EVALUATION OF BOILER PARTIAL HOPPER EVACUATION SYSTEM AT PLEYSTOWE MILL

A PARTIAL hopper evacuation system was evaluated on Pleystowe Mill No.2 boiler in the 2006 season. With positive results, a full hopper evacuation system was retrofitted to Pleystowe Mill’s No.2 boiler in time for the 2007 crush season. Results in the 2007 season were positive. The fully installed system included evenly distributed air extraction from a dry multi-cyclone dust collector, ducting extracted flue gas to a small wet scrubber, extraction fan, and return flue gas ducting. This paper addresses the genesis, design philosophy, and implementation of this installation and proposes that for other boilers, similar retrofit installations could achieve reductions in emissions without a full wet scrubber installation.