氨制氢:便携式裂解系统及相关微通道反应器的初步设计

IF 8.3 2区 工程技术 Q1 CHEMISTRY, PHYSICAL
Dong Ho Nguyen , Phu Quoc Nguyen , Sang Moon Kim , Ji Hoon Kim , Gyu Hyeon Shim , Ho Seon Ahn
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引用次数: 0

摘要

本研究介绍了一种创新且节能的便携式氨分解系统,专为移动应用而设计。主要特点包括:(1)毛细管利用环境热量蒸发液氨,降低能耗7.7%;(2)板式换热器,回收反应器产品的热量,对氨料进行预热,使反应器加热能耗降低8.7%;(3)采用焦耳加热的微通道反应器,与传统燃烧方法相比,该反应器显著降低了热阻。热平衡分析表明,供热功率约占启动时总发电量的47%,稳定运行时占总发电量的38.9%。此外,这项工作首次提出了微通道技术与焦耳加热氨分解的集成。在COMSOL Multiphysics 6.1中开发的3D模型探讨了加热功率、催化剂厚度、通道长度和水力直径对反应器性能的影响。结果表明,系统在反应控制条件下运行(Damköhler数<;0.1),加热功率是影响氨转化的最大因素。传质足够快,限制了催化剂层厚度、通道长度和液压直径对转化的影响,但显著影响压降。此外,为了优化反应堆性能,提出了一个多目标框架,该框架结合了改进的建筑性能优化(BPO)技术、人工神经网络(ann)和非支配排序遗传算法II (NSGA-II算法)。优化了包括通道尺寸在内的关键设计参数,以最大限度地提高氨转化率并最小化压降。TOPSIS决策方法确定了最优设计,与基本情况相比,转化率提高了26.68%,压降降低了85.79%。总体而言,本文的结果为设计一个移动制氢系统和微通道反应器提供了一个全面的策略,该反应器通过氨分解为1kw PEMFC供电。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydrogen production from ammonia: Preliminary design of portable cracking system and related micro-channel reactor
This study introduces an innovative and energy-efficient portable ammonia decomposition system designed for mobile applications. Key features include: (1) a capillary tube that utilizes ambient heat to evaporate liquid ammonia, reducing energy consumption by 7.7 %; (2) a plate heat exchanger that recovers heat from reactor products to preheat the ammonia feed, cutting reactor heating energy by 8.7 %; and (3) a microchannel reactor with Joule heating, which significantly lowers thermal resistance compared to conventional combustion methods. Heat balance analysis shows that heating power accounts for approximately 47 % of total generated electricity during startup and 38.9 % during steady operation. In addition, this work presents the first integration of microchannel technology with Joule heating for ammonia decomposition. A 3D model, developed in COMSOL Multiphysics 6.1, explores the effects of heating power, catalyst thickness, channel length, and hydraulic diameter on reactor performance. Results reveal that the system operates under reaction-controlled conditions (Damköhler number <0.1), making heating power the most influential factor for ammonia conversion. Mass transfer is sufficiently rapid, limiting the impact of catalyst layer thickness, channel length, and hydraulic diameter on conversion but significantly affecting pressure drop. Moreover, to optimize reactor performance, a multi-objective framework is proposed, combining a modified building performance optimization (BPO) technique, artificial neural networks (ANNs), and the Non-dominated Sorting Genetic Algorithm II (NSGA-II algorithm). Key design parameters, including channel dimensions, were optimized to maximize ammonia conversion and minimize pressure drop. The TOPSIS decision-making method identified an optimal design, achieving a 26.68 % improvement in conversion and an 85.79 % reduction in pressure drop compared to the base case. Overall, the results of this paper provide a comprehensive strategy for designing a mobile hydrogen production system and microchannel reactors for hydrogen production via ammonia decomposition powering 1 kW PEMFC.
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来源期刊
International Journal of Hydrogen Energy
International Journal of Hydrogen Energy 工程技术-环境科学
CiteScore
13.50
自引率
25.00%
发文量
3502
审稿时长
60 days
期刊介绍: The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.
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