Hammer Mill

Question 1

What is the rotor position in vertical hammer mills?

Answer 1

The rotor is positioned vertically

Question 2

How do beaters move in vertical hammer mills?

Answer 2

Beaters move horizontally

Question 3

What is a notable energy-saving feature of some vertical hammer mills?

Answer 3

Operate without the need for aspiration

Question 4

What is the footprint size of vertical hammer mills compared to horizontal mills?

Answer 4

Smaller footprint

Question 5

What is the noise level of vertical hammer mills compared to roller mills?

Answer 5

Noisier than roller mills but produce less noise than horizontal mills

Question 6

What type of rotor do horizontal hammer mills have?

Answer 6

Horizontal rotor

Question 7

What is the comminution method used in horizontal hammer mills?

Answer 7

Grain is comminuted with beaters rotating in the vertical plane

Question 8

Which type of hammer mill is more suited to large breweries?

Answer 8

Horizontal hammer mills

Question 9

What is a characteristic of the comminution chamber in horizontal hammer mills?

Answer 9

Area that isn’t striking/cutting plate is screen

Question 10

What size of grist particles do hammer mills produce?

Answer 10

Very small grist particles

Question 11

What effect does hammer mill operation have on grain temperature?

Answer 11

Causes an increase in temperature

Question 12

What does the Meura Carbomill use to exclude oxygen?

Answer 12

CO2

Question 13

How much CO2 does the Carbomill use per ton of malt processed?

Answer 13

3-4 kg of CO2

Question 14

What is a benefit of using CO2 in the Carbomill?

Answer 14

Prevents explosions

Question 15

What are the maintenance costs of hammer mills compared to dry roller mills?

Answer 15

Low maintenance costs

Question 16

What is the extract efficiency of hammer mills compared to other mill types?

Answer 16

Best extract efficiency of all mill types

Question 17

What is the highest energy requirement of hammer mills?

Answer 17

4.4 kWhr/t of malt

Question 18

True or False: Hammer mills are the quietest mill type.

Answer 18

False

Question 19

What is the greatest risk associated with hammer mills if not purged with CO2 or nitrogen?

Answer 19

Oxidation

Question 20

What risk is increased due to the comminution of acrospire in the mash?

Answer 20

LOX activity

Question 21

What material is too friable to mill in hammer mills, producing only dust?

Answer 21

Black malt and roasted barley

Question 22

Fill in the blank: Hammer mills can only supply _______.

Answer 22

mash filters