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Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
Published on: June 15, 2014
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Energy Analysis and Heat Integration in the Joint Process of Biomass Fast Pyrolysis and In Line Sorption Enhanced
Pablo Comendador1, Laura Santamaria1, Maider Amutio1
1Department of Chemical Engineering, University of the Basque Country UPV/EHU, Barrio Sarriena s/n, Leioa, 48940, Spain.
Energy & Fuels : an American Chemical Society Journal
|August 7, 2024
Summary
Sorption Enhanced Steam Reforming (SESR) improves hydrogen production from biomass fast pyrolysis by capturing CO2 in situ. This process offers higher H2 yields and purity, even achieving negative emissions, making it superior to traditional PY-SR.
Area of Science:
- Chemical Engineering
- Renewable Energy Technologies
- Process Intensification
Background:
- Biomass fast pyrolysis and steam reforming (PY-SR) is a viable route for hydrogen (H2) production.
- Process intensification strategies are needed to enhance efficiency and sustainability.
- In situ CO2 capture during reforming, known as Sorption Enhanced Steam Reforming (SESR), is a promising approach.
Purpose of the Study:
- To compare the performance of PY-SR and PY-SESR for H2 production.
- To analyze the energy requirements and optimize operating conditions for PY-SESR.
- To investigate the potential for achieving a thermally self-sustaining PY-SESR process.
Main Methods:
- Thermodynamic modeling and empirical correlations were used for simulation.
- PY-SR and PY-SESR processes were compared across various temperatures (500-800 °C) and steam-to-biomass (S/B) ratios (0-4).
- Energy demands of PY-SESR were detailed, and a heat integration scheme was proposed.
Main Results:
- PY-SESR achieved higher H2 production (0.124 kgH/kgbiomass) and purity (98 mol%) compared to PY-SR (0.118 kgH/kgbiomass, 67 mol%).
- Despite higher energy demand, PY-SESR allows milder operating conditions and in situ CO2 capture for negative emissions.
- Key energy demands include water evaporation and sorbent calcination.
Conclusions:
- PY-SESR significantly outperforms PY-SR in H2 production and purity, while enabling CO2 capture.
- A thermally self-sustaining PY-SESR process is achievable through heat recovery and char combustion.
- SESR presents a more efficient and environmentally beneficial pathway for hydrogen generation from biomass.
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