REMOVAL OF FOULING DEPOSITS IN KRAFT RECOVERY BOILERS BY THERMAL SHEDDING

Data collected with an on-line Fouling Monitoring System indicates tha t thermal shocks can be used to shed inorganic deposits and reduce fou ling in the superheater sections of a recovery boiler. Unless the shoc k is rapid and prolonged (>6 hours), however, it will have little effe ct on the degree of fouling in the generating bank or economizer. Whil e the benefits of a thermal shock are short-lived (typically lasting l ess than a week), the additional electricity produced as a result of h igher steam temperatures can have substantial economic value.