AcrionAcrion
Technologies
Processing 101: Gas Cleanup
Biogas to RNG Vehicle Fuelg
Jeff Cook
i @ iacrion@acrion.com
AcrionAcrion
Technologies
BioGas CompositionBioGas Composition
Digester and LFG
Methane (CH4) 45%- 65%
Carbon Dioxide(CO2)...
AcrionAcrion
Technologies
These Aren’t Bank Deposits
AcrionAcrion
Technologies
CNG (gas @3600psi)
CARB
CNG
Pipeline Engine
Mf.
CH4 88% min # 65
CO2 1-2%CO2 1 2%
Inerts,
(N2,CO...
AcrionAcrion
Technologies
LNG or LBM
Stored at BP of -260°F (-162°C)
Density 3 5 lb/galDensity 3.5 lb/gal
CO2 50 ppm
Water...
AcrionAcrion
TechnologiesLandfill LNG (-259°F)
AcrionAcrion
Technologies
Landfill Snow (d i 109°F)Landfill Snow (dry ice, -109°F)
AcrionAcrion
Technologies
AcrionAcrion
Technologies
CO2 and VOC Removal Processes
• Condensation + Freezing of CO2
Membranes (CO2)• Membranes (CO2)
...
AcrionAcrion
Technologies CO2 Wash® Process
( ’ )
Refrigeration
CH4, CO2 (no VOC’s)
Refrigeration
Liquid CO2
(no VOC’s)(no...
AcrionAcrion
Technologies
Membranes
Fast > Slow
H2>H2O>CO2>H2S>O2>N2 CH4H2>H2O>CO2>H2S>O2>N2,CH4
• Cellulose Acetate CO2/C...
AcrionAcrion
Technologies
AcrionAcrion
Technologies
Solvent Absorption
• PHYSICAL
Regeneration by Pressure Reduction,Regeneration by Pressure Reduct...
AcrionAcrion
Technologies
Properties of Physical Solvents
Water Selexol MeOH
CO2 Solubility 0 56 3 63 13 5CO2 Solubility 0...
AcrionAcrion
Technologies
AcrionAcrion
Technologies
Solid Adsorption
• PSA (Pressure Swing)
Cycle time: 10’s of sec to 10’s ofCycle time: 10’s of se...
AcrionAcrion
Technologies
AcrionAcrion
Technologies
Nitrogen Removal
• Address at Source ( e.g. Landfill)
PSA (N2 selective adsorbent)• PSA (N2 sele...
AcrionAcrion
Technologies
Conclusion
• All of the processes have been used
to produce RNG from biogasto produce RNG from b...
AcrionAcrion
Technologies
LNG Fueling StationLNG Fueling Station
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Acrion Technologies - RNG Gas Cleanup

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Discusses cleaning up renewable natural gas from multiple sources to enable use for electricity production and transportation fuel use.

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Acrion Technologies - RNG Gas Cleanup

  1. 1. AcrionAcrion Technologies Processing 101: Gas Cleanup Biogas to RNG Vehicle Fuelg Jeff Cook i @ iacrion@acrion.com
  2. 2. AcrionAcrion Technologies BioGas CompositionBioGas Composition Digester and LFG Methane (CH4) 45%- 65% Carbon Dioxide(CO2) 30% -45%Carbon Dioxide(CO2) 30% 45% Nitrogen (N2) 0% - 20% Oxygen (O2) 0% - 2%Oxygen (O2) 0% 2% Hydrogen Sulfide (H2S) from ppm’s to %’s VOC’s (Si Cl F S) 100’s of ppm’sVOC s (Si,Cl,F,S) 100 s of ppm s Water Saturated (2% to 6%)
  3. 3. AcrionAcrion Technologies These Aren’t Bank Deposits
  4. 4. AcrionAcrion Technologies CNG (gas @3600psi) CARB CNG Pipeline Engine Mf. CH4 88% min # 65 CO2 1-2%CO2 1 2% Inerts, (N2,CO2) 1.5-4.5% 4% 16,100 BTU/lb LHV(N2,CO2) BTU/lb LHV H2S 16 ppm 4 ppm H2O Amb-10F 7 lb/MMscfO b 0 dew pt
  5. 5. AcrionAcrion Technologies LNG or LBM Stored at BP of -260°F (-162°C) Density 3 5 lb/galDensity 3.5 lb/gal CO2 50 ppm Water 1 ppm Nitrogen 1%Nitrogen 1%
  6. 6. AcrionAcrion TechnologiesLandfill LNG (-259°F)
  7. 7. AcrionAcrion Technologies Landfill Snow (d i 109°F)Landfill Snow (dry ice, -109°F)
  8. 8. AcrionAcrion Technologies
  9. 9. AcrionAcrion Technologies CO2 and VOC Removal Processes • Condensation + Freezing of CO2 Membranes (CO2)• Membranes (CO2) • Physical Absorption • Chemical Absorption • Pressure Swing Absorption (PSA)• Pressure Swing Absorption (PSA) • Thermal Swing Absorption (TSA)
  10. 10. AcrionAcrion Technologies CO2 Wash® Process ( ’ ) Refrigeration CH4, CO2 (no VOC’s) Refrigeration Liquid CO2 (no VOC’s)(no VOC s) Dry, Compressed Landfill Gas with VOC’swith VOC s Liquid CO2 and VOC’s
  11. 11. AcrionAcrion Technologies Membranes Fast > Slow H2>H2O>CO2>H2S>O2>N2 CH4H2>H2O>CO2>H2S>O2>N2,CH4 • Cellulose Acetate CO2/CH4=10 Spiral Wound Sheets • Polyimide CO2/CH4=20• Polyimide CO2/CH4=20 Hollow Fiber,
  12. 12. AcrionAcrion Technologies
  13. 13. AcrionAcrion Technologies Solvent Absorption • PHYSICAL Regeneration by Pressure Reduction,Regeneration by Pressure Reduction, Vacuum and Stripping Gas Water, Selexol, Methanol, , • CHEMICAL Regeneration by Heating + Pressureg y g Reduction Amines (MEA) Fouled by Oxygen and LFG Contaminants
  14. 14. AcrionAcrion Technologies Properties of Physical Solvents Water Selexol MeOH CO2 Solubility 0 56 3 63 13 5CO2 Solubility 0.56 3.63 13.5 V/V @T(C) 25 25 -25 CO2 CH4 14 3 15 2 19 6CO2:CH4 14.3 15.2 19.6 BP C 100 275 65 Sp Gr 1.0 1.03 0.79
  15. 15. AcrionAcrion Technologies
  16. 16. AcrionAcrion Technologies Solid Adsorption • PSA (Pressure Swing) Cycle time: 10’s of sec to 10’s ofCycle time: 10’s of sec. to 10’s of min. Vacuum Regeneration • TSA (Thermal Swing)TSA (Thermal Swing) Cycle time: hours High temperature Regeneration
  17. 17. AcrionAcrion Technologies
  18. 18. AcrionAcrion Technologies Nitrogen Removal • Address at Source ( e.g. Landfill) PSA (N2 selective adsorbent)• PSA (N2 selective adsorbent) • Cryogenic
  19. 19. AcrionAcrion Technologies Conclusion • All of the processes have been used to produce RNG from biogasto produce RNG from biogas • RNG Vehicle Fuel: high value product • Smaller Scale than Pipeline Projects
  20. 20. AcrionAcrion Technologies LNG Fueling StationLNG Fueling Station

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