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Wyświetlanie 1-14 z 14
Tytuł:
Wykorzystanie ciepła ze spalin wylotowych z kotła w bloku energetycznym klasy 900 MW
The use of heat recovered from boiler flue gases in a 900 MW class power plant
Autorzy:
Wołowicz, M.
Milewski, J.
Bujalski, W.
Lewandowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/173055.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
spaliny
blok energetyczny
ciepło ze spalin
exhaust
power unit
heat from exhaust
Opis:
W artykule przedstawiona została koncepcja wykorzystania ciepła ze spalin wylotowych z kotła do podgrzewu wody zasilającej i powietrza dla nadkrytycznego bloku węglowego. W celu przeprowadzenia analizy zbudowany został model bloku pracującego w zmienionych warunkach (off design) oraz wygenerowane zostały jego charakterystyki. Przedstawiono informacje na temat zaproponowanej koncepcji umieszczenia dodatkowego wymiennika w schemacie cieplnoprzepływowym rozpatrywanego bloku. Omówiona została również koncepcja wykorzystania ciepła ze spalin do podgrzewu powietrza wlotowego do kotła i na podstawie obliczeń zaproponowane zostały parametry takiego układu.
The paper presents the concept of using heat recovered from flue gases to heat up feedwater and inlet air in supercritical coal-fired unit. This concept has been developed for the reference condensing unit of 900 MW – class. In order to enable the analyse the model of such unit was build and its characteristics were generated using the off design mode. The concept of an additional heat exchanger and its place in the unit scheme was provided. Also the concept of using heat recovered from flue gases to heat up the intake air to the boiler was discussed. Based on calculations the parameters of such system were proposed.
Źródło:
Archiwum Energetyki; 2013, 43, 1/2; 101-108
0066-684X
Pojawia się w:
Archiwum Energetyki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Walcowanie i nagniatanie gwintów wewnętrznych. Część 1, Konstrukcja narzędzi
Rolling and burnishing of internal threads. Part 1, The design of tools
Autorzy:
Okoński, S.
Moszumański, R.
Wołowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/211950.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej
Tematy:
walcowanie
nagniatanie
gwinty wewnętrzne
głowice rolkowe
rolling
burnishing
internal threads
rolling heads
Opis:
Walcowanie i nagniatanie gwintów wewnętrznych za pomocą głowic rolkowych zapewnia bardzo wysoką jakość wyrobów. Zastosowanie tych technologii jest jednak ograniczone do wykonywania gwintów drobnozwojowych o stosunkowo dużych średnicach nominalnych (powyżej 50 mm) w stalach niskowęglowych oraz stopach miedzi i aluminium, gdyż istotną trudność stanowi skonstruowanie i wykonanie wystarczająco sztywnych i wytrzymałych narzędzi. Opisane w artykule własne rozwiązania konstrukcyjne głowic rolkowych umożliwiają kształtowanie plastyczne gwintów wewnętrznych, począwszy od średnicy nominalnej 24 mm. Są one przedmiotem ochrony patentowej. Dzięki zastosowaniu wymiennych elementów możliwe jest walcowanie jednym narzędziem gwintów wewnętrznych o zbliżonych średnicach nominalnych i różnych skokach oraz zarysach.
Rolling of internal threads with the use of rolling heads gives products of very high quality. Yet, the use of this technology is limited to made fine-pitch threads with relatively large nominal diameters (larger than 50 mm) in low carbon steels and copper and aluminum alloys, because the main reason is the difficulty in designing and making sufficiently rigid and durable tools. Our design solutions of the rolling heads described in the article enable plastic forming of internal threads starting from the nominal diameter of 24 mm and are protected by patents. Owing to the use of replaceable parts it is possible to roll with one tool the internal threads of similar nominal diameters but different pitches and profiles.
Źródło:
Obróbka Plastyczna Metali; 2013, 24, 4; 279-288
0867-2628
Pojawia się w:
Obróbka Plastyczna Metali
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Toxic Heavy Metal Ions and Metal-Complex Dyes Removal from Aqueous Solutions Using an Ion Exchanger and Titanium Dioxide
Usuwanie toksycznych jonów metali ciężkich oraz metalobarwników z roztworów wodnych z wykorzystaniem jonitu oraz tlenku mineralnego
Autorzy:
Wołowicz, A.
Wawrzkiewicz, M.
Hubicki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/234379.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
dyes
heavy metals
removal
ion exchangers
titanium dioxide
barwniki
metale ciężkie
usuwanie
wymieniacze jonowe
dwutlenek tytanu
Opis:
The aim of the study was to compare the removal efficiency of toxic heavy metal ions: chromium(VI), nickel(II) and copper(II) as well as metal-complex dyes from aqueous solution using Lewatite VPOC 1065 and AdsorbsiaTM As500. The point of zero charge (pHPZC) of both sorbents and the influence of the initial concentration on the sorption process of Ni(II), Cu(II), Cr(VI), C.I. Acid Red 183 (AR183), C.I. Reactive Blue 21 (RB21) and nickel(II) phthalocyanine-tetrasulfonic acid tetrasodium salt (NiPc-TSATSS) were studied to determine the maximum sorption capacity. Kinetic studies were also carried out for the most effective sorbent-sorbate systems. The concentration effect of both hydrochloric acid and auxiliaries on the removal yield was also taken into account. As was found, Lewatit VPOC 1065 can be successfully applied for the treatment of textile wastewaters containing metal complex dyes and heavy metal ions. The highest sorption capacity, qe = 816.1 mg/g, was found for C.I. Acid Red 183.
Wśród zanieczyszczeń środowiska na szczególną uwagę zasługują metale ciężkie oraz metalobarwniki, które emitowane są do środowiska z różnych gałęzi przemysłu. Z uwagi na ich negatywny wpływ na organizmy żywe niezwykle istotnym jest ich usuwanie z wód i ścieków z wykorzystaniem różnych metod, wśród których adsorpcja odgrywa istotną rolę. Celem pracy było porównanie efektywności usuwania toksycznych jonów metali ciężkich: Cr(VI), Ni(II), Cu(II) oraz metalobarwników :C.I. Acid Red 183, C.I. Reactive Blue 21, soli tetrasodowej kompleksu nikluikwasu ftalocyjanino-tetrasulfonowego z roztworów wodnych z wykorzystaniem jonitu Lewatit VPOC 1065 oraz tlenku AdsorbsiaTM As500. Wyznaczono pHPZC obu sorbentów oraz zbadano wpływ stężenia początkowego na proces sorpcji badanych sorbatów oraz kinetykę procesu sorpcji dla najbardziej efektywnego układu sorbent-sorbat. W badaniach uwzględniono także wpływ stężenia kwasu chlorowodorowego oraz wpływ substancji pomocniczych na proces sorpcji.
Źródło:
Fibres & Textiles in Eastern Europe; 2018, 2 (128); 108-114
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of parallel hot windbox repowering on 387 MW fossil fuel power plant
Autorzy:
Harutyunyan, A.
Badyda, K.
Wołowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/175190.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
combined cycle power plant
fossil boiler
hot windbox repowering
CO2 emissions
Opis:
The paper presents the concept of repowering in existing power plant. Among technologies for existing steam power plants, the hot windbox repowering is the fastest way to respond to the energy demand, improve efficiency and reduce the pollutants emissions. Thermodynamic analysis of power plant model with fossil boiler before and after hot windbox repowering, has been investigated using commercial software. The purpose of this work is to understand and analyze the effect of hot windbox repowering on 387 MW fossil fuel power plant as well as the effect of additional heat exchangers, which have been installed parallel with regeneration system to use the heat of boiler exhaust gases. In this way, after repowering the summary power of power plant in base load is 615 MW, which has been reached adding gas turbine (176.9 MW). To analyze the model, calculations were performed in 3 stages: 1) calculation and comparison of the thermodynamic parameters as well as carbon dioxide emissions of power plant model before and after repowering, 2) analysis of the optimal value of feed water mass flow through heat exchangers installed after economizer, 3) calculation of thermodynamic parameters in values 100%, 90%, 80% and 75% of fossil boiler heat loads.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 79-95
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sunset Yellow sorption on weak base anion exchanger — kinetic and equilibrium studies
Autorzy:
Wawrzkiewicz, M.
Wołowicz, A.
Greluk, M.
Hubicki, Z.
Powiązania:
https://bibliotekanauki.pl/articles/115804.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
dye
anion exchanger
adsorption
kinetics
Opis:
The sorption equilibrium and kinetics of Sunset Yellow dye in aqueous solutions on the weak base anion exchange resin — Amberlite FPA51 were examined in this paper. The influences of phase contact time, solution pH, initial dye concentration and temperature were studied by the batch method. The amounts of dye sorbed at equilibrium changed from 9.9 to 48.7 mg/g with the increasing initial concentrations in the range 100–500 mg/L. The experimental data were analyzed by the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models of adsorption. The maximum monolayer capacity was 130.6 mg/g. The sorption free energy was equal to 14.6 kJ/mol and revealed the nature of the ion exchange mechanism in this system. The kinetic data were modelled using the pseudo-first order, pseudo-second order and intraparticle diffusion equations.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 66-70
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption of the acid dyes onto strongly basic anion exchanger: Kinetic and equilibrium studies
Autorzy:
Greluk, M.
Hubicki, Z.
Wołowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/115757.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
adsorption isotherms
adsorption kinetics
acid dyes
resin
Opis:
The strong base acrylic anion exchangers, Amberlite IRA-458, was used as an adsorbent for the investigation of acid dyes (Acid Orange 7, Acid Orange 10 and Acid Red 88) adsorption kinetics and isotherms. The pseudo-fi rst order and pseudo-second order kinetic models were used to analyze the kinetic data and good agreement between the experimental and calculated amounts of dye adsorbed at equilibrium were obtained for the pseudo-second order kinetic models for the entire investigated concentrations domain in the case all three investigated dyes. The adsorption equilibrium data were analyzed by the Langmuir and Freundlich isotherm models with the best fitting being the first one.
Źródło:
Challenges of Modern Technology; 2011, 2, 1; 74-78
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent trends in the prevalence of neoplasia in the Baltic clam Macoma balthica (L.) from the Gulf of Gdańsk (Baltic Sea)
Autorzy:
Smolarz, K.
Thiriot-Quievreux, C.
Wolowicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/48670.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
Baltic clam
neoplasia
Macoma balthica
Baltic Sea
Gdansk Gulf
pollutant
cancer
Opis:
This study discusses the occurrence of neoplasia in the Baltic clam Macoma balthica from the Gulf of Gdańsk in recent years and investigates potential relationships between toxic compounds in the environment and the presence of the cancer. The disease was identified at four sampling stations during 1999–2002. Comparison with previous results highlighted the substantial prevalence of the tumour between 1998 and 2002. The prevalence of the cancer was strongly dependent on the sampling location (p < 0.001): it was highest at sampling point H45 (the deepest part of the gulf) and lowest at station PB30 (central part of the gulf). Monthly studies showed a trend towards an increasing prevalence of neoplasia during the warm months. However, over several sampling months no strong statistical correlation between the prevalence of the disease and the sampling time was found. The results of the study suggest that several environmental factors may promote the progress of the cancer in M. balthica from the Gulf of Gdańsk: it is most probably an indirect effect of pollution, although causality cannot be proven at this stage. Seriously polluted and exhibiting a considerable asymmetry of contamination, the ecosystem of the gulf provides an ideal environment for testing potential cause-effect relationships between pollutants and their biological effects.
Źródło:
Oceanologia; 2005, 47, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Equilibrium and kinetic studies of palladium(II) ions sorption onto Dowex resins
Autorzy:
Wołowicz, A.
Hubicki, Z.
Greluk, M.
Powiązania:
https://bibliotekanauki.pl/articles/115919.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
palladium
sorption
pseudo-first order kinetic equation
pseudo-second order kinetic equation
isotherms
Opis:
Palladium(II) sorption was studied in hydrochloric acid solutions with sodium chloride addition onto Dowex MSA-1 and Dowex MSA-2 resins by means of the static method. The dependence between the amount of palladium(II) ions sorbed at time tin a disequilibrium state (qt) as well as the sorption capacities (qe) and phases contact time were obtained. The results were applied in kinetic studies using the pseudo-fi rst (Lagergren equation) and pseudo-second order kinetic equations (linear form of Blanchard equation proposed by Ho, PSO). Moreover, the equilibrium studies were caried out at ambient temperature and fitted to the Langmuir and Freundlich isotherms. The AFM pictures of the surface of anion exchange resins before and after the loading process were also recorded. Both resins exhibit high selectivity towards palladium(II) ions. The sorption capacities are in the range 7–10 mg/g for both resins under discussion in all examined solutions. Th e pseudo-second order kinetic equation and the Langmuir isotherm show the best fit with the experimental data.
Źródło:
Challenges of Modern Technology; 2011, 2, 2; 71-75
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Varion resins selectivity towards palladium(II) ions in hydrochloric acid solutions with sodium chloride addition
Autorzy:
Wołowicz, A.
Hubicki, Z.
Greluk, M.
Wawrzkiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/115425.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
palladium(II)
sorption
Varion resin
strongly and weakly basic anion exchange resins
Opis:
Ion exchange is Ion exchange is found more and more signifi cant importance in metal processing, and hydrometallurgy in general, not only for the removal of impurities but also for the reconcentration process of metal ions. The ion exchange method (dynamic method) was applied in the preconcentration of palladium(II) ions from the chloride solutions with sodium chloride addition. Varion resins such as the strongly basic anion exchange resins: Varion ADM and Varion ATM and the weakly basic anion exchange resin Varion ADAM were taken into account during the sorption process. The selectivity series were obtained based on the breakthrough curves of palladium(II) ions determined by means of dynamic method. Moreover, the distribution coefficients: weight and bed as well as the working anion exchange capacities were calculated. From the Varion resins — Varion ADAM is the most promising in the preconcentration of Pd(II).
Źródło:
Challenges of Modern Technology; 2011, 2, 3; 34-37
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of PCBs and PAHs levels in European coastal waters using mussels from the Mytilus edulis complex as biomonitors
Autorzy:
Olenycz, M.
Sokolowski, A.
Niewinska, A.
Wolowicz, M.
Namiesnik, J.
Hummel, H.
Jansen, J.
Powiązania:
https://bibliotekanauki.pl/articles/48472.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
polychlorinated biphenyl
polycyclic aromatic hydrocarbon
organic pollutant
biomonitoring
mussel
Mytilus edulis
coastal water
pollution
Źródło:
Oceanologia; 2015, 57, 2
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative studies on the morphometry and physiology of European populations of the lagoon specialist Cerastoderma glaucum (Bivalvia)
Autorzy:
Tarnowska, K.
Wolowicz, M.
Chenuil, A.
Feral, J.-P.
Powiązania:
https://bibliotekanauki.pl/articles/48074.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
ecophysiology
Baltic Sea
morphometry
bivalve
lagoon
European population
Cerastoderma glaucum
physiological parameter
seasonal change
adaptation
Mediterranean Sea
cockle
North Sea
Bivalvia
Opis:
Seasonal changes in the morphometric and physiological parameters of the cockle Cerastoderma glaucum (Bivalvia) from the Baltic Sea (GD), the North Sea (LV), and the Mediterranean Sea (BL) were investigated. The cockles from GD were much smaller than those from other populations due to osmotic stress. The female to male ratios did not differ significantly from 1 : 1. The northern populations (GD, LV) had a monocyclic reproductive pattern, whereas the southern population (BL) seemed to reproduce throughout the year. Seasonal changes in the contents of biochemical components appeared to be correlated with changes in trophic conditions and the reproductive cycle. Protein content was the highest in spring for all the populations. The highest lipid contents and lowest carbohydrate contents were noted in GD and BL in spring, while no marked differences were noted among seasons in LV (probably because the data from both sexes were pooled). Respiration rates in GD were the highest among the populations, which could have been due to osmotic stress. High metabolic rates expressed by high respiration rates in GD and LV in spring and autumn could have resulted from gamete development (in spring) and phytoplankton blooms (in spring and autumn).
Źródło:
Oceanologia; 2009, 51, 3; 437-458
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Basic for a valuation of the Polish Exclusive Economic Zone of the Baltic Sea: Rationale and quest for tools
Autorzy:
Weslawski, J.M.
Andrulewicz, E.
Kotwicki, L.
Kuzebski, E.
Lewandowski, A.
Linkowski, T.
Massel, S.R.
Musielak, S.
Olanczuk-Neyman, K.
Pempkowiak, J.
Piekarek-Jankowska, H.
Radziejewska, T.
Rozynski, G.
Sagan, I.
Skora, K.E.
Szefler, K.
Urbanski, J.
Witek, Z.
Wolowicz, M.
Zachowicz, J.
Zarzycki, T.
Powiązania:
https://bibliotekanauki.pl/articles/47570.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
marine environment
erosion
mineral resource
biofiltration
Polish Exclusive Economic Zone
economic valuation
Baltic Sea
ecosystem
marine ecosystem
coastal sand
fish resource
Opis:
This paper summarises current knowledge of goods and services in the Polish Exclusive Economic Zone of the Baltic Sea ecosystem. It reviews specific properties of the Baltic that could be used for economic valuation. Goods and services range from the familiar resources of fish and minerals, which were valued with the Productivity Method, to less obvious services provided by the ecosystem such as biofiltration in coastal sands, valued with either the Replacement Cost or Damage Cost Avoided methods. Disservices to the marine ecosystem are also considered, e.g. erosion and coastal flooding, including the costs of planned mitigating measures. This paper emphasises the importance of using valuation methods to help make better-educated decisions for the sustainability of the Baltic Sea.
Źródło:
Oceanologia; 2006, 48, 1
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of weakly basic anion exchanger for removal of Remazol Black B
Autorzy:
Greluk, M.
Hubicki, Z.
Wawrzkiewicz, M.
Wołowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/115782.pdf
Data publikacji:
2011
Wydawca:
Fundacja na Rzecz Młodych Naukowców
Tematy:
Remazol Black B
anion exchanger
sorption
Opis:
The weakly basic anion exchangers of the functional tertiary amine gropus with the polystyrene skeleton: Amberlyst A-21 and with acrylic skeleton: Amberlite IRA-67 were investigated as adsorbents of Remazol Black B from aqueous solutions. Experiments were carried out as function of contact time (1–240 min.), initial dye concentration (50–500 mg/dm3), pH (1–12), temperature (298–318 K) and ionic strength (NaCl). The results indicate that the investigated anion exhchangers are suitab;e as adsorbent material of Remazol Black B from aqueous solutions
Źródło:
Challenges of Modern Technology; 2011, 2, 3; 29-33
2082-2863
2353-4419
Pojawia się w:
Challenges of Modern Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of nodalization effects on the prediction error of generalized finite element method used for dynamic modeling of hot water storage tank
Autorzy:
Wołowicz, M.
Kupecki, J.
Wawryniuk, K.
Milewski, J.
Motyliński, K.
Powiązania:
https://bibliotekanauki.pl/articles/239932.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dynamic modeling
hot water storage tank
modelowanie dynamiczne
zasobnik gorącej wody sieciowej
Opis:
The paper presents dynamic model of hot water storage tank. The literature review has been made. Analysis of effects of nodalization on the prediction error of generalized finite element method (GFEM) is provided. The model takes into account eleven various parameters, such as: flue gases volumetric flow rate to the spiral, inlet water temperature, outlet water flow rate, etc. Boiler is also described by sizing parameters, nozzle parameters and heat loss including ambient temperature. The model has been validated on existing data. Adequate laboratory experiments were provided. The comparison between 1-, 5-, 10- and 50-zone boiler is presented. Comparison between experiment and simulations for different zone numbers of the boiler model is presented on the plots. The reason of differences between experiment and simulation is explained.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 123-138
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
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