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Project NTP

Project NTP. Van Ortega Cayetano Shama Karu Sean McKeown Themistoklis Zacharatos Advisor: Dr. Woo Lee Plasma Specialist: Dr. Kurt Becker. Powered by:. Gas Flow. Design Considerations: . Explanation of previous design: Constriction of gas flow through the plasma source.

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Project NTP

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  1. Project NTP Van Ortega Cayetano Shama Karu Sean McKeown Themistoklis Zacharatos Advisor: Dr. Woo Lee Plasma Specialist: Dr. Kurt Becker Powered by:

  2. Gas Flow Design Considerations: Explanation of previous design: • Constriction of gas flow through the plasma source. • The constriction can also take the form of a wide slit -- or a straight row of holes, which works well for large-scale applications. Current designs are being modeled from this perspective.

  3. “Hour glass” Design Gas Flow • constricts gas flow • narrow space necessary for plasma discharge • requires sealant for joints • assembly needs stability (brace) • requires interface with mass flow meter

  4. Multi-tube Design Quartz tubing Capillary tubes • rigid • narrow space necessary for plasma discharge • requires interface with mass flow meter

  5. Plasma Chemistry – the CH4 Decomposition Reaction Table 12.3: Considered gross reactions for the plasma conditions given in Table 12.2. Constant: Reaction: V1 2 CH4 + e- C2H2 + 3H2 + e- V2 2 CH4 + e-  C2H4 + 2H2 + e- V3 2 CH4 + e-  C2H6 + H2 + e- V4 CH4 + e-  C2H2 + H2 + e- V5 CH4 + e-  C2H4 + H2 + e-. E1 Cwall + 2 H2 + e-  CH4 + e- E2 Cwall + .5H2 + e-  .5 C2H2 + e- E3 Cwall + H2 + e-  .5 C2H4 + e- E4 Cwall + 1.5H2 + e-  .5 C2H6 + e-.

  6. Experiment - from “Low-Temperature Plasma Physics” by Hippler, Pfau, Schmidt, and Schoenbach Reference: Yu. Gerasimov, T.A. Graecheva, Yu. Lebedev: Chim. Vys. Energii, vol. 17, pp 270 (1983)

  7. Reformation of CH4 to obtain H2 • The referenced experiment (previous slide) analyzed the conversion of methane to its elements under different power inputs and energy concentrations. Showed diminishing returns: the endothermic reformation reaction has a high rate-per-unit-energy at low energy inputs. • In most atmospheric-pressure non-equilibrium discharges the desired chemical changes are due to free radical reactions rather than to the direct action of electrons or ions (Low Temperature Plasma Physics, pp. 337) • Reaction kinetics will require more analysis, to understand the effect of free radicals on methane reformation.

  8. Gantt Chart – November Time per week: 20-25 hrs

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