Investigation of chemical looping combustion of natural gas at 1 MWth scale

Ohlemüller, Peter; Reitz, Michael; Ströhle, Jochen; Epple, Bernd

doi:10.1016/j.proci.2018.07.035

Cited by 25 publications

(16 citation statements)

References 17 publications

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“…In comparison to other, similar materials operated in the 10 kW unit (see Table ), the material C28‐901 achieved a rather low lifetime and exhibited relatively high attrition indices at the end of the campaign. The tests conducted at TU Darmstadt with the material C28‐902 yielded a similar lifetime to the one estimated here with the material C28‐901, i.e., 500 h as compared with 700 h . The material C28‐902 was produced in a similar manner as the material C28‐901; the only differences between the two materials are the calcination furnaces used and the calcination parameters, which differed slightly.…”

Section: Resultssupporting

confidence: 61%

“…The oxygen‐carrier material C28‐902, which is similar to the material C28‐901 used here, was tested at TU Darmstadt in a continuous CLC unit with a nominal fuel input of 1 MW . The raw materials used for C28‐902 and the production method were the same as for C28‐901, but due to the larger batch size, 2.2 t in total, the calcination process might have led to different material properties.…”

Section: Resultsmentioning

confidence: 99%

“…Further operational studies were made in a differently designed 10 kW unit and a 120 kW CLC unit, including investigations of ageing and sulfur tolerance . Ultimately, experiments on a pilot scale, i.e., in a continuous reactor with nominal fuel input of 1 MW, were conducted . A project overview is given by Penthor et al…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Oxygen‐Carrier Development of Calcium Manganite–Based Materials with Perovskite Structure for Chemical‐Looping Combustion of Methane

et al. 2020

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The present work is related to the upscaling of calcium manganite–based oxygen‐carrier materials, which have a perovskite structure, both with respect to the use of inexpensive raw materials, i.e., instead of pure chemicals, and the upscaling of production to multitonne batches. Results are presented from the two different stages of material development, i.e., raw material selection and upscaling. The evaluation involves both operation in chemical‐looping combustor units of 300 W and 10 kW, and material characterization. In the latter unit, the gas velocities in the riser and in the grid‐jet zone of the gas distributor come close to gas velocities of industrial‐scale units and, therefore, this unit is also used to assess particle lifetime. Results from the various chemical‐looping combustion units and oxygen‐carrier materials produced from various raw materials of both high and low purity show that very high degrees of fuel conversion can be reached while achieving very high oxygen‐carrier lifetimes. The composition of the oxygen‐carrier materials seems robust and flexible with respect to the precursors used in its manufacturing.

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Section: Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

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Oxygen‐Carrier Development of Calcium Manganite–Based Materials with Perovskite Structure for Chemical‐Looping Combustion of Methane

et al. 2020

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“…The results are consistent with the work of Johansson [33]. The performance of CLC can be assessed by fuel conversion rate, which is defended as following [36],…”

Section: Influence Of Fuel Inlet Ratesupporting

confidence: 88%

Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

et al. 2022

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Chemical looping combustion is one novel technology for controlling CO2 emission with a low energy cost. Due to a lack of understanding of the detailed and micro behavior of the CLC process, especially for a three dimensional structure, numerical simulations are carried out in this work. The configuration is built according to the experimental unit and gaseous fuel is used in this work. A two-fluid model considering heterogeneous reactions is established, and the flow behaviour and reaction characteristics are obtained. The temperature in the air reactor increases with height owing to the exothermic reaction of the xidation of the oxygen carrier, while the temperature in the fuel reactor decreases with height due to the endothermic reaction. The oxidation level of the oxygen carrier is obtained by simulation, which is hard for measurement, and the difference between the inlet and outlet is 0.065. The influences of the operating temperature and injection rate of fuel are presented to understand the performance of the system. The highest fuel conversion rate reaches 0.92 under high operating temperature. The numerical results are helpful for acquiring insight on the flow and reactive behaviour of CLC reactors.

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“…Nevertheless, the CLC process has mostly been studied at atmospheric pressure operation, given that the dual circulating fluidized-bed reactor is the most widely used reactor configuration for CLC system. Extensive investigations using this configuration had been conducted using lab [7][8][9] and pilot scales [10,11]. The conventional dual-circulating fluidizedbed configuration combined two interconnected reactors and a gas-solid separation system (loop seals and cyclones) to avoid gas leakage between the fuel and air reactors.…”

Section: Introductionmentioning

confidence: 99%

Mapping the operating performance of a novel internally circulating fluidized bed reactor applied to chemical looping combustion

Osman

Zaabout

Cloete

et al. 2020

Fuel Processing Technology

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Chemical looping combustion is a promising technology for minimizing the energy penalty of CO2 capture. To accelerate the scale-up and commercialization of this technology for pressurized operation, the internally circulating reactor (ICR) was recently proposed. ICR integrates the two reactors, cyclones, loop seals and solids transport lines of the conventional chemical looping configuration into a single unit that simplifies design and operation. This work reports the ICR operating performance over a range of operating parameters applied to chemical looping combustion (CLC). The concept proved relatively simple to operate, allowing the oxygen-carrier circulation rate to be controlled over a wide range by varying the bed loading and the air reactor feed rate. Fully autothermal CLC operation was demonstrated as an illustration of the ease of ICR operation. Gas leakage between the two reactor chambers decreased strongly with decreasing solids loading, resulting in CO2 capture and purity up to 94% for the lowest bed loading. The data showed that significant room for further optimization of the solids transport ports in the reactor exists, which will further increase the CO2 separation performance. These results demonstrate the promise of ICR concept and provide valuable insights for the design of larger-scale units in future work.

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Investigation of chemical looping combustion of natural gas at 1 MWth scale

Cited by 25 publications

References 17 publications

Oxygen‐Carrier Development of Calcium Manganite–Based Materials with Perovskite Structure for Chemical‐Looping Combustion of Methane

Oxygen‐Carrier Development of Calcium Manganite–Based Materials with Perovskite Structure for Chemical‐Looping Combustion of Methane

Numerical Simulation of a 10 kW Gas-Fueled Chemical Looping Combustion Unit

Mapping the operating performance of a novel internally circulating fluidized bed reactor applied to chemical looping combustion

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