Double-liquid desulfurization and dust removal process for glass kiln flue gas

Abstract

The invention discloses a double-liquid desulfurization and dust removal process for glass kiln flue gas. The flue gas enters a desulfurizing tower from an inlet in the lower part of the tower, and SO2 absorption reaction and dust capture are performed with a desulfurizing solution in the desulfurizing tower. The process is characterized in that the partition recycling of the desulfurizing solution is that three spraying layers are arranged in the desulfurizing tower, wherein a spraying solution ejected from the upper layer and the bottom layer is an acidic desulfurizing solution of which the pH value is 5.0-5.5; and a spraying solution ejected from the intermediate layer is a desulfurizing solution of which the pH value is 8-9. After the three-layer spraying reaction is carried out, the spraying solutions and absorbed SO2 and dust are collected to the bottom of the desulfurizing tower and overflow into an ash water sedimentation tank, and clear liquid settled in the ash water sedimentation tank returns to the desulfurizing tower for recycling. With the adoption of the process disclosed by the invention, the desulfurization reaction efficiency is improved on the premise that no scaling is guaranteed, the desulfurization rate is up to 95 percent, and the amount of the desulfurizing solution and the amount of circulating water can be reduced.

Description

technical field [0001] The invention relates to a flue gas desulfurization treatment process, in particular to a glass kiln flue gas lime-gypsum double liquid desulfurization and dust removal process. Background technique [0002] At present, the desulfurization technologies commonly used in industrial boilers include double-alkali method and lime-gypsum method. The double-alkali method uses strong alkali sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO 3 ) as a desulfurization absorbent. The main features of this method are high desulfurization efficiency and not easy to scale, but the disadvantage is that the system is complicated and the operation cost is high, and the desulfurization agent is expensive. The lime-gypsum desulfurization process has a moderate operating cost, but because the generated desulfurization product calcium sulfite is easy to scale, it will easily cause the pipeline and nozzles to be blocked, which will affect the long-term stable operation of ...

AI Technical Summary

Problems solved by technology

[0002] At present, the desulfurization technologies commonly used in industrial boilers include double-alkali method and lime-gypsum method. The double-alkali method uses strong alkali sodium hydroxide (NaOH) or sodium bicarbonate (NaHCO 3 ) as a desulfurization absorbent, the main features of this method are high desulfurization efficiency and not easy to scale, but the disadvantage is that the system is complicated and the operation cost is high, and the desulfurization agent is expensive

The lime-gypsum desulfurization process has moderate operating costs, but the generated desulfurization product calcium sulfite is prone to scaling, which will easily block the delivery pipes and nozzles, affecting the long-term stable operation of desulfurization

Images