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Wyszukujesz frazę "supercritical CFB boiler" wg kryterium: Wszystkie pola


Wyświetlanie 1-6 z 6
Tytuł:
A simplified methodolgy for scaling hydrodynamic data from Lagisza 460 MWC supercritical CFB boiler
Autorzy:
Mirek, P.
Powiązania:
https://bibliotekanauki.pl/articles/185646.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrodynamika
skalowanie
złoże fluidalne
hydrodynamics
circulating fluidized bed
scaling
Opis:
The paper presents the results of model studies on the hydrodynamics of the world's first supercritical circulating fluidized bed boiler Lagisza 460 MWe, carried out on a scale model built in a scale of 1/20 while preserving the full geometrical similarity. To reflect the macroscopic pattern of flow in the boiler's combustion chamber, tests were carried out based on two dimensionless flow dynamic similarity criteria, while maintaining a constant Froude number value between the commercial and the scaled-down units. A mix of polydispersion solids with its fractional composition determined by scaling down the particle size distribution of the boiler's inert material was utilised for the tests using a special scaling function. The obtained results show very good agreement with the results of measurements taken on the Lagisza 460 MWe supercritical CFB boiler.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 245-253
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler
Autorzy:
Błaszczuk, A.
Nowak, W.
Jagodzik, S.
Powiązania:
https://bibliotekanauki.pl/articles/240941.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer coefficient
cluster renewal approach
bed particle size
suspension density
circulating fluidized bed
współczynnik wnikania ciepła
wielkość cząstek
gęstość zawiesiny
cyrkulacyjna warstwa fluidalna
Opis:
Experimental research has been carried out in a supercritical circulating fluidized bed combustor in order to indicate the effect of the bed particle size on bed-to-wall heat transfer coefficient. The bed inventory used were 0.219, 0.246 and 0.411 mm Sauter mean particles diameter. The operating parameters of a circulating fluidized bed combustor covered a range from 3.13 to 5.11 m/s for superficial gas velocity, 23.7 to 26.2 kg/(m2s) for the circulation rate of solids, 0.33 for the secondary air fraction and 7500 to 8440 Pa pressure drop. Furthermore, the bed temperature, suspension density and the main parameters of cluster renewal approach were treated as experimental variables along the furnace height. The cluster renewal approach was used in order to predict the bed-to-wall heat transfer coefficient. A simple semi-empirical method was proposed to estimate the overall heat transfer coefficient inside the furnace as a function of particle size and suspension density. The computationally obtained results were compared with the experimental data of this work.
Źródło:
Archives of Thermodynamics; 2014, 35, 3; 207-223
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of sampling point on solids suspension density applied in scaling of the hydrodynamics of a supercritical CFB boiler
Autorzy:
Mirek, P.
Ziaja, J.
Powiązania:
https://bibliotekanauki.pl/articles/185607.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hydrodynamika
skalowanie
circulating fluidised bed
hydrodynamics
scaling
Opis:
The article presents the results of laboratory tests carried out on a scaling model of the 966MW the fluidised-bed boiler operating in the Lagisza Power Plant, made on a scale of 1:20 while preserving the geometrical similarity. The tests were carried out for scaled-down material taken from different locations on the circulation contour in the state of full boiler loading. To reflect the hydrodynamic conditions prevailing in the combustion chamber, solids with properly selected density and particle size distribution were used. The obtained results have made it possible to determine the location for taking the most representative granular material sample.
Źródło:
Chemical and Process Engineering; 2011, 32, 4; 391-399
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristics modeling for supercritical circulating fluidized bed boiler working in oxy-combustion technology
Autorzy:
Balicki, A.
Bartela, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/240453.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermodynamic analysis
oxy-combustion
supercritical CFB boiler
analiza termodynamiczna
oksyspalanie
nadkrytyczny kocioł CFB
Opis:
Among the technologies which allow to reduce greenhouse gas emission, mainly carbon dioxide, special attention deserves the idea of 'zero-emission' technology based on boilers working in oxy-combustion technology. In the paper the results of analyses of the influence of changing two quantities, namely oxygen share in oxidant produced in the air separation unit, and oxygen share in oxidant supplied to the furnace chamber on the selected characteristics of a steam boiler including the degree of exhaust gas recirculation, boiler efficiency and adiabatic flame temperature, was examined. Due to the possibility of the integration of boiler model with carbon dioxide capture, separation and storage installation, the subject of the analysis was also to determine composition of the flue gas at the outlet of a moisture condensation installation. Required calculations were made using a model of a supercritical circulating fluidized bed boiler working in oxy-combustion technology, which was built in a commercial software and in-house codes.
Źródło:
Archives of Thermodynamics; 2014, 35, 2; 51-63
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bed-to-wall heat ransfer in a supercritical circulating fluidised bed boiler
Autorzy:
Błaszczuk, A.
Nowak, W.
Jagodzik, S.
Powiązania:
https://bibliotekanauki.pl/articles/185814.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
współczynnik przenoszenia ciepła
gęstość zawiesiny
temperatura pieca
kocioł CFB w stanie nadkrytycznym
heat transfer coefficient
suspension density
furnace temperature
circulating fluidised bed
supercritical CFB boiler
cluster renewal approach
Opis:
The purpose of this work is to find a correlation for heat transfer to walls in a 1296 t/h supercritical circulating fluidised bed (CFB) boiler. The effect of bed-to-wall heat transfer coefficient in a long active heat transfer surface was discussed, excluding the radiation component. Experiments for four different unit loads (i.e. 100% MCR, 80% MCR, 60% MCR and 40% MCR) were conducted at a constant excess air ratio and high level of bed pressure (ca. 6 kPa) in each test run. The empirical correlation of the heat transfer coefficient in a large-scale CFB boiler was mainly determined by two key operating parameters, suspension density and bed temperature. Furthermore, data processing was used in order to develop empirical correlation ranges between 3.05 to 5.35 m x s-1 for gas superficial velocity, 0.25 to 0.51 for the ratio of the secondary to the primary air, 1028 to 1137K for bed temperature inside the furnace chamber of a commercial CFB boiler, and 1.20 to 553 kg x m-3 for suspension density. The suspension density was specified on the base of pressure measurements inside the boiler’s combustion chamber using pressure sensors. Pressure measurements were collected at the measuring ports situated on the front wall of the combustion chamber. The obtained correlation of the heat transfer coefficient is in agreement with the data obtained from typical industrial CFB boilers.
Źródło:
Chemical and Process Engineering; 2014, 35, 2; 191-204
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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
    Wyświetlanie 1-6 z 6

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