Milling

Question 1

What rapid tests can be done at malt intake?

Answer 1

NIR spectroscopy (moisture/protein), dielectric moisture meter, bulk density measurement, pan sifter (2.2 mm sizing)

Question 2

What are the components of a grain handling system?

Answer 2

Intake hopper
Magnets
Bucket elevator
Conveying systems
Dust aspiration
Silos
A destoner
malt screening
Malt weighers
Manual dust cleaning

Question 3

What are the types of conveyors?

Answer 3

Screw conveyor
Chain and Flight
Pipe, chain and disc
Pneumatic

Question 4

What is a typical angle of repose?

Answer 4

30%

Question 5

What type of flow is required in silos? Typical angle?

Answer 5

Mass flow (vs funnel flow), 60 degrees

Question 6

What is the bulk density of barley?

Answer 6

0.5 t/m^3

Question 7

Three types of grain silo level determination

Answer 7

Plumb line, Radar level detection and load cells

Question 8

What temp should malt be stored below?

Answer 8

15 C

Question 9

What types of gas is common for silo fumigation?

Answer 9

Phosphine gas

Question 10

What are the three ways to manage dust explosion risk?

Answer 10

Prevent the ignition spark
Control the dust
Limit the explosion

Question 11

What are the two active forces in roller milling?

Answer 11

Compression and shear

Question 12

What are the 2 zones just above the mill rollers?

Answer 12

Slip zone and Nip zone

Question 13

What factors determine the throughput of a roller mill

Answer 13

Speed of rotation, length of rollers and the mill gap size

Question 14

What aspect of roller design increases the coefficient of friction and shear?

Answer 14

Fluting

Question 15

What is the degree of grain crush called?

Answer 15

Comminution

Question 16

What is moisture increased to in full steep well mill?

Answer 16

25-30%

Question 17

How does steep conditioned milling affect the husk?

Answer 17

Increase husk moisture to 18-22%

Question 18

Name 2 types of underwater mills

Answer 18

Meura hydromill and Dispax

Question 19

What do each set of rollers do in a 6 roller mill?

Answer 19

1st: breaks up kernel
2nd: mills out endosperm
3rd: comminutes the coarse grits

Question 20

What types of mills are possible for a mash filter?

Answer 20

hammer mill, underwater disc mill or Dispax

Question 21

What types of mills are possible for a later tun?

Answer 21

Full steep wet mill, steep conditioned mill, conditioned dry 6 roller mill

Question 22

What types of mills are possible for a mash tun?

Answer 22

2 or 4 roller mills