Solid material comminution or disintegration – Apparatus – With separation or classification of material
Patent
1985-05-02
1987-03-31
Bashore, S. Leon
Solid material comminution or disintegration
Apparatus
With separation or classification of material
241119, 209138, 209144, 209154, B07B 708, B02C 2312
Patent
active
046536990
ABSTRACT:
Centrifugal air classifiers without rotating classifying blades are frequently used in present-day coal-fired power stations. For economical reasons, these obtain the coal to be burnt from different sources so that the pulverized-coal furnaces are operated with coals of varying quality. In this arrangement, it is disadvantageous that, when coals of particularly low quality are burnt, this classifier is not capable of supplying the fineness of pulverized coal required for proper combustion. The invention has the object of creating a centrifugal air classifier of the type initially mentioned which provides the possibility of proper combustion of several types of coal in a pulverized-coal furnace. This object is achieved when, in the feed duct for the mixture of material to be classified and carrier gas, a jacket is arranged which surrounds the coarse-material collecting hopper at a distance and which leaves open an annular gap, which can be more or less closed by adjustable deflecting plates, to the feed duct, and when, at the lower end of the annular space formed by the coarse-material collecting hopper and the jacket a spin-generating ring of regulating flaps is arranged.
REFERENCES:
patent: 1955960 (1934-04-01), Hirsch
patent: 1963469 (1934-06-01), Kuhr
patent: 2112359 (1938-03-01), Crites
patent: 2431746 (1947-12-01), Franggrist
patent: 2434037 (1948-01-01), Ebersole et al.
patent: 3511445 (1970-05-01), Ashdown
Bashore S. Leon
EVT Engergie-und Verfahrensteckhnik GmbH
Fournier, Jr. Arthur E.
Lithgow Thomas M.
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