ELECTRICITY, GAS, STEAM AND HOT WATER
SUPPLY # 2
Background
SNAM is a company in the ENI Group
responsible for the supply, transportation and large scale distribution of
natural gas. It has a gasline network of some 26,000 km, which supplies natural
gas to industries and gas distribution companies. The network is powered by
compressor stations throughout Italy which employ gas turbines that use natural
gas as a fuel and also produce air pollutants. The case study illustrates
application of new equipment for dry low-NOx technique, for pollution
prevention.
Cleaner Production
Principle
Process modification
Cleaner Production
Application
In two SNAM gas compressor stations,
conventional fixed geometry combustion chambers of two gas turbines were
replaced with dry low-NOx chambers with variable geometry combustion systems.
Air mass flow used for combustion is adjusted to the thermal load to control
flame temperature.
As the result of dry low-NOx technique
flame temperature and thermal NOx is decreased without injecting of steam or
water and without any flue gas treatment.
The dry low-NOx technique was provided by
Nuovo Pignone. It is a turbo machinery company owned by General Electric Co.
Their products include process compressors, pumps turbines, and valves and
control systems.
Environmental and Economic
Benefits
The project resulted in following
benefits,
NOx emissions are reduced from 200 ppmvd (corrected to 15%
O2) to 35
ppmvd. | Substantial reduction of CO emissions. |
Routine maintenance of the gas turbine is
not affected, so there are no extra-costs for servicing.
Constraints
No constraints reported
Contacts
- Mr Angelo Riva
- R&D Manager for Safety,
Environment and Natural Gas
- Utilization
- SNAM S.p.A
- Piazza Vanoni, 1
- I - 20097 San Donato
- Milan, Italy
- Tel : +39 (2) 520 7934; Fax : +39 (2)
520 38133
-
- Technology Supplier:
- Mr Luciano Bonciani
- Nuovo Pignone S.p.A.
- Via F. Matteucci, 2
- I - 50127 Florence
- Italy
- Tel : +39 (55) 4233518; Fax : +30 (55)
4232800
Review Status
This case study was submitted to UNEP IE
by ECOMED, Agency for Sustainable Development of the Mediterranean, Via di Porta
Lavernale, 26, 00153 Roma, Italy. It was reviewed by UNEP IE November, 1995.
Subsequently the case study has undergone a
technical review by Dr Prasad Modak at Environmental Management Centre, Mumbai,
India, in September 1998.
