Prediction of MILD Combustion Characteristics and NOx Formation for Ammonia Conversion and Flue Gas Recirculation

Jiho Yu; Jongsup Hong; Youngjae Lee

doi:10.15231/jksc.2023.28.2.001

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2023 Vol.28, Issue 2 Next Page

Research Article

Prediction of MILD Combustion Characteristics and NOx Formation for Ammonia Conversion and Flue Gas Recirculation 암모니아 전환 및 배가스 재순환에 따른 MILD 연소 특성 및 NOx 생성에 대한 예측 연구

30 June 2023. pp. 1-10

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Abstract

Many researchers are encouraging efforts to reduce greenhouse gas emissions. To achieve this, it is necessary to reduce the use of hydrocarbon-based fuels or switch to carbon-free fuels. Ammonia can be one of transport methods of hydrogen. Transported ammonia can be used to extract hydrogen through decomposition or directly as a fuel. The purpose of this study is to nummerically analyze the MILD combustion characteristics and NOx emission of hydrogen-ammonia-nitrogen mixtures. Numerical simulations were performed by 0D Homogeneous model and 1D OPPDIF model of Chemkin. The target fuel was assumed to be the tail gas generated by the ammonia decomposition, and the composition of fuels was defined through the ammonia conversion rate(CR) of 0-100%. The results showed that MILD combustion was achieved when the flue gas recirculation rate was increased or the ammonia content was high. As the recirculation rate increased, the region of maximum heat release rate merged into one. Moreover, the NO emission decreased while the N₂O emission increased. This means that NO and N₂O are formed by the routes of Thermal NOx and Fuel NOx, respectively. A future work will include experimental studies of MILD combustion characteristics in terms of ammonia content in a lab-scale MILD combustion system.

Keywords

MILD combustion

Ammonia conversion

Flue gas recirculation

Low NOx

Numerical analysis

References

United Nations Framework Convention on Climate Change (UNFCCC), 2021, NDC registry.

Joint of Ministry concerned, 2021, Update of 2030 Nationally Determined Contribution(NDC).

Ministry of Trade, Industry and Energy(MOTIE), 2021, Achievements of the Hydrogen Economy and Vision for Leading Hydrogen Nations.

Joint of Ministry concerned, 2021, 2050 Carbon Neutral Scenario.

A. Klerke, C. H. Christensen, J. K. Nørskov, T. Vegge, Ammonia for hydrogen storage: challenges and opportunities, J. Mater. Chem., 18 (2008), 2304-2310. 10.1039/b720020j

H. Kobayashi, A. Hayakawa, K. K. A. Somarathne, E. C. Okafor, Science and technology of ammonia combustion, Proc. Combust. Inst., 37(1) (2019), 109-133. 10.1016/j.proci.2018.09.029

A. Cavaliere, M. de Joannon, Mild combustion, Prog. Energy Combust. Sci., 30(4) (2004), 329-366. 10.1016/j.pecs.2004.02.003

P. Bozza, "Development of a fuel flexible, high efficiency combustion unit, University of Naples Federico II Ph. D thesis, 2017.

W. S. Chai, Y. Bao, P. Jin, G. Tang, L. Zhou, A review on ammonia, ammonia-hydrogen and ammonia-methane fuels, Renew. Sustain. Energy Rev., 147 (2021), 11254. 10.1016/j.rser.2021.111254

J. Li, H. Huang, N. Kobayashi, Z. He, Y. Nagai, Study on using hydrogen and ammonia as fuels: Combustion characteristics and NOx formation, Int. J. Energy Res., 38 (2014), 1214-1223. 10.1002/er.3141

J. Otomo, M. Koshi, T. Mitsumori, H. Iwasaki, K, Yamada, Chemical kinetic modeling of ammonia oxidation with improved reaction mechanism for ammonia/air and ammonia/hydrogen/air combustion, Int. J. Hydrog. Energy, 43(5) (2018), 3004-3014. 10.1016/j.ijhydene.2017.12.066

A. Hayakawa, Y. Arakawa, R Mimoto, K. K. A. Somarathne, T. Kudo, H. Kobayashi, Experimental investigation of stabilization and emission characteristics of ammonia/air premixed flames in a swirl combustor, Int. J. Hydrog. Energy, 42(19) (2017), 14010-14018. 10.1016/j.ijhydene.2017.01.046

P. Li, J. Mi, B. B. Dally, F. Wang, L. Wang, Z. Liu, S. Chen, C. Zheng, Progress and recent trend in MILD combustion, Sci. China Technol. Sci., 54 (2011), 255-269. 10.1007/s11431-010-4257-0

R.J. Kee, J. A. Miler, G. H. Evans, G.D. Lewis, A computational model of the structure and extinction of strained, opposed flow, premixed methane-air flames, Symp. (Int.) Combust., 22(1) (1989), 1479- 1494. 10.1016/S0082-0784(89)80158-4

J. Park, D. Kim, Y. Lee, Experimental study on flameless combustion and NO emission with hydrogen-containing fuels, Int. J. Energy Res., 46(3) (2022), 2512-2528. 10.1002/er.7324

R. Li, A. A. Konnov, G. He, F. Qin, D. Zhang, Chemical mechanism development and reduction for combustion of NH3/H2/CH4 mixtures, Fuel, 257 (2019), 116059. 10.1016/j.fuel.2019.116059

J.A.Wünning, J.G.Wünning, Flameless oxidation to reduce thermal no-formation, Prog. Energy Combust. Sci., 23(1) (1997), 81-94. 10.1016/S0360-1285(97)00006-3

ANSYS Chemkin Theory Manual 17.0 (15151), Reaction Design: San Diego, 2015.

V. Vukadinovic, P. Habisreuther, N. Zarzalis, Experimental study on combustion characteristics of conventional and alternative liquid fuels, J. Eng. Gas Turbines Power, 134(12) (2012), 121504. 10.1115/1.4007333

G. Sorrentino, A. Cavaliere, P. Sabia, R. Ragucci, M. de Joannon, Diffusion Ignition Processes in MILD Combustion: A Mini-Review, Front. Mech. Eng., 6 (2020). 10.3389/fmech.2020.00010

M. de Joannon, P. Sabia, G. Cozzolino, A. Cavaliere, Pyrolitic and Oxidative Structures in Hot Oxidant Diluted Oxidant (HODO) MILD Combustion, Combust. Sci. Technol., 184(7-8) (2012), 1207-1218. 10.1080/00102202.2012.664012

S. Mashruk, E. C. Okafor, M. Kovaleva, A. Alnasif, D. Pugh, A. Hayakawa, A. V. Medina, Evolution of N₂O production at lean combustion condition in NH3/H2/air premixed swirling flames, Combust. Flame, 244 (2022), 112299. 10.1016/j.combustflame.2022.112299

C. Duynslaegher, F. Contico, J. Vandooren, H. Jeanmart, Modeling of ammonia combustion at low pressure, Combust. Flame, 159(9) (2012), 2799-2805. 10.1016/j.combustflame.2012.06.003

H. Nozari, A. Karabeyoğlu, Numerical study of combustion characteristics of ammonia as a renewable fuel and establishment of reduced reaction mechanisms, Fuel, 159 (2015), 223-233. 10.1016/j.fuel.2015.06.075

J. H. Lee, J. H. Kim, J. H. Park, O. C. Kwon, Studies on properties of laminar premixed hydrogen-added ammonia/air flames for hydrogen production, Int. J. Hydrog. Energy, 35(3) (2010), 1054-1064. 10.1016/j.ijhydene.2009.11.071

A. Mohammadpour, K. Mazaheri, A. Alipoor, Reaction zone characteristics, theramal performance and NOx/N₂O emissions analyses of ammonia MILD combustion, Int. J. Hydrog. Energy, 47(48) (2022), 21013-21031. 10.1016/j.ijhydene.2022.04.190

Information

Publisher :The Korean Society Combustion
Publisher(Ko) :한국연소학회
Journal Title :Journal of The Korean Society Combustion
Journal Title(Ko) :한국연소학회지
Volume : 28
No :2
Pages :1-10
Received Date : 2023-02-28
Revised Date : 2023-03-03
Accepted Date : 2023-03-29
DOI :https://doi.org/10.15231/jksc.2023.28.2.001

Journal of The Korean Society Combustion ISSN:1226-0959(Print) 2466-2089(Online) 한국연소학회지

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