Techno-economic assessment of a plant based on a three reactor chemical looping reforming system

Khan, Mohammed N.; Shamim, Tariq

doi:10.1016/j.ijhydene.2016.09.016

Cited by 66 publications

(31 citation statements)

References 17 publications

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“…Figure depicts the net electrical efficiency, the carbon capture efficiency, and the energy efficiency penalty for the NGCC plant without CO 2 capture, the CLC combined cycle plant, the CLC plant with NG‐fired COMB, and the CLC plant with H 2 ‐fired COMB. There are various H 2 production processes with different production and carbon capture efficiencies . Therefore, the source of H 2 from the conventional production process such as steam methane reforming with post‐combustion CO 2 capture to the most ideal H 2 production processes is considered in the current study.…”

Section: Resultsmentioning

confidence: 99%

“…There are various H 2 production processes with different production and carbon capture efficiencies. [38,[40][41][42] Therefore, the source of H 2 from the conventional production process such as steam methane reforming with post-combustion CO 2 capture to the most ideal H 2 production processes is considered in the current study. For ease of comparison, four subcases are considered with different H 2 production and carbon capture efficiencies.…”

Section: Plant Performance With An Additional Combmentioning

confidence: 99%

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Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

2019

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Chemical‐looping combustion (CLC) is an innovative technology for power production with inherent carbon dioxide (CO2) capture. Even though CLC imposes no direct energy penalty for CO2 capture, previous works have shown significant energy penalties relative to natural gas (NG) combined cycle plants. This is due to the relatively low turbine inlet temperature (TIT), which is limited by the oxygen carrier used in the CLC process. Therefore, herein, an additional combustor (COMB) is included downstream of the CLC unit to raise the TIT (dependent on the CLC/COMB outlet temperature [COT] and the blade cooling). When NG is used in the additional COMB, the energy penalty is only 2.9% points with 72% CO2 capture. Achieving higher CO2 capture requires the use of H2 fuel in the COMB. The efficiency of the H2 production process plays an important role. For conventional H2 production with post‐combustion CO2 capture, the added COMB brings no improvement and the energy penalty is 8.8% points. For an advanced H2 production process (90% efficiency), the energy penalty reduces to 4.5% points with 100% CO2 capture. The results show the potential of CLC‐combined cycle power plants with an additional COMB to minimize the energy penalty of CO2 capture.

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Section: Resultsmentioning

confidence: 99%

Section: Plant Performance With An Additional Combmentioning

confidence: 99%

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

2019

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“…However, in recent years, research has focused more on atmospheric pressure systems because of the operational challenges of solids circulation at high pressure, as CO 2 separation has a minimal energy penalty even at atmospheric pressure. In addition to using the chemical looping scheme for combustion, the scheme has been proposed as a method to produce syngas [5], hydrogen [6], maleic anhydride [7], methanol [8], and sulfuric acid [9].…”

Section: Introductionmentioning

confidence: 99%

Chemical Looping Combustion of Hematite Ore with Methane and Steam in a Fluidized Bed Reactor

2017

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Chemical looping combustion is considered an indirect method of oxidizing a carbonaceous fuel, utilizing a metal oxide oxygen carrier to provide oxygen to the fuel. The advantage is the significantly reduced energy penalty for separating out the CO 2 for reuse or sequestration in a carbon-constrained world. One of the major issues with chemical looping combustion is the cost of the oxygen carrier. Hematite ore is a proposed oxygen carrier due to its high strength and resistance to mechanical attrition, but its reactivity is rather poor compared to tailored oxygen carriers. This problem is further exacerbated by methane cracking, the subsequent deposition of carbon and the inability to transfer oxygen at a sufficient rate from the core of the particle to the surface for fuel conversion to CO 2 . Oxygen needs to be readily available at the surface to prevent methane cracking. The purpose of this work was to demonstrate the use of steam to overcome this issue and improve the conversion of the natural gas to CO 2 , as well as to provide data for computational fluid dynamics (CFD) validation. The steam will gasify the deposited carbon to promote the methane conversion. This work studies the performance of hematite ore with methane and steam mixtures in a 5 cm fluidized bed up to approximately 140 kPa. Results show an increased conversion of methane in the presence of steam (from 20-45% without steam to 60-95%) up to a certain point, where performance decreases. Adding steam allows the methane conversion to carbon dioxide to be similar to the overall methane conversion; it also helped to prevent carbon accumulation from occurring on the particle. In general, the addition of steam to the feed gas increased the methane conversion. Furthermore, the addition of steam caused the steam methane reforming reaction to form more hydrogen and carbon monoxide at higher steam and methane concentrations, which was not completely converted at higher concentrations and at these residence times.

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“…In this process, an oxygen carrier (OC) is used to transfer oxygen from air to the fuel. This process is economical and the cost of H 2 produced is in parity with other H 2 production technologies [3]. It employs three reactors: fuel reactor, steam reactor and air reactor.…”

Section: Introductionmentioning

confidence: 99%

“…The model is similar to that used by Khan and Shamim [3] in their techno-economic assessment. All the sub-models and assumptions used are similar.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

Khan

Shamim

2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.Hydrogen production by using a three reactor chemical looping reforming (TRCLR) technology is an innovative and attractive process. Fossil fuels such as methane are the feedstocks used. This process is similar to a conventional steam-methane reforming but occurs in three steps utilizing an oxygen carrier. As the oxygen carrier plays an important role, its selection should be done carefully. In this study, two oxygen carrier materials of base metal iron (Fe) and tungsten (W) are analysed using a thermodynamic model of a three reactor chemical looping reforming plant in Aspen plus. The results indicate that iron oxide has moderate oxygen carrying capacity and is cheaper since it is abundantly available. In terms of hydrogen production efficiency, tungsten oxide gives 4% better efficiency than iron oxide. While in terms of electrical power efficiency, iron oxide gives 4.6% better results than tungsten oxide. Overall, a TRCLR system with iron oxide is 2.6% more efficient and is cost effective than the TRCLR system with tungsten oxide.

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Techno-economic assessment of a plant based on a three reactor chemical looping reforming system

Cited by 66 publications

References 17 publications

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

Chemical Looping Combustion of Hematite Ore with Methane and Steam in a Fluidized Bed Reactor

Comparison of Iron and Tungsten Based Oxygen Carriers for Hydrogen Production Using Chemical Looping Reforming

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