ANALYSIS OF MIXED COMBUSTION CHARACTERISTICS AND EMISSIONS OF HYDROGEN AND NATURAL GAS UNDER MILD CONDITIONS

Teng Lin; Li Xigui; Wu Yue; Liu Bin; Wang Lan; Li Weidong

doi:10.19912/j.0254-0096.tynxb.2021-0294

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (10) : 465-471. DOI: 10.19912/j.0254-0096.tynxb.2021-0294

ANALYSIS OF MIXED COMBUSTION CHARACTERISTICS AND EMISSIONS OF HYDROGEN AND NATURAL GAS UNDER MILD CONDITIONS

Teng Lin¹, Li Xigui¹, Wu Yue², Liu Bin², Wang Lan², Li Weidong¹

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Abstract

To address the using problem that the combustion efficiency and Nitrogen Oxides （NO_x） emission of Natural Gas （NG） after hydrogen doping （H₂） are less studied, using the component transport model, Eddy Dissipation Concept （EDC） combustion model and Do radiation model, at same time combining with the GRI-22 chemical reaction mechanism, to establish a soft （MILD, moderate or intense low oxygen dilution） combustion simulation model is established. The reliability of the model is verified by comparing it with the experimental results, and the model is further applied to analyze the effects of different hydrogen doping ratios on the combustion characteristics. The results show that with the increase of hydrogen doping ratio, the mixing degree of fuel and oxidant gradually increases, and the radial component of mixed gas decreases; due to the increase of reaction rate and exothermic rate, the temperature inside the burner increases, and the thermal NO_x content increases, mainly concentrated in the back end of the burner; the increase of fuel inlet speed leads to incomplete combustion inside the burner, the temperature at the outlet decreases, the oxygen concentration increases and the NO_x content decreases. It is found that hydrogen blending in natural gas is more favorable to achieve MILD combustion conditions.

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Teng Lin, Li Xigui, Wu Yue, Liu Bin, Wang Lan, Li Weidong. ANALYSIS OF MIXED COMBUSTION CHARACTERISTICS AND EMISSIONS OF HYDROGEN AND NATURAL GAS UNDER MILD CONDITIONS[J]. Acta Energiae Solaris Sinica. 2022, 43(10): 465-471 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0294

References

[1] 冯文, 王淑娟, 倪维斗, 等. 氢能的安全性和燃料电池汽车的氢安全问题[J]. 太阳能学报, 2003(5): 677-82.
FENG W,WANG S J, NI W D, et al.The safety of hydrogen energy and fuel cell vehicles[J]. Acta energiae solaris sinica, 2003(5): 677-82.
[2] KOVAČ A, PARANOS M, MARCIUŠ D.Hydrogen in energy transition: a review[J]. International journal of hydrogen energy, 2021, 46(16): 10016-10035.
[3] CASTELLO P, TZIMAS E, MORETTO P.Techno-economic assessment of hydrogen transmission & distribution systems in Europe in the medium and long term[J]. Agricultural water management, 2015, 104(2): 53-58.
[4] ALIYU M, NEMITALLAH M A, SAID S A, et al.Characteristics of H₂-enriched CH₄O₂ diffusion flames in a swirl-stabilized gas turbine combustor: experimental and numerical study[J]. International journal of hydrogen energy, 2016, 41(44): 20418-20432.
[5] SEPMAN A, ABTAHIZADEH E, MOKHOV A, et al.Experimental and numerical studies of the effects of hydrogen addition on the structure of a laminar methane-nitrogen jet in hot coflow under MILD conditions[J]. International journal of hydrogen energy, 2013, 38(31): 13802-13811.
[6] FAN B W,PAN J F, LIU Y X, et al.Effect of hydrogen injection strategies on mixture formation and combustion process in a hydrogen direct injection plus natural gas port injection rotary engine[J]. Energy conversion and management,2018,160: 150-164.
[7] FAN B W,ZHANG Y Y, PAN J F, et al.The influence of hydrogen injection strategy on mixture formation and combustion process in a port injection (PI) rotary engine fueled with natural gas/hydrogen blends[J]. Energy conversion and management, 2018, 173: 527-538.
[8] ZAREEI J, ROHANI A, WAN MAHMOOD W M F. Simulation of a hydrogen/natural gas engine and modelling of engine operating parameters[J]. International journal of hydrogen energy, 2018, 43(25):11639-11651.
[9] YU G, LAW C K, WU C K.Laminar flame speeds of hydrocarbon+air mixtures with hydrogen addition[J]. Combustion and flame, 1986, 63(3): 339-347.
[10] 刘晓东. 常温空气MILD燃烧的实验研究与火焰面模型的模拟[D]. 武汉: 华中科技大学, 2011: 1-82.
LIU X D.Experiments Study and flamelet model simnulations on MILD combustion under normal temperature air[D]. Wuhan: Huazhong University of Science & Techology, 2011: 1-82.
[11] TU Y J, XU S T, XIE M Q, et al.Numerical simulation of propane MILD combustion in a lab-scale cylindrical furnace[J]. Fuel, 2021, 290:119858.
[12] TU Y J, YANG W M, SIAH K B, et al.A comparative study of methane MILD combustion in O₂/N₂, O₂/CO₂ and O₂/H₂O[J]. Energy procedia, 2019, 158: 1473-1478.
[13] DALLY B B, KARPETIS A N, BARLOW R S.Structure of turbulent non-premixed jet flames in a diluted hot coflow[J]. Proceedings of the combustion institute, 2002, 29(1): 1147-1154.
[14] CHRISTO F C, DALLY B B.Modeling turbulent reacting jets issuing into a hot and diluted coflow[J]. Combustion and flame, 2005, 142(1): 117-129.
[15] KAZAKOV A F M. Reduced reaction sets based on GRIMech 1.2[M].
[16] 王锋. 甲烷富氧分段燃烧NO_x排放特性的数值模拟[D].重庆: 重庆大学, 2009: 1-118.
WANG F.Numerical simulation for NO_x emission characteristic of methane’s oxygen-enriched and staged combustion[D]. Chongqing: Chongqing University, 2009: 1-118.
[17] 朱锡锋, VENDERBOSCH R, 王俊三. 燃料理论空燃比与高位热值之间的关系[J]. 中国科学技术大学学报, 2004(1): 114-118.
ZHU X F,VENDERBOSCH R, WANG J S.Correlation between stoichiometrical ratio of air to fuel and its higher heating value[J]. Journal of Universities of Science and Technology of China, 2004(1): 114-118.
[18] 王国昌, 舒子云, 司济沧, 等. 二氧化碳、水和氮气稀释条件下甲烷MILD氧燃烧的实验研究[J]. 中国电机工程学报, 2020(18): 6312-6320.
WANG G C, SHU Z Y, SI J C, et al.Experimental investigation on MILD oxy-combustion of methane under CO₂, H₂O and N₂ dilution[J]. Proceedings of the CSEE,2020.
[19] MARDANI A, KARIMI M M H. Hydrogen enrichment of methane and syngas for MILD combustion[J]. International journal of hydrogen energy, 2019, 44(18): 9423-9437.
[20] AMINIAN J, GALLETTI C, SHAHHOSSEINI S, et al.Numerical investigation of a MILD combustion burner: analysis of mixing field, chemical kinetics and turbulence-chemistry interaction[J]. Flow, turbulence and combustion, 2012, 88(4): 597-623.
[21] DE A, DONGRE A.Assessment of turbulence-chemistry interaction models in MILD combustion regime[J]. Flow, turbulence and combustion, 2015, 94(2): 439-4378.
[22] DE A, OLDENHOF E, SATHIAH P, et al.Numerical simulation of Delft-Jet-in-Hot-Coflow (DJHC) flames using the Eddy Dissipation Concept model for turbulence-chemistry interaction[J]. Flow, turbulence and combustion, 2011, 87(4): 537-5367.
[23] EVANS M J, MEDWELL P R, TIAN Z F.Modeling lifted jet flames in a heated coflow using an optimized eddy dissipation concept model[J]. Combustion science and technology, 2015, 187(7): 1093-1109.
[24] MEDWELL P R, KALT P A M, DALLY B B. Simultaneous imaging of OH, formaldehyde, and temperature of turbulent nonpremixed jet flames in a heated and diluted coflow[J]. Combustion and flame, 2007, 148(1): 48-61.
[25] NAJM H N, PAUL P H, MUELLER C J, et al.On the adequacy of certain experimental observables as measurements of flame burning rate[J]. Combustion and flame, 1998, 113(3): 312-332.
[26] SAGAR S M V, AGARWAL A K. Knocking behavior and emission characteristics of a port fuel injected hydrogen enriched compressed natural gas fueled spark ignition engine[J]. Applied thermal engineering, 2018, 141: 42-50.
[27] TANGOZ S, KAHRAMAN N, AKANSU S O.The effect of hydrogen on the performance and emissions of an SI engine having a high compression ratio fuelled by compressed natural gas[J]. International journal of hydrogen energy, 2017, 42(40): 25766-25780.