Sodium-salt wastewater treatment device for desulfurization system

Abstract

The invention relates to a treatment device for sodium-salt wastewater in a desulfurization system, which is a device for further removing the by-product sodium sulfate produced in the sodium-alkali desulfurization system. It consists of a pretreatment filter, a preheater, a double-effect evaporation crystallizer, Crystallization dryer, cyclone separator, negative pressure generator, etc. Using low-temperature vacuum technology to evaporate sodium-salt wastewater at a lower temperature, using negative pressure evaporation technology to make sodium-salt wastewater reach boiling at a lower temperature, coupled with the integration of internal heat forced circulation technology, The heat loss in the whole evaporation process is minimized, and the evaporation efficiency is maximized. The treated water is distilled water with high purity, which can be completely returned to the process water pipeline for utilization, effectively utilizing resources.

Description

technical field [0001] The invention relates to a treatment device for sodium-salt wastewater used in a desulfurization system in the field of environmental protection, and in particular to a treatment device for sodium-salt wastewater in a desulfurization system that further removes the by-product sodium sulfate generated in a sodium-alkali desulfurization system device. Background technique [0002] At present, there are dozens of flue gas desulfurization technologies. According to whether water is added to the desulfurization process and the dry and wet form of the desulfurization product, flue gas desulfurization is divided into three categories: wet, semi-dry, and dry desulfurization processes. Wet desulfurization technology is relatively mature, with high efficiency and simple operation. The traditional limestone / lime-gypsum flue gas desulfurization process uses calcium-based desulfurizers to absorb sulfur dioxide to form calcium sulfite and calcium sulfate. Due to th...

AI Technical Summary

Problems solved by technology

However, in the actual operation process, since the main by-product produced in the sodium-alkali desulfurization system is sodium sulfate, the chemical properties of sodium sulfate are relatively stable, and it cannot be decomposed and effectively settled by chemical methods, resulting in the process slurry of the desulfurization system There are more and more sodium sulfate in the desulfurization system, which affects the desulfurization process effect of the desulfurization system, so the waste water needs to be discharged to the waste water station for treatment

Due to the particularity of this kind of wastewater, the wastewater station usually adds a large amount of reclaimed water to dilute it. After the dilution reaches the discharge standard, it is discharged to the river or underground, which will have a certain impact on the environment, and the cost of dilution is also quite large. The cost of dilution per ton of water can be as high as several thousand yuan, causing certain waste to enterprises and the country

Images