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http://dx.doi.org/10.3795/KSME-B.2013.37.2.187

Analysis of Density Wave Oscillation in Boiler Furnace Wall Tubes with Parallel Channel Modeling  

Kim, Jinil (System Engineering Team, Corporate R&D Institute, Doosan Heavy Industries and Construction)
Choi, Sangmin (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.2, 2013 , pp. 187-196 More about this Journal
Abstract
A numerical model was developed to predict the density wave oscillation (DWO) in the furnace wall tubes of a fossil-fired once-through boiler. The transient flow fields in the tubes were obtained using a 1D finite volume method in the time domain. A header model was also implemented to simulate the parallel tube connection of the wall tubes. The inlet and outlet mass flow variation in one of the parallel tubes was examined after a heat perturbation to find the DWO. After successful verification with experimental results reported in literature, the developed model was applied to the wall tubes of a 700-MW boiler furnace. In contrast to the simulation of Takitani's experiment, in which the unstable power thresholds tended to rise in the reduced bypass channel flow, no remarkable changes were observed in the power thresholds in the parallel channel modeling of the wall tubes of the boiler furnace.
Keywords
DWO; Dynamic Instability; Furnace Wall Tubes; Two Phase Flow; Parallel Channel;
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