CASPIAN JOURNAL

MANAGEMENT AND HIGH TECHNOLOGIES

Use of information technologies for providing automated control of the process of catalytic riforming in the conditions of uncertainty

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Dzhambekov A.M. Use of information technologies for providing automated control of the process of catalytic riforming in the conditions of uncertainty // Caspian journal : management and high technologies. — 2017. — №2. — pp. 36-46.

Dzhambekov A.M. - post-graduate student, Astrakhan State Technical University, 16 Tatishchev St., Astrakhan, 414056, Russian Federation, azamat-121@mail.ru

To support the decision-making on the management of the catalytic reforming process (CR), a generalized optimality criterion (GOC) is introduced, including the cost of producing the product and its octane number. The task of controlling the process of the CR is described, which consists in determining such control actions under which the extremum of the GOC is provided. A method for controlling the process of the CR under conditions of uncertainty has been developed. The fuzzy goal and limitations in the management of the CR process have been determined. The fuzzy goal is formulated as “The GOC should be minimal”. One of the fuzzy restrictions is formulated as “The catalyst activity should be above average”, and the other - “The condition of the reforming furnace should be better than the average”. Fuzzy goal and constraints are represented as fuzzy sets on a universal set of alternatives. As an alternative, the temperature at the exit from the furnace is used. An expression is given for determining a fuzzy solution using the Bellman - Zade scheme. On the basis of this expression, an alternative is defined, under which the membership function of the fuzzy solution reaches its maximum. For the obtained alternative, with the use of a hybrid mathematical model of the CR process, the control actions that ensure the extremum of the GOC are determined. The software is developed that implements the method of controlling the process of the CR in conditions of uncertainty on the computer. For support of the interface with the user the software contains a row of tabs. The “Initial data” tab is required to fill the values of the dependence of the GOC on the temperature at the exit from the furnace, and also to specify the membership functions of the term sets of the linguistic variables “Catalyst activity”, “Furnace status”. The “Definition of fuzzy solution” tab is used to set a fuzzy goal and fuzzy constraints with the given term sets in the “Input data” tab. The “Definition of fuzzy solution” tab is necessary for plotting the fuzzy solution membership functions and determining the alternative corresponding to the maximum of this membership function. The “Definition of the control vector” tab is used to determine the control actions corresponding to the extremum of the GOC.

Key words: каталитический риформинг, обобщенный критерий оптимальности, нечеткая цель, нечеткое ограничение, активность катализатора, состояние печи риформинга, температура на выходе из печи риформинга, универсальное множество альтернатив, функция принадлежности, ли