First and second thermodynamic-law comparison of biogas MILD oxy-fuel combustion moderated by CO2 or H2O

Liu, Yaming; Chen, Sheng; Yang, Bo; Liu, Kai; Chen, Zheng

doi:10.1016/j.enconman.2015.09.076

Cited by 43 publications

(18 citation statements)

References 29 publications

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“…As in the 267 oxy-steam condition the "flame" front is closer to the fuel jet nozzle, it is eas-268 ier to establish the MILD oxyfuel regime in H 2 O-dilution atmosphere. This 269 conclusion agrees with that drawn from its counterflow counterpart [1]. Figure 270 7 plots the maximum of OH concentration at various f o2 .…”

supporting

confidence: 80%

“…It mainly results from that 233 the mass specific heat capacity of H 2 O is larger than CO 2 . Furthermore, the 234 dilution gas may alter reaction paths by different ways, especially in relation 235 to dissociation reactions, which also will influence heat release in combustion, 236 as discussed in our previous studies [1,12,19]. As shown in our latest work [1] an open question and we will try to answer it in our future work.…”

mentioning

confidence: 92%

“…Furthermore, the 234 dilution gas may alter reaction paths by different ways, especially in relation 235 to dissociation reactions, which also will influence heat release in combustion, 236 as discussed in our previous studies [1,12,19]. As shown in our latest work [1] an open question and we will try to answer it in our future work. As in the 267 oxy-steam condition the "flame" front is closer to the fuel jet nozzle, it is eas-268 ier to establish the MILD oxyfuel regime in H 2 O-dilution atmosphere.…”

mentioning

confidence: 92%

“…These phenomena are expected as combustion will be 220 enhanced with more oxygen. Meanwhile, the differences between them are al- above the ignition temperature of methane, so the reactants react in the MILD 229 oxyfuel regime [1,25]. The peak temperature in O 2 /CO 2 condition is always 230 higher than its steam counterpart.…”

mentioning

confidence: 99%

“…The mass fraction of reactants is also listed in the 162 Table. As the present study aims at the effects of temperature and oxygen in the co-flow 6% ≤ f o2 ≤ 18%). Through a numerical test, it is found that 167 reactants can not be ignited successfully if oxygen mass fraction in the co-flow 168 is lower than 6% or the temperature of the co-flow is less than 1500 K. It is an 169 obvious difference from the air MILD combustion [20] and it may result from 170 two aspects: (1) there is no hydrogen addition in the present fuel flow while 171 hydrogen is more active than methane to establish and to sustain combustion;…”

mentioning

confidence: 99%

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Methane combustion in MILD oxyfuel regime: Influences of dilution atmosphere in co-flow configuration

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supporting

confidence: 80%

mentioning

confidence: 92%

mentioning

confidence: 92%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Methane combustion in MILD oxyfuel regime: Influences of dilution atmosphere in co-flow configuration

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Quantitative and qualitative analysis of thermodynamic process of a bi‐fuel compressed natural gas spark ignition engine

Sahoo

Srivastava

2021

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A comparative energy and exergy analysis was experimentally performed using a bi-fuel compressed natural gas (CNG) spark ignition engine. The experiments were conducted for gasoline and CNG fuel at 1700 rpm and different operating loads from 5 to 30 Nm. The experiments were performed under stoichiometric air-fuel ratio and maximum brake torque ignition timing. Quantitative and qualitative analysis were conducted using the first and second law of thermodynamics, respectively. The effect of engine operating load on various energy and exergy parameters was compared for both the fuels. Output energy with respect to engine load was found higher for CNG compared to gasoline. Engine wall heat transfer was also higher in the CNG engine case due to its high combustion chamber temperature and lower burning velocity.The difference in heat transfer energy fraction between gasoline and CNG gradually increased with engine load. The exhaust energy was found maximum in the case of CNG under low operating load and reduced to a minimum at higher engine operating load. The unaccounted energy fraction was found lower for the CNG engine and reduced with respect to engine load. CNG exhibits the highest exergy efficiency (26.80%) compared to gasoline (25.50%) at 30 Nm load. On average, a 2% higher exergy efficiency was observed with the CNG engine at all operating load conditions. This indicates CNG has a higher potential to convert chemical energy present in the fuel into useful work output. CNG shows lower exergy destruction at all operating loads compared to gasoline, and it reduces significantly at higher engine loads. In all operating loads, exergy transfer due to exhaust gas and heat transfer to the wall was higher in the case of CNG.

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Effect of Hydrogen Enrichment on Pollutant and Greenhouse Gases Formation and Exergy Efficiency of Methane MILD Combustion

Khanlari

Salavati-Zadeh

Mohammadi

et al. 2019

Green Energy and Technology

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First and second thermodynamic-law comparison of biogas MILD oxy-fuel combustion moderated by CO2 or H2O

Cited by 43 publications

References 29 publications

Methane combustion in MILD oxyfuel regime: Influences of dilution atmosphere in co-flow configuration

Methane combustion in MILD oxyfuel regime: Influences of dilution atmosphere in co-flow configuration

Quantitative and qualitative analysis of thermodynamic process of a bi‐fuel compressed natural gas spark ignition engine

Effect of Hydrogen Enrichment on Pollutant and Greenhouse Gases Formation and Exergy Efficiency of Methane MILD Combustion

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