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1. The Concept of Gas-Solid Mixing Coefficient for Pulverized Coal Swirl Burner | |||
ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui | |||
Dynamic and Electronic Engineering 06 January 2011 | |||
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Abstract:The stable combustion of swirl burner is assessed usually by the size of the central recirculation zone (CRZ), the quantity of recirculated flow and the concentration of pulverized coal flow, while the mixing time and intensity between high temperature flue gas and the pulverized coal are not considered. This paper put forward the concept of mixing coefficient that is used as the assessment of the mixing speed and intensification between the pulverized coal-air flow and the recirculation high temperature gas. Through the mathematics simulation, the mixing coefficients of the general bluff-body stabilizer, the petal flame stabilizer, and the common swirl burner and petal swirl burner are analyzed. The results show that the mixing coefficient can perfectly predict the mixing of the boundary of CRZ, which is important to deepen the investigation in stable combustion and flow field for swirl burner in energy consuming industry. | |||
TO cite this article:ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui. The Concept of Gas-Solid Mixing Coefficient for Pulverized Coal Swirl Burner[OL].[ 6 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4403903 |
2. Flow Patterns of New Type Flame Stabilizer in P.F. Combustor | |||
ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui | |||
Dynamic and Electronic Engineering 04 January 2011 | |||
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Abstract:A new type of flame stabilizer called Petal Flame Stabilizer (PFS) is put forward for the P.F. swirl burner of power plant boiler to increase the flame stability. A three-dimensional (360 degree) mathematical model is set up to analyze the mechanisms of the flame ignition and to compare the performance of PFS with the common bluff-body stabilizer in the same conditions. The research results show that the flow pattern PFS formed 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 mass and heat transfer depends 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. | |||
TO cite this article:ZHAO Lingling,ZHOU Qiangtai,ZHAO Changsui. Flow Patterns of New Type Flame Stabilizer in P.F. Combustor[OL].[ 4 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4403897 |
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