Retrofitting micro gas turbines for wet operation. A way to increase operational flexibility in distributed CHP plants

P. Stathopoulos and C.O. Paschereit

Applied Energy, 2015, vol. 154, issue C, 438-446

Abstract: It is generally accepted that only flexible CHP plants could be a viable option in an electrical system with high penetration of variable renewables. Variable power-to-heat-ratios and decoupled power and heat generation will be basic requirements. Currently, the most common way to fulfill these specifications is the use of heat storage devices, whereas wet operation of gas turbines is an alternative way to achieve both goals. The current work is an analysis of a micro gas turbine adapted to operate with steam injection. A thermodynamic model is developed and a typical apartments building in Berlin, Germany is chosen as a case study. The study presumes the existence of a micro gas turbine and analyzes the results of its adaptation for wet operation. The environmental and economic performance of the new system is compared to that of its commercial counterpart. It is shown that the retrofitted turbine has longer annual operation time and higher electrical energy generation. The retrofit also proves to be an attractive investment for the German CHP market with internal rates of return reaching almost 20%.

Keywords: CHP; Micro gas turbines; Operational flexibility; Wet cycles; Sensitivity analysis (search for similar items in EconPapers)
Date: 2015
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Citations: View citations in EconPapers (26)

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DOI: 10.1016/j.apenergy.2015.05.034

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