Temat: flow efficiency - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Investigation into the Flow of Gas-Solids during Dry Dust Collectors Exploitation, as Applied in Domestic Energy Facilities – Numerical Analyses
Autorzy:: Maćkowiak, Albert
Kostrzewski, Mariusz
Bugała, Artur
Chamier-Gliszczyński, Norbert
Bugała, Dorota
Jajczyk, Jarosław
Woźniak, Waldemar
Dombek, Grzegorz
Nowak, Karol
Powiązania:: https://bibliotekanauki.pl/articles/28086943.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: the efficiency of dust extraction
energy consumption
multi-phase flow transport
technological transport
computational fluid dynamics
dust collector
Opis:: The paper presents the results related to the simulation of dust-separating tangential cyclones: single cyclones of various geometries, and an axial multi-cyclone with fixed geometries and components. Its goal was to apply low-cost analyses for cyclones in industrial realization. Therefore, the presented research was applied with simulation methodology as a problem of Computational Fluid Dynamics. The models were analyzed using SolidWorks Flow Simulation software. The presented dust collectors are real-life objects, applied in industrial facilities. For a multi-cyclone, the increase in the number of blades, from 5 to 8, together with the change in the angle of a blade’s pitch i.e., 30° and 45°, resulted in dust concentration along the internal walls from just 10% for 5 blades up to c.a. 37.5% for 6 blades, and c.a. 50% for 8 blades, whereas the dust concentration in the device’s central part equals c.a. 20% for the last option. The model validation draws attention to the potential applicability of the software in flow issues alongside common and more complex numerical environments.
Źródło:: Eksploatacja i Niezawodność; 2023, 25, 4; art. no. 174095
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Selected technical aspects of managing efficient heat supply in a district heating system
Autorzy:: Wrzalik, Aleksandra
Powiązania:: https://bibliotekanauki.pl/articles/29521087.pdf
Data publikacji:: 2023
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:: district heating
heat transmission
district heating main
flow velocity
heat losses
pressure losses
efficiency
Opis:: District heating networks are key components of efficient heat supply systems for municipal and industrial consumers. The purpose of the research presented in this article was to analyze the thermo-hydraulic parameters of the operation of a transmission main in a district heating network to improve the heat transfer efficiency. Based on a literature review of existing studies, the basic issues of the heat supply process were discussed, and selected methods and tools for simulating district heating networks were characterized. A detailed mathematical description of the phenomena occurring during heat transport in a district heating network pipeline was also presented. Then, analytical calculations and simulations were carried out for the selected district heating system using Termis software. Operational parameters collected in the actual district heating system were used as output data for analytical modeling. Pressure drops, power losses, and heat transfer efficiencies in the main buses at different outdoor temperatures during the heating season were determined. Selected results of the study were included, and possibilities for improving the efficiency of heat transfer in the studied district heating network were indicated.
Źródło:: Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 76 (148); 32-41
1733-8670
2392-0378
Pojawia się w:: Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Smart control of energy storage system in residential photovoltaic systems for economic and technical efficiency
Autorzy:: Kaczorowska, Dominika
Rezmer, Jacek
Janik, Przemysław
Sikorski, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2202548.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: economic efficiency
energy storage system ESS
microgrid management
optimal power flow
OPF
particle swarm optimisation PSO
Opis:: In recent years, due to the increasing number of renewable energy sources, which are characterised by the stochastic nature of the generated power, interest in energy storage has increased. Commercial installations use simple deterministic methods with low economic efficiency. Hence, there is a need for intelligent algorithms that combine technical and economic aspects. Methods based on computational intelligence (CI) could be a solution. The paper presents an algorithm for optimising power flow in microgrids by using computational intelligence methods. This approach ensures technical and economic efficiency by combining multiple aspects in a single objective function with minimal numerical complexity. It is scalable to any industrial or residential microgrid system. The method uses load and generation forecasts at any time horizon and resolution and the actual specifications of the energy storage systems, ensuring that technological constraints are maintained. The paper presents selected calculation results for a typical residential microgrid supplied with a photovoltaic system. The results of the proposed algorithm are compared with the outcomes provided by a deterministic management system. The computational intelligence method allows the objective function to be adjusted to find the optimal balance of economic and technical effects. Initially, the authors tested the invented algorithm for technical effects, minimising the power exchanged with the distribution system. The application of the algorithm resulted in financial losses, €12.78 for the deterministic algorithm and €8.68 for the algorithm using computational intelligence. Thus, in the next step, a control favouring economic goals was checked using the CI algorithm. The case where charging the storage system from the grid was disabled resulted in a financial benefit of €10.02, whereas when the storage system was allowed to charge from the grid, €437.69. Despite the financial benefits, the application of the algorithm resulted in up to 1560 discharge cycles. Thus, a new unconventional case was considered in which technical and economic objectives were combined, leading to an optimum benefit of €255.17 with 560 discharge cycles per year. Further research of the algorithm will focus on the development of a fitness function coupled to the power system model.
Źródło:: Archives of Electrical Engineering; 2023, 72, 1; 81--102
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Development of last stage blade of 13K215 turbine intermediate pressure module
Autorzy:: Bondyra, Radosław
Przytulski, Jan
Dominiczak, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2091352.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: efficiency
strength calculation
steam turbine
last stage blade
fluid flow
calculation
Opis:: Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20–30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on – in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.
Źródło:: Archives of Thermodynamics; 2022, 43, 1; 45--62
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Experimental testing of the influence of the operating loading on the flow characteristics of hydraulic pump
Autorzy:: Kosiba, Ján
Tkáč, Zdenko
Jablonický, Juraj
Shcherbak, Valeriia
Ganushchak-Yefimenko, Liudmyla
Paumer, Martin
Bukoros, Tetiana
Čurgaliová, Gabriela
Zachar, Martin
Powiązania:: https://bibliotekanauki.pl/articles/2175138.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: hydraulics
hydraulic device
flow efficiency
Opis:: The contribution deals with the influence of the operating loading on the flow characteristics of the hydraulic pump under laboratory conditions. In the test, a new toothed hydraulic pump and hydraulic oil with kinematic viscosity at 40°C, ν = 64.2 mm2.s-1 were used. The operational loading was measured during the most difficult agrotechnical operation – ploughing, at which the loading of the hydraulic pump is the greatest. Laboratory testing was determined for 200 hours, and the flow characteristics had been detected at 50 hours intervals. Measurement of the flow characteristics was performed at rated speed n = 1,000 rpm. Measurement of the flow characteristics was carried out in dependence on the loading pressure from p = 0 MPa to p = 20 MPa. When p = 0 MPa, the value reached n = 91.70% and when p = 20 MPa, n = 86.68%. Running-in of the hydraulic pump lasted 150 hours, with an increase of the flow characteristics Δηvol = 1.36% (p = 10 MPa) compared to the initial state. After working for 200 hours, the flow rate of the hydraulic pump decreases compared to 150 hours.
Źródło:: Eksploatacja i Niezawodność; 2022, 24, 3; 583--589
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Pilot Plant Study on Biological Treatment of Domestic Sewage Using Biopipe System
Autorzy:: Jasem, Hayder Mohammed
Khudair, Kifah Mohammed
Powiązania:: https://bibliotekanauki.pl/articles/2202113.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:: biopipe system
aeration system
removal efficiency
recirculation flow rate
Opis:: The Biopipe system is the first biological wastewater treatment system designed to remove carbonaceous and nitrogenous substances entirely within a pipe. The transformation mechanisms in the Biopipe system can be modelled using a physical model, and several experiments have been carried out to this study. The experimental work was carried out at the Al-Barakia wastewater treatment plant (BWWTP) in Iraq’s Najaf governorate that will be done to obtain continuous source of sanitary sewage flow and thus, maintain the pilot plant operation. Two tanks, two pumps, a Flow Control and Measuring Device, PVC Pipes, and an Aeration System make up the physical model. Seeding using activated sludge from a similar plant, The Biopipe system requires 28 days to get steady results and maximal COD, TN and TSS removal efficiency. The tests were carried out on a Biopipe system with recirculation with different value of influent flow rate and different recirculation ratio. The most important findings of the Biopipe system application indicated that system is better for removing COD than TN. When the recirculation ratio was equal to 9, the removal efficiency of chemical oxygen demand (COD) and total nitrogen (TN) achieved 66.50% respectively. The dissolved oxygen concentration rises to 5.75 mg/l when the recirculation flow rate is increased to 216 m3/day. In addition, it was found that the removal efficiency of biodegradable organics can be enhanced in case of low influent flow rate and high recirculation flow rate.
Źródło:: Journal of Ecological Engineering; 2022, 23, 10; 139--146
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The study on the influence of the injected flow swirling on the characteristics of the jet pump
Autorzy:: Panevnyk, D. O.
Powiązania:: https://bibliotekanauki.pl/articles/2201039.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: jet pump
ejection
ejection system
twisting flow
efficiency
pompa strumieniowa
wyrzut
przepływ skrętny
efektywność
Opis:: Purpose: of this paper is to analyze the possibility of increasing the efficiency of wellbore jet pumps by twisting the injected flow. The absence of moving parts, easy transfer of energy, the ability to operate a wide range of performance and low cost have resulted in the use of ejection systems in many oil and gas deposits. The main disadvantage of borehole ejection systems is the insufficient value of the jet pump efficiency. The energy efficiency of downhole jet pumps can be improved by swirling the mixed flows. Design/methodology/approach: To characterize the effect of circulating flows was used an additional factor in the form of the values of the inclination angle of guiding elements that swirl the flow or the rotation frequency of jet pump elements. In the process of determining the values characterizing the operating process of ejection systems, the flow rates of the working and injected flow and the pressure values in front of the nozzle, the receiving chamber and the chamber at the outlet from the diffuser of the jet pump are subject to direct measurement. Swirling of the injected flow was carried out by placing a sleeve with guiding elements, manufactured using 3D printing technology, in the receiving chamber of the jet pump. Findings: The analysis revealed that in the design of downhole jet units, there are used guiding elements, mainly the screw, blade and tangential type, to swirl the flow. A highlighted list of factors that have a direct effect on the flows mixing process. During experimental studies of swirling injected flow type jet pump characteristics, there is obtained an increase in pressure and energy parameters. Research limitations/implications: The task of further research is to determine the characteristics of a downhole swirling injected flow type jet pump for conditions of combined swirling of the working and injected flows. Practical implications: The obtained results make it possible to take into account the presence of guiding elements in the flow path of the jet pump for swirling the flow. Originality/value: It is established that the relationship between the design and technological parameters of the local swirling of the mixed medium is determined by the ratio of rotating and axial components of the flow velocity in the flow path of the jet pump.
Źródło:: Journal of Achievements in Materials and Manufacturing Engineering; 2022, 113, 1; 22--30
1734-8412
Pojawia się w:: Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Analysis of the polymeric abrasive paste regeneration for abrasive flow machining
Analiza regeneracji polimerowych past ściernych do obróbki przetłoczono-ściernej
Autorzy:: Nowacka, Agnieszka
Klepka, Tomasz
Powiązania:: https://bibliotekanauki.pl/articles/2088255.pdf
Data publikacji:: 2021
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:: polimerowe pasty ścierne
obróbka przetłoczno-ścierna
wydajność przesiewania
obróbka powierzchni polimerowych
polymeric abrasive paste
abrasive flow machining
efficiency of sifting
processing of polymer surfaces
Opis:: The influence of conditions and the sifting process efficiency of the worn-out polymeric abrasive paste containing silica (SiO2) and polymer chips remaining after the surface treatment were investigated. The abrasive paste regeneration process consisted of sifting the used paste through sieves of a vibrating screen, on which abrasive grains and polymer chips were recovered. The diameter of the sieve holes determined the size of the recovered abrasive grains and polymer chips, on the size of which the efficiency of the process depended. The lowest efficiency of the sifting process was obtained using a sieve with the holes diameter equal to the diameter of the grain and the polymer chips of the given fraction. The highest efficiency of the sifting process was obtained for a sieve with a diameter of 0.032 mm. The regenerated polymeric abrasive paste can be reused in the process of abrasive flow machining.
Z badano w pływ w arunków i wydajność procesu przesiewania zużytej polimerowej pasty ściernej zawierającej krzemionkę (SiO2) i pozostałe po obróbce powierzchni wióry polimerowe. Proces regeneracji pasty ściernej polegał na przesianiu zużytej pasty przez sita przesiewacza wibracyjnego, na których odzyskiwano ziarna ścierne i wióry polimerowe. Średnica otworów sita determinowała wielkość odzyskanych ziaren ściernych i wiórów polimerowych, od których wielkości zależała wydajność procesu. Najmniejszą wydajność procesu przesiewania uzyskano stosując sito o średnicy otworów równej średnicy ziarna oraz wiórów polimerowych danej frakcji, a największą sito o średnicy 0,032 mm. Zregenerowaną polimerową pastę ścierną można ponownie wykorzystać w procesie obróbki przetłoczono–ściernej.
Źródło:: Polimery; 2021, 66, 7-8; 423--428
0032-2725
Pojawia się w:: Polimery
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Enhancement of Aerodynamic Efficiency of Aerofoil Using Improved Blowing and Suction System
Autorzy:: Balaji, K.
Wessley, G. Jims John
Powiązania:: https://bibliotekanauki.pl/articles/2024000.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: Co flow jet
Improved blowing and suction system
aerodynamic efficiency
stalling angle
control surfaces
secondary flow
Opis:: Improved Blowing and Suction System (IBSS) is a novel concept that can be effectively implemented in future aircraft to improve the aerodynamic performance of aircraft wings. The proposed IBSS consists of a regular wing without its secondary control surfaces and with a Pump. The injection and suction system is used to create additional flow without disturbing the main flow over the aerofoil which effectively delays the boundary layer separation. The injection and suction areas are kept constant and they are located just below the maximum thickness point and suction is created close to the trailing edge. This paper presents a detailed numerical analysis of the proposed IBSS and the study shows that the stalling angle of attack is increased by 60% while the coefficient of lift is increased 37.5% compared to the baseline aerofoil. Also, the commercially used coflow jet (CFJ) method stalls at a 12° angle of attack whereas with the proposed IBSS method the stall occurs at a 16° angle of attack. The stalling angle is thus delayed by 33%, thus increasing the aerodynamic performance of the wing as compared to the existing methods. Also, any malfunction in IBSS does not significantly affect the performance of the aircraft. The implementation of IBSS will lead to a reduction in the weight of the aircraft and the elimination of secondary control surfaces.
Źródło:: Advances in Science and Technology. Research Journal; 2021, 15, 2; 116-126
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Removal of cyclohexane and ethanol from air in biotrickling filters inoculated with Candida albicans and Candida subhashii
Usuwanie z powietrza cykloheksanu i etanolu w biofiltrach strużkowych zasiedlonych grzybami Candida albicans i Candida subhashii
Autorzy:: Rybarczyk, Piotr
Marycz, Milena
Szulczyński, Bartosz
Brillowska-Dąbrowska, Anna
Rybarczyk, Agnieszka
Gębicki, Jacek
Powiązania:: https://bibliotekanauki.pl/articles/1845437.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: biofilm
flow cytometry
removal efficiency
ethanol
biofiltration
cyclohexane
cytometria przepływowa
skuteczność usuwania
etanol
biofiltracja
cykloheksan
Opis:: This paper presents investigations on the removal of cyclohexane and ethanol from air in polyurethane- -packed biotrickling filters, inoculated with Candida albicans and Candida subhashii fungal species. Results on process performance together with flow cytometry analyses of the biofilm formed over packing elements are presented and discussed. The results indicate that the presence of ethanol enhances the removal efficiency of cyclohexane from air. This synergistic effect may be attributed to both co-metabolism of cyclohexane with ethanol as well as increased sorption efficiency of cyclohexane to mineral salt medium in the presence of ethanol. Maximum elimination capacities of 89 g m-3 h-1 and 36.7 g m-3 h-1 were noted for cyclohexane and ethanol, respectively, when a mixture of these compounds was treated in a biofilter inoculated with C. subhashii. Results of flow cytometry analyses after 100 days of biofiltration revealed that about 91% and 88% of cells in biofilm remained actively dividing, respectively for C. albicans and C. subhashii species, indicating their good condition and ability to utilize cyclohexane and ethanol as a carbon source.
W pracy przedstawiono badania nad usuwaniem cykloheksanu i etanolu z powietrza w boifiltrach zraszanych, wypełnionych pianką poliuretanową, zasiedloną grzybami z gatunku Candida albicans i Candida subhashii. Przedstawiono i omówiono wyniki dotyczące wydajności procesu (na podstawie pomiarów techniką chromatografii gazowej) wraz z wynikami cytometrii przepływowej dla utworzonego biofilmu. Uzyskano wartości zdolności usuwania, wynoszące około 89 g m-3 h-1 i 36.7 g m-3 h-1, odpowiednio dla cykloheksanu i etanolu, gdy te związki jednocześnie poddawano procesowi biofiltracji w biofiltrze zaszczepionym Candida subhashii. Wyniki wskazują, że obecność etanolu powoduje zwiększenie skuteczności usuwania cykloheksanu z powietrza. Wzrost skuteczności usuwania z powietrza cykloheksanu w obecności etanolu może wynikać z polepszonego metabolizmu cykloheksanu w takich warunkach oraz z ograniczenia bariery dla przenikania masy, wskutek lepszych właściwości sorpcyjnych cieczy zraszającej wobec cykloheksanu w obecności etanolu.
Źródło:: Archives of Environmental Protection; 2021, 47, 1; 26-34
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Simulation of a downhole jet-vortex pump’s working process
Symulacja procesu pracy wgłębnych wirowych pomp strumieniowych
Autorzy:: Panevnyk, Denis
Powiązania:: https://bibliotekanauki.pl/articles/2143563.pdf
Data publikacji:: 2021
Wydawca:: Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:: downhole ejection system
oil
jet pump
relative
pressure
injection
ratio
flow
twist
efficiency
wgłębny system wydobywczy
pompa strumieniowa
wydobycie ropy naftowej
ciśnienie względne
współczynnik
tłoczenie
przepływ skrętny
wydajność
Opis:: The article is devoted to the theoretical study of the operation process of the borehole ejection system as part of the tubing string, jet pump and packer installed below; the system implements the hydrojet method of oil well operation. The improved design of the jet pump contains inclined guiding elements placed in its receiving chamber for swirling the injected flow, which results in an increase in the efficiency of the borehole ejection system. Based on the law of conservation of liquid momentum in the mixing chamber of the jet pump and taking into account the inertial pressure component caused by the swirling of the injected flow, there is obtained the relative form of the equation of the ejection system pressure characteristic, the structure of which contains a component that determines the value of the additional dynamic head. According to the results obtained, the additional dynamic head caused by swirling of the injected flow is determined by the ratio of the geometric dimensions of the flow path of the jet pump, the angle of inclination of the elements for creating vortex flows, and the ratio of the power and reservoir fluids. In the case of asymmetric swirling of the injected flow, an increase in the value of the relative displacement of the jet pump decreases the value of the additional dynamic pressure. In order to study the effect of flow swirling on the energy characteristic of the ejection system, the pressure characteristic of the jet pump was transformed into the dependence of its efficiency on the injection coefficient. Jet pump models with the ratio of the cross-sectional areas of the mixing chamber and the nozzle of 5.012 and 6.464, respectively, were used to check the adequacy of the theoretical pressure and energy characteristics obtained during the simulation of the performance process of the concentric ejection system. The average error in the theoretical determination of the pressure and efficiency of the vortex jet does not exceed 8.65% and 6.48%, respectively.
Artykuł poświęcony jest teoretycznemu studium opisującemu proces pracy wgłębnego systemu wydobycia z odwiertu złożonego z kolumny rur wydobywczych, pompy strumieniowej i zainstalowanego poniżej pakera; przy użyciu tego systemu prowadzona jest eksploatacja odwiertów naftowych metodą hydrojet. Udoskonalona konstrukcja pompy strumieniowej zawiera skośne elementy prowadzące umieszczone w jej komorze zasilającej do zawirowania przepływu tłoczonego płynu, co skutkuje zwiększeniem wydajności systemu wydobycia z odwiertu. Na podstawie zasady zachowania pędu cieczy w komorze mieszania pompy strumieniowej oraz po uwzględnieniu bezwładnościowej składowej ciśnienia wywołanej zawirowaniem przepływu tłoczonego płynu otrzymuje się względną postać równania charakteryzującego ciśnienia w układzie ejekcyjnym, którego struktura zawiera składnik określający wartość dodatkowej wysokości podnoszenia. Zgodnie z uzyskanymi wynikami dodatkowa wysokość podnoszenia spowodowana zawirowaniem przepływu tłoczonego płynu jest określona przez: stosunek wymiarów geometrycznych toru przepływu pompy strumieniowej, kąt nachylenia elementów tworzących przepływ wirowy oraz stosunek płynów zasilających i złożowych. W przypadku asymetrycznego zawirowania przepływu tłoczonego płynu wzrost wartości względnej wyporności pompy strumieniowej powoduje zmniejszenie wartości dodatkowego ciśnienia dynamicznego. W celu zbadania wpływu zawirowania przepływu na charakterystykę energetyczną układu ejekcyjnego – charakterystykę ciśnieniową pompy strumieniowej przekształcono na zależność jej sprawności od współczynnika tłoczenia. Do sprawdzenia prawidłowości teoretycznych charakterystyk ciśnienia i energii uzyskanych podczas symulacji procesu pracy koncentrycznego układu ejekcyjnego wykorzystano modele pomp strumieniowych o stosunku powierzchni przekroju komory mieszania do dyszy odpowiednio 5,012 i 6,464. Średni błąd ciśnienia i wydajności strumienia wirowego wyznaczonych w sposób teoretyczny nie przekraczał odpowiednio 8,65% i 6,48%.
Źródło:: Nafta-Gaz; 2021, 77, 9; 579-586
0867-8871
Pojawia się w:: Nafta-Gaz
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Optimization the operation parameters of SDA desulfurization tower by flow coupling chemical reaction model
Autorzy:: Mei, Dan
Shi, Junjie
Zhu, Yuzheng
Xu, Xuemei
Xing, Futang
Shi, Ling
Powiązania:: https://bibliotekanauki.pl/articles/778336.pdf
Data publikacji:: 2020
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: spray drying absorber tower
gas-liquid two-phase flow
droplet diameter
desulfurization efficiency
amount of scaling
Opis:: Spray Drying Absorber (SDA) has been widely used for large-scale desulfurization. However, it also has some limitations. For example, the liquid absorbent easily causes scaling, which impedes the contact between the serous fluid and the flue gas and reduces the chemical reaction rate and desulfurization efficiency. This paper establishes the mathematical and physical model of gas and liquid two-phase flow and droplet evaporation and heat transfer in rotary spray desulfurization tower. To study the accumulation and distribution of chemical reaction precipitates in the desulfurization tower and analyze the removal efficiency of sulfur dioxide (SO²) in different atomization diameters, this paper establishes a simulation model concerning the coupling of desulfurization reaction and flow field calculation based on the absorption and reaction mechanism of SO². Baffle in different widths are set to optimize the internal floweld and balance the distribution of flue gas. By setting baffles of different widths to optimize the flow feld in the tower and changing the distribution of flue gas, this model reduces the scaling while ensuring the desulfurization efficiency. The results of the simulation experiment have verified that the droplet with a diameter of 50 μm is the optimal option, which can effectively remove the scaling and ensure that the desulfurizing tower runs in high efficiency and stability. When the width of baffes is 2250 mm, the efficiency of desulfurization exceeds 95%, and the amount of scaling on the desulfurization tower main wall is controlled at the minimum level, which is the optimal option for production.
Źródło:: Polish Journal of Chemical Technology; 2020, 22, 1; 35-45
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: The efficiency of food supply chain engineering (case study in Ukraine)
Autorzy:: Kush, Yevhen
Tonkoshkur, Maksym
Vakulenko, Kateryna
Ryabev, Anton
Davidich, Natalia
Galkin, Andrii
Powiązania:: https://bibliotekanauki.pl/articles/1833669.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: material flow
direct channel
supply chain
food supply engineering
present value
efficiency
przepływ materiałów
kanał bezpośredni
łańcuch dostaw
inżynieria dostaw żywności
wartość
wydajność
Opis:: The basic conceptual idea of logistics is the need to adapt the company to an ever-changing market situation, while spending a minimum of funds in these conditions. The concept of logistics is a system of views on the rationalization of economic activity by optimizing material flows. The paper investigates the change of the main indicators of the functioning of the supply chain, depending on the organization of distribution of the material flow. The supply systems of food products that form the consumer basket at the stage of distribution is considered. The conceptual schemes of freight flow distribution with and without distribution center is presented. The field research was conducted to determine and initial data were collected. The paper investigate the functioning of the supply chain in two cases: in a situation "proposed scenario" and in a situation "without a project". The situation "existing scenario" implies that no action to change the parameters of the supply chain during the period specified for the research does not take place. In this case, it is necessary to assess the effectiveness of the logistics chain under existing conditions. An integrated approach to evaluate the efficiency of the functioning of the logistics system and the consumer had been used. The efficiency of existing of the supply chain functioning were analysed. Also, certain measures will be implemented to improve the chain through investments and by bringing logistics infrastructure with the needs. A modelling of the supply chain was made. The effect of parameters of participants on the supply chain efficiency was analysed. The planned effect from the reorganization of distribution channels is calculated. The technological and economic feasibility of introducing a distribution center into the existing distribution channel based on modeling is calculated. The object of the research is the process of food products distribution in the supply chain. The aim of the research is to evaluate the effectiveness of the food supply chain scheme.
Źródło:: Archives of Transport; 2020, 55, 3; 51-71
0866-9546
2300-8830
Pojawia się w:: Archives of Transport
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Zintegrowana identyfikacja i monitorowanie przesyłek e-commerce w łańcuchu dostaw Nowego Jedwabnego Szlaku
Integrated identification and monitoring of e-commerce parcels in the New Silk Road supply chain
Autorzy:: Śliwczyński, Bogusław
Koliński, Adam
Powiązania:: https://bibliotekanauki.pl/articles/1385652.pdf
Data publikacji:: 2020-09-30
Wydawca:: Polskie Wydawnictwo Ekonomiczne
Tematy:: Nowy Jedwabny Szlak
e-commerce
identyfikacja towarów
sprawność procesu
integracja przepływu informacji
łańcuch dostaw
New Silk Road
identification of goods
process efficiency
integration of information flow
supply chain
Opis:: Na podstawie przeglądu literatury naukowej, jak również szczegółowej analizy procesów gospodarczych, należy stwierdzić, że wzrost wolumenu sprzedaży na rynku e-commerce w skali globalnej generuje nie tylko potrzebę analizy rozwoju biznesu, ale przede wszystkim konieczność prowadzenia badań naukowych w zakresie usprawniania procesów logistycznych i przepływu informacji w łańcuchu dostaw. Relatywnie długi czas dostawy zamówionego towaru, złożoność procesów celnych oraz obsługi logistycznej powodują konieczność ścisłego monitorowania statusu realizowanych operacji na wielu etapach dostaw. Dodatkowym problemem uniemożliwiającym kompleksową integrację łańcucha dostaw towarów e-commerce są różne standardy informacyjne i fizycznej identyfikacji, stosowane w obsłudze przesyłek transgranicznych. Celem niniejszego artykułu jest weryfikacja dostępnych możliwości monitorowania i identyfikacji towarów w przesyłkach e-commerce oraz szukanie możliwości usprawnień procesowych.
Both in the scientific literature and in the observation of business practice, it should be stated that the increase in the share of the e-commerce market on a global scale generates not only business needs, but above all the need to conduct scientific research on improving logistics processes and supply chain information flow. The relatively long delivery time of the ordered goods, the complexity of customs and tax processes make it necessary to closely monitor the status of the realized transport. An additional problem preventing a comprehensive integration of the e-commerce goods supply chain is the different standards required in cross-border shipments in terms of customs or tax. The main aim of this article is to verify the available possibilities of monitoring and identification of goods in e-commerce shipments and the to look for possibilities of process improvements.
Źródło:: Gospodarka Materiałowa i Logistyka; 2020, 9; 13-26
1231-2037
Pojawia się w:: Gospodarka Materiałowa i Logistyka
Dostawca treści:: Biblioteka Nauki

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