Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991593
Sevgi Erzen, E. Açıkkalp, A. Hepbasli
Primary energy sources, fossil fuels mostly, have been depleting and not only in industrial and commercial sectors, but also in residential applications affect negatively the environment. One of the important solutions to these problems depends on renewable energy usage widely. One has focused on renewable energy-based multigeneration systems in the last decade. In this paper, a solar driven multigeneration system is introduced and the simulation of this system is performed by using TRNSYS 18. The proposed system includes PV-T and PV panels, a solid oxide fuel cell (SOFC), an electrolyzer, a hydrogen compressor, a hydrogen storage tank, a generator, a gas turbine cycle, batteries, an air-cooled chiller, an absorption chiller, hydrogen combustors, a water storage tank, a heat exchanger and control systems. In this system, the producing heat, cooling, electricity and hydrogen are designed. This system is considered to be located in Izmir, which is the third biggest in Turkey by population and the performance of the system is analyzed over a period of one year.
{"title":"Design and Analysis of a Novel Solar Driven Multigeneration System for Providing Energy Requirement of A Building","authors":"Sevgi Erzen, E. Açıkkalp, A. Hepbasli","doi":"10.1109/IYCE45807.2019.8991593","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991593","url":null,"abstract":"Primary energy sources, fossil fuels mostly, have been depleting and not only in industrial and commercial sectors, but also in residential applications affect negatively the environment. One of the important solutions to these problems depends on renewable energy usage widely. One has focused on renewable energy-based multigeneration systems in the last decade. In this paper, a solar driven multigeneration system is introduced and the simulation of this system is performed by using TRNSYS 18. The proposed system includes PV-T and PV panels, a solid oxide fuel cell (SOFC), an electrolyzer, a hydrogen compressor, a hydrogen storage tank, a generator, a gas turbine cycle, batteries, an air-cooled chiller, an absorption chiller, hydrogen combustors, a water storage tank, a heat exchanger and control systems. In this system, the producing heat, cooling, electricity and hydrogen are designed. This system is considered to be located in Izmir, which is the third biggest in Turkey by population and the performance of the system is analyzed over a period of one year.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125344003","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991564
M. Ireshika, M. Preißinger, P. Kepplinger
The electricity demand due to the increasing number of EVs presents new challenges for the operation of the electricity network, especially for the distribution grids. The existing grid infrastructure may not be sufficient to meet the new demands imposed by the integration of EVs. Thus, EV charging may possibly lead to reliability and stability issues, especially during the peak demand periods. Demand side management (DSM) is a potential and promising approach for mitigation of the resulting impacts. In this work, we developed an autonomous DSM strategy for optimal charging of EVs to minimize the charging cost and we conducted a simulation study to evaluate the impacts to the grid operation. The proposed approach only requires a one way communicated incentive. Real profiles from an Austrian study on mobility behavior are used to simulate the usage of the EVs. Furthermore, real smart meter data are used to simulate the household base load profiles and a real low voltage grid topology is considered in the load flow simulation. Day-ahead electricity stock market prices are used as the incentive to drive the optimization. The results for the optimum charging strategy is determined and compared to uncontrolled EV charging. The results for the optimum charging strategy show a potential cost saving of about 30.8% compared to uncontrolled EV charging. Although autonomous DSM of EVs achieves a shift of load as pursued, distribution grid operation may be substantially affected by it. We show that in the case of real time price driven operation, voltage drops and elevated peak to average powers result from the coincident charging of vehicles during favourable time slots.
{"title":"Autonomous Demand Side Management of Electric Vehicles in a Distribution Grid","authors":"M. Ireshika, M. Preißinger, P. Kepplinger","doi":"10.1109/IYCE45807.2019.8991564","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991564","url":null,"abstract":"The electricity demand due to the increasing number of EVs presents new challenges for the operation of the electricity network, especially for the distribution grids. The existing grid infrastructure may not be sufficient to meet the new demands imposed by the integration of EVs. Thus, EV charging may possibly lead to reliability and stability issues, especially during the peak demand periods. Demand side management (DSM) is a potential and promising approach for mitigation of the resulting impacts. In this work, we developed an autonomous DSM strategy for optimal charging of EVs to minimize the charging cost and we conducted a simulation study to evaluate the impacts to the grid operation. The proposed approach only requires a one way communicated incentive. Real profiles from an Austrian study on mobility behavior are used to simulate the usage of the EVs. Furthermore, real smart meter data are used to simulate the household base load profiles and a real low voltage grid topology is considered in the load flow simulation. Day-ahead electricity stock market prices are used as the incentive to drive the optimization. The results for the optimum charging strategy is determined and compared to uncontrolled EV charging. The results for the optimum charging strategy show a potential cost saving of about 30.8% compared to uncontrolled EV charging. Although autonomous DSM of EVs achieves a shift of load as pursued, distribution grid operation may be substantially affected by it. We show that in the case of real time price driven operation, voltage drops and elevated peak to average powers result from the coincident charging of vehicles during favourable time slots.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128056870","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991561
D. Motyka, Martina Kajanová, P. Braciník, Marian Tomasov, M. Roch
The utilization of the electricity storage into batteries system is increasing. Most batteries are connected at the point in the network where the power of renewable energy sources is produced. These battery storage systems serve primarily to power electricity to households. They are most often used in cooperation with renewable energy sources, especially photovoltaic power plants. When installing renewable sources without using battery storage in distribution networks, there are several problems in the production of electricity from renewable sources. At a time of low power consumption and high electricity generation at the point of connection of renewable energy sources, a change in power flow occurs. The power generated from the sources flows into the distribution network or up to the superior network. If a distribution company installed battery storage at the point of connection, the power from renewable sources would not flow to the rest of the distribution system and would be stored on that distribution network node. Once the capacity size has been correctly determined at a given node, the distribution company could benefit from such solution. The distribution company could lease the capacity of the batteries to customers who have the renewable energy sources to store their produced energy or could cover part of the electricity consumption at the time of lack of production from the renewable energy sources. The paper deals with this issue, the location of battery storage is simulated on a standardized distribution network.
{"title":"Utilization of the storage systems in a distribution system to balance the consumption","authors":"D. Motyka, Martina Kajanová, P. Braciník, Marian Tomasov, M. Roch","doi":"10.1109/IYCE45807.2019.8991561","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991561","url":null,"abstract":"The utilization of the electricity storage into batteries system is increasing. Most batteries are connected at the point in the network where the power of renewable energy sources is produced. These battery storage systems serve primarily to power electricity to households. They are most often used in cooperation with renewable energy sources, especially photovoltaic power plants. When installing renewable sources without using battery storage in distribution networks, there are several problems in the production of electricity from renewable sources. At a time of low power consumption and high electricity generation at the point of connection of renewable energy sources, a change in power flow occurs. The power generated from the sources flows into the distribution network or up to the superior network. If a distribution company installed battery storage at the point of connection, the power from renewable sources would not flow to the rest of the distribution system and would be stored on that distribution network node. Once the capacity size has been correctly determined at a given node, the distribution company could benefit from such solution. The distribution company could lease the capacity of the batteries to customers who have the renewable energy sources to store their produced energy or could cover part of the electricity consumption at the time of lack of production from the renewable energy sources. The paper deals with this issue, the location of battery storage is simulated on a standardized distribution network.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123272819","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991557
P. Barta, D. Divényi
Supporting renewable energy sources is currently a widely discussed issue. To ensure the pay-off from the application of renewable energy technologies in Hungary, a feed-in-tariff supporting system has been created applying obligatory offtake. It means that the Hungarian TSO has to buy the energy from the producer at a definite price. TSO sells the energy on the day-ahead market and on the intraday market, but this paper focuses only the day-ahead. In general the market clearing price (MCP) is lower than this definite price so the TSO sells the energy at a loss. According to governmental regulations the TSO must be neither profitable nor loss-making so this deficit is allocated to the industrial customers. Limit price is one of the many regulations pertaining to the trading the Hungarian Power Exchange (HUPX DAM) meaning the energy cannot be sold when the MCP is lower than the limit price. If the energy cannot be sold, the TSO will face with high balancing costs. The aim of this paper is to find a way to minimize balancing costs and the amount of balancing energy, either by the modification the limit price or by giving a price-taker offer. Although the KAT system was discontinued on 31 December 2016, the contracted producers still remained within the framework. The authority approved 2000 MW capacity to build in, giving actuality to the topic.
{"title":"Study about the price limit of RES orders","authors":"P. Barta, D. Divényi","doi":"10.1109/IYCE45807.2019.8991557","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991557","url":null,"abstract":"Supporting renewable energy sources is currently a widely discussed issue. To ensure the pay-off from the application of renewable energy technologies in Hungary, a feed-in-tariff supporting system has been created applying obligatory offtake. It means that the Hungarian TSO has to buy the energy from the producer at a definite price. TSO sells the energy on the day-ahead market and on the intraday market, but this paper focuses only the day-ahead. In general the market clearing price (MCP) is lower than this definite price so the TSO sells the energy at a loss. According to governmental regulations the TSO must be neither profitable nor loss-making so this deficit is allocated to the industrial customers. Limit price is one of the many regulations pertaining to the trading the Hungarian Power Exchange (HUPX DAM) meaning the energy cannot be sold when the MCP is lower than the limit price. If the energy cannot be sold, the TSO will face with high balancing costs. The aim of this paper is to find a way to minimize balancing costs and the amount of balancing energy, either by the modification the limit price or by giving a price-taker offer. Although the KAT system was discontinued on 31 December 2016, the contracted producers still remained within the framework. The authority approved 2000 MW capacity to build in, giving actuality to the topic.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121780033","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991579
I. Vokony, B. Hartmann, C. Farkas, J. Kiss, P. Sőrés
The increasingly spreading household-scale renewable energy generation can create voltage problems, overloads, and other system operational issues mainly on the low voltage network. These problems cannot be handled economically effective with traditional network operation and maintenance solutions. Aim of this paper is to give an expert analysis in consideration of possible new technologies from system operator point of view bearing in mind the regulatory environment. Analytical methods and simulation were used to evaluate the effects of these technologies and trends. 14 network effects and 9 different technologies were examined. As a result a revised microgrid definition will be introduced and 5 proposed interventions are formulated.
{"title":"Future level of distribution system operator's involvement in spread of microgrid technologies: a review","authors":"I. Vokony, B. Hartmann, C. Farkas, J. Kiss, P. Sőrés","doi":"10.1109/IYCE45807.2019.8991579","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991579","url":null,"abstract":"The increasingly spreading household-scale renewable energy generation can create voltage problems, overloads, and other system operational issues mainly on the low voltage network. These problems cannot be handled economically effective with traditional network operation and maintenance solutions. Aim of this paper is to give an expert analysis in consideration of possible new technologies from system operator point of view bearing in mind the regulatory environment. Analytical methods and simulation were used to evaluate the effects of these technologies and trends. 14 network effects and 9 different technologies were examined. As a result a revised microgrid definition will be introduced and 5 proposed interventions are formulated.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121811140","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991578
László Oltványi, Z. Tóth
Nowadays, the search for optimal realization of how to get disconnected from the power grid has become a trend. There has been a great variety of solutions revealed which operate as completely [1], [2] or partly [3] “off-grid” systems. In the future, the assurance of proper energy management, power quality and dependability will be a key question in the operation of these networks. When considering different environment-friendly energy sources for this purpose, we cannot leave out the implementation of an energy storing utility in order to straighten out the differences in the daily energy production and demand [4]. The decrease in prices of energy storing technologies happened over the course of the last decades also matches the evolvement of introducing the upper-mentioned utility. In my paper I will use up- to-date energy data basing my calculations to reveal an energy storing solution capable to balance the energy use of an average household which also serves as energy producer [5]. Apart from the minimization of the downside effects of feeding back into the grid, it is also aimed to provide service continuity and the elimination of voltage fluctuation as the results of electing the adequate energy storage utility and elaborating a supporting building management system [6].
{"title":"Problems Evoked by The Integration of Renewables as Parts of Building Energy Management Systems","authors":"László Oltványi, Z. Tóth","doi":"10.1109/IYCE45807.2019.8991578","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991578","url":null,"abstract":"Nowadays, the search for optimal realization of how to get disconnected from the power grid has become a trend. There has been a great variety of solutions revealed which operate as completely [1], [2] or partly [3] “off-grid” systems. In the future, the assurance of proper energy management, power quality and dependability will be a key question in the operation of these networks. When considering different environment-friendly energy sources for this purpose, we cannot leave out the implementation of an energy storing utility in order to straighten out the differences in the daily energy production and demand [4]. The decrease in prices of energy storing technologies happened over the course of the last decades also matches the evolvement of introducing the upper-mentioned utility. In my paper I will use up- to-date energy data basing my calculations to reveal an energy storing solution capable to balance the energy use of an average household which also serves as energy producer [5]. Apart from the minimization of the downside effects of feeding back into the grid, it is also aimed to provide service continuity and the elimination of voltage fluctuation as the results of electing the adequate energy storage utility and elaborating a supporting building management system [6].","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125359278","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991582
Sevgi Erzen, E. Açıkkalp, A. Hepbasli
Exergy analysis is a very strong method to evaluate the performance of energy-related systems from the thermodynamic point of view. Because, unlike the energy analysis, exergy analysis enables to determine the location and amount of the irreversibilities, which cause inefficiencies in the system and its components. In this study, the results of exergetic performances of two various heating systems, namely a steam- heated system and a closed-cycle heat pump system, for lumber- drying are considered and compared for the first time to the best of the authors' knowledge. The thermodynamic inefficiencies of the system components are evaluated in parts. The results show that the condenser in the closed-cycle heat pump is the most important system component for efficiency improvement. By comparison, various investigators reported in their similar studies that exergy efficiency values varied between 76-97%.
{"title":"Exergetic Performance Comparison between Steam-Heated and Closed-Cycle Heat Pump Applications for Lumber-Drying","authors":"Sevgi Erzen, E. Açıkkalp, A. Hepbasli","doi":"10.1109/IYCE45807.2019.8991582","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991582","url":null,"abstract":"Exergy analysis is a very strong method to evaluate the performance of energy-related systems from the thermodynamic point of view. Because, unlike the energy analysis, exergy analysis enables to determine the location and amount of the irreversibilities, which cause inefficiencies in the system and its components. In this study, the results of exergetic performances of two various heating systems, namely a steam- heated system and a closed-cycle heat pump system, for lumber- drying are considered and compared for the first time to the best of the authors' knowledge. The thermodynamic inefficiencies of the system components are evaluated in parts. The results show that the condenser in the closed-cycle heat pump is the most important system component for efficiency improvement. By comparison, various investigators reported in their similar studies that exergy efficiency values varied between 76-97%.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125912711","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991558
A. Mihok, A. R. Imre
Although geothermal energy is commonly used as resource of district heating, the aim of my research is to explore the possibilities of its utilization to produce electricity. In this study, I reviewed the geothermal studies of last years, and I appointed a suitable place where a power plant could be built. Besides, another goal of my research is to choose the most appropriate technology fitting the given heat source conditions. The possibility to use organic Rankine cycle has been examined and the general operation conditions have been determined by using Cycle-Tempo program. Based on preliminary results, six working fluids were selected to test the model. These cases were analyzed based on the considerations of output power and efficiency as well as technical feasibility. Beyond these points of views, the applied systems and working fluids were examined by economic, environmental and safety aspects.
{"title":"Low-Temperature Organic Rankine Cycles Using Natural Working Fluids","authors":"A. Mihok, A. R. Imre","doi":"10.1109/IYCE45807.2019.8991558","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991558","url":null,"abstract":"Although geothermal energy is commonly used as resource of district heating, the aim of my research is to explore the possibilities of its utilization to produce electricity. In this study, I reviewed the geothermal studies of last years, and I appointed a suitable place where a power plant could be built. Besides, another goal of my research is to choose the most appropriate technology fitting the given heat source conditions. The possibility to use organic Rankine cycle has been examined and the general operation conditions have been determined by using Cycle-Tempo program. Based on preliminary results, six working fluids were selected to test the model. These cases were analyzed based on the considerations of output power and efficiency as well as technical feasibility. Beyond these points of views, the applied systems and working fluids were examined by economic, environmental and safety aspects.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126429974","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991570
L. Rácz, G. Gabor, B. Németh
Nowadays in the electricity system several challenges have been appeared that system operators have to cope with. One of the major challenges is to increase the transmission capacity of the overhead lines (OHL), while maintaining the safety and security level of the network. Dynamic Line Rating (DLR) by monitoring the real-time environmental parameters next to the conductor is a promising and cost-effective way to use the existing infrastructure with higher efficiency. There are several different deterministic DLR models in the international literature, but there are also other approaches based on soft computing or Monte Carlo simulations for the calculation of transmission capacity. The aim of this paper is to demonstrate the operation of the different models by presenting a real case study.
{"title":"Different Approaches of Dynamic Line Rating Calculations","authors":"L. Rácz, G. Gabor, B. Németh","doi":"10.1109/IYCE45807.2019.8991570","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991570","url":null,"abstract":"Nowadays in the electricity system several challenges have been appeared that system operators have to cope with. One of the major challenges is to increase the transmission capacity of the overhead lines (OHL), while maintaining the safety and security level of the network. Dynamic Line Rating (DLR) by monitoring the real-time environmental parameters next to the conductor is a promising and cost-effective way to use the existing infrastructure with higher efficiency. There are several different deterministic DLR models in the international literature, but there are also other approaches based on soft computing or Monte Carlo simulations for the calculation of transmission capacity. The aim of this paper is to demonstrate the operation of the different models by presenting a real case study.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132762160","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}
Pub Date : 2019-07-01DOI: 10.1109/IYCE45807.2019.8991563
Dániel Füzesi, V. Józsa
Modern combustion technology focuses on lean premixed burners to achieve high thermal efficiency, wide operating range, and low pollutant emissions for steady-state operation. The corresponding applications range from boilers to gas turbines. The present paper is a preliminary analysis of a turbulent laboratory test burner with 30 kW combustion power by using CFD. The reference fuel was natural gas and four biogases were tested which were modeled as a mixture of CH4, CO2, and H2 in various compositions. Even though the combustion is steady, the steady solution was inappropriate due to the notable presence of unsteady flow structures. Since the combustion in the present case is dominated by volumetric reactions, a coarse boundary layer could be applied near the wall. However, the shear-dominated flow required the use of at least k-ω SST turbulent viscosity model. The transient cases were calculated by using Scale Adaptive Simulation. Among the fuels, natural gas combustion showed flashback due to the bluff body present at the center in the mixing tube inlet. Nevertheless, its extent was low and some central purge air in the real burner will solve this problem. All the flame shapes were V and W, meaning an optimal condition for combustion chamber loading. Even though the overall mass flow rates at the inlet are increasing with the decreasing heating value of the fuel, natural gas combustion showed the highest velocity and temperature in the flow field. Overall, a small hydrogen dilution of the CH4-CO2 containing fuel acted as an excellent combustion stabilizer without flashback or too intense heat release rate. As a consequence, the presently analyzed burner can run on low calorific value fuels without design modifications or exposing locally high thermal load on the combustion chamber. Since it is an initial study, validation and the evaluation of practical relevance will be discussed in subsequent works.
{"title":"Numerical analysis of biogas combustion in a lean premixed swirl burner","authors":"Dániel Füzesi, V. Józsa","doi":"10.1109/IYCE45807.2019.8991563","DOIUrl":"https://doi.org/10.1109/IYCE45807.2019.8991563","url":null,"abstract":"Modern combustion technology focuses on lean premixed burners to achieve high thermal efficiency, wide operating range, and low pollutant emissions for steady-state operation. The corresponding applications range from boilers to gas turbines. The present paper is a preliminary analysis of a turbulent laboratory test burner with 30 kW combustion power by using CFD. The reference fuel was natural gas and four biogases were tested which were modeled as a mixture of CH4, CO2, and H2 in various compositions. Even though the combustion is steady, the steady solution was inappropriate due to the notable presence of unsteady flow structures. Since the combustion in the present case is dominated by volumetric reactions, a coarse boundary layer could be applied near the wall. However, the shear-dominated flow required the use of at least k-ω SST turbulent viscosity model. The transient cases were calculated by using Scale Adaptive Simulation. Among the fuels, natural gas combustion showed flashback due to the bluff body present at the center in the mixing tube inlet. Nevertheless, its extent was low and some central purge air in the real burner will solve this problem. All the flame shapes were V and W, meaning an optimal condition for combustion chamber loading. Even though the overall mass flow rates at the inlet are increasing with the decreasing heating value of the fuel, natural gas combustion showed the highest velocity and temperature in the flow field. Overall, a small hydrogen dilution of the CH4-CO2 containing fuel acted as an excellent combustion stabilizer without flashback or too intense heat release rate. As a consequence, the presently analyzed burner can run on low calorific value fuels without design modifications or exposing locally high thermal load on the combustion chamber. Since it is an initial study, validation and the evaluation of practical relevance will be discussed in subsequent works.","PeriodicalId":226881,"journal":{"name":"2019 7th International Youth Conference on Energy (IYCE)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133674674","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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