Milling Flashcards
(23 cards)
What rapid tests can be done at malt intake?
NIR spectroscopy (moisture/protein), dielectric moisture meter, bulk density measurement, pan sifter (2.2 mm sizing)
What are the components of a grain handling system?
Intake hopper
Magnets
Bucket elevator
Conveying systems
Dust aspiration
Silos
A destoner
malt screening
Malt weighers
Manual dust cleaning
What are the types of conveyors?
Screw conveyor
Chain and Flight
Pipe, chain and disc
Pneumatic
What is a typical angle of repose?
30%
What type of flow is required in silos? Typical angle?
Mass flow (vs funnel flow), 60 degrees
What is the bulk density of barley?
0.5 t/m^3
Three types of grain silo level determination
Plumb line, Radar level detection and load cells
What temp should malt be stored below?
15 C
What types of gas is common for silo fumigation?
Phosphine gas
What are the three ways to manage dust explosion risk?
Prevent the ignition spark
Control the dust
Limit the explosion
What are the two active forces in roller milling?
Compression and shear
What are the 2 zones just above the mill rollers?
Slip zone and Nip zone
What factors determine the throughput of a roller mill
Speed of rotation, length of rollers and the mill gap size
What aspect of roller design increases the coefficient of friction and shear?
Fluting
What is the degree of grain crush called?
Comminution
What is moisture increased to in full steep well mill?
25-30%
How does steep conditioned milling affect the husk?
Increase husk moisture to 18-22%
Name 2 types of underwater mills
Meura hydromill and Dispax
What do each set of rollers do in a 6 roller mill?
1st: breaks up kernel
2nd: mills out endosperm
3rd: comminutes the coarse grits
What types of mills are possible for a mash filter?
hammer mill, underwater disc mill or Dispax
What types of mills are possible for a later tun?
Full steep wet mill, steep conditioned mill, conditioned dry 6 roller mill
What types of mills are possible for a mash tun?
2 or 4 roller mills
