چكيده به لاتين
The science of combustion holds significant importance due to the increasing global demand for energy. The combustion of fossil fuels to meet energy needs has been identified as a primary contributor to global warming over the past five decades, primarily due to the release of greenhouse gases, particularly carbon dioxide. As energy demand and fossil fuel consumption continue to rise, the need for measures to reduce carbon dioxide levels and improve energy efficiency has become increasingly urgent. These measures include utilizing waste products, solid fuels, and renewable energy sources such as solar and wind power. This thesis explores the application of chemical looping combustion (CLC) to reduce carbon dioxide emissions and enhance energy efficiency. Additionally, it investigates the potential of replacing traditional air separation units with CLC technology to provide a cost-effective oxygen supply for the Allam power cycle combustion chamber. In the proposed system, carbon dioxide is supercritically compressed and employed as a coolant within the power cycle combustion chamber. Economic analysis indicates that the implementation of CLC is more cost-effective, resulting in savings of $108.76 per hour compared to traditional air separation units. Furthermore, the performance of two Allam cycle configurations a simple Allam cycle and an Allam-CLC cycle is analyzed using both natural gas and waste as fuels. The results demonstrate that increasing the inlet temperature and pressure of the turbine enhances the electrical efficiency of both cycles up to a certain point, beyond which efficiency gradually decreases due to increased energy consumption by pumps and compressors. The highest electrical efficiency achieved for the simple Allam cycle was 58.27% with natural gas and 40.44% with waste. Moreover, turbine power output increases with rising temperature, with the highest power outputs for the simple Allam cycle being 515.069 MW with natural gas and 412.532 MW with waste. Additionally, increasing the isentropic efficiency results in higher power output, with the electrical efficiency reaching 57.68% for the simple Allam cycle and 52.52% for the Allam-CLC cycle.
