Wyniki wyszukiwania - BazTech

1

The use of renewable energy in the form of methane via electrolytic hydrogen generation

Hashimoto K., Kumagai N., Izumiya K., Takano H., Żabiński P. R., El-Moneim A. A., Yamasaki M., Kato Z., Akiyama E., Habazaki H.

Archives of Metallurgy and Materials

|

2013

|

Vol. 58, iss. 1

231-239

EN

Extrapolation of world energy consumption from 1990 to 2010 indicates the complete exhaustion of world reserves of oil, natural gas, uranium and coal by 2040, 2043, 2046 and 2053, respectively. For the survival of all people in the whole world, intermittent and fluctuating electricity generated from renewable energy should be supplied in the form of usable fuel to all people in the whole world. We have been working on research and development of global carbon dioxide recycling for the use of renewable energy in the form of methane via electrolytic hydrogen generation using carbon dioxide as the feedstock. We created energy-saving cathodes for hydrogen production, anodes for oxygen evolution without chlorine formation in seawater electrolysis, and catalysts for methanation of carbon dioxide and built pilot plants of industrial scale. Recent advances in materials are described. Industrial applications are in progress.

PL

Ekstrapolacja światowego zużycia energii z lat 1990-2010 wskazuje, że całkowite wyczerpanie światowych zasobów ropy naftowej nastąpi w 2040 roku, gazu ziemnego w 2043 roku, uranu w 2046 roku a węgla w 2053 roku. Dla przetrwania ludzkości na całym świecie energia elektryczna powinna być generowana z odnawialnego zródła w formie paliwa dostępnego dla kazdego. Opracowano technologie globalnego recyklingu dwutlenku wegla i zastosowania metanu jako formy odnawialnej energii generowanej poprzez uwodornienie CO2 wodorem produkowanym podczas elektrolizy wody morskiej. Opracowano energooszczedne katody do produkcji wodoru, anody do produkcji tlenu bez towarzyszącej temu emisji gazowego chloru podczas elektrolizy wody morskiej oraz katalizatory stosowane w procesie uwodornienia dwutlenku węgla. Wybudowano również pilotażowa instalacje w skali przemysłowej. Praca opisuje ostatnie postępy w industrializacji procesu.

2

Employment of concentrated-hardsphere-suspension pad for V-bending of thin strip

Ohashi T., Chiba H., Takano H.

Journal of Achievements in Materials and Manufacturing Engineering

|

2008

|

Vol. 31, nr 2

699-704

EN

Purpose: Authors have suggested employment of dilatant fluid for metal forming tools, and report an application on v-bending of thin stainless steel strips in this paper. Design/methodology/approach: An alumina concentrated hard-sphere suspension is employed as dilatant fluid for forming. The authors evaluate the suspension with backward extrusion test. Then, the authors try to bend SUS304 stainless strip with 0.25 mm thickness and 30 mm width on the pad of the suspension with a v-bend punch. Findings: Behaviour of the suspension is revealed in backward extrusion test. Migration of water takes important role in it. In v-bending test, including acute angle bending, the authors bend the strip with only the v-bend punch and the alumina concentrated hard-sphere suspension pad successfully. It is thought that forming load is less than with general polyurethane tools. Research limitations/implications: Spring-back in partial bending, which is similar to the suggested process, is larger than in bottoming and coining with dies and bending with polyurethane tools. Therefore, the authors are going to evaluate the spring-back in the suggested process in further study. Practical implications: Polyurethane pad is used in bending process generally because of advantageous points in easy-design, and safe from scratch. However it has disadvantageous points in its limited life and necessity of large forming load. The alumina concentrated hard-sphere suspension can be employed for such the pad with unlimited life. In addition, such the dilatant fluid can be applied on other metal forming process as easy tool. Originality/value: Employing dilatant fluid for forming tools is new idea. Authors try v-bending with an alumina concentrated hard-sphere suspension.

3

Employment of alumina suspension pad for v-bending of SUS304 strip

Ohashi T., Chiba H., Takano H.

Archives of Materials Science and Engineering

|

2008

|

Vol. 30, nr 1

57-60

EN

Purpose: Authors have suggested employment of dilatant fluid for metal forming tools, and report an application on v-bending of thin stainless steel strips in this paper. Design/methodology/approach: An alumina concentrated hard-sphere suspension is employed as dilatant fluid for forming. The authors evaluated the suspension with backward extrusion test. Followed by SUS304 stainless strip with 0.25mm thickness and 30mm width on the pad of the suspension with a v-bend punch. Findings: Behaviour of the suspension is revealed in the backward extrusion test. Migration of water takes important role in it. In v-bending test, including acute angle bending, the authors bend the strip with only the vbend punch and the alumina concentrated hard-sphere suspension pad successfully. It is thought that forming load is less than with general polyurethane tools. Research limitations/implications: Spring-back in partial bending, which is similar to the suggested process, is larger than in bottoming and coining with dies and bending with polyurethane tools. Therefore, the authors will evaluate the spring-back in the suggested process in further study. Practical implications: Polyurethane pad is used in bending process generally because of advantageous points in easy-design, and safe from scratch. However it has disadvantageous points in its limited life and necessity of large forming load. The alumina concentrated hard-sphere suspension can be employed for such a pad with unlimited life. In addition, such dilatant fluid can be applied on other metal forming process as easy tool. Originality/value: Employing dilatant fluid for forming tools is new idea. V-bending with an alumina concentrated hard-sphere suspension was attempted.