ECN publication
Operationele testen circulerend-wervelbedvergasser voor biomassa
Published by: Publication date:
ECN 1-9-1998
ECN report number: Document type:
ECN-C--98-075 ECN publication
Number of pages: Full text:
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Gasification tests with shredded meranti and willow have been performedin order to determine the operational aspects of the circulating fluidised bed gasifier (Dutch abbreviation is BIVKIN) at ECN. The start-up procedure has been formalised. It appeared that the transition from combustion to gasification is very straightforward. An instantaneous increase of the amount of fuel leads to stable gasification conditions within minutes. The shutdown procedure however is also simple but more risky due to the possibility of large temperature rise during the transition from gasification to combustion. During 'cold' tests, sand wear occurred due to the high volume flow needed to achieve the desired gas velocity at low temperature. No substantial sand wear was observed under gasification conditions. The feed system appeared to be rather susceptible for the size of the fuel that was used. Larger particles seemed more difficult to feed. Larger fuel particles gave rise to a higher carbon conversion (>90%). The influence of dolomite and steam on the amount of tar in the fuel gas is still uncertain due to the limited number of samples and the uncertainty in the tar analysis method. The measured caloric value of the fuel gas was mainly caused by the higher moisture content of the willow. The geometry of the recirculation system appeared to be the limiting factor for the maximal capacity. It is expected that adaption of the recirculating system will result in a higher maximal capacity of the installation. This adaptation however is not really necessary for scaling predictions. 16 refs.

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