The different demands of oxygen carriers on the reactor system of a CLC plant – Results of oxygen carrier testing in a 120 kWth pilot plant

Mayer, Karl; Penthor, Stefan; Pröll, Tobias; Hofbauer, Hermann

doi:10.1016/j.apenergy.2015.07.053

Cited by 56 publications

(53 citation statements)

References 25 publications

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“…In addition, the air reactor in CLC is operated at relatively low temperatures using flameless “combustion” of the reduced oxygen carriers, which leads to significantly reduced NO x production, thereby eliminating the need for selective catalytic reduction (SCR). These distinct advantages offered by CLC have spurred extensive research and development activities over the past two decades, both in terms of oxygen carrier development and process scale up and demonstration …”

Section: Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethane: A Chemical Looping Approach

et al. 2016

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The current study investigates a chemical‐looping‐based oxidative dehydrogenation (CL‐ODH) concept for ethane‐to‐ethylene conversion. In this cyclic redox scheme, an oxide‐based redox catalyst is used to selectively combust hydrogen from ethane dehydrogenation. As the hydrogen product limits ethane conversion, in situ oxidation of hydrogen enhances the ethane conversion and ethylene yield. Moreover, heat required in ODH is compensated by re‐oxidation of the oxygen‐deprived redox catalyst, enabling auto‐thermal operation for the overall process. Compared to steam cracking, CL‐ODH can potentially achieve higher efficiency with lower CO2 and NOx emissions. Silica and magnesia‐supported manganese oxides are investigated. It is determined that unpromoted Mn/SiO2 and Mn/MgO redox catalysts exhibit low selectivity towards ethylene. The addition of promoters such as sodium and tungsten renders effective redox catalysts with satisfactory activity, selectivity, oxygen carrying capacity, and redox stability.

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Section: Introductionmentioning

confidence: 99%

Oxidative Dehydrogenation of Ethane: A Chemical Looping Approach

et al. 2016

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“…was used to calculate mass and energy balances of a large‐scale CLC plant (700 MW). A typical FR exhaust gas concentration from the experiments with the 120 kW pilot unit at full fuel conversion was assumed for the full‐scale plant. Chemical equilibrium was assumed at the exit of air reactor and fuel reactor using a manganese‐based oxygen carrier.…”

Section: Modellingmentioning

confidence: 99%

“…Al ibrary for modelling of gas-solid reactions such as CLC originally created by Bolhàr-Nordenkampf et al [28] was used to calculate mass and energyb alances of al arge-scale CLC plant (700 MW). At ypical FR exhaustg as concentration from the experiments [29] with the 120 kW pilot unit at full fuel conversion was assumed for the full-scale plant.C hemical equilibrium was assumed at the exit of air reactor and fuel reactor using am anganese-based oxygenc arrier. Tw od ifferents tationary steam cycles were assumed for energy conversion.…”

Section: Modellingmentioning

confidence: 99%

Concept Study for Competitive Power Generation from Chemical Looping Combustion of Natural Gas

Zerobin

Bertsch²,

Penthor

et al. 2016

Energy Tech

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Chemical looping combustion (CLC) offers the possibility for efficient fuel conversion with inherent CO2 capture and is expected to significantly reduce the energy penalty associated with CO2 capture processes. Feasibility of the concept has been shown and studied thoroughly in lab experiments whereas the potential for power generation on a large scale will depend on the process configuration. Two different scenarios for competitive power generation from atmospheric pressure CLC of natural gas have been assessed in this study using process simulation. Process design is shown and discussed based on net electric efficiencies.

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“…Hematite was used as an oxygen carrier to combust Chinese bituminous coal in a 5 kW plant by Ma et al . Hofbauer et al . operated a pilot plant for gaseous fuels with a rated power of 120 kW.…”

Section: Introductionmentioning

confidence: 97%

“…Recently,t he operationo fapressurized system that runs on iron orew as demonstrated. [20] Hematite was used as an oxygenc arrier to combust Chineseb ituminous coal in a5 kW plant by Ma et al [21] Hofbauer et al [22] operated ap ilot plant for gaseous fuels with ar ated power of 120 kW. Ab ig solid fuel CLC plant is operateda tT UD armstadt with ar ated power of 1MW.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Two‐Stage Fuel Reactor System for the Chemical‐Looping Combustion of Lignite and Bituminous Coal

et al. 2016

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To investigate the influence of the fuel characteristics on the conversion behavior in a chemical‐looping combustion facility, lignite coal dust (d90,3=233 μm) and two fractions of bituminous coal with different particle sizes (fine fraction d90,3=163 μm, coarse fraction d50,3=707 μm) were used as solid fuel. To improve the conversion performance, a pilot plant with a rated power of 25 kW was constructed with a two‐stage fuel reactor. The influence of the fuel composition, particle size, and the presence/absence of elemental oxygen on the conversion in the fuel reactor are presented. The used oxygen carrier was produced by the impregnation of γ‐alumina oxide with copper oxide, which is able to release gaseous oxygen, but loses this ability because of deactivation. The lignite dust shows a very good conversion performance and carbon capture efficiencies over 95 % as well as oxygen demands below 2 %. Both bituminous coal fractions have a good performance with regard to fuel conversion and oxygen demand but they suffer from a high carbon slip. Hence the carbon capture efficiency is around 60 % for the fine fraction and 40 % for the coarse one. The performance improvement as a result of the second stage was investigated separately, and we proved that it enhances the overall conversion. In addition, the oxygen carrier generated a favorable reaction environment by releasing elemental oxygen in the second stage of the fuel reactor.

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The different demands of oxygen carriers on the reactor system of a CLC plant – Results of oxygen carrier testing in a 120 kWth pilot plant

Cited by 56 publications

References 25 publications

Oxidative Dehydrogenation of Ethane: A Chemical Looping Approach

Oxidative Dehydrogenation of Ethane: A Chemical Looping Approach

Concept Study for Competitive Power Generation from Chemical Looping Combustion of Natural Gas

Analysis of a Two‐Stage Fuel Reactor System for the Chemical‐Looping Combustion of Lignite and Bituminous Coal

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