Accelerating convergence in dist. columns simulations

Journal Article · Mon Oct 18 04:00:00 EDT 1982 · Oil Gas J.; (United States)

OSTI ID:6060359

Pierucci, S; Biardi, G; Ranzi, E; Volpi, G

The overall problem of simulating multicomponent distillation columns is solved by partitioning the whole system of equations describing the model into three subsets. Steady state and theoretical trays are assumed. Component material balances and equilibrium equations are solved in terms of component flowrates. Bubble or dewpoint calculations are solved in terms of temperatures and new equilibrium composition profiles. Total flow material balances, enthalpy balances, and data equations are solved in terms of total flows of the Newton Raphson linearization approach proved to be stable and efficient in all cases examined. The values of the derivatives are numerically calculated. As a rule, few iterations are required to solve the system. The overall computing time for this phase is negligible when compared with the time required for the convergence of the whole mode. Other methods can be successfully applied, if necessary, in order to save computing time.

• Research Organization: Polytechnic School, Milan, Italy
• OSTI ID: 6060359
• Journal Information: Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 80:42; ISSN OIGJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ACCELERATION
COMPUTERIZED SIMULATION
CONVERGENCE
DEW POINT
DISTILLATION EQUIPMENT
ENTHALPY
EQUATIONS
EQUIPMENT
FLOW RATE
FUNCTIONS
MATERIAL BALANCE
PARTITION FUNCTIONS
PHYSICAL PROPERTIES
SIMULATION
STEADY-STATE CONDITIONS
THERMODYNAMIC PROPERTIES