Analysis of the effect of H2O content on combustion behaviours of a biogas fuel

Şahin, Murat; İlbaş, Mustafa

doi:10.1016/j.ijhydene.2019.02.042

Cited by 16 publications

(5 citation statements)

References 10 publications

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“…This represents an advantage in making it possible to predict a phenomenon behavior and make corrections to designs before they are built. Several investigations have been carried out not only in swirling induced combustion chambers (CCs) [4,29,33,[37][38][39] but also in biogas-powered CCs [3,7,16], as well as on their corresponding behavior regarding pollutant emissions [37,[40][41][42], obtaining similar results to the experimental models. In order to better match experimental results with the numerical model, it is necessary to select the correct turbulence model.…”

Section: Effect Of Swirling Flows In Flamesmentioning

confidence: 98%

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

et al. 2021

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Climate change as a worldwide phenomenon is the cause of multinational agreements such as the Kyoto Protocol and the Paris Agreement with the goal of reducing greenhouse gas emissions. Biogas is one of the most promising biofuels for the integration of clean energy sources; however, biogas has the disadvantage of a low calorific value. To overcome this problem, mechanical devices such as swirlers are implemented in combustion chambers (CCs) to increase their combustion efficiencies. A swirler induces rotation in the airstream that keeps a constant re-ignition of the air–fuel mixture in the combustion. We present the numerical modeling using computational fluid dynamics (CFD) and experimental testing of combustion with biogas in a CC, including an optimized swirler in the airstream with a swirl number (Sn) of 2.48. A turbulence model of the renormalization group (RNG) was used to analyze the turbulence. Chemistry was parameterized using the laminar flamelet model. The numerical model allows visualizing the recirculation zone generated at the primary zone, and partially at the intermediate zone of the CC caused by the strong swirl. Temperature distribution profiles show the highest temperatures located at the intermediate and dilution zones, with the last one being a characteristic feature of biogas combustion. A strong swirl in the airstream generates low-velocity zones at the center of the CC. This effect centers flame, avoiding hot spots near the flame tube and flashback at the structural components. Regarding pollutant emissions, the goal of a biogas that generates less pollutants than nonrenewable gases is accomplished. It is observed that the mole fraction of NO in the CC is close to zero, while the mole fraction of CO2 after combustion is lowered compared to the original mole fraction contained in the biogas (0.25). The mole fraction of CO2 obtained in experimental tests was 0.0127. Results obtained in the numerical model for temperatures and mole fractions of CO2 and NO show a behavior similar to that of the experimental model. Experimental results for mole fraction of CO emissions are also presented and have a mean value of 0.0009. This value lies within allowed pollutant emissions for CO according to national environmental regulations.

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Section: Effect Of Swirling Flows In Flamesmentioning

confidence: 98%

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

et al. 2021

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“…Furthermore, it can react with H 2 S to form sulfuric acid (H 2 SO 4 ) [140]. Noteworthily, Sahin and Ilbas [141] investigated the impact of H 2 O content on the biogas combustion behavior. The above-mentioned authors have demonstrated that an increase in the H 2 O content leads to a reduction in the biogas flame temperature due to the mixture dilution.…”

Section: H 2 Omentioning

confidence: 99%

Biogas Upgrading Using a Single-Membrane System: A Review

Tomczak,

Gryta,

Daniluk

et al. 2024

Membranes

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In recent years, the use of biogas as a natural gas substitute has gained great attention. Typically, in addition to methane (CH4), biogas contains carbon dioxide (CO2), as well as small amounts of impurities, e.g., hydrogen sulfide (H2S), nitrogen (N2), oxygen (O2) and volatile organic compounds (VOCs). One of the latest trends in biogas purification is the application of membrane processes. However, literature reports are ambiguous regarding the specific requirement for biogas pretreatment prior to its upgrading using membranes. Therefore, the main aim of the present study was to comprehensively examine and discuss the most recent achievements in the use of single-membrane separation units for biogas upgrading. Performing a literature review allowed to indicate that, in recent years, considerable progress has been made on the use of polymeric membranes for this purpose. For instance, it has been documented that the application of thin-film composite (TFC) membranes with a swollen polyamide (PA) layer ensures the successful upgrading of raw biogas and eliminates the need for its pretreatment. The importance of the performed literature review is the inference drawn that biogas enrichment performed in a single step allows to obtain upgraded biogas that could be employed for household uses. Nevertheless, this solution may not be sufficient for obtaining high-purity gas at high recovery efficiency. Hence, in order to obtain biogas that could be used for applications designed for natural gas, a membrane cascade may be required. Moreover, it has been documented that a significant number of experimental studies have been focused on the upgrading of synthetic biogas; meanwhile, the data on the raw biogas are very limited. In addition, it has been noted that, although ceramic membranes demonstrate several advantages, experimental studies on their applications in single-membrane systems have been neglected. Summarizing the literature data, it can be concluded that, in order to thoroughly evaluate the presented issue, the long-term experimental studies on the upgrading of raw biogas with the use of polymeric and ceramic membranes in pilot-scale systems are required. The presented literature review has practical implications as it would be beneficial in supporting the development of membrane processes used for biogas upgrading.

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“…With an increase in the H2O content, the position of the flame zone moves to the lower part of the combustion chamber. The better airfuel mixture results in lower CO2 emissions as the H2O content increases [7].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the components on the combustion characteristics of biogas is considered in a number of works. Sahin et al [7] conducted numerical research to study the effect of changing the H2O content in biogas on the biogas combustion characteristics and found that with an increase in the H2O content in biogas, the temperature of the biogas flame in the combustion chamber decreases due to dilution of the mixture.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Biogas Composition on the Characteristics of the Combustion Process

Leonov

Trubaev

2022

DJES

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Biogas can serve as a substitute for natural fuel, but its use is associated with a number of features associated with the difference in its composition from natural gas. Landfill gas generated in the body of MSW landfills is characterized by a significant change in composition. The purpose of the work was a theoretical study of the effect of changing the composition of biogas and the coefficient of excess air on the parameters of the combustion process - gas and air consumption, combustion temperature and on the volume of combustion products. The influence of the ratio of CO2 and N2 contained in biogas on the main combustion characteristics was also evaluated. It is concluded that the combustion of biogas of variable composition, subject to ensuring the specified heat output of the furnace or boiler, does not require a change in air flow, but only a change in the flow of biogas depending on the content of methane in it. Reducing the content of methane leads to an increase in the volume of exhaust gases and a decrease in their temperature. Therefore, a decrease in the methane content in biogas can lead to a decrease in the intensity of heat exchange and a decrease in the efficiency of the unit. The ratio of CO2 and N2 practically does not affect the thermal parameters of combustion. The results of the study are necessary when designing equipment and determining the operating mode of equipment that burns biogas that is formed in natural conditions, for example, landfill gas generated at HSW landfill.

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Analysis of the effect of H2O content on combustion behaviours of a biogas fuel

Cited by 16 publications

References 10 publications

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

Numerical and Experimental Analysis of the Effect of a Swirler with a High Swirl Number in a Biogas Combustor

Biogas Upgrading Using a Single-Membrane System: A Review

The Effect of Biogas Composition on the Characteristics of the Combustion Process

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