A REVIEW OF UNIVERSITY OF TORONTO RESEARCH ON DEPOSIT REMOVAL IN RECOVERY BOILERS, 2015 PEERS Conference

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This paper summarizes research on deposit removal in recovery boilers conducted at the University of Toronto Pulp & Paper Centre over the past 25 years. Highlights of the research program include: the development of fully expanded sootblower nozzles, that maximize the cleaning power that can be produced; a study of deposit tensile strength versus adhesion strength as a function of temperature and position in a boiler, and the development of models of deposit removal by brittle fracture and by debonding, all of which lead to the conclusion that debonding is likely the dominant mechanism of removal in locations of a boiler where hard deposits exist or dust sintering occurs; a series of field studies where in-situ measurements were taken of actual sootblower force, to provide full scale data against which to compare lab experiments and CFD simulations of sootblowing; and finally, a feasibility study of low pressure sootblowing, and the idea that less expensive medium pressure steam can be used to produce the same sootblower jet force as a high pressure steam jet.