The interest in the application of numerical process simulationNumerical process simulation has constantly been growing over the last decade, also in sulfuric acidSulfuric acid and wet gas cleaning plantsWet gas cleaning plant of metallurgical production complexes. While the approval process to invest into a simulation modelModel is often lengthy, the advantages of having such modelsModel are obvious. A virtual copy of the plant or separate units thereof allows a close look onto the plant performancePerformance and how it deviates from the optimum operational windows. AnalysisAnalysis can be broken down to single equipmentEquipment or control loops to allow for detailed investigation and optimizationOptimization. In this regard, not only are standard operating conditionsOperating conditions in the focus, but also transitional or upset plant conditions. As a result, the more economic use of raw materials and utilities, as well as an increased lifetime of the equipmentEquipment is achieved. Continuous performance monitoringPerformance monitoring provides valuable data about the condition of catalysts and equipmentEquipment, allowing for realization of enhanced predictive maintenancePredictive maintenance concepts. Applying simulation modelsModel for operator trainingOperator training purposes and troubleshooting completes the list of benefits.