Standardized complete process flow

Boiler/kiln flue gas → Pre-dust removal system → Pressurized fan → Desulfurization tower for pre-washing and cooling → Multi-stage sodium-alkali spray absorption of SO₂ + dust removal → Two-stage demisting and dehydration → Cleaned flue gas discharged through chimney

Rich liquid from the tower base → Regeneration slurry pump → Regeneration reaction tank (using lime milk to replace sodium hydroxide for regeneration) → Sloped tube sedimentation tank for solid-liquid separation

Top wash liquid (regenerated sodium alkali solution) → buffer tank → pumped back via a circulation pump to the desulfurization tower for continuous spray application

Slurry from the sedimentation tank → Slurry pump → Press filtration for dewatering → Dry sludge transportation; filtrate is recycled to the sedimentation tank.

The sodium-alkali tank automatically replenishes alkali to maintain the equilibrium of sodium-alkali concentration in the system.

Core advantages of the complete set of equipment for the double-alkali process:

1. No internal scaling or blockage in the tower: The absorption process utilizes only sodium hydroxide solution, with all calcium salts precipitating in the external sedimentation tank, significantly reducing the failure rate of pumps, pipelines, and spray nozzles while extending the operational maintenance cycle.

2. High desulfurization efficiency: Sodium-based alkali solution dissolves rapidly, achieving compliance requirements with a low liquid-to-gas ratio, making it suitable for high-sulfur flue gases, coal powder furnaces, brick kilns, and smelting furnaces.

3. Low consumable costs: Only a small amount of sodium hydroxide is required for supplementation, with the primary consumption being inexpensive quicklime; the operating chemical costs are significantly lower than those of the single-sodium hydroxide method.

4. Integrated desulfurization and dust removal: The spray system simultaneously captures flue gas dust, eliminating the need for subsequent wet scrubbing equipment.

5. Integrated Automation System: The complete system for dust removal, desulfurization, chemical dosing, regeneration, and electrical control is manufactured as a single unit; only water supply, electricity connection, and flue duct installation are required before commissioning, with a short construction period.

6. Short by-products can be utilized as resources: Forced oxidation produces dihydrate gypsum, which can be used in construction materials and road subgrade backfilling.

Applicable operating scenarios

Industrial boilers; Industrial kilns; Incinerators