scholarly journals DEPENDENCE OF EXTERNAL AND INTERNAL ENERGY-SAVING FOR RECTIFICATION OF BINARY MIXTURES

2016 ◽  
Vol 11 (1) ◽  
pp. 40-44 ◽  
Author(s):  
M. K. Zakharov ◽  
A. A. Shvets
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Internal Energy ◽  
Binary Mixtures ◽  
Heat Energy ◽  
Vapor Flow ◽  
Flow Energy ◽  
Fold Reduction ◽  
Internal Energy Saving

The comparison of energy consumption for rectification of binary mixtures in one-column and twocolumn apparatuses was carried out with the use of vapor flow energy from the first column for heating the second column. It is shown that the expected two-fold reduction of the flow of heat energy is impossible due to the decrease of the internal energy-saving.

scholarly journals Liquid mixtures separation and heat consumption in the process of distillation

2021 ◽  
Vol 16 (1) ◽  
pp. 7-15
Author(s):  
M. K. Zakharov ◽  
A. V. Egorov ◽  
A. A. Podmetenny
Keyword(s):  
Mathematical Models ◽  
Energy Saving ◽  
Internal Energy ◽  
Initial Mixture ◽  
Liquid Mixtures ◽  
Heat Consumption ◽  
Reflux Ratio ◽  
Component Distribution ◽  
Study Results ◽  
Internal Energy Saving

Objectives. The aim of this study is to investigate different distillation modes of a binary ideal mixture and determine how various factors affect heat consumption in the column boilers. In addition, it intends to assess the difficulty of separating mixtures. Our research is based on analyzing the characteristics of vapor-liquid equilibrium.Methods. To conduct our study, we used a graphic-analytical tool to calculate the distillation process of a binary mixture and mathematical models based on the Aspen Plus software package along with DSTWU, RadFrac, and the Sensitivity module. We also used the Peng-Robinson equation (PENG-ROB) to determine the liquid-vapor equilibrium.Results. We employed the graphical method and mathematical models to obtain the operation parameters of two column variants for the distillation of binary ideal benzene-toluene mixtures. In each variant the initial mixture contained the same amount of the low- and high-boiling component. The number of plates in the column sections, reflux ratio, energy consumption, and indicators of internal energy saving were determined.Conclusions. Study results show that using the coefficient of the component distribution between the vapor and liquid phases is a promising method for preliminary assessments of the separation difficulty and measurements of the expected heat consumption in the boilers of columns. Comparison studies showed that the heat consumption in the boiler decreases as the internal energy saving in the columns increases.

scholarly journals COMPARISON OF ENERGY SAVING METHODS FOR DISTILLATION OF LIQUID MIXTURES

2020 ◽  
Vol 64 (1) ◽  
pp. 85-92
Author(s):  
Mikhail K. Zakharov ◽  
Yuri A. Pisarenko ◽  
Oksana I. Sycheva
Keyword(s):  
Energy Saving ◽  
Internal Energy ◽  
Heat Pump ◽  
Distillation Column ◽  
Scientific Literature ◽  
Heat Removal ◽  
Heat Consumption ◽  
Heat Integration ◽  
Additional Increase ◽  
Internal Energy Saving

The analysis and review of the scientific literature on methods and approaches to energy saving in distillation, as one of the most energy-intensive processes for the separation of binary and multicomponent mixtures was carried out. Directions of the scientific literature are highlighted, showing the relevance of the thermodynamic method assessment of separation processes. A comparative analysis of various methods of energy conservation in the separation of liquid binary mixtures by the distillation method is performed (a binary mixture of benzene-toluene was chosen as an example). A conventional distillation column as well as a column with a heat pump and a column with heat integration were considered. As a result of the calculation experiment for each option performed using the Aspen Plus software package the optimal column parameters were determined - the total number of stages and the position of feed stage. The heat consumption in the column boiler was taken as the objective function. It is also shown that with the same characteristics of the columns, the best way to organize the process for separating the selected mixture is to compress the steam stream from rectifying profile of the column with its subsequent use in the boiler of the stripping profile according to the principle of a heat pump. It was established by a calculation experiment that heat integration by compressing steam from rectifying profile of the column and supplying it to the stripping profile gives significantly less energy saving. The calculation of internal energy saving by distillation column was carried out and it was shown that the distributed heat removal from the plates of the rectifying profile of the column and the supply of this heat to the stripping profile plates reduces internal energy saving and leads to an additional increase in heat consumption in the boiler.

scholarly journals THEORETICAL RATIONALE FOR THE SELECTION OF THE OPTIMAL SCHEME OF SEPARATION OF THE THREE-COMPONENT MIXTURE

2017 ◽  
Vol 12 (4) ◽  
pp. 43-49 ◽  
Author(s):  
M. K. Zakharov ◽  
Yu. A. Pisarenko
Keyword(s):  
Energy Saving ◽  
Internal Energy ◽  
Software Package ◽  
Aspen Plus ◽  
Theoretical Justification ◽  
Component Mixture ◽  
Theoretical Rationale ◽  
Internal Energy Saving ◽  
High Boiling Component ◽  
Selection Of

It is theoretically justified that for the scheme of separation of three-component mixtures with the release of the high-boiling component in the first column there is a region of initial compositions for which the heat costs are the least. An expression describing the boundary of the optimality regions of different separation schemes is given. The calculation of the heat costs for both rectification schemes of the three-component mixtures performed using the Aspen Plus software package confirmed the theoretical justification for the existence of optimality regions for each of them. With the help of the concept of internal energy saving, the advantage of one or another scheme of separation of a three-component mixture is explained.

scholarly journals INTERNAL ENERGY SAVING IN DISTILLATION COLUMNS WITH REAL PLATES AND IN FILLED DISTILLATION COLUMNS

2017 ◽  
Vol 12 (2) ◽  
pp. 42-49
Author(s):  
М. К. Zakharov ◽  
N. V. Lobanov
Keyword(s):  
Mass Transfer ◽  
Energy Saving ◽  
Heat And Mass Transfer ◽  
Internal Energy ◽  
Power Saving ◽  
Theoretical Plate ◽  
Continuous Phase ◽  
Distillation Columns ◽  
Internal Energy Saving ◽  
Theoretical Plates

Perspective ways of power saving in the distillation of liquid mixtures are considered. The phenomenon of internal energy saving on theoretical plates is considered in detail. As shown in this article, the phenomenon depends on the number of theoretical plates in the rectifying and stripping sections of the column and also on the aggregative state of the feed mixture. The processes of heat and mass transfer on real plates with various values of efficiency factor are considered. Blocks of real plates equivalent to one theoretical stage, that is, blocks where the leaving flows of the liquid and vapor are in equilibrium, are isolated. Analogically, heat and mass transfer in apparatuses with a continuous phase contact having a layer height providing one theoretical plate is considered. It is proved that internal energy saving in filled rectifying columns with real plates also depends on the number of theoretical plates and the aggregative state of the initial mixture.

scholarly journals Three-stage method of forecasting energy consumption levels in the economy with regard for regional energy saving potentials

2020 ◽  
Vol 2020 (3) ◽  
pp. 37-45
Author(s):  
N.Yu. Maistrenko ◽  
◽  
O.Ye. Malyarenko ◽  
V.V. Horskyi ◽  
◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Economic Activity ◽  
Heat Energy ◽  
Energy Resources ◽  
Total Energy Consumption ◽  
Vector Method ◽  
Regional Energy ◽  
Country Level ◽  
Hierarchical Levels

We perfected the known two-stage method of forecasting energy consumption levels by applying its methodical approaches for three hierarchical levels of the structure of Ukrainian economy: country, regions, types of economic activity in regions. This approach makes it possible to determine the demand for fuel and energy resources at the regional levels of structuring the economy with regard for the specific features of their economic development. According to regional energy efficiency programs, it is possible to estimate more accurately the energy saving potentials and volumes of the replacement of scarce fuels with their cheap local types. The three-stage method is based on the refined normative method that is used at three hierarchical levels with regard for the estimated energy saving potentials from structural and technological shifts in the economy. The forecasts obtained agree with each other by Kulyk's method twice. The country-level forecast is consistent with the forecast for total regional energy consumption. For each region, the forecast of regional energy consumption is consistent with the forecast of total energy consumption at the levels of types of economic activity in the region with regard for structural and technological shifts. If the coordination of consumption levels between the types of economic activity and the region will introduce corrections to the regional energy consumption, then the coordination of levels of the country and regions is carried out at the second time. In other words, forecasting is carried out at three levels with two matches of the results of forecasting energy consumption –- between the first and second as well as second and third levels. If it is necessary to correct the forecasts of second level, reconciliation between the forecasts of first and second levels is performed again. Kulyk's vector method is used to agree on predictive decisions. We also present a method for calculating the forecasts of energy consumption at three hierarchical levels with the corresponding agreement of these forecasts. Based on the described methodology and estimated volumes of energy saving potentials at regional levels and for more significant types of economic activity in the regions, we performed a forecast of heat energy consumption for the period to 2040 , taking into account the volumes of technological energy saving in the regions. Keywords: method, demand, region, energy consumption, forecasting, type of economic activity, adjustment

scholarly journals SELECTING THE OPTIMUM SCHEME OF THE SEPARATION OF HYDROCARBON GASES BY DISTILLATION

2018 ◽  
Vol 13 (3) ◽  
pp. 23-29
Author(s):  
M. K. Zakharov ◽  
A. A. Boychuk
Keyword(s):  
Energy Saving ◽  
Internal Energy ◽  
Distillation Column ◽  
Hydrocarbon Gases ◽  
Component Mixture ◽  
Distillation Columns ◽  
Column System ◽  
Component Selection ◽  
Internal Energy Saving ◽  
Average Internal Energy

The heat costs in distillation columns were determined for the purpose of separating a four-component gas mixture in gas fractionators with various component selection sequences. A method for selecting the optimal scheme was developed. It is based on the concept of “internal energy saving” upon rectification. Internal energy saving means multiple steam operation on the plates of a distillation column, namely, its condensation on each plate with the release of the heat of condensation, which is used for the evaporation of the liquid entering the plate to obtain a new steam composition. It was shown that when binary and three-component mixtures are separated and products of equal purity are obtained, the heat costs are related to the internal energy saving. The calculation of the internal energy saving in a three-column system for the separation of a four-component mixture was carried out. The calculation confirms that, as the internal energy saving increases and, accordingly, the average internal energy saving in the system of columns increases, the total heat consumption is reduced. The results of calculating three separation schemes of the four-component mixture were compared using the program Aspen Plus with different methods for describing the phase equilibrium (NRTL, Peng-Robinson, Chao-Seader) was carried out. It was shown that the calculations with the use of Peng-Robinson and Chao-Seader methods match.

SMART NETWORKS FOR DIGITALIZATION OF URBAN ECONOMY WITHIN THE FRAMEWORK OF THE “SMART CITY”

2020 ◽  
Vol 3 (8) ◽  
pp. 21-27
Author(s):  
S. V. PROKOPCHINA ◽  
Keyword(s):  
Energy Consumption ◽  
Internal Energy ◽  
Energy Management ◽  
Energy Security ◽  
Smart City ◽  
Urban Economy ◽  
Training Center ◽  
Energy Audit ◽  
Intelligent Networks ◽  
Industrial Energy

The article deals with methodological and practical issues of building Bayesian intelligent networks (BIS) for digitalization of urban economy based on the principles of the “Smart city” concept. The BIS complex as a whole corresponds to the architecture of urban household management complexes for construction and industrial energy purposes for solving the problems of internal energy audit, accounting for energy consumption, ensuring energy security of enterprises and territories, in Addition, the system can become the basis for the implementation of a training center for energy management and housing.

The Research of Measuring Approach and Energy Efficiency for Hadoop Periodic Jobs

2015 ◽  
Vol 8 (1) ◽  
pp. 206-210 ◽  
Author(s):  
Yu Junyang ◽  
Hu Zhigang ◽  
Han Yuanyuan
Keyword(s):  
Energy Efficiency ◽  
Cloud Computing ◽  
Energy Consumption ◽  
Energy Saving ◽  
Energy Estimate ◽  
Cloud Platform ◽  
Periodic Tasks ◽  
Current Consumption ◽  
Reduce Energy Consumption

Current consumption of cloud computing has attracted more and more attention of scholars. The research on Hadoop as a cloud platform and its energy consumption has also received considerable attention from scholars. This paper presents a method to measure the energy consumption of jobs that run on Hadoop, and this method is used to measure the effectiveness of the implementation of periodic tasks on the platform of Hadoop. Combining with the current mainstream of energy estimate formula to conduct further analysis, this paper has reached a conclusion as how to reduce energy consumption of Hadoop by adjusting the split size or using appropriate size of workers (servers). Finally, experiments show the effectiveness of these methods as being energy-saving strategies and verify the feasibility of the methods for the measurement of periodic tasks at the same time.

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