Online Alkali Measurements for Optimized Pulp Cooking
Online Alkali Information of Pulp Cooking Produces Homogenous Product
Control of the make-up cooking liquor, as well as initial and resulting alkali concentration, affects the uniformity of pulp produced. During the cooking process, residual alkali strength fluctuates with changes in chip composition due to wood species, moisture, and concentration of make-up chemicals.
Measurement of effective alkali concentration inside the digester has never been done before. The present methods require a filtered side stream which add delay and error. Savcor, together with Andritz has utilized its long experience in electrochemical measurements inside the digesters and developed an accurate in-situ alkali measurement.
By placing several sensors inside the digester it is possible to create an alkali profile which indicates how the liquors (and chips) are moving inside the digester and how the cooking process is developing within time.