Table 2 Overview of the control loops of the superclaus process.
Controller | Controlled variable | Manipulated variable |
|---|---|---|
H2S-MOLFR | H2S concentration at the outlet of the third condenser | The ratio of the reaction furnace air to the acid gas feed rate |
FC-A1 | Flow rate of the inlet air to the reaction furnace | Flow rate of the auxiliary air to the reaction furnace |
TC-R1FEED | The inlet temperature of the first catalytic reactor | Air flow rate to the auxiliary furnace |
FC-AG2 | Flow rate of the acid gas fed to the auxiliary furnace | Opening percentage of the control valve in the acid gas inlet line to the auxiliary furnace |
TC-R2FEED | The inlet temperature of the 2nd catalytic reactor | Heat duty of the feed preheater of the 2nd catalytic reactor |
TC-super | The inlet temperature of the SuperClaus reactor | Heat duty of the feed preheater of the SuperClaus reactor |
TC4 | The outlet gas temperature from the last condenser | The heat duty of the last condenser |
FC-A4 | Inlet air flow rate to the SuperClaus reactor | Opening percentage of the control valve in the air line to the SuperClaus reactor |
E101-LC, E102-LC, E103-LC, E-104-LC | Liquid sulfur level in the condensers | Outlet flow rates of the liquid sulfur from the condensers |
