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Carbon Dioxide Gasification of Hydrothermally Treated Manure-Derived Hydrochar

Saha, Pretom
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554290140503171

Abstract Details

2019, Master of Science (MS), Ohio University, Mechanical Engineering (Engineering and Technology).
This thesis is focused on determining the kinetic parameters of pyrolysis and gasification of manure-derived hydrochar through pyrolysis and gasification experiments using Thermogravimetric analyzer (TGA) followed by developing a detailed steady-state equilibrium –based computational simulation model in Aspen Plus to demonstrate the CO2-gasification process of cow manure-derived hydrochar. Hydrochar was first pyrolyzed in TGA at heating rates of 5, 10, and 20 °C min-1 with N2 and gasified afterward with CO2 at 800, 900, and 1000 °C for 30, 60, and 90 min. Kissinger’s method was used to evaluate kinetic parameters for pyrolysis and Arrhenius method was implemented to evaluate gasification kinetic parameters. The activation energy for pyrolysis and gasification were 211.5 ± 7.7 kJ mol-1 and 270 ± 20 kJ mol-1, respectively. The simulation was performed at gasification temperature of 700-1000 °C and equivalence ratio of 0.1-0.6 for hydrothermal carbonization (HTC) treatment temperatures between 180-260 °C. Various simulation outputs including gas yield, syngas composition, lower heating value (LHV), CO/CO2 conversion efficiency, H2/CO ratio, and cold gas efficiency were evaluated. Simulation results revealed that CO concentration was increased with gasification temperature while H2 concentration was initially increased until 950 ℃ and decreased afterwards. Meanwhile, H2 concentration was decreased with the increasing equivalence ratio. However, CO concentration increased initially but started to decrease after equivalence ratio of 0.3. Gasification temperature of 850 °C and equivalence ratio of 0.3 resulted in the optimum syngas composition and LHV. A small downdraft gasifier has already been purchased which will be used in future to perform a lab scale CO2 gasification of manure-derived hydrochar to verify the findings of this simulation.
M. Toufiq Reza (Advisor)
David Bayless (Committee Chair)
Sumit Sharma (Committee Member)
Sarah Davis (Committee Member)
122 p.
Energy; Mechanical Engineering
Carbon Dioxide Gasification; KInetics Analysis; Simulation; Aspen Plus; Hydrochar

Recommended Citations

Citations

  • Saha, P. (2019). Carbon Dioxide Gasification of Hydrothermally Treated Manure-Derived Hydrochar [Master's thesis, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554290140503171

    APA Style (7th edition)

  • Saha, Pretom. Carbon Dioxide Gasification of Hydrothermally Treated Manure-Derived Hydrochar. 2019. Ohio University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554290140503171.

    MLA Style (8th edition)

  • Saha, Pretom. "Carbon Dioxide Gasification of Hydrothermally Treated Manure-Derived Hydrochar." Master's thesis, Ohio University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1554290140503171

    Chicago Manual of Style (17th edition)

ohiou1554290140503171
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This open access ETD is published by Ohio University and OhioLINK.