TY - JOUR AU - Szentannai, Pál AU - Szűcs, Tibor AU - Pudleiner, Bálint AU - Fekete, Tamás TI - Transient phenomena and their consideration in load-following control of nuclear power plants JF - THERMAL SCIENCE J2 - THERM SCI VL - 2024 OnLine-First PY - 2024 IS - 00 SP - 52 PG - 14 SN - 0354-9836 DO - 10.2298/TSCI230805052S UR - https://m2.mtmt.hu/api/publication/34727699 ID - 34727699 AB - Radical changes have been happening on the source side of the electricity system due to the rolling back of large-sized fossil-fueled power plants and the coming to the front of uncontrollable renewables. As a worldwide consequence, to ensure the permanent balance of the grid, even big-sized units have to be operated in load- following mode, including also nuclear power plants. This mode is conducted by the control system, which must also consider the side effects of this rather dynamic operating mode. In this report, we show up all components of such a control system, including the process model, structural integrity assessment, and control algorithm. All the above elements are discussed on the basis of a concrete example, and the resulting control behavior of the entire system is also shown. The results demonstrated that a significant reduction in the caused thermal stresses could be achieved while keeping the control quality practically unchanged. LA - English DB - MTMT ER - TY - JOUR AU - Szűcs, Tibor AU - Pudleiner, Bálint AU - Szentannai, Pál TI - Atomerőművek terhelésváltoztatásai során ébredő tranziens hőfeszültségek számítása [Calculating the transient thermal stresses during load changes in nuclear power plants] JF - MAGYAR ENERGETIKA J2 - MAGYAR ENERGETIKA VL - 30 PY - 2023 IS - 4 SP - 21 EP - 28 PG - 8 SN - 1216-8599 UR - https://m2.mtmt.hu/api/publication/34496153 ID - 34496153 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Szűcs, Tibor AU - Szentannai, Pál TI - Developing an all-round combustion kinetics model for nonspherical waste-derived solid fuels JF - CHEMICAL PAPERS / CHEMICKÉ ZVESTI J2 - CHEM PAP / CHEM ZVESTI VL - 75 PY - 2021 IS - 3 SP - 921 EP - 930 PG - 10 SN - 2585-7290 DO - 10.1007/s11696-020-01352-6 UR - https://m2.mtmt.hu/api/publication/32759571 ID - 32759571 N1 - Cited By :1 Export Date: 5 July 2022 CODEN: CHPAE Correspondence Address: Szűcs, T.; Department of Energy Engineering, Hungary; email: szucs@energia.bme.hu Funding text 1: This work was performed in the frame of the FIEK_16-1-2016-0007 project, implemented with the support provided from the National Research, Development and Innovation Fund of Hungary, financed under the FIEK_16 funding scheme. AB - The utilization of challenging solid fuels in the energy industry (especially the ones derived from wastes) has a big priority nowadays, as it is a valid option to keep the recent EU directive related to the decrease of landfills. However, there are serious technical challenges, connecting to the lack of knowledge about the behavior of these fuels in the combustion chamber. This paper discusses the specific aspects of developing particle models concerning the combustion of these non-conventional fuels. A new modeling approach is presented, using which it is possible to develop an all-round particle model that includes every significant influencing process. Moreover, it does not have any restrictions regarding the shape, size and the origin of the particle. As an integral component of this model, the distinctive aspects of intrinsic reaction kinetics related to waste fuels are presented as well. LA - English DB - MTMT ER - TY - THES AU - Szűcs, Tibor TI - Biomasszák és hulladékok égési jellegzetességeinek modellezése PB - Budapesti Műszaki és Gazdaságtudományi Egyetem PY - 2021 SP - 121 UR - https://m2.mtmt.hu/api/publication/32212888 ID - 32212888 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Szűcs, Tibor AU - Szentannai, Pál TI - Determining the mass-related reaction effectiveness factor of large, nonspherical fuel particles for bridging between intrinsic and apparent combustion kinetics JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 141 PY - 2020 IS - 2 SP - 797 EP - 806 PG - 10 SN - 1388-6150 DO - 10.1007/s10973-019-09085-9 UR - https://m2.mtmt.hu/api/publication/31024147 ID - 31024147 N1 - Cited By :2 Export Date: 11 March 2021 CODEN: JTACF Correspondence Address: Szűcs, T.; Department of Energy Engineering, Muegyetem rkp 9, Hungary; email: szucs@energia.bme.hu Funding details: Budapesti Műszaki és Gazdaságtudományi Egyetem, BME Funding details: Nemzeti Kutatási, Fejlesztési és Innovaciós Alap, NKFIA, TUDFO/51757/2019-ITM Funding text 1: Open access funding provided by Budapest University of Technology and Economics (BME). This work was supported by the National Research, Development and Innovation Fund of Hungary in the frame of FIEK_16-1-2016-0007 (Higher Education and Industrial Cooperation Center) project. The research reported in this paper has been supported by the National Research, Development and Innovation Fund (TUDFO/51757/2019-ITM, Thematic Excellence Program). Funding text 2: Open access funding provided by Budapest University of Technology and Economics (BME). This work was supported by the National Research, Development and Innovation Fund of Hungary in the frame of FIEK_16-1-2016-0007 (Higher Education and Industrial Cooperation Center) project. Funding text 3: The research reported in this paper has been supported by the National Research, Development and Innovation Fund (TUDFO/51757/2019-ITM, Thematic Excellence Program). Funding Agency and Grant Number: Budapest University of Technology and Economics (BME); National Research, Development and Innovation Fund of Hungary [FIEK_16-1-2016-0007]; National Research, Development and Innovation Fund [TUDFO/51757/2019-ITM] Funding text: Open access funding provided by Budapest University of Technology and Economics (BME). This work was supported by the National Research, Development and Innovation Fund of Hungary in the frame of FIEK_16-1-2016-0007 (Higher Education and Industrial Cooperation Center) project.r The research reported in this paper has been supported by the National Research, Development and Innovation Fund (TUDFO/51757/2019-ITM, Thematic Excellence Program). AB - The utilization of challenging solid fuels in the energy industry is urged by environmental requirements. The combustion kinetics of these fuel particles differs markedly from that of pulverized coal, mainly because of their larger sizes, irregular (nonspherical) shapes, and versatile internal pore structures. Although the intrinsic reaction kinetic measurements on very small amounts of finely ground samples of these particles are mostly available, a bridge toward their apparent reaction modeling is not evident. In this study, a method is introduced to build this bridge, the goodness of which was proved on the example of an industrially relevant biofuel. To do this, the results of a macroscopic combustion measurement with real samples in a well-modelable environment have to be used, and for considering some not negligible effects, 3D CFD modeling of the experimental environment is also to be applied. The outcome is the mass-related reaction effectiveness factor as a function of the rate of conversion. This variable can be considered as the active fraction of the entire particle mass on its periphery, and it can be used as the crucial element in modeling the combustion process of the same particle under other circumstances by including the actual boundary conditions. Another advantage of this method is its covering inherently the entire combustion process (water and volatile release, and char combustion) and also its applicability for reactors utilizing bigger particles like fluidized bed combustors. LA - English DB - MTMT ER - TY - JOUR AU - Szűcs, Tibor AU - Szentannai, Pál AU - Szilágyi, Imre Miklós AU - Bakos, László Péter TI - Comparing different reaction models for combustion kinetics of solid recovered fuel JF - JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY J2 - J THERM ANAL CALORIM VL - 139 PY - 2020 SP - 555 EP - 565 PG - 11 SN - 1388-6150 DO - 10.1007/s10973-019-08438-8 UR - https://m2.mtmt.hu/api/publication/30794251 ID - 30794251 N1 - Department of Energy Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Budapest, Hungary Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, Hungary Cited By :3 Export Date: 11 March 2021 CODEN: JTACF Correspondence Address: Szűcs, T.; Department of Energy Engineering, Hungary; email: szucs@energia.bme.hu Funding details: GINOP-2.2.1-15-2017-00084 Funding details: K 124212, TNN_16 123631, VEKOP-2.3.2-16-2017-00013 Funding details: FIEK 16-1-2016-0007 Funding details: Budapesti Műszaki és Gazdaságtudományi Egyetem, BME Funding details: European Commission, EC Funding details: Magyar Tudományos Akadémia, MTA, NKP-18-4-BME-238 Funding details: Emberi Eroforrások Minisztériuma, EMMI Funding details: European Regional Development Fund, FEDER Funding text 1: Open access funding provided by Budapest University of Technology and Economics (BME). This work was supported by the National Research, Development and Innovation Fund of Hungary in the frame of FIEK 16-1-2016-0007 (Higher Education and Industrial Cooperation Center) Project. I. M. Szil?gyi thanks for a J?nos Bolyai Research Fellowship of the Hungarian Academy of Sciences and an ?NKP-18-4-BME-238 New National Excellence Program of the Ministry of Human Capacities, Hungary. A GINOP-2.2.1-15-2017-00084, an NRDI K 124212 and an NRDI TNN_16 123631 Grant are acknowledged. The research with Project No. VEKOP-2.3.2-16-2017-00013 was supported by the European Union and the State of Hungary and co-financed by the European Regional Development Fund. The research reported in this paper was supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Nanotechnology and Materials Science research area of Budapest University of Technology (BME FIKP-NAT). AB - Possible utilization of SRF (solid recovered fuel) in the energy industry is a widely investigated topic, because even though it is economically feasible, its complex reactions make a steady operation hard to maintain. SRF is prepared as a mixture of the well-combustible (but not recyclable) parts of municipal and industrial waste, which consists of mainly various papers, plastics and textiles with very different combustion characteristics. To describe the kinetics of a complex sample like this, the utilization of more advanced methods is recommended. In this work, genetic algorithm was used to fit four different reaction models to thermogravimetric data measured in oxidative atmosphere, and the results were compared. It was concluded that the tested distributed activation energy model and the simple and expanded nth-order models offer only a slightly better fitting value for this special sample, which promotes the usage of the simpler first-order model. © 2019, The Author(s). LA - English DB - MTMT ER - TY - CHAP AU - Szűcs, Tibor AU - Pekkerné Jakab, Emma AU - Szentannai, Pál ED - Gróf, Gyula István TI - Macroscopic and microscopic changes during the combustion process of non-tyre rubber waste particles T2 - 13th International Conference on Heat Engines and Environmental Protection Proceedings PB - BME Energetikai Gépek és Rendszerek Tanszék CY - Budapest SN - 9789633132807 PY - 2019 SP - 177 EP - 185 PG - 9 UR - https://m2.mtmt.hu/api/publication/3340305 ID - 3340305 LA - English DB - MTMT ER - TY - JOUR AU - Szentannai, Pál AU - Pláveczky, Gy AU - Sándor, Csaba AU - Szűcs, Tibor AU - Ősz, János AU - Renner, Károly Péter TI - A NEW DESIGN METHOD FOR FLUIDIZED BED CONVERSION OF LARGELY HETEROGENEOUS BINARY FUELS JF - THERMAL SCIENCE J2 - THERM SCI VL - 21 PY - 2017 IS - 2 SP - 1105 EP - 1118 PG - 14 SN - 0354-9836 DO - 10.2298/tsci150903066s UR - https://m2.mtmt.hu/api/publication/3144651 ID - 3144651 N1 - LA - English DB - MTMT ER - TY - GEN AU - Szűcs, Tibor AU - Szentannai, Pál TI - Combustion model for various shaped macro-sized solid fuel particles PY - 2017 UR - https://m2.mtmt.hu/api/publication/3340308 ID - 3340308 N1 - Konferencia-előadás. LA - English DB - MTMT ER - TY - CONF AU - Szücs, Botond AU - Szűcs, Tibor AU - Szentannai, Pál TI - The Mid-scale Experimental FBC Facility and Succesfull Projects at BME T2 - 72nd IEA-FBC Meeting PY - 2016 PG - 15 UR - https://m2.mtmt.hu/api/publication/3144751 ID - 3144751 LA - English DB - MTMT ER -