Comparison of Efficiencies of Microwave and Conventional Electric Ovens in the Drying of Slime-Coal Agglomerates

Hacıfazlıoğlu, Hasan

doi:10.1080/19392699.2016.1143368

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…Part of the attraction of MW furnaces consists of decreasing the required processing time and therefore saving energy because of the time reduction for application of energy, as it was demonstrated for processes as drying by Hacifazlioglu . It is reported that both, time and energy, have a relation; initially, the amount of energy for starting the thermal processes is higher in the case of MW processing, but once that the reaction is activated, the transformations that take place lead themselves to a steep increase in the temperature that reduces drastically the processing time.…”

Section: Resultsmentioning

confidence: 99%

Feasible glass‐melting process assisted by microwaves

Reinosa

García-Baños

Catalá-Civera

et al. 2019

Int J of Appl Glass Sci

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The advantages of microwave (MW) energy processing have been verified in the sintering of a ceramic frit at a pre-industrial scale. The challenge of achieving high temperature using MW energy at such dimensions was overcome and a mix of natural raw materials was heated until its fluxing point. Changes in dielectric properties of the raw materials mix were also measured in situ with the increase in temperature, being in accordance to thermal processes of a conventional heating process. The properties of the resulting ceramic frit were compared with the same frit obtained by the conventional sintering method. Both frits showed similar thermal behavior regarding DTA-TGA, heating microscopy and XRD (only glassy phase was present). A Raman study confirms the existence of the mentioned glass phase. The application of the frits as glazes were performed and their properties were studied. As a result, glazes with similar properties were obtained which confirms that the MW energy processed frit is suitable for its application as a ceramic glaze. K E Y W O R D Sceramic frit, ceramic glaze, CO 2 emissions, MW dielectric properties, MW energy, time saving

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Section: Resultsmentioning

confidence: 99%

Feasible glass‐melting process assisted by microwaves

Reinosa

García-Baños

Catalá-Civera

et al. 2019

Int J of Appl Glass Sci

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show abstract

“…Apart from the catalytic reactions, MW heating technology has been used in separation fields, involving drying, − extraction, − and demulsification. − In terms of product dryness, MW irradiation can selectively heat the water molecules in the matter and hence accelerate their escape. This heating mode can significantly reduce the reaction time and therefore overcome the problems ( e.g ., oxidation or loss of some volatile components) caused by long-term roasting occurring in traditional routes. , The selective heating behavior of water molecules has exhibited significant advantages in organic extraction, because the induced evaporation of water inside the cells can cause the rupture of biological tissue and cells and the accelerated discharge of bioactive compounds. , The rapid heating of the water phase by MWs can also be used to disturb the water–oil interface, which is conducive to the demulsification of a water-in-oil emulsion.…”

Section: Fundamentals Of Mail Techniquesmentioning

confidence: 99%

Microwave Encounters Ionic Liquid: Synergistic Mechanism, Synthesis and Emerging Applications

Zhao,

Li,

Gao

2023

Chem. Rev.

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Progress in microwave (MW) energy application technology has stimulated remarkable advances in manufacturing and high-quality applications of ionic liquids (ILs) that are generally used as novel media in chemical engineering. This Review focuses on an emerging technology via the combination of MW energy and the usage of ILs, termed microwave-assisted ionic liquid (MAIL) technology. In comparison to conventional routes that rely on heat transfer through media, the contactless and unique MW heating exploits the electromagnetic wave−ions interactions to deliver energy to IL molecules, accelerating the process of material synthesis, catalytic reactions, and so on. In addition to the inherent advantages of ILs, including outstanding solubility, and well-tuned thermophysical properties, MAIL technology has exhibited great potential in process intensification to meet the requirement of efficient, economic chemical production. Here we start with an introduction to principles of MW heating, highlighting fundamental mechanisms of MW induced process intensification based on ILs. Next, the synergies of MW energy and ILs employed in materials synthesis, as well as their merits, are documented. The emerging applications of MAIL technologies are summarized in the next sections, involving tumor therapy, organic catalysis, separations, and bioconversions. Finally, the current challenges and future opportunities of this emerging technology are discussed.

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“…Energy consumption significantly influences the efficiency of the microwave drying process. Hacifazlioglu et al [59] found that the microwave drying of coal slime pellets at 700 W is faster than hot air drying at 150 • C. Meanwhile, Song et al [23] observed a decrease in energy consumption of coal slime particles with a diameter of 50 mm as microwave power increased within the range of 320 to 800 W. In addition, they found that at 800 W, energy consumption increased with an increase in particle size within the range of 30 to 60 mm. Guo et al [60] discovered that the energy consumption of microwave drying sludge decreased with an increase in microwave power and increased with an increase in mass within the range of 500 to 750 g. However, it decreased with an increase in mass within the range of 750 to 1250 g. High dehydration energy consumption poses a challenge to the widespread application of microwave drying technology.…”

Section: Introductionmentioning

confidence: 99%

Microwave Drying of Sewage Sludge: Process Performance and Energy Consumption

Wang,

Zhang,

Huang

et al. 2024

Processes

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The microwave drying of sewage sludge is characterized by its speed and safety. A novel method for identifying free and bound water is proposed in this study. Experiments were performed to investigate the process performance and energy consumption in a microwave drying unit. The results indicate that the microwave drying process can be described in three stages, i.e., the preheating stage, constant-rate stage, and decreasing-rate stage. The preheating and constant-rate stages mainly remove free water, while the decreasing-rate stage mainly removes bound water. The Linear model effectively describes the kinetic processes in the constant-rate stage, and the modified Page I model is suitable for describing the decreasing-rate stage. The energy conversion process in microwave drying is explored, revealing that heat efficiency and energy consumption are consistent with microwave power changes. The heat efficiency in the constant-rate drying stage ranges from 60.33% to 71.01%, lower than that in the preheating stage but higher than that in the decreasing-rate stage. Energy consumption in the constant-rate stage ranges from 3.84 kJ/g to 8.20 kJ/g, significantly lower than in the other two stages. These results provide fundamental data for the industrial application of microwave drying of sludge and contribute to the advancement of microwave drying technology.

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Comparison of Efficiencies of Microwave and Conventional Electric Ovens in the Drying of Slime-Coal Agglomerates

Cited by 14 publications

References 7 publications

Feasible glass‐melting process assisted by microwaves

Feasible glass‐melting process assisted by microwaves

Microwave Encounters Ionic Liquid: Synergistic Mechanism, Synthesis and Emerging Applications

Microwave Drying of Sewage Sludge: Process Performance and Energy Consumption

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