Exergy analysis of chemical-looping combustion systems

Anheden, Marie; Svedberg, Gunnar

doi:10.1016/s0196-8904(98)00052-1

Cited by 194 publications

(161 citation statements)

References 5 publications

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“…The gasified syngas from coal is combusted by oxygen carriers in the fuel reactor, the syngas combustion is described as reaction (11) However, IGCC system as a post-combustion technology requires separating CO 2 with additional recovery system that energy penalty is estimated 17.5% resulted in declining of electricity generation efficiency from 46 to 39.3% HHV (Amelio et al, 2007). Chemical looping is proposed to be combined with IGCC for syngas combustion to reduce energy penalty for CO 2 capture, and the exergetic power efficiency was estimated as high as 48.7% by employment of Fe 2 O 3 as oxygen carrier in chemical looping combustion (Anheden and Svedberg, 1998). The simulation for coal direct chemical looping combustion was estimated around 50% for electricity generation with over 90% CO 2 capture (Li and Fan, 2008).…”

Section: Methane Reforming Reaction: Ch 4 + H 2 O ↔ Co + 3h 2 (7)mentioning

confidence: 99%

Chemical Looping Process - A Novel Technology for Inherent CO2 Capture

Chiu

2012

Aerosol Air Qual. Res.

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Chemical looping is a novel energy technology that undertakes inherent CO 2 capture and has better energy efficiency than existing CO 2 capture technologies. Metal oxides (also known as oxygen carriers) are applied for the chemical looping process in place of air to offer oxygen for fuel combustion, thus enhancing CO 2 purity in the effluent stream. This article introduces the major aspects of chemical looping technology, including the oxygen carrier, reactor and fuel. Fe-, Ni-and Cu-based metal oxides were found to be suitable oxygen carriers for the chemical looping process based on the evaluation indexes of oxygen capacity, cost, reactivity, and mechanical strength. The modification of oxygen carriers by supporting materials is the typical research regime for enhancing mechanical strength and reactivity. The reactor systems currently used for the chemical looping process include fluidized and moving bed reactors. Fluidized bed reactors are well developed for gaseous fuel combustion applications, while moving bed reactors operated with a counter-flow mode between the solid fuel and oxygen carriers would enhance combustion efficiency, and reduce the operating solid inventory of oxygen carriers. Gaseous fuels, including natural gas and syngas gasified from coal, could achieve complete fuel conversion and high CO 2 yield for different combinations of oxygen carrier and reactor system. Gasification of solid fuels, including coal, petroleum coke and biomass in the fuel reactor, is a critical step that might reduce overall combustion efficiency. To improve solid fuel combustion and CO 2 yield, modification of the reactor design or operational conditions are necessary for the combustion of solid fuels by a chemical looping process.

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Section: Methane Reforming Reaction: Ch 4 + H 2 O ↔ Co + 3h 2 (7)mentioning

confidence: 99%

Chemical Looping Process - A Novel Technology for Inherent CO2 Capture

Chiu

2012

Aerosol Air Qual. Res.

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“…Natural gas [7][8][9], refinery and industrial gases [10,11], synthesis gas from coal gasification [12][13][14], and coal [15,16] have been considered to be used as fuels in a CLC system. The use of syngas from coal gasification in a CLC process could be advantageous still using solid fossil fuels [17].…”

Section: Introductionmentioning

confidence: 99%

Syngas combustion in a chemical-looping combustion system using an impregnated Ni-based oxygen carrier

Dueso

Garcı́a-Labiano

Adánez

et al. 2009

Fuel

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“…Together with the iron oxides, some extra inner material has been added to the circulating streams of oxygen carrier, since it has been reported that this may be necessary to ensure the required physical stability of the fine solid particles that contain the oxides [10]. The quantity of 0.27 mol of ZrO2 per mol of circulating FeO has been introduced for this purpose, following the same procedure as in ref.…”

Section: Clhg Reactorsmentioning

confidence: 99%

“…The quantity of 0.27 mol of ZrO2 per mol of circulating FeO has been introduced for this purpose, following the same procedure as in ref. [11], which is an intermediate value between those recommended by [7] and [10]. This inert material acts does not take part in any chemical transformation, and it acts in fact just as a heat carrier between the three reactors.…”

Section: Clhg Reactorsmentioning

confidence: 99%

“…In Ref. [10] an interesting exergy analysis of a CLC gas turbine system considering methane and syngas as fuels and nickel and iron oxides as oxygen carriers is given. Some other recent works focus on CLC combustion of syngas in gas turbine systems [11] exploring a possible integration of combined cycle power plants with carbon or biomass gasification.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic analysis of a dual power-hydrogen production system based on chemical-looping combustion

Álvaro

Montesino

Orgaz

et al. 2017

Energy

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Chemical-looping hydrogen generation (CLHG) is a chemical-looping combustion variant that allows simultaneous production of power and hydrogen. A thermodynamic analysis from the exergy method point of view of an integrated syngas-fueled CLHG cycle is carried out with the aim of contributing to the conceptual understanding and development of CLHG systems. The cycle working point is optimized in a range of conditions. The proposed system shows a very interesting potential for power, hydrogen and process heating coproduction with high efficiency.

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Exergy analysis of chemical-looping combustion systems

Cited by 194 publications

References 5 publications

Chemical Looping Process - A Novel Technology for Inherent CO2 Capture

Chemical Looping Process - A Novel Technology for Inherent CO2 Capture

Syngas combustion in a chemical-looping combustion system using an impregnated Ni-based oxygen carrier

Thermodynamic analysis of a dual power-hydrogen production system based on chemical-looping combustion

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