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    Wyświetlanie 1-15 z 15
    Tytuł:
    A novel Data Envelopment Analysis model with complex numbers : measuring the efficiency of electric generators in steam power plants
    Autorzy:
    Esfandiari, Mahmood
    Saati, Saber
    Navabakhsh, Mehrzad
    Khalili-Damghani, Kaveh
    Powiązania:
    https://bibliotekanauki.pl/articles/406274.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Data Envelopment Analysis
    power plant
    power plant efficiency
    complex numbers
    Opis:
    The output of a generator in power plant is the electricity, and it consists of two parts, active and reactive power. These quantities are expressed as complex numbers in which the real part is the active power and the imaginary part is the reactive power. Reactive power plays an important role in an electricity network. Ignoring it will exclude a lot of information. With regard to the importance of the generators in power plants, surely, calculating the efficiency of these units is of great importance. Data Envelopment Analysis (DEA) is a nonparametric approach to measure the relative efficiency of Decision-Making Units (DMUs). Since the generators data are complex numbers, thus, if we the use classical DEA models in order to measure the efficiency of the generators in power plants, the reactive power cannot be considered, and the measurement is limited to the real number of electric power. In this paper, a new DEA model with complex numbers is developed in order to assess the performance of the power plant generators.
    Źródło:
    Operations Research and Decisions; 2019, 29, 4; 41-52
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooling water flow influence on power plant unit performance for various condenser configurations setup
    Autorzy:
    Dobkiewicz-Wieczorek, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/2091367.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cooling water
    power plant efficiency
    cooling water flow control
    CHP plant
    efficiency
    Opis:
    This paper presents the influence of cooling water regulation on power plant net efficiency. It was examined whether, for the non-nominal low-pressure turbine load, it is justified to reduce the cooling water pump load, and how it would affect the unit net efficiency. Calculations for two types of power units were carried out: with condensing and extraction-condensing turbine. The tested condensing power plant consists of three surface condensers. The calculation included four condensers’ connections set up on the cooling water side to check how the cooling water system pressure drop affects the net unit performance. The result has confirmed that implementing serial connection decreases net efficiency when cooling water flow regulation is used, but the mixed connection should be applied when pump load is not controlled. It was proved that the cooling water flow control gives a profit for both units. Net efficiency for combined heat and power plant can be improved by 0.1–0.5 pp, the gain is remarkable below 60% of the low-pressure turbine part load. Flow control implementation in the unit with condensing turbine water control gives a similar profit just below 80% of the turbine load. Next, an influence of the additional limitations of a cooling water system (minimal total pump head, cooling tower) affecting the feasibility of implementing the water control has been considered. Applying a multi-cell forced draft cooling tower does not have a significant impact on results, but when a natural draft cooling tower is used, the flow control range is strongly reduced.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 1; 141--167
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The improvement of environmental characteristics of the combined cycle power plant by the implementation of the carbon capture installation
    Autorzy:
    Kotowicz, J.
    Brzęczek, M.
    Job, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/134906.pdf
    Data publikacji:
    2015
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    combined cycle power plant
    post-combustion technology
    chemical absorption
    carbon capture installation
    power plant efficiency
    ecological characteristics
    Opis:
    The paper describes a combined cycle power plant with carbon capture installation in a post-combustion technology. Carbon dioxide is separated from flue gas by using a chemical absorption method with monoethanolamine (MEA) as a sorbent. Separated carbon dioxide is compressed in order to prepare for transportation to the storage place. This paper identifies the electric efficiencies and other characteristic parameters of power plants before and after implementation of CO2 capture installation, as well as the power plant efficiency drop, and the improvement of ecological characteristics related to the implementation of this installation. The implementation of the installation described herein is associated with the efficiency loss caused by the auxiliary power for additional installations. The CO2 separation installation is powered by heat energy required for reclaiming the sorbent. This energy is taken in the form of steam extracted from the steam cycle, thus reducing the steam turbine power output, while the CO2 compression installation is powered by electric energy.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2015, 44 (116); 19-24
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of the choice of live steam pressure in PWR nuclear power plant
    Autorzy:
    Laskowski, Rafał
    Smyk, Adam
    Jurkowski, Romuald
    Ancé, Julien
    Wołowicz, Marcin
    Uzunow, Nikołaj
    Powiązania:
    https://bibliotekanauki.pl/articles/2134928.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    live steam
    pressure
    efficiency
    power output
    nuclear power plant
    nuclear
    power
    plant
    performance
    entropy balance
    Opis:
    In commercially available generation III and III+ PWR (pressurized water reactor) reactors, pressure of steam produced in steam generators varies in a relatively wide range from 5.7 to 7.8 MPa. Therefore, it is important to ask which value of steam pressure should be used for a specific unit, taking into account different location conditions, the size of the power system and conditions of operation with other sources of electricity generation. The paper analyzes the effect of steam pressure at the outlet of a steam generator on the performance of a PWR nuclear power plant by presenting changes in gross and net power and efficiency of the unit for steam pressures in the range of 6.8 to 7.8 MPa. In order to determine losses in the thermal system of the PWR power plant, in particular those caused by flow resistance and live steam throttling between the steam generator and the turbine inlet, results concerning entropy generation in the thermal system of the power plant have been presented. A model of a nuclear power plant was developed using the Ebsilon software and validated based on data concerning the Olkiluoto Unit 3 EPR (evolutionary power reactor) power plant. The calculations in the model were done for design conditions and for a constant thermal power of the steam generator. Under nominal conditions of the Olkiluoto Unit 3 EPR power unit, steam pressure is about 7.8 MPa and the steam dryness fraction is 0.997. The analysis indicates that in the assumed range of live steam pressure the gross power output and efficiency increase by 32 MW and 0.735 percentage point, respectively, and the net power output and efficiency increase by 27.8 MW and 0.638 percentage point, respectively. In the case of all types of commercially available PWR reactors, water pressure in the primary circuit is in the range of 15.5−16.0 MPa. For such pressure, reducing the live steam pressure leads to a reduction in the efficiency of the unit. Although a higher steam pressure increases the efficiency of the system, it is necessary to take into account the limitations resulting from technical and economic criteria as well as operating conditions of the primary circuit, including the necessary DNBR (departure from nucleate boiling ratio) margin. For the above reasons, increasing the live steam pressure above 7.8 MPa (the value used in EPR units that have already been completed) is unjustified, as it is associated with higher costs of the steam generator and the high-pressure part of the turbine.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 85--109
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condensing power plant cycle - assessing possibilities of improving its efficiency
    Autorzy:
    Chmielniak, T.
    Łukowicz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/240030.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Elektrownie kondensacyjne
    poprawa efektywości
    condensing power plant
    Efficiency improvement
    Opis:
    This paper presents a method for assessing the degree of approaching the paper output of the Clausius-Rankine cycle to the Carnot cycle. The computations to illustrate its use were performed for parameters characteristic of the current state of development of condensing power plants as well as in accordance with predicted trends for their further enhancing. Moreover there are presented computations of energy dissipation in the machines and devices working in such a cycle.
    Źródło:
    Archives of Thermodynamics; 2010, 31, 3; 105-113
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermodynamic analysis of a combined cycle power plant located in Jordan: A case study
    Autorzy:
    Bataineh, Khaled
    Khaleel, Bara A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240565.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    combined cycle power plant
    energy efficiency
    exergy efficiency
    exergy destruction
    exergy losses
    Opis:
    Efficiency and electrical power output of combined cycle power plants vary according to the ambient conditions. The amount of these variations greatly affects electricity production, fuel consumption, and plant incomes. Obviously, many world countries have a wide range of climatic conditions, which impact the performance of power plants. In this paper, a thermodynamic analysis of an operating power plant located in Jordan is performed with actual operating data acquired from the power plant control unit. The analysis is performed by using first and second laws of thermodynamics. Energy and exergy efficiencies of each component of the power plant system are calculated and the effect of ambient temperature on the components performance is studied. The effects of gas turbine pressure ratio, gas turbine inlet temperature, load and ambient conditions on the combined cycle efficiency, power outputs and exergy destruction are investigated. Energy and exergy efficiencies of the combined cycle power plant are found as 45.29%, and 42.73% respectively when the ambient temperature is 34°C. Furthermore, it is found that the combustion chamber has the largest exergy destruction rate among the system components. The results showed that 73% of the total exergy destruction occurs in the combustion chamber when the ambient temperature is 34°C. Moreover, the results show that the second major exergy loss is in HRSC. The results show that the energy and exergy efficiency of the combined cycle power plant decreases as the ambient temperature increases. According to the calculation results, improvement and modification suggestions are presented.
    Źródło:
    Archives of Thermodynamics; 2020, 41, 1; 95-123
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of energy use and elimination of CO2 emissions in the life cycle of an offshore wind power plant farm
    Autorzy:
    Tomporowski, A.
    Flizikowski, J.
    Opielak, M.
    Kasner, R.
    Kruszelnicka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/258566.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    energy efficiency
    use of machines
    offshore wind power plant farms
    CO2 emissions
    Opis:
    Power stations in marine locations cause multi-faceted impact on the environment, man and the economy. There are not many studies devoted to modeling energy benefits for CO2 emissions. The paper presents the issues of assessing the efficiency of offshore wind farms, defined as the ratio of benefits to life cycle inputs. The scientific goal was to develop a mathematical model for efficiency in the design, manufacture, use and management of offshore wind power. The papers practical purpose is the experimental designation of the impact of selected post-use management methods, time of use and maritime location, i.e. average annual productivity of wind power plants on the efficiency of energy benefits from greenhouse gas emissions. The mathematical model of the integrated cost-benefit ratio has been developed for energy use assessment, taking into account the benefits generated by electricity production and the life-cycle CO2 emissions based on the LCA analysis using the CML method. Mathematical model validation was performed by determining the value of the indicator for an existing 2 MW offshore wind farm and comparatively for fossil fuel production: lignite, stone, fuel oil and natural gas. Analytical and research work carried out showed that the higher the efficiency index, the higher the value of the indicator. It has been shown that the location of the power station at sea produces more favorable CO2 elimination rates, due to higher productivity compared to in-land wind power plants. A more favorable form of post-consumer management for CO2 has been determined as recycling. It was found that for electricity generated from offshore wind farms, the value of the energy efficiency benefit from CO2 emissions is higher than for fossil fuel energy production.
    Źródło:
    Polish Maritime Research; 2017, 4; 93-101
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying the Efficiency of Treatment Model Mixtures of Petroleum Products with the Modified Sorbent Made of Ash-and-Slag During Dynamic Sorption
    Autorzy:
    Korotkova, Tatyana Germanovna
    Bushumov, Svyatoslav Andreevich
    Ksandopulo, Svetlana Yurevna
    Solonnikova, Nataliya Vladimirovna
    Powiązania:
    https://bibliotekanauki.pl/articles/123373.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ash and slag
    thermal power plant
    sorbent
    sorption dynamics
    efficiency
    petroleum products
    extraction
    Opis:
    Experimental studies on the dynamic sorption of model mixtures containing petroleum products were performed. The subject of the study was the modified sorbent from the ash-and-slag wastes accumulated in the ash dump of the Novocherkassk State District Power Plant (SDPP) (Russia, Novocherkassk, Rostov Region), obtained using the method of ash removal. The quantity of the sorbent for each model solution was fixed at 5.0 g. The model solutions in the amount of 1 dm3 were passed through a column filled with the modified sorbent at constant filtration rate w = const with filtrate takeout of 0.1 dm3/min. The pH value of the solution, which is advisable for extracting petroleum products, was determined experimentally. For this purpose, the model solutions, containing 100 mg/dm3 of petroleum products with pH = 1.65, 4.01, 6.86, 8.12, 9.18, and 11.34, were prepared. The optimum pH value of the solution was considered pH = 7.5. The content of petroleum products in the filtrate in all experiments was determined using IR spectrometry. The working range of water pollution with petroleum products was determined on a series of model solutions containing petroleum products in the range between 0.5 and 10 mg/dm3 with the increment of 0.5, between 10 and 100 mg/dm3 with the increment of 10, and between 100 and 1,000 mg/dm3 with the increment of 100. The maximum extraction of petroleum products from the solution was 88.23%. The applicability of the Henry’s law to the range of petroleum products concentrations in the filtrate of 50 mg/dm3 was confirmed. The adsorption equilibrium constant (Henry’s law constant) was determined experimentally. The effect of the natural freshwater matrix on the degree of petroleum products extraction was studied; no significant effect on petroleum products sorption was found. A conclusion was made that the sorbent can ensure the efficiency of water purifying from petroleum products of no less than 85% in the range of pollution between 5 and 300 mg/dm3.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 11; 202-209
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical thermodynamic optimization of supercritical coal fired power plant with support of IPSEpro software
    Autorzy:
    Elsner, W.
    Kowalczyk, Ł.
    Marek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/240118.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optymalizacja termodynamiczna
    siłownia nadkrytyczna
    symulacja
    wydajność
    efficiency
    simulation
    supercritical power plant
    thermodynamic optimization
    Opis:
    The paper presents a thermodynamic optimization of supercritical coal fired power plant. The aim of the study was to optimize part of the thermal cycle consisted of high-pressure turbine and two chosen high-pressure feed water heaters. Calculations were carried out using IPSEpro software combined with MATLAB, where thermal efficiency and gross power generation efficiency were chosen as objective functions. It was shown that the optimization with newly developed framework is sufficiently precise and its main advantage is the reduction of computation time on comparison to the classical method. The calculations have shown the tendency of the increase in efficiency, with the rise of a number of function variables.
    Źródło:
    Archives of Thermodynamics; 2012, 33, 3; 101-110
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital transformation of energy efficiency at Ukrainian NPPs
    Cyfrowa transformacja w zakresie efektywności energetycznej w ukraińskich elektrowniach jądrowych
    Autorzy:
    Stanislavskyi, Vladyslav Gennadyevich
    Powiązania:
    https://bibliotekanauki.pl/articles/1840765.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    Ukrainian power plant
    digitalization
    energy efficiency
    digital transformation
    ukraińska elektrowania jądrowa
    cyfryzacja
    efektywność energetyczna
    transformacja cyfrowa
    Opis:
    In this article, the author will try to conditionally transform the energy capacities of NNEGC Energoatom by converting a liability into an asset using the example of bitcoin. With a surplus of nuclear power generation, one of the modern tools for using excess electricity is directing it to cryptocurrency mining. The author of the article will try to calculate the possibilities of Ukrainian NPPs in the cryptoindustry market by analyzing the competitiveness, market trends and the approximate profitability of this kind of activity. The essence of the article lies in the intervention of the state energy giant in completely new activities, partial monopolization of the market and interference in the activities of decentralized cryptocurrencies, as well as the very novelty of combining two different fields of activity and the global nature of the consequences. Mining can be used to convert the underdeveloped electricity or all of Energoatom’s capacities totally, but at the same time it can also affect the cryptoasset market in the field of decentralization, as the primary cost factor to affect the price of assets and allow for obtaining super-profits at a state enterprise. The author of the article tries to understand the profitability of such actions and, in general, to understand the globality of the idea. The results of the entry of the national energy giant into the cryptoasset market will change the global processes in the ecosystem of the cryptoindustry and change the situation both on the electricity market in the region and, in general, will affect the processes of globalization and unification of the financial sectors of the economy.
    W artykule autor bada teoretyczne możliwości przekształcenia zobowiązań zdolności produkcyjnych NNEGC Energoatom w aktywa, na przykładzie bitcoina. Przy nadwyżce produkcji energii jądrowej jednym z nowoczesnych narzędzi wykorzystania nadwyżki energii elektrycznej jest użycie jej do wydobycia kryptowalut. Autor szacuje możliwości ukraińskich elektrowni jądrowych na rynku kryptowalut poprzez analizę konkurencyjności, trendów rynkowych oraz przybliżoną analizę opłacalności tego rodzaju działalności. Istota przedstawionej analizy polega na ingerencji państwowego giganta energetycznego w zupełnie nowe działania, częściowej monopolizacji rynku i wejście na rynek zdecentralizowanych kryptowalut. Nowością jest tu łączenie dwóch odmiennych dziedzin działalności, a także globalny charakter konsekwencji takich działań. Wydobycie kryptowalut może być wykorzystane do konwersji zbyt wysokich mocy produkcyjnych Energoatomu, ale jednocześnie może również wpłynąć na rynek kryptowalut poprzez jego decentralizację, ponieważ podstawowy czynnik kosztowy wpływa na cenę aktywów i pozwala na uzyskanie nadwyżki zysków w przedsiębiorstwie państwowym. Autor stara się zrozumieć opłacalność takich działań i jak ogólna jest taka idea. Skutki wejścia krajowego giganta energetycznego na rynek kryptowalut zmienią globalne procesy w ekosystemie branży kryptowalut i sytuację zarówno na rynku energii elektrycznej w regionie, jak i całościowo wpłyną na procesy globalizacji i unifikacji sektorów finansowych gospodarki.
    Źródło:
    Polityka Energetyczna; 2020, 23, 4; 155-166
    1429-6675
    Pojawia się w:
    Polityka Energetyczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The small hydroelectric power stations as an element of the multifunctional development of rural areas
    Autorzy:
    Bukowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/573382.pdf
    Data publikacji:
    2007
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    small hydroelectrical power station
    power station
    multifunctional development
    rural area
    hydroelectrical power station
    alternative energy
    energy source
    alternative source
    renewable energy
    market
    economic efficiency
    renewable source
    cost
    small hydropower plant
    hydropower plant
    Opis:
    Poland’s accession to the EU has caused a necessity of harmonising Polish with the union law also in the field of energy law. It also enforces achievement of 7,5% share of energy from alternative sources in the total energy consumption in 2010. Execution of this international commitment will require more economic and legal support from the state. The development of alternative sources of energy creates chances of development of rural areas where these kinds of installations are being mostly located. This article presents an analysis of the economic efficiency of energy production on an example of 5 small hydroelectric power stations. The analysis is based on a comparison of full unit costs and unit revenue from energy sale. Bigger stations proved economically efficient while for the smaller the break even point is associated with an average water flow of 153 million m3/year.
    Źródło:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego; 2007, 01(16)
    2081-6960
    Pojawia się w:
    Zeszyty Naukowe Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie. Problemy Rolnictwa Światowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological efficiency assessment model for environmental safety management of wind power plant
    Autorzy:
    Kasner, Robert
    Flizikowski, Józef
    Tomporowski, Andrzej
    Kruszelnicka, Weronika
    Idzikowski, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/88582.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    wind power plant
    ecological efficiency
    renewable energy
    emission in life cycle
    elektrownia wiatrowa
    efektywność ekologiczna
    energia odnawialna
    Opis:
    This study focuses on the evaluation of the benefits and ecological costs that occur in the life cycle of a wind power plant. The study constitutes an attempt to expand upon previously conducted research on the analysis of costs and benefits in the stages of production, operation and post-consumer management of wind turbines. The aim of the study adopted research methodology, analysis and assessment of the benefits and environmental impacts of the Vestas V90/105m 2 MW wind turbine throughout its life cycle. Original assessment indicators of the benefits and ecological costs occurring throughout a wind power plant’s life cycle for environmental safety management, were proposed and verified.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 371-377
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conditions for increasing the recognition of degradation in thermal-flow diagnostics, taking into account environmental legal aspects
    Autorzy:
    Drosińska-Komor, Marta
    Głuch, Jerzy
    Brzezińska-Gołębiewska, Katarzyna
    Piotrowicz, Michał
    Ziółkowski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/41181077.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Warszawska, Instytut Techniki Cieplnej
    Tematy:
    steam turbine
    genethic algorithm
    diagnostic
    coal-fired power plant
    efficiency analysis
    turbina parowa
    algorytm genetyczny
    diagnostyka
    elektrownia węglowa
    Opis:
    The ever-increasing demand for electricity and the need for conventional sources to cooperate with renewable ones generates the need to increase the efficiency and safety of the generation sources. Therefore, it is necessary to find a way to operate existing facilities more efficiently with full detection of emerging faults. These are the requirements of Polish, European and International law, which demands that energy facilities operate with the highest efficiency and meet a number of restrictive requirements. In order to improve the operation of steam power plants of electric generating stations, thermal-fluid diagnostics have been traditionally used, and in this paper a three-hull steam turbine, having a high-pressure, a medium-pressure and a low-pressure part, has been selected for analysis. The turbine class is of the order of 200 MW electric. Genetic algorithms (GA) were used in the process of creating the diagnostic model. So far, they have been used for diagnostic purposes in gas turbines, and no work has been found in the literature using GA for the diagnostic process of such complex objects as steam turbines located in professional manufacturing facilities. The use of genetic algorithms allowed rapid acquisition of global extremes, that is efficiency and power of the unit. The result of the work undertaken is the possibility to carry out a full diagnostic process, meaning detection, localization and identification of single and double degradations. In this way 100 % of the main faults are found, but there are sometimes additional ones, and these are not perfectly identified especially for single time detection. Thus, the results showed that with a very high success rate the simulated damage to the geometrical elements of the steam turbine under study is found.
    Źródło:
    Journal of Power Technologies; 2023, 103, 1; 33-48
    1425-1353
    Pojawia się w:
    Journal of Power Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Supercritical power plant 600 MW with cryogenic oxygen plant and CCS installation
    Autorzy:
    Kotowicz, J.
    Dryjańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/240262.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CFB oxy boiler
    oxy-combustion system
    supercritical oxy power plant
    electricity generation efficiency
    cryogenic air separation
    kocioł oxy
    system spalania
    elektrownia
    sprawność wytwarzania energii elektrycznej
    kriogeniczny rozdział powietrza
    Opis:
    This article describes a thermodynamic analysis of an oxy type power plant. The analyzed power plant consists of: 1) steam turbine for supercritical steam parameters of 600°C/29 MPa with a capacity of 600 MW; 2) circulating fluidized bed boiler, in which brown coal with high moisture content (42.5%) is burned in the atmosphere enriched in oxygen; 3) air separation unit (ASU); 4) CO2 capture installation, where flue gases obtained in the combustion process are compressed to the pressure of 150 MPa. The circulated fluidized bed (CFB) boiler is integrated with a fuel dryer and a cryogenic air separation unit. Waste nitrogen from ASU is heated in the boiler, and then is used as a coal drying medium. In this study, the thermal efficiency of the boiler, steam cycle thermal efficiency and power demand were determined. These quantities made possible to determine the net efficiency of the test power plant.
    Źródło:
    Archives of Thermodynamics; 2013, 34, 3; 123-137
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lusatian lignite - sustainable mining to meet future climate change policy
    Lignit z terenów łużyckich - zrównoważona eksploatacja zgodnie z przyszłą polityką zmian klimatycznych
    Autorzy:
    Rolland, W.
    Ketzmer, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/348861.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    niezawodność
    otwartość
    skuteczność
    inwestycje przyszłościowe
    koncepcja przyszłego rozwoju kopalni odkrywkowych i elektrowni
    technologia CCS
    region energetyczny Łużyc i Szprewaldu
    reliability
    opennes
    efficiency
    future-oriented investments
    future mine and power plant development concept
    CCS technology
    energy region Lausitz/Spreewald
    Opis:
    For Vattenfall, it is an important aspect of their entrepreneurial activity to make lignite sustainable in a climate-political perspective, in particular with regard to the economic development of the region. Under the headline "Innovative Energy Region Lausitz-Spreewald" representatives of the company, educational and other institutions and last but not least of policy are dedicated to a future-oriented development of Lusatia. An essential element of the long-term mining and power plant concept is the development of the CCS (Carbon Capture and Storage) - technology. Around 2020 this technology should be available for low CO2 emission power generation based on lignite in commercial scale. Apart from climate-neutral lignite-based power generation, the expansion of the energy-economic know-how and the use of other energy sources are among others important topics. This also includes the use of wind energy on recultivation areas, generation of biogas from biomass for power generation and the capture of CO2 by microalgae. Of great importance is also the "low-energy housing" topic, in particular for future resettlement locations. Lignite has its place in the energy mix, because first of all lignite is a chance for the future, especially in Lusatia.
    Głównym aspektem działalności przedsiębiorczej koncernu Vattenfall, zwłaszcza w odniesieniu do rozwoju regionu, jest zapewnienie klimatyczno-politycznej perspektywy dla węgla brunatnego. Pod hasłem "Innowacyjny Region Energetyczny Łużyce-Spreewald" chodzi przedstawicielom koncernu, placówkom edukacyjnym, instytucjom i wreszcie też sferom politycznym o ustalenie kierunku przyszłego rozwoju Łużyc. Rozwój technologii CCS (Carbon, Capture and Storage) stanowi w tym ważną część składową długofalowej koncepcji górniczo-energetycznej. Około roku 2020 technologia ta ma być dostępna w skali przemysłowej do wytwarzania energii elektrycznej z węgla brunatnego przy zminimalizowanej emisji CO2. Ważnymi tematami oprócz neutralnej klimatycznie produkcji prądu z węgla brunatnego są mi in. rozwijanie energetyczno-ekonomicznego know-how oraz wykorzystanie innych nośników energii. Do tych ostatnich zalicza się m.in. wykorzystanie energii wiatru na terenach objętych rekultywacją po eksploatacji węgla, pozyskiwanie biogazu z biomasy do wytwarzania prądu oraz wiązanie CO2 za pomocą mikroglonów. Duże znaczenie ma także tematyka "osiedli energooszczędnych", zwłaszcza dla przyszłych osiedli zastępczych, budowanych na przesiedlenia z terenów zajmowanych pod kopalnie. Węgiel brunatny zajmuje stałą pozycję w strukturze nośników energii, bowiem węgiel brunatny jest w pierwszym rzędzie szansą na przyszłość i to przede wszystkim dla Łużyc.
    Źródło:
    Górnictwo i Geoinżynieria; 2009, 33, 2; 401-408
    1732-6702
    Pojawia się w:
    Górnictwo i Geoinżynieria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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