Special Issue “Thermochemical Conversion Processes for Solid Fuels and Renewable Energies”

This paper provides a review of different contributions dedicated thus far to entropy generation analysis (EGA) in turbulent combustion systems. We account for various parametric studies that include wall boundedness, flow operating conditions, combustion regimes, fuels/alternative fuels and application geometries. Special attention is paid to experimental and numerical modeling works along with selected applications. First, the difficulties of performing comprehensive experiments that may support the understanding of entropy generation phenomena are outlined. Together with practical applications, the lumped approach to calculate the total entropy generation rate is presented. Apart from direct numerical simulation, numerical modeling approaches are described within the continuum formulation in the framework of non-equilibrium thermodynamics. Considering the entropy transport equations in both Reynolds-averaged Navier–Stokes and large eddy simulation modeling, different modeling degrees of the entropy production terms are presented and discussed. Finally, exemplary investigations and validation cases going from generic or/and canonical configurations to practical configurations, such as internal combustion engines, gas turbines and power plants, are reported. Thereby, the areas for future research in the development of EGA for enabling efficient combustion systems are highlighted. Since EGA is known as a promising tool for optimization of combustion systems, this aspect is highlighted in this work.

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“…They relied on the experimental data taken from the plant. Further contributions in this respect can be found in [ 64 , 65 ].…”

Section: Experimental Investigations and 1d Calculations Of Exergy An...mentioning

confidence: 99%

Entropy Generation Analysis in Turbulent Reacting Flows and Near Wall: A Review

Sadiki

Agrebi

Ries

2022

Entropy

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“…During oxy-fuel combustion, pure oxygen replaces air, thereby eliminating the requirement for flue gas de-NOx and the incorporation of 80-98 • C CO 2 in the exhaust, resulting in a more effective and reliable CO 2 removal method. Although the process requires a lot of energy, corrosion is aided by SO 2 concentration due to the increased energy consumption [12]. Gasification under low O 2 pressure in pre-combustion CCS produces syngas (CO + H 2 ) from the fuel pretreatment [4].…”

Section: Introductionmentioning

confidence: 99%

“…In the presence of high CO 2 concentrations in fuel gas, separation is less difficult than with other methods, resulting in the formation of H 2 as a transport medium for energy. This helps to offset some of the technology's operational costs [12].…”

Section: Introductionmentioning

confidence: 99%

Review of Carbon Capture and Methane Production from Carbon Dioxide

Akpasi

Isa

2022

Atmosphere

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In the last few decades, excessive greenhouse gas emissions into the atmosphere have led to significant climate change. Many approaches to reducing carbon dioxide (CO2) emissions into the atmosphere have been developed, with carbon capture and sequestration (CCS) techniques being identified as promising. Flue gas emissions that produce CO2 are currently being captured, sequestered, and used on a global scale. These techniques offer a viable way to encourage sustainability for the benefit of future generations. Finding ways to utilize flue gas emissions has received less attention from researchers in the past than CO2 capture and storage. Several problems also need to be resolved in the field of carbon capture and sequestration (CCS) technology, including those relating to cost, storage capacity, and reservoir durability. Also covered in this research is the current carbon capture and sequestration technology. This study proposes a sustainable approach combining CCS and methane production with CO2 as a feedstock, making CCS technology more practicable. By generating renewable energy, this approach provides several benefits, including the reduction of CO2 emissions and increased energy security. The conversion of CO2 into methane is a recommended practice because of the many benefits of methane, which make it potentially useful for reducing pollution and promoting sustainability.

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“…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. Thus, besides the economic impact, with the evaluation of the energy efficiency of a system, it is possible to promote a reduction in the environmental impacts caused by the generation and emission of greenhouse gases (GHGs) [2].…”

Section: Introductionmentioning

confidence: 99%

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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Special Issue “Thermochemical Conversion Processes for Solid Fuels and Renewable Energies”

Cited by 6 publications

References 26 publications

Entropy Generation Analysis in Turbulent Reacting Flows and Near Wall: A Review

Entropy Generation Analysis in Turbulent Reacting Flows and Near Wall: A Review

Review of Carbon Capture and Methane Production from Carbon Dioxide

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

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