Investigation of Chemical Recovery Unit Floor Tube Overheat Failures, 1997 Engineering Conference Proceedings
The kraft pulping industry has in recent years noted a trend toward increased damage and/or failure of chemical recovery unit (CRU) floor tubes due to overheating. 1,4,5 This trend has not been limited to CRU floor designs of any particular boiler manufacturer. Overheating failures on three Combustion Engineering, Inc. (ABB C-E) units were the result of localized disturbances within the normally stable frozen smelt layer that overlies the floor tubes. Disturbing this protective layer permitted molten smelt to come within close proximity to, and possibly in direct contact with. the floor tubes. This paper describes the three incidents, testing and conclusions reached (to date) by ABB C-E Services, Inc., and subsequent improvements in CRU floor protection.
Investigation of Chemical Recovery Unit Floor Tube Overheat Failures, 1997 Engineering Conference Pr
