A System Analysis of Pressurized Electrolysis for Compressed Hydrogen Production

ASME 2019 13th International Conference on Energy Sustainability Pub Date : 2019-12-03 DOI:10.1115/es2019-3908

Ryan T. Hamilton, D. McLarty

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引用次数: 1

Abstract

Renewable production of hydrogen offers a clean and sustainable replacement of fossil fuels. As an energy carrier hydrogen is compressed and stored at high pressures. Pressurized water electrolysis improves plant performance as hydrogen compression is an energy intensive process. This work analyzes hydrogen production over the temperature range of 100°C to 800°C and pressure range of 1 bar to 700 bar. The sensitivity of plant efficiency to hydrogen compression technology and waste heat recovery is investigated. This study reveals that a lower-heating-value electric energy efficiency of 84% can be achieved when pressurized electrolysis avoids the inefficiencies of hydrogen compression. With the availability of high-quality waste heat plant efficiency can reach 98% for a pipeline distribution scenario at 3MPa. When no waste heat is available plant efficiency is independent of electrolysis temperature. For hydrogen use in the transportation sector, pressurized supercritical water electrolysis at 800°C has the potential to improve plant efficiency by 14% from a baseline of non-pressurized electrolysis at 800°C.

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加压电解制氢的系统分析

氢气的可再生生产为化石燃料提供了一种清洁和可持续的替代品。作为一种能量载体，氢被压缩并储存在高压下。加压水电解提高了工厂的性能，因为氢气压缩是一个能源密集型的过程。这项工作分析了温度范围为100°C至800°C，压力范围为1 bar至700 bar的氢气生产。研究了装置效率对氢气压缩技术和余热回收的敏感性。本研究表明，当加压电解避免了氢压缩的低效率时，可以实现84%的低热值电能效率。随着高质量余热装置的可用性，在3MPa的管道分配场景下，效率可达到98%。当没有废热可用时，工厂效率与电解温度无关。对于运输部门的氢气使用，800°C的加压超临界电解有可能将工厂效率从800°C的非加压电解基线提高14%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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ASME 2019 13th International Conference on Energy Sustainability

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