Abstract
The operation of boiler units is often conducted with increased excess air α due to the non-uniform distribution of air between the burners, which leads to an efficiency factor lowering. This problem can be solved by optimizing the design and laying of the air ducts. Selection of the optimal air ducts design is based on the preliminary model investigations. In this paper, the issue of optimizing the air ducts aerodynamics of the PK-14 boiler is studied. The boiler air path is characterized by a significant difference in length and trace configuration for each burner. The situation is complicated by the combined combustion of natural and blast-furnace gas in the boiler furnace. Nonuniformity of air distribution between natural gas burners reaches 20% and between blast-furnace gas burners up to 40%. Thereby in order to maintain stable fuel combustion, it is necessary to increase the excess air to α ≥ 1.3. In this paper, the current and the optimized developed by the authors variant of this air duct section are investigated by the means of numerical simulation. According to the results of numerical modeling, it was found out that the optimized variant allows to achieve the degree of air distribution nonuniformity not exceeding 3% and reduce the aerodynamic drag of the air duct section by 1.6 times. In the future, verification of the numerical modeling results for the optimized variant of air duct on a physical model is assumed.
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