Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery
| Main Author: | |
|---|---|
| Language: | English |
| Published: |
The Ohio State University / OhioLINK
2019
|
| Subjects: | |
| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902 |
| id |
ndltd-OhioLink-oai-etd.ohiolink.edu-osu1556069387739902 |
|---|---|
| record_format |
oai_dc |
| spelling |
ndltd-OhioLink-oai-etd.ohiolink.edu-osu15560693877399022021-08-03T07:10:40Z Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery Reddy, Sharath Energy Engineering Sulfur recovery Iron sulfide-based chemical looping Hydrogen production Exergy analysis Energy analysis Staged hydrogen separation 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 H<sub>2</sub> are investigated: (1) 3 reactor system (SR) for sulfur recovery; (2) 2 reactor system (SHR) for sulfur and H<sub>2</sub> recovery. Since, H<sub>2</sub> yield and sulfur recovery in a single thermal decomposition reactor in the SHR system is limited by low H<sub>2</sub>S equilibrium conversion, a staged H<sub>2</sub> separation approach is used to increase H<sub>2</sub>S conversion to H<sub>2</sub> 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% H<sub>2</sub> 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. 2019-09-30 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902 http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Energy Engineering Sulfur recovery Iron sulfide-based chemical looping Hydrogen production Exergy analysis Energy analysis Staged hydrogen separation |
| spellingShingle |
Energy Engineering Sulfur recovery Iron sulfide-based chemical looping Hydrogen production Exergy analysis Energy analysis Staged hydrogen separation Reddy, Sharath Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| author |
Reddy, Sharath |
| author_facet |
Reddy, Sharath |
| author_sort |
Reddy, Sharath |
| title |
Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| title_short |
Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| title_full |
Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| title_fullStr |
Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| title_full_unstemmed |
Energy and Exergy Analysis of Chemical Looping Systems for Hydrogen and Sulfur Recovery |
| title_sort |
energy and exergy analysis of chemical looping systems for hydrogen and sulfur recovery |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2019 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1556069387739902 |
| work_keys_str_mv |
AT reddysharath energyandexergyanalysisofchemicalloopingsystemsforhydrogenandsulfurrecovery |
| _version_ |
1719455524907384832 |