Gas switching reforming (GSR) for power generation with CO2 capture: Process efficiency improvement studies

Nazir, Shareq Mohd; Cloete, Jan Hendrik; Cloete, Schalk; Amini, Shahriar

doi:10.1016/j.energy.2018.11.023

Cited by 17 publications

(5 citation statements)

References 25 publications

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“…4) An advanced method with a high degree of process integration where the steam in the CLC FR outlet stream is efficiently used in the reforming process: 90% efficiency and 100% capture. Thus, the thermal energy required for steam generation, which is the largest energy penalty in advanced reforming processes, is avoided. This could be achieved by either feeding part of the CLC FR outlet stream to an MA‐CLR process or using a two‐phase flow heat exchanger to recover the condensation enthalpy from the CLC FR outlet stream for generating steam for reforming.…”

Section: Resultsmentioning

confidence: 99%

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%

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

2019

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“…This case is similar to the base case, with the main difference being better low-temperature heat recovery from the syngas and flue gas streams via parallel heat exchangers. The largest gain comes from recovering a large fraction of the condensation enthalpy in the remaining steam after the water-gas shift unit, aided by a two-phase heat exchanger fed with natural gas and liquid water [22] to reduce the amount of steam that must be supplied via the back-pressure turbine. 3.…”

Section: Case Descriptionmentioning

confidence: 99%

Blue, green, and turquoise pathways for minimizing hydrogen production costs from steam methane reforming with CO2 capture

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et al. 2022

Energy Conversion and Management

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“…When the produced hydrogen is combusted in a gas turbine, all the energy required to raise the steam in the hydrogen production process is lost because the condensation enthalpy of the steam resulting from hydrogen combustion cannot be converted to useful work. Nazir et al [24] reported that this steam-related penalty accounts for about 5.8%-points of the 7.2%-point energy penalty of a combined cycle power plant fired by hydrogen from a gas switching reforming (GSR) process, illustrating the importance of this energy penalty. GSR works on the CLR principle, only keeping the oxygen carrier in a single reactor with switching valves to alternately expose it to different gases.…”

Section: Description Of the Concept Working Principlementioning

confidence: 99%

Efficient Production of Clean Power and Hydrogen Through Synergistic Integration of Chemical Looping Combustion and Reforming

2020

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Chemical looping combustion (CLC) technology generates power while capturing CO2 inherently with no direct energy penalty. However, previous studies have shown significant energy penalties due to low turbine inlet temperature (TIT) relative to a standard natural gas combined cycle plant. The low TIT is limited by the oxygen carrier material used in the CLC process. Therefore, in the current study, an additional combustor is included downstream of the CLC air reactor to raise the TIT. The efficient production of clean hydrogen for firing the added combustor is key to the success of this strategy. Therefore, the highly efficient membrane-assisted chemical looping reforming (MA-CLR) technology was selected. Five different integrations between CLC and MA-CLR were investigated, capitalizing on the steam in the CLC fuel reactor outlet stream to achieve highly efficient reforming in MA-CLR. This integration reduced the energy penalty as low as 3.6%-points for power production only (case 2) and 1.9%-points for power and hydrogen co-production (case 4)—a large improvement over the 8%-point energy penalty typically imposed by post-combustion CO2 capture or CLC without added firing.

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Gas switching reforming (GSR) for power generation with CO2 capture: Process efficiency improvement studies

Abstract: This is the accepted version of a paper published in. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.

Cited by 17 publications

References 25 publications

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

Efficiency Improvement of Chemical Looping Combustion Combined Cycle Power Plants

Blue, green, and turquoise pathways for minimizing hydrogen production costs from steam methane reforming with CO2 capture

Efficient Production of Clean Power and Hydrogen Through Synergistic Integration of Chemical Looping Combustion and Reforming

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