Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Thermodynamic analysis of biogas fired chemical looping combustion with supercritical CO2 cycle for power generation with CO2 capture
Submission Author:
Andres Enrique Requena Gonzalez , PR
Co-Authors:
Andres Enrique Requena Gonzalez, Cristian Felipe Ardila Duran, Cesar Adolfo Sotomonte, Carlos Eduardo Rodriguez Marquina
Presenter: Andres Enrique Requena Gonzalez
doi://10.26678/ABCM.COBEM2023.COB2023-2141
Abstract
According to the Intergovernmental Panel on Climate Change (IPCC), electric-power generation continues to represent the largest source of CO2 emissions. Among the available options for reducing net CO2 emissions to the atmosphere carbon capture and storage (CCS) technologies would play a major role mitigating the global warming problem. Currently, the most promising options for capturing CO2 efficiently for power plants are pre-combustion capture, post-combustion capture and oxy-fuel combustion. Nevertheless, these technologies present both technical and financial drawbacks that limit its commercial implementation on a large scale, such as the large amount of energy required for CO2 capture. As a result, a significant loss of energy efficiency, chemical looping combustion (CLC) is an emerging technology with inherent CO2 separation without energy penalties and achieve CO2 capture rates above 90%, with potential to reach so-called negative CO2 emissions when biomass is used as fuel. On the other hand, CO2 exhibits attractive properties such as high density, low viscosity, low toxicity and flammability index, making it an interesting working fluid option for power generation cycles. The integration of a supercritical CO2 Brayton cycle in a CLC process is characterized by its simplicity, economic advantages, compact size, and high efficiency compared to conventional power cycles, so it has great potential for commercialization. This work assess the thermodynamic performance of a proposed power plant using Aspen Plus. The net efficiency of the power plant cycle is expected to be around 50% and with 95% carbon capture. Preliminary results show that the use of these technologies with biogas as fuel can be a promising technological option to reduce CO2 concentrations in the atmosphere, and simultaneously, increase the Brazilian energy matrix with renewable energy sources.
Keywords
Chemical Looping Combustion, Supercritical CO2 Brayton cycle, Biogas, Power generation, CCS
