pictures: © dvgw – roland horn, fraunhofer ikts m teg comparable lower operating costs (~ 30%)...
TRANSCRIPT
Innovative membrane process
Increase energy efficiency
Increase system availability and flexibility
– Faster start-up time
– No stand-by operation necessary
Reduction of CO2 emissions
Lower energy consumption
Avoiding exhaust gases
– No gaseous emissions!
– No exhaust gas combustion unit (flash gas is recycled)
Reduction of thermal load on the TEG
Open the door to more applications of membranes in the gas sector
Project partners
pict
ures
: © D
VGW
– R
olan
d Ho
rn, F
raun
hofe
r IKT
S
Pilotplant connected to an existing plant on an underground gas storage
Drying of natural gas with an absorption / membrane
hybrid process
www.dbi-gruppe.com
LocationDBI Gas- und Umwelttechnik GmbH Karl-Heine-Straße 109/111 04229 Leipzig, Germany
Contact
Dipl. Chem. Udo Lubenau Head of department gas chemistry/gas treatment Phone: (+49) 341 2457-160 Fax: (+49) 341 2457-136 Email: [email protected]
glycol water
MemTEG
retri
eved
Jun
e 20
18
Comparable lower operating costs (~ 30%) than conventional plants
Low grade of TEG aging
Energy consumption around 40 kW per h (120 °C TEG regene-ration temperature)
Permeate flux obtained = 0.2 kg/(m²h) (0.5 – 1.5 wt-% H2O in TEG)
TEG content in permeate ≤ 10 g/l
Next steps
Operation in one more winter period – long-term stability?
Improvement potentials based on pilot plant operation are identified!
– Energy efficiency
– Membrane quality and performance
– System control and general set up
Scaling-up of membrane geometry
High levels of emission!
TEG regeneration by distillation (190 – 205 °C)
– TEG aging (cracking above 140 °C)
– High amount of energy is required
Exhaust gas containing hydrocarbons is released
– Need of an exhaust gas combustion unit (additional burning gas)
In case of temporarily no withdrawal:
– TEG cycle needs to be kept constantly running with the TEG preheated > 120 °C (standby modus) or long system start-up time
Built in 2016, commissioning in 2016/2017, regular operation 2017, 2018 …
Data sheet
Four containers (one 40 ft, three 20 ft), One adsorber unit (mobile plant)
Membrane unit installed in 40 ft container
20 m² installed membrane surface area (225 four-channel membranes)
Fully automated, system control by on-line measuring of the water content in the TEG
2 m³ overall TEG volume
TEG flow 150 – 300 kg/h
2.000 – 10.000 m³/h gas treatment capacity (pmax = 100 bar(g))
Working range = 0.5 – 1.5 wt-% (water content in TEG) (higher water content leads to higher permeablility, tested up to 30 wt-% water content)
Maximum water content in dry natural gas = 50 mg/m³ (according to DVGW G260)
Current results Parallel operation to the existing plant (including downtime)
Total amount of dried natural gas in winter period 2017/2018 was 8.000.000 m³
Separated amount of water 4.0 t
Pilot plant for natural gas drying State of the art
4 channel, 0.08 m² 7 channel, 0.10 m² 19 channel, 0.25 m²
Schema: state of the art natural gas dehydration and TEG regeneration