Device for refining RO concentrated water into crystal mush to realize zero discharge of wet desulphurization wastewater

Abstract

The invention relates to a device for refining RO concentrated water into crystal mush to realize zero discharge of wet desulphurization wastewater. According to the invention, an atomization sprayinglayer is arranged at the upper part of a separation cylinder, and an inlet of the atomization spraying layer is externally connected with an RO concentrated water inlet channel; a spiral venturi device is arranged in the middle of the separation cylinder; a suction pipe extends out of the separation cylinder and is communicated with the lower end of a heating cylinder; the upper end of the heating cylinder is tangentially communicated with the separation cylinder through a tangent connecting pipe; a high-temperature steam inlet is formed in the upper part of the heating cylinder; and a steamdischarge passage is connected with a steam outlet in the top of the separation cylinder and is divided into two paths which are respectively wound and fixed on the heating cylinder and the suction pipe, and the two paths are respectively provided with a condensed water outlet. According to the invention, atomization spraying, the spiral venturi tube, an extension tube of the spiral venturi tube and a special-shaped agitator are ingeniously designed, and steam leaving the separation cylinder exchanges heat with a forced liquid circulation channel, so steam condensation can be accelerated, andenergy efficiency can be improved.

Description

technical field [0001] The invention relates to an industrial salt purification and refining crystal slurry device, in particular to a waste salt purification and refining crystal slurry device used for zero discharge of desulfurization wastewater. Background technique [0002] Limestone / lime-gypsum desulfurization is a widely used desulfurization method with high efficiency, reliability, stability, safety and low operating cost. It has long been the most important method for flue gas desulfurization of thermal power coal-fired boilers. However, this method has a large wastewater treatment problem. Wastewater produced by desulfurization contains a large amount of chloride ions, sulfate radicals, calcium, magnesium and other ions. The water quality of the wastewater is complex, mainly containing suspended solids, sulfates, supersaturated sulfites, and heavy metals. Many of them are strict in the national environmental protection standards. The first category of pollutants re...

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Problems solved by technology

For the pretreatment and concentration of desulfurization wastewater, usually, one or several technologies are used in combination to obtain concentrated RO waste liquid. There is no particularly suitable device for the crystallization of concentrated RO waste liquid, and vacuum series in the food or pharmaceutical industry are mostly used. Due to the low saturation of NaCl content, the crystallization particle size cannot be controlled, often the mother liquor is too much, the concentration is not enough, the cost is expensive and it is not suitable, and the difficulty of subsequent treatment process is increased, which cannot be converted into reasonable economic benefits.

[0004] In the prior art, according to the composition characteristics of desulfurization wastewater, through the pre-stage softening device and RO concentration, the main component is NaCl impurity solution with low saturation, which can meet the crystallization requirements without a high-precision vacuum environment. In addition, due to The dust filtration at the flue gas inlet may be poor, resulting in high dust concentration at the inlet, high tar or asphalt dust, resulting in the ineffective crystallization of the RO concentrated liquid, the phenomenon of mother liquor passing through, and often the phenomenon of precipitation and adhesion at the bottom of the reaction kettle.

This kind of low-quality crystal slurry cannot meet the requirements of the lower process of zero discharge of wastewater. On the one hand, it increases the difficulty of treatment, and on the other hand, it increases the overall energy consumption.

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