Ten Year Experience with Sustainable Composite Tubes in SCA High Efficiency Recovery Boiler in Östrand Sweden, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

The Black Liquor Recovery Boiler at SCA Östrand mill in Sweden was started up in October 2006. It was the first recovery boiler outside Japan with a steam outlet temperature of 515 °C. The boiler is operating with 515 °C/106 bar steam data with a design capacity of boiler 3300 tds/d. An upgrading project has just started (2016) to raise the capacity of the boiler up to 5 000 tds/d (2018). Since this boiler was the first 515 °C recovery boiler, it was designed with a lot of composite tubes - about 31 km in total. The entire floor and furnace walls above the primary airports are made of Sanicro 38/SA210A1 composite tubes. Furnace walls from the primary airport level up to about 30 m height are made of 304L/SA210A1 composite tubes. In addition, some 13 km of Sanicro28/SA213T91&T22 composite tubes were used in the most exposed areas in the superheaters. The expansion from 3300 to 5000tds/d will add another 9 km of composite tubes in the boiler, to bring the total to > 40km. The experience with composite tubes after 10 years of successful operation in this boiler is presented in this paper. Measured material losses in different positions are discussed.  A comprehensive material evaluation and comparison is made regarding the lower alloyed superheater tubes 16Mo3, (a low alloyed grade similar to T1) T22 and T91. Finally, an estimation of expected service lifetimes is made for the applied composite tubing. 

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