S. Chernov, V. Prokhorov, V. Aparov, M. V. Fomenko
{"title":"The Influence of Burning Ratios Based on Coal Characteristics on its Combustion in the Boiler Furnace","authors":"S. Chernov, V. Prokhorov, V. Aparov, M. V. Fomenko","doi":"10.52254/1857-0070.2024.3-63.04","DOIUrl":"https://doi.org/10.52254/1857-0070.2024.3-63.04","url":null,"abstract":"The need of switch to burn non-design fuel arises during the thermal power plants long-term operation. The choice of replacing coal is quite complicated and currently being solved by various non-design fuels experimental combustion on a specific power boiler. The aim of the work is to develop criteria assessing non-design coal burning possibility in a specific furnace before experimental combustion. The stated goal is achieved with the help of numerical combustion modeling regarding various coals at the pre-critical parameters boiler furnace with an average composition ranking by the lower calorific value. 2 burning ratios have been proposed based on foreign experience: the fuel ratio and the degree of fuel burnout. The first is the ratio of the fuel carbon to volatile substances contents, which in this work are taken as an analytical mass. The second is calculated with the proposed formula, which, instead of the combustible content in fly ash, use mechanical underburning widely included in the technical calculations. Combustion zones with the degree of the acceptable fuel burnout according to the standards and with its excess are distinguished. The limit of possible coal combustion according to the fuel coefficient is found as well. It is shown that this furnace is quite universal for burning a wide range of coals, although it was originally designed for burning brown coal. It is not recommended to burn only lean and low-caking bituminous coals, anthracites and brown coals with calorific value less than 11.5 MJ/kg or humidity more than 40%. The obtained results are significant for the preliminary assessment of non-design fuel combustion and narrowing the range of fuels under consideration. Other the boiler conversion consequences for non-design fuel should be taken into account for the final decision, and above all, the probability of the heating surfaces slagging.","PeriodicalId":513446,"journal":{"name":"Problems of the Regional Energetics","volume":"2019 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141851444","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":"Formation of Energy Supply Systems for Special Economic Zones","authors":"F. Byk, E. M. Ivanova, L. Myshkina","doi":"10.52254/1857-0070.2024.3-63.05","DOIUrl":"https://doi.org/10.52254/1857-0070.2024.3-63.05","url":null,"abstract":"The need of switch to burn non-design fuel arises during the thermal power plants long-term operation. The choice of replacing coal is quite complicated and currently being solved by various non-design fuels experimental combustion on a specific power boiler. The aim of the work is to develop criteria assessing non-design coal burning possibility in a specific furnace before experimental combustion. The stated goal is achieved with the help of numerical combustion modeling regarding various coals at the pre-critical parameters boiler furnace with an average composition ranking by the lower calorific value. 2 burning ratios have been proposed based on foreign experience: the fuel ratio and the degree of fuel burnout. The first is the ratio of the fuel carbon to volatile substances contents, which in this work are taken as an analytical mass. The second is calculated with the proposed formula, which, instead of the combustible content in fly ash, use mechanical underburning widely included in the technical calculations. Combustion zones with the degree of the acceptable fuel burnout according to the standards and with its excess are distinguished. The limit of possible coal combustion according to the fuel coefficient is found as well. It is shown that this furnace is quite universal for burning a wide range of coals, although it was originally designed for burning brown coal. It is not recommended to burn only lean and low-caking bituminous coals, anthracites and brown coals with calorific value less than 11.5 MJ/kg or humidity more than 40%. The obtained results are significant for the preliminary assessment of non-design fuel combustion and narrowing the range of fuels under consideration. Other the boiler conversion consequences for non-design fuel should be taken into account for the final decision, and above all, the probability of the heating surfaces slagging.","PeriodicalId":513446,"journal":{"name":"Problems of the Regional Energetics","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141843868","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":"Regulation Transformer with Extended Control Range","authors":"D. Zaitsev, I. Golub, M. Tirsu, D. Caloshin","doi":"10.52254/1857-0070.2024.3-63.12","DOIUrl":"https://doi.org/10.52254/1857-0070.2024.3-63.12","url":null,"abstract":"The paper deals with research of the booster transformer (regulation transformer), which can be attributed to “Sen” family, which has an extended range and higher control accuracy. The main aim of the paper is to study both operational and energy characteristics of the transformer device that implements output voltage longitudinal-transverse regulation principle relative to the input based on power electronics. The most significant research results can be considered new developed circuit design and method for windings sectioning, including their regulating control strategy. The obtained computational experiments results based on developed structural simulation models of the booster transformer demonstrated effectiveness of the proposed device technical solution and its control strategy in terms of significant expansion of the output voltage range both in magnitude and in phase. It is shown that the proposed technical solution provides greater possibilities for phase voltage regulation (relative to the UPFC and “Sen” transformer) with the same restrictions on the longitudinal and transverse components of the boost voltage. Vector diagrams of the studded device were constructed and expressions characterizing its operating parameters were obtained. The characteristics of the device parameters variation in both idle and load mode were obtained and analyzed. The significance of the obtained results consisting in fact, that the proposed technical solution is capable to provide the same control actions in the form of an adjustable additional voltage as FACTS controllers such as UPFC and “Sen” - transformer, but on a simpler basis that is more accessible to practical implementation.","PeriodicalId":513446,"journal":{"name":"Problems of the Regional Energetics","volume":"93 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845388","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":"Determining the Idle Mode of the Last Stages of Powerful Steam Turbines for Wet Steam Area","authors":"D.O. Senetskaya, A.V. Senetskyi","doi":"10.52254/1857-0070.2024.3-63.10","DOIUrl":"https://doi.org/10.52254/1857-0070.2024.3-63.10","url":null,"abstract":"Increasingly, low-capacity electricity generating installations using renewable energy sources are becoming widespread. They bring imbalance to the energy system. Frequency control is carried out using powerful steam turbines. To ensure reliable and efficient operation of powerful steam turbines, it is important to understand the processes occurring in the last stages of the low pres-sure cylinder. At present, there is no approach to determining the idle mode (the moment of transition from the generation of mechanical power to its consumption) for large fanning stages. The purpose of the work is to develop an approach to estimating the relative volumetric steam flow rate of steam for large fanning stages, which characterizes the idle mode. This goal is achieved by developing a dependence to determine the idle mode for large fanning stages at nominal operating mode in a compressible medium using the results of an experimental study of model stages for high power turbines. The most important result is the satisfactory agreement between the values of volume flow rate obtained during the calculation, using the proposed method, with experimentally studies for the T-250/300-240 turbine last stage. The calculation error is about 3%. The significance of the results obtained is that the proposed approach allows determining the idle mode of the low pressure cylinder stages of steam turbines quickly and ac-curately during operation and design, which makes it possible to increase the efficiency and reli-ability of power units.","PeriodicalId":513446,"journal":{"name":"Problems of the Regional Energetics","volume":"103 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141842224","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. Tymochko, О. Sotnikov, S. Dudchenko, D. Makarchuk, A. Zazirnyi, О. Kolodiazhnyi
{"title":"Development of a Virtual Environment for Monitoring Underwater Electrical Cables by an Autonomous Underwater Vehicle Based on Fuzzy Cellular Automata","authors":"O. Tymochko, О. Sotnikov, S. Dudchenko, D. Makarchuk, A. Zazirnyi, О. Kolodiazhnyi","doi":"10.52254/1857-0070.2024.3-63.11","DOIUrl":"https://doi.org/10.52254/1857-0070.2024.3-63.11","url":null,"abstract":"The object of the study is to enhance operational efficiency and reduce fuel consumption of autonomous underwater vehicles during the monitoring of underwater electrical and optical cables based on FCA under conditions of uncertainty. To achieve the goal of the research fuzzy cellular automata are used, combining the advantages inherent in traditional cellular automata and provided by the capabilities of fuzzy sets and fuzzy logic. The cable location uncertainty is caused by possible earthquakes, turbulent currents, random impacts of anchors or fishing gear, cable fouling by marine vegetation and terrorist attacks. The developed approach allows to synthesise a Pareto-optimal vehicle route along the estimated coordinates of the object of study, providing minimum fuel consumption for minimum cable inspection time and satisfying the given system of constraints. Formal models are based on the use of fuzzy cellular automata, which are used to describe the three-dimensional model of the operating environment, zones and objects that hinder or limit the movement, and the behaviour of the underwater vehicle. The most significant results are the formal description of the problem solution space, and the method of modelling the route of an autonomous underwater vehicle in space to improve the efficiency and quality of the solution of the problem of monitoring the state of the object of interest. The significance of the results obtained is the possibility of solving a complex multi-criteria optimisation problem of finding the route of an autonomous underwater vehicle to monitor the cable system in three-dimensional space.","PeriodicalId":513446,"journal":{"name":"Problems of the Regional Energetics","volume":"52 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141847755","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}
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