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Understanding the Energy and Emission Implications of New Technologies in a Kraft Mill: Insights from a CADSIM Plus Simulation Model, 2023 PEERS Conference

The solubility of calcium carbonate in green liquor handling systems, TAPPI Journal October 2019

ABSTRACT: The formation of hard calcite (CaCO3) scale in green liquor handling systems is a persistent problem in many kraft pulp mills. CaCO3 precipitates when its concentration in the green liquor exceeds its solubility. While the solubility of CaCO3 in water is well known, it is not so in the highly alkaline green liquor environment. A systematic study was conducted to determine the solubility of CaCO3 in green liquor as a function of temperature, total titratable alkali (TTA), causticity, and sulfidity. The results show that the solubility increases with increased temperature, increased TTA, decreased causticity, and decreased sulfidity. The new solubility data was incorporated into OLI (a thermodynamic simulation program for aqueous salt systems) to generate a series of CaCO3 solubility curves for various green liquor conditions. The results help explain how calcite scale forms in green liquor handling systems.

CAUSES OF POOR DREGS SETTLING IN A GREEN LIQUOR CLARIFIER, 19PEERS

CAUSES OF POOR DREGS SETTLING IN A GREEN LIQUOR CLARIFIER, 19PEERS

COMBATTING LIME KILN RINGING PROBLEMS AT THE ARAUCO CONSTITUCIÓN MILL, 19PEERS

COMBATTING LIME KILN RINGING PROBLEMS AT THE ARAUCO CONSTITUCIÓN MILL, 19PEERS

Role of Technology in Conservation and Sustainability, 2000 Environmental Conference Proceedings

Role of Technology in Conservation and Sustainability, 2000 Environmental Conference Proceedings

Weathering a Tough Economy, 2008 Engineering, Pulping and Environmental Conference

Weathering a Tough Economy, 2008 Engineering, Pulping and Environmental Conference

High Energy Piping Evaluation, 2008 Engineering, Pulping and Environmental Conference

High Energy Piping Evaluation, 2008 Engineering, Pulping and Environmental Conference

Oxygen Delignification at Evergreen Pulp, Inc. Samoa, California, 2008 Engineering, Pulping and Environmental Conference

Oxygen Delignification at Evergreen Pulp, Inc. Samoa, California, 2008 Engineering, Pulping and Environmental Conference

Examining upgrade options when rotary kiln tires are mounted on the kiln shell with no filler bars, 19PEERS

Examining upgrade options when rotary kiln tires are mounted on the kiln shell with no filler bars, 19PEERS

Case study: Paper mill power plant optimization—balancing steam venting with mill demand, TAPPI Journal June 2020

ABSTRACT: Most Power departments are tasked with generating steam to support mill wide operations, generate electricity, and reduce operating costs. To accomplish these tasks, power boilers generate high pressure steam that is reduced to intermediate and low pressures for process utilization in the mill by means of steam turbine generator extraction or pressure reducing valves. The most economical method to reduce steam pressure is the use of steam turbine generators, as electricity is generated from the steam when it is reduced in pressure. Electricity that is produced by these generators provides a substantial financial benefit and helps offset overall operational costs. To achieve tangible financial gains, the mill must evaluate the overall cost of steam production and the price of electricity.The current work provides a case study of power plant optimization that evaluated electricity production and steam production costs balanced with mill steam demand. Process and cost optimization led to a significant reduc-tion in low pressure steam venting, resulting in reduced fuel consumption and reduced operating cost.