Evaluation of flamelet-based partially premixed combustion models for simulating the gas phase combustion of a grate firing biomass furnace

Sakib, A H M Nazmush; Farokhi, Mohammadreza; Birouk, Madjid

doi:10.1016/j.fuel.2022.126343

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…Like the realizable k − ε model, the RNG k − ε model is also derived from the standard k − ε model [49]. Due to its simplified Reynolds stress model assumption, the RNG k − ε model lacks a suitable prediction of the turbulence length/time scale [50,51]. The RNG k − ε model uses a formula for considering a flow viscosity with a low Reynolds number [52][53][54].…”

Section: Turbulence Modelmentioning

confidence: 99%

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Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Li,

Wang,

Jiang

et al. 2024

Fire

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The use of existing natural gas pipelines for the transport of hydrogen/natural gas mixtures can achieve large-scale, long-distance and low-cost hydrogen transportation. A jet fire induced by the leakage of high-pressure pure hydrogen and hydrogen-blended natural gas pipelines may pose a severe threat to life and property. Based on the Abel–Nobel equation of state and a notional nozzle model, an equivalent pipe leakage model is established to simulate high-pressure pipeline gas leakage jet fire accidents. Large-scale high-pressure hydrogen and natural gas/hydrogen mixture jet fires are simulated, showing the jet impingement process and obtaining an accurate and effective simulation framework. This framework is validated by comparing the simulated and experimental measured results of flame height, flame appearance and thermal radiation. Several combustion models are compared, and the simulated data show that the non-premixed chemical equilibrium combustion model is superior to other combustion models. The influence of the pipe pressure and the hydrogen blending ratio on the consequences of natural gas/hydrogen mixture pipeline leakage jet fire accidents is explored. It is found that when the hydrogen blending ratio is lower than 22%, the increase in the hydrogen blending ratio has little effect on the decrease in the thermal radiation hazard distance.

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Section: Turbulence Modelmentioning

confidence: 99%

“…The P-1 model has low CPU requirements [62]. It belongs to the simplest type of P-N model, which can handle the radiation problem of complex geometries and consumes less resources [50]. The radiation flux q r in the P-1 radiation model can be expressed as follows:…”

Section: Radiation Modelmentioning

confidence: 99%

Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Li,

Wang,

Jiang

et al. 2024

Fire

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“…Therefore, the combustion method has a significant effect on the flame structure. Because partially premixed combustion is a compromise between fully premixed combustion and non-premixed combustion, it has been investigated in facilities such as furnaces and engines. − However, research on the flame structure of partially premixed NH 3 /CH 4 combustion is limited and needs further study.…”

Section: Introductionmentioning

confidence: 99%

Blow-Off Limits, Flame Structure, and Emission Characteristics of Lean Partially Premixed Swirl-Stabilized Flames with NH₃/CH₄

Lai,

Chen,

Zhang

et al. 2024

Energy Fuels

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Recently, ammonia/methane mixtures have been considered as potential alternative fuels. The present study experimentally investigates the blow-off limits, flame structure, and pollutant emission of ammonia/methane mixtures in a partially premixed swirl-stabilized burner. The effects of fuel composition and the equivalence ratio are also studied. The results show that the NH 3 /CH 4 flame can be stabilized at an equivalence ratio of 0.55. The addition of methane has a positive effect on the blow-off limits. For the chemiluminescence profile, the OH* distribution and CH* distribution of NH 3 /CH 4 flames show a similar tendency under various conditions. The peak OH* and CH* radiances monotonically decrease with increasing E NHd 3 , while the maximum NH 2 * shows an opposite trend. The influence of the equivalence ratio on OH* and CH* in the NH 3 /CH 4 flames is negligible. However, when E NHd 3 is 60%, the equivalence ratio has a significant effect on NH 2 *. In terms of pollutant emissions, the peaks of NO and NO 2 emissions are all found around an E NHd 3 of 20%. When the equivalence ratio reaches 1.0, NO and NO 2 emissions are as low as 15 and 10 mg/m 3 , respectively. At the same time, both CO and unburned NH 3 emissions increase. Therefore, further studies on the application of secondary air or improvement of the fuel injection method to improve the combustion efficiency and reduce the pollutant emissions for ammonia combustion are still needed.

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The effect of thermal radiation using different models on methane–air flames combustion modelling using CFD

Rajak,

Panchal,

Verma

et al. 2024

Environ Dev Sustain

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Evaluation of flamelet-based partially premixed combustion models for simulating the gas phase combustion of a grate firing biomass furnace

Cited by 5 publications

References 51 publications

Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Blow-Off Limits, Flame Structure, and Emission Characteristics of Lean Partially Premixed Swirl-Stabilized Flames with NH₃/CH₄

The effect of thermal radiation using different models on methane–air flames combustion modelling using CFD

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Evaluation of flamelet-based partially premixed combustion models for simulating the gas phase combustion of a grate firing biomass furnace

Cited by 5 publications

References 51 publications

Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Numerical Simulation and Consequence Analysis of Full-Scale Jet Fires for Pipelines Transporting Pure Hydrogen or Hydrogen Blended with Natural Gas

Blow-Off Limits, Flame Structure, and Emission Characteristics of Lean Partially Premixed Swirl-Stabilized Flames with NH3/CH4

The effect of thermal radiation using different models on methane–air flames combustion modelling using CFD

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Product

Resources

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Blow-Off Limits, Flame Structure, and Emission Characteristics of Lean Partially Premixed Swirl-Stabilized Flames with NH₃/CH₄