Eventos Anais de eventos
MECSOL 2022
8th International Symposium on Solid Mechanics
NUMERICAL STRUCTURAL ANALYSES OF SUPERCRITICAL CO2 CENTRIFUGAL COMPRESSORS
Submission Author:
Diego Zilli Lima , SP
Co-Authors:
Diego Zilli Lima, Lucas Nunes de Carvalho, Daniel Dezan, Elóy Esteves Gasparin, Vitor Cesar Nogueira Mattos, Leandro Salviano, Paulo Eduardo Batista de Mello, Fabio Saltara, Jurandir Itizo Yanagihara, Wallace Ferreira
Presenter: Diego Zilli Lima
doi://10.26678/ABCM.MECSOL2022.MSL22-0175
Abstract
The emission of carbon dioxide (CO2) is the main cause of the greenhouse effect, its presence in the atmosphere increased from 280 ppm in 1750 to more than 400 ppm in the current years. Thus, in addition to the direct reduction using new forms of energy, it is necessary to advance toward Carbon Capture, Storage, and Utilization (CCSU) technologies. The research focused on CCSU is expanding knowledge on the use of CO2 in a supercritical state (sCO2). Because both in transport and in employment in power cycles, the use of sCO2 as a working fluid provides compact and more efficient equipment. However, their properties have a highly nonlinear behavior near the critical point. But the use of inlet conditions close to this region maximizes the advantages of sCO2, corroborating for new research to be carried out to improve the numerical design models. Regarding the structure, the use of sCO2 as a working fluid provides the construction of more compact structures, reducing the mass of the components as well as the cost of materials. However, due to the high specific mass, the aerodynamic loads originating from the fluid-structural interaction have a greater amplitude, in addition, to directly affecting the impeller vibration modes, requiring careful studies regarding the structural failure modes and, therefore, modal analysis for resonance verification are essential to enable the structural integrity of the turbomachine and design components with long service life. In this context, this work focused on static and modal structural analyzes in three case studies, the first was conducted with a centrifugal compressor present in the literature, and the following two with application in CCSU. From the analyzes carried out, new geometries for the compressors were proposed. The results showed that for the compressor available in the literature and the first stage, the aerodynamic loads did not exert great influence on the static behavior, however, for the case of the fourth stage, they were the main source of loading and had to be treated in detail.
Keywords
structural analysis, Centrifugal Compressor, fluid-structure interaction, finite element analysis., Optimization
