Navigator Cacia Optimizes Causticizing Process Targets, Paper360º March/April 2019

Online liquor analysis and advanced controls stabilized the liquor conversion chain and increased white liquor active alkali by 3 percent; extra process visibility led to further improvements.

Online analyzers and advanced process controls (APCs) have combined to establish stability in pulping and recovery cycle operations which, in turn, have allowed favorable shifting of operating targets, promoting higher quality and productivity and lower material and energy consumption. However, as a secondary benefit, these fast-responding and very visible measurements and controls have been valuable diagnostics tools, uncovering previously unseen process instabilities and limitations. The previous veil over the process has been lifted. With this visible information, mill engineers and vendors have been working together to solve these problems and provide additional benefits.

This has been the case at the Navigator Company’s Cacia mill in Portugal, which has an annual output of about 370,000 tons of bleached eucalyptus pulp, intended for processing into specialty papers such as high quality décor, filter, cigarette, and tissue paper. Earlier in 2018, Valmet commissioned a multi-point online Recovery Liquor Analyzer and Causticizing Optimizer APC in the causticizing plant. The controls and operator interface are based on Valmet DNA linked to an existing DCS.

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