Boiler Efficiency and Fuel Consumption — online
How efficient is your boiler really, where does the heat go, and what is a point of excess air worth?
Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 39) — the Guide, method and references are in the Excel file.
What this boiler efficiency and fuel consumption calculator does
Steam boiler efficiency by the direct and indirect methods for gas, oil and coal: excess air from flue gas O2, every heat loss, fuel consumption, and the yearly fuel and cost saved by trimming excess air or stack temperature.
- Two methods to compare. Indirect (heat-loss) efficiency from the fuel analysis and flue gas, and direct efficiency from the metered fuel flow, with the difference flagged.
- Gas, oil and coal. Fuel gas from composition in mol %, oil and coal from ultimate analysis, with HHV and LHV calculated or entered.
- Excess air and flue gas. Excess air from flue gas O2 (dry or wet, CO corrected), air-fuel ratio, flue gas flow and composition and the water dew point.
- Every heat loss. Dry flue gas, hydrogen and moisture in fuel, air moisture, CO, unburned carbon, radiation and blowdown, one by one.
- Fuel and cost. Fuel consumption, steam-to-fuel ratio, CO2 emitted and the yearly fuel heat and cost.
- What-if tables. Lower oxygen, cooler flue gas or both: new efficiency, fuel saved and money per year, with dew point checks.
How it was checked
170 recalculated runs against an independent Python model (Cantera data, iapws steam package, element-balance solver): all 96 selector combinations, SI, US, British and industry units and 66 edge cases; largest deviation 0.0005 %.
Related
- Boiler Efficiency and Fuel Consumption Excel tool — USD 39, keep the workbook, its Guide and the report sheet.
- All online tools
Questions
Is the boiler efficiency and fuel consumption calculator free?
You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all online tools (USD 15) or a yearly one (USD 99).
Are the results the same as the Excel tool?
Yes. The online tool runs the formulas of the Boiler Efficiency and Fuel Consumption Excel workbook and was checked cell by cell against the Excel file.