Experimental and numerical study on self-sustaining performance of a 30-kW micro gas turbine generator system during startup process

• Published in: Energy (Oxford) 2021-12, Vol.236, p.121468, Article 121468
• Main Authors: Guan, Jin, Lv, Xiaojing, Spataru, Catalina, Weng, Yiwu
• Format: Article
• Language: English
• Subjects: Acceleration; Experimental validation; Fuel consumption area; Gas flow; Gas turbines; Micro gas turbine; Natural gas; Self-sustaining boundary; Start-up schedule; Superchargers; Switching; Turbines; Turbogenerators; Uncertainty analysis
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2021.121468

The safe startup of micro gas turbine (MGT) generator system is the premise of normal operation. The whole start-up process contains motor startup, ignition, speed acceleration, motor switching to generator and power acceleration. Motor switching to generator happens at the self-sustaining state, which is significant to safe start-up process. However, characteristics of MGT generator system at self-sustaining state are hardly to investigate due to the lack of performance maps and complete experiments. Therefore, this work analyzed start-up schedule and presented a theoretical and experimental study on the self-sustaining performance of MGT generator system, based on the self-designed 30 kW MGT generator system built in Jiangjin Turbocharger Plant, China. The self-sustaining speed boundary and fuel consumption area is determined from the aspects of safe startup. A novel principle for determining the self-sustaining point (SSP) is proposed. Results show that the self-sustaining state can be achieved only when speed is over 26,750 rpm, and the SSP is determined at the speed of 30,750 rpm based on the proposed principle. Finally, the self-sustaining TIT and natural gas flow are compared with the experimental data, with two relative errors both almost within 4%. This method is instructive to the MGT generator system startup process. •The startup process of MGT generator system is analyzed based on the operation laws of MGT.•Self-sustaining boundary and fuel consumption area are determined during the startup process.•A novel principle for determining the self-sustaining rotational speed is proposed.•Experimental tests at different environmental temperature and speed are conducted.•Error analysis between the model calculations and experimental data is made.