Numerical Analysis On The Flow Field Of Petal Stabilizer
PROCEEDINGS OF THE 6TH INTERNATIONAL SYMPOSIUM ON COAL COMBUSTION（2007）
SE Univ
Abstract
A new type of flame stabilizer called Petal Flame Stabilizer (PFS) is put forward for the RE swirl burner of Power Plant boiler to increase the flame stability. A three-dimensional (360) mathematical model is set up to analyze the mechanisms of the flame ignition and to compare the performance of PFS with the common bulff-body stabilizer in the same conditions. The research results show that because of the special design of PFS, a special flow pattern is formed which consists of a radial and a pair of axial recirculation zones at the leeward of each petal of PFS besides the central recirculation zone (CRZ). The recirculation zones at the leeward of each petal are combined with the central recirculation zone, which transfers the heat flow with the high temperature flow gas to the coal-air flow, and accelerates the firing of the pulverized coal. The violent recirculation flow enhances the convection mixing between the pulverized coal flow and the high temperature gas flow, increases the heat and mass transfer between them. The mass and heat transfer depend on not only the fluctuation of microscopic turbulence at the edge of the recirculation zone which are the main drive force in the conventional swirl burner, but also the great-intensity macroscopic convection transfer. This special flow pattern (multi- recirculation zone) of PFS provides steady heat source, and is propitious for the stable combustion of pulverized coal, especially of the low volatile coal, and for the turndown capacities. This work provides a. useful reference for further PFS design.
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Key words
petal flame stabilizer, numerical simulation, flame stability, flow pattern
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