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Efficient production of hydrogen through recuperative solid oxide electrolysis.

机译：通过换热式固体氧化物电解高效生产氢气。

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摘要

The necessity for the highly efficient production of hydrogen increased as the hydrogen economy emerged as a promising answer for tomorrow's energy woes. The generation of hydrogen through electrolysis possessed several advantages, such as high efficiency, low pollutant emissions and flexible fueling strategies. The main goal of this research was to increase the efficiency of hydrogen production by operating the Solid Oxide Electrolysis Cell (SOEC) at an optimum combination of operating conditions. Theoretically, the efficiency of a solid oxide electrolysis cell improved with increased temperature as a result of reduction in the Gibbs free energy change. This study researched and proposed an alternative way to achieve the high temperatures required for the electrolysis process.;The investigation consisted of three main features: conceptualization, modeling/simulation and validation. The conceptualization phase explained the concept of the recuperative solid oxide electrolysis cell that utilized thermal energy from exhaust gases and solar energy. In the second stage, a mathematical model was developed that described the operation of the recuperative solid oxide electrolysis system. Various operating parameters, such as voltage, steam utilization, area specific resistance, the size of the heat exchangers, and number of cells, among others, were used to model the system. The formulated model was then simulated, using a software package developed for this purpose. The final stage was to obtain results from an experimental set up to validate the model. In the experimental set up, the SOEC cell was subjected to a range of steam utilization and operating voltage to estimate the temperature response and hydrogen production.;The main objective of this work was to identify the optimum operating conditions of the recuperative solid oxide electrolysis system through parametric modeling. This modeling includes investigating whether the operation of the electrolysis cells at an operating voltage above the thermoneutral voltage was beneficial in the long run. The profit obtained from the production of hydrogen over the lifetime of operation of the solid oxide electrolysis cell was calculated for each set of operating conditions. It was found that the exit temperature of the gas streams depended on the operating voltage and steam utilization, simultaneously. It was also found that operating the recuperative electrolysis cell above thermoneutral voltage at around 1.4V-1.5V to be profitable in terms of hydrogen production.
机译：随着氢经济的兴起，对解决明天能源危机的有希望的答案，对高效氢生产的必要性也增加了。通过电解产生氢具有多个优点，例如效率高，污染物排放低和灵活的加油策略。这项研究的主要目的是通过在最佳操作条件下操作固体氧化物电解槽（SOEC）来提高制氢效率。从理论上讲，由于吉布斯自由能变化的减少，固体氧化物电解槽的效率随温度的升高而提高。本研究研究并提出了实现电解过程所需高温的另一种方法。研究包括三个主要特征：概念化，建模/模拟和验证。概念化阶段解释了回热式固体氧化物电解池的概念，该单元利用了来自废气和太阳能的热能。在第二阶段，开发了描述回热式固体氧化物电解系统操作的数学模型。各种操作参数（例如电压，蒸汽利用率，面积比电阻，热交换器的大小和单元数等）已用于对系统进行建模。然后使用为此目的开发的软件包对制定的模型进行仿真。最后阶段是从实验设置中获得结果以验证模型。在实验装置中，对SOEC电池进行一定的蒸汽利用率和工作电压范围的估算，以估算温度响应和产氢量。该工作的主要目的是确定同流式固体氧化物电解系统的最佳运行条件通过参数化建模。该模型包括研究从长期来看，在高于热中性电压的工作电压下运行电解槽是否有益。对于每组操作条件，计算在固体氧化物电解池的整个使用寿命期间从氢气生产中获得的利润。发现气流的出口温度同时取决于工作电压和蒸汽利用率。还发现使回热式电解槽在大约1.4V-1.5V的热中性电压以上工作可产生氢气。

著录项

  • 作者

    Gopalan, Sriram.;

  • 作者单位

    Howard University.;

  • 授予单位 Howard University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 146 p.
  • 总页数 146
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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