MVR crystallization salification grain control system and control method

Abstract

The invention provides an MVR crystallization salification grain control system and a control method. The system comprises a forced circulation pump, a crystallizer discharging pump, an elutriation circulating pump, a control system, a forced circulation heat exchanger, an Oslo crystallizer and an elutriation separator, wherein a circulating liquid outlet is connected with a heat exchange inlet, aheat exchange outlet is connected with a circulating liquid inlet, a crystallization material liquid outlet is connected with a crystallization material liquid inlet through the crystallizer discharging pump, an elutriation clear liquid outlet is connected with a elutriation clear liquid inlet, a mother solution outlet is further connected to a connecting pipeline of a circulating liquid outlet and the forced circulation pump and is connected with a mother solution inlet through the elutriation circulating pump, and the control system is connected with the forced circulation pump, the crystallizer discharging pump and the elutriation circulating pump, respectively. The crystallizer is of an Oslo structure, the elutriation separator is additionally arranged, and the grains are primarily screened in the crystallizer and are further elutriated and screened by virtue of the elutriation separator, so that the quality of the product is guaranteed.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to an MVR crystallization salt grain control system and a control method. Background technique [0002] Crystallization refers to the process in which a solute is automatically precipitated from a supersaturated solution to form a crystal. The crystallization process depends on the solubility of the crystalline substance. When a solution contains a solute content that exceeds the solubility, it is called a supersaturated solution, and supersaturation is the main driving force for the crystallization process. [0003] The main process of crystallization is the nucleation and growth of crystal nuclei, which are the core of crystal growth. The source of crystal nuclei is formed from the supersaturated solution. We call this nucleation process primary nucleation. The formation of primary nucleation is the tiny crystal particles newly generated from a higher supersaturated so...

AI Technical Summary

Problems solved by technology

This will lead to excessive supersaturation, exceeding the limit of the metastable zone, resulting in excessive generation of crystal nuclei, resulting in increased friction between crystal grains and circulating pumps, heating pipes and circulating pipe walls, and more chances of collisions between crystals, thus Produce more secondary crystal nucleus products with too small particle size

The traditional evaporative crystallizer cannot effectively control the grain concentration and cannot screen out the appropriate grain size range

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