Abstract:

The output and heat consumption of the gassteam combined cycle cogeneration units are affected by ambient temperature and operating parameters. To have a better understanding on the thermodynamic property of cogeneration units, and provide a sound theoretical and data basis for the optimized operation, taking a GE 6F gas turbine as the research object, effects of ambient temperature and load ratio on the performance of gas turbines are analyzed.The study results show that with the increase of ambient temperature, the power output and efficiency of gas turbine decreases greatly, and so does the combined cycle output. At full load, due to the influence of bottom cycle,there is an optimum ambient temperature for maximized combined cycle efficiency. The fluctuation of gas turbine load ratio will impact the peak load regulating capacity of cogeneration units.With the increase of heat supply, the combined cycle  power output shows a linear decrease and a critical heating value, which means load ratio of gas turbine anticorrelated with the efficiency of combined cycle.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">gasfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">steam combined cycle;ambient temperature;load ratio;power output;efficiency;peak load regulating