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Process simulation and plant layout of a combined cycle gas turbine for offshore oil and gas installations

100%

Bimüller J. D. , Nord L. O.

2015

tom Vol. 95, nr 1

40--47

Since the development of the first oil fields on the Norwegian Continental Shelf, the petroleum industry in Norway has been making continuous progress in oil production engineering. With greater environmental awareness and increasing taxation of NOx and CO2 emissions, the economic pressure has been rising in recent decades. The energy demand for o shore oil and gas production is high. With a view to improving power generation on offshore oil and gas installations, four models of dierent power cycles were investigated: a simple cycle gas turbine (currently the default option), a compact combined cycle with enhanced fuel utilization, a steam injection gas turbine cycle as an innovative solution, and a state of the art combined cycle for onshore applications as a reference cycle. Special requirements for o shore installations are discussed and sizing was identified as the major criterion. The power demand of an oil platform and its change during dierent states in field life were analyzed. To complete the simulations, the models were set to off-design conditions and the part-load behavior was investigated. The plant layouts were laid out and visualized with 3D CAD models.

Combined heat and power plant on offshore oil and gas installations

80%

Følgesvold E. , Skjefstad H. S. , Riboldi L. , Nord L. O.

Journal of Power Technologies

2017

tom Vol. 97, nr 2

117--126

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.