Dual-Alkali Desulfurization

The dual-alkali method (NaOH/Ca(OH)2) utilizes the high solubility of sodium salts in water. Sodium alkali is used inside the absorption tower to absorb sulfur dioxide. The desulfurization solution is then regenerated in a regeneration tank using inexpensive lime, allowing for the recycling of sodium ions. This process combines the advantages of the lime method and the sodium alkali method, solving the scaling problem in the lime method tower while retaining the high absorption efficiency of the sodium alkali method.

Currently, wet desulfurization technology is widely used, accounting for over 90% of all FGD (Fulfilled Gas Desulfurization) plants worldwide. Among them, the dual-alkali method is widely used in my country due to its simple process, good operational stability, high desulfurization efficiency, and low cost, making it suitable for my country's national conditions.