Method for obtaining number of tower plates of distillation tower based on Gilliland association formula

Abstract

The invention discloses a method for obtaining the number of distillation tower plates based on a Gilliland association formula, and the method comprises the steps: (1) obtaining a plurality of distillation tower design schemes from a Gilliland association graph, and obtaining a plurality of distillation reflux ratios and the corresponding number of distillation tower plates; (2) establishing a power model by taking the distillation reflux ratio as an independent variable and the number of tower plates of the distillation tower as a dependent variable; (3) encoding the established power modelinto a fitting model, substituting the data obtained in the step (1) into the fitting model, and solving the fitting model by using an adaptive random simplified particle swarm optimization algorithmto obtain a Gilliland association formula most associated with the Gilliland association graph; and (4) substituting the distillation reflux ratio required in the chemical distillation production intothe Gilliland association formula, calculating to obtain the number of tower plates which most meet the current production requirement, and designing a distillation tower according to the number of tower plates to perform distillation work. According to the invention, the accurate number of distillation tower plates can be obtained for distillation work, the stability is high, and the treatment speed is high.

Description

technical field [0001] The invention relates to a method for designing a distillation column, in particular to a method for obtaining the plate number of a distillation column based on the Gilliland correlation formula. Background technique [0002] In chemical production, distillation is often used to separate liquid mixtures. According to its method, it can be divided into: simple distillation, balanced distillation, rectification, and special rectification. Before distillation, one of the more important tasks is to design the distillation column. How to accurately configure the number of plates in the distillation column is an important factor in determining the purity of the substance after distillation. At present, the more commonly used method is to design the distillation column according to the Gilliland correlation diagram, and the relevant data will be stored in the manual in the form of a list or directly in the form of a correlation diagram for query. However, w...

AI Technical Summary

Problems solved by technology

At present, the most commonly used methods are mainly classical mathematical calculation methods, such as: least square method, Powell method, Newton method, etc. These methods have relatively stable performance, but their shortcomings are also very obvious

Disadvantage 1: It is necessary to set the initial value, calculate the gradient, etc. during the fitting, and the preparation work is complicated, and has a great impact on the result; Disadvantage 2: For the convenience of calculation, the prediction formula needs to be simplified, such as taking the exponent on both sides of the equation as The logarithmic function of the bottom, which has higher requirements on the prediction function, and the use of an oversimplified prediction function for the convenience of calculation will affect the fitting accuracy

Although the basic particle swarm optimization method has many advantages, its low convergence accuracy, slow convergence speed in the later period, and rapid weakening of stability as the problem dimension increases are the fatal reasons why it is difficult to use in complex situations.

Images