Purification device and purification method of organic amine desulfurizing agent in organic amine method desulfurizing process

Abstract

The invention discloses a purification device and a purification method of an organic amine desulfurizing agent in an organic amine method desulfurizing process. A regenerated desulfurizing agent solution is subjected to heat exchange through a plate heat exchanger, and is then pumped into a safety filter by a pressurizing pump to be filtered; obtained filter liquid enters a nanofiltration device; filter liquid obtained after the nanofiltration is discharged into a filter liquid groove; concentrated liquid obtained through nanofiltration is discharged into a solution storage groove; the purification device also comprises a freeze crystallization system connected with the plate heat exchanger; partial solution subjected to heat exchange is subjected to freeze crystallization to remove sodium sulphate; then, the regenerated desulfurizing agent solution subjected to the sodium sulphate removal is guided into the plate heat exchanger to be subjected to heat exchange again; next, obtained liquid and the regenerated desulfurizing agent solution in a pipeline are jointly pumped into the safety filter by the pressurizing pump to be filtered; the nanofiltration device is connected with a cleaning system and a reverse flushing system. The content of Cl<-> and SO4<2-> in the regenerated desulfurizing agent solution can be continuously reduced; the cleanness of the desulfurizing agent of the desulfurizing system and the stability of the desulfurizing effect can be ensured.

Description

technical field [0001] The invention relates to the purification and desalination of the desulfurization agent of the sintering flue gas organic amine wet desulfurization system, more specifically, the invention relates to a purification device and purification method of the organic amine desulfurization agent in the organic amine desulfurization process. Background technique [0002] Panzhihua Iron and Steel No. 3 sintering flue gas desulfurization adopts organic amine technology. During the operation of the desulfurization system, due to the desulfurization agent circulation absorption and desorption, the Cl in the flue gas - and SO 2 Oxidation of the desulfurization agent leads to the accumulation of acid radical ions in the desulfurization agent, which greatly affects the S absorption effect of the desulfurization agent and reduces the desulfurization efficiency. The ion exchange resin desalination method is adopted on site. - , SO 4 2- Ions can be removed to a certai...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiency that existing organic amine desulfurizers have poor purification effect, especially for the desulfuri

Images