Digitale Bibliotheek
Sluiten Bladeren door artikelen uit een tijdschrift
 
<< vorige    volgende >>
     Tijdschrift beschrijving
       Alle jaargangen van het bijbehorende tijdschrift
         Alle afleveringen van het bijbehorende jaargang
           Alle artikelen van de bijbehorende aflevering
                                       Details van artikel 4 van 9 gevonden artikelen
 
 
  MEASUREMENTS OF GAS SPECIES, TEMPERATURE, AND CHAR BURNOUT IN A LOW-NO X PULVERIZED-COAL-FIRED UTILITY BOILER
 
 
Titel: MEASUREMENTS OF GAS SPECIES, TEMPERATURE, AND CHAR BURNOUT IN A LOW-NO X PULVERIZED-COAL-FIRED UTILITY BOILER
Auteur: Costa, M.
Silva, P.
Azevedo, J. L. T.
Verschenen in: Combustion science and technology
Paginering: Jaargang 175 (2003) nr. 2 pagina's 271-289
Jaar: 2003-02
Inhoud: Measurements have been performed in a 300-MW e , front-wall-fired, pulverized-coal utility boiler. New data are reported for local mean gas species concentrations of O 2 , CO, CO 2 , and NO x , gas temperatures, and charburnout measured at several ports in the boiler including those in the burner region. They complement previously obtained data in the same utility boiler before being retrofitted with low-NO x burners and over-fire air ports. During the current experimental work, a considerable effort was made to assure minimum variations on boiler operating conditions and coal chemical and particle size characteristics so that the data presented are especially useful for three-dimensional mathematical model evaluation and development. The main conclusions are as follows: (1) As compared with our previousmeasurementsin this boiler, prior to the retrofitting, the results show lower local mean O 2 and higher CO concentrations and temperatures in the boiler as a consequence of the lower stoichiometry in the main combustion zone, after retrofitting. (2) At the lower levels of the boiler the measured NO x concentrations are comparable with those obtained prior to the retrofitting but they are inferior at the upper levels of the boiler, which is consistent with the lower NO x emissions observed at the boiler exit, after retrofitting; specifically, 620 compared with 997 mg/Nm 3 prior to the retrofitting. (3) At the lower levels of the boiler, the high local mean char burnout values measured are due to the combined effects of significant presence of O 2 and relatively large residence times of the particles, while at the upper levels of the boiler the particles' residence time is the critical quantity influencing char burnout. (4) Results indicate that carbon isreleased at about the same rate as total coal mass release while both hydrogen and nitrogen are released more rapidly.
Uitgever: Taylor & Francis
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

                             Details van artikel 4 van 9 gevonden artikelen
 
<< vorige    volgende >>
 
 Koninklijke Bibliotheek - Nationale Bibliotheek van Nederland
Toegankelijkheidsverklaring