Exergetic Performance Analysis of a Cogeneration Plant at Part Load Operations  

作　　者：B.T. Aklilu S.I. Gilani 

机构地区：[1]Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Tronoh 31750, Perak, Malaysia

出　　处：《Journal of Energy and Power Engineering》2010年第10期1-8,共8页能源与动力工程（美国大卫英文）

摘　　要：A cogeneration plant can run at off-design due to change of load demand or ambient conditions. The cogeneration considered for this study is gas turbine based engine consists of variable stator vanes （VSVs） compressor that are re-staggered for loads greater than 50% to maintain the gas turbine exhaust gas temperature at the set value. In order to evaluate the exergetic performance of the cogeneration, exergy model of each cogeneration component is formulated. A 4.2 MW gas turbine based cogeneration plant is analysed for a wide range of part load operations including the effect of VSVs modulation. For loads less than 50%, the major exergy destruction contributors are the combustor and the loss with the stack gas. At full load, the exergy destructions in the combustor, turbine, heat recovery, compressor and the exergy loss with stack gas are 63.7, 14.1, 11.5, 5.7, and 4.9%, respectively. The corresponding first and second law cogeneration efficiencies are 78.5 and 45%, respectively. For comparison purpose both the first and second law efticiencies of each component are represented together. This analysis would help to identify the equipment where the potential for performance improvement is high, and trends which may aid in the design of future plants.

关 键 词：Gas turbine variable stator vanes COGENERATION exergy destruction part load performance. 

分 类 号：TM621.2[电气工程—电力系统及自动化] TU831.4[建筑科学—供热、供燃气、通风及空调工程]