CHEMICAL LOOPING COAL GASIFICATION SIMULATION FOR IGCC PROCESS FEED

• Main Author: Adrian, Hans
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/65482
• Institution: Institut Teknologi Bandung

One of the fossil fuels which is a vital source of energy for modern society today is coal. Coal is abundant and cheap, but its use results in high carbon dioxide emissions with nearly 2 gigatons of carbon released into the world’s atmosphere annually. Coal gasification has emerged as a clean and effective way to convert solid coal into gas fuel which can be used to generate energy or heat. Hydrogen gas composition from gasification process can be increased by a chemical looping method using calcium oxide (CaO). Calcium oxide is circulated between the two reactors, CaO in the first reactor will capture CO2 by forming CaCO3 and CaCO3 which are formed then flow to another reactor to regenerate CaO. Pure CO2 obtained in this second reactor can be further processed. This process is promising to use with the Integrated Gasification Combined Cycle (IGCC) technology, but optimum conditions are needed so that the reaction can take place optimally, economically and safely for the environment. In this study, the process of coal gasification with chemical looping using CaO was modeled using Aspen Plus V11 software. Gasification parameters that affect the performance of IGCC are analyzed through sensitivity analysis in the form of gasification temperature, steam/coal ratio, pressure, and CaCO3/coal ratio. The results show that IGCC with a chemical looping system using CaO produces low specific CO2 emissions of 0.3-0.4 kg CO2/kWh than IGCC without chemical looping, which produces emissions in the range of 0.5-0.7 kg CO2/kWh—depending on the parameter being varied. The increase in temperature and the ratio of CaCO3/coal causes the specific power produced by IGCC to decrease. On the other hand, increasing pressure increases the specific power generated by the IGCC. Meanwhile, the increase in the steam/coal ratio initially increased the specific power produced by the IGCC until the steam/coal ratio reached 1.3, and then the specific power yield decreased.