Problem
A power plant’s coal-handling system starts with a reclaim conveyor under the stockpile and makes its way to the coal gallery. There, twelve conveyors distribute the coal to six different bunkers that feed the plant’s three coal-fired boilers. The plant suffered general dust, spillage, and carryback problems throughout the coal conveying system.
Solution
Martin Engineering personnel conducted a site survey. As a result of this survey, PG&E Corporation made a commitment to upgrade the entire coal handling facility with Martin® Secondary Belt Cleaners.
Results
To date, three transfer points in the coal gallery have been rebuilt, using proper belt support, wear liners, and improved skirtboard seals. In addition, the chutework on two conveyors has been redesigned. A standardized belt cleaning system has been installed on fourteen conveyors.
To provide consistent tensioning and minimize the amount of maintenance that the cleaners require, all belt cleaners have been installed with air tensioners, connected to the plant's air system. A specially-designed air bag tensioner for Martin® Secondary Cleaners was developed for this plant. Material spillage–particularly at the tail end of the conveyors–has been greatly reduced. The belt cleaning systems are doing their job. Plant management is satisfied with the upgrades.
