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首页> 外文会议>International Conference on Fluidized Bed Combustion; 20050522-25; Toronto(CA) >Trace Organic Pollutants Emission from Large-scale Circulating Fluidized Bed Incinerators of Co-firing Chinese MSW and Coal
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Trace Organic Pollutants Emission from Large-scale Circulating Fluidized Bed Incinerators of Co-firing Chinese MSW and Coal

机译：中国城市生活垃圾与煤共烧大型循环流化床焚烧炉中微量有机污染物排放

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摘要

Complex components, high moisture and low caloric value of raw Chinese MSW (Municipal Solid Waste) lead to the difficulties of keeping stable burning and low pollutant emission. Differential Density Circulated Fluidized Bed (DDCFB) incinerator was first developed by Zhejiang University to overcome such difficulties. The research of organic pollutants, especially dioxins and polycyclic aromatic hydrocarbons emission and control from MSW incinerators has been carried out in ITPE since 1998. The aim of this paper is to provide the scheme of a new co-firing CFB incineration technology, and useful data for environmental evaluation of trace organic pollutants emission from incinerators. The art of co-firing CFB is presented briefly in the first part of this paper. The dioxin content in original Chinese MSW is estimated to be 10 pg I-TEQ/g based on the data from Abad et al. Several test runs are conducted in a real-scale (150ton/day) incinerator co-firing MSW and coal to investigate dioxins and polycyclic aromatic hydrocarbons emission to ambient air. Test results show that dioxins input into the incinerator is estimated around 300～600 mg I-TEQ/y, dioxins output is estimated 3～100 mg I-TEQ/y, and dioxins emitted to ambient air is around 0.1～15mg I-TEQ/y. It seemed that most of dioxins in original waste are decomposed by incineration process. For seventeen priority PAHs, its emission to ambient air is around 200～4160g/y for co-firing runs, which is much more than 80g/y for coal combustion only. This suggests that PAHs emission to ambient air needed to be more concerned than dioxins. That is to say, PAHs emission regulatory should be proposed as soon as possible to restrict all incinerators. Several new incinerators (200 tons/day per unit and 300 tons/day per unit) were built by using new Co-firing CFB technology in past few years. From the environmental evaluation report, dioxins emission in stack gas is in range of 0.0025～0.06 ng I-TEQ/Nm~3, which seemed far below the European limit. The annual dioxin emission to air for 200ton/day or 300 t/d units is around 3～6 mg I-TEQ. It shows that co-firing CFB incinerator is capable of reducing dioxin emission effectively. Based on industrial demonstration experience of new co-firing CFB incineration technology, it has been proven environmental friendly method for thermal treatment of MSW in developing countries. Some reasons for low dioxin emission of co-firing processes are discussed in this paper.
机译：中国城市生活垃圾（MSW）的复杂成分，高水分和低热量导致难以保持稳定燃烧和低污染物排放。差密度循环流化床（DDCFB）焚化炉是浙江大学为克服这些困难而首先开发的。自1998年以来，ITPE一直在进行有机污染物（特别是二恶英和多环芳烃）在ITPE中的排放和控制的研究。用于焚化炉中痕量有机污染物排放的环境评估。本文的第一部分简要介绍了CFB的共烧技术。根据Abad等人的数据，原始中国城市生活垃圾中的二恶英含量估计为10 pg I-TEQ / g。在真实规模（150吨/天）的焚化炉中，将城市固体废弃物和煤共烧，进行了几次试验，以研究二恶英和多环芳烃向环境空气的排放。测试结果表明，焚烧炉中二恶英的输入量约为300〜600 mg I-TEQ / y，二恶英的输出量约为3〜100 mg I-TEQ / y，向大气中排放的二恶英约为0.1〜15mg I-TEQ。 / y。看起来原始废物中的大多数二恶英都通过焚烧过程分解。对于17个优先PAHs，共燃运行时其向周围空气的排放约为200〜4160g / y，仅燃煤时就超过80g / y。这表明与二恶英相比，PAHs向环境空气的排放需要更加关注。也就是说，应尽快提出PAHs排放法规，以限制所有焚烧炉。在过去的几年中，使用新的共烧CFB技术建造了几台新的焚化炉（每台200吨/天和300吨/天）。根据环境评估报告，烟道气中二恶英的排放量在0.0025〜0.06 ng I-TEQ / Nm〜3的范围内，远远低于欧洲的限值。 200吨/天或300 t / d单位的年二恶英空气排放量约为3〜6 mg I-TEQ。结果表明，CFB焚烧炉能够有效减少二恶英排放。基于新的联合燃烧CFB焚烧技术的工业示范经验，它已被证明是发展中国家对MSW进行热处理的环保方法。本文讨论了共烧过程中二恶英排放较低的一些原因。

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