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My TAPPI Story: Dave Maddux
A number of black liquor recovery boilers in North America have experienced severe, localized cracking in the coextruded 304L stainless steel/SA210 carbon steel tubes at or near the bottom of primary air ports. Some of these cracks have been found to advance into the carbon steel. Studies have shown that excessive temperature fluctuations on the surface of the tubes are common to all tubes that experience this cracking. This project has addressed this problem by identifying 1) changes in the alloy used for the cladding on the composite tubes to reduce the likelihood of cracking, 2) changes in the design of the primary air port to one that appears to reduce crack frequency, and 3) process changes that can reduce the magnitude and frequency of the temperature fluctuations. This paper utilizes the information obtained from this study to address questions regarding the nature of the cracking, the cracking mechanism, prevention of cracks advancing into the carbon steel and complete avoidance of any cracking.
Experience the Power of Publications in the 2024 TAPPI Press Catalog
Sponsored by the Recovery Boiler Program R&D Subcommittee of the American Forest & Paper Association (AF&PA) and published by TAPPI Press.
The best-selling text to introduce the entire technology of pulp and paper manufacture.
A project of the Yankee Dryer Safety & Reliability Committee.
TAPPI Press offers some of the most in-depth resources and references for the forest products and related industries.
Available for Purchase – Conference Proceedings
TAPPI maintains a record of key conference papers, presentations, and other conference publications, available for purchase in a variety of formats.