Minimization of CO2 capture energy penalty in second generation oxy-fuel power plants

Escudero, Ana; Espatolero, Sergio; Romeo, Luis M.; Lara, Yolanda; Paufique, Cyrille; Lesort, Anne-Laure; Liszka, M.

doi:10.1016/j.applthermaleng.2016.04.116

Cited by 62 publications

(27 citation statements)

References 26 publications

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“…The biggest obstacle to the development and application of oxy-fuel technology at present is the net efficiency penalty associated with the high cost of the air separation unit (ASU) and compression purification unit (CPU). For a conventional air-fired coal power plant, the net efficiency reduced by more than 10% when it is converted to oxy-firing [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Duan

Anthony

et al. 2017

Fuel

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Pressurized oxy-fuel combustion (POFC) is a promising technology for CO2 capture from coal-fired power plants, offering both high efficiency and a low penalty. However, the high partial pressure of CO2 in a POFC furnace has important impacts on fuel-N and fuelS conversion during the coal pyrolysis process, and understanding this will help to achieve further control of SOx/NOx. In this study, coal pyrolysis experiments were conducted in a pressurized fluidized bed with the pressure range of 0.1-0.7MPa under N2 and CO2 atmosphere. The gaseous products were monitored by a Fourier transform infrared spectroscopy analyzer (FTIR) and the char residue was characterized by an X-ray photoelectron spectroscopy (XPS) analyzer in order to acquire the species information for S-containing and N-containing compounds. Results show that the enrichment of CO2 in the local atmosphere enhances the fuel-N conversion to HCN in the pyrolysis process, which serves as a favorable precursor to N2O. The generation of HCN and NH3 increase simultaneously with the increase of overall pressure. SO2 concentration in the gaseous product is relatively low, and as the pressure increases, the concentration decreases slightly due to CO reduction of SO2 to COS. Sulfur content in the char decreases as the pressure goes from 0.1MPa to 0.7MPa indicating higher CO2 pressure accelerates the decomposition of sulfur compounds in the coal, which is further confirmed by the XPS results.

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Section: Introductionmentioning

confidence: 99%

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Duan

Anthony

et al. 2017

Fuel

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“…Around the same penalty was obtained by Gao et al but they concluded that efficiency loss could be reduced by using optimized cryogenic ASU processes and a higher level of integration [22]. Later works, with integration and high oxygen concentration in the boiler and optimized ASU and CPU designs, reduce the penalty to 7.3 points [29] and to 7.26 points using the waste heat from ASU, CCS installation and flue gas in a lignite drying system [30]. In this case, the introduction of the drying installation has a major impact on the growth in efficiency of the oxy-fuel installation but is feasible only for high moisture fuels.…”

Section: Introductionmentioning

confidence: 52%

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

Espatolero

Romeo

Escudero

et al. 2017

International Journal of Greenhouse Gas Control

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Oxy-fuel combustion is one of the key alternatives for coal power production with near-zero CO 2 emissions. Technology has been successfully proved in demonstration facilities and the next step is to improve its efficiency to facilitate the application to future commercial installations. The use of pure oxygen reduces the total volume of flue gases and concentrates CO 2 at boiler outlet. Nevertheless, there is an important energy penalty and efficiency of the power plant substantially decreases around 10-12 efficiency points. Increasing the oxygen concentration in the boiler up to 40% is a recent proposal to raise boiler efficiency and it is also an interesting solution to overcome the energy penalties of the kind of CCS system. Air separation unit (ASU) and compression and purification unit (CPU) are the main processes that reduce the efficiency. Heat integration results mandatory in order to improve the overall power plant efficiency by reducing the energy penalty. Many solutions have tried to show outstanding efficiency results but practical proposals are necessary to develop the technology. The use of flue gases waste energy to recycle flue gases heating up, oxygen preheating and increasing temperature of feedwater to steam cycle has been proposed to surpass the efficiency reduction. Nevertheless, care should be taken as potential problems would appear if only theoretical analysis is carried out. This work deals with a suitable and flexible design to increase the overall efficiency of a second oxy-fuel combustion power plant working with high O 2 concentration. Waste energy has been integrated avoiding any potential risk/damage into a new designed steam cycle. Finally, results are compared with a previously optimized power plant design without operational restrictions and just a slight reduction in power plant net efficiency (less than 1%) was observed between both concepts.

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“…CO 2 compression and sorbent regeneration during CO 2 capture account for about 92% of the energy penalty associated with most carbon capture and storage technologies [113]. For instance, a typical CO 2 capture system that is based on monoethanolamine (MEA) requires a significant amount of energy at about 3.0-4.5 GJ/t CO 2 to regenerate the solvent in the stripper reboiler as well as energy for the stripper feed which is usually provided by cooling of the lean solvent [114]. According to a report by Zenz-House et al [115], energy penalty associated with retrofitting CO 2 capture devices into existing power plants is estimated between 50 and 80%.…”

Section: Energy Penalty In Co 2 Capture Systemsmentioning

confidence: 99%

A review on heat and mass integration techniques for energy and material minimization during CO2 capture

Yoro

Sekoai

Isafiade

et al. 2019

Int J Energy Environ Eng

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One major challenge confronting absorptive CO 2 capture is its high energy requirement, especially during stripping and sorbent regeneration. To proffer solution to this challenge, heat and mass integration which has been identified as a propitious method to minimize energy and material consumption in many industrial applications has been proposed for application during CO 2 capture. However, only a few review articles on this important field are available in open literature especially for carbon capture, storage and utilization studies. In this article, a review of recent progress on heat and mass integration for energy and material minimization during CO 2 capture which brings to light what has been accomplished till date and the future outlook from an industrial point of view is presented. The review elucidates the potential of heat and mass exchanger networks for energy and resource minimization in CO 2 capture tasks. Furthermore, recent developments in research on the use of heat and mass exchanger networks for energy and material minimization are highlighted. Finally, a critical assessment of the current status of research in this area is presented and future research topics are suggested. Information provided in this review could be beneficial to researchers and stakeholders working in the field of energy exploration and exploitation, environmental engineering and resource utilization processes as well as those doing a process synthesis-inclined research.

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Minimization of CO2 capture energy penalty in second generation oxy-fuel power plants

Cited by 62 publications

References 26 publications

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

An operational approach for the designing of an energy integrated oxy-fuel CFB power plant

A review on heat and mass integration techniques for energy and material minimization during CO2 capture

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