EXTENSION OF THE RESOURCE OF THE BURNER SWIRL BLADES OF THE BOILER TPP-312

Abstract

Numerical research of high-temperature corrosion of steel blades of the swirler of a pulverized coal burner of the TPP-312 boiler in real conditions of its operation is carried out. Data on the dynamics of oxidation of the blade surface for two steels and different operating conditions of the burners were obtained. The results of the calculation allow a reasonable assessment of the service life of the blades of the burner device. Corrosion rate calculations were performed based on the results of computer simulation of pulverized coal combustion in the boiler volume with subsequent determination of the temperature field on the blade surface.
 The corrosion dynamics was determined using the experimental oxidation constants of steel given in the literature. Data were obtained for two types of low-carbon steel, two different modes of burner operation, for the number of blades 8 and 24, and for different distances of burner blades from the embrasure of the boiler furnace, a total of 16 different variants were calculated.
 Calculations have shown that with increasing the distance of the blades from the embrasure of the furnace, corrosion is significantly reduced. The highest corrosion, which in its absolute value is comparable to the thickness of the blade, occurs for the disconnected burner with blades from Art. 3. The lowest corrosion occurs for the working burner with blades made from steel 20 (reduction of corrosion by 4 times), and for the disconnected burner this dependence is much smaller (reduction of corrosion by 30… 40%). References 6, Figures 5