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Hierarchical Control of Chemical Reactors

#A-544


Optimal Hierarchical Control of Section Reactor Group

Tech Area / Field

  • MAN-COM/CAD and CAM/Manufacturing Technology
  • CHE-IND/Industrial Chemistry and Chemical Process Engineering/Chemistry

Status
8 Project completed

Registration date
26.05.2000

Completion date
10.10.2006

Senior Project Manager
Libby M D

Leading Institute
Engineering Academy of Armenia, Armenia, Yerevan

Collaborators

  • Credigroup Co., USA, CA, Sunnyvale

Project summary

The goal of the project is modeling and optimization of a very extensively spread technological process, such as a process of dimethyloxide decomposition to isoprene. This process presents the source for obtaining caoutchouc, without which tyre manufacturing industry of any developed country can sustain (about 60-80% of tyre is mod from isoprene caoutchouc). The process is implemented both in the manufacture of average with the annual capacity of production at least 100.000 tons and large tonnage with the annual capacity 1.000.000 tons. Any raise of goal product isoprene productivity leads to essential economic effect, necessary for industry. This makes ground for the fact that isoprene production in the world is implemented on section reactors, which allow obtaining the highest possible capacity from a unit of equipment.
The most difficult is the modeling and optimization of chemico-technological processes, the base of which are the group of gas-solid sectioned reactors because of the large extent of freedom. For adequate modeling of the operation of the group of gas-solid sectioned reactors it is necessary to express in mathematical model the whole extent of freedom inherent to the object while from the point of management view the large extent of freedom does not allow to use in the task of management such traditional methods as dynamic programming, calculus of variation, linear and non-linear programming and etc.
The complexity of management of the group of gas-solid sectioned reactors consists in the fact that under the optimal management of these systems in the regime of purposeful functioning and regeneration the whole system works entirely not optimally and, besides, the both regimes of working are interconnected and impact each other, that is, the results of system's working in the regime of purposeful functioning influence both the results of the system in the regime of regeneration and the results of the system's working in the whole during the small cycle.
If one formulates the task of management of the group of gas-solid sectioned reactors as one task of optimal management of the system in the whole, but taking into consideration also the management of separate regimes in the same criteria of management, that is, the task, the solving to which would give an answer to the question how to manage the both regimes together and also every regime separately then the time of solving this problem would be unacceptable or the taken decision would be out of date let alone that similar industrial systems must be managed in the scope of real time. For management of the similar systems it is being offered to use two- and three-level hierarchical systems of management on the base of methods of the theory of game with unantagonistic interests and information theory of hierarchical systems.
The task of management of one sectioned reactor is being formulated as hierarchical system of management between Center and two Producers. Such statement of management allows to find an optimal management in the regime of real time.
The project's products are the following programs:
1. The program of mathematical model of gas-solid sectioned reactor in the regime of purposeful functioning.
2. The program of mathematical model of gas-solid sectioned reactor in the regime of regeneration.
3. The program of identification of coefficients of mathematical model of gas-solid sectioned reactor in the regime of purposeful functioning.
4. The program of identification of coefficients of mathematical model of gas-solid sectioned reactor in the regime of regeneration.
5. The program of optimal management of gas-solid sectioned reactor in the regime of purposeful functioning.
6. The program of optimal management of gas-solid sectioned reactor in the regime of regeneration.
7. The program of mathematical model of gas-solid sectioned reactor in small cycle.
8. The program of identification of coefficients of mathematical model of gas-solid sectioned reactor working in small cycle.
9. The program of optimal management of gas- solid sectioned reactor in small cycle.
10. The program of mathematical model of gas-solid sectioned reactors' group.
11. The program of identification of coefficients of mathematical model of gas-solid sectioned reactors' group.
12. The program of optimal management of gas-solid sectioned reactors' group in the regime of decomposition.
The program of optimal management of gas-solid sectioned reactors' group may be used by enterprises and firms, which have in their technological chain the group of sectioned reactors, in particular, chemical enterprises producing isoprene.
Two-leveled optimal management enables to increase the productivity of one reactor in terms of isoprene by 4-6%, three-leveled management the group of reactors up to 12-15% in terms of isoprene, which for enterprises with average capacity 100 000-200 000 tones of isoprene per year gives the additional profit about &US 240 000-600 000 without capital investment from one enterprise (if we take the international price for isoprene $200/per ton, although prices are different in different countries and in the main the price is above mentioned).
This project pursues both scientific-technical and commercial goals. The first of these goals is realization of control for the process of dimethyloxide decomposition to isoprene under optimal regime, implemented on a group of section. The commercial goal is expressed in further sale of software package for the process control to leading firms of developed countries.


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