Chemical Additives to Optimize Black Liquor Recovery Throughput and Increase Campaign Life, 2015 PEERS Conference

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During normal operation, large deposits can accumulate on heat transfer surfaces of black liquor recovery boilers.  These accumulations can result in reduced solids throughput and result in unscheduled outages due to plugging of flue gas passages.  Sootblowing and chill and blows can help with deposit removal; however, over time deposits can sinter and become resistant to sootblowing; chill and blows become increasingly ineffective, and ultimately the boiler plugs.  Owing to growing demand for kraft pulp, black liquor recovery boilers are often pushed to maximize liquor throughput.  As such, recovery boiler operators are challenged to extend campaign life in the face of higher solids throughput.  Increased throughput of black liquor solids results in increased carryover, fuming, higher furnace exit gas temperatures, and increased deposition of inorganic salts on heat transfer surfaces, often resulting in rapid deposit growth and plugging.  

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Author: Ian Saratovsky, Christopher Smyrniotis, Heng Wang, and Scott Bohlen
Chemical Additives to Optimize Black Liquor Recovery Through
Chemical Additives to Optimize Black Liquor Recovery Throughput and Increase Campaign Life, 2015 PEERS Conference

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