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“ Bulk Gas Generation and Storage Systems of the Mars Homestead Project ”

“ Bulk Gas Generation and Storage Systems of the Mars Homestead Project ”. Damon Ellender MHP Programming Team DamonE@marshome.org. Design Goals.

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“ Bulk Gas Generation and Storage Systems of the Mars Homestead Project ”

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  1. “Bulk Gas Generation and Storage Systems of the Mars Homestead Project” Damon Ellender MHP Programming Team DamonE@marshome.org

  2. Design Goals • Design a Bulk Gas Plant and associated processes, located on Mars, to meet settlement and manufacturing needs for O2, H2, CH4, N2/Ar2 production and storage.

  3. Design Assumptions • Gas Composition as specified by NASA • Ready source of water available • Where possible, known and proven techologies are used • CH4 stored and used for fuel • Initial Storage vessels imported from Earth

  4. Process Assumptions • Electrolysis: • 2H20=> 2H2 + O2 • Sabatier Reactor: • 4H2 + CO2 => 2H2O + CH4 • Compression and Cooling: • Atmosphere => CO2 (l or s) + N2 (g) +Ar2 (g) • O2 Liquefaction and Storage: • CH4 Liquefaction and Storage: • N2/Ar Liquefaction and Storage:

  5. Process Details • Electrolysis: • 2H20=> 2H2 + O2 • Gibbs Free Energy: DG=-237.13 kJ/mol • 1 Bar , 298K • Sabatier Reactor: • 4H2 + CO2 => 2H2O + CH4 • Exothermic after startup • 1 Bar, 873K

  6. Electrolysis-Sabatier Process • Basic Electrolysis assumed • Hydrogen the limiting factor • All water from Sabatier Process recycled

  7. Gas Liquefaction and Storage

  8. CO2 Basic Separation • Compression chosen to 20 Bar to keep CO2 in liquid phase for piping and storage

  9. Compression and Cooling • Compress Mars Atmosphere from .07 to 20 Bar. Provides CO2 Liquid phase • Worst Case Specific Work(Isentropic): -421 kJ/kg • Best Case Specific Work(Isothermal): -199 kJ/kg • Isentropic Dt=~500K requires Inter-cooling: -747 kJ/kg • Additional Compression Cooling to liquefy Ar/N2 gas: -120 kJ/kg Inter- Cooling Specific Work (kJ/kg) DS=0 Dt=0 Bar (Differential)

  10. Storage Vessel Design • Storage for 4 Months full usage • Higher Pressures Selected to minimize imported pressure vessel mass Volume (m3)

  11. Storage Vessel Design • Spherical Vessels • Maximum Allowable Working Pressure (MAWP)= ~42 Bar • Composite Vessels are expected to reduce Titanium Mass by 1/2 Mass (tonne)

  12. Summary Power Matrix Phase One-(2 Years) Gas Production to Storage Assume full production to storage. Fill 1 Month Emergency Storage in 1 Year.

  13. Phase Two-(2 Years)All Gas Production to Manufacturing

  14. Import Staging Phase 1 Import Listing Weight and Size

  15. Import Staging Phase 2 Import Listing Weight and Size

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