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The
seeds of papilionaceous plants are called peas or beans.
They belong to the most popular types of vegetables and
are characterised by a high percentage of high-grade storage
proteins, e.g. legumin and vicilin. Peas are greatly valued
as a result of their high protein content – particularly
in the animal feed industry. The protein-rich pea flour
is used in animal husbandry, whereas the low-protein product
is used in foodstuffs, baby food, cosmetics and mast fodder.
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The properties of pea flour also make it ideal for use
in the manufacture of soups and bakery
products such as pizzas, etc. for human consumption.
There are no gastric effects caused by fibrous materials
and the DNA purity is guaranteed.
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For the production of protein-enriched pea flour, Alpine
supplies special processing systems to process whole peas
into a high-protein and a low-protein pea flour.
The peas are precrushed with an Alpine HA hammer mill,
and the shell fraction is subsequently separated using
an Alpine MZM zigzag classifier.
For the protein enrichment step, the precrushed and cleaned
material runs though a metal separator before entering
the Alpine Zirkoplex ZPS classifier mill for fine grinding.
As shown in the flowsheet, this classifier mill is switched
in-line and upstream of an Alpine Turboplex ATP ultrafine
classifier, which separates the pea flour into a high-protein
and a low-protein fraction.
The high-protein product is separated from the classifying
air in a downstream automatic reverse jet filter.
Dependent on the required protein values in the end product,
the amount of high-protein pea flour extracted from the
mass flow is approx. 35% and of low-protein pea flour
approx. 65%.
The product separation can be varied by altering the system
parameters.
Protein values from up to 60% are possible in the protein-rich
fraction. |
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The schematic shows a system configuration for protein
enrichment.
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Legend
1 = Feed bin (whole peas)
2 = Feed metering unit
3 = Metal separator
4 = Hammer mill
5 = Dust extraction unit
6 = Material collection bin
7 = Rotary valve
8 = Zigzag classifier MZM
9 = Cyclone
10 = Butterfly valve
11 = Fan
12 = Feed bin (shelled, precrushed peas)
13 = Feed metering unit
14 = Metal separator
15 = Zirkoplex classifier mill ZPS
16 = Suction-side silencer
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17 = Turboplex ultrafine classifier ATP
18 = Automatic reverse jet filter
19 = Fan
20 = Outlet-side silencer
21 = End product silo (low-protein pea flour)
22 = Shut-off valve
23 = End product silo (high-protein pea flour)
24 = Packing machine
25 = Control cabinet
A = Feed product
B = Precrushed, shelled peas
C = Pea shells
D = Low-protein pea flour
E = High-protein pea flour
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