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首页> 外文期刊>Journal of the Air & Waste Management Association >Assessment of emissions and removal of poly chlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) at start-up periods in a hazardous waste incinerator
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Assessment of emissions and removal of poly chlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) at start-up periods in a hazardous waste incinerator

机译：在危险废物焚化炉启动阶段评估多氯二苯并对二恶英和二苯并呋喃（PCDD / Fs）的排放和清除

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摘要

A study was conducted to observe the changes in polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/F) levels and congener profiles in the flue gas of a hazardous waste incinerator during two start-up periods. Flue gas samplings were performed simultaneously through Air Pollution Control Devices (APCDs) (including boiler outlet, electrostatic precipitator (ESP) outlet, wet scrubbers (WS) outlet, and activated carbon (AC) filter outlet) in different combustion temperatures during a planned cold (long) start-up and an unplanned warm (short) start-up. The results showed that PCDD/F concentrations could be elevated during the start-up periods up to levels 3-4 times higher than those observed in the normal operation. Especially lower combustion temperatures in the short start-ups may cause high PCDD/F concentrations in the raw flue gas. Assessment of combustion temperatures and Furans/Dioxins values indicated that surface-catalyzed de novo synthesis was the dominant pathway in the formation of PCDD/Fs in the combustion units. PCDD/F removal efficiencies of Air Pollution Control Devices suggested that formation by de novo synthesis existed in ESP also when in operation, leading to increase of gaseous phase PCDD/Fs in ESP. Particle-bound PCDD/Fs were removed mainly by ESP and WS, while gaseous phase PCDD/Fs were removed by WS, and more efficiently by AC filter.
机译：进行了一项研究，以观察危险废物焚烧炉在两个启动阶段中多氯二苯并-对-二恶英和多氯二苯并呋喃（PCDD / F）的水平以及同类物的变化。在计划的寒冷期间，通过空气污染控制设备（APCD）（包括锅炉出口，静电除尘器（ESP）出口，湿式洗涤塔（WS）出口和活性炭（AC）过滤器出口）同时进行烟气采样。 （长）启动和计划外的暖（短）启动。结果表明，在启动期间，PCDD / F的浓度可以提高到正常运行中观察到的3-4倍。特别是在短启动阶段较低的燃烧温度可能会导致原始烟道气中PCDD / F浓度升高。燃烧温度和呋喃/二恶英值的评估表明，表面催化的从头合成是燃烧单元中PCDD / Fs形成的主要途径。空气污染控制装置的PCDD / F去除效率表明，在运行中ESP中也存在从头合成的形成，从而导致ESP中的气相PCDD / Fs增加。颗粒结合的PCDD / Fs主要通过ESP和WS去除，而气相PCDD / Fs通过WS去除，并且通过AC过滤器更有效。

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