| Project/Area Number |
09555219
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Material processing/treatments
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| Research Institution | Osaka Prefecture University |
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Principal Investigator |
NISHIMURA Rokuro (1999) COLLEGE OF OSAKA PREFECTURE UNIVERSITY, ASSOCIATE PROFESSOR, 工学部, 助教授 (90110634)
山川 宏二 (1997-1998) 大阪府立大学, 工学部, 教授 (00026189)
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| Co-Investigator(Kenkyū-buntansha) |
SHINOHARA Takanobu TOYO ENGINEERING LTD., HEAD OF RESEARCH CENTER, 研究所員
西村 六郎 大阪府立大学, 工学部, 助教授 (90110634)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥10,300,000 (Direct Cost: ¥10,300,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1998: ¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1997: ¥5,100,000 (Direct Cost: ¥5,100,000)
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| Keywords | HYDROGEN SENSOR / HYDROGEN CONTENT / HYDROGEN DIFFUSION CONEFFICIENT / HYDROGEN PERMEABILITY / STEELS / PLANT / HYDROGEN ATTACK / LONG TERM MEASUREMENT |
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| Research Abstract |
With regard to the chemical plant typified by oil refineries in which high pressure hydrogen gas is treated a high temperature, it is very important to develop the high temperature type hydrogen sensor by which hydrogen attack is predicted. Through three years' project, the following results were obtained :
(1) The developed hydrogen sensor, which can detect hydrogen permeation current, was found to keep reliability and stability over 2000 hours through the measurement of hydrogen permeation current, when it was attached on plants in service.
(2) On the basis the results obtained in service, it was evaluated whether or not the materials under operation lies in safety for hydrogen attack, using the value of the hydrogen parameter (that is, hydrogen diffusion coefficient) and the modified Nelson chart under several assumptions.
(3) By using the hydrogen sensor, the behavior of hydrogen permeation current was confirmed to depend upon material texture and the size/distribution of carbides.
(4) It is found that hydrogen permeation current is controlled by grain size when grain grows, while it is controlled by the size/distribution of carbides when grain shows no growth.
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