Thermal effect of hollow spheres in a filtration combustion process

Fierro, Matías; Gutierrez, Cristóbal; Bubnovich, V.; Ripoll, Nicolás

doi:10.1016/j.applthermaleng.2021.117037

Cited by 13 publications

(4 citation statements)

References 31 publications

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“…Ce 3+ + H3Cit → Cit-Ce + 3H + (3) Cit-Ce + H3PO4 → CePO4 + H3Cit (4) There was an impact of reaction temperature on hollow spheres morphology [4,5,14,16,20]. The morphology of the experimental samples with increasing reaction temperature, respectively, at 60, 70 and 80 o C (35-minute reaction and other conditions remained unchange) were characterized by FE-SEM.…”

Section: Self-assembly Crystallizationmentioning

confidence: 99%

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

Trinh,

Le,

Truong

et al. 2024

Chem. Pap.

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This study employed a wet chemistry route to synthesize submicron and luminescent CePO4:Tb 3+ hollow spheres with citric acid functioning as a structure-directing agent. Citric acid amount, reaction time and temperature, and annealing temperature were found to adjust particles' size and shape. At 20 mg of citric acid, 35 mins of reaction time at 80 o C, and 500 o C annealing temperature, the CePO4:Tb 3+ particles appeared to have a well-defined hollow sphere shape and inner structure with the highest luminescent intensity. The characteristics were revealed by scanning electron microscopy images and photoluminescence spectroscopy (PL). At optimal synthesis conditions, the X-ray diffractometer recorded the crystalline phase conversion from hexagonal to monoclinic, and PL spectra revealed a green emission at 543 nm attributable to [Tb 3+ ] 5 D4 -7 F5 transition.

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Section: Self-assembly Crystallizationmentioning

confidence: 99%

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

Trinh,

Le,

Truong

et al. 2024

Chem. Pap.

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“…Keramiotis et al 24 studied the relationship between excess air coefficient and combustion characteristics and pollutant emissions and found that when the excess air coefficient was relatively small but the combustion temperature was high, the NOx content of pollutant emissions increased as the combustion intensity increased but as the excess air coefficient continued to increase, the pollutant emission content remained essentially unchanged. However, Fierro et al 25 experimentally investigated the effect of equivalence ratios on pollutant emissions from a porous media combustor during methane-air combustion and found that pollutant emissions were low when equivalence ratios were low but gradually increased as equivalence ratios increased. Janvekar et al 26 studied the combustion and preheating zones of a small burner with a diameter of 23 mm and a length of 100 mm.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Combustion Characteristics of an 800–1200 kW High-Power Porous Media Combustor at Atmospheric Pressure

Lin,

Li,

et al. 2024

ACS Omega

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Porous media combustion has the advantages of high combustion efficiency and low pollutant emissions. However, there are few studies on the combustion characteristics and pollutant emissions of highpower porous media combustion chambers and fire tubes. Based on the computational fluid dynamics method, the stable combustion characteristics and pollutant emission rules of methane-air were explored in a high-power porous media combustion chamber of 800−1200 kW. The results show that the combustion of the porous media combustor is stabilized at an inlet velocity of 0.8−1.6 m/s with an equivalence ratio of Φ = 0.5−0.9. The high-power porous medium combustor has the highest limiting temperature at Φ = 0.7. Temperature increases gradually with increasing porosity within the −2.5 to 1 m axial center interval. The outlet radial temperature distribution tends to be uniform with the increase of porosity, and the outlet temperature is highest for porous media with a thickness of 400 mm. NO emission was lowest at an inlet velocity of 1.2 m/s. A significant reduction in NO emissions was observed with increasing equivalence ratio. NO generation increases with increasing porosity at porosities between 0.75 and 0.85. NO generation increases with the thickness of the porous media and increases sharply at 600 mm. The results above can provide guidelines for the design of a high-efficiency high-power porous combustor.

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“…The fundamentals of porous medium combustion, its applications, and research progress are presented in [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Particularly, the influence of the type and properties of a solid inert material (hollow spheres) on the heat effect during filtration combustion is presented in [27]. The study explores how the incorporation of hollow spheres affects heat transfer, combus-tion efficiency, and emissions in the combustion system.…”

Section: Introductionmentioning

confidence: 99%

European Green Deal: An Experimental Study of the Biomass Filtration Combustion in a Downdraft Gasifier

Golub,

Tsyvenkova,

Kukharets

et al. 2023

Energies

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This study presents the experimental results obtained from hybrid filtration combustion using biomass pellets. The experiments were carried out using a porous media gasifier filled with pellets and inert material. The gasifying agent used was an air–steam mixture, with 40% being steam. The dependence of the temperature in the gasifier’s reaction zone from the volume percentage of inert porous material in the gasifier, the specific heat capacity of this material, as well as the air–steam blowing rate, was investigated. The multifactor experiment method was used. A maximum temperature of 1245 °C was achieved using 28 vol% of porous material with a heat capacity of 1000 J/(kg·°C) and at a blowing rate of 42 m3/h. The maximum hydrogen content in the syngas was 28 vol%. This was achieved at an air–steam blowing rate of 42 m3/h and 40 vol% porous material, with a heat capacity of 1000 J/(kg·°C). The calorific value of the syngas was 12.6 MJ/m3. The highest CO content in the gas was 28 vol% and was obtained at 20 vol% porous material with a heat capacity of 1000 J/(kg·°C) and a blowing rate of 42 m3/h. The obtained information is applicable in the design, management, and control of gas production by way of a hybrid filtration combustion process in a downdraft gasifier.

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Thermal effect of hollow spheres in a filtration combustion process

Cited by 13 publications

References 31 publications

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

Morphology and optical properties of wet chemistry synthesized submicron CePO4:Tb3+ hollow spheres

Numerical Study of the Combustion Characteristics of an 800–1200 kW High-Power Porous Media Combustor at Atmospheric Pressure

European Green Deal: An Experimental Study of the Biomass Filtration Combustion in a Downdraft Gasifier

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