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The flow field of three geometry models 90-degree vertical to horizontal elbow, three-level conical rings concentrator and the combination of elbow and concentrator have been studied by simulation method. The velocity magnitude, relative mean axial velocity, relative mean radial velocity and axial particle volume flux has been analyzed. Elbow results in the asymmetry of its downstream flow field and...
The flow field within a three-level conical ring concentrator of a centrally-fuel-rich swirl coal combustion burner has been studied both experimentally and numerically. Measured and calculated values of gas velocities downstream from the third conical ring are in good agreement. In the outlet region after the third-level ring, a peak and a valley in the mean axial velocity profiles are seen to move...
This paper presents a systematic study of the cold flow characteristics of a central fuel rich swirl burner. Flow fields at the burner outlet corresponding to various primary and inner secondary air ratios were measured. With decreasing primary air ratio and increasing inner secondary air ratio, the swirl intensity of the jet increases, mixing between primary and secondary air is enhanced, and the...
-To overcome the problem of high carbon content in the fly ash of down-fired utility boilers using low-volatility coals, the combustion system of a 660 MWe full-scale down-fired boiler was retrofitted with many items: louver concentrators was adopted, the fuel-lean flow is laid near the wall, the F-tier secondary air is modified with an angle of declination of 20°. Industrial experiments were performed...
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