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Cocurrent Combustion of Human Feces and Polyethylene Waste

机译：人粪和聚乙烯废物的同时燃烧

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摘要

Given the large volume of waste generated each year, its associated environmental impact and the difficulties of their destination, especially hazardous waste, controlled combustion can provide a solution to the problem. Among hazardous waste, plastics, specifically polyethylene and human fecal waste stand out. However, a detailed study is necessary of the combustion process of such waste, as well as the influence of operating variables on these. The present work deals with two analyses: the cocombustion of polyethylene waste and charcoal; and the combustion of human feces. In both cases the stability of the combustion front, and the main chemical species formed during its propagation are analyzed. The experiments were carried out in a fixed bed reactor fully instrumented, under co-current configuration. The ignition source is a radiative flux of 30 kW m~(-2). During front propagation, the temperature levels are considerably high. For polyethylene with higher heating value of 48 MJ kg"1, volatile-matter content of 98.7 wt%, and moisture of 0.2 wt%, the temperatures average levels of cocombustion with charcoal are considerably higher ～925 ℃. In the case of fecal samples, the higher heating value is 23 MJ kg~(-1), the volatile-matter content is 40 wt%, and moisture is 11.6 wt%. For this characteristic, the average temperature levels are considerably higher, ～885 ℃. Higher shrinkage rate decreases the front velocity (mix case: from 2.18 to 0.72 mm min~(-1)) unlike to lower shrinkage rate (feces case: from 1.39 to 2.05 mm min~(-1)). The high concentration of CO for both materials (7.92 % for feces and 7.42 % for the mix) may be due to gasification reactions (incomplete combustion) in the bed. The presence of H_2 in considerable fractions (4.4 % for feces, and 3.1 % for the mix) reinforces this hypothesis. The global results are encouraging, since all residues showed potential for energetic use. Especially feces that are residues utterly scorned, and its energetic power totally disregarded.
机译：考虑到每年产生的大量废物，与之相关的环境影响以及目的地的困难，特别是危险废物，受控燃烧可以为解决这一问题提供解决方案。在危险废物中，塑料，特别是聚乙烯和人类粪便废物突出。但是，有必要对此类废物的燃烧过程以及操作变量对这些废物的影响进行详细研究。目前的工作涉及两个分析：聚乙烯废料和木炭的共燃烧；以及和人类粪便的燃烧。在这两种情况下，都对燃烧前沿的稳定性以及在其传播过程中形成的主要化学物质进行了分析。在并流配置下，在配备齐全的固定床反应器中进行实验。点火源是30 kW m〜（-2）的辐射通量。在正面传播期间，温度水平相当高。对于具有48 MJ kg“ 1的较高热值，98.7 wt％的挥发物含量和0.2 wt％的水分的聚乙烯，与木炭共燃的平均温度水平要高得多，约为925℃。 ，较高的发热量为23 MJ kg〜（-1），挥发物含量为40 wt％，水分为11.6 wt％，因此平均温度水平较高，约为885℃。收缩率降低（收缩率：1.39 mm min〜（-1）从1.39降低到2.05 mm min〜（-1）），与低收缩率不同（混合情况：从2.18降至0.72 mm min〜（-1））。材料（粪便为7.92％，混合物为7.42％）可能是由于床中的气化反应（不完全燃烧）引起的，H_2的大量存在（粪便为4.4％，混合物为3.1％）强化了这一假设。总体结果令人鼓舞，因为所有残留物都显示出了高能使用的潜力。残渣被完全轻蔑了，它的活力完全被忽略了。

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  • 来源
    《Waste and biomass valorization》 |2015年第3期|425-432|共8页
  • 作者

    F. A. F. Monhol; M. F. Martins;

  • 作者单位

    Department of Mechanical Engineering, Thermal Machines Laboratory, Federal Institute of Espirito Santo - IFES, Sao Mateus-ES, Brazil;

    Department of Postgraduate Studies in Mechanical Engineering, Laboratory of Combustion and Combustible Matter (LCC), Federal University of Espirito Santo, Vitoria-ES, Brazil;

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  • 正文语种 eng
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  • 关键词

    Feces; Polyethylene; Hazardous waste; Combustion; Self-sustaining;

    机译：屎;聚乙烯危险废物;燃烧;自我维持;

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