E3S Web of Conf.
Volume 230, 2021IV International Scientific and Technical Conference “Gas Hydrate Technologies: Global Trends, Challenges and Horizons” (GHT 2020)
|Number of page(s)||11|
|Published online||18 January 2021|
Design and numerical simulation of a microwave antenna with coaxial slots for preventing secondary formation of gas hydrate
1 Jilin University, College of Construction Engineering, 938 Ximinzhu St, 130061, Changchun, China
2 Dnipro University of Technology, Department of Mining Engineering and Education, 19 Yavornytskoho, 49005 Dnipro, Ukraine
3 Oles Honchar Dnipro National University, Department of Fluid Mechanics and Energy & Mass Transfer, 72 Haharina Ave., 49089, Dnipro, Ukraine
4 Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources / Investigation and Research Center for Marine Petroleum and Gas, China Geological Survey, Guangzhou Marine Geological Survey, Guangzhou, 510075, Guangdong, China
* Corresponding author: firstname.lastname@example.org
Gas hydrate is a new clean energy resource with polar molecule. However due to the change of temperature and pressure during extraction process, there will be secondary formation of gas hydrate, which usually occurs in reservoirs or pipelines near the wellhead. It is significance to prevent secondary formation of hydrate because of safety issues or production rate reduction caused by it. Theoretically, microwave heating can accelerate the decomposition of gas hydrate. Therefore, it is possible to use microwave radiation to prevent secondary formation of hydrate. In this paper, a microwave antenna with special shaped coaxial-slots was designed. Based on electromagnetics and antenna transmission theories, the key parameters of the coaxial-slot antenna were calculated. The frequency is 2.45 GHz, the impedance is 50 ohms, and ratio of outer to inner conductor radius is 3.32. The slots were designed as ‘H’-shape with the width is 2 mm, the radial length is 12mm, the axial length is 14 mm and the interval is 35 mm. Teflon was used as filling material and the radome. Then the software HFSS and ANSYS were used to analyze the electromagnetic field and temperature field to further optimize the parameters. It will be proved that the microwave antenna can heat gas hydrate and prevent the secondary formation.
© The Authors, published by EDP Sciences, 2021
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