Paper Mill Boiler Chemical Cleaning – Why, When and How, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

A Pulp and Paper Mill’s operation requires its boilers operate reliably and efficiently. Excess deposits within boiler tubes can cause failures of the tubes, which not only result in lost production, but can also place mill personnel and equipment at risk of injury and damage, particularly in the case of a chemical recovery boiler.

This paper addresses how deposits and their thicknesses, densities and compositions effect boiler reliability and efficiency. Methods to measure deposit thickness, density, and composition using ultrasonic and tube sampling techniques are discussed.

Methods to remove deposits are described, therefore prevent tube failure and increase heat transfer efficiency. For large boilers, the removal of deposits by chemical means during an outage has been proven to be the most effective and efficient method. The steps required to plan and execute a boiler chemical cleaning program are discussed in detail. How to choose the chemicals to use based on the nature of the deposit will also be discussed. Effective chemical cleaning methodologies designed to provide the shortest outage duration are described for various boiler configurations. The means to minimize and/or eliminate hazard exposure to personnel and the environment are presented.

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