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2012, vol. 38, br. 2, str. 145-151
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Uticaj smera dovođenja sekundarnog vazduha na produženje vremena zadržavanja gasova u ložištu
Influence of direction of secondary air supply to extension of gas residence time in furnace
Univerzitet u Novom Sadu, Fakultet tehničkih nauka
e-adresa: bstep@uns.ac.rs
Projekat: Razvoj metoda, senzora, i sistema za praćenje kvaliteta vode, vazduha i zemljišta (MPNTR - 43008)
Sažetak
Karakteristika biomase je visok sadržaj volatila, lako isparljivih materija. Da bi se obezbedilo njihovo potpuno sagorevanje jedna od mogućnosti je u produženju vremena zadržavanja gasova u zonama u kojima je temperatura iznad temperature paljenja. U suprotnom, neiskorišćenje ove energije dovodi do potrebe za povećanom potrošnjom goriva, i samim tim do većeg zagađenja okoline. U ovom radu se prikazuje kako ugao dovođenja sekundarnog vazduha utiče na vreme zadržavanja gasova. Da bi se proučio ovaj uticaj, usled velike složenosti spregnutih procesa koji se odvijaju u ložištu posmatra se problem izotermnog strujanja. Ovaj pristup je podržan i često primenjivan u literaturi. Rezultati pokazuju razliku u srednjem vremenu zadržavanja gasova između najboljeg i najlošijeg slučaja od 20%.
Abstract
Biomass characteristic is a high content in volatiles, substances easily vaporized. In order to secure their complete combustion one of options is to increase the gas residence time in zones in which the temperature is above the ignition temperature. Not utilisation of this energy results in increase of fuel consumption and to greater environmental pollution. In this paper is presented how angle of secondary air supply influences gas residence time. In order to study this influence, due to the high complexity of the coupled phenomena occurring in furnace, problem of isothermal flow is set. This approach is supported and frequently applied in the literature. Results show difference in average residence time between the best and worse case of 20%.
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