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Alfa Laval CH-38 GOF Separator
Alfa Laval separators for the starch industry are available in many different sizes and configurations, each one designed and adapted for dealing with the widely varying separation tasks required. The Merco CH-38 GOF is a dedicated starch centrifuge, designed for several applications in the maize wet milling process.
Applications
The CH-38 GOF is a nozzle centrifuge designed for continuous discharge of solids. It is used for classification of solids according to size, dewatering and washing of solids, and for clarification of liquids containing relatively high concentrations of solids.
The machine is Alfa Laval’s largest nozzle centrifuge for the maize starch industry. It is related to the widely used CH-36 but has a higher capacity and a larger bowl. It has a lower power consumption and is easier to assemble and disassemble.
The CH-38 GOF is used for processes that include primary separation, gluten thickening, millstream thickening and middling separation. Other common applications include washing and concentration of solids in the production of industrial minerals and chemicals.
Standard design
The centrifuge is equipped with sensors for monitoring bowl speed, vibration, temperature and oil pressure. Thirty peripheral nozzles are directed at a small angle to the tangent in order to recover energy from the material being discharged.
Special features
The CH-38 employs a special recirculation system that provides highly efficient separation. Solids can be recirculated to the nozzles at the same time as wash water is being recirculated. Working with the underflow draw-off valve, the return flow system provides a unique means of controlling the separation process. It allows the operator to control and optimise the separation process – by determining how much underflow is to be removed, how much is to be recycled back to the rotor and how much wash water is to be added. This makes it possible to use nozzles with a large diameter, which act as buffers to even out variations in feed concentration and to prevent blockages. The machine thus becomes more versatile, and can be easily adapted to changes in procedure.The machine also features a built-in hydraulic hoist that eliminates the need for an external lifting device, and thus reduces the downtime required to service the centrifuge.
Basic equipment
The centrifuge is equipped with a motor, a self-cleaning strainer for the feed, speed and vibration sensors, oil temperature sensors for the spindle bearings and the motor winding, a hydraulic power unit for the lifting hoist, a set of special tools and a standard set of spares.
Options
Control-torque motors of four different power ratings are available. Frequency drive is also possible. The centrifuge bowl can be configured in classifier (PS) or clarifier (GT, MST, and CL) execution, with different disc spacings. A double underflow outlet is available for the MST version.