Emission Characteristics of Heat Recirculating Porous Burners With High Temperature Energy Extraction

Banerjee, Abhisek; Saveliev, Alexei V.

doi:10.3389/fchem.2020.00067

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…The advancement of humankind is conditional on the steady supply of food and energy. The domain of energy has been explored by numerous researchers worldwide [4][5][6][7][8]. To meet the growing protein demand and to supply fish for human consumption, aquaculture has shifted toward intensive practices with a recirculating aquaculture system (RAS).…”

Section: Introductionmentioning

confidence: 99%

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Paul

Hall

2021

Water

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Denitrification processes are crucial in aquaculture as they convert the undesirable nitrate to safer forms of nitrogen. Conventionally, plastic media are used for the biofiltration of wastewater. However, alternative media may be as effective/better than plastic and enhance the sustainability of the system. This study evaluated biochar and zeolite as alternatives for the denitrification of aquaculture effluents. Triplicates of laboratory-scale bioreactors were fabricated to compare the denitrification efficiencies of biochar and zeolite to that of plastic. The bioreactors were fed synthetic aquaculture wastewater having nitrate loading rates of 50, 125, and 150 mg/L. Zeolite exhibited highest values of surface roughness in terms of arithmetic mean height (0.89 µm), maximum height (6.52 µm), and root-mean-square height (1.17 µm), as corroborated by surface profilometry and scanning electron microscopy. The results revealed that under pseudo-steady-state conditions, zeolite displayed the highest nitrate removal efficiency (maximum 95.02 ± 0.01%), which was followed by biochar and plastic (maximum 92.91 ± 0.01% and 92.57 ± 0.02%, respectively) due to its extraordinary surface roughness that provided better adhesion to the bacteria. However, by the end of the study, all the media exhibited comparable rates. Thus, both zeolite and biochar are sustainable alternatives of biomedia for nitrate removal. However, time and labor constraints must be accounted for to scale-up such bioreactors.

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Section: Introductionmentioning

confidence: 99%

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Paul

Hall

2021

Water

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“…Last decade has witnessed a great development in the domain of porous medium. On one side as there are researchers investigating the solid-fluid inter-phasial interaction for various regimes of flow though porous medium [17,18], there are many researchers [19][20][21][22][23][24][25][26][27] investigating the scope and implementation of porous medium towards applications involving thermal transport. As mentioned above, there is a plethora of research available that supports the advantages of using porous foam to augment thermal transport.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis using a duct filled with metal foams

Banerjee

Paul

2022

Journal of Thermal Engineering

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Thick-walled pipe experiencing internal flow is widely used in a variety of applications in the industry. Some of the most prominent ones are heat exchangers, heat pipes, furnaces, etc. In this study, conjugate heat transfer has been examined in a pipe filled with a porous medium experiencing a constant external heat flux. Th e an al ysis is ba se d on a tw o- dimensional domain using a quasi-thermal equilibrium model. Effects of porosity, pore density, Reynold’s number and thermal conductivity of solid and fluid on the Nusselt number have been studied. Three types of porous foams based on the pore density have been chosen for the analysis: 10 PPI, 40 PPI and 60 PPI. The results have been generalized for use in a wide range of Newtonian fluids. Additionally, the pressure drops across the pipes fi ll ed wi th po ro us media have been studied as a function of pore density and Reynold’s number. Numerical results indicate augmented performance with porous foams of high pore densities. However, using a porous medium with higher pore density leads to higher pressure drop, thus needing pumping power. The computational model used in this manuscript predicts that Nusselt number is increased by 38.7 % with Reynold’s number < 10000, when the porous medium is changed from 10 PPI to 60 PPI. The numerical data presented in the manuscript supports the application of low porosity foam with low pore density to achieve better thermal transport at the cost of pressure drop.

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“…With the development of the coal mining industry, a large amount of unusable low-concentration gas is discharged into the air every year, causing serious greenhouse effect and waste of resources [1][2][3][4][5]. With the acceleration of the international community to deal with climate change, how to deal with low-concentration gas to reduce greenhouse gases has become an urgent problem [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Combustion of Low‐Concentration Gas in a Porous Media Burner: Reactor Design and Optimization

Chen

Wen

et al. 2021

Shock and Vibration

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In order to utilize the low-concentration gas directly discharged into the atmosphere from 1.1% to 1.50% in coal mine production, the heat storage and oxidation equipment of gas was improved, and the heat storage and safety of gas under high-temperature environment were tested. The experimental results show that the regenerative oxidation system could provide a high-temperature oxidation environment of 1000°C for gas oxidation after changing the heating mode and enhancing the sealing property. The pressure curves of air and gas in the burner were similar. With the increase of gas concentration, the pressure difference between inlet and outlet tended to increase linearly with a minimum pressure differential of 4 kPa (air) and a maximum pressure differential of 11 kPa (1.50% gas). The internal pressure was relatively stable without an instantaneous pressure surge or explosion. The result of this study provides a reference for further research on the low-concentration gas regeneration oxidation unit at high temperatures.

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Emission Characteristics of Heat Recirculating Porous Burners With High Temperature Energy Extraction

Cited by 7 publications

References 30 publications

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Biochar and Zeolite as Alternative Biofilter Media for Denitrification of Aquaculture Effluents

Heat transfer analysis using a duct filled with metal foams

Combustion of Low‐Concentration Gas in a Porous Media Burner: Reactor Design and Optimization

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