A master thesis from Aalborg University
Predicting flammability limits for hydrocarbons gases and mixtures with nitrogen as inert gas
[Forudsigelse af brandbarhedsgrænser for kulbrinter og blandinger med nitrogen som inert gas]
Author(s)
Term
4. semester
Education
Publication year
2019
Submitted on
2019-05-31
Pages
35 pages
Abstract
At kunne forudsige brandbarhedsgrænser er vigtigt, når det kommer til sikker håndtering af brandbare gasser så som kulbrinter. Teorien omkring detter emne er ikke helt udarbejdet endnu, men der eksisterer nogle teoretiske metoder så som Le Chatelier's blandingsregel. En model var lavet til at forudsige brandbarhedsgrænser for kulbrinter og blandinger med inert gas. Modellen var opbygget som en combustor med masseflowcontrollere til at justere molarfraktionerne af gasserne i blandingen. Blandingen blev andtændt ved brug af en kort puls af hydrogen radikaler. Reaktionsmekanismen brugt i modellen var gri30, siden den har værdier for methan, ethan og propan samt andre gasser som er til stede i forbrænding. Resultater fra moddel blev sammenlignet med eksperimentelle data fra Kuchta og Zhao, og viste at være i stand til at forudsige brandbarhedsegenskaber af mindre kulbrinter, med nogle undtagelser når ethan var til stede.
Predicting flammability limits of gases is of importance, when it comes to safety, when handling combustible gases such as hydrocarbons. The theory of this topic is not fully explored yet, but some theoretical approaches such as the Le Chatelier's mixing rule exists. A model was made for predicting flammability limits of hydrocarbons and mixtures with inert gas present. The model was build as a combustor using mass flow controllers, to adjust the molar fractions of gases in the mixture. The mixture was ignited using a short pulse of hydrogen radicals. The reaction mechanism used in the model was gri30, as it has properties for methane, ethane and propane along with other gases present in combustion. Results from the model were compared to experimental data from Kuchta and Zhao, and proved to be capable of predicting flammability properties of smaller hydrocarbons, with some exceptions when ethane was present.
Keywords
Documents
Colophon: This page is part of the AAU Student Projects portal, which is run by Aalborg University. Here, you can find and download publicly available bachelor's theses and master's projects from across the university dating from 2008 onwards. Student projects from before 2008 are available in printed form at Aalborg University Library.
If you have any questions about AAU Student Projects or the research registration, dissemination and analysis at Aalborg University, please feel free to contact the VBN team. You can also find more information in the AAU Student Projects FAQs.