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A numerical evaluation of the design of an autothermal reformer for the onboard production of hydrogen from iso-octane.

机译:对自异辛烷船上生产氢气的自动热重整器设计的数值评估。

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摘要

A numerical study was carried out to improve the design of an autothermal reformer for the onboard production of hydrogen to be used in fuel-cell-powered auxiliary power units (APU) to provide heating and electricity in long haul trucks when they are at rest. The development of these auxiliary power units is based upon the use of power generated by solid oxide fuel cell (SOFC) system, instead of from a conventional gasoline engine. The present work was undertaken to improve the design of a prototype autothermal fuel reformer that had been developed by the Fuel Cell Research Centre (FCRC) at Queen's University to convert liquid hydrocarbon truck fuel to a hydrogen rich product gas. In this development work and in the previous work iso-octane (C8H 18) has been used as a surrogate fuel.;Using this surrogate of gasoline, the reformer was simulated using various inlet steam/carbon (H2O/C), oxygen/carbon (O/C) molar ratios and gas-hourly-space-velocity (GHSV). In the reformer considered the reforming process is carried out in a compact tubular reactor with a centerline thermocouple tube using a 2% Pt-ZrCe based catalyst with a local porosity of 0.6. During the initial simulations, it was observed that near the start of the catalyst region there were large temperature gradients due to an exothermic partial oxidation reaction. In order to reduce the temperature gradients and facilitate heat transfer by conduction along the reformer, the central thermocouple tube was replaced with a central solid rod. The effects of variations in the thermal conductivity of central solid rod, of the reactor wall, of the catalyst bed, of the inert porous material near the inlet and the outlet of the catalyst bed, of the gas hourly space velocity, of the effectiveness factor of the chemical reaction mechanism on the performance of the reactor were studied. The results so obtained were analyzed to determine potential design improvements that would increase the hydrogen output. The results were compared with the previous numerical and experimental results obtained in the previous studies of the reformer and found to be in good agreement with the general trends of the temperature profiles as well as the outlet molar concentrations of product species.;After the analysis and evaluation of all the results, it was found that by replacement of central thermocouple tube with central solid rod made of high conductivity material and by using material for inert porous region at the outlet that had a thermal conductivity equal to that of the catalyst bed led to more even temperature profiles within the catalyst region. It was also found that the hydrogen molar percentage output could be increased by approximately more than 25% and that the length of the reactor could be reduced by 20mm by incorporating these changes in the reformer design.
机译:进行了一项数值研究,以改进用于船上生产氢气的自动热重整器的设计,该重整器将用于燃料电池供电的辅助动力装置(APU),以在长途卡车静止时提供热量和电力。这些辅助动力装置的开发基于使用固体氧化物燃料电池(SOFC)系统而不是传统汽油发动机产生的动力。目前的工作是为了改进原型自动热燃料重整器的设计,该重整器是由女王大学的燃料电池研究中心(FCRC)开发的,用于将液态烃卡车燃料转化为富氢产品气。在这项开发工作中以及在以前的工作中,异辛烷(C8H 18)被用作替代燃料。使用这种替代汽油,重整炉使用各种进口蒸汽/碳(H2O / C),氧/碳进行模拟(O / C)摩尔比和气体时空速度(GHSV)。在考虑的重整器中,重整过程是在带有中心线热电偶管的紧凑型管状反应器中进行的,使用的是2%Pt-ZrCe基催化剂,局部孔隙率为0.6。在最初的模拟过程中,观察到在催化剂区域的开始附近,由于放热的部分氧化反应,温度梯度较大。为了降低温度梯度并通过沿重整器的传导促进热量传递,将中央热电偶管替换为中央实心棒。中心固体棒,反应器壁,催化剂床,催化剂床进口和出口附近的惰性多孔材料的导热系数,气体时空速度,有效系数的变化的影响研究了化学反应机理对反应器性能的影响。对如此获得的结果进行分析,以确定可能增加氢输出量的潜在设计改进。将结果与重整器先前研究中获得的先前数值和实验结果进行比较,发现与温度曲线的总体趋势以及产品种类的出口摩尔浓度完全吻合。对所有结果进行评估后发现,用高导热率材料制成的中心实心棒代替中央热电偶管,并在出口处使用导热率等于催化剂床层的惰性孔区域材料,可导致催化剂区域内的温度分布更均匀。还发现,通过将这些改变纳入重整器设计中,氢摩尔百分比输出可以增加约25%以上,并且反应器的长度可以减少20mm。

著录项

  • 作者

    Hussain, Shafqat.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.Sc.(Eng)
  • 年度 2009
  • 页码 140 p.
  • 总页数 140
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

  • 入库时间 2022-08-17 11:37:38

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