Steinecker Variomill and PowermillFlexibility for milling

2 ｜Steinecker Variomill and Powermill

High beer quality and efficient processes perfectly prepared during milling

Milling with the Variomill and Powermill technology provides excellent grist results from malt and raw grain. This means a top level extract yield and perfect lautering results. The Variomill family with its two-roller models V5, V10, V16, V20 and the four-roller model V25, covers a performance range suitable for small up to industrial breweries. The Powermillwith its extra large roller diameter for a maximum grist milling rate complements the program.

At a glance− Exact control of a grist milling rate for a constant mash

quality− Variable adjustment of the steeping water temperature and

quantity, the steeping time and the milling gap− Model variants with an output of 5 tons per hour up to

40 tons per hour

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Method of operation

− The malt hopper receives the weighed grist for a brew. Optionally, the malt hopper can be put on load cells.

− In the steeping chamber, hot water is added for conditioning. The grade of steeping can be influenced by controlling the water temperature and water quantity as well as the duration of action.

− The crushing rollers crush the conditioned malt using a software-supported milling rate control.

− In the mash chamber, the grist is mixed with brewing liquor to obtain mash. This completely prevents formation of dust.

Malt hopper

Steeping chamber

Crushing rollers

Mash chamber

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Assemblies in detail − steeping chamber

− In addition to water temperature and quantity, the duration of action is the main factor used for conditioning control.

− If the milling rate is specified, the duration of action will depend on the malt level in the steeping chamber. If the level is higher, the duration of action will be longer than for a lower level.

− Feed roller 1 controls the level of the malt in the steeping chamber.

− Feed roller 2 controls the milling rate depending on the power consumption of the crushing rollers.

Feed roller 1

Level probe

Level I

tI

Level II

tII

Feed roller 2

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Assemblies in detail – milling rate control system

The constant milling process results in a homogeneous mash quality and, at the same time, ensures an optimum roller service life.− The feed characteristics of malt and other raw materials vary

in their quality. For a constant milling rate, the supply of the grist must be controlled.

− During the milling process, the motor output of the crushing rollers is the measurand for the milling rate.

− The feed roller controls the feed according to the measured motor output.

− After milling has been finished, the achieved rate is measured and the rated motor output is recalculated for the following milling process.

Motor

Power measurement

Speed control system

Motor

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Assemblies in detail – crushing rollers

Variomill− The milling gap can be automatically adjusted within a range

of 0.2 – 1.2 mm to exactly suit the different raw materials, such as barley malt, wheat malt or raw grain.

− Temporary adjustment of the crushing rollers' wear is quickly performed by reducing the milling gap.

− No production stop is required for adjusting the milling gap.

Powermill− The Powermill is equipped with the largest rollers of this mill

class, with a length of 2,000 mm and a diameter of 510 mm.− A large roller diameter D allows a longer contact time T of the

grist between the crushing rollers.− The length of the rollers provide a large passage area and

ensure the efficient infeed of the grist.− This provides an optimum milling result and the best possible

roller service life.

Drive motor Milling gap adjustment

Advantage of the large roller diameter and length of the Powermill

D = large diameterd = small diameterT = long contact timet = short contact time

7 ｜Steinecker Variomill and Powermill

Assemblies in detail – mash chamber

A straightforward and efficient plant technology ensures top mash quality and dust-free mash production.− The grist is mixed with the brewing liquor directly below the

crushing rollers.− As a result, oxygen absorption is low and oxidation processes

in the mash are reduced.− The mash pump with inducer prevents the formation of lumps

and guarantees conveyance with low shear forces.

Brewing liquor

Brewing liquor

Conditioned malt

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Technical data

Performance data (at maximum mill output)

Variomill type V5 V10 V16 V20 V25 Powermill

Milling output, malt* t/h 5 10 16 20 25 40Number of crushing rollers Pcs. 2 2 2 2 4 2Roller length mm 600 1,000 1,200 1,200 1,200 2,000Installed motor capacity kW 21 41 55 74 74 115Total weight kg 1,650 3,000 5,650 5,650 8,650 10,190Total height (mill + steep)

mm 3,160 3,275 3,660 3,660 4,345 4,640

The following values are guide values and may vary depending on the line. Ensure a water pressure of 3 bar.Steeping water up to 65 °C and 0.3 - 0.5 hl/100 kg malt

hl/h 20-40 40-80 65-130 80-160 100-200 160-300

Mash water up to 62 °C and 2.2 hl/100 kg malt

hl/h 65-125 135-255 220-410 270-500 340-550 540-1,000

* Depending on the malt quality, approx. ± 5 % deviation

Official acceptance results of a Variomill V25

Settings

Output t/h 25Distance between pair of top rollers mm 1.20

Distance between pair of bottom rollers

mm 0.55

Mill-specific quality parametersDegradable extract of the spent grains % 0.7*Photometric iodine value in the wort 0.3*

Lauter tun, total action time h 2Lautering time with turbidity < 20 EBC % 75

* EBC analysis method

9 ｜Steinecker Variomill and Powermill

Your benefits in figures

Using the Variomill or Powermill technology − can increase productivity as the specific false bottom load in

the lauter tun can be increased for conditioned malt. A higher number of brews, stronger worts or larger brews can be achieved.

− can counteract a fluctuating raw material quality by means of the degree of steeping and the milling gap (only on Variomill).

Dry grist VariomillGrist/t 8.0 8.0Diameter LB/mm 7,500 7,500False bottom load kg/m² 181 181Maximum number of brews 10 12

Or high gravity:Maximum number of brews 10 10False bottom load kg/m² 181 207Grist/t 8.0 9.1

Dry grist PowermillGrist/t 18.0 18.0Diameter LB/mm 11,000 11,000False bottom load kg/m² 189 189Maximum number of brews 9 11

Or high gravity:Maximum number of brews 9 9False bottom load kg/m² 189 229Grist/t 18.0 21.8

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Benefits to you

High yieldThe adjustment of steeping times and temperatures ensure optimum conditioning of the grist. This is the basis for excellent lautering results and speeds.

Optimal for high-gravity processes Higher loading of the lauter tun is possible as compared to dry milling.

Hygienic designThe Varomill and Powermill grist mills are completely suitable for CIP, cleaning being performed with hot caustic only.

No dust during milling The grist mill design does not require any precautions outside the guards, as the mash is directly produced within the mill.

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Everything from a single source

KIC Krones cleaning agents make your machine shineOnly if the production environment is immaculate, can your product be brilliant. KIC Krones provides you with the optimum cleaning agents and disinfectants for each individual production step.

KIC Krones lubricants for every production stepWhether for gears, chains or central lubrication systems – our greases and oils are true all-round talents. They can reach every lubrication point, protect your line and ensure gentle treatment for your products thanks to their food-grade quality.

Evoguard – excellent valve technology all along the lineThe valve series of Evoguard comprises a modular system with hygienic and aseptic components which contributes to every point of the production line with increased performance and which has the perfect solution for every process step.

Evoguard – pumps for absolute process safetyIn addition to the separation and locking of a line, one thing is particularly important – and that is the reliable conveyance of your product. This is why Evoguard also offers innovative centrifugal pumps in addition to high-quality valves.