Research on the Air Dynamic of 1000MW Ultra-Supercritical Lignite-Fired Boiler

This thesis studies furnace air dynamic of 1000MW ultra-supercritical lignite-fired boiler to provide reference to develop firing system of 1000MW ultra supercritical lignite-fired boiler with independent intellectual property rights. Constant-temperature hot wire anemometer is used to study furnace air dynamic field. The results indicate that in the single-furnace double tangent air distribution form, the air flow in left-right semi-furnace can respectively organize stable air dynamic field, that two tangent air streams can relevant independently exit with less impact, and no matter which section is in the tangent will be obliquely elliptic, the symmetry of air distribution and fullness degree of furnace are better. Some basic factors such as position of burner and jet angle determine that imaginary tangent in essence is ellipse with a little deviation, the actual deviation of jet is not the same. Equivalent deviation of imaginary air stream makes the obliquely elliptic air stream elongated with clear deviation, in fact unequal deviation results in more elongated obliquely ellipse with more deviation extent, and finally it can be the evident obliquely elliptic air stream in actual air dynamic field.