The advantages of reinjecting steam from the heat recovery steam generator (HRSG) in the preceding gas turbine are increased power and electrical efficiency at low specific cost and a high operating flexibility. The discharge of the injected steam to the ambient has however two major drawbacks: (1) a relevant water consumption and (2) a large thermal loss related to the latent heat of steam. An open absorption heat pump cycle (HT-CBT) downstream of the HRSG can solve both problems, as it allows to recover the steam from the flue gas and use its condensation heat at elevated temperature. This paper presents a concept to efficiently integrate both technologies and assesses the potential of the absorption system for a steam injected gas turbine (STIG). Over a wide range of steam injection rates, the power output of the plant can be varied without the associated energetic penalty achieving improvements in the fuel efficiency of up to 26%.     «

The advantages of reinjecting steam from the heat recovery steam generator (HRSG) in the preceding gas turbine are increased power and electrical efficiency at low specific cost and a high operating flexibility. The discharge of the injected steam to the ambient has however two major drawbacks: (1) a relevant water consumption and (2) a large thermal loss related to the latent heat of steam. An open absorption heat pump cycle (HT-CBT) downstream of the HRSG can solve both problems, as it allows...     »