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ANDRITZ AG
Yeast drying

Yeast drying

Product catalog summary

Introduction
Brewer's yeast, a by-product of beer brewing, contains valuable nutrients such as amino acids, proteins, and minerals. ANDRITZ Gouda has developed an efficient drying process to transform this by-product into a valuable resource for food products.

Process Description
The process begins with the mechanical dewatering of wet yeast to achieve a 30% dry solids content using a decanter. The yeast is then fed into a drum dryer, where it is dried to a 95% dry solids content. The dried yeast is transported via a pneumatic conveyor, passes through a mill-sifter, and is stored in a silo before packaging.

Efficiency
Indirect drying on a drum dryer is more efficient than direct drying, as it requires less hot air and utilizes steam to transfer heat through the drum's metal wall. This method reduces energy consumption and eliminates the need for large dust recovery systems. To maintain low emissions, exhaust vapors should be cleaned in a biofilter.

The ANDRITZ Gouda Drum Dryer
The core of the process is the ANDRITZ Gouda double drum dryer, consisting of two cast iron cylinders heated with saturated steam. The yeast forms a thin layer on the cylinders, where water evaporates. The dry matter is scraped off with a knife, and the design ensures even pressure and uniform product removal.

Benefits

Compact, safe, and simple design
Ideal for drying brewer's yeast and yeast from alcohol plants
No additional autolysis required
High energy efficiency due to pre-evaporation

Company Overview
ANDRITZ Gouda, part of the ANDRITZ GROUP, has over 100 years of experience in providing process solutions for various industries. They offer comprehensive services from engineering to commissioning and have pilot plants for testing and scaling up processes.

Contact Information
For more information, contact ANDRITZ Gouda in the Netherlands or ANDRITZ AG in Austria.

Catalog excerpts

Yeast drying Added value instead of waste

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Brewer’s yeast Efficient indirect drying When brewing beer, yeast is produced then fed to a holding tank. From there, the as a by-product. This product is usually product is fed to the drum dryer by means Compared to direct drying processes, in- treated as waste. Brewer’s yeast, how- of a pump. As a result of the drum dryer’s direct drying on a drum dryer requires less ever, contains valuable ingredients, such heat treatment process, no further treat- hot air to achieve evaporation. The heat is as amino acids, proteins, and minerals. ment is needed to break down the yeast generated by steam,...

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The ANDRITZ Gouda drum dryer The heart of the process HOLDING TANK MILL SIFTER DRUM DRYER STORAGE STORAGE SILO PACKAGING MACHINE Yeast drying process Detail of a double drum dryer surface, the water in the thin yeast layer scraping and guarantees uniform product The heart of the installation is the ANDRITZ evaporates. When the cylinders have ro- removal. The knife pressure can be con- Gouda double drum dryer. The dryer mainly tated through two-thirds of a revolution, the trolled easily from outside the process area. consists of two cast iron cylinders that are dry, solid matter is scraped off...

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ANDRITZ Gouda ANDRITZ Gouda has been implementing complete process solutions for the environmental, chemical, and food industries for over 100 years. As a machine manufacturer as well as process solutions expert, ANDRITZ Gouda is able to handle all of the stages involved in designing and building plants, including engineering, service, installation, and commissioning. ANDRITZ Gouda, as part of the international ANDRITZ GROUP, has several pilot plants available to test new materials, generate design data, and provide representative product samples. The proven calculation model for scaling up to...

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Yeast drying

Yeast drying

Catalog excerpts

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