Experimental and numerical investigations of biogas vortex combustion

Khaleghi, Mostafa; Hosseini, Seyed Ehsan; Wahid, Mazlan Abdul

doi:10.1177/0957650915584717

Cited by 10 publications

(5 citation statements)

References 50 publications

(71 reference statements)

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“…The reaction zone encircles the recirculation zone circumferentially, while the heat transfer from such mixing occurs in the flow's core area. Both large-scale and meso-scale AVC have recorded this scale-independent phenomenon 46,48,49) . A recirculation zone forms downstream of the vortex with center recirculation zone (CRZ) in a swirl stabilized non premixed combustion is known to play a significant impact in flame stability as shown below in Figure 4.…”

Section: Asymmetric Swirling Combustormentioning

confidence: 96%

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Najib Aminu Ismail,

Mazlan Abdul Wahid,

Sa’at

et al. 2023

Evergreen

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As the population of the world is growing rapidly, the demand for energy that is clean and efficient is increasing. Combustion is one of the major ways of energy conversion that produces very high amount of pollutant emission, as such the research arena has been taken over by coming up with combustion processes that are cleaner and efficient by the combustion engineers. Flameless combustion is one of the new techniques discovered by researchers to suppress NOx emission due to the low temperature inside the combustion zone that is well below the dissociation temperature of Nitrogen. Homogenous or proper mixing is another major factor that enhances combustion efficiency. An asymmetric swirling combustor is a unique shaped combustor that was developed by researchers in order to enhance better mixing inside the combustion zone without the need for an external swirler. The review investigated several parameters such as temperature uniformity, fuel flexibility and level of pollutant emission as discussed by researchers and it was found that the asymmetric swirling combustor is very efficient with temperature uniformity of about 0.9, thermal efficiency of 53% and very low NOx and CO of about 2ppm and 24ppm according to researchers. It was recommended that the combustor should be investigated under different flow configurations i.e. forward and reverse flow in order to know the optimum direction of flow for the asymmetric swirling combustor.

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Section: Asymmetric Swirling Combustormentioning

confidence: 96%

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Najib Aminu Ismail,

Mazlan Abdul Wahid,

Sa’at

et al. 2023

Evergreen

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show abstract

“…In order to solve the problems of poor combustion stability, easy flameout, and pollutant emission to a certain extent, some scholars have considered using different components of biomass syngas or mixing other gases with biomass syngas to study the impact on the combustion process. Khaleghi et al [12] investigated the temperature, flame stability, and emissions of biogas vortex combustion under the condition of CO2 mole fraction volume percentage ranging from 0 to 40%. As the CO2 content of the biogas increased, the NOx generation rate monotonically decreased.…”

Section: Introductionmentioning

confidence: 99%

Effects of Hydrogen Addition on the Thermal Performance and Emissions of Biomass Syngas Combustion in a Horizontal Boiler

Suxing,

Yu,

et al. 2024

Energies

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Due to its low calorific value, abnormal phenomena such as incomplete combustion and flameout may occur during the combustion process of biomass syngas. The applicability of adding hydrogen can assist in the combustion of biomass syngas in boilers to overcome the above defects, and the effects need to be investigated. In this study, a multi-mechanism model is employed to numerically simulate the flow and combustion of a horizontal boiler burning biomass syngas. The reliability verification of the model is conducted by comparing it with the experimental results of combustion in a domestic boiler with biomass syngas. From the views of multi-fields and synergy, the effects of hydrogen addition on the thermal performance and emissions of biomass syngas are further expounded. Two scenarios are taken into consideration: hydrogen addition at a constant fuel volume flow rate and constant heat input. The result indicates that hydrogen addition significantly affects the multi-field synergy, which is advantageous for improving the heat transfer performance and combustion efficiency of biomass syngas. However, when the hydrogen addition ratio exceeds 20% at a constant fuel volume flow rate and 25% at constant heat input, its impact may be reduced. When the hydrogen content increases, the outlet temperature of the combustion chamber decreases, and pollutant emissions are effectively controlled. The turbulent kinetic energy at the reversal section decreases, and the uniformity of the flow field improves. These results provide certain guidance for the efficient utilization of biomass syngas and the operation of boilers burning biomass syngas.

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“…Many industries and agricultures processes produce the gas byproduct with a relatively low content of combustible gas, such as the landfill gas, chemical exhaust gas, marsh gas, and mining exhaust gas. 1,2 These low calorific gases (LCG) are in a large output, but are difficult to be utilized due to their poor combustion characteristic. To overcome difficulties in LCG ignition and burnout, some combustion technologies were proposed, such as the preheated combustion, porous medium combustion, and catalytic combustion.…”

Section: Introductionmentioning

confidence: 99%

Investigation on NO reduction behavior within complex atmosphere during pilot ignition of low calorific gas

Xing

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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Low calorific gas (LCG) is largely produced in industries and agricultures, but its utilization is difficult due to the poor combustibility and high NO x emission. The pilot ignition combustion has the potential to improve LCG’s combustibility and also reduce NO production with combining air stage approach. However, the complex atmosphere created under pilot ignition condition could complicate the NO reduction (by CH4) behavior and should be clarified. This paper is aimed at gain a deep insight on this issue by exploring the interaction between temperature and atmosphere, the individual role of α and CH4 concentration (or its ratio to NO), and the influence of CO and CO2 presence. The results show that with dropping α, the maximum NO reduction ratio increases, but a higher temperature is needed to achieve this value. Under fuel rich condition, NO reduction was accompanied with HCN formation, which must be considered to analyze the effective reduction. The CO2 generated from pilot flame or originally contained in LCG could inhibit the NO reduction, with this effect being more pronounced at a fuel rich atmosphere. For a CO/CH4 duel reactive LCGs, CO reduces the NO reduction ratio at lower temperature, but improves at higher temperature.

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Experimental and numerical investigations of biogas vortex combustion

Cited by 10 publications

References 50 publications

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Effects of Hydrogen Addition on the Thermal Performance and Emissions of Biomass Syngas Combustion in a Horizontal Boiler

Investigation on NO reduction behavior within complex atmosphere during pilot ignition of low calorific gas

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