Experimental and kinetic modeling study on NH3/syngas/air and NH3/bio-syngas/air premixed laminar flames at elevated temperature

Shangkun Zhou; Wenjun Yang; Houzhang Tan; Qiwei An; Jinhua Wang; Hongchao Dai; Xiaoxiao Wang; Xuebin Wang; Shuanghui Deng

doi:10.1016/j.combustflame.2021.111594

Experimental and kinetic modeling study on NH₃/syngas/air and NH₃/bio-syngas/air premixed laminar flames at elevated temperature

Shangkun Zhou
, Wenjun Yang
, Houzhang Tan
, Qiwei An
, Jinhua Wang
, Hongchao Dai
, Xiaoxiao Wang
, Xuebin Wang
, Shuanghui Deng

School of Energy and Power Engineering

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

103 Scopus citations

Abstract

Ammonia (NH₃) can help achieve large-scale storage and long-distance transportation of renewable energy. The co-firing of NH₃ with syngas and bio-syngas and increasing the initial temperature of reactants are economical and effective methods to enhance the reactivity of NH₃ flames in boilers and gas turbines. An accurate kinetic model is essential for developing corresponding burners. The current kinetic models are not accurate enough in temperature dependence. Laminar burning velocities (S_L) of NH₃/syngas/air and NH₃/bio-syngas/air mixtures were measured at various H₂ contents in syngas and NH₃ contents in the mixtures, equivalence ratios of 0.7~1.4, atmospheric pressure, and elevated temperature up to 423 K in a high-pressure constant-volume combustion vessel. A detailed kinetic model was developed for NH₃/syngas combustion and validated based on the literature data. The experimental results show that slightly rich flame, high mole fractions of syngas/bio-syngas, and elevated initial temperature contribute to increasing the S_L. Kinetic modeling analysis was performed for interpreting the effect of fuel composition, equivalence ratio and initial temperature on the laminar flame propagation characteristics. The elevated H₂ content in syngas provides a stronger chemical effect and the enhanced laminar flame propagation of NH₃/syngas/air and NH₃/bio-syngas/air mixtures is dominated by chemical effect. Due to the presence of diluent (CO₂ and N₂), thermal effect has a negative influence on the enhancement of NH₃/bio-syngas/air flame propagation. Although diluent hardly changes the NH₃ consumption pathways, it will significantly reduce the NH₃ consumption. Different NH₃ consumption pathways are preferred by lean and rich flame. Sensitivity analysis shows that NH₂ chemistry is favored by rich flames. Since NH₂ + NH = N₂H₂ + H promotes the production of H radical in rich flames, it has the greatest influence on the S_L of rich flames. H₂ is more capable of improving the temperature dependence of NH₃/syngas/air flame than CO. The increased importance of NH₃ chemistry accounts for the strong temperature dependence of NH₃/bio-syngas/air flame.

Original language	English
Article number	111594
Journal	Combustion and Flame
Volume	233
DOIs	https://doi.org/10.1016/j.combustflame.2021.111594
State	Published - Nov 2021

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Ammonia/bio-syngas flame
Ammonia/syngas flame
Elevated temperature
Kinetic modeling
Laminar burning velocity
Temperature dependence

Access to Document

10.1016/j.combustflame.2021.111594

Cite this

@article{447854baf0a24577b52d9f6ac6e63770,

title = "Experimental and kinetic modeling study on NH3/syngas/air and NH3/bio-syngas/air premixed laminar flames at elevated temperature",

abstract = "Ammonia (NH3) can help achieve large-scale storage and long-distance transportation of renewable energy. The co-firing of NH3 with syngas and bio-syngas and increasing the initial temperature of reactants are economical and effective methods to enhance the reactivity of NH3 flames in boilers and gas turbines. An accurate kinetic model is essential for developing corresponding burners. The current kinetic models are not accurate enough in temperature dependence. Laminar burning velocities (SL) of NH3/syngas/air and NH3/bio-syngas/air mixtures were measured at various H2 contents in syngas and NH3 contents in the mixtures, equivalence ratios of 0.7\textasciitilde{}1.4, atmospheric pressure, and elevated temperature up to 423 K in a high-pressure constant-volume combustion vessel. A detailed kinetic model was developed for NH3/syngas combustion and validated based on the literature data. The experimental results show that slightly rich flame, high mole fractions of syngas/bio-syngas, and elevated initial temperature contribute to increasing the SL. Kinetic modeling analysis was performed for interpreting the effect of fuel composition, equivalence ratio and initial temperature on the laminar flame propagation characteristics. The elevated H2 content in syngas provides a stronger chemical effect and the enhanced laminar flame propagation of NH3/syngas/air and NH3/bio-syngas/air mixtures is dominated by chemical effect. Due to the presence of diluent (CO2 and N2), thermal effect has a negative influence on the enhancement of NH3/bio-syngas/air flame propagation. Although diluent hardly changes the NH3 consumption pathways, it will significantly reduce the NH3 consumption. Different NH3 consumption pathways are preferred by lean and rich flame. Sensitivity analysis shows that NH2 chemistry is favored by rich flames. Since NH2 + NH = N2H2 + H promotes the production of H radical in rich flames, it has the greatest influence on the SL of rich flames. H2 is more capable of improving the temperature dependence of NH3/syngas/air flame than CO. The increased importance of NH3 chemistry accounts for the strong temperature dependence of NH3/bio-syngas/air flame.",

keywords = "Ammonia/bio-syngas flame, Ammonia/syngas flame, Elevated temperature, Kinetic modeling, Laminar burning velocity, Temperature dependence",

author = "Shangkun Zhou and Wenjun Yang and Houzhang Tan and Qiwei An and Jinhua Wang and Hongchao Dai and Xiaoxiao Wang and Xuebin Wang and Shuanghui Deng",

note = "Publisher Copyright: {\textcopyright} 2021",

year = "2021",

month = nov,

doi = "10.1016/j.combustflame.2021.111594",

language = "英语",

volume = "233",

journal = "Combustion and Flame",

issn = "0010-2180",

publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Experimental and kinetic modeling study on NH3/syngas/air and NH3/bio-syngas/air premixed laminar flames at elevated temperature

AU - Zhou, Shangkun

AU - Yang, Wenjun

AU - Tan, Houzhang

AU - An, Qiwei

AU - Wang, Jinhua

AU - Dai, Hongchao

AU - Wang, Xiaoxiao

AU - Wang, Xuebin

AU - Deng, Shuanghui

PY - 2021/11

Y1 - 2021/11

N2 - Ammonia (NH3) can help achieve large-scale storage and long-distance transportation of renewable energy. The co-firing of NH3 with syngas and bio-syngas and increasing the initial temperature of reactants are economical and effective methods to enhance the reactivity of NH3 flames in boilers and gas turbines. An accurate kinetic model is essential for developing corresponding burners. The current kinetic models are not accurate enough in temperature dependence. Laminar burning velocities (SL) of NH3/syngas/air and NH3/bio-syngas/air mixtures were measured at various H2 contents in syngas and NH3 contents in the mixtures, equivalence ratios of 0.7~1.4, atmospheric pressure, and elevated temperature up to 423 K in a high-pressure constant-volume combustion vessel. A detailed kinetic model was developed for NH3/syngas combustion and validated based on the literature data. The experimental results show that slightly rich flame, high mole fractions of syngas/bio-syngas, and elevated initial temperature contribute to increasing the SL. Kinetic modeling analysis was performed for interpreting the effect of fuel composition, equivalence ratio and initial temperature on the laminar flame propagation characteristics. The elevated H2 content in syngas provides a stronger chemical effect and the enhanced laminar flame propagation of NH3/syngas/air and NH3/bio-syngas/air mixtures is dominated by chemical effect. Due to the presence of diluent (CO2 and N2), thermal effect has a negative influence on the enhancement of NH3/bio-syngas/air flame propagation. Although diluent hardly changes the NH3 consumption pathways, it will significantly reduce the NH3 consumption. Different NH3 consumption pathways are preferred by lean and rich flame. Sensitivity analysis shows that NH2 chemistry is favored by rich flames. Since NH2 + NH = N2H2 + H promotes the production of H radical in rich flames, it has the greatest influence on the SL of rich flames. H2 is more capable of improving the temperature dependence of NH3/syngas/air flame than CO. The increased importance of NH3 chemistry accounts for the strong temperature dependence of NH3/bio-syngas/air flame.

AB - Ammonia (NH3) can help achieve large-scale storage and long-distance transportation of renewable energy. The co-firing of NH3 with syngas and bio-syngas and increasing the initial temperature of reactants are economical and effective methods to enhance the reactivity of NH3 flames in boilers and gas turbines. An accurate kinetic model is essential for developing corresponding burners. The current kinetic models are not accurate enough in temperature dependence. Laminar burning velocities (SL) of NH3/syngas/air and NH3/bio-syngas/air mixtures were measured at various H2 contents in syngas and NH3 contents in the mixtures, equivalence ratios of 0.7~1.4, atmospheric pressure, and elevated temperature up to 423 K in a high-pressure constant-volume combustion vessel. A detailed kinetic model was developed for NH3/syngas combustion and validated based on the literature data. The experimental results show that slightly rich flame, high mole fractions of syngas/bio-syngas, and elevated initial temperature contribute to increasing the SL. Kinetic modeling analysis was performed for interpreting the effect of fuel composition, equivalence ratio and initial temperature on the laminar flame propagation characteristics. The elevated H2 content in syngas provides a stronger chemical effect and the enhanced laminar flame propagation of NH3/syngas/air and NH3/bio-syngas/air mixtures is dominated by chemical effect. Due to the presence of diluent (CO2 and N2), thermal effect has a negative influence on the enhancement of NH3/bio-syngas/air flame propagation. Although diluent hardly changes the NH3 consumption pathways, it will significantly reduce the NH3 consumption. Different NH3 consumption pathways are preferred by lean and rich flame. Sensitivity analysis shows that NH2 chemistry is favored by rich flames. Since NH2 + NH = N2H2 + H promotes the production of H radical in rich flames, it has the greatest influence on the SL of rich flames. H2 is more capable of improving the temperature dependence of NH3/syngas/air flame than CO. The increased importance of NH3 chemistry accounts for the strong temperature dependence of NH3/bio-syngas/air flame.

KW - Ammonia/bio-syngas flame

KW - Ammonia/syngas flame

KW - Elevated temperature

KW - Kinetic modeling

KW - Laminar burning velocity

KW - Temperature dependence

UR - https://www.scopus.com/pages/publications/85111883400

U2 - 10.1016/j.combustflame.2021.111594

DO - 10.1016/j.combustflame.2021.111594

M3 - 文章

AN - SCOPUS:85111883400

SN - 0010-2180

VL - 233

JO - Combustion and Flame

JF - Combustion and Flame

M1 - 111594

ER -