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Wyszukujesz frazę "fuel ratio" wg kryterium: Temat


Tytuł:
Characteristics of Char from Low-Rank Coal Gasification
Autorzy:
Asof, Marwan
Arita, Susila
Andalia, Winny
Powiązania:
https://bibliotekanauki.pl/articles/24201706.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
low-grade coal
charcoal
fuel ratio
gasification
Opis:
The coal gasification process in this study aimed to increase the quality of low-rank coal (LRC) from lignite type to coal with semi-anthracite and anthracite grades with higher fixed carbon values. The gasification process was carried out at temperatures between 700-900 °C. In the initial stages of the study, the relationship between the increase in gasification temperature with the mass of coal and the gasification process time was investigated. The proximate and ultimate analysis was carried out to determine the characteristics of the raw materials used and the coal char produced from combustion. The analysis results are used to calculate the fuel ratio, where the fuel ratio is a parameter to determine the grade of coal. In addition, an SEM-spot EDS analysis was carried out on the gasified coal solids to ensure the fixed carbon content produced from the above process. The results showed that the gasification process could raise the grade of LRC into char products with semi-anthracite to anthracite, where the fuel ratio reached 10.84. From the product analysis results, the LRC coal gasification results using SEM-EDS showed that carbon reached 98.58%. The remaining inorganic elements in the product are less than 1.5%, such as Al, Si and K.
Źródło:
Journal of Ecological Engineering; 2023, 24, 4; 78--84
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of a combined cycle power plant due to auxiliary heating from the combustion chamber of the gas turbine topping cycle
Autorzy:
Khan, Mohammad Nadeem
Powiązania:
https://bibliotekanauki.pl/articles/1845501.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pressure ratio
air-fuel ratio
supplement heating
exergy analysis
energy analysis
Opis:
Energy demand is increasing exponentially in the last decade. To meet such demand there is an urgent need to enhance the power generation capacity of the electrical power generation system worldwide. A combined-cycle gas turbines power plant is an alternative to replace the existing steam/gas electric power plants. The present study is an attempt to investigate the effect of different parameters to optimize the performance of the combined cycle power plant. The input physical parameters such as pressure ratio, air fuel ratio and a fraction of combustible product to heat recovery heat exchanger via gas turbine were varied to determine the work output, thermal efficiency, and exergy destruction. The result of the present study shows that for maximum work output, thermal efficiency as well as total exergy destruction, extraction of combustible gases from the passage of the combustion chamber and gas turbine for heat recovery steam generator is not favorable. Work output and thermal efficiency increase with an increase in pressure ratio and decrease in air fuel ratio but for minimum total exergy destruction, the pressure ratio should be minimum and air fuel ratio should be maximum.
Źródło:
Archives of Thermodynamics; 2021, 42, 1; 147-162
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of renewable energy sources on air-fuel ratio
Autorzy:
Torok, A.
Zoldy, M.
Csefalvay, E.
Powiązania:
https://bibliotekanauki.pl/articles/242855.pdf
Data publikacji:
2018
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
air-fuel ratio
lambda
gasoline
ethanol
combustion engine
air pollution
environmental protection
Opis:
Environmental emission of road transport is a key problem. Periodic environmental test are designed to ensure minimum emission. Periodic checks are based on measurements. In this emission measurements fuel type plays an important role. The Brettschneider equation is a method used to compare the idealized and actual air fuel ratio. Brettschneider established a method to calculate ratio of oxygen to fuel by comparing the ratio of oxygen molecules to carbon and hydrogen molecules in the exhaust. In this article, authors have investigated blended ethanol effect on idealized and actual air fuel ratio based on Brettschneider equation. The main result of the article that blended ethanol has insignificant effect on air-fuel ratio. The article presents inter alia difference in stoichiometric air fuel ratios in case of different fuels, changes in λ due to blending ethanol and comparison of influence of emissions of different types of transport. In the article authors focus particularly on periodic checks and gasoline driven cars. The main research question was if ethanol blends have effect on idealized and actual air fuel ratio based on Brettschneider equation
Źródło:
Journal of KONES; 2018, 25, 3; 473-477
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Real-time implementation of multiple model based predictive control strategy to air/fuel ratio of a gasoline engine
Autorzy:
Wojnar, S
Polóni, T
Šimončič, P
Rohal’-Ilkiv, B
Honek, M
Csambál, J
Powiązania:
https://bibliotekanauki.pl/articles/229632.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
model predictive control
multiple models
air/fuel ratio
spark ignition engine
ARX models
Opis:
Growing safety, pollution and comfort requirements influence automotive industry ever more. The use of three-way catalysts in exhaust aftertreatment systems of combustion engines is essential in reducing engine emissions to levels demanded by environmental legislation. However, the key to the optimal catalytic conversion level is to keep the engine air/fuel ratio (AFR) at a desired level. Thus, for this purposes more and more sophisticated AFR control algorithms are intensively investigated and tested in the literature. The goal of this paper is to present for a case of a gasoline engine the model predictive AFR controller based on the multiple-model approach to the engine modeling. The idea is to identify the engine in particular working points and then to create a global engine's model using Sugeno fuzzy logic. Opposite to traditional control approaches which lose their quality beside steady state, it enables to work with satisfactory quality mainly in transient regimes. Presented results of the multiple-model predictive air/fuel ratio control are acquired from the first experimental real-time implementation on the VW Polo 1390 cm3 gasoline engine, at which the original electronic control unit (ECU) has been fully replaced by a dSpace prototyping system which execute the predictive controller. Required control performance has been proven and is presented in the paper.
Źródło:
Archives of Control Sciences; 2013, 23, 1; 93-106
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Emission of Carbon Monoxide and Nitrogen Oxides from Boilers Supplied by a Pellet under the Influence of Changes in the Air-Fuel Equivalence Ratio
Autorzy:
Ciupek, Bartosz
Judt, Wojciech
Urbaniak, Rafał
Kłosowiak, Robert
Powiązania:
https://bibliotekanauki.pl/articles/124554.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heating boiler
wood pellet
air-fuel equivalence ratio
carbon monoxide
CO
nitrogen oxides
NOx
Opis:
The aim of the experimental research was to determine the impact of changes in the air-fuel equivalence ratio during the combustion of wood pellet in the boiler on the CO and NOx emissions. In order to realize the tests, 10 kW wood pellet boiler equipped with a dedicated wood pellet burner was employed. On the basis of the research, the relationship between the level of harmful substances emitted under the influence of changes in the air-fuel equivalence ratio was presented. The obtained results and conclusions based on them can be used to optimize the design of heating devices fed by wood pellets.
Źródło:
Journal of Ecological Engineering; 2019, 20, 10; 34-38
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena fluktuacji składu mieszanki wysterowanej z cyklu na cykl w silniku z pośrednim wtryskiem benzyny
Estimation of cycle-to-cycle variations of the air-fuel ratio in an engine with indirect gasoline injection
Autorzy:
Nita, J.
Wołczyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/133819.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
silnik benzynowy
napełnienie cylindra
cyklowy skład mieszanki
sterowanie z cyklu na cykl
spark ignition engine
cylinder fill
cycle-to-cycle air-fuel ratio
cycle-to-cycle control
Opis:
W publikacji przedstawiono wyniki badań nad fluktuacją wysterowanego składu mieszanki paliwowo-powietrznej w wolnossącym silniku o zapłonie iskrowym z wtryskiem pośrednim wielopunktowym benzyny. Skład mieszanki wysterowano według opracowanego we własnym zakresie algorytmu. Jego znamienną cechą jest konstytuowanie mieszanki w cylindrze o wymaganym składzie w trybie z cyklu na cykl. Ocenę fluktuacji tak wysterowanego składu mieszanki wykonano na bazie wyników z badań hamownianych silnika w wybranych stanach ustalonych i przejściowych. Otrzymane wyniki porównano z wynikami przedstawionymi w pracy [1], uzyskanymi dla fabrycznego sterowania w tym silniku. Analiza porównawcza wykazała obniżenie fluktuacji składu mieszanki wysterowanej opracowanym systemem. Badania wskazały ponadto kierunki dalszego doskonalenia opracowanego sposobu sterowania.
The paper presents results of investigation on cycle-to-cycle variations of the air-fuel ratio in a naturally-aspirated spark ignition engine with an indirect multipoint fuel injection. The air-fuel ratio was controlled with the application of an algorithm developed by the authors. Its characteristic feature is the ability to adjust a required air-fuel ratio from cycle to cycle. Estimation of cycle-to-cycle variations was carried out on the basis of the engine test bed investigation under transient and steady operating conditions. The obtained results were compared to those presented in [1], obtained for manufacturer's parameters. The comparative analysis has revealed decreased variations of the air-fuel ratio controlled with the application of the developed system. Additionally, the results indicated further improvement directions of the developed control system.
Źródło:
Combustion Engines; 2013, 52, 3; 1002-1010
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conditions for optimizing powertrain performance in a vehicle with an internal combustion engine
Autorzy:
Janulin, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1835548.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
optimization
powertrain
gear ratio
vehicle energy efficiency
fuel consumption
Opis:
The paper presents optimization of the drive system in terms of adapting it to the characteristics of another engine. Powertrain parameters in a vehicle with an internal combustion engine were selected based on the following criteria: fuel consumption, engine dynamics, and emission standards for harmful substances. A light-duty passenger vehicle with gross vehicle weight rating (GVWR) of 3.5 tons was modified by replacing a spark-ignition engine with a diesel engine. The gear ratio in the powertrain had to be modified accordingly to optimize the engine’s performance, enhance engine dynamics, minimize fuel consumption and toxic emissions. The optimization of selected parameters of the vehicle driveline was performed based on the requirements of the standard NEDC and WLTC cycles.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2020, nr 23(4); 291-307
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigation on performance of a spark ignition engine runs with alcoholic blend-gasoline
Autorzy:
Ahmed, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/243048.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
methanol
ethanol
butanol
compression ratio
specific fuel consumption
exhaust gas temperature
performance
Opis:
In this paper performance resulted from a single cylinder spark-ignition engine fuelled with 20% by volume of methanol, ethanol, and butanol was studied and compared to gasoline. The experiments were conducted at variable speed and maximum torques. The conditions of stoichiometric air–fuel ratio at wide-open throttle were used. The tests were perfumed at higher useful compression ratio of the used Iraqi gasoline. The test results show that the higher compression ratio for the tested gasoline was 7.5:1. So an Iraqi conventional gasoline has engine HUCR=7.5:1 and its OST= 19 ºBTDC, this compression ratio can be considered low. Adding 20% of alcoholic blends by volume to gasoline improved the engine performance. Within the tested speed range, alcoholic blends produced higher brake powers, volumetric efficiency and thermal efficiency. In addition, it resulted in lower exhaust gases temperatures. The brake specific fuel consumption of the tested alcoholic blend was higher than that for gasoline.
Źródło:
Journal of KONES; 2015, 22, 3; 249-256
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ stopnia sprężania na wybrane parametry procesu spalania w silniku o zapłonie samoczynnym zasilanym dwupaliwowo gazem ziemnym i olejem napędowym
Effect of the compression ratio on selected combustion process parameters in a natural gas fuelled compression ignition engine operating in a dual-fuel mode
Autorzy:
Luft, S.
Skrzek, T.
Powiązania:
https://bibliotekanauki.pl/articles/133813.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
stopień sprężania
silnik dwupaliwowy
proces spalania
gaz naturalny
compression ratio
dual-fuel engine
combustion process
natural gas
Opis:
Artykuł dotyczy zagadnień wpływu stopnia sprężania dwupaliwowego silnika o zapłonie samoczynnym zasilanego gazem naturalnym CNG na wybrane parametry procesu spalania. W ramach badań dokonano rejestracji przebiegu ciśnień w komorze spalania w funkcji obrotu wału korbowego dla różnych wartości stopnia sprężania. Zarejestrowane charakterystyki pozwoliły na wyznaczenie takich parametrów procesu spalania jak: ciśnienie maksymalne Pmax, średnia szybkość narastania ciśnienia (∆p/∆α)śr,maksymalna szybkość narastania ciśnienia (dp/dα)max, w funkcji momentu obrotowego M, oraz stopnia wypalenia dawki x w funkcji obrotu wału korbowego α. Analiza uzyskanych wyników wykazuje silną ich zależność od wartości stopnia sprężania ε silnika dwupaliwowego.
The present paper relates to the problem of the effect of compression ratio of a dual-fuel compression ignition engine fuelled with natural gas (CNG) on selected combustion process parameters. In the course of investigation, there were registered pressure values in the combustion chamber versus crankshaft angle for various compression ratios. The obtained characteristics enabled to determine such combustion process parameters as: maximum pressure Pmax, mean rate of pressure rise (∆p/∆α)śr, maximum rate of pressure rise (dp/dα)max, versus torque M, as well as fuel burnout ratio x versus crankshaft angle α. Analysis of the results indicates strong relationship between the above mentioned parameters and the compression ratio ε of a dual-fuel engine.
Źródło:
Combustion Engines; 2013, 52, 3; 931-935
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ stopnia sprężania na parametry pracy silnika o zapłonie samoczynnym zasilanym dwupaliwowo gazem ziemnym i olejem napędowym
Effect of the compression ratio on operational parameters of a natural gas fuelled compression ignition engine operating in a dual-fuel mode
Autorzy:
Skrzek, T.
Powiązania:
https://bibliotekanauki.pl/articles/133152.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:
stopień sprężania
silnik dwupaliwowy
proces spalania
gaz naturalny
compression ratio
dual-fuel engine
combustion process
natural gas
Opis:
Artykuł dotyczy zagadnienia wpływu stopnia sprężania w dwupaliwowym silniku o zapłonie samoczynnym zasilanym gazem ziemnym i olejem napędowym, na podstawowe parametry jego pracy. W artykule przedstawiano przyjętą koncepcję zmiany stopnia sprężania silnik, oraz zaprezentowano wybrane wyniki w formie charakterystyk: obciążeniowych jednostkowego zużycia energii, sprawności ogólnej, cieplnej, mechanicznej, zawartości składników w spalinach, a także charakterystyki prędkościowej momentu maksymalnego. Analiza wyników badań prowadzi do wniosków że stopień sprężania w dwupaliwowym silniku o ZS wpływa w sposób istotny na opisane parametry pracy dlatego też powinien być starannie dobrany.
The present paper relates to the problem of the effect of compression ratio of a dual-fuel compression ignition engine fuelled with natural gas (CNG) on basic operational parameters of this engine. There is presented an established concept of the engine compression ratio variations and the obtained results are presented in the form of the following load characteristics: specific energy consumption, overal, thermal and mechanical efficiencies, harmful exhaust emissions as well as speed characteristic of the maximum torque. Analysis of the obtained results permits to conclude that the compression ratio in a dual-fuel compression ignition engine influences substantially the above mentioned parameters. Therefore, it should be set precisely.
Źródło:
Combustion Engines; 2013, 52, 3; 924-930
2300-9896
2658-1442
Pojawia się w:
Combustion Engines
Dostawca treści:
Biblioteka Nauki
Artykuł

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