APPLICATION OF MICROWAVE INSTALLATIONS FOR SWELLING OF GRANULAR THERMAL INSULATION MATERIALS BASED ON LIQUID GLASS
DOI:
https://doi.org/10.24025/2306-4412.2.2023.272418Keywords:
granular materials, liquid glass, microwave radiation, convective heating, swelling coefficient, efficiency ratioAbstract
The paper studies the process of obtaining swelled granular materials based on liquid glass under the action of microwave radiation and compares it with the process of obtaining these materials with traditional convective heating. It has been established that under the action of microwave radiation at the same temperatures with convective heating, swelling of granular material occurs twice as intensively. Thus, at a power of 650 W (T=115-120 °C), the swelling coefficient reaches its constant value of 2.86 already at the 6th minute of the process, while when grains swell during convective heating at the same temperature, the highest value of the swelling coefficient is 1.534, and it is reached after 11 minutes, which indicates the complexity of grain swelling under these conditions, due to the occurrence of competing processes of porization and dehydration. The acceleration of the swelling process and the possibility of carrying it out at lower temperatures are due to the fact that under the action of microwave radiation due to the excitation of ionic currents by the microwave field, diffusion processes of substances with ionic conductivity, which include liquid glass, are significantly intensified. The impossibility of carrying out the process at given temperatures during convective heating is explained by the fact that the main condition which ensures swelling during heat treatment is the coincidence in time of the pyroplastic state of the material with the most intense gas evolution. The pyroplastic properties of alkali soluble silicates are manifested in the temperature range of 120-250 °C, which corresponds to the maximum water removal, that is, at the temperatures of 115-120 °C, the process is just beginning. To confirm the effectiveness of the use of microwave installations, the energy consumption and efficiency ratio of the installations have been calculated and it is determined that the efficiency ratio of the microwave installation is almost twice the efficiency ratio of the drying installation. The paper also presents the types of industrial microwave installations in which it is possible to carry out the process of swelling of liquid glass grains.
References
А. Seco, J. M. del Castillo, C. Perlot, S. Marcelino, and S. Espuelas, "Recycled granulates manufacturing from spent refractory wastes and magnesium based binder", Construction and Building Materials, vol. 365, 130087, 2023. doi: 10.1016/j.conbuildmat.2022.130087/.
M. Li et al., "Energy-saving production of high value-added foamed glass ceramic from blast furnace slag and hazardous wastes containing heavy metal ions", Journal of Cleaner Production, vol. 383, 135544, 2023. doi: 10.1016/j.jclepro.2022.135544.
M. Shi, T.-C. Ling, B. Gan, and M. Guo, "Turning concrete waste powder into carbonated artificial aggregates", Construction and Building Materials, vol. 199, pp. 178-184, 2019. doi: 10.1016/j.conbuildmat.2018.12.021.
И. И. Юцис, Новое технологическое оборудование для производства теплоизоляционных материалов. Москва, Россия: Стройиздат, 1985.
О. Miryuk, F. Fediuk, and M. Amran, "Foam glass crystalline granular material from a polymineral raw mix", Crystals, vol. 11(12), p. 1447, 2021. doi: 10.3390/cryst11121447.
О. Miryuk, F. Fediuk, and M. Amran, "Porous fly ash/aluminosilicate microspheresbased composites containing lightweight granules using liquid glass as binder", Polymers, vol. 14 (17), p. 3461, 2022. doi: 10.3390/polym14173461.
A. S. Apkarian, L. A. Gomze, J.-E. F. M. Ibrahim, and S. N. Kulkov, "Sintering of silica-alumina granular materials and its catalytic properties", Journal of Silicate Based and Composite Materials, vol. 73, no. 4, pp. 132-136, 2021. doi: 10.14382/epitoanyag-jsbcm.2021.19.
K. Weinberger, "Expanded-glass granular material and method for producing same", WO2016124428A1. C03C11/007, Date pat. 11.08.2016. [Online]. Available: https://patents.google.com/patent/WO2016124428A1/en/.
A. M. Pavlenko, and H. V. Koshlak, "Thermal insulation materials wish porous structure", Journal of New Technologies in Environmental Science, vol. 2, no. 4, pp. 187-196, 2018. doi: 10.30540/sae-2018-025.
Qi Hu et al., "Microwave technology: A novel approach to the transformation of natural metabolites". Chinese Medicine, vol. 16, article no. 87, 2021. doi: 10.1186/s13020-021-00500-8.
D. A. Jones, T. P. Lelyveld, S. D. Mavrofidis, S. W. Kingman, and N. J. Miles, "Microwave heating applications in environmental engineering - a review", Resources, Conservation and Recycling, vol. 34, pp. 75-90, 2002. doi: 10.1016/S0921-3449(01)00088-X.
А. И. Кудяков, Н. А. Свергунова, и М. Ю. Иванов, Зернистый теплоизоляционный материал на основе модифицированной жидкостекольной композиции: монография / под ред. А. И. Кудякова. Томск, Россия: Изд-во Том. гос. архит.-строит. ун-та, 2010.
В. И. Корнеев, и В. В. Данилов, Растворимое и жидкое стекло. Санкт-Петербург, Россия: Стройиздат, 1996.
R. Iler, The Colloid Chemistry of Silica and Silicates. Itaka, N.Y., 1955.
C. Demitri et al., "Preparation and characterization of cellulose-based foams via microwave curing". Interface Focus, vol. 4, p. 20130053, 2014.
К. В. Луняка, Б. В. Димо, Н. Б. Андрєєва, та І. В. Калініченко, Розрахунки з дисципліни "Теплотехнологічні процеси та установки": навч. посіб. Херсон, Україна: ХНТУ, 2018.
Н. А. Пинчукова, "Основы технологии получения кокарбоксилазы гидрохлорида с использованием микроволнового излучения": дис. канд. техн. наук: 05.17.04. Харьков, Украина, 2014.
В. Г. Гречанюк, Фізична хімія і хімія силікатів: підручник. Київ, Україна: Кондор, 2006.
Т. Е. Римар, "Дослідження впливу НВЧ випромінювання на властивості гранульованих теплоізоляційних матеріалів на основі рідинного скла", Збірник наукових праць УкрДУЗТ, вип. 196, с. 6-16, Харків, 2021.
И. Именохоев, Х. Виндсхаймер, Р. Вайтц, Н. Кинтсель, и Х. Линн, "Технология СВЧ-нагрева: потенциал и границы". [Электронный ресурс]. Режим доступа: https://www.linn-high-therm.de/fileadmin/user_upload/pages/about_us/download/publications/white_papers/MikrowellenerwaermungRus.pdf.
"Установки для вспучивания вермикулита VERMIC". [Электронный ресурс]. Режим доступа: http://tsc-technologies.ru/ru/oborudovanie/ustanovki-dlyavspuchivaniya-vermikulita-vermic/.
Downloads
Published
How to Cite
Issue
Section
URN
License
Copyright (c) 2023 Tatyana Rymar
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The authors who publish in this journal agree to the following terms:The authors reserve the right to authorship of their work and give the journal the right to first publish this work under the terms of the Creative Commons Attribution License CC BY-NC, which allows other persons to freely distribute published work with a mandatory reference to authors of the original work and the first publication of the work in this journal.
Authors have the right to conclude separate additional agreements for the non-exclusive distribution of the paper in the form in which it was published by this journal (for example, posting work in electronic repository or publishing as part of a monograph), provided that the link to the first publication in this journal is maintained.
The journal policy allows and encourages authors to post on the Internet (for example, in repositories of institutions or on personal websites) the manuscript of work, both before the submission of this manuscript to the editorial staff, and during its editorial work, as it contributes to the emergence of productive scientific discussion and positively affects the efficiency and dynamics of published work citation (see The Effect of Open Access).
