Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes

Fu, Chao; Gundersen, Truls

doi:10.1016/j.energy.2012.01.065

Cited by 141 publications

(63 citation statements)

References 15 publications

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“…It may further translate to thermodynamic benefits achieved in energy conversion cycles integrated with CO 2 capture. Solid sorbents seem more suitable for pre-combustion and chemical looping applications while cryogenic capture cannot be efficiently integrated into thermal power plants [5]. Moreover, solid sorbents have limited regenerability and often degrade after a few cycles.…”

Section: Introductionmentioning

confidence: 99%

Useful Mechanisms, Energy Efficiency Benefits, and Challenges of Emerging Innovative Advanced Solvent Based Capture Processes

Budzianowski¹

2016

Green Energy and Technology

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Innovative advanced solvent based capture processes (ASBCPs) employing sophisticated separation mechanisms have emerged as essential solutions that may dramatically reduce high energy requirement of CO 2 separation in capture plants. This study systematically characterises useful mechanisms of several such ASBCPs, being mostly at relatively low technology readiness levels. Based on improved understanding of these emerging ASBCPs it is shown how they can contribute to achieving energy efficiency benefits and thus increase CO 2 capture efficiency. It is followed by an analysis of practical examples of all ASBCPs recently presented in academic and patent literature. Finally, major challenges of discussed emerging ASBCPs are identified showing potential directions for further research and development. Overall, innovative ASBCPs employ very different mechanisms translating to different energy efficiency benefits in various CO 2 capture applications. The provided technological account along with the identified challenges may be useful for capture process developers which will be able to bring the most promising ASBCPs to higher technology readiness levels and finally they can be employed in the practice. Nomenclature 5OCB4,4′-pentyloxy cyanobiphenyl 7OCB 4,4′-heptyloxy cyanobiphenyl AA Aqueous ammonia AAS Amino acid salt ASBCP Advanced solvent based capture process BDA 1,4-butanediamine BTCA Benzotriazole-5-carboxylic acid

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Section: Introductionmentioning

confidence: 99%

Useful Mechanisms, Energy Efficiency Benefits, and Challenges of Emerging Innovative Advanced Solvent Based Capture Processes

Budzianowski¹

2016

Green Energy and Technology

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“…The inefficiency of the smaller ASU units reduces the performance of this system design for small DG units. A 10 ton per day system could support a 1 MW plant with as little as 20% parasitic load on the electrical output, while the parasitic load dips below 10% as the Oxy-FC plant approaches 100 MW, using ASU system performance noted in the literature [28,29] and manufacturer brochures. The HSU parasitic load is determined from the additional electric power needed to liquefy a portion of the nitrogen in the ASU.…”

Section: à2mentioning

confidence: 99%

Poly-generating closed cathode fuel cell with carbon capture

McLarty¹,

Brouwer²

2014

Applied Energy

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“…The current model includes the energy requirement of air separation (as if it was accomplished on-site), but not that of transportation and delivery, when calculating the system performance characteristics and efficiency. The production of high purity oxygen is assumed to require 0.21 kWh kg O2 À1 [22], which can be expressed also as 0.756 kW (g O2 À1 )…”

Section: Co 2 Separation Processmentioning

confidence: 99%

“…À1 [22]. The voltage characteristics of the MCFC were calibrated according to the fuel cell performance characteristics presented in Ref.…”

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confidence: 99%

Study of CO 2 recovery in a carbonate fuel cell tri-generation plant

Rinaldi

McLarty

Brouwer

et al. 2015

Journal of Power Sources

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h i g h l i g h t sSeparation of CO 2 in a biogas plant that co-produces electricity, hydrogen, and heat. The ability of MCFC is to concentrate CO 2 in the anode exhaust stream. Three cathode inlet configurations are considered. Results illustrate a high compatibility between hydrogen co-production and CO 2 recovery. A series configuration of MCFC technology coupled with an ICE achieves outstanding carbon recovery (exceeding 90%). a r t i c l e i n f o b s t r a c tThe possibility of separating and recovering CO 2 in a biogas plant that co-produces electricity, hydrogen, and heat is investigated. Exploiting the ability of a molten carbonate fuel cell (MCFC) to concentrate CO 2 in the anode exhaust stream reduces the energy consumption and complexity of CO 2 separation techniques that would otherwise be required to remove dilute CO 2 from combustion exhaust streams. Three potential CO 2 concentrating configurations are numerically simulated to evaluate potential CO 2 recovery rates: 1) anode oxidation and partial CO 2 recirculation, 2) integration with exhaust from an internal combustion engine, and 3) series connection of molten carbonate cathodes initially fed with internal combustion engine (ICE) exhaust. Physical models have been calibrated with data acquired from an operating MCFC tri-generating plant. Results illustrate a high compatibility between hydrogen coproduction and CO 2 recovery with series connection of molten carbonate systems offering the best results for efficient CO 2 recovery. In this case the carbon capture ratio (CCR) exceeds 73% for two systems in series and 90% for 3 MCFC in series. This remarkably high carbon recovery is possible with 1.4 MWe delivered by the ICE system and 0.9 MWe and about 350 kg day À1 of H 2 delivered by the three MCFC.

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Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes

Cited by 141 publications

References 15 publications

Useful Mechanisms, Energy Efficiency Benefits, and Challenges of Emerging Innovative Advanced Solvent Based Capture Processes

Useful Mechanisms, Energy Efficiency Benefits, and Challenges of Emerging Innovative Advanced Solvent Based Capture Processes

Poly-generating closed cathode fuel cell with carbon capture

Study of CO 2 recovery in a carbonate fuel cell tri-generation plant

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