Experimental evaluation of thermal radiation and soot concentration rates for syngas flames in lean condition and oxygen enhanced combustion

Silva, Lucas C.P.; Wilfinger, Mariana; Murari, Thiago B.; Filho, Aloísio S. Nascimento; Moret, Marcelo A.; Santos, Alex Álisson Bandeira

doi:10.1016/j.egyr.2021.06.096

Cited by 5 publications

(7 citation statements)

References 30 publications

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“…Another strategy documented in the patents and also found in the literature is the use of O 2 to enhance the combustion process. First mentioned by Baukal (1998) [38], OEC is a process that involves enriching the intake air for combustion with O 2 ; it provides good results, including higher productivity, better thermal efficiency, a lower volume of exhaust gas, greater efficiency in heat transfer processes, reduction in fuel consumption, cost reduction in raw material, and greater flame characteristics, which promote stability and shape control [1,39,40]. Patent EP2284130A1 (2011) refers to a new method of producing mineral wool using a cupola furnace, where the combustion chamber is fed with fuel and O 2 gas.…”

Section: Resultsmentioning

confidence: 99%

“…Despite being a technology with a great environmental impact, combustion still is one of the most commonly used energyrelease mechanisms because of the energy densification inherent to fuels. As a way to reduce its impact, it is extremely important to study techniques and possible fuels that can contribute to reducing toxic emissions to the environment [1]. Within this context, the study of the energy efficiency of combustion processes, such as the use of burners for energy generation, is necessary, since a large part of the costs of an industry is associated with the purchase of these systems, as well as the operation and maintenance services for the entire system.…”

Section: Introductionmentioning

confidence: 99%

“…2022, 12, 5858 2 of 18 Industrial burners are among the main equipment that must have their thermal efficiency increased in order to decrease fuel consumption, as well as to reduce the emission of pollutants and GHGs [3]. Among the techniques used for this purpose, oxygen-enhanced combustion (OEC), characterized by oxygen (O 2 ) rates higher than those found in atmospheric air [1], can add up to 30% of O 2 without major changes in the equipment to which it is applied. In general, its application in combustion systems can provide several benefits, such as increased productivity, thermal efficiency, lower exhaust gas volume, greater efficiency of heat-transfer processes, and reduced fuel consumption [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Patent Analysis of the Development of Technologies Applied to the Combustion Process

et al. 2022

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The use of combustion in industrial activity is of paramount importance for economic and social development. However, combustion reactions are the main sources of atmospheric pollutant emissions. Given this reality, it is necessary to study new combustion techniques, such as the application of oxygen in the process, in order to increase the efficiency and productivity of the burning process and energy production. In addition, studies have reported the use of acoustic excitation, a low-investment technique that can promote higher rates of heat and mass transfer. Thus, the goal of this study was to bring data on the current scenario related to the application of these two technologies to the combustion process where, through the reported results, they can be used as a guide for companies’ decisions about new technologies and global trends to be identified. For this, a technological prospection was carried out which focused on patents to investigate the use of oxygen-enhanced combustion and acoustic excitation coupled to the combustion process; a total of 88 documents were found. Few documents applied acoustic excitation for process improvement, indicating that its use is recent; however, according to the literature, it is a promising field to be explored. Siemens AG was the main depositor, and ten primary inventors were identified. Germany and the United States were the countries with the highest number of filings. In the prospected documents, it was possible to identify that there is a need for the further investigation of the joint use of both techniques. These investigations may lead to the development of processes and devices that can provide economic and environmental gains for the energy industry.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patent Analysis of the Development of Technologies Applied to the Combustion Process

et al. 2022

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“…The role of oxygen in the formation of soot has been studied by numerous authors [36,[38][39][40][41][42], and it has been found that introducing oxygen into a flame increases the rate of soot inception, formation, agglomeration, and oxidation. These fundamental effects on the flame-formed soot may have a profound impact on the structure and hydrophobicity of the flame-formed C-layers.…”

Section: C-layers Formed In Cme/oxygen-enriched Air Flamesmentioning

confidence: 99%

Synthesis of Carbonaceous Hydrophobic Layers through a Flame Deposition Process

Merchan-Breuer¹,

Murphy²,

Berka³

et al. 2022

Applied Sciences

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In this study we report the effect of fuel type (biodiesel vs. methane), flame structure and flame height (inner-cone vs. outer-cone), and the percent of oxygen content in the oxidizer stream for the formation of hydrophobic carbon layers using co-flow diffusion flames. It was found that a flame formed using a gaseous fuel (methane) over a vaporized liquid fuel, Canola Methyl Ester (CME), has significant structural differences that enable vastly different deposition behavior of soot layers on the surface of solid substrates. Due to its larger pyrolysis zone (taller inner-cone), the CH4/air flame has a smaller region that supports uniform soot deposition of hydrophobic carbon layers (C-layers) compared to the CME/air flame. When a solid substrate is placed within the pyrolysis zone (inner-cone) of a flame the resulting layer is non-uniform, hydrophilic, and consists of undeveloped soot. However, when outside the pyrolysis zone, the deposited soot tends to be uniform and mature, ultimately creating a hydrophobic C-layer consisting of the typical microscale interconnected weblike structures formed of spherical soot nanoparticles. The effect of oxygen content (35% and 50% O2) in the oxidizer stream for the formation of hydrophobic C-layers was also studied in this work. It was found that oxygen enrichment within the CME flame alters the structure of the flame, hence affecting the morphology of the formed C-layer. Under oxygen enrichment the central region of the deposited C-layer is composed of a weblike structure similar to those seen in the air flames; however, this central region is bordered by a region of densely compacted soot that shows signs of significant thermal stress. At 35% O2 the thermal stress is expressed as multiple microscale cracks while at 50% O2 this border region shows much larger cracks and macroscale layer peeling. The formed C-layers under the different flame conditions were tested for hydrophobicity by measuring the contact angle of a water droplet. The morphology of the C-layers was analyzed using scanning electron microscopy.

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“…The use of computational modeling plays a highly significant role in the development, optimization, and enhancement of renewable energy systems at various generation scales NASCIMENTO FILHO at al, 2018;MURARI at al, 2020;SILVA at al, 2021). The process of capturing energy from solar radiation has evolved significantly through the application of various optimization techniques, which can enhance the efficiency and reliability of solar energy installations, thereby contributing to a more sustainable future (NASCIMENTO FILHO at al, 2017;NASCIMENTO FILHO at al, 2022;DE OLIVEIRA at al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Comparison of multilayer perceptron neural network architecture in photovoltaic plants fault classification

Bezerra,

Ferreira,

Brito

et al. 2023

CLIUM

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The goal of this study is to assess the application of Multilayer Perceptron Artificial Neural Networks in fault classification within photovoltaic panels, focusing on key characteristics such as the number of neurons and layers, activation functions, training techniques, and the resulting accuracy. The study employs a comparative analysis approach, examining various characteristics and hyperparameters applied to Multilayer Perceptron Artificial Neural Networks for fault classification in photovoltaic panels. The research methodology involves reviewing publications from the past decade to gather data on these characteristics and their impact on fault analysis in photovoltaic generation systems. This study contributes to the originality of the field by providing a comprehensive comparison of various parameters and techniques used in Multilayer Perceptron Artificial Neural Networks for fault classification in photovoltaic panels. The findings offer valuable insights for researchers and practitioners in the renewable energy sector, aiding in the development of more efficient and reliable fault diagnosis systems for photovoltaic generation.

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Experimental evaluation of thermal radiation and soot concentration rates for syngas flames in lean condition and oxygen enhanced combustion

Cited by 5 publications

References 30 publications

Patent Analysis of the Development of Technologies Applied to the Combustion Process

Patent Analysis of the Development of Technologies Applied to the Combustion Process

Synthesis of Carbonaceous Hydrophobic Layers through a Flame Deposition Process

Comparison of multilayer perceptron neural network architecture in photovoltaic plants fault classification

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