patented high spin static classifier | coal mill classifier | sas global
The Patented High Spin Static Classifier is available for most style pulverizers and remote classifiers. This SAS Global retrofit features externally adjustable blades that can connected with a dust-tight linkage system, or have individual adjustment points for each blade.
The optional dust-tight linkage stays free from coal build-up for a maintenance free life of smooth operation. The specially designed linkage allows the blades to move together while staying in correct alignment. This guarantees proper blade alignment with every adjustment. The blade adjustment can be made automatically with an actuator or by a single manual lever.
The SAS Adjustable High Spin Static Classifier Retrofit is a proven and reasonable alternative to making the substantial capital commitment required for Dynamic Classifiers. SAS customers have achieved 6% to 15% capacity improvements, while concurrently reaching 99.8% thru 50 mesh and 76.2% thru 200 mesh fineness levels grinding at 42 HGI coal.
The shape and downward extension of the SAS blade takes full advantage of the kinetic energy and rotational flow produced in the grinding area of the pulverizer. As the circumferentially propelled coal particles reach the classifier inlet, the flow is accelerated into the cone and a vacuum condition is developed from the continuously increasing centrifugal acceleration.This phenomenon effectively turns your classifier into a cyclone separator.
classification performance of model coal mill classifiers with swirling and non-swirling inlets - sciencedirect
The classification performance of model coal mill classifiers with different bottom incoming flow inlets was experimentally and numerically studied. The flow field adjacent to two neighboring impeller blades was measured using the particle image velocimetry technique. The results showed that the flow field adjacent to two neighboring blades with the swirling inlet was significantly different from that with the non-swirling inlet. With the swirling inlet, there was a vortex located between two neighboring blades, while with the non-swirling inlet, the vortex was attached to the blade tip. The vorticity of the vortex with the non-swirling inlet was much lower than that with the swirling inlet. The classifier with the non-swirling inlet demonstrated a larger cut size than that with the swirling inlet when the impeller was stationary (~0rmin-1). As the impeller rotational speed increased, the cut size of the cases with non-swirling and swirling inlets both decreased, and the one with the non-swirling inlet decreased more dramatically. The values of the cut size of the two classifiers were close to each other at a high impeller rotational speed (120rmin-1). The overall separation efficiency of the classifier with the non-swirling inlet was lower than that with the swirling inlet, and monotonically increased as the impeller rotational speed increased. With the swirling inlet, the overall separation efficiency first increased with the impeller rotational speed and then decreased when the rotational speed was above 120rmin-1, and the variation trend of the separation efficiency was more moderate. As the initial particle concentration increased, the cut sizes of both swirling and non-swirling inlet cases decreased first and then barely changed. At a low initial particle concentration (<0.04kgm3), the classifier with the swirling inlet had a larger cut size than that with the non-swirling inlet.
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numerical and experimental analysis of pulverized coal mill classifier performance in the soma b power plant - sciencedirect
Gas and coal particle flows inside the classifier for a PP is numerically modelled.Boundary conditions are from initial measurements and isokinetic coal samples.Eulerian/Lagrangian approach and Reynolds stress turbulence model were applied.Coal mass flow rate and size distribution at the exit of classifier was checked.One design is tested with different inner plate adjustments.Numerical model validation and performance tuning are performed with test results.
Coal particle separation in a classifier after the pulverization process in power plants (PP) is very important to obtain the desired level of coal fineness while reducing unburned carbon losses and slagging potential. In this study, flow inside of the coal mill classifier of Soma B PP suffering from low boiler efficiency due to high unburned carbon loss was numerically analyzed with respect to its initial flow measurements and isokinetic coal samples at the exit of the classifier as a base case. In the numerical analyses, a Eulerian/Lagrangian approach and a Reynolds stress turbulence model (RSTM) were applied. To increase coal separation efficiency, four different designs were numerically analyzed and the results were compared to the results of the base case by accounting for the total mass flow rate to the burners and coal size distribution at the outlet of the classifier. Among them design D-21 was chosen and applied to the PP mill classifier. Finally, this design was tested in a PP with different inner plate adjustments, and there was good agreement between the numerical and experimental results with a maximum difference of 2.5% for the individual coal size distributions and a cumulative maximum difference of 5% for the total coal size distributions. The assumption of a decreasing regrind outlet of coal flow rate by plate adjustment in the classifier for D-21 appears to be sufficient to increase total coal flow rate to the burners. In the tests, operating the mill at lower load conditions resulted in a finer coal size distribution at the outlet.