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首页> 外文期刊>Energy Conversion & Management >Thermodynamic analysis of a solid oxide co-electrolysis cell system for its optimal thermal integration with external heat supply
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Thermodynamic analysis of a solid oxide co-electrolysis cell system for its optimal thermal integration with external heat supply

机译：固体氧化物共电池系统热力学分析及外部供热的最佳热集成

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摘要

A solid oxide co-electrolysis cell system is expected to play a more crucial role in the field of energy and environment under the pressure of carbon emission regulation. Based on its high-operating temperature and ability to decompose steam and carbon dioxide simultaneously, solid oxide co-electrolysis cell can provide highly efficient and economic means of carbon conversion to synthetic gas. However, most of the previous studies are focused on the performance of a stack itself without investigating the key features of a thermodynamic system. Thus, in this study, we develop a solid oxide co-electrolysis cell thermodynamic system model which incorporates design variables and empirical correlations of a stack and several balance-of-plant components as well as fluid characteristics of incoming working fluids. The basic concept of a solid oxide co-electrolysis cell system is designed and integrated with an oxy-fuel combustion power cycle from which high-quality heat and high-purity carbon dioxide are supplied. 72 different system layouts are suggested, each of which has unique thermal integration regarding external heat supply and exhaust gas utilization method. Using temperature-heat transfer diagram analysis, the system layouts that are thermodynamically infeasible are screened out. After screening out similar layouts once again, 11 candidate system layouts are chosen and investigated in detail. It can be evidenced that using minimal amount of external heat is key to increase the system efficiency. Moreover, immediate branching of external heat flux into two main-heating heat exchangers as soon as it is discharged from the steam generator shows the least pressure drop in the main heat exchanger for air due to its short heat exchange path, minimizing the parasitic power. The optimal solid oxide co-electrolysis cell system layout shows the energy efficiency of 37.31% and the exergy efficiency of 23.97%. This study suggests the key idea of thermal integration of solid oxide co-electrolysis cell system integrated with potential high-quality heat and carbon dioxide sources, which provides effective and reliable basis on which system demonstration and actual operation can be performed.
机译：预期固体氧化物协同电解细胞系统在碳排放调节压力下在能量和环境领域发挥更重要的作用。基于其高工作温度和能力同时分解蒸汽和二氧化碳，固体氧化物共电池可以提供高效和经济的碳转化方法对合成气体。然而，大多数先前的研究都集中在堆栈本身的性能上，而无需调查热力学系统的关键特征。因此，在该研究中，我们开发了一种固体氧化物共同电解细胞热力学系统模型，其包括堆叠的设计变量和经验相关性和几种植物平衡组件以及进入工作流体的流体特性。固体氧化物协同电解槽系统的基本概念设计并与氧燃料燃烧动力循环一起设计和整合，从中提供高质量的热和高纯度二氧化碳。提出了72种不同的系统布局，每个系统都具有关于外部供热和废气利用方法的独特热集成。使用温度传热图分析，筛选出热力学上不可行的系统布局。在再次筛选类似的布局之后，详细选择并研究了11个候选系统布局。可以证明使用最小量的外部热量是提高系统效率的关键。此外，一旦它从蒸汽发生器排出，就立即将外部热通量的分支到两个主加热热交换器中，表示由于其短的热交换路径，最小化寄生功率，最小化了空气的主热交换器中的最小压降。最佳的固体氧化物共同电解电池系统布局显示出37.31％的能量效率，漏胀效率为23.97％。本研究表明，与潜在的高质量热和二氧化碳源集成的固体氧化物协同电解槽系统热整合的关键概念，可提供有效可靠的基础，并可进行系统演示和实际操作。

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