Development of a metal hydride compressor

K. Nomura, Etsuo Akiba, S. Ono

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The National Chemical Laboratory for Industry (NCL) model 4 chemical engine has been completed. This is a type of hydrogen compressor using LaNi5 as the energy conversion medium. The container, consisting of 19 copper tube elements with aluminium inner fins and covered with a stainless steel heat-insulated water jacket, is filled with 18.9 mol of LaNi5. The compressor is composed of a pair of these containers, two electrical boilers (9 kW), a circulating pump, valves and other components. The container is able to absorb 1.3 m3 (at normal temperature and pressure (NTP)) of hydrogen and the time needed for preheating (90 °C) and cooling (27 °C) is less than 3 min. In the present investigation, using this container, the basic operating characteristics such as the hydrogen-absorbing and hydrogen-desorbing ability, the thermal efficiency, the heat transfer coefficient and the reaction velocity have been examined. Because of the circulating hot water (90 °C; 30 1 min-1), the NCL model 4 compressor is able to desorb 360 1 min-1 (NTP) of high pressure (18-12 atm) hydrogen gas continuously in 3 min. However, this is its maximum ability under stable conditions. The overall heat transfer coefficient estimated is about 300-1200 kcal m-2 h-1 °C-1. Using a plunger pump, the NCL model 4 compressor has been combined with a reverse osmosis type of desalination apparatus and a practical test is now under way.

Original languageEnglish
Pages (from-to)551-558
Number of pages8
JournalJournal of the less-common metals
Volume89
Issue number2
DOIs
Publication statusPublished - Jan 1 1983

Fingerprint

Hydrides
Chemical laboratories
Compressors
Hydrogen
Metals
Containers
Heat transfer coefficients
Pumps
Industry
Water
Preheating
Stainless Steel
Reverse osmosis
Desalination
Aluminum
Energy conversion
Boilers
Copper
Stainless steel
Gases

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Development of a metal hydride compressor. / Nomura, K.; Akiba, Etsuo; Ono, S.

In: Journal of the less-common metals, Vol. 89, No. 2, 01.01.1983, p. 551-558.

Research output: Contribution to journalArticle

Nomura, K. ; Akiba, Etsuo ; Ono, S. / Development of a metal hydride compressor. In: Journal of the less-common metals. 1983 ; Vol. 89, No. 2. pp. 551-558.
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