March 2009

Process Developments

Consider practical conditions for vacuum unit modeling

A good simulation model is a tool that reveals critical operating conditions and can be applied to daily operations

Yahyaabadi, R., Esfahan Oil Refining Co.

Simulation tools are frequently applied to identify critical operating conditions. Modeling operating parameters will help ensure better unit reliability. Some operating parameters cannot be measured directly. In such cases, the parameters are calculated via a model. In a revamp case, simulation models are tools used to determine project goals. Too often, revamp projects failed due to incorrect simulations. The author discusses tips to improve simulation methods when revamping crude vacuum units. Vacuum units. Many different types of vacuum towers are used in refineries.1 The typical and most common refinery vacuum unit is shown in Fig. 1. In this vacuum unit, the feed (atmospheric residue

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