Feasibility reassessment study of thermo-chemically recuperated power generation process
摘要
Revaluation of the thermo-chemically recuperated (TCR) power generation process consuming natural gas (NG) is progressing. According to the basic TCR concept, a catalyst is required. In the present study, that substance is NiO, supported by an inert solid (Al2O3). The gas stream leaving the reformer is injected into the combustor of the gas turbine. NG reforming is employed to recover energy from the stream exiting the gas turbine. Previous studies on TCR feasibility evaluations have shown relatively high efficiencies of power generation. However, those investigations did not specify the applied catalyst and used zero-order models, thus they could not evaluate the reactor’s feasibility. Additionally, none of them accounts for the power required for the catalyst regeneration, as for instance in the present case, the power consumed during the compression of air injected into the oxidation reactor. The study shows that those premises are relevant, which results in lower power generation efficiencies than previously estimated. The ongoing investigation considers different NG-Steam mixture ratios and focuses on two reformer models, the entrainment flow reactor and the bubbling fluidized bed reactor. The highest 1st law efficiency achieved is around 46%.