Primary air duct cleaning apparatus for recovery boilers
AssigneeCombustion Engineering, Inc.
InventorRobert T. Smuda
Life of this patent
Estimating the term…
Abstract
A primary air duct for a chemical recovery furnace is rectangular in cross section. Smelt accumulates on the walls of the air duct at the furnace end. A scraper structure is comprised of a pair of C-channels hinged together at one end. A mechanism moves the hinged scraper forward so it can be guided into scraping contact with the duct walls. The edges of the C-channels are guided by pin and groove engagement between the channels and the duct walls. The scraper is reciprocated from an inoperative position to a scraping mode by a rod to which force is applied.
Claims2
A scraper for removal of solidified layers of smelt on the furnace end of primary air ducts of rectangular cross section, including,
- a pair of C-channel members having sharp edges and mounted in the air duct to initially extend substantially parallel to the longitudinal axis of the duct,
- a pivot pin connecting the C-channel members at their upstream ends and extending transverse the duct,
- guide pins mounted to extend from the outside surface of the C-channel members and extending transverse the duct,
- a push-pull link attached to the pivot pin with which to reciprocate the C-channel members of the scraper along the air duct, and
- grooves formed in the side walls of the duct and engaged by the guide pins and pivot pin to bring the sharp edges of the C-channel members of the scraper into contact with the sides of the duct to remove the solid smelt into the furnace.
Dependencies are inferred from the claim text.