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Decomposition of the Gas–Coal Solid Solution in Coal Beds: Energy Analysis
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600058
V. A. Bobin, E. N. Kozyreva
{"title":"Decomposition of the Gas–Coal Solid Solution in Coal Beds: Energy Analysis","authors":"V. A. Bobin,&nbsp;E. N. Kozyreva","doi":"10.3103/S1068364X25600058","DOIUrl":"10.3103/S1068364X25600058","url":null,"abstract":"<p>A gas–coal solid solution is shown to be a metastable form of methane molecules in the coal microstructure. Its decomposition on account of molecular repulsion occurs when the pressure in the coal bed is released. It is also established that the gas content of the coal bed consists of the methane formed in the coal bed over its entire geological existence and cannot be estimated by means of the Langmuir formula. A model developed for the decomposition of the gas–coal solid solution yields a mathematical equation describing this process.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"7 - 10"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Graphene Oxide on Geopolymerization in Concrete: Insights from Intermediate-Stage Quenching Reactions
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600034
Simon Judes Sujatha,  Mariyasoosai Arulraj Raja
{"title":"Influence of Graphene Oxide on Geopolymerization in Concrete: Insights from Intermediate-Stage Quenching Reactions","authors":"Simon Judes Sujatha,&nbsp; Mariyasoosai Arulraj Raja","doi":"10.3103/S1068364X25600034","DOIUrl":"10.3103/S1068364X25600034","url":null,"abstract":"<p>This study investigated the influence of graphene oxide on the products of geopolymerization by interrupting the process at various stages throughout different time intervals. The evolution of phase composition and valence bond structure was systematically investigated. The ethanol/acetone solution successfully separated reaction products throughout the first phase (0–24 h). Reduced graphene oxide (rGO) exhibited strong adhesion to the geopolymer matrix throughout the reaction. As the reaction progressed, the material became denser, with a decrease in its amorphous nature. The incorporation of rGO accelerated the transformation of Al–O coordination from five and six to four, leading to the formation of a Q4(3Al) network structure with silicon atoms.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"67 - 81"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reducing the Content of the >80 mm Class in Metallurgical Coke. 1. Literature Review
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X2560006X
D. I. Alekseev, E. A. Milenina, A. V. Shvaleva, M. N. Stepanova, D. A. Tarakin, I. A. Golovashov, V. E. Gorshenina, E. A. Kuzmina
{"title":"Reducing the Content of the >80 mm Class in Metallurgical Coke. 1. Literature Review","authors":"D. I. Alekseev,&nbsp;E. A. Milenina,&nbsp;A. V. Shvaleva,&nbsp;M. N. Stepanova,&nbsp;D. A. Tarakin,&nbsp;I. A. Golovashov,&nbsp;V. E. Gorshenina,&nbsp;E. A. Kuzmina","doi":"10.3103/S1068364X2560006X","DOIUrl":"10.3103/S1068364X2560006X","url":null,"abstract":"<div><p>In the present research, means of reducing the content of the &gt;80 mm class in metallurgical coke at coke batteries 1, 3, and 4 of Ural Steel are considered, in the light of the need to minimize batch cost and maximize coke quality (specifically, the strength indices <i>M</i><sub>10</sub> and <i>M</i><sub>25</sub>). This problem was suggested by students in production education groups at the Novotroitsk branch of Moscow Institute of Steel and Alloys (MISIS). This first article in the series is a literature review, beginning in the 1960s. The influence of the following factors on the content of the &gt;80 mm class is discussed: the rank composition of the batch; its moisture content; and coking parameters such as the coking time, the temperature in the controlled heating channels, and the coking rate. The second article will be devoted to mathematical analysis of a passive experiment based on Ural Steel data, with the goal of identifying the factors affecting the content of the &gt;80 mm class in the coke produced at Ural Steel; the results of this analysis will be compared with literature data. The third article will present models of the content of the &gt;80 mm class in the coke produced, with subsequent optimization and testing by laboratory coking.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"11 - 16"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Oxidation Products of Electrode Pitch in a Reactor with Large Gas Capacity
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600071
R. Yu. Kovalev, A. P. Nikitin
{"title":"Oxidation Products of Electrode Pitch in a Reactor with Large Gas Capacity","authors":"R. Yu. Kovalev,&nbsp;A. P. Nikitin","doi":"10.3103/S1068364X25600071","DOIUrl":"10.3103/S1068364X25600071","url":null,"abstract":"<div><p>The oxidation products of electrode pitch (category C) in a reactor with large gas capacity are considered. The influence of the oxidation time on the softening point and yield of volatiles in the production of high-temperature coal tar pitch is determined. In the experiments, the oxidation of electrode pitch is investigated as a function of the oxidation time and the maximum temperature. Oxidation occurs in the range 260–360°C. The air flow rate is 800 L/kg h. The yield of products, the softening point, and the yield of volatiles are determined as a function of the oxidation time. The increase in softening point may be attributed to the increase in oxidation time at temperatures above 300°C. The conditions for the production of high-temperature coal tar pitch by oxidation of electrode pitch are established. The dependence of the carbonizate yield on the oxidation time is determined.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"17 - 22"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Physical and Chemical Analysis of Carbonized Sapropelic Coal
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600083
G. Y. Simenyuk, T. A. Larichev, A. N. Popova, N. S. Zakharov, T. O. Sergina, I. Y. Zykov, Yu. A. Zakharov
{"title":"Physical and Chemical Analysis of Carbonized Sapropelic Coal","authors":"G. Y. Simenyuk,&nbsp;T. A. Larichev,&nbsp;A. N. Popova,&nbsp;N. S. Zakharov,&nbsp;T. O. Sergina,&nbsp;I. Y. Zykov,&nbsp;Yu. A. Zakharov","doi":"10.3103/S1068364X25600083","DOIUrl":"10.3103/S1068364X25600083","url":null,"abstract":"<div><p>By comprehensive physical and chemical analysis, the suitability of carbonized sapropelic coal for use in supercapacitor electrodes and as a matrix for nanostructural composites is assessed. IR spectroscopy shows that the surface of the carbon material contains aliphatic and hydroxyl groups, as well as polyene groups. Analysis of nitrogen adsorption–desorption isotherms indicates that micropore structure predominates in the carbonizate: the mean pore diameter is 1.83 nm; the specific surface is 1472 m<sup>2</sup>/g; the total pore volume is 0.594 cm<sup>3</sup>/g; and the proportion of mesopore space is 31.7%. In terms of the size distribution of the pores, almost no pores greater than 5–6 nm are present. When the potential is scanned at rates of 1 and 10 mV/s, the electrical capacitance is 537 and 387 F/g, respectively. The results obtained for test cells on the basis of the galvanostatic charging and electrochemical impedance spectroscopy are consistent with data obtained by cyclic voltammetry. The capacitance data for the cells are determined on the basis of simplified equivalent circuits, using ZSimpWin software. Calculated and experimental Nyquist plots for the equivalent circuits are compared, and the Pearson consistency index is determined. There are good prospects for the use of carbonized sapropelic coal for use in supercapacitor electrodes and as a matrix for nanostructural composites.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"23 - 34"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Combustion of Petroleum Coke with Pyrolytic Residue from Scrap Tires
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600095
A. V. Gubin, A. Zh. Kaltaev, A. S. Gorshkov, K. B. Larionov
{"title":"Combustion of Petroleum Coke with Pyrolytic Residue from Scrap Tires","authors":"A. V. Gubin,&nbsp;A. Zh. Kaltaev,&nbsp;A. S. Gorshkov,&nbsp;K. B. Larionov","doi":"10.3103/S1068364X25600095","DOIUrl":"10.3103/S1068364X25600095","url":null,"abstract":"<div><p>The possibility of using petroleum coke and the pyrolytic carbon residue from scrap tires as a mixed fuel is considered. The influence of the coke/residue ratio (by mass) in the mixture on oxidation, ignition, and combustion is studied. The oxidation, ignition, and combustion characteristics of the samples are determined by thermal analysis and high-speed video recording in a combustion chamber at 1000°C. Increase in content of the carbon residue increases the reactivity of the mixture. Correspondingly, the initial temperature of intense oxidation <i>T</i><sub><i>i</i></sub> decreases (Δ<i>T</i><sub><i>i</i></sub> = 126°C) and the ignition delay τ<sub><i>i</i></sub> is reduced (Δτ<sub><i>i</i></sub> = 1.54 s). Likewise, there is an increase in the oxidation rate, determined by thermal analysis and on the basis of the unit heat liberation. Increasing the content of the pyrolytic tire residue results in less complete fuel combustion.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"35 - 44"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of Fin Condition on Heat Transfer Characteristics of Ascension Pipes
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X24601252
Zhao Xie, Anni Hu, Hongming Fang, Shitong Liu, Lan Yi, Weirun Lan
{"title":"Influence of Fin Condition on Heat Transfer Characteristics of Ascension Pipes","authors":"Zhao Xie,&nbsp;Anni Hu,&nbsp;Hongming Fang,&nbsp;Shitong Liu,&nbsp;Lan Yi,&nbsp;Weirun Lan","doi":"10.3103/S1068364X24601252","DOIUrl":"10.3103/S1068364X24601252","url":null,"abstract":"<p>Approximate 36% of the total heat is produced by coke oven gas (COG) in the coke oven and has a great potential for recovery. In order to recover the surplus heat effectively, a water-jacketed coke oven heat exchanger is installed at the coke oven ascension pipe. However, this core unit suffers from uneven water vapor distribution on the jacket side, which leads to decreased heat transfer efficiency and localized high temperature bulging. In this study, Fluent was used to simulate a single jacketed heat exchanger to investigate the effect of fin position (water jacket side or COG side) and its number (4, 8, 12) on the heat transfer characteristics of the ascension pipe when the flow rate of cooling water on the water jacket side is 0.3 m/s at a coking time of 16 h. The results indicate that, considering the flow field, performance evaluation metrics, and practical engineering issues, it is more advantageous to install the fins on the water jacket side. Furthermore, as the number of fins on the water jacket side increases, the outlet temperature on the COG side decreases, leading to enhanced heat transfer efficiency. The heat transfer effect was optimal when the number of fins of jacketed ascension pipe heat exchanger was augmented to a total of 12.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"52 - 66"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Phototransformation Processes of Oil Sands Bitumen Under the Influence of Ultraviolet Radiation
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600022
Rena A. Jafarova, Ulviyya J. Yolchuyeva, Orhan R. Abbasov, Aygul F. Aliyeva, Elnur E. Baloglanov, Nazli A. Mehdiyeva, Fatma I. Gasimova
{"title":"Phototransformation Processes of Oil Sands Bitumen Under the Influence of Ultraviolet Radiation","authors":"Rena A. Jafarova,&nbsp;Ulviyya J. Yolchuyeva,&nbsp;Orhan R. Abbasov,&nbsp;Aygul F. Aliyeva,&nbsp;Elnur E. Baloglanov,&nbsp;Nazli A. Mehdiyeva,&nbsp;Fatma I. Gasimova","doi":"10.3103/S1068364X25600022","DOIUrl":"10.3103/S1068364X25600022","url":null,"abstract":"<p>The need to obtain lighter hydrocarbon products from organic compounds, including bitumen extracted from oil sands in contact with the atmosphere, requires the study of chemical transformations in their composition<i>.</i>This chemical transformation is characterized by a change in the composition of bitumen and its oxidation under the influence of sunlight. In this work, changes in the structure of aromatic hydrocarbons of oxidized organic compounds in oil sand samples from the Girgishlag-Girdagh outcrop of Eastern Azerbaijan under the influence of sunlight were studied using ultraviolet (UV), infrared (IR) and luminescent methods. Two hours of photoirradiation resulted in the formation of cyclic peroxides, endoperoxides and hydroxynones from polycyclic aromatic hydrocarbons (PAHs). Cyclic peroxides, formed under the influence of high-energy photons, disappeared when exposed to polychromatic rays. Thus, our experimental studies allow us to evaluate the mechanism of the oxidation process and its time-dependent existence in bitumen oxidized under the influence of sunlight. This approach can be considered as one of the criteria for assessing the possibilities of obtaining fuel and energy products from oil sands and heavy hydrocarbons.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"45 - 51"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reducing the Thermal Oxidation of Coal by Steeping in Lime Solutions
IF 0.4
Coke and Chemistry Pub Date : 2025-05-13 DOI: 10.3103/S1068364X25600046
Yu. F. Patrakov, S. A. Semenova, A. E. Majorov
{"title":"Reducing the Thermal Oxidation of Coal by Steeping in Lime Solutions","authors":"Yu. F. Patrakov,&nbsp;S. A. Semenova,&nbsp;A. E. Majorov","doi":"10.3103/S1068364X25600046","DOIUrl":"10.3103/S1068364X25600046","url":null,"abstract":"<div><p>This research focuses on how steeping with industrial mixtures based on lime affects the oxidative pyrolysis of coal of limited metamorphic development that is inclined to self-ignition. Passivating solutions considered include the filtrate and suspension of a lime solution, which are traditionally used to suppress coal oxidation. Treatment of coal with lime solutions is accompanied both by physical adsorption of calcium ions on the nonuniform coal surface and by chemical reaction with functional groups that are susceptible to oxidation. The fundamental differences in the oxidation of coal of little and moderate metamorphic development with lime solutions are identified. After treatment of coal surfaces with lime solutions, less oxidation is observed.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 1","pages":"1 - 6"},"PeriodicalIF":0.4,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Production of Mesophase Binder Pitch from Thermally Cracked Decantoil and Its +250°C Fraction. 1. Physical and Chemical Properties of the Raw Materials 热裂解癸酸及其+250℃馏分制备中间相粘结剂沥青原料的物理和化学性质
IF 0.4
Coke and Chemistry Pub Date : 2025-03-14 DOI: 10.3103/S1068364X24601185
A. A. Mukhamedzyanova, A. N. Lobov, N. Yu. Beilina
{"title":"Production of Mesophase Binder Pitch from Thermally Cracked Decantoil and Its +250°C Fraction. 1. Physical and Chemical Properties of the Raw Materials","authors":"A. A. Mukhamedzyanova,&nbsp;A. N. Lobov,&nbsp;N. Yu. Beilina","doi":"10.3103/S1068364X24601185","DOIUrl":"10.3103/S1068364X24601185","url":null,"abstract":"<div><p>Petroleum pitch is a valuable raw material in many industries. It is in considerable demand: 10<sup>4</sup>–10<sup>5</sup> t/yr. In the present work, the physicochemical properties of thermally cracked decantoil (decanted heavy gas oil) and its 250°C fraction are investigated by standard methods used for petroleum derivatives. In terms of its group composition, content of condensed polyaromatic compounds, coking properties, and sulfur content, these materials are suitable for the production of binders used in the electrode industry and carbon–carbon construction materials.</p></div>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"67 12","pages":"715 - 722"},"PeriodicalIF":0.4,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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