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首页> 外文会议>Twenty-Fifth Annual International Conference on Incineration and Thermal Technologies(IT3) 2006 vol.1 >Emission Characteristics of Mercury from Waste Combustion Facilities
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Emission Characteristics of Mercury from Waste Combustion Facilities

机译：废物燃烧设施中汞的排放特性

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Emission sampling and analysis of mercury at inlet and outlet of air pollution control devices (APCDs) have been conducted to provide information on mercury speciation, mass distribution and removal. Two municipal waste incinerators and two industrial waste incinerators, each with dry and wet types of APCDs, and two cement kilns were selected to measure mercury concentrations mainly at stacks, as well as selected locations between the APCDs. Gaseous sampling was implemented in accordance with the Ontario Hydro (OH) method to determine whether mercury forms were elemental or oxidized. Mercury removal efficiencies were relatively higher with more than 70% due to tight APCDs configuration. Oxidized mercury was dominant in municipal solid waste incinerators. Due to high collection of particles by filters, higher mercury removal efficiency was observed at the incinerator with dry type APCDs. Such behavior was confirmed by the results of mass distribution of mercury, which showed most of mercury in fly ash in case of the incinerator with dry type APCDs. By passing through the APCDs, the portion of the oxidized form of mercury seemed to increase in most cases because of increased contact time with the flue gas and fly ash and/or enhancing the mercury oxidation rate by acidic gas components. The mercury removal efficiencies in the industrial waste incinerators in this investigation were lower than those in the municipal waste incinerators due to less tight APCDs configuration, and because the speciation and fate of mercury between two types of APCDs (wet and dry) were quite different. In wet type APCDs, the oxidized mercury was removed by absorption to water at the scrubber since Hg~(2+) is soluble in water.
机译：已经进行了空气污染控制装置（APCD）进口和出口的汞排放采样和分析，以提供有关汞形态，质量分布和清除的信息。选择了两个分别具有干式和湿式APCD的市政垃圾焚化炉和两个工业垃圾焚化炉，以及两个水泥窑来主要测量烟囱中以及APCD之间选定位置的汞浓度。根据安大略水电（OH）方法进行气态采样，以确定汞形式是元素形式还是氧化形式。由于紧密的APCD配置，除汞效率相对较高，达到70％以上。氧化汞在城市固体废物焚化炉中占主导地位。由于通过过滤器收集的颗粒很高，在干式APCD的焚化炉中观察到了更高的除汞效率。汞的质量分布结果证实了这种行为，在使用干式APCD的焚烧炉中，汞的质量分布显示了粉煤灰中的大部分汞。在大多数情况下，通过APCD后，汞的氧化形式的一部分似乎增加了，这是因为与烟气和粉煤灰的接触时间增加和/或通过酸性气体成分提高了汞的氧化速率。由于APCD的配置不严格，并且两种APCD（湿式和干式）之间的汞形态和结局大不相同，因此本次调查中工业垃圾焚化炉的除汞效率低于市政垃圾焚化炉。在湿式APCD中，由于Hg〜（2+）可溶于水，因此在洗涤塔中吸收到水中可除去氧化的汞。

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