Combined heat and power plant on offshore oil and gas installations

Eirik R. Følgesvold, Håvard S. Skjefstad, Luca Riboldi, Lars O. Nord


Implementation of energy efficient technologies is an issue of growing importance for the offshore oil and gas industry. Rising
awareness of increasing levels of CO2in the atmosphere is a major driver in this move, with a main aim being to reduce the
amount of released CO2 per unit of oil or natural gas produced. Subsequently, the addition of steam bottoming cycles to
exploit exhaust heat from gas turbines offshore has become an attractive alternative. This paper will investigate two different
combined cycle configurations, namely the extraction steam turbine- and the backpressure steam turbine-cycle. Both cycles
were modelled using the process simulation software Ebsilon Professional with a single GE LM2500+G4 gas turbine as a
topping cycle, and a once-through heat recovery steam generator to exploit GT exhaust heat.At design, the steam turbines
produced 8.2 MW and 6.0 MW respectively, achieving net thermal efficiency of 45.5%/42.1%. This was a 12.3 pp/8.9 pp
increase compared to the simple cycle GE LM2500+G4 configuration.
The findings suggest that a backpressure steam turbine could be an attractive option for oil producing facilities with high
demand for process heat, while an extraction steam turbine configuration is more suited to gas producing facilities with lower
heat requirements and a higher demand for power and flexibility. Additionally, both cycles displayed a substantial reduction in
emitted CO2 per MWh produced, with reductions 26% and 21% compared to the simple cycle configuration achieved for the
extraction and backpressure cycle respectively.


combined cycle; process simulation; heat recovery; compact steam cycle; cogeneration; off-design; extraction steam turbine; back-pressure steam turbine

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