期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 47, 期 11, 页码 7478-7490出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.12.084
关键词
Methanol reforming; Hydrogen; Methanol conversion; Waste heat recovery; Fin; Diffuser
Hydrogen-rich combustion in engines helps reduce pollutants, but the poor energy storage density of hydrogen limits its usage on moving vehicles. This study focuses on using methanol as a fuel to produce hydrogen through steam reforming reaction, utilizing exhaust engine waste energy for thermochemical recuperation. By improving the design of the reactor with a finned surface and diffusing inlet section, the conversion of methanol is significantly increased.
Hydrogen-rich combustion in engines helps in reducing pollutants significantly. But hydrogen usage on a moving vehicle is not getting large-scale user acceptance mainly due to its poor energy storage density resulting in shorter driving ranges. This storage issue led to the hunt for mediums that can efficiently produce on-board hydrogen. Methanol proves to be an efficient alcohol fuel for producing hydrogen through steam reforming reaction. The heat energy required for such endothermic reaction is obtained through exhaust engine waste energy and this process is collectively known as thermochemical recuperation. However, the conventional reactor used for this process faces a lot of problems in terms of efficiency and methanol conversion. In this study, an attempt has been made to improve the design of the reactor for on-board hydrogen generation using engine exhaust heat for addressing the challenges related to performance and hydrogen yield. For enhancing the heat transfer, a finned surface (straight & wavy) was introduced in the reactor which resulted in an increment in methanol conversion significantly. It was found that wavy fin improved the methanol conversion up to 96.8% at an exhaust inlet temperature of 673 K. Also, a diffusing inlet section was introduced to increase the residence time of reactant gases while passing through the catalyst zone. Under given inlet conditions, the methanol conversion for 6 degrees diffuse inlet reactor goes up to 87.9% as compared to 75.4% for the conventional reactor. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据