Thermal Engineering最新文献

{"title":"Numerical Modeling of Heat Transfer during the Flow of Air and Helium–Xenon Mixture in a Seven-Rod Fuel Assembly","authors":"K. S. Lebeda,&nbsp;M. S. Makarov,&nbsp;V. S. Naumkin,&nbsp;O. V. Vitovsky","doi":"10.1134/S0040601525700831","DOIUrl":"10.1134/S0040601525700831","url":null,"abstract":"<p>The article presents a study, carried out using numerical methods, of heat transfer during the flow of gas mixtures in a heated seven-rod assembly containing cylindrical fuel elements with spacer grids. The fuel elements were made of thin-walled nichrome tubes; owing to a hollow design of fuel elements, it became possible to determine the wall temperature distribution along the assembly length. The grids were made so that all of its channels had the same hydraulic diameters. Helium–xenon (He‒Xe) mixture with the Prandtl number Pr = 0.23 and air with the Prandtl number Pr = 0.71 were considered as coolant. Data on the distribution of the central fuel element wall temperature were obtained, and the effect the spacer grids had on the local changes in the flow parameter and temperature was analyzed. The RANS modeling results were compared with the data of an experimental wall temperature investigation. The comparison results have shown that the predicted data are in good agreement with the experimental data: the maximal difference was equal to 7 К. It was shown that spacer grids gave rise to vortex connection zones upstream and downstream of them; local narrowing of the flow pass section inside the grid facilitated flow acceleration. When a change occurs in the flow dynamics near the grid, abrupt temperature jumps are observed, and it should be noted that air temperature jumps are higher than those of helium–xenon mixture. Thus, in the case of using He‒Xe mixture with the Prandtl number Pr = 0.23 as coolant, the temperature distribution in the assembly cross section becomes less nonuniform. It is shown that flow acceleration has an influence on the dependence of Nusselt number on the Reynolds number: with high pressure differences between the assembly inlet and outlet, gas accelerates to subsonic velocities, which results in flow core cooling.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"186 - 195"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733208","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 and Optimization of Heat Pump Water Heater with Wrapped-Tank Mini-Channel Condenser","authors":"Yanjun Li,&nbsp;Heng Liu,&nbsp;Luwen Qin,&nbsp;Shouhong Li","doi":"10.1134/S0040601524601025","DOIUrl":"10.1134/S0040601524601025","url":null,"abstract":"<p>The application of mini-channel condenser in the field of heat pump water heater (HPWH) introduces new challenges for design and modeling tools, as the two-phase flow mechanisms and flow regime transitions in mini-channel is considerably different from those found in the more conventional larger diameter tubes in the condensing process. Based on the latest research of mini-channel research, this study develops a coupled model that integrates a vapor-compression heat pump model with a water tank heat transfer model, linked through a bidirectional coupling algorithm. In this framework, the heat pump model supplies the tank model with heat flux boundary conditions, while the tank model returns water side parameters to the system model. This coupled approach enables the prediction of both system level performance and the transient hydrodynamics and heat transfer behavior within the water tank, thereby enhancing overall design and analysis capability. Model accuracy is evaluated experimentally using system efficiency, compressor suction and exhaust pressures, condenser inlet and outlet temperatures, evaporating temperature, and water tank temperature measurements. Furthermore, a variable-pitch mini-channel condenser is proposed, and HPWH configurations featuring constant and variable-pitch condensers are simulated. The results demonstrate that the variable-pitch design leads to a more uniform temperature distribution in the tank and yields superior performance in terms of both system efficiency and heat-transfer enhancement.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"196 - 209"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733210","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 Shell-and-Tube Condenser Design for an ORC Unit Operating on Pentane as Working Fluid","authors":"I. S. Antanenkova,&nbsp;A. A. Antanenkov,&nbsp;V. I. Kuznetsov,&nbsp;D. S. Pisarev","doi":"10.1134/S004060152570082X","DOIUrl":"10.1134/S004060152570082X","url":null,"abstract":"<p>Condensing devices constitute quite a bulky—in terms of overall dimensions and metal intensity—part of the thermal process circuit of power facilities implementing the organic Rankine cycle (ORC) during operation on various working fluids. In constructing such devices, it is very important to carry out rational designing, which can help make them with essentially better weight and overall dimension characteristics, and technical and economic indicators. This objective is of special importance for ORC facilities, because there is rather a small amount of commonly accessible information on the optimal structural design of such devices for each capacity level (output) of their equipment. The article presents the results of a computational study aimed at determining the effect the geometrical parameters of finned copper tubes have on the thermal, hydraulic, and mass and overall dimension characteristics of a shell-and-tube condenser for the ORC facility operating on pentane as working fluid for electrical capacities equal to 500 and 1000 kW. In carrying out the analysis, the optimal Rankine thermodynamic cycle parameters and the output of the devices in the nominal mode of their operation were determined. A specific feature relating to the solution of this research problem was the use of a systematic approach to analyzing the distribution of loads among the vapor generator parts (the heater and evaporator) in varying the saturation temperature in it and, hence, in changing the ORC facility efficiency and pentane flowrate. However, the major part of this work deals with the results of variant calculations of the shell-and-tube condenser operating on pentane as working fluid with using GEWA-K tubes produced by Wieland-Werke AG (Ulm, Germany). The calculations were carried out for devices having thermal capacities equal to 2280 and 5560 kW made using tubes having different diameter, wall thickness, and finning, of GEWA-K19, GEWA-K26, and GEWA-K40 types. The article presents the results of a study aimed at determining how the contamination of tube inner surface affects the condenser characteristics: key regularities have been revealed; device optimal design versions have been determined, and recommendations for the developers of the ORC facility shell-and-tube condensers have been formulated.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"159 - 167"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733213","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":"Cogeneration: Energy Efficiency of Competing Technologies","authors":"S. P. Filippov,&nbsp;M. D. Dilman","doi":"10.1134/S0040601525700867","DOIUrl":"10.1134/S0040601525700867","url":null,"abstract":"<p>The article proposes a methodology for carrying out a comparative analysis of the energy efficiency of combined (cogeneration) and separate arrangements for electricity and heat generation, which takes into account the operating characteristics of different cogeneration unit classes [steam turbine units (STU), gas turbine units (GTU), and combined cycle units (CCU)], as well as the regional climatic conditions of their operation. By using the developed calculation tool, it is possible to determine key indicators such as relative annual fuel saving, coefficient of fuel utilization (CFU), and capacity factor (CF). The study was carried out for a wide range of the capacities of gas units (10–230 MW) and for a coal fired STU (100 MW) with taking into account the characteristics of regional power systems at the places of possible use of cogeneration units. It is shown that cogeneration is an efficient method for saving fuel and reducing greenhouse gas emissions under the currently existing conditions, and with the expected improvement in the efficiency of separate electricity and heat generation. Currently, the use of GTUs and STUs for cogeneration purposes can save 19–37% of fuel, and that of CCUs, up to 28–44% depending on the regional and climatic conditions. Even if we take a hypothetical case of achieving average annual efficiency equal to 55% in the separate arrangement of electricity and heat generation at fossil fueled power plants, the fuel saving due to cogeneration still remains positive, although it will decrease to make from 1 to 11% in the case of using steam turbine and gas turbine units, and 6–19% in the case of using combined cycle units. It has been determined that the best prospects for use will be for cogeneration units featuring high electricity generation efficiency, also during operation at partial loads, and also with a wide thermal power adjustment range. The obtained conclusions and developed techniques can be used for substantiating the choice of technologies in designing and modernizing combined heat and power plants, and in elaborating programs for development of thermal power facilities in regions with different climatic conditions.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"210 - 225"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733212","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":"Control of Bulk Condensation Intensity in a Radial Cooling Turbine Stage by Means of Frequency Control","authors":"A. A. Sidorov,&nbsp;A. K. Yastrebov","doi":"10.1134/S0040601525700843","DOIUrl":"10.1134/S0040601525700843","url":null,"abstract":"<p>The study is concerned with numerical simulation of carbon dioxide (СО₂) bulk condensation from its mixture with air in the flow path of a two-phase turbine machine (a turboexpander unit (TEU)) in 3D statement with using a CFD software package and the Bulk Condensation dedicated computation module. The purpose of the study is to determine the effectiveness of frequency control and its influence of the phase transition process in the turbine machine stage. The main objective of the work is to reveal the optimal operation conditions under which moisture droplets emerge and grow predominantly in the impeller channels, which corresponds to the conditions of unlikely erosion destruction of its flow path components. It is shown by calculation that by varying the TEU impeller rotation frequency it is possible to control the bulk condensation process in the radial turbine flow path. The maximal impurity condensation degree—subject to the selected constraints—that can be reached in the flow path makes more than 96% with the maximal expansion ratio equal to 6.17 and the СО₂ content in the mixture flow equal to 10 wt %. It is shown that by comprehensively varying the control parameters (expansion ratio, flow temperature, and impeller rotation frequency) it is possible to adjust the bulk condensation process intensity and also “shift” the phase transition location from the guide vane to the impeller without loss of high condensation degree and particles having sizes minimally acceptable for subsequent separation. It has been found that with increasing the impeller rotation frequency, the condensation intensity in the guide vane decreases quite rapidly, as a consequence of which this process takes place in the impeller, a circumstance that makes it possible to avoid destruction of its components under the effect of droplet impingement erosion. The simulation results are in qualitative agreement with the experimental and calculated data reported in literature sources. As regards quantitative correspondence, its assessment is rather difficult because there is lack of detailed flow path drawings, in view of which it is not possible to carry out numerical simulation.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"174 - 185"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733214","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":"The JIHT RAS Cycle—a New Approach to Combined Electricity and Heat Generation with Complete Carbon Dioxide Capture from Combustion Products","authors":"A. A. Kosoi,&nbsp;A. S. Kosoi,&nbsp;A. V. Krysov,&nbsp;O. S. Popel’,&nbsp;M. V. Sinkevich,&nbsp;S. P. Filippov","doi":"10.1134/S0040601525700880","DOIUrl":"10.1134/S0040601525700880","url":null,"abstract":"<p>The use of power facilities operating on the basis of the innovative thermodynamic cycle developed at the Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS) opens the possibility of implementing a new approach to determining the list of thermal power plant equipment at the construction stage with ensuring independent control of electricity and heat generation in a wide range, and discarding the use of peaking hot water boilers and peaking electricity generating capacities. The article presents, taking a hypothetical local power system as an example, a comparative analysis of the efficiencies of the proposed and alternative typical versions of supplying heat and electricity to a settlement in Central Russia with a population of half million people. The performed calculation and theoretical investigations have shown that the proposed version features higher thermodynamic efficiency and the possibility of decreasing the annual fuel consumption by 20–30%. The comparison was carried out without taking into account the energy consumption in the alternative versions for capturing the carbon dioxide (СО₂) produced as a result of fuel combustion. The JIHT RAS thermodynamic cycle employs the oxygen fuel combustion technology, and carbon dioxide is removed from the cycle in liquid form convenient for subsequent СО₂ sequestration/disposal. The conventional units will also have to be equipped with an expensive carbon dioxide capturing system and additional energy expenditures for supporting the operation of this system. Owing to the reduced amount of fuel combusted by thermal power plants furnished with the proposed equipment, they will produce a smaller thermal release. With the use of oxygen fuel combustion, the power equipment will not generate nitrogen oxide, which is harmful for human health and detrimental for the Earth ozone layer. Better maneuverability of the proposed equipment and the possibility to operate at deeply decreased partial loads with high thermal efficiency will serve as a pledge for efficient operation of this equipment jointly with facilities on the basis of renewable energy sources (wind and sun).</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"147 - 158"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733209","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":"Determination of Swirl Flow Characteristics in the Laboratory Model of a Cyclone-Vortex Furnace Extension","authors":"K. A. Shtym,&nbsp;T. A. Solov’eva,&nbsp;A. V. Kulik,&nbsp;E. V. Bazilevich","doi":"10.1134/S0040601525700879","DOIUrl":"10.1134/S0040601525700879","url":null,"abstract":"<p>The article describes the laboratory model of an air cooled cyclone-vortex furnace extension (CVFE) for a capacity of around 30 kW, which is a reduced copy of a gas and fuel oil fired CVFE for a capacity of 65 MW, and the operation principles of CVFE assemblies and components are considered. One of the laboratory model features is the possibility to carry out experimental investigations during the gaseous fuel combustion in the furnace extension. Systems for adjusting the height of tangential air nozzles and the position of gas nozzle inlets are implemented for the first time. Unlike industry-grade CVFEs, the laboratory CVFE model is made without refractory lining of the combustion chamber (CC). Owing to this solution, it is possible to estimate the influence of the combustion process on the structural elements and heat transfer conditions in different furnace extension operation modes. Numerous investigations carried out on the laboratory model have demonstrated the possibility to ensure a wide range of CVFE loads and operation mode adjustment. The article presents research modes, in which the static and dynamic pressures, velocity vector direction, and swirl flow temperature were determined using the pneumometric method. The study results are given in graphic form. The variation profile of the full velocity tangential component of the flow swirled in the CVFE model is analyzed. The variations over the CC radius of the profiles of dimensionless tangential velocities and the profiles of dimensionless circulations of swirled flow velocity obtained on the laboratory model and on the industry-grade CVFE are compared with each other. The relative Rossby number <span>(overline {{text{Ro}}} )</span> of the laboratory and industry-grade CVFEs amounted to 2.67. An analysis of the obtained data of aerodynamic investigations will make it possible to develop new design solutions for the laboratory CVFE model, carry our full-valued fire experiments with it, and in the case of obtaining positive results, introduce the necessary modifications in the industry-grade CVFE.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 3","pages":"168 - 173"},"PeriodicalIF":1.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733207","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":"Calculation Relationships for Determining the Sizes of Detachment Bubbles Formed on Perforated Plates Having Different Geometrical Parameters and with Different Two-Phase Layer Heights","authors":"V. A. Devyanin","doi":"10.1134/S0040601525700764","DOIUrl":"10.1134/S0040601525700764","url":null,"abstract":"<p>Perforated plates have found wide use in devices installed at thermal and nuclear power plants, and at chemical and petroleum and gas industry enterprises as submersed steam or gas distribution devices, and devices for gas phase dispersion into a low layer of liquid above them, in which processes of heat and mass transfer, or removal of finely dispersed droplet moisture from steam take place. For modeling the hydrodynamic processes occurring in a two-phase layer, it is important to be able to evaluate the average diameter of bubbles formed at the perforated plate holes and the bubble size distribution in terms of their sizes depending on the two-phase medium physical properties, perforated plate geometrical sizes, and two-phase layer height. However, despite numerous investigations, there are still no experimentally verified relationships for determining the sizes of bubbles formed at the perforated plate holes at the gas velocities typical for industrial installations and at a shall two-phase layer height. The article expands the application domain of their relationships for the detached bubbles formed at single submerged holes, also at a high steam pressure characteristic of devices used in the power industry. In addition, formulas have been proposed for the first time, using which it is possible to calculate the average sizes of detached bubbles and bubble size distributions for perforated plates having different geometrical parameters and with different heights of the two-phase layer above them. Experimental data deviate from the calculated values of detached bubble diameters for perforated plates by no more than 10%, and the average absolute deviations make no more than 3%.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 2","pages":"107 - 120"},"PeriodicalIF":1.0,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606939","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":"A New Concept of a Power Generating Facility with Integrated Carbon Dioxide Capture and Cryogenic Energy Storage","authors":"A. A. Kosoi,&nbsp;A. V. Krysov,&nbsp;O. S. Popel’,&nbsp;S. P. Filippov","doi":"10.1134/S0040601525700818","DOIUrl":"10.1134/S0040601525700818","url":null,"abstract":"<p>The article presents the concept of a combined cycle turbine unit based on the innovative thermodynamic cycle developed at the Joint Institute for High Temperatures of the Russian Academy of Sciences (JIHT RAS) with integrated carbon dioxide (СО₂) capture and cryogenic energy storage. The developed cycle relates to the class of semi-closed cycles, but retains all advantages of open and closed cycles. Owing to a wide range in which the power unit electrical and thermal power outputs can be adjusted, units implemented on the basis of the JIHT RAS thermodynamic cycle can efficiently participate in covering the electric and thermal load curves. Owing to the use of working fluid initial components (fuel, oxidizer, and ballasting carbon dioxide and water) in liquid state, it becomes possible to do without compressor equipment and replace it with pumps, thereby reducing energy consumption for plant auxiliaries and decreasing the required capital outlays. Due to the use of oxygen fuel combustion, it becomes possible to implement integrated carbon dioxide capture and prevent its emission into the atmosphere almost completely. Owing to the fact that the heat releasing during steam condensation and the carbon dioxide generated during fuel combustion both return into the cycle, it becomes possible to achieve extremely high efficiency of using the fuel energy in the plant (95% or higher with the plant operating in the cogeneration mode). Owing to the availability of large volumes of cryogenic liquids (air separation products and liquefied natural gas), it becomes possible to implement, on their basis, integrated energy storage based on the phase transition energy. Since cryogenic liquids and equipment for obtaining them are integral components of the power unit process circuit, this makes it possible to compensate for the drawbacks inherent in the cryogenic energy storage method. As a result, a dual effect can be obtained in one unit: carbon dioxide capture and energy storage. The presented combined cycle turbine unit on the basis of the JIHT RAS cycle opens possibilities for retaining large-scale use of organic fuels with simultaneously solving the economy decarbonization problems.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 2","pages":"71 - 80"},"PeriodicalIF":1.0,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606862","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":"Recycling of Coal Preparation Plant Production Waste to Obtain Fuel Briquettes","authors":"K. Yu. Ushakov,&nbsp;E. A. Eremeev,&nbsp;E. Yu. Temnikova","doi":"10.1134/S004060152570079X","DOIUrl":"10.1134/S004060152570079X","url":null,"abstract":"<p>The article considers a pressing problem of recycling coal sludge (cake), which is one of the main production waste kinds generated in the course of coal preparation. According to assessments, the annual amount of cake generated in Russia makes around 300–650 thousand t. The study considers the prospects for making fuel briquettes from cake without the addition of binding substances, but with the use of wood sawdust as a component absorbing moisture from the surface of cake particles. Such component is necessary because in molding a briquette in the mold, the water phase separates from the cake. The technical characteristics of wet coal cake produced at the Severnaya Coal Preparation Plant (CPP) operated by the Northern Kuzbass Coal Company were determined: the cake moisture content is 44.71%, yield of volatiles is 14.3%, ash content is 47.35%, and higher heating value is 17.67 MJ/kg. With due regard to the experimental and theoretical study results, briquettes from cake are made without additional thermal drying, which have a mechanical drop strength of not lower than 95% and meet the transportation requirements. Formulations for briquetting are selected, and the relationship between the cake moisture content and the required amount of moisture absorbing component is shown. In the case of using cake with the initial moisture content that has not been subjected to pre-drying, it is recommended to use the composition with the cake to sawdust ratio equal to 95/5 wt %. With such composition, the briquettes have the minimal content of sawdust, due to which they feature an increased ash content of 42–45% and a moderate yield of volatiles of 17.3–18.5%. It is shown that mold preheating to 80–100°С helps make briquettes less prone to deformation when subjected to a mechanical impact. The obtained fuel briquettes can be used in the power industry and in public utilities as fuel for boiler facilities and household furnaces.</p>","PeriodicalId":799,"journal":{"name":"Thermal Engineering","volume":"73 2","pages":"91 - 97"},"PeriodicalIF":1.0,"publicationDate":"2026-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147606940","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}