{"title":"Interaction Mechanisms of Co-Pyrolysis and Co-Gasification in Coals with Different Ranks Using Deviation Function Analysis","authors":"ZunJing Xiao, Yazhao Li, Jie Du, Rui Guo","doi":"10.3103/S1068364X25601039","DOIUrl":"10.3103/S1068364X25601039","url":null,"abstract":"<p>The growing scarcity of coking coal necessitates precise coal blending in the coking process. Using thermogravimetric analysis (TGA) experiments, this study investigates the co-pyrolysis and co-gasification behavior of gas coal (GC), coking coal (CC), lean coal (LC), and their blends, and quantifies interactions via the deviation function method. Results demonstrate that increasing the proportion of low-rank coal significantly reduces the maximum pyrolysis rate temperature (<i>T</i><sub>max</sub>) of the coal blends. Kinetic analysis reveals that apparent activation energy decreases with increasing proportion of low-rank coal at the DTG peak. During the initial pyrolysis stage of coal blends at 200–380°C, synergistic effects arise from the catalytic release of bound water by minerals and the decomposition of carboxylic acids. Conversely, steric hindrance from polycyclic aromatic hydrocarbons in high-rank coal induces antagonistic effects during the thermoplastic stage, impeding volatile release. Additionally, in gasification, the high reactivity of GC dominates the reaction process. At the same time, CaO in CC mediates CO<sub>2</sub> gasification through the CaCO<sub>3</sub> cycle, and LC’s elevated ash content inhibits active site release. This work elucidates pyrolysis patterns of coal blends at different temperatures and enables predictions for pyrolysis and coking processes.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"889 - 898"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336402","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}
{"title":"Improving the Mechanism for Emergency Extraction of the Leveling Rod in the Coke Ejection System at Ural Steel","authors":"D. R. Ganin, P. V. Shtifanov","doi":"10.3103/S1068364X25601246","DOIUrl":"10.3103/S1068364X25601246","url":null,"abstract":"<p>In the coke ejection system serving the ovens in coke batteries 1, 3, 4, and 6 in the coke shop at Ural Steel, a manual winch mounted beside the main drive is used to remove the leveling rod from the coke oven in the event of drive failure. Two workers cannot complete this task in less than an hour. Replacement of the manual winch by an electromechanical winch is proposed to automate and speed up the extraction of the rod in the coke ejection system and to improve the reliability of the emergency rod-extraction mechanism. Modernization of the emergency extraction mechanism reduces unplanned downtime and the cost of coke; increases the profitability and coke output; and eliminates manual labor. The capital investment may be quickly earned back.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"864 - 870"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336778","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}
{"title":"Analysis of Russian Literature on Coal Batch Compaction by Stamping. 1. Technological Factors","authors":"I. A. Osipova","doi":"10.3103/S1068364X25601192","DOIUrl":"10.3103/S1068364X25601192","url":null,"abstract":"<p>The main trends in Soviet and Russian research on the compaction of coal batch by stamping (stamp charging) are identified, beginning in the twentieth century. Factor analysis indicates two main topics: 1) the influence of stamped coal batch on the coke yield and strength; 2) detailed study of the influence of the batch’s packing density and moisture content on the pressure required and also the influence of the fractional composition of the coal and the batch, which, in turn, determines the effectiveness of stamping, the technical characteristics, and the properties of the stamped cake.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"835 - 839"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336403","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}
{"title":"Management of Unorganized Sources of Atmospheric Emissions at Coke Plants","authors":"V. T. Stefanenko","doi":"10.3103/S1068364X25601258","DOIUrl":"10.3103/S1068364X25601258","url":null,"abstract":"<p>An indirect method is proposed for monitoring sources of unorganized atmospheric emissions at coke plants. The basis of the method is outlined, and a computational algorithm is developed. The objectivity of the results is demonstrated for an example. The principles of an environmental management program are outlined.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"871 - 874"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336779","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}
{"title":"Simulation Study on the Safety of a Fully-Enclosed Coke Oven Shed","authors":"Meng Wu, Zhao Xie, Jian Zhou, Zhengnan Yu, Feng Liang, Hongchun Liu, Hongming Fang","doi":"10.3103/S1068364X25601167","DOIUrl":"10.3103/S1068364X25601167","url":null,"abstract":"<p>In recent years, the implementation of coke oven enclosure measures has been initiated to effectively collect and treat fugitive emissions from coke ovens. Currently, primary enclosure solutions mainly include fully-enclosed and semi-enclosed structural configurations. This study focuses on a fully-enclosed coke oven shed designed by a coking plant. By establishing a physical model, the research simulates the diffusion behavior of unburned dispersed raw gas inside the shed under specific conditions: a plant-wide power outage coupled with strong crosswinds, and a failure in the ignition of the vented gas. The simulation results are used to assess the safety of the internal environment within the large enclosure.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"882 - 888"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336400","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}
M. I. Mokritsky, R. E. Velikotsky, S. Y. Nikulin, N. A. Gridin, S. R. Shalaykin
{"title":"Modeling Predictors of Coke Production as a Function of the Lag Period with Zero Inertia","authors":"M. I. Mokritsky, R. E. Velikotsky, S. Y. Nikulin, N. A. Gridin, S. R. Shalaykin","doi":"10.3103/S1068364X25601180","DOIUrl":"10.3103/S1068364X25601180","url":null,"abstract":"<p>Mathematical modeling permits synchronous forecasting of the output of coking byproducts on the basis of four predictors (tar, benzene, ammonium sulfate, and coke oven gas), with simultaneous analysis of the proportion of ten coal ranks (G, GZhO, GZh, Zh, KZh, K, KO, KSN, KS, and OS) and nine chemical components of coal (moisture content, ash content, sulfur content, basicity of ash and coal, yield of volatiles in terms of dry mass and hot mass, plastic layer thickness, and mean vitrinite reflection coefficient). The goal of the present work is mathematical modeling of the output predictors (tar, benzene, ammonium sulfate, and coke oven gas) as a function of the lag period with zero inertia. The relation between the predictors and the Pearson correlation coefficient is determined, with sorting of the basic data set in terms of the covariation function. The relations between the covariation function and the Pearson correlation coefficient is plotted for the predictors. Correlations between the ratio of ten coal ranks and tar with a lag of 1–60 days and zero inertia are established, and the relation between a lag period of 1–60 days and the Pearson correlation coefficient with zero inertia is plotted for the given coal ranks. The results indicate that the physicochemical processes at the coke plant are complex. That imposes constraints on the development of the mathematical apparatus and the details of modeling for each rank of coal.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"823 - 834"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336774","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}
O. M. Gavrilyuk, S. A. Semenova, D. R. Nurmukhametov
{"title":"Changes in the Characteristics of Pitch on Modifying Coal Tar by Ozone in Chloroform","authors":"O. M. Gavrilyuk, S. A. Semenova, D. R. Nurmukhametov","doi":"10.3103/S1068364X25601222","DOIUrl":"10.3103/S1068364X25601222","url":null,"abstract":"<p>The quality of coal tar pitch samples obtained from industrial coal tar and tar modified by means of ozone in chloroform is compared. The structure of the pitch is determined by means of standard chemical analysis of the pitch, IR and NMR spectroscopy, and elemental and thermogravimetric analysis. The ozonolytic modification of coal tar in a neutral solvent (chloroform) increases the yield of pitch, its content of the α fraction (the sum of the α<sub>1</sub> and α<sub>2</sub> fractions), the softening point, and the yield of volatiles.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 10","pages":"852 - 857"},"PeriodicalIF":0.5,"publicationDate":"2026-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336776","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}
{"title":"Enhancing the Coke Quality and Yield by CDQ Process Optimization","authors":"Utkarsh Srivastava, Vinay Thool, Rashmi Singh, Amitabh Shankar, Debaprasad Chakraborty, Kumar Madan Mohan, Ashutosh Bhushan","doi":"10.3103/S1068364X25601015","DOIUrl":"10.3103/S1068364X25601015","url":null,"abstract":"<p>The advantage of coke dry quenching (CDQ) over the conventional wet quenching process in coke making not only helps in reducing the coke moisture (<1%) but also helps in power generation, by utilizing the sensible heat of incoming hot coke in the CDQ chamber. In addition to these benefits, other advantages are – Prevention of dust emission during coke quenching, Improvement in the performance of Blast Furnace, and Improved coke quality. In the CDQ process, the coke yield can be improved by reducing the solution loss reaction within the CDQ chamber. To achieve the same, a plant trial has been taken at the CDQ unit of Tata Steel Jamshedpur, with higher CO and H<sub>2</sub>% in the recirculating gas composition. The trial results found that it significantly affects coke quality and enhances the coke yield by 0.3% due to a reduction in solution loss reaction in the CDQ chamber. In the current article, methodology used to reduce the solution loss reaction and its positive impact on coke quality and coke yield is discussed.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 9","pages":"814 - 822"},"PeriodicalIF":0.5,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808671","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}
{"title":"Updating the Ten-Roller Screens in Coke Shop 1 at Ural Steel","authors":"D. R. Ganin, I. A. Frolov","doi":"10.3103/S1068364X25601118","DOIUrl":"10.3103/S1068364X25601118","url":null,"abstract":"<p>In coke shop 1 at Ural Steel, double ten-roller screens are employed for primary sorting of coke to isolate the >25 mm fraction, which is sent by conveyers to large-coke hoppers for subsequent loading on railroad cars. These screens are of complex design and difficult to maintain and repair, while the drives are of low efficiency. In screen operation, unplanned downtime is encountered. To improve their reliability, the existing drives of the sorting stands and the mechanisms for moving the screen are replaced by simpler and more reliable designs with a gear motor. Updating the screens simplifies their design and improves their reliability; reduces maintenance and repair costs and the frequency of unplanned downtime; and lowers production costs.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 9","pages":"800 - 805"},"PeriodicalIF":0.5,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808711","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}
{"title":"Synthesis of Coal Fly Ash-Based Solid Acids Mediated by Acidic Ternary Deep Eutectic Solvents","authors":"Jian Feng, Jia Guo, Yu Liu, Fang Peng, Xin Tian, Peng Wang","doi":"10.3103/S1068364X25601040","DOIUrl":"10.3103/S1068364X25601040","url":null,"abstract":"<p>In this work, a ternary acidic deep eutectic solvent (DES) comprising zirconyl chloride, choline chloride, and malonic acid was employed to modify coal fly ash, followed by chlorosulfonic acid sulfonation to prepare a coal fly ash-derived solid acid catalyst (CFA–DES–A). The catalyst exhibited outstanding performance in the condensation of ethylene glycol with cyclohexanone, affording a 92.4% yield under mild conditions (95°C, 4 h), with negligible loss of activity after five consecutive cycles. Structural characterizations revealed that the synergistic interplay between the acidic medium and the high dissolution capacity of the DES was crucial for generating a structurally robust material with markedly enhanced surface area and a high density of strong acid sites. In contrast, modification with either an acidic aqueous solution alone or a neutral binary DES (ZrOCl<sub>2</sub>–ethylene glycol) failed to achieve comparable improvements.</p>","PeriodicalId":519,"journal":{"name":"Coke and Chemistry","volume":"68 9","pages":"806 - 813"},"PeriodicalIF":0.5,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145808718","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}