Devolopment of MRI-monitoring method to obtain the map of gas-storage ratio in gas-hydrate mash and MRI observation of Time-evolution maps of gas-storage ratio in hydrate formation process

Kuniyasu Ogawa, Yoshirou Kawasoe, Tomoyuki Haishi, Shin Utsuzawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Utilization of gas-hydrates as a gas-storage medium has a possibility of highly economical transport and safety storage of natural gas. Based on the idea, a development of industrial techniques for high-rate formation of gas-hydrates with high gas-storage ratio is required. In order to improve the method to form gas-hydrate mash with high-storage ratio, a new method for monitoring gas-storage ratio map in gas-hydrate mash by magnetic resonance imaging (MRI) was developed. In this study, gas-hydrate mash was formed from HFC-32 and water in the nonmagnetic high-pressure vessel with fine-bubble injection and mixing paddles, and MR images of gas-hydrate mash were obtained using a portable MR microscope. At a same time, fluid motion of a hydrate mash mixed by the paddle was also observed through the vessel with transparence glass-cylinder using optical camera. The spin-lattice relaxation time, T1, and the spin-spin relaxation time, T2, of a uniform mixing hydrate mash were obtained quantitatively as a function of the gas-storage ratio, which is defined as the ratio of the net gas-volume including in a gas-hydrate mash to the water volume in the vessel. It was obtained experimentally that both relaxation times T1 and T2 did not change from the relaxation times of distilled water before gas-hydrate formation. Based on the results, it was shown that a linear relationship is established between the NMR signal intensity from gas-hydrate mash and the gas-storage ratio in it the derived equation agress to the experimental result measured by gas-hydrate mash mixed uniformly by the paddle. Using the equation, the maps of the gas-storage ratio in a hydrate mash can be quantitatively calculated from MR images. This method was applied to the non-uniform measurement of the gas-storage ratio formed in the gas-hydrate mash under non-uniformly mixing condition. The formation mechanism of the gas-hydrate mash with non-uniform ratio was discussed from the obtained maps of gas-storage ratio and the observation of fluid motion using optical method.

Original languageEnglish
Pages (from-to)3204-3211
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume70
Issue number700
Publication statusPublished - 2004 Dec

Fingerprint

Gas hydrates
Magnetic resonance
Hydrates
hydrates
magnetic resonance
Imaging techniques
Monitoring
gases
Relaxation time
paddles
relaxation time
Water
Fluids
Spin-lattice relaxation
vessels
Pressure vessels
Natural gas
Microscopes
water
Cameras

Keywords

  • Bubbling and Mixing Method
  • Gas-hydrates
  • Gas-storage Ratio
  • Hydrate Formation Process
  • Magnetic Resonance Imaging
  • Monitoring
  • T1 and T2 Relaxation Time

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

@article{4a5da3a6c99e411ba30144a7f0a8fa81,
title = "Devolopment of MRI-monitoring method to obtain the map of gas-storage ratio in gas-hydrate mash and MRI observation of Time-evolution maps of gas-storage ratio in hydrate formation process",
abstract = "Utilization of gas-hydrates as a gas-storage medium has a possibility of highly economical transport and safety storage of natural gas. Based on the idea, a development of industrial techniques for high-rate formation of gas-hydrates with high gas-storage ratio is required. In order to improve the method to form gas-hydrate mash with high-storage ratio, a new method for monitoring gas-storage ratio map in gas-hydrate mash by magnetic resonance imaging (MRI) was developed. In this study, gas-hydrate mash was formed from HFC-32 and water in the nonmagnetic high-pressure vessel with fine-bubble injection and mixing paddles, and MR images of gas-hydrate mash were obtained using a portable MR microscope. At a same time, fluid motion of a hydrate mash mixed by the paddle was also observed through the vessel with transparence glass-cylinder using optical camera. The spin-lattice relaxation time, T1, and the spin-spin relaxation time, T2, of a uniform mixing hydrate mash were obtained quantitatively as a function of the gas-storage ratio, which is defined as the ratio of the net gas-volume including in a gas-hydrate mash to the water volume in the vessel. It was obtained experimentally that both relaxation times T1 and T2 did not change from the relaxation times of distilled water before gas-hydrate formation. Based on the results, it was shown that a linear relationship is established between the NMR signal intensity from gas-hydrate mash and the gas-storage ratio in it the derived equation agress to the experimental result measured by gas-hydrate mash mixed uniformly by the paddle. Using the equation, the maps of the gas-storage ratio in a hydrate mash can be quantitatively calculated from MR images. This method was applied to the non-uniform measurement of the gas-storage ratio formed in the gas-hydrate mash under non-uniformly mixing condition. The formation mechanism of the gas-hydrate mash with non-uniform ratio was discussed from the obtained maps of gas-storage ratio and the observation of fluid motion using optical method.",
keywords = "Bubbling and Mixing Method, Gas-hydrates, Gas-storage Ratio, Hydrate Formation Process, Magnetic Resonance Imaging, Monitoring, T1 and T2 Relaxation Time",
author = "Kuniyasu Ogawa and Yoshirou Kawasoe and Tomoyuki Haishi and Shin Utsuzawa",
year = "2004",
month = "12",
language = "English",
volume = "70",
pages = "3204--3211",
journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",
issn = "0387-5016",
publisher = "Japan Society of Mechanical Engineers",
number = "700",

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TY - JOUR

T1 - Devolopment of MRI-monitoring method to obtain the map of gas-storage ratio in gas-hydrate mash and MRI observation of Time-evolution maps of gas-storage ratio in hydrate formation process

AU - Ogawa, Kuniyasu

AU - Kawasoe, Yoshirou

AU - Haishi, Tomoyuki

AU - Utsuzawa, Shin

PY - 2004/12

Y1 - 2004/12

N2 - Utilization of gas-hydrates as a gas-storage medium has a possibility of highly economical transport and safety storage of natural gas. Based on the idea, a development of industrial techniques for high-rate formation of gas-hydrates with high gas-storage ratio is required. In order to improve the method to form gas-hydrate mash with high-storage ratio, a new method for monitoring gas-storage ratio map in gas-hydrate mash by magnetic resonance imaging (MRI) was developed. In this study, gas-hydrate mash was formed from HFC-32 and water in the nonmagnetic high-pressure vessel with fine-bubble injection and mixing paddles, and MR images of gas-hydrate mash were obtained using a portable MR microscope. At a same time, fluid motion of a hydrate mash mixed by the paddle was also observed through the vessel with transparence glass-cylinder using optical camera. The spin-lattice relaxation time, T1, and the spin-spin relaxation time, T2, of a uniform mixing hydrate mash were obtained quantitatively as a function of the gas-storage ratio, which is defined as the ratio of the net gas-volume including in a gas-hydrate mash to the water volume in the vessel. It was obtained experimentally that both relaxation times T1 and T2 did not change from the relaxation times of distilled water before gas-hydrate formation. Based on the results, it was shown that a linear relationship is established between the NMR signal intensity from gas-hydrate mash and the gas-storage ratio in it the derived equation agress to the experimental result measured by gas-hydrate mash mixed uniformly by the paddle. Using the equation, the maps of the gas-storage ratio in a hydrate mash can be quantitatively calculated from MR images. This method was applied to the non-uniform measurement of the gas-storage ratio formed in the gas-hydrate mash under non-uniformly mixing condition. The formation mechanism of the gas-hydrate mash with non-uniform ratio was discussed from the obtained maps of gas-storage ratio and the observation of fluid motion using optical method.

AB - Utilization of gas-hydrates as a gas-storage medium has a possibility of highly economical transport and safety storage of natural gas. Based on the idea, a development of industrial techniques for high-rate formation of gas-hydrates with high gas-storage ratio is required. In order to improve the method to form gas-hydrate mash with high-storage ratio, a new method for monitoring gas-storage ratio map in gas-hydrate mash by magnetic resonance imaging (MRI) was developed. In this study, gas-hydrate mash was formed from HFC-32 and water in the nonmagnetic high-pressure vessel with fine-bubble injection and mixing paddles, and MR images of gas-hydrate mash were obtained using a portable MR microscope. At a same time, fluid motion of a hydrate mash mixed by the paddle was also observed through the vessel with transparence glass-cylinder using optical camera. The spin-lattice relaxation time, T1, and the spin-spin relaxation time, T2, of a uniform mixing hydrate mash were obtained quantitatively as a function of the gas-storage ratio, which is defined as the ratio of the net gas-volume including in a gas-hydrate mash to the water volume in the vessel. It was obtained experimentally that both relaxation times T1 and T2 did not change from the relaxation times of distilled water before gas-hydrate formation. Based on the results, it was shown that a linear relationship is established between the NMR signal intensity from gas-hydrate mash and the gas-storage ratio in it the derived equation agress to the experimental result measured by gas-hydrate mash mixed uniformly by the paddle. Using the equation, the maps of the gas-storage ratio in a hydrate mash can be quantitatively calculated from MR images. This method was applied to the non-uniform measurement of the gas-storage ratio formed in the gas-hydrate mash under non-uniformly mixing condition. The formation mechanism of the gas-hydrate mash with non-uniform ratio was discussed from the obtained maps of gas-storage ratio and the observation of fluid motion using optical method.

KW - Bubbling and Mixing Method

KW - Gas-hydrates

KW - Gas-storage Ratio

KW - Hydrate Formation Process

KW - Magnetic Resonance Imaging

KW - Monitoring

KW - T1 and T2 Relaxation Time

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JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

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