Theoretical Foundations of Chemical Engineering最新文献_第4页

Effects of Inorganic Additives on Slagging Characteristics of Peanut Shell Pellet Fuel 无机添加剂对花生壳颗粒燃料结渣特性的影响

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523070023

Rong Chen, Rumeng Dong, Yuwei Hu, Chengjun Gao, Xueping Zhang

{"title":"Effects of Inorganic Additives on Slagging Characteristics of Peanut Shell Pellet Fuel","authors":"Rong Chen, Rumeng Dong, Yuwei Hu, Chengjun Gao, Xueping Zhang","doi":"10.1134/S0040579523070023","DOIUrl":"10.1134/S0040579523070023","url":null,"abstract":"In order to alleviate the problem of slagging caused by biomass combustion, this paper studied the slagging characteristics of peanut shell shaped granular fuel under different inorganic additives and their mixing ratios. X-ray fluorescence spectroscopy, X-ray diffraction and five evaluation indexes, such as contamination index, iron-calcium ratio, alkali-acid ratio, silicon ratio and silicon-aluminum ratio, were used to analyze the ash generated by the combustion of peanut shell shaped granular fuel. The results showed that the more acidic oxides, the less alkaline oxides, the higher the ash melting point, the less easy to slag, that is, the smaller the alkali-acid ratio, the less easy to slag. Comparing the values of the five evaluation indexes, such as contamination index, iron-calcium ratio, alkali-acid ratio, silicon ratio and silicon-aluminum ratio, it was found that the slag removal effect of kaolin additive was the best. Under the high temperature mode, the five evaluation indexes were 0.32, 0.56, 0.30, 0.79, 1.83, respectively. Under the low temperature mode, they were 0.17, 0.67, 0.25, 0.81, 1.68, respectively. It was obviously better than the slag removal effect of MgO, CaO or the proportional mixture of the three additives. This study provides a certain reference for reducing the slagging phenomenon generated by the combustion of peanut shell shaped granular fuel.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140097568","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}

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Erratum to: Reliability of Nanofiltration Membrane Process for Brackish Water Treatment in Baghdad City: Module Modeling and Simulation 勘误：用于巴格达市咸水处理的纳滤膜工艺的可靠性：模块建模与仿真

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523330060

Sufyan Fadhil

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A Comparative Investigation of an Argon Dielectric Barrier Discharge Reactor under the Variation of Plasma Conditions for Optimization of Power Deposition 等离子体条件变化下氩介质势垒放电反应器优化功率沉积的比较研究

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523330059

E. Poorreza, R. Hadjiaghaie Vafaie

{"title":"A Comparative Investigation of an Argon Dielectric Barrier Discharge Reactor under the Variation of Plasma Conditions for Optimization of Power Deposition","authors":"E. Poorreza, R. Hadjiaghaie Vafaie","doi":"10.1134/S0040579523330059","DOIUrl":"10.1134/S0040579523330059","url":null,"abstract":"Gas discharges in the plasma atmosphere are known to consist of a collection of different particles, mainly electrons, ions, neutral atoms, and molecules. The present need is to characterize the plasmas and optimization of the designed plasma system under variable conditions. In this work, a time-dependent, one-dimensional simulation of an optimized DBD device, driven by a sinusoidal alternating high voltage, in argon gas is demonstrated. First of all, a DBD device with two electrodes, covered by the dielectric and with the variable discharge gap was assumed, and the discharge parameters were simulated versus time across the plasma gap. A comparison between the results is carried out. In the second part, with a fixed gap that was obtained from previous section, when the dielectric thickness changed, the plasma parameters were simulated. In the third case, with a fixed discharge gap and dielectric thickness, the plate diameters were varied and the best diameter was selected to deliver the best power deposition. Finally, the operating frequency and voltage were varied and the optimized values were obtained. Time-dependent and 1D profiles of the electric field, electron density, electron temperature, ion current density, electron current density, plasma, total current, and power deposition are demonstrated.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140098039","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}

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Kinetically Investigation of Ibuprofen Ozonation Catalyzed by Graphene Oxide/Fe3O4: A Monte Carlo Simulation 氧化石墨烯/Fe3O4 催化布洛芬臭氧反应的动力学研究：蒙特卡罗模拟

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523330011

Hamid Dezhampanah, Hamed Moradmand Jalali

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Effect of Hydrophobicity on Talc Grinding in Attritor Mill 疏水性对 Attritor 磨机中滑石粉研磨的影响

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523060039

S. E. El-Mofty, A. M. El-Bendary, A. A. El-Midany, M. K. Abd El-Rahman

{"title":"Effect of Hydrophobicity on Talc Grinding in Attritor Mill","authors":"S. E. El-Mofty, A. M. El-Bendary, A. A. El-Midany, M. K. Abd El-Rahman","doi":"10.1134/S0040579523060039","DOIUrl":"10.1134/S0040579523060039","url":null,"abstract":"Talc, as an industrial mineral, is usually used at fine and ultrafine sizes in different applications. However, reaching the ultrafine sizes depends simultaneously on grinding conditions and the characteristics of the mineral to be ground. In this paper, the effect of talc hydrophobicity and grinding conditions in terms of grinding balls size, mill filling, grinding time, stirrer speed, and solids% on producing –45 microns in an attritor mill were studied. The change in talc particle size in dry and wet grinding modes was recorded along with monitoring the structural change by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that the d50 of the ground product reaches 10 µm or less at 10 mm media size, 60 min grinding time, 385 rpm stirring speed, 40% solids, and 25% mill filling. Nevertheless, under the same conditions, dry grinding not only gives a smaller product but also has higher structural changes than wet grinding. The talc hydrophobicity leads to talc particles agglomeration in aqueous media and consequently, a part of grinding energy is consumed in agglomerates breakdown resulting in delaying not only the reach to the same size as in the dry grinding but also the crystal lattice destruction. Inevitably, the intensive grinding to ≤ –5 µm changes the talc structure drastically in both grinding modes.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887563","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}

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Localization of Vapors of Cesium Iodide on Ceramic Block-Cellular Contact Elements in an Oxidizing Environment 氧化环境中陶瓷块状细胞接触元件上碘化铯蒸汽的定位

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523060064

M. D. Gasparyan, V. N. Grunskii, Yu. S. Mochalov, L. P. Sukhanov, A. V. Titov, S. V. Tishchenko, E. O. Obukhov

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pH Control of Yeast Fed-Batch Fermentation Process by Improved Input-Output Linearization Method 用改进的输入输出线性化方法控制酵母间歇发酵过程的 pH 值

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523060088

Hyok-Chol Ju, Kuk-Chol Ri, Ji-Song Jon, Chol-Jin Kim

{"title":"pH Control of Yeast Fed-Batch Fermentation Process by Improved Input-Output Linearization Method","authors":"Hyok-Chol Ju, Kuk-Chol Ri, Ji-Song Jon, Chol-Jin Kim","doi":"10.1134/S0040579523060088","DOIUrl":"10.1134/S0040579523060088","url":null,"abstract":"In general, there are many influencing factors in the cultivation of microorganisms, including yeast, among which pH control is of great importance. Since the pH characteristics of yeast fermentation processes are nonlinearity and the production of acid during yeast fermentation is typically nonlinearity, the process pH values cannot be adjusted rapidly and accurately by conventional linear control techniques. Hence, the intrinsic nonlinear characteristics of the pH control system are approximated by several nonlinear models including Hammerstein–Wiener model, and a controller is designed based on the models. To increase the yield in yeast cultures, fed-batch fermentation method should be used more than batch cultivation method. In brief, fed-batch fermentation is a method of continuous addition of the nutrient solution(glucose fluid) following the number of yeast cells present inside the yeast fermentation tank. In this paper, a mathematical model based on chemical equilibrium is proposed to control the pH of an industrial yeast fermentation tank with only inflow, no outflow, and relatively large internal volume, and a controller is designed using the input-output linearization method. The performance of the designed controller is verified by numerical simulation and field experiments.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887568","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}

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Surface Renewal and Residence Time Distribution of Highly Viscous Liquid Falling Film Flow 高粘性液体落膜流的表面更新和停留时间分布

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523060209

Wenxu Yuan, Jianping Ma, Shichang Chen

{"title":"Surface Renewal and Residence Time Distribution of Highly Viscous Liquid Falling Film Flow","authors":"Wenxu Yuan, Jianping Ma, Shichang Chen","doi":"10.1134/S0040579523060209","DOIUrl":"10.1134/S0040579523060209","url":null,"abstract":"The flow behaviors of highly viscous fluid falling film outside the vertical tube were investigated by theoretical analysis and numerical simulation. Based on gas-liquid two-phase flow methods, a new insight into flow behaviors, which mainly referred to the film thickness distribution, surface renewal frequency and residence time distribution of the highly viscous fluid falling film outside the vertical tube, were provided. Moreover, the correlation between film thickness and fluid viscosity and flow rate was established through model analysis. The numerical simulation results of film thickness were in good agreement with the experimental and theoretical values. The film surface dilated at the beginning of the falling film, and then gradually reached stable state with the largest thickness value. The distribution curve of falling film velocity from wall surface to free surface was in line with the typical Nusselt semi-parabolic profile. Normally, a large flow rate or a low fluid viscosity corresponds to a high surface renewal frequency and a narrow residence time distribution of falling film flow. The dimensionless residence time distribution of falling film flow showed little difference under different conditions, which indicates that the vertical tube falling film flow has a good application prospect in the production of high viscosity materials with uniform quality.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887651","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}

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Synergistic Effects of Hydrophilic-Hydrophobic Porous Structures for Enhancing Nucleate Pool Boiling Heat Transfer 亲水-疏水多孔结构在增强核酸池沸腾传热方面的协同效应

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523060106

Xiaowen Zhang, Yingjie Kang, Zhongmin Lang, Wugang Qiang, Xiangyang Gao

{"title":"Synergistic Effects of Hydrophilic-Hydrophobic Porous Structures for Enhancing Nucleate Pool Boiling Heat Transfer","authors":"Xiaowen Zhang, Yingjie Kang, Zhongmin Lang, Wugang Qiang, Xiangyang Gao","doi":"10.1134/S0040579523060106","DOIUrl":"10.1134/S0040579523060106","url":null,"abstract":"Boiling is an efficient mode of heat transfer and has important applications that use high heat flux systems. However, a single wettable boiling surface is not appropriate for the dual requirements of low superheat for nucleation and high critical heat flux. Here, we present a hydrophilic composite and a functional hydrophilic-hydrophobic partitioned porous structure that significantly improves boiling heat transfer performance via a double-sintering process. The superheat requirement for the onset of nucleate boiling decreased from 2°C on the single hydrophilic porous structure to 1°C on the hydrophilic-hydrophobic porous structure, the critical heat flux was reduced by 3.3% in the early stages of boiling (below 250 kW/m2), the heat transfer efficiency increased by 20%, and the heat transfer was comparable to that of the hydrophilic porous structure. Bubble dynamics were observed using a high-speed camera. The results demonstrate that the bubble nucleation sites mainly occur in the hydrophobic region and this is attributed to a decrease in the energy barrier for nucleation. The bubble dynamic statistics revealed that the product of the diameter of the bubble and the bubble escape frequency are similar for composite surfaces and hydrophilic porous surfaces, which is consistent with Zuber’s conclusion. The synergistic effect of the hydrophilic-hydrophobic partitioned porous structure can promote nucleation in the hydrophobic region and retain capillary suction for liquid reflux in the hydrophilic region to enhance boiling heat transfer. This work enables the large-scale deployment of heat exchanger surface processing technology because of its low cost, availability, and reliability.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140097573","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}

引用次数: 0

Bioinspired Superhydrophobic Material with Nafion Polymer for Anti-Icing Coating on Aluminium Alloy Surface 用于铝合金表面抗冰涂层的 Nafion 聚合物生物启发超疏水材料

IF 0.7 4区工程技术

Theoretical Foundations of Chemical Engineering Pub Date : 2024-03-10 DOI: 10.1134/S0040579523330072

G. Prasad, G. Vidya, J. Bruce Ralphin Rose, P. Karuppasamy

{"title":"Bioinspired Superhydrophobic Material with Nafion Polymer for Anti-Icing Coating on Aluminium Alloy Surface","authors":"G. Prasad, G. Vidya, J. Bruce Ralphin Rose, P. Karuppasamy","doi":"10.1134/S0040579523330072","DOIUrl":"10.1134/S0040579523330072","url":null,"abstract":"Aircraft icing is the formation and accumulation of ice on an aircraft’s windward surface. The impingement of super-cooled water droplets floating in clouds against a solid surface is the primary cause. Because it affects the aerodynamic form and poses a rising hazard to flight safety. This research gives a technique to overcome the ice accretion problemby preparation of Superhydrophobic coatings that can be utilized in aircraft. To create superhydrophobic surfaces, scientists have used many surface-modified functional coating methods based on perfluorinated polymer mixed with biomaterials. Herein, a plant leaf extract (Senna auriculata (Avaram in Tamil) which possesses good self-cleaning properties and better water-repellant properties like a lotus leaf, and exhibits several industrial applications such as anti-corrosive, anti-fogging, and anti-icing. The dried leaf extract is blend with Nafion polymer in ethanol and the as-prepared mixture coated on the polished surface of the aluminum alloy plate by using spray coating technique. The modified aluminum alloy (AA6061) plate surface was characterized with the help of a metallurgical microscope in different magnifications, scanning electron microscope and the measured contact angle (θ → 153°) is in good agreement with the superhydrophobicity requirements. High-speed optical microscopy helped to identify steady coalescence-induced droplet jumping during atmospheric water vapor condensation. This experimental result provides a new avenue for the environmentally benign fabrication of superhydrophobic metal-modified surfaces for various automotive applications.","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140887565","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}

引用次数: 0