Abstract
Gas turbines provide large portion of the global power generation as well as the carbon footprint. Utilizing biomass in gas turbines in externally fired gas turbine (EFGT) configuration is a promising option for the reduction of greenhouse emissions. However, only few experimental EFGT studies have been reported due to the technical difficulties and high cost associated with the development of high temperature heat exchanger for the system. An experimental turbocharger-based EFGT test-rig was developed in previous study. However, the low turbine inlet temperature (TIT) below 700 °C provided by the heat exchanger was not adequate for the turbine start-up. In this study, the heat exchanger was redesigned using annular tube configuration and eight tube sizes were compared. The optimum heat exchanger design elevated TIT up to nearly 900 °C and the turbine was able to operate at self-sustaining mode in the pressure range of 0.2–0.25 bar.
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