Method for distributing chemicals in delignification stages of pulp bleaching process

A system, comprising:

• one or more memory devices storing instructions;
• and
• one or more data processing apparatus that are configured to interact with the one or more memory devices, and upon execution of the instructions, perform operations including:
• obtaining (1) an incoming kappa value that represents a lignin content of an unbleached pulp slurry and (2) a target kappa value that represents an expected lignin content of a bleached pulp slurry;
• generating, using a model, a sequence kappa factor corresponding to the incoming kappa value and the target kappa value, wherein the model maintains a relationship between a plurality of kappa factors and a plurality incoming and target kappa values;
• generating, by the model, a total equivalent chlorine (TEC) factor according to the sequence kappa factor and the incoming kappa value;
• simulating, using the TEC factor, a plurality of scenarios, wherein each scenario in the plurality of scenarios specifies a unique distribution of dosage targets for a plurality of oxidizing agents used during a pulp bleaching cycle;
• determining, for each scenario and based on the dosage targets for the plurality oxidizing agents corresponding to the scenario, a total consumption score for the plurality of oxidizing agents;
• selecting, from among the plurality of simulated scenarios and based on the total consumption score determined for the plurality of simulated scenarios, a scenario with a lowest total consumption score;
• and
• applying, by the model, the dosage targets of the plurality of oxidizing agents for the selected scenario during the pulp bleaching cycle.

A non-transitory computer readable medium storing instructions that, when executed by one or more data processing apparatus, cause the one or more data processing apparatus to perform operations comprising:

• obtaining (1) an incoming kappa value that represents a lignin content of an unbleached pulp slurry and (2) a target kappa value that represents an expected lignin content of a bleached pulp slurry;
• generating, using a model, a sequence kappa factor corresponding to the incoming kappa value and the target kappa value, wherein the model maintains a relationship between a plurality of kappa factors and a plurality incoming and target kappa values;
• generating, by the model, a total equivalent chlorine (TEC) factor according to the sequence kappa factor and the incoming kappa value;
• simulating, using the TEC factor, a plurality of scenarios, wherein each scenario in the plurality of scenarios specifies a unique distribution of dosage targets for a plurality of oxidizing agents used during a pulp bleaching cycle;
• determining, for each scenario and based on the dosage targets for the plurality oxidizing agents corresponding to the scenario, a total consumption score for the plurality of oxidizing agents;
• selecting, from among the plurality of simulated scenarios and based on the total consumption score determined for the plurality of simulated scenarios, a scenario with a lowest total consumption score;
• and
• applying, by the model, the dosage targets of the plurality of oxidizing agents for the selected scenario during the pulp bleaching cycle.