Abstract
An experimental model of a corner-injected flow is built to investigate the turbulent flow behavior by employing the PIV technique. The influences of the ideal tangential circle, the additive particles and the initial gas mass flux on the corner-injected flow are analyzed systematically. To be specific, the flow deviation, the velocity profile, the vortex evolution and the turbulent flow development are discussed quantitatively. The influences of the increasing ideal tangential circle on the turbulent jet deviation are shortened gradually, and the impinging circles are obviously narrowed with the injection of particles. The gas-particle corner-injected flow can obtain a good rotation when the ideal tangential circle is 0.25 times the width of the impinging chamber. The momentum decay of the corner-injected flow diminishes with the increasing ideal tangential circle and the decreasing initial gas velocity. The rotation strength of the vortex is more affected by the injection of laden particles, while the angular distortion enhances when increasing the ideal tangential circle. The increasing initial gas mass flux plays a dominant role in the development of the corner-injected flow, secondly the increasing ideal tangential circle, and last the injection of particles. All these findings can provide theoretical support in the design of a corner-fired furnace.
Highlights
The aim of this study is to investigate the influences of the ideal tangential circle and initial velocity on gas-particle flow behaviors emphasized in this study
The appropriate tangential circle is of great significance for the operation of the industrial pulverized coal-fired boilers because the big circle will lead to serious coal slagging in the water walls and the small circle will result in uneven coal distribution in the chamber
The turbulent flow deviation becomes unstable with the growing tangential circle
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Fired boilers are widely applied in coal-fired power plants in Asian countries, and the corner-injected flow is the fundamental configuration in tangentially fired boilers [1]. The four adjacent jets create an intensive rotation flow in the whole chamber, resulting in an increase in the momentum and energy transfer between coal and gas [2]. Many studies have been conducted on the tangentially fired furnace to investigate the flow behaviors, combustion efficiency and pollutant emissions [3,4,5,6,7,8]
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