Pub Date : 2023-09-30DOI: 10.15231/jksc.2023.28.3.036
Yuangang Wang, Soon-Been Park, Chae-Hoon Sohn
Pressure effects on NOx emission in a gas turbine combustor are numerically investigated in the present study. Initially, fully premixed flame condition with air and fuel injection at the combustor inlet is examined. Increasing pressure leads to a 0.08% rise in flame temperature and a significant 30% increase in NOx emissions. Technically premixed flame condition is then conducted. NOx emissions rise from 1.3 to 3 bar but decline beyond 3 bar due to combined pressure and mixing effects. Applying the NOx emission calibration formula, which accounts for pressure-induced changes while eliminating mixing influence, reveals a direct link between increased pressure and higher NOx emissions.
{"title":"Analysis of the Effects of Pressure and Unmixedness on NOx Emissions in a Model Gas Turbine Combustor","authors":"Yuangang Wang, Soon-Been Park, Chae-Hoon Sohn","doi":"10.15231/jksc.2023.28.3.036","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.3.036","url":null,"abstract":"Pressure effects on NOx emission in a gas turbine combustor are numerically investigated in the present study. Initially, fully premixed flame condition with air and fuel injection at the combustor inlet is examined. Increasing pressure leads to a 0.08% rise in flame temperature and a significant 30% increase in NOx emissions. Technically premixed flame condition is then conducted. NOx emissions rise from 1.3 to 3 bar but decline beyond 3 bar due to combined pressure and mixing effects. Applying the NOx emission calibration formula, which accounts for pressure-induced changes while eliminating mixing influence, reveals a direct link between increased pressure and higher NOx emissions.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127307","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 : 2023-09-30DOI: 10.15231/jksc.2023.28.3.011
Junwoo Jung, Daesik Kim, Jaemin Beak
This paper presents a method for detecting the system instability in gas turbine combustor. The proposed approach is designed as the convolutional autoencoder technique so that it offers strong attractivity even if it has a very little data. Additionally, given that it is a solution to enhance the learning effect in this system, it also provides convenience of use to practicing engineers. From these benefits, the detection rate of the system instability in the proposed method is improved while in operation, which is compared with that in both a root-mean-square and a zero-crossing approaches as well-known statistic methods.
{"title":"Detection of Combustion Instability of Gas Turbine Combustor using Convolutional Autoencoder Model","authors":"Junwoo Jung, Daesik Kim, Jaemin Beak","doi":"10.15231/jksc.2023.28.3.011","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.3.011","url":null,"abstract":"This paper presents a method for detecting the system instability in gas turbine combustor. The proposed approach is designed as the convolutional autoencoder technique so that it offers strong attractivity even if it has a very little data. Additionally, given that it is a solution to enhance the learning effect in this system, it also provides convenience of use to practicing engineers. From these benefits, the detection rate of the system instability in the proposed method is improved while in operation, which is compared with that in both a root-mean-square and a zero-crossing approaches as well-known statistic methods.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127460","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 : 2023-09-30DOI: 10.15231/jksc.2023.28.3.001
Si-Hyun Cho, Gyeong-Min Kim, Yoon-Ho Bae, Yongsub Kim, Chung-Hwan Jeon
A typical technical problem in a hydrogen society is the difficulty of securing the economic efficiency of hydrogen storage and long-distance transportation. To overcome this issue, a hydrogen carrier is needed that can convert hydrogen to other forms of compounds. Ammonia, in particular, has many practical advantages among hydrogen carriers and is drawing attention as a very suitable substance. Therefore, cracking technology using ammonia into high-purity hydrogen is necessary. In this research, a numerical CFD model of ammonia cracker was developed. Flow and heat transfer characteristics were analyzed by numerical model. Non-uniform temperature distribution causes local cracking reaction of ammonia, and adversely affects hydrogen production process. This research can be used to design large-scale ammonia cracker and efficient hydrogen production process and can contribute to build a hydrogen infrastructure for hydrogen storage/transport/utilization system.
{"title":"Numerical Analysis of Ammonia Cracker using Porous Catalyst for Hydrogen Production","authors":"Si-Hyun Cho, Gyeong-Min Kim, Yoon-Ho Bae, Yongsub Kim, Chung-Hwan Jeon","doi":"10.15231/jksc.2023.28.3.001","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.3.001","url":null,"abstract":"A typical technical problem in a hydrogen society is the difficulty of securing the economic efficiency of hydrogen storage and long-distance transportation. To overcome this issue, a hydrogen carrier is needed that can convert hydrogen to other forms of compounds. Ammonia, in particular, has many practical advantages among hydrogen carriers and is drawing attention as a very suitable substance. Therefore, cracking technology using ammonia into high-purity hydrogen is necessary. In this research, a numerical CFD model of ammonia cracker was developed. Flow and heat transfer characteristics were analyzed by numerical model. Non-uniform temperature distribution causes local cracking reaction of ammonia, and adversely affects hydrogen production process. This research can be used to design large-scale ammonia cracker and efficient hydrogen production process and can contribute to build a hydrogen infrastructure for hydrogen storage/transport/utilization system.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127296","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 : 2023-09-30DOI: 10.15231/jksc.2023.28.3.028
Daesik Kim, Min-Kuk Kim
The fuel conversion for a stationary gas turbine from conventional LNG to hydrogen is recognized as a key technology for carbon neutrality in power generation. However, the present NOx reporting method does not properly evaluate NOx generated from hydrogen combustion. The current standard uses NOx, which has been corrected to the reference oxygen concentration(15%) after complete extraction of H₂O from the exhaust gas. For a hydrogen combustion, the concentration of H₂O and O₂ in the exhaust gas increases more than that of hydrocarbon fuels, resulting in over-reporting the actual NOx emission. In this study, under the operating conditions of hydrogen turbines currently being developed, NOx is calculated to be 39.6% over actual emissions affecting the environment. Therefore, it is very important and urgent to establish a new and appropriate NOx reporting method to accurately consider the characteristics of hydrogen combustion.
{"title":"Review on Reporting Method of NOx for a Hydrogen Turbine","authors":"Daesik Kim, Min-Kuk Kim","doi":"10.15231/jksc.2023.28.3.028","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.3.028","url":null,"abstract":"The fuel conversion for a stationary gas turbine from conventional LNG to hydrogen is recognized as a key technology for carbon neutrality in power generation. However, the present NOx reporting method does not properly evaluate NOx generated from hydrogen combustion. The current standard uses NOx, which has been corrected to the reference oxygen concentration(15%) after complete extraction of H₂O from the exhaust gas. For a hydrogen combustion, the concentration of H₂O and O₂ in the exhaust gas increases more than that of hydrocarbon fuels, resulting in over-reporting the actual NOx emission. In this study, under the operating conditions of hydrogen turbines currently being developed, NOx is calculated to be 39.6% over actual emissions affecting the environment. Therefore, it is very important and urgent to establish a new and appropriate NOx reporting method to accurately consider the characteristics of hydrogen combustion.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127288","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 : 2023-09-30DOI: 10.15231/jksc.2023.28.3.020
Seungmin Guk, Seonghyun Seo, Minwoo Lee
Thermoacoustic combustion instabilities arising from the interaction between the unsteady heat release rate and the combustor acoustic mode continue to hamper the development and operation of continuous combustion systems. In this study, we analyze the thermoacoustic dynamics in an annular model gas-turbine combustor, specifically focusing on the bifurcation behavior and the noise-induced dynamics. For this purpose, we transversely excite the combustor with stochastic signals of varying intensity. We find that a supercritical bifurcation occurs for a transverse thermoacoustic mode, and investigate the dynamics of that mode using the noise-induced dynamics of the flame. The devices and the framework used in this study can potentially serve as a platform for investigating the wide variety of noise-induced behavior in an annular combustor.
{"title":"Thermoacoustic Dynamics in an Annular Model Gas-turbine Combustor under Transverse Stochastic Forcing","authors":"Seungmin Guk, Seonghyun Seo, Minwoo Lee","doi":"10.15231/jksc.2023.28.3.020","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.3.020","url":null,"abstract":"Thermoacoustic combustion instabilities arising from the interaction between the unsteady heat release rate and the combustor acoustic mode continue to hamper the development and operation of continuous combustion systems. In this study, we analyze the thermoacoustic dynamics in an annular model gas-turbine combustor, specifically focusing on the bifurcation behavior and the noise-induced dynamics. For this purpose, we transversely excite the combustor with stochastic signals of varying intensity. We find that a supercritical bifurcation occurs for a transverse thermoacoustic mode, and investigate the dynamics of that mode using the noise-induced dynamics of the flame. The devices and the framework used in this study can potentially serve as a platform for investigating the wide variety of noise-induced behavior in an annular combustor.","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135127467","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 : 2023-06-30DOI: 10.15231/jksc.2023.28.2.057
Youngjun Shin, C. Choi, H. Jeong, Seonghwi Jo, Eun-Seong Cho
{"title":"Study on Combustion Characteristics of Multi-tube H₂ Nozzles","authors":"Youngjun Shin, C. Choi, H. Jeong, Seonghwi Jo, Eun-Seong Cho","doi":"10.15231/jksc.2023.28.2.057","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.2.057","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":"1 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41406313","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 : 2023-06-30DOI: 10.15231/jksc.2023.28.2.067
Minwoo Lee
{"title":"Numerical Aspects of Noise-Induced Dynamics in Continuous Combustion Systems","authors":"Minwoo Lee","doi":"10.15231/jksc.2023.28.2.067","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.2.067","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44657111","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 : 2023-06-30DOI: 10.15231/jksc.2023.28.2.038
Yong-Jea Kim, M. Choi, Kanghwan Kim, D. Shin
{"title":"Comparisons of Flame Stretch Calculation Models and Their Applications Part II: Model Applications","authors":"Yong-Jea Kim, M. Choi, Kanghwan Kim, D. Shin","doi":"10.15231/jksc.2023.28.2.038","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.2.038","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44313368","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 : 2023-06-30DOI: 10.15231/jksc.2023.28.2.011
Jaemin Lee, Eun-Seong Cho
{"title":"Study on Zero Carbon Fuels for Gas Turbine Application","authors":"Jaemin Lee, Eun-Seong Cho","doi":"10.15231/jksc.2023.28.2.011","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.2.011","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49314893","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 : 2023-06-30DOI: 10.15231/jksc.2023.28.2.022
Yong-Jea Kim, D. Shin
{"title":"Comparisons of Flame Stretch Calculation Models and Their Applications Part I:\u0000Model Comparisons","authors":"Yong-Jea Kim, D. Shin","doi":"10.15231/jksc.2023.28.2.022","DOIUrl":"https://doi.org/10.15231/jksc.2023.28.2.022","url":null,"abstract":"","PeriodicalId":42247,"journal":{"name":"Journal of the Korean Society of Combustion","volume":" ","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46272611","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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