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...

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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 desulfurization of Cl in organic amine desulfurization liquid. - and SO 4 2- to provide a purification device and method with good removal effect and less desulfurization agent loss

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