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Nano-Structured Sorbent Injection Strategies for Heavy Metal Capture in Combustion Exhausts

机译:用于燃烧废气中重金属捕集的纳米结构吸附剂注入策略

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摘要

Nano-structured sorbent injection is a promising technique for heavy metal capture in combustion systems. The importance of sorbent injection strategies, including the form of the sorbent and its injection location for metal capture and removal is investigated in this study. A multi-component tri-modal aerosol dynamic model was employed to understand the evolution of heavy metals and sorbents, as well as their interactions in the incineration system. Experiments were conducted to assess the performance of in-situ generated SiO2, compared with bulk Ti-PICL sorbent, in capturing lead and cadmium from a demilitarization incineration system. Nano-structured SiO2 generated in-situ was found to be more efficient than the bulk Ti-PICL sorbent because it offers a higher external surface area for condensation. The sorbent injection location is important as it affects the physical properties of the sorbent and the pathway for heavy metal capture. Extensive sintering and reduction in the surface area were observed when sorbent was injected into high temperature flue gas, i.e., directly into the combustor. However, when injected into much lower temperature flue gas, the pathway for heavy metal capture was altered from condensation to inter-particle coagulation due to the nucleation of heavy metal species. This study further revealed that new emission standards can be readily met with an optimal sorbent injection strategy.
机译:纳米结构的吸附剂注入是一种用于燃烧系统中重金属捕获的有前途的技术。在这项研究中,研究了吸附剂注入策略的重要性,包括吸附剂的形式及其注入位置对于金属捕获和去除的重要性。采用多组分三峰气溶胶动力学模型来了解重金属和吸附剂的演变以及它们在焚烧系统中的相互作用。进行了实验,以评估原位生成的SiO 2 与散装Ti-PICL吸附剂相比,从非军事化焚烧系统中捕获铅和镉的性能。发现就地生成的纳米结构SiO 2 比整体Ti-PICL吸附剂更有效,因为它提供了更大的冷凝表面积。吸附剂的注入位置很重要,因为它会影响吸附剂的物理特性以及重金属捕获的途径。当将吸附剂注入高温烟道气,即直接注入燃烧室时,观察到大量的烧结和表面积的减少。但是,当注入温度较低的烟道气中时,由于重金属物质的成核作用,重金属捕获的路径从冷凝变为颗粒间凝结。这项研究进一步表明,最佳的吸附剂注入策略可以轻松满足新的排放标准。

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  • 来源
    《Aerosol Science and Technology》 |2010年第8期|p.676-691|共16页
  • 作者

    Achariya Suriyawong;

  • 作者单位

    Aerosol and Air Quality Research Laboratory, Department of Energy, Environmental and Chemical Engineering Washington University in St. Louis, St. Louis, MO, USA National Center of Excellence for Environmental and Hazardous Waste Management, Chulalongkorn;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2022-08-18 00:57:41

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