Conversion of microwave pyrolysed ASR's char using high temperature agents
Conversion of microwave pyrolysed ASR's char using high temperature agents
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DOI：
10.1016/j.jhazmat.2010.09.056
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发表时间：
2011-01-15
影响因子：
13.6
通讯作者：
Forsgren, Christer
中科院分区：
文献类型：
--
作者：
Donaj, Pawel;Blasiak, Wlodzimierz;Forsgren, Christer
热解能够从废物聚集体中回收金属和有机原料，例如：汽车切碎机残渣（ASR）。ASR及其热解固体产物是一种形态和化学变化的混合物，含有矿物材料，包括危险的重金属。这项工作的目的是产生关于ASR微波热解后固体产品的有机残留物转化的基础知识，在不同温度下用两种不同类型的气化剂处理：纯蒸汽或3%（v/v）的氧气。该研究使用实验室规模的推流式气化炉进行，具有用于分析质量损失随实验时间变化的集成规模，作为950，850和760摄氏度的宏观TG。根据气化和热解阶段的碳转化率，研究了煤焦分解反应速率。结果表明，无论气化剂是什么，两种馏分的半焦转化率均随外界气体温度的升高而降低。水蒸气和氧气对焦炭分解的反应速率没有显著差异。这种异常的焦炭行为可能是由于灰分，特别是碱金属对焦炭活性的抑制作用或由于微波加热过程中焦炭结构的变形造成的。(C)2010 Elsevier B. V.保留所有权利。
Pyrolysis enables to recover metals and organic feedstock from waste conglomerates such as: automotive shredder residue (ASR). ASR as well as its pyrolysis solid products, is a morphologically and chemically varied mixture, containing mineral materials, including hazardous heavy metals. The aim of the work is to generate fundamental knowledge on the conversion of the organic residues of the solid products after ASR's microwave pyrolysis, treated at various temperatures and with two different types of gasifying agent: pure steam or 3% (v/v) of oxygen. The research is conducted using a lab-scale, plug-flow gasifier, with an integrated scale for analysing mass loss changes over time of experiment, serving as macro TG at 950, 850 and 760 degrees C. The reaction rate of char decomposition was investigated, based on carbon conversion during gasification and pyrolysis stage. It was found in both fractions that char conversion rate decreases with the rise of external gas temperature, regardless of the gasifying agent. No significant differences between the reaction rates undergoing with steam and oxygen for char decomposition has been observed. This abnormal char behaviour might have been caused by the inhibiting effects of ash, especially alkali metals on char activity or due to deformation of char structure during microwave heating. (C) 2010 Elsevier B.V. All rights reserved.