Inhomogeneous packed bed burner for improving the utilization of low‐concentration methane

Qian, Zhendong; Dai, Huaming; Dai, Hao; Wang, Zhiqiang

doi:10.1002/ep.13921

Cited by 4 publications

(2 citation statements)

References 35 publications

(63 reference statements)

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“…Packed beds are widely used across chemical and energy fields, attributed to their superior particle conductivity and enhanced surface area-to-volume ratio, such as hightemperature gas-cooled reactors [1], low calorific value burners [2,3], thermal energy storage systems [4][5][6][7], and catalytic reformers [8,9]. However, accurately capturing the localized thermal behavior in a packed bed remains an arduous task for experimental approaches, due to the complexity of these systems [10].…”

Section: Introductionmentioning

confidence: 99%

DEM-CFD Simulation Analysis of Heat Transfer Characteristics for Hydrogen Flow in Randomly Packed Beds

Zhang,

Xia,

Cheng

et al. 2024

Energies

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In this study, three randomly packed beds with varying tube-to-particle diameter ratios (D/d) are constructed using the discrete element method (DEM) and simulated via CFD under low pore Reynolds numbers (Rep < 100). An innovation of this research lies in the application of hydrogen in randomly packed beds, coupled with the consideration of its temperature-dependent thermal properties. The axial analysis of the heat transfer characteristics shows that PB−5 and PB−6 achieve thermal equilibrium 44% and 58% faster than PB−4, respectively, demonstrating enhanced heat transfer efficiency. However, at higher flow rates (0.8 m/s), the large-sized fluid channels in PB−6 severely impact the heat transfer efficiency, slightly reducing it compared to PB−5. Additionally, this study introduces a localized segmentation method for calculating the axial local Nusselt number, showing that the axial local Nusselt number (Nu) not only exhibits an inverse relationship with the axial porosity distribution, but also matches its amplitude fluctuations. The wall effect significantly impacts the flow and temperature distribution in the packed bed, causing notable velocity and temperature oscillations in the near-wall region. In the near-wall region, the average temperature is lower than in the core region, and the axial temperature profile exhibits more intense oscillations. These findings may provide insights into the use of hydrogen in randomly packed beds, which are vital for enhancing industrial applications such as hydrogen storage and utilization.

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Section: Introductionmentioning

confidence: 99%

DEM-CFD Simulation Analysis of Heat Transfer Characteristics for Hydrogen Flow in Randomly Packed Beds

Zhang,

Xia,

Cheng

et al. 2024

Energies

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“…Environmental problems of solid and liquid fossil fuels increase the use of Natural Gas (NG) as the cleanest fossil fuel in thermal energy applications such as industrial burners and diesel engines. [1][2][3][4][5] However, non-luminous NG flame has poor radiative characteristics and since the radiation is among the major heat transfer methods of flame, this decreases the heat transfer performance of NG flame, that is a limitative item for NG burners. 6,7 Therefore, different methods have been proposed in the investigations to enhance the low radiation behavior of NG burners.…”

Section: Introductionmentioning

confidence: 99%

Cofiring of renewable biodiesel fuels inside natural gas flame for enhancement of thermal properties of flame and NOx reduction

Pourhoseini,

Shams

2024

Env Prog and Sustain Energy

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This study investigates the co‐combustion of palm oil biodiesel fuel, as a renewable alternative for diesel fuel, inside natural gas flame to enhance the flame thermal specifications and NOx reduction. A power natural gas burner with a maximum heat capacity of 418,400 kJ/h was installed at the inlet of a laboratory furnace and biodiesel fuel was injected inside natural gas burner with a 100 μm in diameter solid cone nozzle. Flame temperature, thermal radiation, Infrared radiation, and CO, CO2 and NOx emission were measured. The results revealed that biodiesel injection increases the flame size and turns the non‐luminous blue flame into yellow‐colored flame. Furthermore, higher flash point and Sauter Mean Diameter of biodiesel promote the thermal decomposition of fuel droplets and increase the concentrations of Intermediate Soot Particles in the flame which in turn increases the flame emissivity coefficient and consequently flame thermal radiation. Also, the oxygen content of biodiesel fuel has an important role in the complete combustion of Intermediate Soot Particles to CO2 which increases the heat release of biodiesel combustion and raises the flame temperature. The average enhancement in thermal radiation and flame temperature were 5.6% and 43.38%, respectively. Finally, although biodiesel injection increases the flame temperature, it also increases the flame surface reaction and eliminates the hot spot region in the flame. Therefore, the rate of heat generation per unit volume of flame decreases and this decreases the rate of NOx emission as much as 10.84%.

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Optimized combustor performance based on the combination of bluff body and porous media

Dai,

Zhang,

Dai

et al. 2023

Heat Mass Transfer

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Inhomogeneous packed bed burner for improving the utilization of low‐concentration methane

Cited by 4 publications

References 35 publications

DEM-CFD Simulation Analysis of Heat Transfer Characteristics for Hydrogen Flow in Randomly Packed Beds

DEM-CFD Simulation Analysis of Heat Transfer Characteristics for Hydrogen Flow in Randomly Packed Beds

Cofiring of renewable biodiesel fuels inside natural gas flame for enhancement of thermal properties of flame and NOx reduction

Optimized combustor performance based on the combination of bluff body and porous media

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