Optimization of a Gas Switching Combustion process through advanced heat management strategies

S. Cloete, A. Zaabout, M.C. Romano, P. Chiesa, G. Lozza, F. Gallucci, M. van Sint Annaland, S. Amini

Research output: Contribution to journalArticleAcademicpeer-review

15 Citations (Scopus)

Abstract

Gas Switching Combustion (GSC) is a promising new process concept for energy efficient power production with integrated CO2 capture. In comparison to conventional Chemical Looping Combustion (CLC) carried out in interconnected fluidized beds, the GSC concept will be substantially easier to design and scale up, especially for pressurized conditions. One potential drawback of the GSC concept is the gradual temperature variation over the transient process cycle, which leads to a drop in electric efficiency of the plant. This article investigates heat management strategies to mitigate this issue both through simulations and experiments. Simulation studies of the GSC concept integrated into an IGCC power plant show that heat management using a nitrogen recycle stream can increase plant efficiency by 3 percentage points to 41.6% while maintaining CO2 capture ratios close to 90%. Reactive multiphase flow simulations of the GSC reactor also showed that heat management can eliminate fuel slip problems. In addition, the GSC concept offers the potential to remove the need for a nitrogen recycle stream by implementing a concentrated air injection that extracts heat while only a small percentage of oxygen reacts. Experiments have shown that, similar to nitrogen recycle, this strategy reduces transient temperature variations across the cycle and therefore merits further investigation.

Original languageEnglish
Pages (from-to)1459-1470
Number of pages12
JournalApplied Energy
Volume185
Issue numberPart 2
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Chemical Looping Combustion
  • CO capture
  • Fluidized bed reactor
  • Gas Switching Combustion
  • Power plant calculations

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