The decision this case can inform
Specify required operating turndown separately from the supplier’s maximum design range.
Supplier-reported evidence. Results apply only to the stated equipment, conditions and observation period.
What the public record actually establishes
- F1
A feeder upgrade allowed one unit to cover duties previously needing two.
- F2
After ten months, the supplier reports stable dosing over a 1:50 range and 25% lower conveying-air volume.
Facts and reported results are kept separate from the lesson a plant may choose to test.
Operating context
Coal feeding needed a wider operating range as fuel substitution increased.
Intervention or finding
A feeder upgrade allowed one unit to cover duties previously needing two.
Documented result
After ten months, the supplier reports stable dosing over a 1:50 range and 25% lower conveying-air volume.
Plant interpretation
Specify required operating turndown separately from the supplier’s maximum design range.
Transfer boundary
Energy improvement is unquantified. The 60 kg/hour minimum in this article refers to other installations, not demonstrated Mergelstetten operation.
Questions to verify at your plant
These are decision checks, not operating instructions. Resolve them through local risk assessment, technical review, and authorization.
- 01
Check minimum stable feed, turndown, pressure and measured blower power.
- 02
What equipment, materials and operating conditions differ at your plant?
- 03
What baseline and follow-up evidence would establish whether this change works locally?