Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
METHODS FOR PERFORMANCE PREDICTING AND SIZING OF MULTISTAGE CENTRIFUGAL COMPRESSORS
Submission Author:
JOSÉ PEREIRA , SP
Co-Authors:
JOSÉ PEREIRA, GUENTHER Krieger Filho
Presenter: JOSÉ PEREIRA
doi://10.26678/ABCM.ENCIT2018.CIT18-0220
Abstract
With the crescent number of modern fertilizer plants and hydrocracking process units in oil refineries, the consumption of energy and consequently the efficiency of centrifugal compressors was made of paramount importance in present day. A consequence of this new reality is the necessity of improvement of the methods that estimate the polytropic efficiency of these compressors. Furthermore, new methods also need to predict the basic geometric parameters of each machine. Both new and former methods must comply with two scenarios: the conception phase, when the compressor need to be calculated for the basic engineering, and the quotation phase, when the supplier’s proposals are under technical analysis. Therefore, new methods of estimation must be fast and reliable. On the other side, most of the literature, which deals with polytropic efficiencies, is not up to date with the values performed by modern compressors. The main scope of present work is to compare two up to date methods of estimation, related to multistage centrifugal compressors. The proposed methods are Sandberg Method and Approximated Ludtke Method with Correction. Both of these methods give good agreement with the values performed by several compressors, as demonstrated when these methods are adopted. In this extended abstract, four real cases will be estimated by both methods and compared against supplier data; the result demonstrates good agreement among them.
Keywords
Centrifugal Compressor, polytropic efficiency, rotating machinery
