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Thesis_Sharath Reddy 2019.pdf (2.6 MB)

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Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery

Reddy, Sharath
http://orcid.org/0000-0002-7027-4539
http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902

Abstract Details

2019, Master of Science, Ohio State University, Chemical Engineering.
Fossil fuel power plants often generate sulfur species such as hydrogen sulfide or sulfur dioxide due to the sulfur content of the raw feedstocks. To combat the associated environmental, processing, and corrosion issues, facilities commonly utilize a Claus process to convert hydrogen sulfide to elemental sulfur and water. Unfortunately, the Claus process suffers in efficiency from a thermal oxidation, or combustion, step and high equilibrium reaction temperatures. In this work, two different chemical looping process configurations towards recovering sulfur and H2 are investigated: (1) 3 reactor system (SR) for sulfur recovery; (2) 2 reactor system (SHR) for sulfur and H2 recovery. Since, H2 yield and sulfur recovery in a single thermal decomposition reactor in the SHR system is limited by low H2S equilibrium conversion, a staged H2 separation approach is used to increase H2S conversion to H2 using a staged separation methodology. Steady-state simulations and optimization of process conditions are conducted in Aspen Plus v10 simulation software for the chemical looping process configurations and the Claus process. An energy and exergy analysis is done for the chemical looping and Claus processes to demonstrate the relative contribution to exergy destruction from different unit operations as well as overall exergy and energy efficiency. The two chemical looping process configurations are compared against the Claus process for similar sulfur recovery in a 629 MW integrated combined cycle gasification power plant. The SHR system is found to be the most attractive option due to a 97.11% exergy efficiency with 99.31% H2 recovery. The overall energy and exergy efficiencies of this chemical looping system are 14.74% and 21.54% points higher than the Claus process, respectively, suggesting more efficient use of total input energy.
Liang-Shih Fan, PhD (Advisor)
Bhavik Bakshi, PhD (Committee Member)
79 p.
Energy; Engineering
Sulfur recovery; Iron sulfide-based chemical looping; Hydrogen production; Exergy analysis; Energy analysis; Staged hydrogen separation

Recommended Citations

Citations

  • Reddy, S. (2019). Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902

    APA Style (7th edition)

  • Reddy, Sharath. Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery. 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902.

    MLA Style (8th edition)

  • Reddy, Sharath. "Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902

    Chicago Manual of Style (17th edition)

osu1556069387739902
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© 2019, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.