| Cofiring of wood cocombustion | |
Abstract/OtherAbstract
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VTT Symposium 208. Nordic Treasure Hunt. Extracting Energy from Forest Residues. Jyväskylä, 30th August 2000. Alakangas, Eija (ed.), 87 - 105, The objective of this study was to determine safe combustion conditions in circulating and bubbling fluidised-bed boilers for wood chips produced by different forest harvesting chains. The optimal mixing ratios for typical and commonly used forest chip qualities, as well as for mixtures of chips and other fuels, under steam temperatures typical of circulating and bubbling fluidised-bed boilers are also determined. Emissions are also reviewed. The combustion and co-firing properties of fuels produced by different forest chains, and their suitability were studied first in VTT's test facilities and later in industrial-scale power plant boilers. The formation of alkaline and chlorine compounds and their effect on boiler fouling were studied by deposit probes in the test facilities. Deposits and phase changes in their compounds and corrosion risks are analysed by SEM-EDX. Utilisation of logging residue chips can cause deposition on heat exchanger surfaces and corrosion due to chlorine of wood ash. The harmful formation of alkaline and chlorine compounds on boiler surfaces could be prevented by co-firing sulphur-containing fuel., The objective of this study was to determine safe combustion conditions in circulating and bubbling fluidised-bed boilers for wood chips produced by different forest harvesting chains. The optimal mixing ratios for typical and commonly used forest chip qualities, as well as for mixtures of chips and other fuels, under steam temperatures typical of circulating and bubbling fluidised-bed boilers are also determined. Emissions are also reviewed. The combustion and co-firing properties of fuels produced by different forest chains, and their suitability were studied first in VTT's test facilities and later in industrial-scale power plant boilers. The formation of alkaline and chlorine compounds and their effect on boiler fouling were studied by deposit probes in the test facilities. Deposits and phase changes in their compounds and corrosion risks are analysed by SEM-EDX. Utilisation of logging residue chips can cause deposition on heat exchanger surfaces and corrosion due to chlorine of wood ash. The harmful formation of alkaline and chlorine compounds on boiler surfaces could be prevented by co-firing sulphur-containing fuel. |
Authors
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Orjala, Markku, Ingalsuo, Riikka, Patrikainen, Tapio, Mäkipää, Martti, Hämäläinen, Jouni |
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Publication Detail
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Publisher : VTT Energy Type : text Format : application/pdf |
Date Detail
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2001 |
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Copyright Information
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Copyright VTT Technical Research Centre of Finland. Full text may not be reproduced, republished, stored, distributed, transmitted, altered or resold except as follows: Full text may be downloaded, held and displayed for private study or research and single copies may be printed out for private study or research. In all citations the source and the copyright holder must be acknowledged. The documents are provided "as is" and "as available" basis. No warranty of kind, either express or implied including but not limited to warranties of title or non-infringement or implied warranties of merchantability or fitness for a particular purpose, is made in relation to the availability, accuracy, reliabi lity or content of these pages. |
Other Details
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Languages : eng |
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