krones yeast management
Vital cells for your brewing process
Cultivated growth
The high productivity of a brewery
is significantly influenced by fermentation and it is based on efficient yeast management. Since the
numerous individual steps of the
brewing process are closely and
mutually connected with yeast
management, utmost care is absolutely necessary, because only with
biologically faultless basic conditions for the yeast you will ensure
continuously high beer quality.
The Krones yeast management is
an easy and coherent concept and
covers all steps from the laboratory
to the yeast propagation as well as
from the yeast storage to the yeast
disposal. For yeast propagation, we
recommend the well-proven concept of the one-tank process which
guarantees a continuously high
vitality of your yeast.
krones yeast management
Trub separation
Wort kettle
Wort cooling
Bright beer tanks
Wort aeration
Yeast
management
Filtration
Yeast pitching
Maturing
Fermentation
Yeast crop
Influencing factors of
yeast management
Figures, data, facts
krones yeast management
Stationary
phase
Yeast propagation
After the phased cultivation of your
yeast cells in the laboratory, the
yeast culture will be fed to the production in the Carlsberg bottle.
In order to be able to always produce the required volume of yeast,
cultivation of yeast is continuously
kept in the log phase. The propagator volume is individually adjusted
to the requirement of the brewery.
Number of life cells
The yeast propagation comprises
the four following phases:
■■ Lag phase with activation of the
metabolism at low multiplication
but fast intake of oxygen
■■ Log phase with high metabolism
and fast intake of oxygen at maximum and constant growth rate
■■ Stationary phase with the start
of fermentation and the end of
the growth rate
■■ Decreasing phase with dropping
number of live cells
Decreasing
phase
Log phase
Lag phase
Time
The four phases of
yeast propagation
Figures, data, facts
Yeast propagation
krones yeast management
Basic principle of yeast propagation
systems
Yeast propagation in the one-tank
process
■■ Ensuring the high vitality of yeast
With the one-tank process – at cold
filling without steriliser – the sterile
wort is taken from the brewing process at the plate chiller. If all cleaning processes of the product pipes
and the propagator are performed
correctly, additional sterilisation of
the wort is not required.
The entire tank content of the propagation tank is mixed and evenly aerated by means of an external
mixing and aeration system. The
procedure is optionally performed in
a continuous or a batch operation.
cells by means of optimum aeration, a precise temperature profile, and efficient recirculation
■■ Provision of yeast quantity
required for the fermenting tank
■■ High hygiene for a safe yeast cell
cultivation
Figures, data, facts
Yeast propagation
1
2
3
4
5
6
7
Cell count
350
9
10
7.8
160
80
20
4
0
1
2
3
4
5
6
Tank content
Batch operation
74
1
2
3
4
5
6
7
8
7
8
9
10
11
14
350
12
300
10
250
8
200
6
150
4
100
2
50
0
0
12.5
10
7.2
11
12
1
3
4
5
6
7.9
8
6
14
22
15
8
9
Continuous operation
■■ New extract is provided with
■■ The propagator will be filled
tied; a yeast depot will remain.
again in two steps to 160 hl.
■■ The propagation can be main-
tained up to the next new batch
(4 – 6 treatments).
0
14
160
8.3
7.8
10
11
160
°P
7.5
80
13
14
15
8
6
4
2
15
12
12
10
15
7
2
16
11.5
10.4
80
Tank content
°P
13
11.5
20
2
7.5
°P
80
4
49
24
10.2
8.1
■■ The propagator is not fully emp-
each filling and the yeast suspension diluted again.
■■ The propagation is thus permanently maintained in the log
phase.
9
11.6
11.4
■■ The propagator is filled in three
steps from 4 to 160 hl.
55
23
15
10
0
115
8.3
98
119
7.8
4
50
11
10.2
7.9
150
50
110
90
12
10
7.9
Cell count
8.1
100
8.1
11.5
10.4
10.2
7.2
100
11.5
°P
0
11.6
7.2
200
4
150
14
11.6
11.4
°P
11.4
12.5
8
6
2
55
23
15
8
hl
28
10
0
115
12.5
200
10
Million cells/ml
7.8
90
74
50
250
7.9
250
12
110
100
300
10.2
8.1
7.2
150
Million cells/ml
11.6
0
16
°P
14
11.4
12.5
°P
200
hl
At the Krones one-tank process,
the yeast is provided in a propagator with divided cooling zones. This
way, a defined temperature management can be realised for different fill levels.
For discontinuous operation of the
brewhouse, a steriliser will supplement the line concept for buffering
the wort supply. Heating surfaces
or an external heat exchanger for
retaining the heat can be employed
here.
250
°P
The Krones procedure
krones yeast management
Figures, data, facts
Yeast storage
krones yeast management
Purpose of yeast storage
Vitalisation of crop yeast
■■ Storage of the yeast which is
weakened due the fermentation
process in the fermenting tanks
■■ Aeration and displacement of
CO2 in stored yeast
Activation of the pitching yeast
■■ Aeration of the yeast before add-
ing it to the fermenting tank
■■ Improvement of the yeast
metabolism and re-vitalisation
for accelerated fermentation
Tailor-made yeast
storage for more efficient
yeast management
Technical details
krones yeast management
External aeration unit for yeast
vitalisation
■■ Homogenisation and aeration of
the yeast
■■ Low shear stress in comparison
to the use of an agitator
■■ Flexible aeration intensity
through the variation of flow rate
and air volume
1
2
External aeration device
1 Yeast aeration nozzle
2 Recirculation pump
Yeast aeration nozzle
Your benefits
■■ Yeast management in an easy
and reliable process
The Krones yeast management is practical: The yeast propagation can be designed for
batch operation or for a continuous process. This way it can be
adjusted to the individual operating conditions. The yeast storage
integrated into the concept and
the yeast disposal will make your
daily brewing routine even more
efficient.
■■ Continuously high yeast quality
The external aeration system in
the area of the propagation and
storage render a safe and continuous yeast vitalisation.
krones yeast management
■■ High-performance beer produc-
tion
The coherently designed yeast
management enables efficient
fermentation. This results in optimum productivity and perfect
beer quality.
■■ Safe and hygienic production
conditions
Fully-automatic cleaning and
sterilisation processes in the
propagation and storage tanks
ensure high yeast culture safety.
Subject to technical changes · The illustrations can contain optional auxiliary equipment · PDF_en · 09/14
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krones ag
Böhmerwaldstraße 5
93073 Neutraubling
Germany
Phone +49 9401 70-0
Fax
+49 9401 70-2488
[email protected]
Internetwww.krones.com
kic krones
Internationale Cooperationsgesellschaft mbH
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93073 Neutraubling
Germany
Phone +49 9401 70-3020
Fax
+49 9401 70-3696
[email protected]
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Italy
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Fax
+39 0376.751012
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konplan s.r.o.
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301 00 Plzeň
Czech Republic
Phone +420 377 918 109
Fax
+420 377 918 139
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93149 Nittenau
Germany
Phone +49 9436 307 700
Fax
+49 9401 70 94 3700
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Oskar-von-Miller-Straße 6b
92442 Wackersdorf
Germany
Phone +49 9431 79857-0
Fax
+49 9431 79857-11
[email protected]
Internetwww.syskron.com