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Wyświetlanie 1-3 z 3
Tytuł:
Computational Modelling of a Tangentially Fired Boiler With Deposit Formation Phenomena
Autorzy:
Modliński, N.J.
Powiązania:
https://bibliotekanauki.pl/articles/185644.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
pył węglowy
CFD
kocioł pyłowy
tangentially fired furnace
deposit formation
pulverised coal
Opis:
Any complete CFD model of pulverised coal-fired boiler needs to consider ash deposition phenomena. Wall boundary conditions (temperature and emissivity) should be temporally corrected to account for the effects of deposit growth on the combustion conditions. At present voluminous publications concerning ash related problems are available. The current paper presents development of an engineering tool integrating deposit formation models with the CFD code. It was then applied to two tangentially-fired boilers. The developed numerical tool was validated by comparing it with boiler evaporator power variation based on the on-line diagnostic system with the results from the full CFD simulation.
Źródło:
Chemical and Process Engineering; 2014, 35, 3; 361-368
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between air flow rate and pollutant concentrations during two-stage oak log combustion in a 25 KW residential boiler
Autorzy:
Juszczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/184902.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wood combustion
pollutant emission
heating boiler
heat station
spalanie drewna
emisja zanieczyszczeń
kocioł grzewczy
stacja ciepła
Opis:
It can be expected that there is a considerable correlation between combustion air flow rate and the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas. The influence of temperature and oxygen concentration in the combustion zone on the concentrations of carbon monoxide, hydrocarbons and nitrogen oxide in the flue gas, for high and low combustion air flow, was analysed. Oxygen concentration for which the concentration of carbon monoxide is the lowest was determined, as well as the mutual relation between carbon monoxide and nitrogen oxide concentration.
Źródło:
Chemical and Process Engineering; 2016, 37, 3; 419-428
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
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
    Wyświetlanie 1-3 z 3

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