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Biogas upgrading with the DMT-Carborex®-MS system
Utilizing green gas to its full potentialUsing high selective membranes
R. Lems M.Sc. , R&D Manager
DMT Environmental Technology
Why biogas upgrading?
Digester
Gas treatment(desulphurisation)
GasTreatment(upgrading)
Green gas(CBG:CompressedBioGas)
Mobility
Power 40%
Biogas
Heat 60%CHP
Naturalgas grid
Biogas as Vehicle Fuel
Substance %
Methane, CH4 45-75
Carbon dioxide, CO2 25-45
Carbon monoxide, CO 0-0,3
Nitrogen, N2 1-15
Water, H2O Saturated
Hydrogen sulfide, H2S 0,1-0,5
Oxygen, O2
Siloxane, R2SiOtraces
• PWS: Pressurized Water Scrubbing– Low investment and operational cost– Low methane slip 0.8 % (but still oxidizable)
– High energy efficiency >96%– Proven technology– Robust system– Flexible system– No chemicals
Choice for biogas upgrading?
Choice for biogas upgrading?
• MS: Membrane separation– Lowest investment and operational cost– Lowest methane slip <0,5%– Highest energy efficiency >98%– Highest operational up time– Plug & play configuration– Compact– Simple on/off– No chemicals and/ or water
Biogas CH4
CO2
Membrane separation
• Selectivity• Permeability• CH4 Recovery
DMT-HSMembranes
60
CH4recover
CH4 inoff gas
Recycle
Single stage S=20 69,9 25,8 - %Single stage S=50 87,1 13,1 - %
CH4recover
CH4 inoff gas
Recycle
Single stage S=20 69,9 25,8 - %Single stage S=50 87,1 13,1 - %Dual stage S=20 90,4 10,1 +35,3 %Dual stage S=50 96,1 4,3 +25,0 %
CH4recover
CH4 inoff gas
Recycle
Single stage S=20 69,9 25,8 - %Single stage S=50 87,1 13,1 - %Dual stage S=20 90,4 10,1 +35,3 %Dual stage S=50 96,1 4,3 +25,0 %Multi stage S=20* 95,2 5,1 +156,3 %Multi stage S=50 99,6 0,5 +33,7 %
*theoretical calculation
16
Recycle stream
30-35%OFF-gas
>98% CO2:
< 0,5% Methane
Product Biomethane
(> 97% Methan)
10 to 25 bar
ca. 53% Methan, 47% CO2
Compressor
10 to 25 bar DMT
Carborex®-MS
Activated CarbonH2S removal
Compressor5-10 bar
Desiccant dryerZeolites
Compressor 250 bar
Condensate trapCondensate trap
CO2 rich streamBiomethane
Storage buffer
Gasgrid
Chiller
Biogas
Electrical heater
Electrical heaterMembrane
Quality check
10-16 bar
Case1. 580 Nm3/hr, 54% CH4, 500ppm H2S2. 97% CH4 CBG, <0,5% CH4 emissions3. 12y at 7%, 0,07euro/kWh4. CBG for 0,73 euro Nm3
MS PWS PSAAvailability 98% 96% 94%Methane slip 0,5% 1% 3%
General literature values from users and suppliers. No guarantee values
MS PWS PSAInvestment (upgrading) 1.040.000 1.100.000 1.250.000 €Investment (constr.) 30.000 55.000
80.000€
Investment (off gas) - 250.000 250.000 €Total Investment 1.070.000 1.405.000 1.580.000 €
Depreciation (12y) 89.167 117.083 131.667 €
Interest (7%) 45.548 59.809 67.258 €/aPower (0,07 eur/kWh)
73.11183.555 85.153 €/a
Consumables (AC/MS) 57.000 22.50027.541
€/aMaintenance 23.300 25.000 28.500 €/aStaff 3.600 14.600
13.000€/a
Methane loss (slip) 11.130 21.69662.443
€/aMethane loss (availability) 45.427 90.398
132.857€/a
Total 348.283 434.641 548.419 €/a
Utilisation of Biogas
Utilisation of Biogas
Conclusions
Biogas upgrading with high selectivemembranes is the way to go.
– Lowest CAPEX and OPEX– Lowest methane slip <0,5%– Highest energy efficiency >98%– Highest operational up time
“Biogas upgrading withthe DMT-Carborex®-MS system”Utilizing green gas to the full potential
R. Lems M.Sc. , R&D Manager
DMT Environmental Technology
