CO2稀释对甲烷反扩散火焰结构的影响研究

doi:10.11949/0438-1157.20211305

摘要/Abstract

摘要：

基于火焰光谱诊断平台，利用由高分辨率CCD相机成像系统和光纤光谱仪组成的光谱成像系统对甲烷反扩散火焰的光谱辐射特性进行研究。获得了不同氧燃当量比和CO₂稀释水平下CH₄/O₂同轴射流反扩散火焰的OH*、CH*二维辐射分布并进行了Abel反卷积处理。结果表明：随氧燃当量比的增加，OH*火焰逐渐中空，火焰锋面被拉伸，轴向高度和火焰面积均先增大后减小。CH*火焰核心反应区位置和形状随当量比增加变化不明显。随CO₂稀释剂体积分数的增加，OH*火焰被拉伸，并由完全包络状过渡为对称包络状，火焰面积逐渐减小。CH*火焰被拉伸并靠近中央轴线，火焰面积逐渐增大。对比OH*火焰层，CH*火焰层较薄且峰值强度低。

关键词: 甲烷, 自由基, 扩散, 火焰结构, CO₂ 稀释火焰

Abstract:

Based on the flame spectrum diagnostic platform, a spectral imaging system composed of a high-resolution CCD camera imaging system and a fiber optic spectrometer is used to study the spectral radiation characteristics of the methane inverse diffusion flame. The OH* and CH* two-dimensional radiation distributions of the IDF with various oxygen-fuel equivalence ratios and CO₂ dilution levels were obtained by the flame spectrum imaging system. The OH* and CH* emission data was deconvoluted by using an inverse Abel transform to analyze flame structure. The results show that the OH* flame gradually became hollow, the flame front was stretched, and the axial height and flame area both increased first and then decreased with the increase of the oxygen-to-fuel equivalence ratio. The position and shape of the CH* flame core reaction zone was unchanged significantly with the change of the equivalence ratio. The OH* flame was stretched and transformed from a completely enveloped shape to a symmetrical envelope shape with the increase of the CO₂ diluent volume fraction in the oxidant. The CH* flame was stretched closer to the central axis. The OH* flame area decreased and the CH* flame area increased due to the influence of CO₂ dilution. Compared with the OH* flame layer, the CH* flame layer was thinner and the peak intensity was low.

Key words: methane, radical, diffusion, flame structure, CO₂ dilution flame

中图分类号:

O 433.52

闫帅, 杨家宝, 龚岩, 郭庆华, 于广锁. CO₂稀释对甲烷反扩散火焰结构的影响研究[J]. 化工学报, 2022, 73(3): 1335-1342.

Shuai YAN, Jiabao YANG, Yan GONG, Qinghua GUO, Guangsuo YU. Effects of CO₂ dilution on the structure of methane inverse diffusion flame[J]. CIESC Journal, 2022, 73(3): 1335-1342.

图/表 11

图1 火焰化学发光检测平台

Fig.1 Flame chemiluminescence detection platform

表1 试验工况条件

Table 1 Experimental conditions

序号	$Q C H 4$ / (L·min^-1)	$Q O 2$ / (L·min^-1)	$Q C O 2$ / (L·min^-1)	$X C O 2$ / %	U_氧化剂/ (m·s^-1)	λ
1	0.5	0.6	0	0	0.796	0.6
2	0.5	0.7	0	0	0.928	0.7
3	0.5	0.8	0	0	1.061	0.8
4	0.5	0.9	0	0	1.194	0.9
5	0.5	1.0	0	0	1.326	1.0
6	0.5	1.1	0	0	1.459	1.1
7	0.5	1.2	0	0	1.592	1.2
8	0.5	1.3	0	0	1.724	1.3
9	0.5	1.4	0	0	1.857	1.4
10	0.5	1.0	0.2	16.7	1.592	1.0
11	0.5	1.0	0.3	23.1	1.724	1.0
12	0.5	1.0	0.4	28.6	1.857	1.0
13	0.5	1.0	0.5	33.3	1.989	1.0
14	0.5	1.0	0.6	37.5	2.122	1.0
15	0.5	1.0	0.7	41.2	2.255	1.0
16	0.5	1.0	0.8	44.4	2.387	1.0
17	0.5	1.0	0.9	47.4	2.520	1.0

表1 试验工况条件

Table 1 Experimental conditions

序号	$Q C H 4$ / (L·min^-1)	$Q O 2$ / (L·min^-1)	$Q C O 2$ / (L·min^-1)	$X C O 2$ / %	U_氧化剂/ (m·s^-1)	λ
1	0.5	0.6	0	0	0.796	0.6
2	0.5	0.7	0	0	0.928	0.7
3	0.5	0.8	0	0	1.061	0.8
4	0.5	0.9	0	0	1.194	0.9
5	0.5	1.0	0	0	1.326	1.0
6	0.5	1.1	0	0	1.459	1.1
7	0.5	1.2	0	0	1.592	1.2
8	0.5	1.3	0	0	1.724	1.3
9	0.5	1.4	0	0	1.857	1.4
10	0.5	1.0	0.2	16.7	1.592	1.0
11	0.5	1.0	0.3	23.1	1.724	1.0
12	0.5	1.0	0.4	28.6	1.857	1.0
13	0.5	1.0	0.5	33.3	1.989	1.0
14	0.5	1.0	0.6	37.5	2.122	1.0
15	0.5	1.0	0.7	41.2	2.255	1.0
16	0.5	1.0	0.8	44.4	2.387	1.0
17	0.5	1.0	0.9	47.4	2.520	1.0

图2 反扩散火焰自发辐射光谱曲线图

Fig.2 Inverse diffusion flame photometry graph

图3 不同当量比火焰的OH*辐射强度二维分布

Fig.3 Two-dimensional OH* radiation intensity distribution of flames with different equivalence ratios

图4 当量比为1.0时CO2稀释下的OH*辐射强度分布图

Fig.4 Distribution of OH* radiation intensity under CO2 dilution when the equivalence ratio is 1.0

图5 不同当量比火焰的CH*辐射强度二维分布

Fig.5 Two-dimensional CH* radiation intensity distribution of flames with different equivalence ratios

图6 当量比为1.0时CO2稀释下的CH*辐射强度分布

Fig.6 Distribution of CH* radiation intensity under CO2 dilution when the equivalent ratio is 1.0

图7 CH*和OH*峰值强度随当量比的变化

Fig.7 CH* and OH* peak intensity with different equivalence ratios

图8 CH*和OH*辐射强度峰值位置随当量比的变化

Fig.8 CH* and OH* peak radiation intensity positions with various equivalence ratios

图9 火焰纵横比随氧燃当量比及CO2稀释水平变化

Fig.9 Flame aspect ratio under different oxygen-fuel equivalence ratios and CO2 dilution levels

图10 OH*、CH*火焰面积随氧燃当量比及CO2稀释水平变化

Fig.10 Flame area under different oxygen-fuel equivalence ratios and CO2 dilution levels

参考文献 40

1	顾璠, 黄亚继, 刘道银. 燃烧学基础[M]. 南京: 东南大学出版社, 2019: 156-157.
	Gu F, Huang Y J, Liu D Y. Fundamental Theory of Combustion[M]. Nanjing: Southeast University Press, 2019: 156-157.
2	聂璇, 周魁斌, 吴月琼, 等. 气固射流扩散火焰形态研究[J]. 化工学报, 2021, 72(5): 2878-2886.
	Nie X, Zhou K B, Wu Y Q, et al. Study on the flame shape of gas-solid jet diffusion[J]. CIESC Journal, 2021, 72(5): 2878-2886.
3	刘洁妤, 龚岩, 吴晓翔, 等. 多喷嘴对置式气化炉内颗粒挥发分火焰可视化研究[J]. 化工学报, 2021, 72(3): 1275-1282.
	Liu J Y, Gong Y, Wu X X, et al. Visualization study on particle volatile flame opposed multi-burner impinging entrained-flow gasifier[J]. CIESC Journal, 2021, 72(3): 1275-1282.
4	安振华, 张猛, 毛润泽, 等. 钝体甲烷火焰高掺氢比吹熄机理的大涡模拟[J]. 燃烧科学与技术, 2021, 27(4): 443-450.
	An Z H, Zhang M, Mao R Z, et al. Blow-off mechanism of high hydrogen ratio bluff body methane flame by large eddy simulation[J]. Journal of Combustion Science and Technology, 2021, 27(4): 443-450.
5	Mikofski M A, Williams T C, Shaddix C R, et al. Flame height measurement of laminar inverse diffusion flames[J]. Combustion and Flame, 2006, 146(1/2): 63-72.
6	Li X Y, Dai Z H, Guo Q H, et al. Experimental and numerical study of MILD combustion in a bench-scale natural gas partial oxidation gasifier[J]. Fuel, 2017, 193: 197-205.
7	Xi J F, Yuan Y, Gu Z Z, et al. Effect of CO₂/N₂/CH₄ dilution on NO formation in laminar coflow syngas diffusion flames[J]. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2018, 40(7): 821-829.
8	Gaydon A G. The Spectroscopy of Flames[M]. Dordrecht: Springer, 1974.
9	Li Z S, Li B, Sun Z W, et al. Turbulence and combustion interaction: high resolution local flame front structure visualization using simultaneous single-shot PLIF imaging of CH, OH, and CH₂O in a piloted premixed jet flame[J]. Combustion and Flame, 2010, 157(6): 1087-1096.
10	Walsh K T, Fielding J, Smooke M D, et al. A comparison of computational and experimental lift-off heights of coflow laminar diffusion flames[J]. Proceedings of the Combustion Institute, 2005, 30(1): 357-365.
11	Hardalupas Y, Panoutsos C S, Taylor A M K P. Spatial resolution of a chemiluminescence sensor for local heat-release rate and equivalence ratio measurements in a model gas turbine combustor[J]. Experiments in Fluids, 2010, 49(4): 883-909.
12	Baumgardner M E, Harvey J. Analyzing OH, CH, and C₂* chemiluminescence of bifurcating FREI propane-air flames in a micro flow reactor[J]. Combustion and Flame, 2020, 221: 349-351.
13	Ballester J, Hernández R, Sanz A, et al. Chemiluminescence monitoring in premixed flames of natural gas and its blends with hydrogen[J]. Proceedings of the Combustion Institute, 2009, 32(2): 2983-2991.
14	周莹, 白永辉, 宋旭东, 等. 自由基的化学发光特性在火焰光谱诊断的应用综述[J]. 光谱学与光谱分析, 2020, 40(11): 3358-3364.
	Zhou Y, Bai Y H, Song X D, et al. Application of chemiluminescence in spectral diagnosis: a review[J]. Spectroscopy and Spectral Analysis, 2020, 40(11): 3358-3364.
15	Mahesh S, Mishra D P. Flame structure of LPG-air inverse diffusion flame in a backstep burner[J]. Fuel, 2010, 89(8): 2145-2148.
16	Wang Z Y, Sunderland P B, Axelbaum R L. Double blue zones in inverse and normal laminar jet diffusion flames[J]. Combustion and Flame, 2020, 211: 253-259.
17	Escudero F, Fuentes A, Demarco R, et al. Effects of oxygen index on soot production and temperature in an ethylene inverse diffusion flame[J]. Experimental Thermal and Fluid Science, 2016, 73: 101-108.
18	Zhou Y, Xie F, Yao M, et al. Investigation on stability and chemiluminescence characterization for liftoff inverse diffusion flames[J]. Combustion Science and Technology, 2021. DOI: 10.1080/00102202.2021.1872552 . DOI
19	Zhu H W, Gong Y, He L, et al. Effects of CO and H₂ addition on OH* chemiluminescence characteristics in laminar rich inverse diffusion flames[J]. Fuel, 2019, 254: 115554.
20	Yang J B, Gong Y, Guo Q H, et al. Experimental studies of the effects of global equivalence ratio and CO₂ dilution level on the OH* and CH* chemiluminescence in CH₄/O₂ diffusion flames[J]. Fuel, 2020, 278: 118307.
21	Yang J B, Gong Y, Guo Q H, et al. Dilution effects of N₂ and CO₂ on flame structure and reaction characteristics in CH₄/O₂ flames[J]. Experimental Thermal and Fluid Science, 2019, 108: 16-24.
22	Cho Y T, Na S J. Application of Abel inversion in real-time calculations for circularly and elliptically symmetric radiation sources[J]. Measurement Science and Technology, 2005, 16(3): 878-884.
23	Hardalupas Y, Selbach A. Imposed oscillations and non-premixed flames[J]. Progress in Energy and Combustion Science, 2002, 28(1): 75-104.
24	Karnani S, Dunn-Rankin D. Visualizing CH* chemiluminescence in sooting flames[J]. Combustion and Flame, 2013, 160(10): 2275-2278.
25	张婷. 射流扩散及撞击火焰辐射光谱及火焰结构研究[D]. 上海: 华东理工大学, 2013.
	Zhang T. Investigations on emission spectrum and flame structure of jet diffusion and impinging flames[D]. Shanghai: East China University of Science and Technology, 2013.
26	Lauer M, Sattelmayer T. On the adequacy of chemiluminescence as a measure for heat release in turbulent flames with mixture gradients[J]. Journal of Engineering for Gas Turbines and Power, 2010, 132(6): 061502.
27	Kamal M M. Two-line (CH /CO₂) chemiluminescence technique for equivalence ratio mapping in turbulent stratified flames[J]. Energy, 2020, 192: 116485.
28	Guiberti T F, Durox D, Schuller T. Flame chemiluminescence from CO₂-and N₂-diluted laminar CH₄/air premixed flames[J]. Combustion and Flame, 2017, 181: 110-122.
29	Jakob M, Hülser T, Janssen A, et al. Simultaneous high-speed visualization of soot luminosity and OH chemiluminescence of alternative-fuel combustion in a HSDI diesel engine under realistic operating conditions[J]. Combustion and Flame, 2012, 159(7): 2516-2529.
30	杨家宝, 何磊, 祝慧雯, 等. N₂和CO₂稀释对CH₄/O₂扩散火焰反应区和结构特性的影响[J]. 华东理工大学学报(自然科学版), 2019, 45(6): 853-859.
	Yang J B, He L, Zhu H W, et al. Effects of N₂/CO₂ on the reaction zone and structure characteristics of the CH₄/O₂ diffusion flame[J]. Journal of East China University of Science and Technology, 2019, 45(6): 853-859.
31	Miao J, Leung C W, Cheung C S, et al. Effect of H₂ addition on OH distribution of LPG/air circumferential inverse diffusion flame[J]. International Journal of Hydrogen Energy, 2016, 41(22): 9653-9663.
32	Li Y H, Chen C H, Ilbas M. Effect of diluent addition on combustion characteristics of methane/nitrous oxide inverse tri-coflow diffusion flames[J]. Combustion Science and Technology, 2020. DOI: 10.1080/00102202.2020.1854236 . DOI
33	Chen Y, Wang J F, Zhang X L, et al. The effects of CO₂ additional on flame characteristics in the CH₄/N₂/O₂ counterflow diffusion flame[J]. Molecules, 2021, 26(10): 2905.
34	Shim M, Noh K, Yoon W. Flame structure of methane/oxygen shear coaxial jet with velocity ratio using high-speed imaging and OH, CH chemiluminescence[J]. Acta Astronautica, 2018, 147: 127-132.
35	胡翀赫. 基于气流床气化的扩散及撞击火焰光谱辐射特性研究[D]. 上海:华东理工大学, 2018.
	Hu C H. Study on spectroscopic characteristics in diffusion and impinging flames based on entrained-flow gasifier[D]. Shanghai: East China University of Science and Technology, 2018.
36	Xie F, Zhou Y, Song X D, et al. Investigation of OH chemiluminescence with lift-off characteristic in methane-oxygen inverse diffusion flame[J]. International Journal of Hydrogen Energy, 2021, 46(2): 1461-1472.
37	Kojima J, Ikeda Y, Nakajima T. Basic aspects of OH(A), CH(A), and C₂(d) chemiluminescence in the reaction zone of laminar methane-air premixed flames[J]. Combustion and Flame, 2005, 140(1/2): 34-45.
38	蔡小舒, 季琨, 苏明旭, 等. 基于光谱分析的煤粉火焰复合判据和燃烧诊断研究[J]. 中国电机工程学报, 2004, 24(1): 211-215.
	Cai X S, Ji K, Su M X, et al. The study of pulverized coal combustion diagnosis and flame criterion based on the spectrum analysis[J]. Proceedings of the CSEE, 2004, 24(1): 211-215.
39	Muruganandam T M, Nair S, Scarborough D, et al. Active control of lean blowout for turbine engine combustors[J]. Journal of Propulsion and Power, 2005, 21(5): 807-814.
40	Ko Y C, Hou S S, Lin T H. Laminar diffusion flames in a multiport burner[J]. Combustion Science and Technology, 2005, 177(8): 1463-1484.

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CO₂稀释对甲烷反扩散火焰结构的影响研究

Effects of CO₂ dilution on the structure of methane inverse diffusion flame

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