Roller mill

Details Roller mill Roller mill

1992-01-21

1993-10-12

Yost, Frank T.

Solid material comminution or disintegration

Apparatus

With separation or classification of material

241 80, 241117, 209139001, B02C 2308

Patent

active

052518310

ABSTRACT:
Raw coal is caused to fall through a coal feed pipe and onto a table so as to be pulverized by a roll. Fine coal particles and coarse coal particles resulting from pulverization are moved upward between an auxiliary classifier cone and a mill casing by hot air supplied from below the mill casing. The hot air (upward stream) carrying the fine coal particles and the coarse coal particles moves across a space of triangular cross section formed between the inverted conical body of the auxiliary classifier cone and the side wall of the mill casing and is forced through blowoff openings defined between deflector plates so as to flow as a lateral rotative stream toward a rotary classifier. Upon impinging the downward-inclined rotating vanes of the rotary classifier, the coarse coal particles are sprung back toward a lower portion of the auxiliary classifier cone and are separated from the fine coal particles. The fine coal particles separated from the coarse coal particles are ejected out of the roller mill together with the upward air stream through a pulverized-coal eject pipe. Coarse coal particles sprung back toward the lower portion of the auxiliary classifier cone move along the inner surface of the auxiliary classifier cone and fall onto the table so that they are re-pulverized by the roll.

REFERENCES:
patent: 1702248 (1929-02-01), Crites
patent: 4235385 (1980-11-01), Brundiek
patent: 4260478 (1981-04-01), Hosokawa et al.
patent: 4684069 (1987-08-01), Hashimoto et al.
patent: 4919341 (1990-04-01), Lohnherr

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