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Experimental evaluation of 100 kW grade micro humid air turbine cycles converted from a microturbine

Xu, Zhen, Lu, Yuan, Wang, Bo, Zhao, Lifeng, Chen, Changnian, Xiao, Yunhan
Energy 2019 v.175 pp. 687-693
air, combustion efficiency, heat, humidification, nitrogen oxides, turbines
Microturbines have been developed as a candidate for distributed energy and combined heat and power. A 100 kW grade test facility of micro Humid Air Turbine (mHAT) cycle was converted from a commercial recuperated microturbine. The thermodynamic and emission performances of three mHAT concepts were experimentally evaluated at nominal rated output power. The impacts of the aftercooler and part-flow humidification strategy were also discussed. Comparing to the original recuperated microturbine, the specific output power and the electrical efficiency of mHAT increase 23% and 18.9% respectively. Introducing the aftercooler into the mHAT (mHAT+) can improve the specific output power to the maximum value of 31.6%. The part-flow humidification strategy can further improve the electrical efficiency to the maximal value of 22.2% at the split ratio is equal to 0.48 in the experiment range. The minimal NOx emission in tested five cycles decreases 36.8%, but corresponding combustion efficiency shows a 2.2% reduction.