OPTIMAL FUZZY CONTROL TO OPTIMISE ENERGY CONSUMPTION IN DISTILLATION COLUMNS

Designed a device with PLC and inverter for transformer cooling control system. The structure of fuzzy controller is built with PLC. By calculating and testing, fuzzy and fuzzy control rules are established. Practical computing for the PLC to control the output lookup table is given. Using this technique, transformer cooling system energy consumption will be reduced, transformer’s coolers life will be extended and transformer cooling system automation level will be increased.

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Optimization of Hybrid Energy Storage System Control Strategy for Pure Electric Vehicle Based on Typical Driving Cycle

Mathematical Problems in Engineering ◽

10.1155/2020/1365195 ◽

2020 ◽

Vol 2020 ◽

pp. 1-12

Author(s):

Kanglong Ye ◽

Peiqing Li ◽

Hao Li

Keyword(s):

Energy Consumption ◽

Energy Storage ◽

Fuzzy Control ◽

Control Strategy ◽

Storage System ◽

Energy Storage System ◽

Hybrid Energy ◽

Hybrid Energy Storage ◽

Hybrid Energy Storage System ◽

Fuzzy Control Strategy

Taking a hybrid energy storage system (HESS) composed of a battery and an ultracapacitor as the study object, this paper studies the energy management strategy (EMS) and optimization method of the hybrid energy storage system in the energy management and control strategy of a pure electric vehicle (EV) for typical driving cycles. The structure and component model of the HESS are constructed. According to the fuzzy control strategy, aimed at the roughness of the membership function in EMS, optimization strategies based on a genetic algorithm (GA) and particle swarm optimization (PSO) are proposed; these use energy consumption as their optimal objective function. Based on the improved EV model, the fuzzy control strategy is studied in MATLAB/Advisor, and two control strategies are obtained. Compared with the simulation results based on three driving cycles, urban dynamometer driving schedule (UDDS), new European driving cycle (NEDC), and ChinaCity, the optimum control strategy were obtained. The theoretical minimum energy consumption of HESS was reached by dynamic programming (DP) algorithm in the same simulation environment. The research shows that, compared with the PSO, the output current peak and current fluctuation of the battery optimized by the GA are lower and more stable, and the total energy consumption is reduced by 3–9% in various simulation case studies. Compared with the theoretical minimum value, the deviation of energy consumption simulated by GA-Fuzzy Control is 0.6%.

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Fuzzy Control System for Smart Energy Management in Residential Buildings Based on Environmental Data

Energies ◽

10.3390/en14030752 ◽

2021 ◽

Vol 14 (3) ◽

pp. 752

Author(s):

Dimitrios Kontogiannis ◽

Dimitrios Bargiotas ◽

Aspassia Daskalopulu

Keyword(s):

Control System ◽

Energy Consumption ◽

Decision Tree ◽

Fuzzy Control ◽

Residential Buildings ◽

Environmental Data ◽

Weather Data ◽

Series Data ◽

Rule Base ◽

Fuzzy Control System

Modern energy automation solutions and demand response applications rely on load profiles to monitor and manage electricity consumption effectively. The introduction of smart control systems capable of handling additional fuzzy parameters, such as weather data, through machine learning methods, offers valuable insights in an attempt to adjust consumer behavior optimally. Following recent advances in the field of fuzzy control, this study presents the design and implementation of a fuzzy control system that processes environmental data in order to recommend minimum energy consumption values for a residential building. This system follows the forward chaining Mamdani approach and uses decision tree linearization for rule generation. Additionally, a hybrid feature selector is implemented based on XGBoost and decision tree metrics for feature importance. The proposed structure discovers and generates a small set of fuzzy rules that highlights the energy consumption behavior of the building based on time-series data of past operation. The response of the fuzzy system based on sample input data is presented, and the evaluation of its performance shows that the rule base generation is derived with improved accuracy. In addition, an overall smaller set of rules is generated, and the computation is faster compared to the baseline decision tree configuration.

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Complex Systems of Distillation Columns Used in the Production of the Propylene Oxide

Revista de Chimie ◽

10.37358/rc.17.1.5382 ◽

2017 ◽

Vol 68 (1) ◽

pp. 28-34

Author(s):

Marilena Nicolae

Keyword(s):

Energy Consumption ◽

Complex Systems ◽

Propylene Oxide ◽

Distillation Column ◽

Multicomponent Mixture ◽

Heat Integration ◽

Distillation Columns ◽

Simplified Method ◽

Petlyuk Column ◽

Best Fitting

Complex systems of distillation columns were intensively studied within last decades and continue to show interest for researchers and for industrial application. The first designed complex distillation column with heat integration was the Petlyuk column and the development of complex systems of columns continued up to dividing wall columns (DWC) which are increasingly being used in industry. DWC are usually used to separate three products, components or fractions, from a multicomponent mixture. This study attempts to find the best fitting of complex systems of columns in the process of propylene oxide (PO) obtaining using the method of propylene chlorination and presents a proposed variant of separation which can lead to a reduced energy consumption. The fabrication of PO through this method lead to a multicomponent mixture which is separated in two main products: propylene oxide (PO) and heavier components containing as valuable compound 1,2 dichloropropane (DCP). Both products, PO and DCP, have important uses in the chemical industry. The study of complex schemes of columns used for PO separation was assessed by simulation using a simplified method based on Fenske � Underwood - Gilliland correlation (F.U.G.) [1]. The systems studied in this work include the following configurations of columns: column with prefractionator, column with partially coupled prefractionator, the Petlyuk column, the dividing wall column, column with side striper, column with side rectifier, the direct and the indirect sequence.

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Dynamic Behaviour of Thermally Coupled Distillation Arrangements: Effect of the Interconnection Flowrate

Chemical Product and Process Modeling ◽

10.2202/1934-2659.1152 ◽

2008 ◽

Vol 3 (1) ◽

Author(s):

Erick Yair Miranda-Galindo ◽

Juan Gabriel Segovia - Hernández

Keyword(s):

Energy Consumption ◽

Energy Savings ◽

Complex Structure ◽

Minimum Energy ◽

Control Analysis ◽

Thermally Coupled Distillation ◽

Distillation Columns ◽

Minimum Energy Consumption ◽

Coupled Structures ◽

Value Decomposition

Thermally coupled distillation sequences can provide significant energy savings with respect to the operation of conventional distillation columns. Coupled sequences exhibit a complex structure, with recycle streams, that appear to affect their controllability properties. One potential solution to this problem has been suggested through the operation of complex schemes under conditions that do not provide minimum energy consumption. The basic idea is that if one changes the value of the interconnection flowrate, the control properties might change as well. In this work, we analyze the dynamic behavior of two coupled structures under different operating points, including the one with minimum energy consumption. The control analysis properties are analyzed with the application of the singular value decomposition technique in all frequency domains. The results show that the controllability properties of distillation sequences may change significantly depending on the selected value of interconnection flowrate.

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The effects of fuzzy control of magnetic flux on magnetic filter performance and energy consumption

Expert Systems with Applications ◽

10.1016/j.eswa.2010.04.090 ◽

2010 ◽

Vol 37 (12) ◽

pp. 7542-7551 ◽

Cited By ~ 1

Author(s):

Ismail Saritas ◽

Ilker Ali Ozkan ◽

Saadetdin Herdem

Keyword(s):

Energy Consumption ◽

Magnetic Flux ◽

Fuzzy Control ◽

Filter Performance ◽

Magnetic Filter

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SELECTION OF EXTRACTIVE AGENTS FOR THE SEPARATION OF CHLOROFORM - METHANOL - TETRAHYDROFURAN MIXTURE

Тонкие химические технологии ◽

10.32362/24106593-2018-13-3-30-40 ◽

2018 ◽

Vol 13 (3) ◽

pp. 30-40 ◽

Cited By ~ 1

Author(s):

V. M. Raeva ◽

D. I. Sukhov

Keyword(s):

Energy Consumption ◽

Extractive Distillation ◽

Industrial Test ◽

Ideal Behavior ◽

Component Mixture ◽

Distillation Columns ◽

Boiling Points ◽

Derivative System ◽

Separating Agents ◽

Chloroform Methanol

Variants of the extractive distillation of chloroform - methanol - tetrahydrofuran equimolar mixture with industrial separating agents are considered. The basic system shows opposite deviations from the ideal behavior, because it contains binary azeotropes with minimum and maximum boiling points (3.3.1-4 system according to Serafimov’s classification). The choice of selective substances for extractive distillation was carried out taking into account the concentration dependences of the excess molar Gibbs energy of the binary constituents of the derivative system “chloroform - methanol - tetrahydrofuran - industrial test agent (ethylene glycol (EG), dimethyl sulfoxide (DMSO), N-methylpyrrolidone (N-MP))” at 101.32 kPa. Based on the results of the evaluation of the thermodynamic criterion, DMSO and N-MP are recommended. Both agents show selective effect when separating two binary constituents. EG is selective only with respect to chloroform-tetrahydrofuran mixture. Since the tested agents show different selective effects, the final agent choice determines the qualitative composition of the product flows in the column for the extractive distillation of the three-component mixture (the first column of the flowsheet) and, accordingly, the structure of the total flowsheet. The schemes consist of two two-column complexes for extractive distillation (for the basic three-component mixture and for the binary mixture). The maximum contribution to the total reboiler energy consumption of the distillation columns is made by the first extractive distillation column: 65% (EG), 53% (N-MP) and 24% (DMSO). The use of the most selective agent reduces the energy consumption of this column: the reboiler load is maximal in the case of EG, in comparison with which the load is 47% lower in the case of N-MP and 76% lower in the case of DMSO.

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SYNTHESIS OF FLOWSHEETS FOR SEPARATION OF MULTIPHASE MIXTURES: STATE OF THE ART

Тонкие химические технологии ◽

10.32362/24106593-2018-13-3-5-22 ◽

2018 ◽

Vol 13 (3) ◽

pp. 5-22 ◽

Cited By ~ 2

Author(s):

A. V. Frolkova ◽

A. D. Merkulyeva ◽

I. S. Gaganov

Keyword(s):

Phase Separation ◽

Energy Consumption ◽

Butyl Acetate ◽

Ternary Systems ◽

Ternary Mixtures ◽

Reflux Ratio ◽

Total Energy Consumption ◽

Separation Processes ◽

Distillation Columns ◽

Analytical Review

The paper presents an analysis of the current state of research on separation flowsheets based on the combination of distillation and phase separation processes, as well as heteroazeotropic distillation. It is shown that the works of foreign researchers devoted to the study of flowhseets with decanters are more focused on finding ways to reduce energy consumption by introducing additional separators, a combination of several methods (extractive and heteroazeotropic complex columns with external decanters. The task of synthesizing all possible separation flowsheets is not considered in these works. In this paper, a complete set of flowsheets of different structures based on the combination of distillation and phase separation processes, including the use of columns with an external decanter, is proposed for water - butyl acetate - methanol and methanol - heptane-water ternary mixtures separation. Aspen Plus and NRTL model were used for mathematical modelling of phase equilibrium (the relative error of describing liquid-vapor and liquid-liquid equilibrium is less than 5%) was chosen as a method of research. Operating parameters for distillation columns (the number of theoretical plates, feed plate, reflux ratio) and the total energy consumption were obtained for each case. The necessity of using a double feed-plate column for separating of propanol-1 - water - butanol-1 and ethyl acetate - water - butyl acetate ternary systems was explained by the presence of extractive effect. Analytical review of modern publications and results of own research allowed to formulate a number of recommendations for the synthesis of energy effective flowsheets based on a combination of distillation and phase separation processes.

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