Claus sulfur recovery (SRU) simulation

acid gas -> tail gas + liquid sulfur (staged Claus conversion)

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Governing equations

The exact equations the solver works for a claus sulfur recovery (sru) — the same math shown in the app's "Theory" panel, not a black box.

\mathrm{H_2S} + \tfrac{3}{2}\mathrm{O_2} \rightarrow \mathrm{SO_2} + \mathrm{H_2O}

2\,\mathrm{H_2S} + \mathrm{SO_2} \rightarrow 3\,\mathrm{S} + 2\,\mathrm{H_2O}

\frac{\dot n_{\mathrm{H_2S}}}{\dot n_{\mathrm{SO_2}}} = \frac{1-\phi}{\phi}

R_{max} = \min\left(3\phi,\; \tfrac{3}{2}(1-\phi)\right)

X = 1 - (1-X_{th})\prod_i (1-X_i)

R = R_{max}\,X

$\phi$: fraction of feed H2S burned to SO2 in the reaction furnace
$R_{max}$: stoichiometric ceiling on sulfur recovery [0..1]
$R$: overall sulfur recovery [0..1]
$X$: overall conversion of the convertible sulfur
$X_{th}$: thermal-stage conversion
$X_i$: catalytic stage i conversion
$\dot n$: component molar flow [mol/s]
$i$: catalytic stage index

Parameters

combustion_fraction (of feed H2S burned to SO2; 1/3 gives the 2:1 ratio), thermal_conversion, catalytic_conversions [per-stage fraction of the remaining convertible sulfur], h2s/so2/water/sulfur component names, temperature [K], pressure_drop [Pa]

Example flowsheets that use it

Claus sulfur recovery unit (SRU): the 2:1 ratio that sets the ceiling

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Claus sulfur recovery (SRU) simulation

Governing equations

Parameters

Example flowsheets that use it

Claus sulfur recovery unit (SRU): the 2:1 ratio that sets the ceiling

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