Stability and NO production of lean premixed ammonia/methane turbulent swirling flame

doi:10.11949/0438-1157.20220446

Abstract

Abstract:

To study the flame stability and NO emission characteristics of lean premixed ammonia/methane turbulent swirling flame, a visual swirling turbulent combustion device was designed and built, and a series of experimental measurements was carried out. The results show that the range of stable combustion of ammonia flame became wider with the increase of equivalence ratio, but when the ammonia mixing ratio was greater than 0.60, the flame oscillated up and down in the chamber and finally blow out; with the increase of equivalence ratio, the NO emission increased; under the same equivalence ratio, NO emission first increased and then decreased with the increase of ammonia mixing ratio. In addition, the chemical reactor network (CRN) method and the one-dimensional laminar flow premixed flame calculation method were used to numerically analyze the corresponding flame states. Although there was a large deviation between the calculated results and the experimental results, the predicted variation trend of NO emission with the ammonia mixing ratio and equivalence ratio was consistent with the experimental results. The sources of the deviation among the three results were analyzed.

Key words: ammonia combustion, lean premixed turbulent flame, NO emission, combustion experimental measurement, numerical simulation

摘要：

为了研究氨气/甲烷掺混燃气在贫预混旋转湍流状态下的火焰稳定性及NO的排放特性，设计建造了一个可视化的旋转湍流燃烧装置，开展了一系列的实验测量研究。研究表明：随着当量比增大，氨气火焰稳定燃烧的范围有所扩大，但当氨气掺混比大于0.60时火焰出现上下振荡现象，继续增加将导致火焰吹熄；NO的排放水平随当量比增加而提高；但在相同的当量比下，NO的排放随氨气掺混比的增加先升高再下降。此外，分别采用化学反应器网络（CRN）方法和一维层流预混火焰计算方法，对相应的火焰状态进行了数值计算分析，虽然计算结果与实验结果误差较大，但其预测的NO排放特性随氨气掺混比、当量比的变化趋势是一致的，对三者之间误差的来源进行了分析。

关键词: 氨气燃烧, 贫燃预混湍流火焰, 一氧化氮排放, 燃烧实验测量, 数值模拟

CLC Number:

TK 16

Yongqian WANG, Ping WANG, Kang CHENG, Chenlin MAO, Wenfeng LIU, Zhicheng YIN, Antonio Ferrante. Stability and NO production of lean premixed ammonia/methane turbulent swirling flame[J]. CIESC Journal, 2022, 73(9): 4087-4094.

王永倩, 王平, 程康, 毛晨林, 刘文锋, 尹智成, Ferrante Antonio. 氨气/甲烷贫预混旋转湍流火焰稳定性及NO生成[J]. 化工学报, 2022, 73(9): 4087-4094.

Figures/Tables 10

Fig.1 Schematic of the experimental set-up

Fig.2 Geometric sketch of the burner

Fig.3 Schematic of radial swirler

Table 1 The state parameters studied in the experiment

ϕ	$X N H 3$
0.65	0~0.60
0.70	0~0.60
0.75	0~0.60
0.80	0~0.60

Table 1 The state parameters studied in the experiment

ϕ	$X N H 3$
0.65	0~0.60
0.70	0~0.60
0.75	0~0.60
0.80	0~0.60

Fig.4 Layout of chemical reactor network model

Fig.5 Flame images for different mixing ratio of NH3 at ϕ=0.70

Fig.6 Experimentally measured NO emission as function of XNH3 and ϕ

Fig.7 Comparison of experimental and simulated NO emissions (along the arrow direction ϕ=0.65, 0.70, 0.75,0.80)

Fig.8 Flame temperature as a function of XNH3 at different equivalence ratio

Fig.9 Rate of NO production in flame zone of primary combustion zone for NH3/CH4 fuel mixture

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