analysis and simulation of k and cl in electrostatic precipitator ash and black liquor of an operating kraft recovery boiler
abstract
non-process elements such as potassium (k) and chlorine (cl) are commonly found in the
recovery cycle of kraft mills and are capable of forming highly soluble compounds. these
elements, in high concentrations, can lead to the corrosion of process equipment or to the plugging
of recovery boilers. the behaviour of these elements throughout the liquor cycle is often a direct
result of variables related to the operation of the process. an unusual cyclical trend was observed
in the cl content of the electrostatic precipitator (esp) ash produced in the recovery boiler of a
canadian kraft mill. analysis of the ash and liquor samples during a 390-day sampling period
found that the cl enrichment factor (efcl) varied significantly between 1.2 to 3.9, whereas the efk
stayed fairly constant at ~ 1.4. [...]