Double-Alkali Desulfurization System with Sodium Hydroxide and Lime in Single Circulating Water Tank Hard for Secondary Recycling

The double-alkali desulfurization technique utilizes sodium hydroxide (NaOH) and lime (calcium hydroxide) as two distinct alkaline desulfurizing agents in a sophisticated purification process.

This process typically employs a single circulating water tank where sodium hydroxide, lime, and captured soot from dust removal and desulfurization procedures are thoroughly mixed together.

During the cleaning of ash residues from the circulating tank, the following materials are collectively discharged:

• Soot and particulate matter
• Reaction by-products including calcium sulfite and calcium sulfate
• Lime residues and incompletely reacted lime

The discharged waste residue exists as a complex mixture, presenting challenges for secondary recycling and reutilization.