“Making pressurized water scrubbing

the ultimate biogas upgrading technology

with the DMT TS-PWS® system”

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

DMT Environmental Technology

Why biogas upgrading?

Digester

Gas treatment(desulphurisation)

GasTreatment(upgrading)

Green gas(CBG: Compressed BioGas)

Mobility

Power 40%

Biogas

Heat 60%

CHP

Natural gas 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

Why upgrading Biogas?

Choice for large-scale?

• PSA: Pressure Swing Absorption- complex/ high operational costs+ N2 removal

• CA: Catalytic absorption- chemicals and heat needed+ very low methane slip (if no CHP is used for heat)

• MS: Membrane Separation- High methane loss (10-20%)+ simple system

• CL: Cryogenic liquefaction.- complex/ expensive/ no proven technology/ low energy efficiency+ liquid CO2

• PWS: Pressurized Water Scrubbing- high towers+ No chemicals, simple system, high energy efficiency

Choice for Full-scale?

ISET 09-09-2009

Choice for Full-scale?

ISET 09-09-2009

Choice for Full-scale?

• PWS: Pressurized Water Scrubbing– High energy efficiency– Low operational cost– Low methane slip (but still oxidisable)– Robust system– Most flexible system– No chemicals

Flash vessel

Pump

CompressorH2S removal

Absorber

Stripper

Air blower

Dryer

Snelkoppeling naar proces technologie op 'Dirkse01' (R).lnk

Chiller

4 Innovative improvements

• Sterilization biogas at compressor (160ºC)

• UV disinfection circulation water

• Dehydration Dryer unit

• Hepa filter Last defence

Bacteria barriers.

Bacteria defense system

DMT-TS-PWS®

H2S + O2 =>

H2SO4

T=30C

pH= 0.5-1.5

Biological desulphurization

DMT-TS-PWS®

No Chemical use!

power

Power

15kWe

cooling

52.5 kWq

Heat 67.5 kWq

Heat Pump technology

Chiller

DMT-TS-PWS®

Heat pump

CO2 RecoveryDMT-TS-PWS®

-25 to -30C and 12-15 bar

Food grade:>99.99% pure

•Quadruple integrated Bacterial barrier.

•Desulphurization without chemical consumption

• >100% energy efficiency

•Eliminating CO2 emmisions

“Making pressurized water scrubbing

the ultimate biogas upgrading technology

Plant Examples

Utilisation of Biogas

“Making pressurized water scrubbing

the ultimate biogas upgrading technology

with the DMT TS-PWS® system” R. Lems M.Sc. , R&D Manager

DMT Environmental Technology: RLems@dmt-et.nl

PSA MS CL CA PWS TS-PWS® unit Energy consumption 0.22-0.25 0.5 0.3-0.4 0.3-0.4 0.2-0.3 0.26 kWh/m3 upgraded Energy ef ficiency 96-97 80-85 91-92 91-92 95-96 >100 % Methane slip 1-3 10-20 0.5-0.8 0.1-0.2 0.6-0.8 <0.001 % Upgraded gas quality 98 90-95 98 99 98 98 % CH4 CO2 recovery No No GH No GH FG No, GH, FG Chemical use AC/MS Water/SH/AC AC Cat/water/AC Water/ S Water/ S Ease of operation + +/- + /- + ++ ++ -, +/-, + , ++ Flexibilit y - +/- + /- + ++ ++ -, +/-, + , ++ References + - - + ++ ++ -, +/-, + , ++ Operational cost 0.26 0.3-0.5 0.4 0.35 0.25 0.18 Euro/m3 upgraded Investment costs 1.3-1.4 >1.5 1.4-1.5 1.1-1.3 0.8 1.2-1.3 Milj. euro

550Nm3/hr biogas 65% CH4

Direct catalytic regenerative oxidation

99.9% removal of CH4 + H2S

Heat recovery from the CH4

CH4 emision controlDMT-TS-PWS®

Plant examplesPicture 6