Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
EXERGY ANALYSIS OF A GAS COMPRESSION SYSTEM IN OFFSHORE OIL PLATFORMS
Submission Author:
Felipe Daloia , SP
Co-Authors:
Yamid Alberto Carranza Sanchez, Silvio de Oliveira Junior
Presenter: Felipe Daloia
doi://10.26678/ABCM.ENCIT2016.CIT2016-0481
Abstract
Despite the recent decrease in oil price, the energetic matrix for the forthcoming decades still presents petroleum as the most relevant energy resource, with a significant price recovery expected for the following years. Environmental requirements tend to become stricter for all the industries, especially for energy companies. In this scenario, the rational use of natural resources and the energetic optimization play a key role for the Oil & Gas industry to assure a competitive edge. Among the analysis methods in use for assessing and improving the energetic efficiency, during last decades the Exergy Method has been highlighted as the most appropriated tool for these evaluations. This study performs exergy analysis in a typical process plant at a FPSO operating in the Brazilian shore waters, exploring the pre-salt layer. Special attention is given to the gas compression process plant, which has a CO2 gas removal system by membranes. According to operational restrictions, the gas flow can be deviated from the CO2 gas removal system, creating the operational modes. The operational mode A deviates all the gas from the CO2 gas removal system, allowing just its re-injection into the reservoir. The mode B uses entirely the CO2 removal system in a way that a maximum of gas exportation is possible. And the operational mode C treats partially the gas through the system, allowing partial exportation and re-injection of the gas. Scenarios related to the balance between exported and injected gas flows and its influence in the exergy balance are also presented. The influence of each operational mode and the scenarios in the exergy efficiency of the platform is verified, as well as at the specific exergy consumption, CO2 emissions and emissions per unit of produced exergy. A rational efficiency range from 8.2 to 10.9% is verified, with operational mode A as the most eficcient; the process plant also presents specific exergy consumption varying from 645 to 760 kJ/m³ and specific CO2 emissions from 7.8 to 9.6 kg/GJ, also with operational mode A as the most favorable one.
Keywords
exergy, Exergy Analysis, offshore platform, emissions, exergy, Exergy Analysis, offshore platform, emissions, exergy, Exergy Analysis, offshore platform, emissions
