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Study on molecular controlled mining system of methane hydrate; Methane hydrate no bunshi seigyo mining ni kansuru kenkyu

Abstract

Basic studies are conducted for the collection of methane from the methane hydrate that exists at levels deeper than 500m in the sea. The relationship between the hydrate generation mechanism and water cluster structure is examined by use of mass spectronomy. It is found that, among the stable liquid phase clusters, the (H2O)21H{sup +} cluster is the most stable. Stable hydrate clusters are in presence in quantities, and participate in the formation of hydrate crystal nuclei. For the elucidation of the nucleus formation mechanism, a kinetic simulation is conducted of molecules in the cohesion system consisting of water and methane molecules. Water molecules that array near methane molecules at the normal pressure is disarrayed under a higher pressure for rearray into a hydrate structure. Hydrate formation and breakdown in the three-phase equilibrium state of H2O, CH4, and CO2 at a low temperature and high pressure are tested, which discloses that supercooling is required for formation, that it is possible to extract CH4 first for replacement by guest molecule CO2 since CO2 is stabler than CH4 at a lower pressure or higher temperature, and that formation is easier to take place when the grain diameter is larger at the formation point  More>>
Authors:
Kuriyagawa, M; Saito, T; Kobayashi, H; Karasawa, H; Kiyono, F; Nagaoki, R; Yamamoto, Y; Komai, T; Haneda, H; Takahashi, Y; [1]  Nada, H [2] 
  1. National Institute for Resources and Environment, Tsukuba (Japan)
  2. Science and Technology Agency, Tokyo (Japan)
Publication Date:
Feb 01, 1997
Product Type:
Conference
Report Number:
CONF-970283-
Reference Number:
SCA: 299000; 540120; PA: NEDO-97:820048; EDB-97:106625; SN: 97001821142
Resource Relation:
Conference: Report meeting for the results of `the publicly applied proposal type and hi-tech (emphasized) field research and development in fiscal 1995`, 1995 nendo teian kobogata saisentan (juten) bun`ya kenkyu kaihatsu seika hokokukai, Tokyo (Japan), 12-14 Feb 1997; Other Information: PBD: Feb 1997; Related Information: Is Part Of Preprint of the results of `the publicly applied proposal type and hi-tech (emphasized) field research and development in fiscal 1995`; PB: 469 p.; `1995 nendo teian kobogata saisentan (juten) bun`ya kenkyu kaihatsu` seika hokokukai yokoshu
Subject:
29 ENERGY PLANNING AND POLICY; 54 ENVIRONMENTAL SCIENCES; METHANE; HYDRATES; CRYSTALS; MINING ENGINEERING; SEA BED; HIGH PRESSURE; MOLECULES; THERMODYNAMIC MOLECULAR MODEL; SIMULATION
OSTI ID:
506686
Research Organizations:
New Energy and Industrial Technology Development Organization, Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE97757283; TRN: 97:820048
Availability:
Available from New Energy and Industrial Technology Development Organization, Sunshine 60, 30F 1-1, 3-chome, Higashi-Ikebukuro, Toshima-ku, Tokyo, Japan; OSTI as DE97757283
Submitting Site:
NEDO
Size:
pp. 414-415
Announcement Date:
Aug 23, 1997

Citation Formats

Kuriyagawa, M, Saito, T, Kobayashi, H, Karasawa, H, Kiyono, F, Nagaoki, R, Yamamoto, Y, Komai, T, Haneda, H, Takahashi, Y, and Nada, H. Study on molecular controlled mining system of methane hydrate; Methane hydrate no bunshi seigyo mining ni kansuru kenkyu. Japan: N. p., 1997. Web.
Kuriyagawa, M, Saito, T, Kobayashi, H, Karasawa, H, Kiyono, F, Nagaoki, R, Yamamoto, Y, Komai, T, Haneda, H, Takahashi, Y, & Nada, H. Study on molecular controlled mining system of methane hydrate; Methane hydrate no bunshi seigyo mining ni kansuru kenkyu. Japan.
Kuriyagawa, M, Saito, T, Kobayashi, H, Karasawa, H, Kiyono, F, Nagaoki, R, Yamamoto, Y, Komai, T, Haneda, H, Takahashi, Y, and Nada, H. 1997. "Study on molecular controlled mining system of methane hydrate; Methane hydrate no bunshi seigyo mining ni kansuru kenkyu." Japan.
@misc{etde_506686,
title = {Study on molecular controlled mining system of methane hydrate; Methane hydrate no bunshi seigyo mining ni kansuru kenkyu}
author = {Kuriyagawa, M, Saito, T, Kobayashi, H, Karasawa, H, Kiyono, F, Nagaoki, R, Yamamoto, Y, Komai, T, Haneda, H, Takahashi, Y, and Nada, H}
abstractNote = {Basic studies are conducted for the collection of methane from the methane hydrate that exists at levels deeper than 500m in the sea. The relationship between the hydrate generation mechanism and water cluster structure is examined by use of mass spectronomy. It is found that, among the stable liquid phase clusters, the (H2O)21H{sup +} cluster is the most stable. Stable hydrate clusters are in presence in quantities, and participate in the formation of hydrate crystal nuclei. For the elucidation of the nucleus formation mechanism, a kinetic simulation is conducted of molecules in the cohesion system consisting of water and methane molecules. Water molecules that array near methane molecules at the normal pressure is disarrayed under a higher pressure for rearray into a hydrate structure. Hydrate formation and breakdown in the three-phase equilibrium state of H2O, CH4, and CO2 at a low temperature and high pressure are tested, which discloses that supercooling is required for formation, that it is possible to extract CH4 first for replacement by guest molecule CO2 since CO2 is stabler than CH4 at a lower pressure or higher temperature, and that formation is easier to take place when the grain diameter is larger at the formation point since larger grain diameters result in a higher formation temperature. 3 figs.}
place = {Japan}
year = {1997}
month = {Feb}
}