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首页> 外文期刊>Fuel >Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas
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Temperature programmed decomposition desorption of the mercury species over spent iron-based sorbents for mercury removal from coal derived fuel gas

机译：在废铁基吸附剂上对汞物质进行程序升温分解解吸，以从煤制燃料气中去除汞

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Development of an elemental mercury (Hg~0) removal process for coal derived fuel gas is an important issue in the development of a clean and highly efficient coal power generation system. Recently, iron-based sorbents such as iron oxide (Fe_2O_3), supported iron oxide on TiO_2, and iron disulfide have been proposed as active mercury sorbents. It was supposed that Hg° reacted with H2S on the iron-based sorbents and captured mercury. However, the mercury species captured on the sorbents have not been directly characterized yet. The captured mercury species was too small to identify because the concentration of Hg° was very low (ppb order). In this study, a temperature programmed decomposition technique is applied in order to understand the decomposition character of the mercury species captured on iron-based sorbents. The Hg~0 removal experiments were carried out in a laboratory-scale fixed-bed reactor at 80 ℃ using simulated fuel gas. After the Hg° removal experiments, desorption of the captured mercury species was carried out in the same fixed-bed reactor using an atomic absorption spectrophotometer. Temperature programmed decomposition desorption (TPDD) experiments revealed that the decomposition characteristic of mercury species captured on the sorbent was similar to that of HgS reagents (cinnabar and meta-cinnabar). Furthermore, it was observed that the characteristics of the decomposition of mercury species depended on the sorbent type of sorbents and reaction conditions.
机译：开发用于煤制燃料气的除汞（Hg〜0）工艺是开发清洁高效的煤炭发电系统的重要问题。近来，已提出诸如氧化铁（Fe_2O_3），TiO_2上负载的氧化铁和二硫化铁之类的铁基吸附剂作为活性汞吸附剂。据推测，Hg°在铁基吸附剂上与H2S反应并捕获了汞。但是，尚未直接表征吸附剂上捕获的汞种类。捕获的汞种类太小而无法识别，因为Hg°的浓度非常低（ppb级）。在这项研究中，为了了解在铁基吸附剂上捕获的汞种类的分解特性，应用了程序升温分解技术。在实验室规模的固定床反应器中于80℃下使用模拟燃料气进行Hg〜0去除实验。在去除汞的实验之后，使用原子吸收分光光度计在同一固定床反应器中对捕获的汞进行解吸。程序升温分解脱附（TPDD）实验表明，吸附剂上捕获的汞物种的分解特性与HgS试剂（朱砂和间朱砂）相似。此外，观察到汞种类的分解特性取决于吸附剂的吸附剂类型和反应条件。

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