Calculation and analysis of performances for small gas turbine cogeneration system

Much attention is now increasingly paid to the CHP systems of low capacity the main part of which is a small gas turbine because of the environmental regulations, energy saving and its safety. The present study is to present the method of evaluating and analyzing the performance parameters for the small gas turbine co-generation system based on the first and second laws of thermodynamics and the combustion stoichiometry aiming at the plant cycle efficiency, fuel utilization efficiency and second law efficiency. It pays much attention to the effects of some important parameters of compressor pressure ratio, turbine inlet temperature, pressure of the process steam, and the pinch point temperature difference on the performances. A case of example using the micro-turbine of 200kW as the main part of the system is carried out. It provides a practical and feasible method and much data for reasonable design of such CHP systems.