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Developing and Testing Characterization Methods for Droplet Combustion. Part I

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Pääkkönen A. , Peltola A. , Pitkänen A. , Mäkiranta R. , Saario A. , Oksanen A.

2010

tom Vol. 30 nr 4

361-366

The final aim of this work is to make a vertical two-stage drop tube reactor (DTR) consisting of two different parts which can be used to characterize liquid fuel droplets during combustion. The main attention will be focused on liquid bio fuels and especially on the reaction rates of residual char particles. The work is done in two parts: in the first part a reactor for vaporizing oil droplets was built and tested, and in the second part another reactor will be built under the first one. The second reactor will be used to characterize the combustion of the residual coke, cenosphere, formed from liquid fuel. At this stage the DTR is tested with heavy fuel oil (HFO) because of its importance as fuel and also for its well known characteristics. In the first part of the work, efforts were put into the upper DTR which was used to vaporize the HFO droplets. The test equipment was built around the drop tube, where commercial mass flow controller and droplet generator were connected. The drop tube itself and a particle collector were built in the Department of Energy and Process Engineering at TUT. Optical measurement devices play an important role in the information collection. Droplets and cenospheres are photographed through a transparent window using a high speed digital camera and diode-laser. An analysis program developed at the Department was used to predict the droplets’ diameters and velocities as well as the residence times. In these experiments it was possible to achieve good repeatability and to examine different stages of evaporation. However, during the experiments volatile yield was not constant and it seemed to be temperature dependent.