| 用高露点空气干燥小木块时挥发性有机物的释放 |
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| 引用本文： | IngeJohansson,biasKarlsson,landWimmerstedt. 用高露点空气干燥小木块时挥发性有机物的释放[J]. 中国化学工程学报, 2004, 12(6): 767-772 |
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| 作者姓名： | IngeJohansson biasKarlsson landWimmerstedt |
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| 作者单位： | S.E.P. Scandinavian Energy Project AB Bror Nilssons g. 16，SE-417 55 Goteborg，Sweden，Thurne Teknik AB Heliosvagen 1 b，SE-120 30 STOCKHOLM，Sweden，Chemical Engineering Lund University，P.O. Box 124，SE-221 00 LUND，Sweden |
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| 基金项目： | SupportedpartlybytheEuropeanUnionBrite/EuRamProgramwithintheframeworkoftheParbotechProjectandpartlybytheVarmeforskBiofuelDryingResearchProgram. |
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| 摘 要： | Emission of volatile organic compounds (VOCs) during drying of wood particles for particleboard manufacture, or for production of refined biofuels, is a potential environmental problem. The aim of this work is to study the emissions of VOCs during drying, and the influence on the emissions by different drying parameters. The experiments have mainly been done in a batch fluidized bed dryer, but measurements have also been done in a, pilot scale, continuous fluidized bed dryer. The parameters studied are air flow rate through the bed, air temperature, air dewpoint, and bed height. Since the present trend in biofuels and particle drying is towards very high dewpoints during drying, some measurements have been made at dewpoints up to 95℃, corresponding to a water content of 3.2 kg water per kilogram dry air. The emissions have been measured in two different ways, online during drying with a flame ionization detector and through wood analyses of the terpene content in the wood particles before and after dryi
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| 关 键 词： | 高露点空气 干燥 小木块 挥发性有机物 木材加工 |
| 修稿时间： | |
Volatile Organic Compound Emissions when Drying Wood Particles at High Dewpoints |
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| IngeJohansson,biasKarlsson,landWimmerstedt. Volatile Organic Compound Emissions when Drying Wood Particles at High Dewpoints[J]. Chinese Journal of Chemical Engineering, 2004, 12(6): 767-772 |
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| Authors: | IngeJohansson biasKarlsson landWimmerstedt |
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| Affiliation: | S.E.P. Scandinavian Energy Project AB,Bror Nilssonsg.16, SE-41755 Goeteborg, Sweden Thurne TeknikAB, Heliosvaegen1b, SE-12030 STOCKHOLM, Sweden Chemical Engineering, LundUniversity, P.O.Box124, SE-22100LUND, Sweden |
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| Abstract: | Emission of volatile organic compounds (VOCs) during drying of wood particles for particleboard manufacture, or for production of refined biofuels, is a potential environmental problem. The aim of this work is to study the emissions of VOCs during drying, and the influence on the emissions by different drying parameters.The experiments have mainly been done in a batch fluidized bed dryer, but measurements have also been done in a, pilot scale, continuous fluidized bed dryer. The parameters studied are air flow rate through the bed, air temperature, air dewpoint, and bed height. Since the present trend in biofuels and particle drying is towards very high dewpoints during drying, some measurements have been made at dewpoints up to 95℃, corresponding to a water content of 3.2 kg water per kilogram dry air. The emissions have been measured in two different ways,online during drying with a flame ionization detector and through wood analyses of the terpene content in the wood particles before and after drying. Substantial work has been made in developing the latter method as well as developing the drying equipment to be able to produce a wide range of conditions of the drying medium. It was shown that the VOCs emitted, during wood particle drying, mainly consist of terpenes. The behavior of the emissions was typical, at first contact with the drying gas a sharp peak in the release rate was detected. After that,the release rate stabilizes and declines slowly to a point where the material temperature increases and results in a second small peak in the release rate. Typically 80%-90% of the initial terpene content in the material was emitted during drying to low moisture content and it is not possible to significantly influence this release by changing the drying conditions. Up to 50% of the emitted terpenes are released during a very short period after contact with the drying medium. This fact could be utilized by employing a 2-step drying process. The fact that the VOC concentration in the inert gas gets much higher when drying at higher dewpoints could be taken into consideration when dealing with closed loop applications where the inert gas after the dryer is burnt. |
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| Keywords: | drying biofuels particleboard volatile organic compound high dewpoints |
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