Presentation Title

Chemical Looping Combustion

Faculty Mentor

Mingheng Li

Start Date

18-11-2017 1:45 PM

End Date

18-11-2017 2:00 PM

Location

9-247

Session

Engineering/CS 3

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

The carbon dioxide concentration in the atmosphere has increased strongly over the few past decades as a result of the dependency on fossil fuels for energy production. The global atmospheric concentration of CO2 increased from a pre-industrial value of about 280 ppm to 390 ppm in 2010 [4]. Thus, various effects are taken into consideration in order preserve the well being of the planet Earth for future generations. One of the main studies hovering over this issue is the implantation of Chemical Looping Combustion (CLC). Due to the low efficiency of the CLC mechanism, this technology has not yet been considered as a grand scale model. However, considering the effectiveness of this system on lowering the carbon dioxide concentration in the atmosphere and improving effects on human life, it is promising that CLC mechanism can soon become one of the main important power generation systems. Through this study, the overall efficiency of the system and its effectiveness is studied. Through a detailed modeling of basic/un-pressurized CLC system, the main components and their effectiveness such as percent of heat recovery, amount of operation energy, and overall net power created was first analyzed. By knowing the outcomes of the unpressurized system, the main objective of this research was set to improve the overall efficiency by considering different scenarios and instances. In order to do so, three main programs were utilized. In order to perform the thermodynamic analysis of the overall system, MatLAB was used. Some of the crucial informations that were found through the usage of MatLAB include: temperature crossing, maximum allowable operating temperature, and efficiency of the system considering different hypothetical conditions.

Summary of research results to be presented

In the entirety of the project, the main objective is to enhance the overall efficiency of the system by introducing a combined rankine cycle within the non-pressurized system. Analyzing both pressurized and unpressurized systems, an efficiency of 5.1% was reached. The overall efficiency for an unpressurized system achieved a value of 13.9%; therefore, by adding an increase of that 5.1%, the pressurized system obtained 19% overall efficiency. As displayed in Figure 5, an unexpected trend was discovered, an increase in fuel reactor temperature is directly proportional to overall efficiency.

As for future work, the discrepancy with the results obtained from the trend expected should be further analyzed to determine an explanation. As discussed, it was expected to achieve an indirect relationship between the fuel reactor temperature and the efficiency of the steam turbine. An increase in fuel reactor temperature should have lead to an overall decrease in efficiency. However, the results obtained was a direct relationship between the two factors; an increase in fuel reactor temperature lead to an increase in overall efficiency. In addition, an alternative oxygen carrier should be highly considered or even a mix of these oxygen carriers, to not only have an effective CLC system but to also achieve environmental safety. An alternative oxygen carrier or even a mix of these oxygen carriers has the potential to improve the reactivity, achieving higher thermal stability which can also result in higher operational temperature. Physical properties such as density and particle size may also be improved leading to better fluidizability. Furthermore, higher crushability strength can also result in better fluidizability of the overall CLC system. In sum, the CLC process portrays great potential to enhancing the human life. In the near future, it will soon become a crucial aspect in power generation systems.

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Nov 18th, 1:45 PM Nov 18th, 2:00 PM

Chemical Looping Combustion

9-247

The carbon dioxide concentration in the atmosphere has increased strongly over the few past decades as a result of the dependency on fossil fuels for energy production. The global atmospheric concentration of CO2 increased from a pre-industrial value of about 280 ppm to 390 ppm in 2010 [4]. Thus, various effects are taken into consideration in order preserve the well being of the planet Earth for future generations. One of the main studies hovering over this issue is the implantation of Chemical Looping Combustion (CLC). Due to the low efficiency of the CLC mechanism, this technology has not yet been considered as a grand scale model. However, considering the effectiveness of this system on lowering the carbon dioxide concentration in the atmosphere and improving effects on human life, it is promising that CLC mechanism can soon become one of the main important power generation systems. Through this study, the overall efficiency of the system and its effectiveness is studied. Through a detailed modeling of basic/un-pressurized CLC system, the main components and their effectiveness such as percent of heat recovery, amount of operation energy, and overall net power created was first analyzed. By knowing the outcomes of the unpressurized system, the main objective of this research was set to improve the overall efficiency by considering different scenarios and instances. In order to do so, three main programs were utilized. In order to perform the thermodynamic analysis of the overall system, MatLAB was used. Some of the crucial informations that were found through the usage of MatLAB include: temperature crossing, maximum allowable operating temperature, and efficiency of the system considering different hypothetical conditions.