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You can find the research projects until the 12/31/2016 in the energy research database and
research projects as of 01/01/2017 in the ARAMIS database.

Publication Number: 270069
Title of publication: Thermische Nutzung von anspruchsvollen Biomassebrennstoffen - Versuche Herbst 2006 - Schlussbericht (Thermische Nutzung von anspruchsvollen Biomassebrennstoffen - Versuche Herbst 2006 - Schlussbericht )
Program: Biomass and wood energy
Project: 100973 - Versuche zum Emissions- und Betriebsverhalten verschiedener Biomasse
Display all publications for this project     Description of ARAMIS project
Date of publication: 30.10.2007
Contractor: Verenum | Langmauerstrasse 109 | 8006 Zürich
Umwelt & Energie | 8933 Maschwanden
Ingenieurbüro Hersener | Untere Frohbergstrasse 1 | 8542 Wiesendangen
ardens GmbH | Munzachstrasse 38 | 4410 Liestal
Authors: Ruedi Bühler | Umwelt & Energie
Jean-Louis Hersener | Ingenieurbüro Hersener | hersener@agrenum.ch
Andres Jenni | ardens GmbH
Dr. Norbert Klippel | Verenum | Langmauerstrasse 109 | 8006 Zürich
Available Documents: 000000270069 ( de, 1659 kb )
Abstract: Renewable energy should be further enhanced. Besides wood also other biomass can be used, e.g. agricultural waste. Clean and reliable combustion of these waste materials is more difficult to achieve than with wood. As continuation of the test performed in 2005 at the plant of Villiger (Description of the plant in [1]), further test with challenging biomass were planned for 2006. For different reasons, only part of the anticipated test program could be accomplished. In November and December 2006 tests with the fuel mixtures «sedge + chipped wood» and «horse manure + sedge + chipped wood» were conducted. The tests show that with optimal conditions, these fuel mixtures can be used as biomass fuel, leading to low emissions and neglect able slagging. But stable combustion conditions very difficult to achieve. Automatic control alone was not sufficient for stable combustion conditions. Manual intervention (repeated adjustment of the control parameters) was necessary. Nevertheless, burning of holes in the combustion bed and insufficient cover of the grate could not always be avoided. In addition, manual intervention in the feeding and mixing devices was necessary.
Therefore the planned unattended duration test of several days was not possible. The conclusions of the tests are:
– For continuous operation, the automatic control system of the wood boiler has to balance the fluctuations in combustion conditions. This is only possible in a limited range. If one wants to add challenging biomass as described above to woody biomass in a wood boiler, and operate the plant unattended, then maximum ¼ of this material can be added.
– Thereby, the following conditions have to be fulfilled:
• Mixing of the fuel must not decrease the size of the woodchips. The size of the woodchips preferably should be of P63 and maintain this size up to the grate. Mixing with the mixing trolley used in the test is not applicable. Another solution could be to charge the two different fuels in intervals and spread it equally in the silo.
• The transport systems have to appropriate to the special shape of the fuel
• The mixing of the fuel components has to be designed that bridging is avoided. A mixing system, which operates on a volumetric basis, is not applicable. A possible solution could be to define the mixing ration on weight basis.
– As regards the application of an electrical precipitator, the test showed that many questions are still open, also for applications for woody biomass. To answer these questions, further systematic investigations are necessary.

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