Catalytic reforming 17 lump reaction model modelling approach

Abstract

The invention discloses a catalytic reforming 17 lump reaction model modelling approach characterized in that, (1) the reaction feedstock is divided into 17 lumped components, (2) recapitalization reaction network containing 17 reactions is included, (3) method for determining model parameter is provided, (4) continuance reforming catalyst coke and deactivation model is created, (5) differentiated accurate one-dimensional searching algorithm is introduced into the classical BFGS alogorithm, which is a parameter estimation.

Description

technical field [0001] The invention relates to a modeling method of 17 lumped reaction models of catalytic reforming. Background technique [0002] The catalytic reforming unit is one of the important secondary processing units in the petroleum processing process, and it is also one of the complex catalytic reaction systems. The chemical reactions that occur in the reforming process mainly include five types of reactions: naphthene dehydrogenation, isomerization, alkane dehydrocyclization, aromatics hydrogenolysis, and alkane hydrocracking. The reforming feed is generally refined naphtha (mainly C 6 ~C 11 Alkanes, cycloalkanes and aromatics), there are nearly 300 kinds of pure components, and the reactions are countless. The reforming unit can not only produce high-octane gasoline, but also provide a large amount of aromatics as important chemical raw materials. It is an indispensable and important production unit for modern refineries and petrochemical plants, and it is...

AI Technical Summary

Problems solved by technology

For example, Smith’s 4-lumped model has too few lumped divisions, ignoring the difference in reactivity between hydrocarbon components with different carbon numbers, and the model accuracy is not high

Other reaction models not only distinguish hydrocarbon components with different carbon numbers, but also distinguish normal isoparaffins or five-membered and six-membered cycloalkanes. The lumped division is too complicated

At present, most reforming unit laboratories in China have limited analysis conditions, and generally only analyze C in reforming feedstock oil or product oil. 1 ~C 9+ The group composition of alkanes, cycloalkanes, and aromatics cannot meet the analysis requirements of the model, which brings difficulties to the industrial application of the model

[0008] 2. The model is too complex and parameter estimation is difficult

Especially since the 1990s, most of the models developed since the 1990s have more than 20 lumps, even reaching 64. The consequences are that the number of responses increases sharply, the dimensionality of model equations and parameter variables to be estimated is too high, and parameter estimation algorithms are difficult. convergence

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