Untersuchung von funktionsintegrierten 3Dgedruckten Sintermetallfiltern für das Design eines Metallhydrid-Reaktors

Kurzfassung

In this work, porous additively manufactured filters are investigated and characterized for their pressure drop in the range of vacuum absolute pressures and their filter efficiency. For this purpose, different filter geometries and values of porosity are investigated. The geometries used are flat filters and cartridge filters of various thicknesses. A total of three values of porosity were investigated (7%, 26% and 36%). It turns out that the pressure drop is highest for the filter with the lowest porosity. Similarly, the cartridge filters have a much lower pressure drop than the flat filters. Overall, data sets can be determined for the pressure drop as a function of standard volume flows of 0.25-5 lN/min in the pressure range of 30-860 mbar, which are also related to the respective face velocity. For the filter efficiency, no exact statement can be made with the available means. In the second part of the work, three concepts for metal hydride reactors were developed for the targeted setting of a gas pressure in vacuum, with the aim of enabling the most targeted, dynamic and efficient reaction operation possible. For this purpose, the approach of thermal separation of reaction material and housing as well as a lightweight construction concept are used. One of the previously characterized porous filters was used and integrated for the three reactor systems. Thermal decoupling is achieved by combinations of different thermally conductive materials: aluminum with PTFE and stainless steel, respectively. Functional demonstrations of all three reactors are presented, furthermore the thermal behavior is analyzed and first operation modes are recommended. The thermal decoupling of the PTFE reactor makes the heating very efficient, achieving a complete reaction conversion and thus pressure build-up of ∆p=965mbar in less than 6 minutes with minimal energy input (38 kJ). The reverse process occurs with a required energy input of 61 kJ within 27 minutes. With passive cooling, the energy input would be omitted, but the dynamics would suffer.