The aim of the work is computer simulation of the formation of nitrogen oxides in the furnace of the boiler TPP 312 with the swirl of the primary air in the boiler burners. The organization of the vortex flow allows reducing the generation of nitrogen oxides due to the formation of a return flow, which ballasts the combustion zone by oxidation products. The limitation of this technique is the reduction of the combustion temperature which can lead to underburning. The objective of the study is to determine the formation of nitrogen oxides based on computer simulation of the gas dynamics of the firing space of the boiler TPP 312 DTEK Ladyzhyn TES when swirling streams of air are used in the burner channels. Efficient combustion of fuel, in particular solid, is ensured by three factors: mixing of the fuel and the oxidizing agent, residence time in the temperature zone necessary for the combustion of fuel particles and temperature. The selection of the parameter is under pressure from requirements operating in opposite directions. On the one hand, a higher temperature contributes to better fuel burning, but, on the other hand, the formation of nitrogen oxides increases at a higher temperature. Analysis of the data on the quality of coal that comes to the station made it possible to derive the averaged characteristics of coal that were used to improve the combustion model of the software package. Conclusions In the presence of swirling flow, the maximum temperature is 108 K lower than in the case of a direct-flow burner, which causes a 5% reduction in the generation of nitrogen oxides. Centrifugal flows created a rarefaction zone at the burner axis and the reaction products begin to heat the fuel mixture in the burner itself. The surface area of the beginning of combustion during the application of twisting reduces by 30%. The results of the study showed that the twisting of the primary air does not lead to a significant reduction of nitrogen oxides.
{"title":"SLOW-UP GENERATION OF NITROGEN OXIDES BY TURNING THE PRIMARY AIR FLOW IN THE SWIRL BURNER OF THE BOILER TPP 312","authors":"S. Kobzar, G. Kovalenko, A. Khalatov","doi":"10.31472/ttpe.4.2019.7","DOIUrl":"https://doi.org/10.31472/ttpe.4.2019.7","url":null,"abstract":"The aim of the work is computer simulation of the formation of nitrogen oxides in the furnace of the boiler TPP 312 with the swirl of the primary air in the boiler burners. The organization of the vortex flow allows reducing the generation of nitrogen oxides due to the formation of a return flow, which ballasts the combustion zone by oxidation products. The limitation of this technique is the reduction of the combustion temperature which can lead to underburning. \u0000The objective of the study is to determine the formation of nitrogen oxides based on computer simulation of the gas dynamics of the firing space of the boiler TPP 312 DTEK Ladyzhyn TES when swirling streams of air are used in the burner channels. \u0000Efficient combustion of fuel, in particular solid, is ensured by three factors: mixing of the fuel and the oxidizing agent, residence time in the temperature zone necessary for the combustion of fuel particles and temperature. The selection of the parameter is under pressure from requirements operating in opposite directions. On the one hand, a higher temperature contributes to better fuel burning, but, on the other hand, the formation of nitrogen oxides increases at a higher temperature. \u0000Analysis of the data on the quality of coal that comes to the station made it possible to derive the averaged characteristics of coal that were used to improve the combustion model of the software package. \u0000Conclusions \u0000In the presence of swirling flow, the maximum temperature is 108 K lower than in the case of a direct-flow burner, which causes a 5% reduction in the generation of nitrogen oxides. Centrifugal flows created a rarefaction zone at the burner axis and the reaction products begin to heat the fuel mixture in the burner itself. The surface area of the beginning of combustion during the application of twisting reduces by 30%. \u0000The results of the study showed that the twisting of the primary air does not lead to a significant reduction of nitrogen oxides.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74062265","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}
Changes in the design of critical critical from the point of view of safety of the nodes of the main circulation pumps of nuclear power units and the corresponding dynamics of the accompanying thermo-hydraulic problems caused by these changes are analyzed. Attention is drawn to the insufficiently studied complex thermophysical processes occurring in tribological pairs of mechanical shaft sealing and sliding bearings, where the normal friction and lubrication conditions can latently go to pre-emergency and insufficiently controlled by existing monitoring systems technical conditions.
{"title":"EVOLUTION OF THERMOPHYSICAL PROBLEMS IN CONSTRUCTIONS OF VVER REACTORS MAIN CIRCULATION PUMPS","authors":"G. Sharaevsky, N. Fialko, I. Sharaevsky, L. Zimin","doi":"10.31472/ttpe.3.2019.7","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.7","url":null,"abstract":"Changes in the design of critical critical from the point of view of safety of the nodes of the main circulation pumps of nuclear power units and the corresponding dynamics of the accompanying thermo-hydraulic problems caused by these changes are analyzed. Attention is drawn to the insufficiently studied complex thermophysical processes occurring in tribological pairs of mechanical shaft sealing and sliding bearings, where the normal friction and lubrication conditions can latently go to pre-emergency and insufficiently controlled by existing monitoring systems technical conditions.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87727151","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}
We present the results of technical – and – economical analysis showing that the most efficient fuel from biomass for thermal power engineering is bio carbon, which is produced with the help of industrial facility developed and manufactured at the Institute of Engineering Thermophysics of Ukrainian National Academy of Sciences.
{"title":"BIOCARBON AS AN EFFECTIVE SOLID FUEL FROM BIOMASS","authors":"E. V. Sklyarenko, R. Serhiienko","doi":"10.31472/ttpe.3.2019.12","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.12","url":null,"abstract":"We present the results of technical – and – economical analysis showing that the most efficient fuel from biomass for thermal power engineering is bio carbon, which is produced with the help of industrial facility developed and manufactured at the Institute of Engineering Thermophysics of Ukrainian National Academy of Sciences.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90088351","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}
The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.
{"title":"Comprehensive analysis of transfer processes in modern high-temperature heat exchangers","authors":"B. Soroka, V. Zgurskyi","doi":"10.31472/ttpe.3.2019.4","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.4","url":null,"abstract":"The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"186 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72802168","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}
A developed and implemented project of replacing a universal boiler with a fuel oil burner for a dual-circuit solar installation for hot water supply and a «ground-water» heat pump for heating a private house is presented. A system automation scheme has been developed using a workstation and technical automation tools have been selected.
{"title":"INTEGRATION OF THE HEAT PUMP HEAT EXCHANGE PROCESS FOR HOT WATER SUPPLY AND HEATING","authors":"Yu. A. Selikhov, V. Kotsarenko, O. V. Kostenko","doi":"10.31472/ttpe.3.2019.6","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.6","url":null,"abstract":"A developed and implemented project of replacing a universal boiler with a fuel oil burner for a dual-circuit solar installation for hot water supply and a «ground-water» heat pump for heating a private house is presented. A system automation scheme has been developed using a workstation and technical automation tools have been selected.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74704278","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}
The results of theoretical studies of the environmental characteristics of fire-engimeering objects and their interrelation with the working process of the burner device are presented. The results of practical use of the new burner devices based on the stream-niche technology of gas fuel combustion for modernization of municipal power engineering are presented. The data are shown in order to increase the efficiency and reduce the environmental influence of engineering gasburning objects and the process of generating energy in general.
{"title":"INTERRELATION OF WORKING PROCESS OF THE BURNET DEVICE BASED ON STREAM-NICHE TECHNOLOGY OF GAS BURNING WITH ENVIRNMENTAL ASPECTS OF FIREENGINEERING OBJECT’S WORK","authors":"M. Abdulin, K. Horban, O. A. Siryy","doi":"10.31472/ttpe.3.2019.9","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.9","url":null,"abstract":"The results of theoretical studies of the environmental characteristics of fire-engimeering objects and their interrelation with the working process of the burner device are presented. The results of practical use of the new burner devices based on the stream-niche technology of gas fuel combustion for modernization of municipal power engineering are presented. The data are shown in order to increase the efficiency and reduce the environmental influence of engineering gasburning objects and the process of generating energy in general.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"94 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83571376","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}
G. Geletukha, T. Zheliezna, S. Drahniev, A. Bashtovyi
The place of biomass of agrarian origin in the potential of biomass for energy in Ukraine is considered. The views of national and foreign experts on the possibility of partial removal of crop residues from the field are presented. The technological barriers to using agribiomass for energy are analyzed. The ways of overcoming these barriers are proposed.
{"title":"ANALYSIS OF BARRIERS TO THE PRODUCTION OF ENERGY FROM AGRIBIOMASS IN UKRAINE. PART 1","authors":"G. Geletukha, T. Zheliezna, S. Drahniev, A. Bashtovyi","doi":"10.31472/ttpe.3.2019.11","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.11","url":null,"abstract":"The place of biomass of agrarian origin in the potential of biomass for energy in Ukraine is considered. The views of national and foreign experts on the possibility of partial removal of crop residues from the field are presented. The technological barriers to using agribiomass for energy are analyzed. The ways of overcoming these barriers are proposed.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"99 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88536089","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}
N. Fialko, A. Stepanova, R. Navrodskaya, G. Presitsh
Викладено результати дослідження втрат ексергетичної потужності в повітронагрівачітеплоутилізаційної системи котельної установки і розглянуто закономірності впливу на зазначені втрати коефіцієнта тепловіддачі від стінки до повітря.
{"title":"LOSSES OF EXERGETIC CAPACITY IN THE AIR HEATER OF THE HEAT-UTILIZATION SYSTEM OF THE BOILER INSTALLATION.","authors":"N. Fialko, A. Stepanova, R. Navrodskaya, G. Presitsh","doi":"10.31472/ttpe.3.2019.2","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.2","url":null,"abstract":"Викладено результати дослідження втрат ексергетичної потужності в повітронагрівачітеплоутилізаційної системи котельної установки і розглянуто закономірності впливу на зазначені втрати коефіцієнта тепловіддачі від стінки до повітря.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"267 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72720425","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}
N. Kobasko, A. Moskalenko, P. N. Logvinenko, V. Dobryvechir
It is shown that in contrast to well known surface active additives (SAA), affecting physical properties of a liquid, the elimination of film boiling during quenching is achieved by creation of the thin polymeric layer on the surface of hardened metal. It is performed by using special polymers of optimal concentration in water. The obtained insulating polymeric layer decreases initial heat flux density below its critical value and by this way eliminates completely the film boiling without affecting clearly the physical properties of a liquid. Based on this fact and on the principle of decreasing distortion, quench crack formation, and increasing strength of material during intensive quenching, it is proposed to use low concentration of special polymers instead of their high concentration in water. All of this results in significant strengthening of metal, saves costly materials, and increases service life of hardened products.
{"title":"NEW DIRECTION IN LIQUID QUENCHING MEDIA DEVELOPMENT","authors":"N. Kobasko, A. Moskalenko, P. N. Logvinenko, V. Dobryvechir","doi":"10.31472/ttpe.3.2019.5","DOIUrl":"https://doi.org/10.31472/ttpe.3.2019.5","url":null,"abstract":"It is shown that in contrast to well known surface active additives (SAA), affecting physical properties of a liquid, the elimination of film boiling during quenching is achieved by creation of the thin polymeric layer on the surface of hardened metal. It is performed by using special polymers of optimal concentration in water. The obtained insulating polymeric layer decreases initial heat flux density below its critical value and by this way eliminates completely the film boiling without affecting clearly the physical properties of a liquid. Based on this fact and on the principle of decreasing distortion, quench crack formation, and increasing strength of material during intensive quenching, it is proposed to use low concentration of special polymers instead of their high concentration in water. All of this results in significant strengthening of metal, saves costly materials, and increases service life of hardened products. \u0000 ","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79390132","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}
The results of experimental studies of the specific heat of crystallization of polymer composites based on polyethylene filled with copper microparticles are presented. Data concerning the effects on the crystallization heat of the studied composites on such factors as the mass fraction of the filler and the cooling rate of the composites from the melt are presented. The corresponding studies were performed with a change in the mass fraction of the filler from 0.3% to 4.0% and the cooling velocity of the microcomposite from the melt from 1 K/min to 20 K/min. It is shown that the specific heat of crystallization decreases significantly with increasing speed VT and the mass fraction of the filler ω. The results of the comparison of the values of the specific heat of crystallization of polymer microcomposite, obtained by a method based on the mixing of components in a dry form and in a polymer melt, are presented. It was established that the first of the indicated methods correspond to large values of the heat of crystallization.
{"title":"CRYSTALLIZATION HEAT OF HIGH HEAT CONDUCTING POLYMER COMPOSITES BASED ON POLYETHYLENE FILLED WITH COPPER MICROPARTICLES","authors":"N. Fialko, R. Dinzhos, N. Koseva","doi":"10.31472/TTPE.2.2019.3","DOIUrl":"https://doi.org/10.31472/TTPE.2.2019.3","url":null,"abstract":"The results of experimental studies of the specific heat of crystallization of polymer composites based on polyethylene filled with copper microparticles are presented. Data concerning the effects on the crystallization heat of the studied composites on such factors as the mass fraction of the filler and the cooling rate of the composites from the melt are presented. The corresponding studies were performed with a change in the mass fraction of the filler from 0.3% to 4.0% and the cooling velocity of the microcomposite from the melt from 1 K/min to 20 K/min. It is shown that the specific heat of crystallization decreases significantly with increasing speed VT and the mass fraction of the filler ω. The results of the comparison of the values of the specific heat of crystallization of polymer microcomposite, obtained by a method based on the mixing of components in a dry form and in a polymer melt, are presented. It was established that the first of the indicated methods correspond to large values of the heat of crystallization.","PeriodicalId":23079,"journal":{"name":"Thermophysics and Thermal Power Engineering","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84531702","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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