Hydrogen production via sorbent-enhanced gasification of hydrothermally carbonized wood residues
Bibliographic record
Abstract
Biohydrogen and syngas are promising biofuels to mitigate the environmental challenges of fossil fuel emissions. Biofuels harnessed from biomass resources like spruce-pine-fir (SPF) residues, can sustainably contribute to achieving the global net-zero emission goals. This study investigates the hydrothermal carbonization (HTC) of SPF residue and models sorbent-enhanced steam gasification of SPF and its hydrochars (SPFHC_180, SPFHC_220, SPFHC_260) using calcium oxide as the CO 2 sorbent. The gasification temperature, pressure, steam-to-biomass ratio (SBR) and CaO-to-biomass ratio (CBR) were investigated to maximize syngas' hydrogen and energy content. Hydrochars' energy improved by 52 % (SPFHC_260), 22 % (SPFHC_220), and 9 % (SPFHC_180), with HTC temperature respectively, while reducing the ash content. CaO improved the H 2 content of the syngas up to 74.24 % (SPFHC_260), 82.98 % (SPFHC_220), 89.59 % (SPFHC_180) and 91.34 % (raw SPF gasification) while reducing the CO 2 by 98 % (all feeds). SBR increase raised the CO 2 concentration to 17.11 vol% (SPFHC_260), 17.58 vol% (SPFHC_220), 17.19 vol% (SPFHC_180), and 16.20 vol% (raw SPF). Higher gasification temperature maximized CO to 41.70 vol% (SPFHC_260), 35.41 vol% (SPFHC_220), 32.52 vol% (SPFHC_180), and 31.10 vol% (raw SPF). The rise in gasification pressure improved the syngas’ lower heating value (LHV) to a peak of 20.69 MJ/Nm 3 (SPFHC_260), 19.20 MJ/Nm 3 (SPFHC_220), 18.20 MJ/Nm 3 (SPFHC_180), and 17.95 MJ/Nm 3 (raw SPF). Combining HTC with sorbent-enhanced gasification of biomass has a scalable potential for energy-rich and hydrogen-rich syngas production. • HTC improved hydrochar's energy and carbon content by 52 % and 58 % respectively. • CaO reduced CO 2 content by 98 % in syngas via in-situ adsorption. • CO 2 capture boosted syngas' H 2 content to 74.24 % (hydrochar) and 91.34 % (raw SPF). • Steam-to-biomass ratio significantly influenced CO 2 and CO in syngas composition. • Combined HTC and sorbent-enhanced gasification offer efficient hydrogen production.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".