Estimate hydrogen yield from steam reforming conditions. Compare conversion, selectivity, efficiency, and output in seconds. Built for engineers reviewing reformer performance across operating cases.
| Case | CH4 Feed | S/C Ratio | Conversion | CO Share | CO2 Share | Temp | Pressure |
|---|---|---|---|---|---|---|---|
| Base | 100 | 3.0 | 85% | 40% | 60% | 850 °C | 20 bar |
| High Steam | 120 | 3.4 | 88% | 35% | 65% | 870 °C | 18 bar |
| Lower Activity | 95 | 2.8 | 80% | 48% | 52% | 820 °C | 22 bar |
The calculator uses methane steam reforming and water gas shift stoichiometry. One mole of methane can produce three moles of hydrogen if carbon leaves as carbon monoxide, or four moles if carbon leaves as carbon dioxide.
Theoretical H2 = Converted CH4 × (3 × CO fraction + 4 × CO2 fraction)
Converted CH4 = CH4 feed × conversion fraction
Estimated Actual H2 = Theoretical H2 × performance factor
Hydrogen Yield (%) = Actual H2 ÷ Theoretical H2 × 100
The performance factor combines steam adequacy, temperature, pressure, catalyst activity, and system losses to create a practical operating estimate for engineering screening.
Steam reforming converts methane and steam into synthesis gas that contains hydrogen, carbon monoxide, and carbon dioxide. In a simple screening model, higher methane conversion increases hydrogen production directly because more feed reaches the reforming and shift pathways. This calculator links conversion, carbon distribution, and operating modifiers to estimate theoretical and practical hydrogen yield for preliminary engineering review. It also summarizes hydrogen per feed and carbon efficiency, giving engineers fast comparison metrics during early case development and routine performance review meetings each week internally.
Primary reforming is strongly endothermic, so temperature remains one of the most influential variables. Industrial tubular reformers often operate around 780 to 900 °C, where methane conversion improves and hydrogen output rises. The calculator reflects this trend with a temperature factor that rewards hotter operation within practical bounds while avoiding unrealistic gains outside screening conditions.
Steam-to-carbon ratio affects equilibrium, catalyst protection, and downstream reliability. Ratios near 2.5 to 3.5 are common in many plants because they reduce carbon deposition risk and support better methane conversion. Excess steam, however, adds energy demand to the fired heater and steam system. The calculator therefore treats steam ratio as a yield driver, not an unlimited benefit.
Higher pressure can penalize equilibrium conversion in the reformer even when it benefits later process sections. Catalyst condition also changes plant performance over time through deactivation, poisoning, or fouling. The activity factor in this calculator helps engineers compare fresh and aged catalyst behavior quickly. A moderate pressure penalty and activity adjustment together create a more realistic plant-level estimate.
Theoretical hydrogen is determined from stoichiometry after splitting converted carbon between carbon monoxide and carbon dioxide. Actual hydrogen is lower when losses, temperature shortfalls, pressure effects, or catalyst limitations reduce real performance. Comparing both values helps identify operating margin. A large gap often points to furnace duty limits, heat transfer issues, maldistribution, or conservative feed and steam settings.
This tool is best suited to front-end studies, quick case comparisons, troubleshooting discussions, and educational estimation. It does not replace rigorous equilibrium software, full heat balance models, or reactor design packages. Even so, the calculated yield, hydrogen per methane feed, and carbon conversion metrics provide a structured basis for ranking reformer cases before deeper simulation and economic evaluation.
It is the ratio of actual hydrogen output to theoretical hydrogen from the converted methane and selected carbon split. It shows how closely operation approaches stoichiometric potential.
Steam reforming is endothermic. Higher reformer temperature generally supports stronger methane conversion and better hydrogen generation, provided tube limits, catalyst stability, and furnace capacity remain acceptable.
It influences equilibrium performance and coke resistance. Too little steam can reduce conversion and raise carbon risk, while too much steam increases utility demand and thermal duty.
Yes. Enter measured actual hydrogen to compare plant data against the theoretical result. This is useful for benchmarking operating performance and spotting hidden process losses.
No. It is a screening and educational tool. Detailed design still requires rigorous reaction equilibrium, heat transfer, pressure drop, furnace, and catalyst modeling.
Feed and product flowrates are shown in kmol/h, temperature in degrees Celsius, pressure in bar, and performance indicators as dimensionless values or percentages.
The chart compares theoretical and actual hydrogen output for the current case.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.