Modelling and simulation of CO2 (carbon dioxide) bottoming cycles for offshore oil and gas installations at design and off-design conditions

Abstract

Keywords:Offshore Bottoming cycle CO 2 power cycle Off-design Modelling and simulation a b s t r a c t Improved energy efficiency is an issue of increasing importance in offshore oil and gas installations. The power on offshore installations is generated by gas turbines operating in a simple cycle. There is an obvious possibility for heat recovery for further power generation from the exhaust heat. However, the limited space and weight available makes the inclusion of bottoming cycles challenging. Due to its high working pressure and thereby compact components CO 2 (carbon dioxide) could be a viable solution, combining compactness and efficiency. An in-house simulation tool is used to evaluate the performance of CO 2 bottoming cycles at design and off-design conditions. Both a simple recuperated single stage cycle and a more advanced dual stage system are modelled. Results from simulations show a potential for 10 e11%-points increase in net plant efficiency at 100% gas turbine load. Also off-design simulations taking the variation in heat exchanger performance into account are performed showing that the bottoming cycle improves the off-design performance compared to the standard gas turbine solution. Even at 60% GT (gas turbine) load, the combined cycle with CO 2 bottoming cycle can achieve up to 45% net plant efficiency, compared to 31% for only the gas turbine.

Streamlining Digital Modeling and Building Information Modelling (BIM) Uses for the Oil and Gas Projects

“…A 3D model can also be simulated with process analysis software to address engineering challenges such as the X (Pathak et al, 2013); (Walnum et al, 2013); (Kvesic et al 2012) (Aveva, 2015; (Intergraph, 2014); (Intergraph, 2015a); (Aspentech, 2015a) Analyse 21 multiphase flow modeling, gas processing, refining and LNG process (Aveva 2015, p.34-37).…”

Novel Energy Efficiency Technologies for Reduction of Offshore COEmissions

“…Transcritical CO 2 cycles, Organic Rankine Cycles and steam power cycles (6)(7)(8)(10)(11)(12). Also an estimate is made of heat exchanger size and weight.…”

“…In other words -to recover the energy now lost (5)(6)(7)(8). In the EFFORT project, funded by some of the major oil and gas companies and the Research Council of Norway's PETROMAKS programme, the potential for using the waste heat to generate additional electricity, using an additional turbine "hooked up" to the power plant, is investigated.…”

Development and validation of a full-range performance analysis model for a three-spool gas turbine with turbine cooling

“…The thermodynamic modeling and performance calculation of a gas turbine is necessary for both its design and its operation; not only the design condition but also the off-design (or part-load) condition should be of concern. Moreover, the research and evaluation of novel gas-turbine-based systems (such as a solid oxide fuel cell/gas turbine hybrid system [1], a solar hybrid combined cycle system [2], the combined cycle with Carbon Dioxide bottoming cycle [3], and the combined cooling, heating and power systems [4]) also require an accurate and reliable method to predict the full-range performance of gas turbines.…”