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Experimental Study of Dioxin Formation and Emissions from Power Boilers Burning Salt- Laden Wood Waste

机译：燃烧含盐木材废物的动力锅炉中二恶英的形成和排放的实验研究

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Dioxins (PCDDs) and furans (PCDFs) are groups of substances known to be toxic. The Canada Wide Standard (CWS) has set a stack emission limit of 0.1 and 0.5 ng TEQ/m~3, respectively, for new and existing facilities. To help the affected Canadian mills meet these limits, an extensive research project was carried out between 2000 and 2003. The investigations involved experimental and survey studies on nine full-scale power boilers. This report presents the survey results obtained from eight coastal mill boilers and one interior boiler. In addition to stack PCDD/F emissions, many other stack emissions and ash analyses were also tested.A total of 112 stack dioxin tests were reported. Dioxin emissions varied significantly between individual tests on a given boiler and between boilers at different pulp mills. Stack dioxin emissions for the power boiler at the interior mill are 2 to 3 orders of magnitude lower than typical emissions from a coastal mill. However, a lower hog salt content does not mean lower dioxin formation and emissions. The average emission levels tested in 2002 were generally lower than those tested in the previous two years. Measures taken to control PCDD/F emissions include improved boiler operations, minimized gas/oil firing, adding coal and TDF, and successful trials of other dioxin control techniques.
机译：二恶英（PCDDs）和呋喃（PCDFs）是已知有毒的物质。加拿大标准（CWS）已将新设施和现有设施的烟囱排放极限分别设置为0.1和0.5 ng TEQ / m〜3。为了帮助受影响的加拿大工厂达到这些限制，在2000年至2003年之间进行了广泛的研究项目。调查涉及对9台大型电锅炉的实验和调查研究。本报告介绍了从八台沿海工厂锅炉和一台室内锅炉获得的调查结果。除烟囱PCDD / F排放外，还测试了许多其他烟囱排放和灰分分析。 总共报告了112堆二恶英测试。在给定锅炉的各个测试之间以及不同纸浆厂的锅炉之间，二恶英的排放量差异很大。内部工厂的动力锅炉烟囱二恶英排放量比沿海工厂的典型排放量低2至3个数量级。但是，较低的生猪盐含量并不意味着较低的二恶英形成和排放。 2002年测试的平均排放水平通常低于前两年的测试水平。控制PCDD / F排放所采取的措施包括改善锅炉运行，减少燃气/燃油燃烧，添加煤和TDF，以及其他二恶英控制技术的成功试验。

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