Lesson 4 - Wort Separation Technology
This lesson deals with wort separation technology. The variables of Darcy’s Law are re-visited, to demonstrate how they influence the design of the lauter tun, mash tun, and mash filter. The key design features and control methods of these wort separation devices are identified. Typical operational steps and times are also established for each device.
Lauter Tun Design and Operation
Table: Design and operational parameters for the Lauter Tun for 10 t grist
|
|
Lauter Tun |
Mash Tun |
Mash Filter |
|
|
|
Tun diameter (m) |
8 |
5 |
20 (58 chambers) |
|
|
Grain bed loading (kg/m²) |
200 |
500 |
30 |
|
|
Cycle time (min) |
144 |
288 |
110 |
|
|
Brews per day |
10 |
5 |
13 |
|
|
Milling system |
Wet / six-roll dry |
Two / four-roll dry |
Hammer |
|
Q |
Wort flow rate (hL/h) |
889.2 |
378 |
1522.9 |
|
K |
Bed permeability (m²) |
3.084 x 10-11 |
9.72 x 10-11 |
3.525 x 10-13 |
|
K |
Relative permeability |
87 |
275 |
1 |
|
DP |
Maximum limit (bar) |
0.1 |
0.1 |
0.3 |
|
A |
Filtration surface area (m²) |
50 |
20 |
330 |
|
Mash Water (L/kg) |
3.3 |
2.5 |
2.7 |
|
|
Sparge water L/kg |
4.0 |
5.0 |
2.8 |
|
|
Malt modification |
Less well |
Well |
Less well |
|
|
Mash temperature (˚C) |
76 |
65 |
76 |
|
|
µ |
Wort viscosity (mPa.s) |
1.25 |
1.85 |
1.65 |
|
L |
Grain bed depth (m) |
0.5 |
1.0 |
0.05 |
Point of reflection: We can see from the above table that the lauter tun strong worts flow rate Q, is more than twice that of the mash tun. Why do you think this is? Use the table to identify their differences and formulate the reasons that the lauter tun strong worts can be collected faster. Give yourself 5-10 min to think about this and then click ‘Next’ to continue with this lesson.