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Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
Published on: October 25, 2017
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Chemical Looping Combustion Using Two Different Perovskite Based Oxygen Carriers: A Pilot Study.
Karl Mayer1, Stephan Piesenberger1, Stefan Penthor1
1Institute for Chemical Environmental and Biological Engineering TU Wien Getreidemarkt 9/166 1060 Vienna / Austria.
Energy Technology (Weinheim, Germany)
|February 19, 2019
Summary
Two perovskite oxygen carriers, C14 and C28, were tested for chemical looping combustion. Both materials effectively converted natural gas, with optimal performance at 960°C, demonstrating potential for efficient combustion processes.
Area of Science:
- Materials Science
- Chemical Engineering
- Combustion Science
Background:
- Chemical looping combustion (CLC) offers a promising route for efficient and low-emission combustion.
- Oxygen carriers capable of oxygen uncoupling (CLOU) enhance CLC efficiency by releasing oxygen at low partial pressures.
- Perovskite materials are being explored as advanced oxygen carriers for CLC applications.
Purpose of the Study:
- To investigate the performance of two perovskite-based oxygen carriers, C14 (CaMn0.9Mg0.1O3-δ) and C28 (CaMn0.775Mg0.1Ti0.125O3-δ), in a pilot-scale chemical looping combustion plant.
- To evaluate the effect of operating temperature, active inventory, and air equivalence ratio on the oxygen carriers' performance.
- To assess the oxygen release capacity via oxygen uncoupling (CLOU) and the fuel conversion efficiency.
Main Methods:
- Experimental testing of C14 and C28 oxygen carriers in a 120 kWth pilot plant.
- Operation across temperatures ranging from 800°C to 960°C.
- Analysis of particle characteristics and performance data from 75 operating points over 29.5 h (C14) and 22.7 h (C28).
Main Results:
- Both C14 and C28 demonstrated full conversion of natural gas.
- Optimal performance was observed at 960°C, the highest tested temperature.
- Approximately 10% of the total available oxygen was released via oxygen uncoupling.
- Performance was sensitive to the air equivalence number, with low oxygen partial pressures leading to incomplete fuel conversion.
Conclusions:
- Perovskite oxygen carriers C14 and C28 are suitable for chemical looping combustion with oxygen uncoupling.
- High operating temperatures (960°C) and controlled air equivalence ratios are crucial for efficient operation.
- Further optimization of operating conditions can enhance the effectiveness of these materials in CLC systems.
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