Equipment for the Bio Ethanol process

Whether wet or dry, grain based or cellulosic, ANDRITZ FEED & BIOFUEL has the technology and the equipment to prepare the feed stock prior to fermentation, and to pelletize the DDGS byproduct after distillation.

Dry Grinding
There are two steps common to all ethanol processes – fermentation and distillation, however there are many process variables involved in preparing various feed stocks prior these two common steps.
This where ANDRITZ FEED & BIOFUEL’s grinding technologies provide solutions.
In most grain based processes hammer mills are used to reduce the grain to the required fineness.
Fineness of grind varies between processes the range of hammer mills offered to a current maximum of 450 kW (600 HP) assures that grinding capacity for today’s largest plants can be accommodated. 10 – 80 Tph per mill.
Particle sizes 250 – 800 microns dep on selection of screens.

Roller mills:
The dry grind alternative to hammermills

• In process particle size control
• High energy efficiency
• Modular design
• Easy maintenance
• Fast roll changes
• Automatic roller adjustment

Wet milling:

• Wet milling is used extensively in preparing corn for fermentation and distillation.
• In the conventional wet milling process, disc mills manufactured by ANDRITZ FEED & BIOFUEL are used to de-germ and to fine grind.
• There are other “shortened” wet processes that are specific to ethanol in operation.
• Here again disc mills provide the de-germination and fine grinding. Another area that is currently being explored is the use of disc mills to grind newly harvested un-dried corn - or- high moisture ensiled corn.
• The preparation of cellulosic materials for ethanol also requires grinding. Depending upon the type of material and its’ moisture content hammer mills or disc mills may be applied to provide the required fineness.

Mixing agitator DA

• ANDRITZ FEED & BIOFUEL continuous double agitator (DA) mixers
• One of the most commonly used mixer in the Bio ethanol industry
• Applied to blend the ground grain with water and yeast rich recycle prior to fermentation – and –
• Applied to blend decanted wet cake with evaporated thin stillage and dry recycle to provide a flowable feed for the DDGS (dried distillers grains) dryer.