To provide an air seal assembly for sealing the vicinity of a vertical pulverizer york.

The yoke air seal assembly 100 for sealing the vertical pulverizer yoke includes a yoke seal housing ring 102 having a plurality of circumferential segments 104 mounted together end to end in a ring. A seal ring 106, 118 is mounted radially inside the housing ring 102. The seal ring 106, 118 has a radially inner surface having a plurality of grooves defined therein for forming a labyrinthine air seal against the pulverizer yoke. The seal ring 106, 118 can be segmented into a plurality of circumferential seal ring segments 122. The segmented ring configuration facilitates installation and replacement of yoke seal components, increases operational lifetime thereof, and reduces down time for such installation and replacement.