Auslegung und Bau eines thermischen Wasserstoffkompressors auf der Basis von Metallhybriden
Auslegung und Bau eines thermischen Wasserstoffkompressors auf der Basis von Metallhybriden
In the present study a thermal hydrogen compressor based on metal hydrides is studied as an alternative to conventional processes for the compression of hydrogen with low volumetric flowrates in the range of a few normal cubic meters per hour. The absorption- and desorption-reaction of these alloys...
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Personal Name(s): | Bonhoff, K. (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1998
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Physical Description: |
IV, 131 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3571 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
In the present study a thermal hydrogen compressor based on metal hydrides is studied as an alternative to conventional processes for the compression of hydrogen with low volumetric flowrates in the range of a few normal cubic meters per hour. The absorption- and desorption-reaction of these alloys with hydrogen takes place at different equilibrium pressures depending on temperature. This behavior is used to compress hydrogen by suplying heat. The main focus of this work is the experimental evaluation of an apparatus that compresses hydrogen in two stages up to 120 bar and that is supplied only with thermal energy. The metal hydrides chosen are of the AB$_{2}$-structure consisting mainly of Titanium and Manganese. They have been aplied due to the fact that the heat of desorption is provided at a temperature level of 100 °C. A model that is derived from the experiments and that is in good agreement with their results describes the volumetric hydrogen flow and the specific heat consumption as a function of the desorption parameters pressure and temperature as well as the desorption time. The Performance of the thermal hydrogen compressor can be optimized within the limits of safety consideration by reducing the void space in the reactor vessels that contain the metal hydride and by changing the construction of these vessels. Having in mind the application of a thermal hydrogen compressor the cyclic stability of the metal hydride plays a major role. The Jong-time studies, in which the metal hydride was loaded and unloaded in a cyclic Operation mode using different hydrogen qualities show the need to purify the hydrogen, which is produced in an electrolyser, in order to maintain the capacity of the metal hydride. Finally the calculations concerning the sizing of the solar collectors for the heat supply lead to the conclusion that almost half of the Investment costs are due the heat supply system, when 100 % of the heat needed for the compression is covered by solar energy. |