Removable mill throat and wear ring for pulverizer

Details Removable mill throat and wear ring for pulverizer Removable mill throat and wear ring for pulverizer

1990-01-02

1991-10-08

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Including means applying fluid to material

241119, B02C 1506

Patent

active

050546970

ABSTRACT:
A coal pulverizer, that supplies a coal-in-air mixture to combustion means for a power plant and comprises grinding means consisting of wheels revolving in a power driven trough from which pulverized coal is centrifugally thrust into a stream of forced air blown upward through air passages in a throat ring consisting of uniformly sized segments, is provided with a wear ring of uniformly sized segments resting flush on the throat ring segments of equal arcuate dimension. Each said wear ring has a substantially trapezoidal cross section, the base of which rests on a throat ring segment, the vertical face of which fits against the inner wall of the pulverizer and the sloping face of which rises upward from its base at an angle measured from the vertical of between ten and seventeen degrees for approximately 21/2 and 31/2 inches, so as to deflect the coal-air stream away from direct impingement on the pulverizer housing. The provision of wear-ring segments of arcuate dimension the same as that of the underlying throat ring segments serves in novel manner to permit replacement of worn throat ring segments without the necessity of removing the grinding means from the pulverizer.

REFERENCES:
patent: 4721258 (1988-01-01), Dougan et al.
patent: 4874135 (1989-10-01), Provost
patent: 4907751 (1990-03-01), Wark et al.

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