Investigation of offshore thermal power plant with carbon capture as an alternative to carbon dioxide transport

Windén, B.; Chen, Mingsheng; Okamoto, Naoya; Kim, Do Kyun; McCaig, Elizabeth; Shenoi, Ajit; Wilson, P.A.

doi:10.1016/j.oceaneng.2013.07.016

Cited by 20 publications

(4 citation statements)

References 5 publications

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“…These noise sources are usually unavoidable [15,16,17] and may affect the acoustic operations as well as the biological environment [18,19,20]. Vessel noise varies greatly from vessel to vessel [21], while research vessel itself is usually the noise source for underwater acoustic research, e.g., marine carbon capture and storage [22,23,24]. Here we investigate the ensemble of seafloor noise in the presence of a research vessel transiting within <10 km associated with natural environment characteristics.…”

Section: Introductionmentioning

confidence: 99%

Seafloor noise ensemble from vessel manoeuvre in the central North Sea

White

Roche

2020

Ocean Engineering

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Anthropogenic noise, e.g., shipping noise, are usually unavoidable and radiate over a certain area, e.g., 10 km depending on the noise source level and acoustic propagation channel, which might affect seabed acoustic engineering as well as species' communication, behaviour, fitness and consequently their survival. Therefore, better understanding of these noise sources allows better prediction of performance of seafloor acoustic research, engineering, and biological environment. Measurements from a hydrophone system mounted on the seafloor in the central North Sea permit comparisons between temporal and spectral seafloor noise as a vessel transits nearby. The measured data indicates that the peak energy in the power spectral density (PSD) of seafloor noise is dominated by that of multiple vessel tonal noise. The tidal level has a strong negative correlation with the seafloor noise variance, and the vessel to hydrophone angle has a modest negative correlation with both the noise variance and kurtosis, particularly within a certain distance (6.6 km at depth 150 m here). As the vessel approaches, the seafloor noise is sensitive to the noise radiated from the vessel manoeuvre dominated at frequencies 400-900 Hz. Further, as the vessel speed increases from 2 knots to 15 knots, the vessel tonal increases the PSD by 10-20 dB at multiple narrow frequency bands (770 and 850 Hz). Results reported here advance the knowledge of seafloor acoustic sensitivity to nearby transit vessels.

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Section: Introductionmentioning

confidence: 99%

Seafloor noise ensemble from vessel manoeuvre in the central North Sea

White

Roche

2020

Ocean Engineering

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“…In the past decades, the increasing level of greenhouse gas, including carbon dioxide (CO 2 ) [1], has resulted in global climate change manifest by the melting of sea ice [2], the rise of sea level, and the disappearance of wetlands [3]. For mitigating climate change caused by anthropogenic emissions of green-house gases, sub-seabed storage of CO 2 in Carbon Capture and Storage (CCS) facilities has been discussed as one of a range of technologies that could be used [4,5,6,7]. A key issue with CCS is ensuring that sequestered gas remains in the sub-surface, and that any significant leakage is detectable.…”

Section: Introductionmentioning

confidence: 99%

A noise impact assessment model for passive acoustic measurements of seabed gas fluxes

White

Bull

et al. 2019

Ocean Engineering

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Accurate determination of seabed gas flux is important for understanding natural processes as well as giving confidence that the size of any leaks from marine infrastructure can be properly assessed. Acoustic methods for flux determination require a relatively quiet underwater environment, and can fail when there is too much noise from other natural or anthropogenic sources. This study applies an acoustic monitoring example of seabed gas leakage in terms of sound level intensity, to statistically assess and minimize the impact from oceanic noise on seabed acoustic experiments which require relative quiet environment. It addresses the question: how far from a source of radiated ambient noise does a recording hydrophone and location of seabed gas need to be so that acoustic methods for remotely determining gas flux are successful. We develop a model to assess impacts of ambient noise under various conditions, incorporating sound/noise sources (seabed gas leaks, sea surface agitation and shipping) and underwater acoustic propagation. The reliability of the model is tested by comparing measured seabed ambient noise in the central North Sea, and the robustness of it is verified by presenting statistical outliers and a receiver operating characteristic (ROC) curve. A range of scenarios are presented for several gas flow rates, which show the threshold of detection when the recording hydrophone is at different distances from the location of seabed gas escape, and competing noise sources (including shipping and surface waves).

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“…A literature review indicates that most studies regarding offshore power generation in oil platforms relate to already operating or built facilities, restricting the options to improve the plant performance. There are only a few studies concerning offshore power generation hubs based on associated gas extraction, and these are limited to the use of fixed commercial equipment sets [10,15]. Moreover, in previous works, gas turbines in CC optimizations for off-shore applications were generally considered as "black boxes".…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of power hubs for Brazilian off-shore oil production units

Vidoza

Andreasen

Haglind³

et al. 2019

Energy

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A worldwide trend to reduce greenhouse gases emissions has encouraged researchers to study more efficient solutions in oil and gas Industry. Most offshore units are energized by equipment operating at low loads, increasing environmental impact. This work aims identifying optimal designs and layouts of a combined cycle floating power hub tailored for offshore oil production applications. The Brazilian pre-salt basin which forecast high fuel gas production is taken as a case study. A model was developed, integrating the design of the gas turbine, heat recovery units, steam turbine and condenser. Genetic algorithms were applied in two optimization approaches, single-objective and multi-objective. Three parameters were evaluated: equipment purchase cost, thermal efficiency and total weight. The results of the multi-objective optimization indicated that dual-pressure arrangements, featuring 3 gas turbines, 1 heat recovery steam generator and 1 steam cycle, could be an attractive design solution for power hubs. This arrangement has a low cost and weight, while the thermal efficiency is maintained at a reasonably high level (around 53.2 %). Moreover, results indicated that CO2 emissions may be reduced by 18.7 % to 27.2 % at design point and 19% for the power hub lifetime, when compared with the conventional energy supply scenario.

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Investigation of offshore thermal power plant with carbon capture as an alternative to carbon dioxide transport

Cited by 20 publications

References 5 publications

Seafloor noise ensemble from vessel manoeuvre in the central North Sea

Seafloor noise ensemble from vessel manoeuvre in the central North Sea

A noise impact assessment model for passive acoustic measurements of seabed gas fluxes

Design and optimization of power hubs for Brazilian off-shore oil production units

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