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Process-Based Control of HAPs Emissions from Drying Wood Flakes

机译:干燥木片中基于过程的HAP排放控制

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摘要

Industrial wood flake drying generates methanol,formaldehyde,and other hazardous air pollutants (HAPs).A simple theoretical model shows that particles smaller than 400 mu m will begin to thermally degrade and release disproportionately large quantities of HAPs.This is confirmed in full-scale practice where particles smaller than 500 mu m show visible signs of charring.Laboratory measurement of the activation energy for the breakdown of wood tissue into methanol and formaldehyde led to a value of about 17 kcal/mol.The apparent activation energy measured in the field was higher.This result was obtained under nonisothermal conditions and is biased high by the fines fraction of the furnish,which is exposed to elevated temperatures.It is proposed that a combination of screening out the fines fraction smaller than 500 mu m and reducing the dryer inlettemperature will substantially reduce emissions,possibly to the point where control devices can be downsized or eliminated.Our findings allow these HAPs reductions to be semiquantitatively estimated.
机译:工业木材薄片干燥会产生甲醇,甲醛和其他有害空气污染物(HAP)。一个简单的理论模型表明,小于400微米的颗粒将开始热降解并大量释放不成比例的HAP。小于500微米的颗粒表现出明显的炭化迹象。实验室测量将木质组织分解为甲醇和甲醛的活化能约为17 kcal / mol。在现场测得的表观活化能为该结果是在非等温条件下获得的,并且由于暴露在高温下的配料细粉部分而偏向较高。建议结合使用筛选出小于500微米的细粉部分并降低干燥机入口温度的组合。将大大减少排放量,甚至可以减少控制设备的尺寸。这些HAP减少量将进行半定量估算。

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  • 来源
    《Environmental Science & Technology》 |2006年第7期|p.2438-2441|共4页
  • 作者单位

    Institute of Paper Science and Technology and School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,500 Tenth Street NW,Atlanta,Georgia 30332;

    Institute of Paper Science and Technology and School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,500 Tenth Street NW,Atlanta,Georgia 30332;

    Institute of Paper Science and Technology and School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,500 Tenth Street NW,Atlanta,Georgia 30332;

    Institute of Paper Science and Technology and School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,500 Tenth Street NW,Atlanta,Georgia 30332;

    Institute of Paper Science and Technology and School of Chemical and Biomolecular Engineering,Georgia Institute of Technology,500 Tenth Street NW,Atlanta,Georgia 30332;

    Georgia-Pacific Corporation,P.O.Box 105605,Atlanta,Georgia 30348;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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