Theoretical Foundations of Chemical Engineering最新文献

{"title":"Integration of Turboexpanders into Reactor Blocks of the Dehydrogenation of Processes of Light Alkanes","authors":"A. V. Utemov,&nbsp;A. N. Matveeva,&nbsp;E. V. Sladkovskaya,&nbsp;D. Yu. Murzin,&nbsp;D. A. Sladkovskii","doi":"10.1134/S004057952560069X","DOIUrl":"10.1134/S004057952560069X","url":null,"abstract":"<p>An analysis of the efficiency of new schemes for integrating turboexpanders into systems for heating gas feedstock mixtures of various light alkanes dehydrogenation processes is performed. Theoretical calculations of the energy consumption of the considered schemes are performed. Thus, in the energy-technology scheme it is necessary to increase the thermal load, while almost all the added thermal energy is converted into electrical energy, which characterizes the proposed schemes as a highly efficient method of producing electricity from the heat generated directly in the petrochemical plant. The combined scheme is optimized and a technical and economic analysis is performed. The compositions of the feedstock flows of the most common industrial processes of dehydrogenation of light alkanes are considered as potential working fluids for the combined power-generation process.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1619 - 1629"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Droplet Size Distribution of the Liquid Phase in a Vortex Separation Device","authors":"O. S. Dmitrieva,&nbsp;V. V. Kharkov,&nbsp;A. N. Nikolaev","doi":"10.1134/S0040579525601165","DOIUrl":"10.1134/S0040579525601165","url":null,"abstract":"<p>The vortex form of multiphase flows is often organized in installations used in the electric power industry, the petroleum and chemical industries, and nuclear energy. Separators of various designs are used to separate gas-liquid flows. Predicting the composition of the dispersed phase is essential for the proper design, operation, and optimization of two-phase flow systems, because a parameter such as the efficiency of the separator strongly depends on the operating mode and the nature of droplet breakup. The dynamics of the gas–liquid flow under swirling conditions has been studied and is of great interest, and there are several mathematical models of droplet breakup. The analysis of the factors influencing the separation characteristics of the device depending on the characteristic zones of the droplet layer is carried out. On this basis, an experimental setup is uses to determine the size distribution of liquid droplets at the inlet to the vortex separation device with a change in the average velocity of the gas through the device from 15 to 23 m/s and a liquid phase rate of 150 kg/h. The electrical contact method is utilized in the study using a special two-needle probe with replaceable contact heads. In this work, experimental confirmation of the validity of using a logarithmic normal distribution is obtained to describe the dispersed composition of droplets at the swirler inlet. The calculation of the nonnormalized distribution function averaged over the section of the separation device for droplets flying through the interblade channels without interaction with the swirler blades is performed. Graphical dependences of the droplet distribution density function are presented. A calculated ratio is presented to determine the average value of the mass fraction of liquid droplets that does not interact with the swirler blades. An analysis of the dispersed composition of droplets flying through the interblade channels of the swirler without interaction with the blades shows that this phenomenon is typical only for fine droplets.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1755 - 1759"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Locally One-Dimensional Scheme for the Distribution Function Equation by Ice Particle Masses Considering the Interaction of Droplets and Crystals","authors":"B. A. Ashabokov,&nbsp;A. Kh. Khibiev,&nbsp;M. Kh. Shkhanukov-Lafishev","doi":"10.1134/S0040579525600457","DOIUrl":"10.1134/S0040579525600457","url":null,"abstract":"<p>This work is devoted to the construction of a locally one-dimensional difference scheme for calculating the first boundary value problem for a general parabolic equation for the mass distribution function of ice particles. The functions <span>({{u}_{1}}(x,z,m,t),,,{{u}_{2}}(x,z,m,t))</span> are introduced such that <span>({{u}_{1}}(x,z,m,t)dm)</span> and <span>({{u}_{2}}(x,z,m,t)dm)</span> give at each point <span>((x,z))</span> at time <span>(t)</span> the concentration of cloud droplets and ice particles, respectively, whose mass is in the range from <span>(m)</span> to <span>(m + dm.)</span> The equation is written with respect to the function <span>({{u}_{2}}(x,z,m,t))</span>; the function <span>({{u}_{1}}(x,z,m,t))</span> (the droplet mass distribution function) is given in the equation. The equation is part of a system of integro-differential equations for the mass distribution functions of droplets and ice particles describing microphysical processes in convective clouds against the background of a given thermohydrodynamics. A locally one-dimensional difference scheme for a general parabolic equation in a <span>(p)</span>‑dimensional parallelepiped is constructed by the method of total approximation. To describe the interaction of droplets and crystals, nonlocal (nonlinear) integral sources are included in the equation. Using energy inequalities, an a priori estimate is obtained, from which follows the stability and convergence of the difference scheme. The results of the work will be used to build a model of microphysical processes in mixed convective clouds, which will be used to conduct research in topical areas such as the study of the role of the system properties of clouds in the formation of their microstructural characteristics and the development of technology for managing precipitation processes in convective clouds by introducing particles of ice-forming reagents.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1745 - 1751"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical Processing of Field Data to Predict Additional Production after the Use of Conformance Control Technology","authors":"A. Gilmanov,&nbsp;A. Shevelev","doi":"10.1134/S0040579525601128","DOIUrl":"10.1134/S0040579525601128","url":null,"abstract":"<p>Currently, a considerable number of wells in the oil fields in the world are subject to high production water cut. With layered heterogeneity of the formation, the conformance control technology is used, the modelling of which allows optimizing the injection volumes of reagents. For the completeness of the analysis, it is necessary to use field data on producing wells. The aim of the work is to select criteria for filtering the analyzed data for interpreting the curves of oil production decline, since these data may have significant noise. The experience of applying the conformance control technology in several fields in Western Siberia is considered. Filtering of field data by producing wells was implemented using the Kalman filter. An algorithm for interpreting the curves of oil production decline is proposed and tested. Treatment with a suspension system of one of the injection wells showed a qualitative confirmation of the proposed ideas.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1760 - 1765"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Classification of Structural Components of Heterogeneous Fluid Flows","authors":"Yu. D. Chashechkin","doi":"10.1134/S0040579525601141","DOIUrl":"10.1134/S0040579525601141","url":null,"abstract":"<div><p>In accordance with the principles of modern logic, including the requirement of definitiveness of the object and the method of research, the fundamentals of fluid mechanics are analyzed by consistent methods of engineering mathematics and technical physics. The classification of components of periodic flows of heterogeneous liquids and gases is carried out with control over the fulfillment of the compatibility condition when solving the system of fundamental equations. In a single formulation, gravitational surface and internal (as well as capillary and acoustic) waves and accompanying families of ligaments are considered. Examples of flow pattern analysis in natural and laboratory conditions are given.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1752 - 1754"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two Types of Limitations in Modeling Chemical Processes at Elevated Pressures","authors":"Yu. K. Tovbin,&nbsp;E. V. Votyakov","doi":"10.1134/S0040579525600810","DOIUrl":"10.1134/S0040579525600810","url":null,"abstract":"<p>The authors discuss two types of limitations in today’s means modeling chemical processes at elevated pressures. These limitations are due to the specificity of thermodynamics in the vicinity of the critical point and incorrectly applying the law of mass action at elevated pressures. The first type of limitations singles out the range of thermodynamic parameters near the critical region of the compound, which slow the transfer of mass near the critical region and cause greater density fluctuations at temperatures above and below the critical temperature. These conditions prevent the use of technological processes. An analysis is performed using the molecular theory for non-ideal reaction systems based on the lattice gas model. The second type of limitations specifies the range of thermodynamic parameters in modeling chemical processes at elevated pressures, for which the use of the above molecular theory and the law of mass action for ideal systems differ noticeably.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1727 - 1744"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Surface Wettability in a Modular Contact Device","authors":"D. M. Bukharov,&nbsp;A. V. Stepykin,&nbsp;A. A. Sidyagin,&nbsp;T. V. Zharova,&nbsp;L. A. Malygin,&nbsp;N. S. Goryunov,&nbsp;E. M. Tutanina","doi":"10.1134/S0040579525600986","DOIUrl":"10.1134/S0040579525600986","url":null,"abstract":"<p>This study analyzes the wettability of a standard packing of heat and mass transfer equipment. Packing elements with corrugation profile angles of 85°, 100°, and 115° are used as the main experimental models. The study of wettability is conducted in a laboratory setting using a specialized test bench. The contact device module is irrigated with water, which is subsequently drained into the sewer system. To assess wettability, the device is dyed with water-soluble dye. Wettability φ is determined from the dye traces on the elements by calculating the ratio of the undyed surface to the total surface. The study has revealed that the operation of the contact device requires minimum irrigation. The calculation of the minimum irrigation density is conducted according to the known dependence proposed by V.M. Ramm. The best wettability of packing elements is attained at a corrugation profile angle of 85°, while the worst wettability is observed at a corrugation profile angle of 115°. At the same time, for all packing modifications, the wetted surface area φ exceeds 62%.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"1929 - 1935"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Localization of Cesium Iodide Vapor on Ceramic Block–Cell Contact Elements in a Nitrogen Environment","authors":"M. D. Gasparyan,&nbsp;V. N. Grunskii,&nbsp;Yu. S. Mochalov,&nbsp;L. P. Sukhanov,&nbsp;A. V. Titov,&nbsp;S. V. Tishchenko,&nbsp;E. O. Obukhov","doi":"10.1134/S0040579525600688","DOIUrl":"10.1134/S0040579525600688","url":null,"abstract":"<p>The efficiency of separate collection of cesium oxide and molecular iodine, formed during the decomposition of cesium iodide in the process of high-temperature chemisorption on ceramic highly porous block–cell contact elements in a nitrogen environment is studied. The dynamic sorption capacity of the contact elements with an applied aluminosilicate sorption-active layer and with an active layer of silver nitrate for cesium and iodine, respectively, is determined. The developed contact elements are recommended for use in a local gas-cleaning system of the pyrochemical stage of processing of irradiated nuclear fuel from fast neutron reactors.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 5","pages":"1610 - 1618"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Self-Healing Coatings Containing Layered Double Hydroxides Impregnated with a Corrosion Inhibitor for Anti-Corrosion Protection of Magnesium Alloys","authors":"A. S. Gnedenkov,&nbsp;S. L. Sinebryukhov,&nbsp;A. D. Nomerovskii,&nbsp;S. V. Gnedenkov","doi":"10.1134/S0040579525601074","DOIUrl":"10.1134/S0040579525601074","url":null,"abstract":"<p>Using the plasma electrolytic oxidation method, a porous ceramic-like matrix is formed on the surface of the MA8 magnesium alloy. The surface of the heterooxide layer is functionalized by forming a film of layered double hydroxides. Several methods for intercalation of the formed nanocontainers with a corrosion inhibitor (benzotriazole) are proposed. The composition, morphology, corrosion behavior, and self-healing mechanism of the formed coating are studied.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 6","pages":"2017 - 2027"},"PeriodicalIF":0.7,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676431","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy-Efficient Engineering of Technologies in the Field of Electrochemical Treatment of Oil-Containing Soils","authors":"V. P. Meshalkin,&nbsp;N. S. Shulaev,&nbsp;V. V. Pryanichnikova,&nbsp;R. R. Kadyrov","doi":"10.1134/S0040579525600251","DOIUrl":"10.1134/S0040579525600251","url":null,"abstract":"<p>The formation of complex and diverse oil-containing waste is one of the pressing environmental problems of the oil complex, as well as a consequence of the increasing volumes of transportation and use of oil and its refined products. Such waste also includes soil contaminated with oil and oil products, which often also contains solutions of mineral salts (as part of produced water), heavy metals, and other components. Recycling and mitigating waste of this kind is extremely difficult and expensive when it comes to removal and processing at specialized landfills. More economical is the physical-chemical treatment of the soil in field conditions, which includes electrochemical cleaning by passing low-amplitude currents through contaminated rock. Despite the fact that the method has a number of undeniable advantages, the most important of which are the ability to create electric fields in the soil at great depth and the compactness of the technical systems, there are a number of factors that complicate the process. The factors include, first of all, the heterogeneity of the soil structure and the distribution of polluting chemical components in the environment being cleaned and the dynamics of moisture content (due to the influx of moisture from atmospheric precipitation). The geochemical diversity and topography of the contaminated area also introduce complications. This work is devoted to the features of modeling of the process of physical and chemical cleaning of contaminated soils for the subsequent design of installations taking into account the above factors and determining the key parameters of their operation in order to achieve maximum energy efficiency and environmental friendliness.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 4","pages":"1135 - 1142"},"PeriodicalIF":0.7,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}