ENERGY AND EXERGY ANALYSIS OF AN IGCC WITH IN-SITU CO 2 CAPTURE

ABSTRACT Within this study energetic and exergetic theoretical analyses of a novel IGCC power plant concept with CO 2 capture are carried out. The core process of the concept examined is based on the high pressure steam gasification of high moisture low grade coals where CO 2 is captured reacting exothermically with CaO-based sorbents and high hydrogencontent carbon-free fuel gas is produced without using additional shift reactors and CO 2 separation stages. The carbonated sorbents are continuously fed to an oxygen blown calcination reactor where pure CO 2 is released and active CaO is reproduced. This concept can be realised in a dual fluidised bed reactor system where coal gasification and CaCO 3 calcination are taking place simultaneously. In this paper possible plant configurations are presented and detailed simulation of 400 MW e IGCC power plant based on a state of the art gas turbine cycle with a three pressure stage heat recovery steam generator is performed using the ASPEN Plus simulator. The calculated results demonstrate the capability of the power plant to deliver almost decarbonised electricity while achieving net plant efficiencies at about 38.4 % of coal lower heating value (LHV). Based on the energy analysis and the data generated from the simulation an exergy analysis was performed in order to quantify and localize the thermodynamic irreversibility in each process component as well as to asses the overall thermodynamic imperfection of the proposed process

CO2 capture and storage in Greece: A case study from komotini ngcc power plant

The aim of this paper is to examine the possibilities for the abatement of CO2 emissions in the Greek fossil fuel power generation sector. An overview of CO2 capture, transportation, and storage concepts, on which the R&D community is focused, is presented. The implementation of post-combustion CO2 capture options in an existing fossil fuel power plant is then examined and the consequences on the overall plant performance are determined. Finally, the possibilities of transportation and then underground storage of the pure CO2 stream are analyzed taking into account both technical and economical factors. The results of this analysis show that CO2 sequestration is technically feasible for existing fossil fuel fired power plants in Greece. However, substantial reduction in plant efficiency is observed due to increased energy demand of the technologies used as well as in electricity production cost due to capital and operation costs of capture, transport, and storage of CO2.