IMPROVED RECOVERY BOILER COOLING AND WASHING PRACTICES, 2017PEERS

A method employed by Valmet for bed cooling monitoring with thermocouples is presented. The rationale for selecting the number and the location of thermocouples as well as the conditions at which water washing can begin safely are reviewed. Cases are presented to demonstrate the general applicability.

Bed cooling monitoring is used routinely after smelt extractions, as the remnants of the bed cool down at best so quickly that washing can begin simultaneously in economizers, boiler bank and the superheaters. And since smelt extraction removes a major portion of the bed, cleaning the floor becomes much easier and can in many cases be carried out using a method based on enhanced dissolution of smelt and the salt falling from the superheaters. This method, named Wash-X, employs mixing devices installed on the furnace floor during washing. The benefits of the method are illustrated with a few case studies. 

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