Experimental Investigation and Evaluation of a Low NOx Natural Gas-Fired Mesh Duct Burner
Bibliographic record
Abstract
To increase the thermal output of a micro-turbine powered CHP system, a low NOx natural gas-fired, mesh duct burner was designed built and tested. The gas-fired burner was installed in the exhaust duct of a recuperated micro-turbine of a micro-cogeneration unit. The full-scale experimental burner was integrated with an Ingersol-Rand 70 kW micro-turbine system for the evaluation. Three wire-mesh burners with different pressure drops were used. Each burner has a conical shape made from FeCrAL alloy mat (NIT100S by ACOTECH) and their design based on a heat release per unit area of 2500 kW/m2 and a total heat release of 240 kW at 100% excess air. The local momentum of the gaseous mixture introduced through the wire-mesh was adjusted so that the flame stabilized outside the burner mesh (surface combustion). Performance of the duct burner was tested and the effect of excess air and firing rate on the stable burning zones, and emissions (NOx, CO) were measured. The range of thermal inputs at which surface combustion was maintained for the duct burner was defined by direct observation of the burner surface and monitoring of the temperature in the combustion zone. Stable combustion with low emission of pollutants was achieved at atmospheric pressure for a firing rate range of 175 to 310 kW. The total system (micro-turbine and duct burner) was shown to produce less than 5 ppm NOx for the conditions tested.
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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".