Autumn 2017 EN

Biogas Journal | Autumn_2017 English Issue
The BioChipper by BioG, an Austrian company, is a combined unit. Basically it is a flail mulcher with hammer
flails that crush the maize stubble and the stover. At the same time, the material is picked up via the air suction
produced by the flail shaft and transported onto a cross conveyor belts, which then deposit the stover onto
the windrow. The maize stubble is very short, which is very good for controlling the European corn borer. However,
the machine does not deliver all the stover to the windrow, which is not problematic in practical terms.
ing maize stover potential were harvested
without any loss, the methane yield per
hectare [(stover yield in tonnes dry matter
per hectare * specific methane yields in
Nm 3 CH 4
(t odm) * organic dry matter content]
would be between 3,000 and 3,500
Nm 3 CH 4
per hectare, somewhat less than
half of that for silo maize. The later the harvest,
however, the lower the methane yield
per hectare because the specific methane
yields decrease with increased ripening
(often significantly) and the maize stover
potential is generally reduced. Probably
losses due to disintegration of leaves are
responsible. The variety selected can also
play a role, although due to the pronounced
seasonal effects, a clear effect based on
variety has not yet been confirmed. But
because current grain maize varieties have
not yet been grown for combined use, improvements
can certainly be expected as
cultivation progresses.
Removal rates and methane
yields per hectare
In the harvest technology trial, with a maize
stover potential of 9.8 to 11.7 tonnes per
hectare, average stover yields of 4.6 to 6.3
tonnes dry matter per hectare were removed
under standard practical conditions. That
corresponds approximately with practical
experience: These yields are estimated between
3 to 7 tonnes dry matter per hectare.
Therefore, suitable amounts of substrate
can certainly be recovered, but at the same
time, harvest losses are often still very high
and are frequently of the same magnitude
as the harvest amounts.
All of the harvesting methods tested proved
feasible. In the individual years, significant
differences in the removal rates could be
determined among the four windrowing
technologies; in the three-year comparison,
however, nearly identical removal rates were
obtained. Field choppers and loader wagons
proved to be completely equivalent in terms
of removal rates, although the cutting is
more intensive with the field chopper.
Particularly the harvest conditions also affected
the removal rates. For example, delayed
stover recovery, i.e. the maize stover
remained in the field for a longer period
following the grain harvest, had primarily
a negative effect on the removal rates.
The dry matter contents of the recovered
maize stover varied widely in the individual
trial years and averaged 40 to 45 percent
(2014/2016) and 60 percent (2015). Immediately
before grain threshing, however,
Anlagenbau
Your reliable partner for:
Agritechnica
in Hannover
Hall 23, Stand C35
Substrate preparation and
crushing technology
the right preparation
technology for each
substrate
l Optimatic hammer mill
l with bypass solution
l specifically for fibrous
materials
l Impact Crusher HPZ 1200
l For use with high-wear
substrates or organic
waste, i.e. deep litter
l Throughput: 8 - 12 t/h
Push floor container
l steel construction
l volume 40 - 200 m³, as twin
container up to 300 m³
l sliding frames made
of stainless steel, plastic
lining
l optional dosing- or
disintegrating roller
Pull bottom system
l concrete construction
l upper-underfloor
passable
l volume 80 - 175 m³
l sliding frames made
of stainless steel, plastic
lining
Compact system
l Complete made of
stainless steel
l volume 13 - 33 m³
l with two dosing roller
PART OF THE
HUNING GROUP
HUNING Anlagenbau GmbH
& Co. KG
Wellingholzhausener Str. 6
D-49324 Melle
Phone +49 (0) 54 22/6 08-2 60
Fax +49 (0) 54 22/6 08-2 63
info@huning-anlagenbau.de
15
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