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Razvoj modela in optimizacija kotla s fluidiziranim slojem
Delavec, Miha (Author), Katrašnik, Tomaž (Mentor) More about this mentor... This link opens in a new window

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Abstract
V delu je predstavljena metodologija za poenostavljeno modeliranje fluidiziranega sloja v kotlih, ki za gorivo uporabljajo biomaso. Pristop se opira na energijsko bilanco procesa uplinjanja, ki jo je mogoče opisati v okvirih omejitev komercialne kode za 3D-analizo zgorevanja. Metodologija je nato uporabljena na modelu 9 MW kotla na biomaso in validirana s pomočjo meritev temperatur v realni napravi. Model izkazuje zadovoljivo funkcionalnost ter glede na poenostavitve in dosežene računske čase dosega smiselno natančne rezultate, ki jih je mogoče uporabiti pri usmeritvah optimizacije tokovnega in temperaturnega polja v kotlu. Na podlagi validiranega modela je nato v nalogi obravnavan tudi vpliv sekundarnih dovodov zraka na zgorevalni proces v kotlu z ozirom na njihovo lokacijo, število in distribucijo zraka v smislu svežega zraka in recirkuliranih dimnih plinov. Ključna ugotovitev, ki izhaja iz študije, je potrjena možnost poenostavljenega modeliranja fluidiziranega sloja goriva ter predlog reorganizacije dovodov zraka v smeri, ki omogoča ustreznejši tokovno/temperaturni režim in predvidoma zmanjša možnost nastanka depozitov na stenah zgorevalne komore.

Language:Slovenian
Keywords:lesna biomasa, utekočinjanje, kurišče s tekočinskim slojem, zgorevanje, onesnažila, numerična simulacija
Work type:Master's thesis/paper (mb22)
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Views:580
Downloads:281
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Secondary language

Language:English
Title:Numerical model development and optimization of the fluidized bed boiler
Abstract:
The Master’s thesis presents the methodology for simplified modeling of the fluidized bed in the boiler, which uses wood biomass as a primary fuel for combustion. Methodology is based on energy balance of the gasification process that can be described within the limiting frame of reference of the commercial code for the 3D combustion analysis. The developed methodology is then used on the model of 9MW boiler combusting wood biomass and validated using temperature measurements preformed on the actual boiler of our industrial partner. Produced model shows satisfactory functionality and regarding to the used simplification and needed computing times it was able to give us reasonably accurate results that can be used for further directions in optimization process of the flow and temperature field in the boiler. On the basis of validated model we further looked into the problem of secondary air inlets effect. We studied secondary air intake effect on the boiler combusting process phenomena regarding to their number, location and air distribution in terms of ratio between fresh gas and recirculated flue gasses. A key contribution from the study is confirmed possibility of simplified modeling of fluidized bed combustion and findings about the reorganization of air inlets. We reorganized air inlets in a way that led to the establishment of more suitable flow and temperature regime, which will presumably enable us to reduce the possibilities of formation of deposits on the wall of the combustion chamber.

Keywords:wood biomass, fluidization, bubbling fluidized bed furnace, burning, emissions, numerical simulation

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