Improved crystallizer applicable to high-salinity wastewater quality grading crystallization

Abstract

The invention discloses an improved crystallizer applicable to high-salinity wastewater quality grading crystallization. The improved crystallizer comprises an outer tube and further comprises a flowguiding tube and a flow guiding baffle which are arranged in the outer tube; the flow guiding baffle is arranged at the bottom of the outer tube, and the flow guiding tube and the flow guiding baffleare both designed in an arc shape; the structure of a traditional crystallizer is improved, the structural design of the arc-shaped flow guiding tube is adopted, the flow field shearing effect in thecrystallizer is enhanced based on change of the sectional area of the fluid flowing direction, and then mixing of materials in the crystallizer is enhanced; and meanwhile, the flow guiding baffle which is designed in the arc shape is additionally mounted at the bottom of the crystallizer to enhance grading settlement of crystal particles, according to the particle settlement theory, the fine crystal particles flow back into the flow guiding tube together with fluids to continue to be circulated till growing up, the coarse crystal particles are settled into the bottom of the crystallizer, and thus the size of crystallized particle products is ensured. By enhancing the processes of fluid mixing and particle settlement in the crystallizer, the operating efficiency and fineness of the crystallizer are improved.

Description

technical field [0001] The invention relates to the technical field of crystallization and separation, in particular to an improved crystallizer suitable for fractional crystallization of high-salt wastewater. Background technique [0002] Crystallization is one of the most important unit operations in chemical separation engineering. It is widely used in industrial production processes. Especially in recent years, the development of near-zero discharge process for high-salt wastewater in coal chemical industry has put forward higher requirements for fractional crystallization technology and equipment. [0003] The high-salt wastewater of coal chemical industry is an inorganic-organic interactive system. Due to the existence of refractory organic pollutants, the inorganic salt products recovered by fractional crystallization often have the adhesion and entrainment of organic matter, and the product quality is difficult to guarantee. As the main equipment in the crystallizati...

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Problems solved by technology

But the guide tube and the bowl-shaped baffle in this crystallizer are just common trumpet-shaped and bowl-shaped designs, which are similar to the guide tube and the baffle in the traditional crystallizer, and the guide tube and the bowl-shaped baffle in the patent The inner surface is linear, and there is no velocity gradient in the flow direction, which does not completely solve the problem of material mixing and strengthening and crystal particle size control

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