Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Optimization of Lamella Burner Fin Deck(Izmir Institute of Technology, 2007) Çetin, Gökçe; Özerdem, Barış; Özerdem, Mehmet Barış; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyLamella burner is a low NOx burner patented by BOSCH Thermotechnologies.In this study, different designs of fin deck, which is one of the major components of the lamella burner, are experimentally analyzed and optimized. After the optimization process, a numerical analysis was used for verification.Emissions are the most important properties for the gas fired boilers and directly related with the design of the burner parts where the combustion occurs. In the lamella burner, fin deck is the most related part with combustion. Combustion occurs on the fin deck surface hence, current fin deck design analysis and optimization is based on the emission rates in order to keep the lamella burner as low-emission (both NOx and CO)burner.This study mainly consists: summary of main parameters regarding combustion and fin deck, experimental analysis, and verification of optimized fin deck model with numerical simulation. Firstly, gas combustion and lamella burner are investigated. Physical conditions and combustion characteristics for fin deck are analyzed and layout parameters for fin deck are deducted. Afterwards, four new fin deck designs are introduced as alternatives for the current design. In the experimental part, emission, light back, flame lift, temperature and pressure drop tests are performed for serial and each new sample in the BOSCH Product Development Laboratories, Manisa. According to the test results, the most preferred sample is defined as optimized one.Test results are discussed to explain whether the fin deck samples are preferable or not. In the combustion curve performance test, CO values are measured. The comparison between the combustion curve test results show that CO formation is related to the fin deck geometry. Geometry affects flame stability because of the differences in mixture velocity distributions. The unburned gas in exhaust is one of the causes of the CO formation and influenced from the flame stability. Therefore,unburned gas mass fractions in exhaust are different for the samples with different geometries. This result is also numerically verified in combustion simulations of two different fin deck models, which one of them is considered as optimized sample.Master Thesis Evaluations of Porous Burner Characteristic Diagrams and Process Water Production Possibilities(Izmir Institute of Technology, 2002) Bacaksız, Fatih; Atagündüz, Gürbüz; Atagündüz, Gürbüz; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyIn recent years, there has been a trend to new developments in gas and oil burners, which have been dominated by the aim of reducing pollutant emissions, reducing burner size and increasing the power modulation range. Several methods have been proposed in order to obtain more efficient combustion systems with low pollutant emissions. Over the past few years, a great deal of investigation on combustion in porous medium has been performed. In its efforts to optimize combustion processes, the Institute of Fluid Dynamics in Friedrich-Alexander University, Erlangen (LSTM-Nürnberg/Germany) has succeeded in developing the technology of combustion in porous media and this burner was used in this study. This thesis was focused on the evaluation of the porous burner characteristic diagrams and determined the possibility of the process water production. The experimental works were consisted of two main parts. One of them was carried out at the Institute of Fluid Dynamics in Erlangen. The second was performed at Izmir Institute of Technology. The aim of the experimental work for 25 kW porous burner was to analyse temperature distribution of exhaust gases close to the outer surface of ceramic matrix as well as pollutant emissions as a function of the burner surface. The aim of the second part was to investigate pollutant emissions as a function of the burner power and excess air ratio numbers, analyse the exhaust gases and cooling water temperature distribution with respect to burner power. Liquefied Petroleum Gas (%70 Butane + %30 Propane) was used as a fuel, which is utility gas in Turkey. It was concluded that the 25 kW burner allow very stable combustion with turn down ratio of around 6:1, and 4:1 for 10 kW burner, and excess air ratio numbers in the range 1.40 - 2.0. The exhaust gas temperature could easily reach 1100°C with a more and less uniform distribution over the 25 kW burner.s exit surface area. It was noticeable that the emission values lie lower than the values given by both German Norm 4702 and International Energy Agency, for 25 kW porous burner. CO an NOX emission values for 10 kW porous burner were quite lower than the emission limits for large new combustion facilities in Turkey. The burner showed that considerable amount of heat was transferred from exhaust gas to cooling water. Finally, porous burner can be used for process water production in various fields of energy engineering.