CO2 emissions reduction via a pinch study in a vacuum distillation unit

摘要

The project detailed here was carried out on a vacuum distillation unit(VDU)in the TUPRAS Izmir refinery.Decreasing the carbon footprint of the facilities and being eco-friendly are some of the main strategies for TUPRAS.Because the process is one of the largest units in the refinery,any energy improvement in the unit significantly affects the refinery's efficiency and carbon footprint.To determine the optimum energy efficient application,a pinch analysis of the unit was executed.The refinery staff performed pinch studies with five different cases and also changed a number of shells for new heat exchangers in end of run(EOR)and start of run(SOR).Within a VDU,SOR and EOR mean the clean stage and dirty stage of heat exchangers in a turnaround cycle,respectively.The reasons for comparing two different cases in the project are that the VDU processes heavy products;therefore,fouling occurs in the heat exchangers between turnaround periods and the heat efficiency of the pre-heat train changes dramatically.Finally,38 different scenarios were achieved for heat integration of the unit.