Underwater Milling Flashcards
(15 cards)
What is the primary advantage of underwater milling?
Best control of oxygen pick-up
Underwater milling allows for fine comminution and minimizes oxygen exposure.
Name the two technologies that work on the principle of underwater milling.
- Meura Hydromill™
- DISPAX-REACTOR®
These technologies are mentioned for illustrative purposes only and are not endorsements.
What type of mill is the Meura Hydromill™?
Underwater disc mill
It uses a rotating disc and fixed disc to grind malt and water.
What is the peripheral speed of the Meura Hydromill™?
40 m/s (1,275 rpm)
This speed is crucial for effective milling.
How does the Meura Hydromill™ process the malt and water?
Malt and water enter at the center and are sheared between rotating and fixed discs
The grinding produces very small particles suitable for mash filters.
What is the function of rotary valves in the Meura Hydromill™?
To keep dry parts dry
This allows for independent cleaning of the steep tank and mill.
What is the DISPAX® primarily used for?
Dispersing solids in liquids and mixing duties in food production
It is a three-stage, high shear machine.
What happens to the mixture in the DISPAX® during processing?
It is vortexed at very high turbulence through increasingly small gaps
This shears apart the grains effectively.
What is the rotor speed of the DISPAX®?
21 m/s
This speed subjects the grains to extreme forces for fine comminution.
What types of materials can both the DISPAX® and the Hydromill™ mill?
- All types of malt
- All levels of modification
- All types of adjuncts
They are versatile in milling capabilities.
What is a common feature of both the DISPAX® and Hydromill™ regarding water usage?
They use deoxygenated water and can be purged with CO2
This minimizes oxygen pick-up during milling.
True or False: The DISPAX® is still offered for brewing applications.
False
The supplier no longer offers the DISPAX® for brewing.
What are the energy consumption characteristics of both the DISPAX® and Hydromill™?
They consume a lot of energy
Both machines are equipped with very large motors.
What is a safety advantage of underwater milling?
No risk of explosions
Milling underwater reduces hazards associated with dry milling.
Fill in the blank: The Meura Hydromill™ has a milling gap that can be adjusted by moving the _______.
rotating disc
Adjusting the milling gap affects the particle size distribution.
