Experimental and simulated study of ammonia blending with DME steam reformed and cracked gases under lean-burn condition

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2024-11-13 DOI:10.1016/j.ijhydene.2024.10.177

Xuanrui Zhang , Xiangyu Meng , Wenchao Zhu , Wuqiang Long , Mingshu Bi

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引用次数: 0

Abstract

Dimethyl ether (DME) steam reforming (SR) and cracking (CR) can not only achieve on-line production of hydrogen (H₂) and methane (CH₄) but also increase fuel energy. The ammonia blending with DME-SR or DME-CR gases is an effective method to enhance the reactivity of ammonia combustion. This paper aims to compare the effects of DME-SR and DME-CR on combustion and emissions under lean-burn condition. In the constant volume combustion chamber (CVCC) experiments, the in-chamber pressure and flame propagation process were measured for NH₃/H₂ and NH₃/CH₄ blends, and NO emissions were visualized by chemiluminescence. A three-dimensional (3D) model was established with validation by the experimental data. Based on this model, the effects of DME-SR and DME-CR on combustion process and NO_x emissions were studied. The results showed that both DME-SR and DME-CR can enhance the ammonia combustion process under lean-burn condition. The case with DME energy ratio 70% and the equivalence ratio of 0.4 for SR (X70ER0.4-SR), and X30ER0.5-SR can achieve faster combustion rates than pure ammonia at ER of 1.0 (X0ER0.9) due to the main reforming product of H₂. The ammonia blended with fuels from DME-SR and CR can help to improve the NO emission under lean-burn condition, being lower than X0ER0.9. These findings highlight the advantages of using DME-SR and DME-CR for improving the ammonia combustion. Considering the fuel energy increment, DME-CR could be potential to obtain better fuel economy and emission improvement in real engine application.

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贫燃条件下合成氨与二甲醚蒸汽转化气和裂解气混合的实验和模拟研究

二甲醚（DME）蒸汽重整（SR）和裂解（CR）不仅能实现氢气（H2）和甲烷（CH4）的在线生产，还能增加燃料能量。氨与二甲醚-SR 或二甲醚-CR 气体混合是提高氨燃烧反应性的有效方法。本文旨在比较 DME-SR 和 DME-CR 在贫燃条件下对燃烧和排放的影响。在恒容燃烧室（CVCC）实验中，测量了 NH3/H2 和 NH3/CH4 混合物的腔内压力和火焰传播过程，并用化学发光法观察了氮氧化物的排放。通过实验数据的验证，建立了一个三维（3D）模型。基于该模型，研究了 DME-SR 和 DME-CR 对燃烧过程和氮氧化物排放的影响。结果表明，在贫燃烧条件下，DME-SR 和 DME-CR 都能增强氨的燃烧过程。二甲醚能量比为 70%、SR 的等效比为 0.4（X70ER0.4-SR）和 X30ER0.5-SR 的情况下，由于主要重整产物为 H2，其燃烧速率比 ER 为 1.0（X0ER0.9）的纯氨更快。与二甲醚-SR 和 CR 燃料混合的氨有助于改善贫燃条件下的氮氧化物排放，低于 X0ER0.9。这些发现凸显了使用 DME-SR 和 DME-CR 改善氨燃烧的优势。考虑到燃料能量的增加，DME-CR 有可能在实际发动机应用中获得更好的燃油经济性和排放改善。

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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来源期刊

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.