N2 - In the paper the results of analysis of an integrated gasification combined cycle IGCC polygeneration system, of which the task is to produce both electricity and synthesis gas, are shown. Assuming the structure of the system and the power rating of a combined cycle, the consumption of the synthesis gas for chemical production makes it necessary to supplement the lack of synthesis gas used for electricity production with the natural gas. As a result a change of the composition of the fuel gas supplied to the gas turbine occurs. In the paper the influence of the change of gas composition on the gas turbine characteristics is shown. In the calculations of the gas turbine the own computational algorithm was used. During the study the influence of the change of composition of gaseous fuel on the characteristic quantities was examined. The calculations were realized for different cases of cooling of the gas turbine expander’s blades (constant cooling air mass flow, constant cooling air index, constant temperature of blade material). Subsequently, the influence of the degree of integration of the gas turbine with the air separation unit on the main characteristics was analyzed. L1 - http://journals.pan.pl/Content/94477/PDF/09_paper.pdf L2 - http://journals.pan.pl/Content/94477 PY - 2013 IS - No 4 December EP - 159 DO - 10.2478/aoter-2013-0034 KW - gas turbine KW - Integrated gasification combined cycle KW - thermodynamic analysis KW - Natural gas and syngas fuel mixture KW - Change of load A1 - Bartela, Łukasz A1 - Kotowicz, Janusz PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2013 T1 - Analysis of operation of the gas turbine in a poligeneration combined cycle SP - 137 UR - http://journals.pan.pl/dlibra/publication/edition/94477 T2 - Archives of Thermodynamics