Abstract
Efficient and flexible operation is essential for competitiveness in the energy market. However, the CO2 emissions of conventional power plants have become an increasingly significant environmental dilemma. In this study, the optimization of a steam power process of an IGCC was carried out, which improved the overall performance of the plant. CCPP with a subcritical HRSG was modelled using EBSILON Professional. The numerical results of the model were validated by measurements for three different load cases (100, 80, and 60%). The results are in agreement with the measured data, with deviations of less than 5% for each case. Based on the model validation, the model was modified for the use of syngas as feed and the integration of heat into an IGCC process. The integration was optimized with respect to the performance of the CCPP by varying the extraction points, adjusting the steam parameters of the extractions and modifying the steam cycle. For the 100% load case, a steam turbine power achieved increase of +34.2%. Finally, the optimized model was subjected to a sensitivity analysis to investigate the effects of varying the extraction mass flows on the output.
Highlights
Energy is one of the most influential sectors driving political, economic and social changes in the world [1,2,3,4]
The results showed that the performance of USC was better than for Integrated Gasification Combined Cycle (IGCC) power plants because the efficiency of the USC was 44.8% compared to 43.9% for the IGCC
The present work is focused on the optimization of heat integration in an IGCC that uses an HTW gasifier for cogasification of lignite and refuse-derived fuels (RDF) for polygeneration of electricity and methanol
Summary
Energy is one of the most influential sectors driving political, economic and social changes in the world [1,2,3,4]. The Integrated Gasification Combined Cycle (IGCC) process is based on already welldeveloped gas and steam power plants that achieve a thermal efficiency of 60% when fired with natural gas [16]. It was noted that there was an increase in the thermal regeneration penalty when the carbon capture level was high, reducing the efficiency and IGCC power plant output. This impact was not significant in the case of a post combustion carbon capture plant. The present work is focused on the optimization of heat integration in an IGCC that uses an HTW gasifier for cogasification of lignite and refuse-derived fuels (RDF) for polygeneration of electricity and methanol This shows promising improvements that could be implemented for better energy utilization.
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