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首页> 外文期刊>Energy Conversion & Management >Valorisation of different waste plastics by pyrolysis and in-line catalytic steam reforming for hydrogen production
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Valorisation of different waste plastics by pyrolysis and in-line catalytic steam reforming for hydrogen production

机译：通过热解和在线催化蒸汽重整来生产氢气来对不同的废塑料进行估价

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The performance of an original two-step reaction system (pyrolysis and in-line reforming) was assessed in the hydrogen production from different plastics (polyethylene, polypropylene, polyethylene terephthalate and polystyrene) and their mixture. The pyrolysis step was performed in a conical spouted bed reactor at 500 degrees C, whereas the reforming of pyrolysis volatiles was carried out in a fluidized bed reactor at 700 degrees C. This two in-line reactor configuration was initially developed for the reforming of high density polyethylene pyrolysis volatiles, and this paper describes the influence composition of pyrolysis products derived from different plastics has on the reforming step, conversion, product yields and deactivation behavior. The products formed in both the pyrolysis and the reforming steps were analysed by on-line gas chromatography and micro-gas chromatography. Significant differences in the reforming behaviour of the plastics were observed, with hydrogen productions being higher in the case of polyolefins (from 34.8 to 37.3 wt%) followed by polystyrene (29.1 wt%) and remarkably lower for polyethylene terephthalate (18.2 wt%). Furthermore, the evolution of conversion and product distribution with time on stream was assessed for the different plastics studied and the catalyst deactivation rate was related to the amount and morphology of the coke deposited on the reforming catalyst. It was proven that the features of the reactors used in the pyrolysis and reforming steps are suitable for minimizing operational problems, and therefore operating in continuous regime.
机译：在不同塑料（聚乙烯，聚丙烯，聚对苯二甲酸乙二醇酯和聚苯乙烯）及其混合物的制氢过程中，评估了原始两步反应系统（热解和在线重整）的性能。热解步骤在锥形喷头床反应器中于500摄氏度下进行，而热解挥发物的重整在流化床反应器中于700摄氏度下进行。最初开发这两个串联反应器配置用于重整高塔密度聚乙烯热解挥发物，本文描述了不同塑料衍生的热解产物的组成对重整步骤，转化率，产物收率和失活行为的影响。通过在线气相色谱和微气相色谱分析在热解和重整步骤中形成的产物。观察到塑料的重整行为存在显着差异，其中聚烯烃的氢产生较高（从34.8至37.3 wt％），其次是聚苯乙烯（29.1 wt％），而聚对苯二甲酸乙二醇酯（18.2 wt％）的产生氢显着较低。此外，对于所研究的不同塑料，评估了转化率和产物分布随运行时间的变化，并且催化剂失活速率与沉积在重整催化剂上的焦炭的量和形态有关。已经证明，在热解和重整步骤中使用的反应器的特征适合于最小化操作问题，并因此以连续方式操作。

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