Effect of Dimethyl Ether on Ignition Characteristics of Ammonia and Chemical Kinetics

被引：0

作者：

Jin Y. ^{[1
]}

Ma Z. ^{[1
]}

Wang X. ^{[1
]}

Li X. ^{[1
]}

Chu X. ^{[1
]}

机构：

[1] Vehicle and Transportation Engineering College, Henan University of Science and Technology, Luoyang

来源：

Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | 2024年 / 42卷 / 03期

关键词：

ammonia; chemical kinetics; dimethyl ether; ignition delay time; shock tube;

D O I：

10.16236/j.cnki.nrjxb.202403028

中图分类号：

学科分类号：

摘要：

The contribution of dimethyl ether(DME)to the ammonia(NH3)ignition delay time was investigated on a reflected shock wave equipment. The experiments were performed at a pressure of 0.14/1.00 MPa，temperature range of 1 150—1 950 K，equivalence ratio of 0.5/1.0/2.0，and NH3/DME mixing ratios of 100/0，95/5，90/10 and 70/30，respectively. The experimental results show that the addition of DME decreases the ignition delay time and promotes the reactivity of NH3. With DME blending，the effect of equivalence ratio on the NH3 ignition delay time is decreased，and with an increase in temperature and pressure，the effect of DME on promoting NH3 ignition is weakened. An updated mechanism was proposed to quantify DME-promoted NH3 ignition. The experimental data was validated with literature mechanisms，and the results were in line with the experimental trends under all conditions. Chemical kinetic analyses were performed to interpret the interactions between DME and NH3 for fuel ignition. Numerical analysis indicates that the promotion effect of DME is mainly due to the increase in the rate and concentration of the radical pool，especially the OH radical pool. The large number of OH radicals generated by the reaction HO2＋CH3＝OH＋CH3O during the early oxidation of DME are the key to the consumption of NH3 and the early initiation of the chain reaction. © 2024 Chinese Society for Internal Combustion Engines. All rights reserved.

引用

页码：236 / 244

页数：8

共 28 条

[1] Giddey S，, Badwal S P S，, Munnings C，, Et al., Ammonia as a renewable energy transportation media[J], ACS Sustainable Chemistry & Engineering, 5, 11, pp. 10231-10239, (2017)
[2] Chiuta S，, Everson R C，, Neomagus H W J P，, Et al., Reactor technology options for distributed hydrogen generation via ammonia decomposition：A review[J], International Journal of Hydrogen Energy, 38, 35, pp. 14968-14991, (2013)
[3] Valera-Medina A，Amer-Hatem F，Azad A K，et al. Review on ammonia as a potential fuel：From synthesis to economics[J], Energy & Fuels, 35, 9, pp. 6964-7029, (2021)
[4] Konnov A A., Implementation of the NCN pathway of prompt-NO formation in the detailed reaction mechanism[J], Combustion and Flame, 156, 11, pp. 2093-2105, (2009)
[5] Glarborg P，, Miller J A，, Ruscic B，, Et al., Modeling nitrogen chemistry in combustion[J], Progress in Energy and Combustion Science, 67, pp. 31-68, (2018)
[6] Pochet M, ，Dias V，Moreau B，et al. Experimental and numerical study，under LTC conditions，of ammonia ignition delay with and without hydrogen addition[J], Proceedings of the Combustion Institute, 37, 1, pp. 621-629, (2019)
[7] Otomo J，, Koshi M，, Mitsumori T，, Et al., Chemical kinetic modeling of ammonia oxidation with improved reaction mechanism for ammonia/air and ammonia/hydrogen/air combustion[J], International Journal of Hydrogen Energy, 43, 5, pp. 3004-3014, (2018)
[8] Dai L，, Gersen S，, Glarborg P，, Et al., Autoignition studies of NH3/CH4 mixtures at high pressure[J], Combustion and Flame, 218, pp. 19-26, (2020)
[9] 41, 1, pp. 1-8
[10] Petersen E L., Experimental and modeling study on the high-temperature oxidation of ammonia and related NOx chemistry[J], Combustion and Flame, 162, 3, pp. 554-570, (2015)

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