Polygeneration improves energy efficiency and reduces both energy consumption and pollutant emissions compared to conventional generation technologies. A polygeneration system is a variation of a cogeneration system, in which more than two outputs, i.e., heat, power, cooling, water, energy or fuels, are accounted for. In particular, polygeneration systems integrating solar energy and water desalination represent promising technologies for energy production and water supply. They are therefore interesting options for coastal regions with a high solar potential, such as those located in southern Peru and northern Chile. Notice that most of the Peruvian and Chilean mining industry operations intensive in electricity and water consumption are located in these particular regions. Accordingly, this work focus on the design and integration of a polygeneration system producing industrial heating, cooling, electrical power and water for an industrial plant. In particular, the design procedure followed in this work involves integer linear programming modeling (MILP). The technical and economic feasibility of integrating renewable energy technologies, thermal energy storage, power and thermal exchange, absorption chillers, cogeneration heat engines and desalination technologies is particularly assessed. The polygeneration system integration carried out seeks to minimize the system total annual cost subject to CO2 emissions restrictions. Particular economic aspects accounted for include investment, maintenance and operating costs.
{"title":"Design and Integration of a Renewable Energy Based Polygeneration System With Desalination for an Industrial Plant","authors":"Lucero Cynthia Luciano De La Cruz, Cesar Celis","doi":"10.1115/power2019-1932","DOIUrl":"https://doi.org/10.1115/power2019-1932","url":null,"abstract":"\u0000 Polygeneration improves energy efficiency and reduces both energy consumption and pollutant emissions compared to conventional generation technologies. A polygeneration system is a variation of a cogeneration system, in which more than two outputs, i.e., heat, power, cooling, water, energy or fuels, are accounted for. In particular, polygeneration systems integrating solar energy and water desalination represent promising technologies for energy production and water supply. They are therefore interesting options for coastal regions with a high solar potential, such as those located in southern Peru and northern Chile. Notice that most of the Peruvian and Chilean mining industry operations intensive in electricity and water consumption are located in these particular regions. Accordingly, this work focus on the design and integration of a polygeneration system producing industrial heating, cooling, electrical power and water for an industrial plant. In particular, the design procedure followed in this work involves integer linear programming modeling (MILP). The technical and economic feasibility of integrating renewable energy technologies, thermal energy storage, power and thermal exchange, absorption chillers, cogeneration heat engines and desalination technologies is particularly assessed. The polygeneration system integration carried out seeks to minimize the system total annual cost subject to CO2 emissions restrictions. Particular economic aspects accounted for include investment, maintenance and operating costs.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127078463","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}
B. Haller, A. D’Ovidio, J. Henson, A. Beevers, Abhimanyu Gupta
The purpose of this paper is to present advances in Reaction Technology Blading design for large steam turbines at Low Aspect Ratio, based on ‘Controlled Flow 2-type’ technology. Reaction technology blading has not previously been evaluated like the impulse blading for improvements from advanced aerodynamic technologies. This paper identifies several unique design improvements and validated by advanced analytical modelling and model turbine testing.
{"title":"Development of Improved Reaction Technology Blading (RTB LAR) for Large Steam Turbines","authors":"B. Haller, A. D’Ovidio, J. Henson, A. Beevers, Abhimanyu Gupta","doi":"10.1115/power2019-1804","DOIUrl":"https://doi.org/10.1115/power2019-1804","url":null,"abstract":"\u0000 The purpose of this paper is to present advances in Reaction Technology Blading design for large steam turbines at Low Aspect Ratio, based on ‘Controlled Flow 2-type’ technology. Reaction technology blading has not previously been evaluated like the impulse blading for improvements from advanced aerodynamic technologies. This paper identifies several unique design improvements and validated by advanced analytical modelling and model turbine testing.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125833952","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}
This paper addresses the potential of integrating the existing oil wells and absorption chiller for the purpose of provision space cooling for the base camp of oil field at Block 9 located in Oman. The wellbore was used as a hot water feed to the chiller. Well S 347 was selected as the hot water source and well S 179 was selected to be the injection well for the outlet water. The existing wells were assessed via PIPESIM software. Using PIPESIM software, the fluid temperatures, well pressure and flow rates were obtained and analyzed throughout NODAL analyses. The water temperature of 100 °C, well head pressure of 100 psi and flow rate of 30 m3/h, were found to be the optimum operating parameters. The COP of the absorption chiller was obtained via ABSIM software. The variable operating conditions were investigated and elaborated as a function of the efficiency and capacity ratio. The designed system was configured to yield 0.733 COP and a capacity of 377 KW which met the cooling capacity of the admin building of block 9. The entire feasibility analysis was performed in terms of the overall cost as well as the saving that would be achieved from such homogeneity. The payback period of the entire system was found to be 7 years which emphasized a great potential of adapting the technology if the operating resources are available.
{"title":"Applications of Geothermal Energy in Space Cooling: A Simulator Study of Existing Oil Well to Activate an Absorption Chiller","authors":"F. Ghaith, Kamal Majlab Wars","doi":"10.1115/power2019-1828","DOIUrl":"https://doi.org/10.1115/power2019-1828","url":null,"abstract":"\u0000 This paper addresses the potential of integrating the existing oil wells and absorption chiller for the purpose of provision space cooling for the base camp of oil field at Block 9 located in Oman. The wellbore was used as a hot water feed to the chiller. Well S 347 was selected as the hot water source and well S 179 was selected to be the injection well for the outlet water.\u0000 The existing wells were assessed via PIPESIM software. Using PIPESIM software, the fluid temperatures, well pressure and flow rates were obtained and analyzed throughout NODAL analyses. The water temperature of 100 °C, well head pressure of 100 psi and flow rate of 30 m3/h, were found to be the optimum operating parameters. The COP of the absorption chiller was obtained via ABSIM software. The variable operating conditions were investigated and elaborated as a function of the efficiency and capacity ratio. The designed system was configured to yield 0.733 COP and a capacity of 377 KW which met the cooling capacity of the admin building of block 9. The entire feasibility analysis was performed in terms of the overall cost as well as the saving that would be achieved from such homogeneity. The payback period of the entire system was found to be 7 years which emphasized a great potential of adapting the technology if the operating resources are available.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"457 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116025204","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}
Flame-assisted fuel cell (FFC) systems have been investigated and developed for small scale power generation applications. The introduction of micro-combustion into the FFC setup has potential to increase the electrical efficiency of the system and reduce the size. However, micro-combustion at high equivalence ratios in FFC systems still needs more investigation. In this paper, a FFC system with micro-combustion at high equivalence ratios is discussed. The thermal and mass balance in this system are analyzed to evaluate the theoretical possibility of self-sustained micro-combustion at high equivalence ratios in FFC systems. The effect of heat recirculation on the system performance is investigated. Due to operation at high equivalence ratios, the electrical efficiency of the system is competitive with other micro-scale power generation systems and also shows great potential for high performance micro combined heat and power (CHP) systems.
{"title":"A Flame-Assisted Fuel Cell (FFC) System With Self-Sustained Micro-Combustion at High Equivalence Ratios","authors":"Jiashen Tian, R. Milcarek","doi":"10.1115/power2019-1862","DOIUrl":"https://doi.org/10.1115/power2019-1862","url":null,"abstract":"\u0000 Flame-assisted fuel cell (FFC) systems have been investigated and developed for small scale power generation applications. The introduction of micro-combustion into the FFC setup has potential to increase the electrical efficiency of the system and reduce the size. However, micro-combustion at high equivalence ratios in FFC systems still needs more investigation. In this paper, a FFC system with micro-combustion at high equivalence ratios is discussed. The thermal and mass balance in this system are analyzed to evaluate the theoretical possibility of self-sustained micro-combustion at high equivalence ratios in FFC systems. The effect of heat recirculation on the system performance is investigated. Due to operation at high equivalence ratios, the electrical efficiency of the system is competitive with other micro-scale power generation systems and also shows great potential for high performance micro combined heat and power (CHP) systems.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116102815","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}
Intermittent nature of power from renewable energy resources demands a large scale energy storage system for their optimal utilization. Compressed air energy storage systems have the potential to serve as long-term large-scale energy storage systems. Efficient compressors are needed to realize a high storage efficiency with compressed air energy storage systems. Liquid piston compressor is highly effective in achieving efficient near-isothermal compression. Compression efficiency of the liquid piston can be improved with the use of heat transfer enhancement mechanisms inside the compression chamber. A high rate of heat transfer can be achieved with the use of metal wire mesh in the liquid piston compressor. In this study, metal wire meshes of aluminum and copper materials in the form of Archimedean spiral are experimentally tested in a liquid (water) piston compressor. Experiments are conducted for the compression of air from atmospheric pressure to 280–300 kPa pressure at various stroke times of compression. The peak air temperature is reduced by 26–33K with the use of metal wire mesh inside the liquid piston compressor. Both the materials are observed to be equally effective for temperature abatement. The use of metal wire mesh in liquid piston shifts the compression process towards near-isothermal conditions. Furthermore, the isothermal efficiency of compression is evaluated to assess the potential of efficiency improvement with this technique. The metal wire mesh was observed to improve isothermal compression efficiency to 88–90% from the base efficiency of 82–84%. A 6–7% improvement in efficiency was observed at faster compression strokes signifying effectiveness of metal wire mesh to accomplish efficient compression with high power density. Further investigations to evaluate the optimal configuration of the metal wire mesh will be useful to achieve additional improvement in efficiency.
{"title":"Efficiency Improvement of a Liquid Piston Compressor Using Metal Wire Mesh","authors":"V. Patil, Jun Liu, P. I. Ro","doi":"10.1115/power2019-1945","DOIUrl":"https://doi.org/10.1115/power2019-1945","url":null,"abstract":"\u0000 Intermittent nature of power from renewable energy resources demands a large scale energy storage system for their optimal utilization. Compressed air energy storage systems have the potential to serve as long-term large-scale energy storage systems. Efficient compressors are needed to realize a high storage efficiency with compressed air energy storage systems. Liquid piston compressor is highly effective in achieving efficient near-isothermal compression. Compression efficiency of the liquid piston can be improved with the use of heat transfer enhancement mechanisms inside the compression chamber. A high rate of heat transfer can be achieved with the use of metal wire mesh in the liquid piston compressor. In this study, metal wire meshes of aluminum and copper materials in the form of Archimedean spiral are experimentally tested in a liquid (water) piston compressor. Experiments are conducted for the compression of air from atmospheric pressure to 280–300 kPa pressure at various stroke times of compression. The peak air temperature is reduced by 26–33K with the use of metal wire mesh inside the liquid piston compressor. Both the materials are observed to be equally effective for temperature abatement. The use of metal wire mesh in liquid piston shifts the compression process towards near-isothermal conditions. Furthermore, the isothermal efficiency of compression is evaluated to assess the potential of efficiency improvement with this technique. The metal wire mesh was observed to improve isothermal compression efficiency to 88–90% from the base efficiency of 82–84%. A 6–7% improvement in efficiency was observed at faster compression strokes signifying effectiveness of metal wire mesh to accomplish efficient compression with high power density. Further investigations to evaluate the optimal configuration of the metal wire mesh will be useful to achieve additional improvement in efficiency.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122923630","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 University of California, Irvine (UCI) uses a 19 MW natural gas combined cycle (NGCC) to provide nearly all campus energy requirements. Meanwhile, the University of California system has committed to achieving carbon neutrality at all facilities by 2025. This has resulted in an influx of new energy efficiency and onsite solar generation, increasing the duration of NGCC part load operation. In addition, the shift towards carbon neutrality has resulted in the pursuit of renewable natural gas via anaerobic digestion to replace conventional fossil fuels. The combination of other sources of renewable generation and the shift towards more expensive fuels has created the need to boost NGCC part load performance. This work focuses on the methods used at UCI to explore the NGCC operating space in order to optimize part-load performance. In this work, a physical gas turbine and heat recovery steam generator model are developed and used with an exhaustive search optimization method to predict maximum part load plant efficiency. NGCC control elements considered in this work include gas turbine inlet guide vane modulation and changing combustor outlet temperature. This optimization was also used to explore replacing the current engine with a two-shaft or smaller gas turbine. Results indicate that there are some possible benefits with increased modulation of inlet guide vanes, but the largest efficiency gains are achieved when allowing the compressor to operate at variable speed. Shifting towards a smaller engine could also enable more consistent full power operation, but must be paired with additional resources in order to meet the campus demand.
{"title":"Optimizing Natural Gas Combined Cycle Part Load Operation","authors":"Robert Flores, J. Brouwer","doi":"10.1115/power2019-1942","DOIUrl":"https://doi.org/10.1115/power2019-1942","url":null,"abstract":"\u0000 The University of California, Irvine (UCI) uses a 19 MW natural gas combined cycle (NGCC) to provide nearly all campus energy requirements. Meanwhile, the University of California system has committed to achieving carbon neutrality at all facilities by 2025. This has resulted in an influx of new energy efficiency and onsite solar generation, increasing the duration of NGCC part load operation. In addition, the shift towards carbon neutrality has resulted in the pursuit of renewable natural gas via anaerobic digestion to replace conventional fossil fuels. The combination of other sources of renewable generation and the shift towards more expensive fuels has created the need to boost NGCC part load performance. This work focuses on the methods used at UCI to explore the NGCC operating space in order to optimize part-load performance. In this work, a physical gas turbine and heat recovery steam generator model are developed and used with an exhaustive search optimization method to predict maximum part load plant efficiency. NGCC control elements considered in this work include gas turbine inlet guide vane modulation and changing combustor outlet temperature. This optimization was also used to explore replacing the current engine with a two-shaft or smaller gas turbine. Results indicate that there are some possible benefits with increased modulation of inlet guide vanes, but the largest efficiency gains are achieved when allowing the compressor to operate at variable speed. Shifting towards a smaller engine could also enable more consistent full power operation, but must be paired with additional resources in order to meet the campus demand.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128728744","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}
Solar water heaters (SWHs) are a well-established renewable energy technology that have been widely adopted around the world. The downfall of this technology is rooted in the inconsistency of solar intensity from day to night. In the recent studies, the application of energy storage materials such as phase change materials (PCMs) has attracted many attentions; however, PCM by itself may not be effective due to the poor heat transfer rate, low thermal diffusivity and thermal conductivity. This paper aims to explore the thermal performance of energy storage-transfer materials to be applied in conjunction with PCMs. The selected types of PCMs are paraffin waxes with melting point temperatures of 28–72°C. In the first analysis, silicone oil is selected as the heat transfer medium with high thermal stability. The melting point and specific heat capacity were measured by a modulated differential scanning calorimeter (MDSC). The obtained results show that silicone oil will lead to melting point depression of maximum 3°C in the PCMs. In the second analysis, the heat transfer enhancement by addition of nanoparticles has been investigated. The selected nanoparticles for this analysis are Aluminum Oxide (Al2O3) and Cupric Oxide (CuO). The obtained results from this study show thermal performance improvement of the PCMs which can be applied to different thermal energy storage systems, such as in the case of solar thermal collectors for the application in SWH technology.
{"title":"Heat Transfer Enhancement of Phase Change Materials for Thermal Energy Storage Systems","authors":"C. Lim, R. Weaver, Sarvenaz Sobhansarbandi","doi":"10.1115/power2019-1880","DOIUrl":"https://doi.org/10.1115/power2019-1880","url":null,"abstract":"\u0000 Solar water heaters (SWHs) are a well-established renewable energy technology that have been widely adopted around the world. The downfall of this technology is rooted in the inconsistency of solar intensity from day to night. In the recent studies, the application of energy storage materials such as phase change materials (PCMs) has attracted many attentions; however, PCM by itself may not be effective due to the poor heat transfer rate, low thermal diffusivity and thermal conductivity. This paper aims to explore the thermal performance of energy storage-transfer materials to be applied in conjunction with PCMs. The selected types of PCMs are paraffin waxes with melting point temperatures of 28–72°C. In the first analysis, silicone oil is selected as the heat transfer medium with high thermal stability. The melting point and specific heat capacity were measured by a modulated differential scanning calorimeter (MDSC). The obtained results show that silicone oil will lead to melting point depression of maximum 3°C in the PCMs. In the second analysis, the heat transfer enhancement by addition of nanoparticles has been investigated. The selected nanoparticles for this analysis are Aluminum Oxide (Al2O3) and Cupric Oxide (CuO). The obtained results from this study show thermal performance improvement of the PCMs which can be applied to different thermal energy storage systems, such as in the case of solar thermal collectors for the application in SWH technology.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123982666","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}
Understanding the thermodynamics associated with ion mixing and separation processes is important in order to meet the rising demands for clean energy and water production. Several electrochemical-based technologies such as capacitive deionization and capacitive mixing (CapMix) are capable of achieving desalination and energy production through ion mixing and separation processes, yet experimental investigations suggest energy conversion occurs with low second law (thermodynamic) efficiency. Here, we explore the maximum attainable efficiency for different CapMix cycles to investigate the impact cycle operation has on energy extraction. All investigated cycles are analogous to well documented heat engine cycles. In order to analyze CapMix cycles, we develop a physics-based model of the electric double layer based on the Gouy-Chapman-Stern theory. Evaluating CapMix cycles for energy generation revealed that cycles where ion mixing occurs at constant concentration and switching occurs at constant charge (a cycle analogous to the Stirling engine) attained the highest overall first law (electrical energy) efficiency (39%). This first law efficiency is nearly 300% greater than the first law efficiency of the Otto, Diesel, Brayton, and Atkinson analog cycles where ion mixing occurs while maintaining a constant number of ions. Additionally, the maximum first law efficiency was 89% with a maximum work output of 0.5 kWh per m3 of solution mixed (V = 1.0V) using this same Stirling cycle. Here the salinity gradient was CH = 600 mM and CL = 1 mM (ΔGmix = 0.56 kWh/m3). The effect of voltage was also examined at CH = 600 mM (seawater) and CL = 20 mM (river water). CapMix cycles operated at lower voltage (V < 1.0V), resulted in the Otto cycle yielding the highest first law efficiency of approximately 25% (compared to under 20% for the Stirling cycle); however, this was at the expense of a reduction (50x) in net electrical energy extracted from the same mixing process (0.01 kWh per m3).
{"title":"Using Thermodynamics Principles to Optimize Performance of Capacitive Mixing Cycles for Salinity Gradient Energy Generation","authors":"Daniel Moreno, M. Hatzell","doi":"10.1115/power2019-1902","DOIUrl":"https://doi.org/10.1115/power2019-1902","url":null,"abstract":"\u0000 Understanding the thermodynamics associated with ion mixing and separation processes is important in order to meet the rising demands for clean energy and water production. Several electrochemical-based technologies such as capacitive deionization and capacitive mixing (CapMix) are capable of achieving desalination and energy production through ion mixing and separation processes, yet experimental investigations suggest energy conversion occurs with low second law (thermodynamic) efficiency. Here, we explore the maximum attainable efficiency for different CapMix cycles to investigate the impact cycle operation has on energy extraction. All investigated cycles are analogous to well documented heat engine cycles. In order to analyze CapMix cycles, we develop a physics-based model of the electric double layer based on the Gouy-Chapman-Stern theory. Evaluating CapMix cycles for energy generation revealed that cycles where ion mixing occurs at constant concentration and switching occurs at constant charge (a cycle analogous to the Stirling engine) attained the highest overall first law (electrical energy) efficiency (39%). This first law efficiency is nearly 300% greater than the first law efficiency of the Otto, Diesel, Brayton, and Atkinson analog cycles where ion mixing occurs while maintaining a constant number of ions. Additionally, the maximum first law efficiency was 89% with a maximum work output of 0.5 kWh per m3 of solution mixed (V = 1.0V) using this same Stirling cycle. Here the salinity gradient was CH = 600 mM and CL = 1 mM (ΔGmix = 0.56 kWh/m3). The effect of voltage was also examined at CH = 600 mM (seawater) and CL = 20 mM (river water). CapMix cycles operated at lower voltage (V < 1.0V), resulted in the Otto cycle yielding the highest first law efficiency of approximately 25% (compared to under 20% for the Stirling cycle); however, this was at the expense of a reduction (50x) in net electrical energy extracted from the same mixing process (0.01 kWh per m3).","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121767189","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}
Heng Chen, Zhen Qi, Dai Lihao, Qiao Chen, Gang Xu, Peiyuan Pan
A novel hybrid system for combustion air heating, including flue gas cooling, air heating and heat regeneration has been proposed. In the reformative scheme, the air gains energy from four tubular heat exchangers and the flue gas releases heat in four tubular heat exchangers as well, instead of the rotary regenerative air preheater (APH) that is used in the conventional scheme. Consequently, the temperature differences between the fluids during heat transmission can be diminished, and the mixing of the hot-cold primary air and the severe leakages are avoided, which remarkably reduces the exergy destruction and enhances the thermal performance of the power unit. The new design was evaluated based on a 670 MW coal-fired supercritical power unit. The results show that the additional net power output of the power unit can reach 8.57 MW with a net efficiency promotion of 0.57 percentage points due to the novel configuration. And the energy saving mechanism of the proposed concept was revealed on grounds of the first and second laws of thermodynamics.
{"title":"A Novel Combustion Air Preheating System in a Large-Scale Coal-Fired Power Unit","authors":"Heng Chen, Zhen Qi, Dai Lihao, Qiao Chen, Gang Xu, Peiyuan Pan","doi":"10.1115/power2019-1909","DOIUrl":"https://doi.org/10.1115/power2019-1909","url":null,"abstract":"\u0000 A novel hybrid system for combustion air heating, including flue gas cooling, air heating and heat regeneration has been proposed. In the reformative scheme, the air gains energy from four tubular heat exchangers and the flue gas releases heat in four tubular heat exchangers as well, instead of the rotary regenerative air preheater (APH) that is used in the conventional scheme. Consequently, the temperature differences between the fluids during heat transmission can be diminished, and the mixing of the hot-cold primary air and the severe leakages are avoided, which remarkably reduces the exergy destruction and enhances the thermal performance of the power unit. The new design was evaluated based on a 670 MW coal-fired supercritical power unit. The results show that the additional net power output of the power unit can reach 8.57 MW with a net efficiency promotion of 0.57 percentage points due to the novel configuration. And the energy saving mechanism of the proposed concept was revealed on grounds of the first and second laws of thermodynamics.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132460544","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}
Di Hu, Sheng Guo, Gang Chen, Cheng Zhang, Dongzhen Lv, Bing Li, Chen Qianming
In this work, a new idea was proposed that establishes normal behavior model (NBM) with multiple inputs and multiple outputs for each specific equipment based on Principle components analysis — Nonlinear autoregressive exogenous model (PCA-NARX) a kind of ANN. The operating parameters interested in condition monitoring are selected from SIS as an aggregation for a certain equipment, and the corresponding NBM is constructed based on the co-relation among parameters and the autocorrelation in each parameter. Each operating parameter can determine a reasonable range in real time by NBM, so it can detect abnormal operation parameters more quickly than the traditional fixed threshold method. Combining the historical operational data of the No. 1 induced draft fan of No. 3 generating unit in Shajiao C Power Plant in China, and the aggregation for induced draft fan covers 12 operating parameters interested in condition monitoring. This work used MATLAB to verify and analyze the proposed method. It is found that the NBM for induced draft fan early anomaly identification established in this work can achieve rapid response to the fault and give an alarm in the early stage of the fault. Moreover, the method can be easily applied to other mechanical equipment in thermal power plant and has good engineering application value.
{"title":"Induced Draft Fan Early Anomaly Identification Based on SIS Data Using Normal Behavior Model in Thermal Power Plant","authors":"Di Hu, Sheng Guo, Gang Chen, Cheng Zhang, Dongzhen Lv, Bing Li, Chen Qianming","doi":"10.1115/power2019-1864","DOIUrl":"https://doi.org/10.1115/power2019-1864","url":null,"abstract":"\u0000 In this work, a new idea was proposed that establishes normal behavior model (NBM) with multiple inputs and multiple outputs for each specific equipment based on Principle components analysis — Nonlinear autoregressive exogenous model (PCA-NARX) a kind of ANN. The operating parameters interested in condition monitoring are selected from SIS as an aggregation for a certain equipment, and the corresponding NBM is constructed based on the co-relation among parameters and the autocorrelation in each parameter. Each operating parameter can determine a reasonable range in real time by NBM, so it can detect abnormal operation parameters more quickly than the traditional fixed threshold method. Combining the historical operational data of the No. 1 induced draft fan of No. 3 generating unit in Shajiao C Power Plant in China, and the aggregation for induced draft fan covers 12 operating parameters interested in condition monitoring. This work used MATLAB to verify and analyze the proposed method. It is found that the NBM for induced draft fan early anomaly identification established in this work can achieve rapid response to the fault and give an alarm in the early stage of the fault. Moreover, the method can be easily applied to other mechanical equipment in thermal power plant and has good engineering application value.","PeriodicalId":315864,"journal":{"name":"ASME 2019 Power Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133030052","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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