Numerical study of natural gas and low-calorific syngas co-firing in a pilot scale burner

Kiedrzyńska, Aleksandra; Lewtak, Robert; Świątkowski, B.; Jóźwiak, Piotr; Hercog, Jarosław; Badyda, Krzysztof

doi:10.1016/j.energy.2020.118552

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…The first part is the calculation of the cold flow field in the fluid domain. The second part of the combustion field calculation is carried out by setting the outlet pressure until the pressure at the monitoring point of the furnace equals -65Pa, until the volumetric reaction calculation converges and then the third part of the radiation field calculation is carried out [12] .…”

Section: Calculation Processesmentioning

confidence: 99%

Numerical simulation of combustion distribution in a gas burner

Bao

Lin

2021

E3S Web Conf.

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The combustion effect of natural gas-air mixed combustion is optimised through an effective and rational design of the burner structure, thereby reducing the emission of atmospheric pollutants and achieving energy saving and emission reduction. This paper starts from the geometric model of the burner and uses Computational Fluid Dynamics (CFD) technology to numerically simulate the combustion distribution in the burner, which results in the combustion distribution of the burner after optimising the structure. The guiding effect of the blower guide vanes on the airflow is weak, and the back pressure effect of the guide vanes mounting body is significant, which reduces the primary air volume and prolongs the combustion history in the central region of the flame; The temperature field is evenly distributed and the combustion is well distributed; CH4 and CO in the furnace chamber are basically burned out and the NO concentration in the furnace chamber is about 800 ppm, which basically meets the emission standard and the combustion effect is good. This paper has certain guiding significance for the study of burner structure.

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Section: Calculation Processesmentioning

confidence: 99%

Numerical simulation of combustion distribution in a gas burner

Bao

Lin

2021

E3S Web Conf.

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“…The combustion of the prepared LCV gas mixture was performed in an adiabatic chamber (8) with internal dimensions of 600 × 600 × 2500 mm. The temperatures in the chamber were measured with four K type thermocouples (T 1 -T 4 ).…”

Section: Waste Biogas Burnermentioning

confidence: 99%

“…It could be achieved using new concepts/modifications of burners [4][5][6][7]. For example, a new burner design based on modified geometry was proposed and tested for low calorific gas combustion by [8]. It was found that this burner ensures stable combustion of natural gas and syngas blends, but CO emissions exceed 200 mg/m 3 if thermal shares of syngas are below 70%.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Waste Biogas Flame Stability Under Oxygen or Hydrogen-Enriched Conditions

Striūgas¹,

Paulauskas²,

Skvorčinskienė³

et al. 2020

Energies

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Increasing production rates of the biomethane lead to increased generation of waste biogases. These gases should be utilized on-site to avoid pollutant emissions to the atmosphere. This study presents a flexible swirl burner (~100 kW) with an adiabatic chamber capable of burning unstable composition waste biogases. The main combustion parameters and chemiluminescence emission spectrums were examined by burning waste biogases containing from 5 to 30 vol% of CH4 in CO2 under air, O2-enriched atmosphere, or with the addition of hydrogen. The tested burner ensured stable combustion of waste biogases with CH4 content not less than 20 vol%. The addition of up to 5 vol% of H2 expanded flammability limits, and stable combustion of the mixtures with CH4 content of 15 vol% was achieved. The burner flexibility to work under O2-enriched air conditions showed more promising results, and the flammability limit was expanded up to 5 vol% of CH4 in CO2. However, the combustion under O2-enriched conditions led to increased NOx emissions (up to 1100 ppm). Besides, based on chemiluminescence emission spectrums, a linear correlation between the spectral intensity ratio of OH* and CH* (IOH*/ICH*) and CH4 content in CO2 was presented, which predicts blow-off limits burning waste biogases under different H2 or O2 enrichments.

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“…Among the results described above, it was discovered that an increase in N radicals leads to more significant NO x production. Kiedrzynska et al [15] used CFD to analyze the co-combustion of natural gas and syngas in an unmodified burner. It was found that it is possible to add only a small amount of syngas (up to 10% of thermal share) before reaching the burner limit.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inert Fuel Compounds on Flame Characteristics

et al. 2021

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To describe the effects of inert compounds in gaseous fuel, experiments on three different process burners (staged fuel burner, staged air burner, and low-calorific burner) were carried out. The tested burners are commercially available, but they were specially designed for experimental usage. Tests were carried out in the semi-industrial burner testing facility to investigate the influence of inert gases on the flame characteristics, emissions, and heat flux to the combustion chamber wall. Natural gas was used as a reference fuel, and, during all tests, thermal power of 500 kW was maintained. To simulate the combustion of alternative fuels with lower LHV, N2 and CO2 were used as diluents. The inert gas in the hydrocarbon fuel at certain conditions can lower NOx emissions (up to 80%) and increase heat flux (up to 5%). Once incombustible compounds are present in the fuel, the higher amount of fuel flowing through nozzles affects the flow in the combustion chamber by increasing the Reynolds number. This can change the flame pattern and temperature field, and it can be both positive and negative, depending on actual conditions.

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Numerical study of natural gas and low-calorific syngas co-firing in a pilot scale burner

Cited by 12 publications

References 19 publications

Numerical simulation of combustion distribution in a gas burner

Numerical simulation of combustion distribution in a gas burner

Investigation of Waste Biogas Flame Stability Under Oxygen or Hydrogen-Enriched Conditions

The Effect of Inert Fuel Compounds on Flame Characteristics

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