Process Analysis Study of Integrated Gasification Combined-Cycle with CO2 Capture

Abstract

The present study adopted commercial chemical process simulator, Pro/II® V8.1.1, to analyse the system performance of Integrated Gasification Combined-Cycle (IGCC) with CO2 capture. There are four major blocks in a reference IGCC plant, i.e. air separation unit (ASU), gasification island, gas clean-up unit, and combined-cycle power block. Additional water gas shift reaction and CO2 absorption processes are integrated into the gas clean-up system for CO2 capture. The feedstock is Kaltim Prima Coal (KPC) from Indonesia, which is generally used in Taiwan, to evaluate the data with actual situation in Taiwan. The results show that the efficiency of IGCC is around 42.22% (HHV). When 90% CO2 capture is employed in the IGCC, the efficiency is decreased to around 36.74% (HHV). It means that the energy penalty of 90% CO2 capture is about 5.48 percentage points. Furthermore, data of 50% CO2 capture is evaluated to reach the CO2 emission condition close to that of Natural Gas Combined-Cycle (NGCC).