National Power Supply, Thailand, expands renewable energy generation with Andritz recovery boiler

By processing black liquor, a residue from pulp production, the advanced recovery boiler will produce steam to generate green electricity for the mill and the public grid. The recovered chemicals will be reused in pulp production, supporting circular mill operations. Start-up of the recovery boiler and evaporation plant is scheduled for the second quarter of 2028.

Mr. Chainoi Puenkosoom, Board of Directors, at NPS said: “We are highly impressed with the solution Andritz presented to us. By implementing their technologies, our operations will benefit from a proven, reliable, and cost-effective solution for highly efficient renewable power production.”

The Andritz scope of supply comprises:

• A recovery boiler with a black liquor burning capacity of 3,300 metric tons of dry solids per day. Designed for long operating periods and high efficiency, it enables significant renewable energy production. The boiler includes an electrostatic precipitator for efficient flue gas cleaning as well as automation and digitalization solutions for optimized operation.
• An energy-efficient black liquor evaporation plant with a capacity of 727 t/h. The plant features easy-to-clean lamella heating surfaces, ensuring high availability, superior condensate for use in other mill departments, and easy operation. It is equipped with comprehensive automation and digitalization solutions.
• An integrated ash re-crystallization (ARC) system with a capacity to treat 220 t/d of ash from the electrostatic precipitator. The system reduces the ash’s chloride and potassium content while recovering sodium and sulfate for reuse in the process. Andritz ARC systems have been successfully implemented at several pulp mills in Asia.

NPS is a Thailand-based power generation company that produces electricity, renewable energy, and steam. The company is committed to clean energy use and environmentally friendly practices.