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Bauhaus Luftfahrt Jahrbuch 2018

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45<br />

Funktionsweise des<br />

Partikelreaktors<br />

Die Partikel des reaktiven Materials werden bei hohen<br />

Temperaturen reduziert (rot, oben), durchlaufen einen<br />

Gegenstromwärmeübertrager und werden bei niedrigeren<br />

Temperaturen unter Bildung von Synthesegas (H 2 , CO)<br />

oxidiert (blau, unten).<br />

Operating principle<br />

of the particle reactor<br />

Particles of the reactive material are reduced at high<br />

temperatures (red, upper side), moved through a<br />

counter-flow heat exchanger and are reoxidised at lower<br />

temperatures (blue, lower side), producing synthesis<br />

gas (H 2 , CO).<br />

Source: Falter, C., & Pitz-Paal, R. (<strong>2018</strong>). Modeling counter-flow particle<br />

heat exchangers for two-step solar thermochemical syngas production.<br />

Applied Thermal Engineering, 132, pp. 613–623. doi: 10.1016/j.applthermaleng.<br />

2017.12.087<br />

H 2 O, CO 2<br />

O 2<br />

H 2 ,CO<br />

T<br />

∆r<br />

+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +<br />

Wirkungsgrad des Wärmeübertragers<br />

im Partikelreaktor<br />

Der Wärmeübergang im Reaktor ist entscheidend von der Durchmischung<br />

der Partikel abhängig und wird zu kleinen Schichtdicken<br />

des Partikelbettes (∆r, Abbildung oben) maximiert.<br />

Efficiency of heat transfer in the<br />

particle reactor<br />

Heat transfer in the reactor is crucially dependent on the level of<br />

mixing of the particles and is maximised towards small thicknesses<br />

of the particle bed (∆r, figure above).<br />

Heat exchanger effectiveness εhe<br />

80 %<br />

70 %<br />

60 %<br />

50 %<br />

40 %<br />

30 %<br />

20 %<br />

10 %<br />

0 %<br />

0 0.01<br />

Perfect mixing<br />

No mixing<br />

0.02 0.03 0.04 0.05<br />

∆r of hot particle bed [m]<br />

Source: Falter, C., & Pitz-Paal, R. (<strong>2018</strong>). Modeling counter-flow particle heat exchangers for two-step solar thermochemical syngas production. Applied Thermal Engineering, 132,<br />

pp. 613–623. doi: 10.1016/j.applthermaleng.2017.12.087

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