Mitsubishi Kakoki Kaisha has been developing a compressor and an hydrogen delivery system in use of hydrogen absorbing alloy, and is working with Nasu Denki-Tekko to make technical developments and examinations aiming for commercial use.

For the compressor, the company is going to make a technical development so that the hydrogen discharge temperature can be reduced from the current 250℃ down to 200℃. Regarding the delivery system, examinations will be made repeatedly and PR activities will be carried out continuously.

In the autumn of 2020, the compressor for the verification using an hydrogen absorbing alloy was also completed successfully attaining 19.6 MPa at 1Nm3/h in collaboration with Kobe Material Testing Laboratory Group. It is characteristic that they utilized the discharging pressure of absorbed hydrogen making the best use of the properties of hydrogen absorbing alloy to raise pressure.

The hydrogen absorbing alloy absorbs hydrogen when cooled down and discharges it when heated. By means of using an unused heating energy, a low-cost and maintenance-free compressor was born without any mechanical energy like a reciprocating or a diaghragm type using an unused heat energy.

According to Mitsubishi Kakoki Kaisha, the hyddrogen discharging temperature for verification has been set at 250℃ for easier utilization of the heat exhausted from plants. The company intends to make further development of technology to enable use at a lower temperature of 200℃.In addition, with Nippon Filcon the company is also conducting the development and verification of a delivery system. The feature is that the hydrogen absorbing alloy and its container weighed so lighter as half of the current products of the company. So, it can be loaded on the trucks which transport high-pressure gas containers. It follows that delivery costs could be controlled using the existing delivery network.
The developed system is a delivery type of the stationary hydrogen absorbing system named “MH-QUON” sold by Nasu Denki-Tekko. The hydrogen alloy and its container are made so much light-weighing from 125kg to 65 kg by wall thinning.

Furthermore, the setting position changed from horizontal to upright has made possible the absorbing/discharging of hydrogen keeping the detachable function. The company is going to take advantage of it to supply blue hydrogen by combining small-sized on-site hydrogen generator “HyGeia” of Mitsubishi Kakoki Kaisha.

The company started a demonstrative lease to event sites in 2022 and is now making PR activities. Nasu Denki-Tekko has already completed the development as a system and is going to make PR activities aiming to commercialize it from now on. At present the piping arrangements operational works are being carried out by the company and Nippon Filcon which supplies fuel cells, but in future they plan to build up a system with which everybody can supply hydrogen just by pushing a button. .