Application Of Gray System Theory In Type Selection Of GT Used In LNG Power Plant

Basing on the gray system theory, this paper discussed type choice of gasturbine used in LNG power plant. That is to say, under the same output, how to usethe gray system evaluation theory to choose realistically and scientifically betweensingle shaft gas-steam combined cycle power train and multi shaft gas-steamcombined cycle power train. Firstly, the author elicited one branch of the gray systemtheory that is suitable to evaluate the type of gas turbine among so many gray systemtheories------gray statistic decision method. Secondly, according to the characteristicsof two types, the author constructed an evaluation index system for gas turbine'scomprehensive performance, and a correspondent gray evaluation mathematicalmodel. Thirdly, the author applied the gray evaluation mathematical model to twotypes of gas turbine, and invited five experts to respectively mark those two types ofgas turbine. Fourthly, after necessary mathematical calculation, the author concludedthat under current conditions in China, multi shaft gas turbine is better than singleshaft gas turbine. Finally, through analyzing the application of multi shaft gas turbineto promote the localization practice of whole set of gas turbine in Korea, the authorsuggested and supposed that under current conditions in China it is better to choosemulti shaft gas turbine to powerfully promote the localization. This paper discussedproblems occurred during engineering practice, which is typical and practical. Theconclusion of this paper has certain realistic meaning to develop gas turbine powerplant and promote the localization of whole set of gas turbine in China.