Emission control of an ammonia-air flame in a coaxial tangential injection combustor at elevated pressure conditions

IF 5.8 2区工程技术 Q2 ENERGY & FUELS Combustion and Flame Pub Date : 2024-06-05 DOI:10.1016/j.combustflame.2024.113536

Min Jung Lee , Young Tae Ghuak , Woonam Jung , Namsu Kim

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Abstract

This study is the first to present the emission characteristics of the fuel staging method for a pure ammonia-air flame using a coaxial tangential injection combustor. The primary combustor used in this study had the same swirl number of 3.3 as in a previous study; however, the dimension of the combustor was increased to examine at a higher thermal load. The emissions of NO, NO₂, N₂O, and NH₃ were measured simultaneously under an elevated pressure. Consequently, secondary ammonia injection (fuel staging) was confirmed to be effective for NO_x abatement even under pressurized conditions. In addition, excessive secondary ammonia injection exhibited an additional NO_x reduction effect coupled with the generation of unburned N₂O and NH₃. The optimized amounts of NO_x, N₂O, and NH₃ were 83, 23, and 11 ppm (@15 % O₂, dry), respectively. The results of this study are expected to be useful as significant design and operating data for pure ammonia gas turbines.

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高压条件下同轴切向喷射燃烧器中氨气火焰的排放控制

本研究首次介绍了使用同轴切向喷射燃烧器的纯氨气火焰燃料分级法的排放特性。本研究中使用的主燃烧器的漩涡数为 3.3，与之前的研究相同；但是，为了研究更高的热负荷，增加了燃烧器的尺寸。在高压下同时测量了 NO、NO2、N2O 和 NH3 的排放量。因此，即使在加压条件下，二次氨喷射（燃料分级）也能有效减少氮氧化物。此外，过量的二次氨水喷射在产生未燃烧的 N2O 和 NH3 的同时，还具有额外的氮氧化物减排效果。氮氧化物、N2O 和 NH3 的优化量分别为 83、23 和 11 ppm（@15 % O2，干）。这项研究的结果有望成为纯氨燃气轮机的重要设计和运行数据。

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来源期刊

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.