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

Rlems@dmt-et.nl

Why biogas upgrading?

Digester

Gas treatment(desulphurisation)

GasTreatment(upgrading)

Green gas(CBG: Compressed BioGas)

Mobility

Power 40%

Biogas

Heat 60%

CHP

Natural gas grid

• PWS: Pressurized Water Scrubbing– Low investment and operational cost– Low methane slip 0.8 % – High energy efficiency >96%– Proven technology– Robust system– Flexible system– No chemicals

Choice for biogas upgrading?Large Scale >500Nm3/hr

Choice for biogas upgrading?Small scale <750Nm3/hr

• 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

Availability and OPEX

Biogas CH4

CO2

Membrane separation

Membrane life time

100/100

40/25% slip

60/98

50/510% slip

10/93

Multi stage

Biogas:

CH4 (53,3%)CO2 (46%)H2O (0,1%)N2 (0,5%)O2 (0,1%)

Mixer

Membrane Cascade for upgrading

BiomethaneCH4 > 97%

OFF Gas< 0.5% CH4

Recycle Stream

0,0%

20,0%

40,0%

60,0%

80,0%

100,0%

120,0%

140,0%

160,0%

180,0%

200,0%

10 20 30 40 50 60 70

Membrane selectivity CO2/CH4

Re

cy

lce

Str

ea

m %

Competing membranes

High Selective

membranes

10-16 bar

Utilisation of Biogas

Utilisation of Biogas

Conclusions

Biogas upgrading with high selective membranes is the way to go.

– Lowest CAPEX and OPEX– Lowest methane slip <0,2% – Highest energy efficiency >98%– Highest operational up time

- 0-100% flow flexibility

“Biogas upgrading with

the DMT-Carborex®-MS system”

Utilizing green gas to the full potential

R. Lems M.Sc. , R&D Manager

DMT Environmental Technology

Rlems@dmt-et.nl

Electric and thermal power consumption

Case1. 580 Nm3/hr, 54% CH4, 500ppm H2S

2. 97% CH4 CBG, <0,5% CH4 emissions

3. 12y at 7%, 0,07euro/kWh

4. CBG for 0,73 euro Nm3

MS PWS PSA

Availability 98% 96% 94%

Methane slip 0,5% 1% 3%

General literature values from users and suppliers. No guarantee values

MS PWS PSA

Investment (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 €/a

Power (0,07 eur/kWh) 73.111

83.555

85.153 €/a

Consumables (AC/MS) 57.000 22.500

27.541

€/a

Maintenance 23.300 25.000

28.500 €/a

Staff 3.600 14.600

13.000

€/a

Methane loss (slip) 11.130 21.696

62.443

€/a

Methane loss (availability) 45.427 90.398

132.857

€/a

Total 348.283 434.641 548.419 €/a

• Selectivity: How good is the separation

• Permeability: How fast is the separation

• CH4 Recovery: How much do you lose

DMT-HS Membranes

60