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Analiza pogojev zgorevanja v sekundarni komori pilotne sežigalnice na podlagi računske dinamike tekočin
Kokalj, Filip (Author), Samec, Niko (Author), Škerget, Leopold (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-GE4W8TS5 This link opens in a new window

Abstract
Predstavljena je numerična analiza zgorevanja v sekundarni komori (termoreaktorju) dvostopenjske pilotne sežigalnice z uporabo računske dinamiketekočin (RDT-CFD). Z raziskavo smo se osredotočili na analizo fizikalnih pogojev popolnega zgorevanja, kakor so temperatura, čas zadrževanjain turbulentno mešanje. Uporabili smo več izvedb programov vrste CFX za RDT, ki omogočajo uporabo različnih modelov zgorevanja v odvisnosti od vrste in načina zgorevanja. Izbira ustreznega modela zgorevanja je potekala napodlagi primerjave numeričnih rezultatov z izmerjenimi vrednostmi nekaterih makroparametrov zgorevanja v termoreaktorju. Uporabili smo modele na temelju enostopenjske bimolekularne kemijske reakcije in modela večstopenjskih reakcij, ki omogočata bolj natančno napoved dogajanja v sekundarni komori pilotne sežigalnice. Z večstopenjskima modeloma lahko izračunamo lokalne koncentracije ostankov nepopolnega zgorevanja, kar je izrednega pomena za primerno oblikovanje in optimiranje kurilnih naprav. Na podlagi izbranega modela zgorevanja je izvedena temeljna analiza zgorevanja v termoreaktorju z vidika doseganja pogojev popolnega zgorevanja pri različnih obratovalnih razmerah, ki so posledica spremenljive količine, sestave in kurilne vrednosti plinov iz primarne komore. Prišli smo do pomembne ugotovitve, da na kakovost zgorevanja v termoreaktorju v največji meri vplivata naèčn dovoda sekundarnegain terciarnega zraka ter njuno razmerje.

Language:Slovenian
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2005
Publisher:Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:str. 280-303
Numbering:Letn. 51, št. 6
UDC:662.92:536.46
ISSN on article:0039-2480
COBISS.SI-ID:8411419 Link is opened in a new window
Views:221
Downloads:71
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
ISSN:0039-2480
COBISS.SI-ID:762116 This link opens in a new window

Secondary language

Language:English
Title:An analysis of the combustion conditions in the secondary chamber of a pilot-scale incinerator based on computational fluid dynamics
Abstract:
A numerical analysis of the combustion in the secondary chamber (thermoreactor) of a two-stage pilot-scale incinerator using computational fluid dynamics (CFD) is presented. The focus of the research was on those physical conditions that ensure complete combustion, i.e., temperature, residence time and turbulent mixing. Various versions of the CFD program package CFX were used; they offer different combustion models for specific types and forms of combustion processes. The selection of an appropriate combustion model was based on a comparison of the numerical results and experimental values of some combustion macro parameters in a thermoreactor. Combustion models based on a one-step bimolecular chemical reaction and modelsbased on multi-step reactions were usedč this enabled a more detailed prediction of the combustion conditions in the secondary chamber of a pilot-scale incinerator. The products of incomplete combustion that are very important for the designing and optimization of combustion devices can be predicted by applying multi-step reaction models. An ultimate analysis of the complete combustion conditions was made based on a selected combustion model by considering those different operating conditions, causing variations in thequantity, composition and heating values of the gases coming from the primary chamber. The important conclusions are that the secondary and tertiaryair intakes and the relationship between them have the greatest influence on the combustion quality in the thermoreactor.

Keywords:combustion, numerical analysis, combustion models, computation fluid dynamics

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