Non-adiabatic effect on NOx emissions for premixed H2-blended NH3/air combustion under rich-lean-staged conditions

IF 8.1 2区工程技术 Q1 CHEMISTRY, PHYSICAL International Journal of Hydrogen Energy Pub Date : 2024-11-16 DOI:10.1016/j.ijhydene.2024.11.164

Zhaoxing Li, Yang Zhang, Hai Zhang

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Abstract

The non-adiabatic effect on NOx emission for the swirl premixed NH₃/H₂/air combustion under fuel-rich/quick-mix/fuel-lean (RQL) conditions was experimentally studied. The wall temperature of the quartz combustor was controlled by surrounding heating. Results showed that both H₂-blending and thermal insulation were in favor of enlarging the low-NOx range and lowering the valley NOx, due to the less NO and unburnt NH₃, and smaller flow rate from the primary stage. In the post-flame zone of the primary stage, increasing combustion temperature significantly enhanced NO reduction, Thus, for low NOx emission, it is essential to keep enough thermal insulation there. Experimental measurements also found remarkable N₂O could be formed in the secondary stage when combustion temperature was low and much unburnt NH₃ was excessive. Kinetic analyses showed this phenomenon was due to the high combination rate of NH and NO, and low reduction rate of H radical.

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在富余-贫乏阶段条件下，预混 H2 混合 NH3/ 空气燃烧的非绝热效应对氮氧化物排放的影响

实验研究了在燃料丰富/快速混合/燃料贫乏（RQL）条件下，漩涡预混合 NH3/H2/air 燃烧对氮氧化物排放的非绝热影响。石英燃烧器的壁温由周围加热控制。结果表明，由于氮氧化物和未燃烧的 NH3 较少，以及初级阶段的流速较小，H2 混合和隔热都有利于扩大低氮氧化物范围和降低氮氧化物谷值。在初级燃烧阶段的后火焰区，燃烧温度的升高显著提高了氮氧化物的减少量，因此，为了实现低氮氧化物排放，必须在该区域保持足够的隔热性能。实验测量还发现，当燃烧温度较低且未燃烧的 NH3 过多时，二级燃烧区会形成显著的 N2O。动力学分析表明，造成这种现象的原因是 NH 和 NO 的结合率高，而 H 自由基的还原率低。

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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.