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首页> 外文期刊>ISIJ international >Observation of Behavior of Dioxins and Some Relating Elements in Iron Ore Sintering Bed by Quenching Pot Test
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Observation of Behavior of Dioxins and Some Relating Elements in Iron Ore Sintering Bed by Quenching Pot Test

机译：淬火锅法观察铁矿石烧结床中二恶英及其相关元素的行为

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摘要

Understanding of the formation mechanism of dioxins in the sintering bed is of importance in developing countermeasures to reduce the emission of dioxins from sintering plants. This research has clarified the behavior and the possible mechanism of dioxin formation and the relation to Cl and Cu components in the sintering bed by conducting a series of quenching tests utilizing sintering pots. The progress of flame front was quenched by terminating the air supply, then introducing N_2 gas in the reverse direction when the sintering process progressed halfway through the test pots, specifically to the position of the thermocouples. The primary specimens were obtained from the raw mixture zone situated beneath the combustion interface for chemical analysis. Concentrations of dioxins, Cl and Cu were found at the depth of 10-20 mm beneath the combustion interface in raw mixture zone. This was considered to be the site of dioxin synthesis. Slight increase of dioxins in the wet zone was related to dioxin vaporizing from the site of the synthesis, then to be trapped in this zone. Significant amounts of dioxins escaping into the outlet gas at and after burn through point could be explained by both the releasing of trapped dioxins and the acceleration of the synthesizing process attributable to the increased concentration of Cl and Cu.
机译：了解烧结床中二恶英的形成机理对于制定减少烧结厂二恶英排放的对策很重要。这项研究通过使用烧结罐进行一系列淬火试验，弄清了二恶英形成的行为和可能的机理，以及与烧结床中Cl和Cu成分的关系。通过终止空气供应来猝灭火焰前移的进程，然后在烧结过程中途通过测试罐（具体到热电偶的位置）时，以相反的方向引入N_2气体。原始样品是从位于燃烧界面下方的原始混合区获得的，用于化学分析。在原始混合区中燃烧界面下方10-20 mm的深度处发现了二恶英，Cl和Cu的浓度。这被认为是二恶英合成的位点。湿区中二恶英的轻微增加与二恶英从合成位点蒸发有关，然后被困在该区中。在燃烧通过点和燃烧点之后，大量的二恶英会逸出到出口气体中，这既可以通过释放捕获的二恶英，又可以通过增加Cl和Cu的浓度来加快合成过程来解释。

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