Point of reflection reconven

Question 1

What do finer husk particles of the hammer milled grist provide?

Answer 1

Greater surface area for contact with the sparge water

This is favourable for sparge leaching efficiency.

Question 2

What effect does a thin grain bed of 50 mm have on sparge leaching efficiency?

Answer 2

Reduces the contact time of the sparge water

This reduces sparge leaching efficiency.

Question 3

What is required for achieving efficient sparging in a mash filter?

Answer 3

Lower sparge flow

This is needed to achieve efficient sparging despite the lower sparge volume used.

Question 4

What is the benefit of using lower volumes of sparge water?

Answer 4

Enables higher gravity in the kettle

This is beneficial for high gravity brewing.

Question 5

What happens during the final compression phase of the mash filter?

Answer 5

Compressed air inflates the membranes to squeeze remaining wort from spent grain

This is a two-phased process: first at lower pressure, then at higher pressure.

Question 6

What is the target moisture content of spent grain after final compression?

Answer 6

Around 70 % w/w

This is achieved during the second phase of compression.

Question 7

What needs to be drained before opening the filter to prevent excess water/wort from falling into the spent grain hopper?

Answer 7

Inlet pipework and outlet pipework

If not done, excess liquid can cause issues for the spent grain transfer system.

Question 8

What happens to the membranes after the spent grain is discharged?

Answer 8

They are deflated and the hydraulic ram is withdrawn

This allows the plates to move freely for spent grain removal.

Question 9

What is the procedure for spent grain removal from the mash filter?

Answer 9

A moving ratchet latches onto the first plate to pull it away, allowing grain to drop into the hopper

This is repeated for all other plates.

Question 10

What may be needed after spent grain removal depending on various factors?

Answer 10

Manual scraping of excessive residual grain from the plates

Factors include plate design, raw materials, milling intensity, and moisture content.

Question 11

How long does it typically take to discharge spent grain into the spent grain hopper?

Answer 11

20 minutes

The transfer to spent grain silo takes significantly longer (60-90 minutes).

Question 12

What is required for the pneumoveyor to transfer spent grain?

Answer 12

High volume of compressed air

This is necessary to fluidise the spent grain and blow it through large diameter pipework.

Question 13

What does the dedicated air compressor do in the context of spent grain transfer?

Answer 13

Meets the demand for high volume of compressed air

This is crucial for the pneumoveyor system.