High-efficiency low LCOE combined cycles for sour gas oxy-combustion with CO2 capture

Chakroun, Nadim W.; Ghoniem, Ahmed F.

doi:10.1016/j.ijggc.2015.06.025

Cited by 24 publications

(10 citation statements)

References 20 publications

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“…Simple cooling of these combustion products would condensate the water vapor leaving highly CO 2 concentrated mixture that is easy to be separated for CO 2 capture . Fuel burning in an environment of pure oxygen resulted in significant increase in the combustion temperature . This necessitates the recirculation of great portion of the exhaust gases (mainly CO 2 plus H 2 O) to the combustion chamber and, based on that, a recirculation system is required.…”

Section: Oxy‐fuel Combustion In Conventional Combustion Systemsmentioning

confidence: 99%

“…Increasing the shale gas production along with the application of reducing CO 2 ‐emissions policies would make this trend continue in future. Chakroun and Ghoniem conducted a study on high efficiency low levelized cost of electricity combined cycles utilizing sour gas for oxycombustion with capture of CO 2 while using CO 2 as a diluent. Their study showed a better technical and economic performance of the sour gas‐based‐oxycombustion combined cycles.…”

Section: Oxy‐fuel Combustion In Conventional Combustion Systemsmentioning

confidence: 99%

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Oxy-fuel combustion technology: current status, applications, and trends

Nemitallah

Habib

Badr

et al. 2017

Int. J. Energy Res.

115

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Summary The increased level of emissions of carbon dioxide into the atmosphere due to burning of fossil fuels represents one of the main barriers toward the reduction of greenhouse gases and the control of global warming. In the last decades, the use of renewable and clean sources of energies such as solar and wind energies has been increased extensively. However, due to the tremendously increasing world energy demand, fossil fuels would continue in use for decades which necessitates the integration of carbon capture technologies (CCTs) in power plants. These technologies include oxycombustion, pre‐combustion, and post‐combustion carbon capture. Oxycombustion technology is one of the most promising carbon capture technologies as it can be applied with slight modifications to existing power plants or to new power plants. In this technology, fuel is burned using an oxidizer mixture of pure oxygen plus recycled exhaust gases (consists mainly of CO2). The oxycombustion process results in highly CO2‐concentrated exhaust gases, which facilitates the capture process of CO2 after H2O condensation. The captured CO2 can be used for industrial applications or can be sequestrated. The current work reviews the current status of oxycombustion technology and its applications in existing conventional combustion systems (including gas turbines and boilers) and novel oxygen transport reactors (OTRs). The review starts with an introduction to the available CCTs with emphasis on their different applications and limitations of use, followed by a review on oxycombustion applications in different combustion systems utilizing gaseous, liquid, and coal fuels. The current status and technology readiness level of oxycombustion technology is discussed. The novel application of oxycombustion technology in OTRs is analyzed in some details. The analyses of OTRs include oxygen permeation technique, fabrication of oxygen transport membranes (OTMs), calculation of oxygen permeation flux, and coupling between oxygen separation and oxycombustion of fuel within the same unit called OTR. The oxycombustion process inside OTR is analyzed considering coal and gaseous fuels. The future trends of oxycombustion technology are itemized and discussed in details in the present study including: (i) ITMs for syngas production; (ii) combustion utilizing liquid fuels in OTRs; (iii) oxy‐combustion integrated power plants and (iv) third generation technologies for CO2 capture. Techno‐economic analysis of oxycombustion integrated systems is also discussed trying to assess the future prospects of this technology. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Oxy‐fuel Combustion In Conventional Combustion Systemsmentioning

confidence: 99%

Section: Oxy‐fuel Combustion In Conventional Combustion Systemsmentioning

confidence: 99%

Oxy-fuel combustion technology: current status, applications, and trends

Nemitallah

Habib

Badr

et al. 2017

Int. J. Energy Res.

115

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“…These considerations have important implications for both the efficiency and the economics of the cycle. 21,22 Nitrogen oxides (NO x ) are not considered in this study because they are not particularly problematic in oxy-fuel combustion of gaseous fuels thanks to the very low concentrations of nitrogen in the oxidizer (at most a few percent due to imperfect air separation). 23−25 2.3.…”

Section: Modelingmentioning

confidence: 99%

“…Because in an oxy-fuel cycle the working fluid has to condense at some point, this determines from which point in the cycle expensive acid resistant materials have to be used or where a flue gas desulfurization unit should be installed. These considerations have important implications for both the efficiency and the economics of the cycle. , …”

Section: Modelingmentioning

confidence: 99%

Formation and Control of Sulfur Oxides in Sour Gas Oxy-Combustion: Prediction Using a Reactor Network Model

2015

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Sour natural gas currently requires expensive gas cleanup before it can be used in power generation because it contains large amounts of hydrogen sulfide (H2S) and carbon dioxide (CO2) that entail a low heating value and highly corrosive combustion products. A potential alternative is to use the gas directly in a gas turbine process employing oxy-fuel combustion, which could eliminate the need for gas cleanup while also enabling the application of carbon capture and sequestration, possibly combined with enhanced oil recovery (EOR). However, the exact influence of an oxy-fuel environment on the combustion products of sour gas has not been quantified yet. In this work, we used a reactor network model for the combustor and the gas turbine together with our recently assembled and validated detailed chemical reaction mechanism for sour gas combustion to investigate the influence of some basic design parameters on the combustion products of natural gas and sour gas in CO2 or H2O diluted oxy-fuel combustion as well as in conventional air combustion. Our calculations show that oxy-fuel combustion produces up to 2 orders of magnitude less of the highly corrosive product sulfur trioxide (SO3) than air combustion, which clearly demonstrates its potential in handling sulfur containing fuels. Unlike in air combustion, in oxy-fuel combustion, SO3 is mainly formed in the flame zone of the combustor and is then consumed as the combustion products are cooled in the dilution zone of the combustor and the turbine. In oxy-fuel combustion, H2O dilution leads to a higher combustion efficiency than CO2 dilution. However, if the process is to be combined with EOR, CO2 dilution makes it easier to comply with the very low levels of oxygen (O2) required in the EOR stream. Our calculations also show that it might even be beneficial to operate slightly fuel-rich because this simultaneously decreases the O2 and SO3 concentration further. The flame zone temperature in the combustor as well as the residence times in the flame zone and dilution zone have relatively little impact on SO3 formation and can hence be designed to enable good CO burnout.

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“…This kind of natural hydrocarbon gas reservoirs represent about half of the known total worldwide resources (270 trillion m 3 ) [1]. Acid gases are those raw natural H 2 S contain of sweet gases must be less than 4 ppm.…”

Section: Introductionmentioning

confidence: 99%