Modeling and Simulation of an Integrated Gasification SOFC-CHAT Cycle to Improve Power and Efficiency

摘要

Cascaded bumidification advanced turbine (CHAT) cycles are used for the enhancement of output power in conventional gas turbines. In this study, an IG-SOFC-CHAT combined cycle has been presented. The proposed cycle has been used as a novel approach for alleviating the restrictions on generated power in the SOFG-GT bybrid systems. Additionally, a significant amount of heat can be produced in this hybrid cycle, which justifies its application as a CHP system. Modeling and simulation of the cycle have been performed from the energy point of view. To generate syngas fuel from coal, an FICFB gasifier system, integrated with a low temperature gas cleaning system, has been used. Results show that compared to the conventional gas turbines, electrical power generation from the proposed IG-SOFC-CHAT cycle has been increased by about 45%, while the total energy efficiency of the comprehensive cycle is still within the acceptable range of CHP cycles. Moreover, results indicate that the output power from the proposed cycle is stable against ambient temperature variations. In addition, wastage of heat in the proposed cycle was minimized by transferring waste heat to heat sinks, which resulted in the balance of energy in the cycle. Overall results show the suitability of the proposed cycle to attain high power generation capacity in SOFC-GT hybrid systems.