biomass cogeneration plants - fraunhoferthe boiler fi ring system is equipped with a staged air...
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F R A U N H O F E R I N S T I T U T E F O R F A C T O R Y O P E R AT I O N A N D A U T O M AT I O N I F F M A G D E B U R G
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BIOMASS COGENERATION PLANTS
1 ORC module evaporator.
2 Biomass heating plant in Templin.
The Motivation
Increased utilization of the capacity of its
existing drying kilns and the addition of a
high temperature drying chamber increased
Holzindustrie Tem plin GmbH’s heat require-
ments. It wanted to generate heat from
re newable energies and envisioned a green
plant solution utilizing heat recovered from
untreated timber. Independence from fossi l
fuel prices would create a supply solu-
tion with stable costs. Process heat could
be provided, e.g. to dry timber, and the
simultaneous production of power would
generate further returns from revenue from
Renewable Energy Act tariffs.
The Objective
The objective was to supply needed heat by
burning untreated timber effi ciently and
with low emissions.
Timber processing residues, e.g. bark,
wood chips, shavings and sawdust, were
to be used. Part of the heat would be con-
verted into power by cogeneration employ-
ing an or ga nic Rankine cycle (ORC). The
ORC attains higher effi ciencies than the
con ventional Clausius-Rankine cycle (steam
power) and cuts plant operating costs since
it neither requires fresh water or chemicals
for water treatment nor produces waste-
water.
The Principle
A biomass-fi red cogeneration plant with a
thermal output of 3.5 MW was developed,
engineered and built for the company. The
plant’s electrical effi ciency with the imple-
mented ORC is stable over a large power
spectrum. It generates approximately 600
kW of electrical power, which is supplied
to the public grid.
Fraunhofer Institute for
Factory Operation and
Automation IFF
Prof. Michael Schenk
Sandtorstrasse 22
39106 Magdeburg
Germany
Contact
Process and Plant Engineering
Dr. Matthias Gohla
Phone +49 391 4090-361
Fax +49 391 4090-366
www.iff.fraunhofer.de
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The boiler fi ring system is equipped with a
staged air supply and fl ue gas recirculation
to minimize nitrogen oxide emissions. The
automatic boiler control system continually
adjusts the quantities of air, fuel and reci-
gas to assure optimal burnout and thus low
carbon monoxide emissions and little resid-
ual carbon content in the ash.
Our Service – Your Success
Supplying all of the plant’s fuel from timber
processed for the production facility elimi-
nates otherwise disposing of waste wood
by hauling it to other users. The cogenera-
tion concept supplies process heat and the
operator profi ts from revenues from
the sale of electricity.
The process engineering and automation
of this version of the plant and the pres-
sureless operation of the boiler eliminate
any need for staff to monitor it constantly.
Following a planning, approval and con-
struction period of less than one year, the
plant has been in proper continuous ope-
ration since December of 2005.
The Fraunhofer IFF has also completed oth-
er innovative projects with highly effi cient
conversion technologies. If you are interest-
ed, contact us any time.
Our Expertise – Your Edge
The Process and Plant Engineering Business
Unit has many years of experience plan-
ning, engineering, installing and commis-
sioning combustor and gasifi er prototypes
in the lower industrial performance range.
We develop state-of-the-art ther mal con-
version systems and produce customized
plants that recover energy from biomass,
biogenic residues and high calorifi c wastes
for our clients.
In the process, the Process and Plant Engi-
neering Business Unit responds to and fac-
tors in your company’s individual circum-
stances in order to identify innovative solu-
tions, which can be integrated in your pro-
duction process.
References
We have engineered and overseen the con-
struction of biomass cogeneration plants
for, among others:
– Holzbearbeitung Bralitz GmbH,
– Robeta Holz OHG Milmersdorf,
– elbstrom AG Aschersleben and
– Holzindustrie Templin GmbH.
3 Biomass CHP in Milmersdorf.
4 CHP fl ue gas treatment in Aschers-
leben. Photos: Fraunhofer IFF
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