Contribution to the Understanding of Secondary Pyrolysis of Biomass-Based Slurry under Entrained-Flow Gasification Conditions
Bibliographic record
Abstract
The objective of this study was to gain insight into the secondary pyrolysis of biomass-based slurry under entrained-flow gasification conditions. The focus was set on the types of solid products from secondary pyrolysis, their mechanism of formation, and subsequent conversion behavior. Primary chars and pyrolysis oils from wood and wheat straw were produced in a screw pyrolysis reactor. A suspension fuel (slurry) was prepared composed of primary straw char and straw pyrolysis oil. A drop tube reactor was used to study the secondary pyrolysis of the different fuels at 1200 °C and 3 s residence time. The secondary pyrolysis of both chars yielded approximately 60 m% of secondary char. While the wood char reactivity was unchanged by the secondary pyrolysis, the straw char showed signs of massive deactivation, which is most likely explained by the loss of catalytic activity. The secondary pyrolysis of both pyrolysis oils yielded approximately 20 m% of secondary char and soot. Cenospheres could be identified with diameters close to the initial droplet diameter. Oil cenospheres and soot had similar chemical compositions but showed very different reactivities, which is likely to be explained by their different structures. The secondary pyrolysis of the straw-based slurry showed results similar to those of the secondary pyrolysis of oil with primary char particles being embedded in the cenosphere carbon shell. Additional thermogravimetric measurements revealed possible conversion mechanisms of cenospheres from oil and slurry feed.
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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) | 0.001 | 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".