquid pool.

Fish Oil Sludge decanter centrifuge to separate solid from liquid

Fish Oil Sludge decanter centrifuge to separate solid from liquid

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.

Fish Oil Sludge decanter centrifuge to separate solid from liquid

The separation into fish oil, stick water and protein-rich solids is performed in one to three stages, depending on the raw material and the desired purity of the final products. In the first stage there is always a decanter centrifuge. Optionally the oil can be separated further using a disk stack centrifuge for higher purity. Another option is a second clari- fication via the centrifuge to separate the fine solids from the stick water in order to reduce its viscosity for a higher concentration as well as to reduce fouling inside the evaporator.