Continuous discharge device of evaporation and crystallization equipment

Abstract

The invention discloses a continuous discharge device of evaporation and crystallization equipment. The continuous discharge device comprises an evaporator and a crystallizerwhich are connected to each other. The bottom of the evaporator is provided with a central circulation pipe extending into the crystallizer; the bottom of the crystallizer is provided with an elutriation leg; the elutriation leg is provided with a discharge opening; a rotating shaft is disposed in the central circulation pipe; the top of the rotating shaft is connected to a power device installed at the top of the evaporator; and the bottom of the rotating shaft is fixedly connected to a spiral plate in the elutriation leg. The continuous discharge device of the evaporation and crystallization equipment solves the difficult problem of discharge opening blockage due to high solid content in a crystallization system that troubles the industry for a long time thoroughly.

Description

technical field [0001] The invention relates to a component of evaporation and separation equipment, in particular to a continuous discharge device for evaporation and crystallization equipment. Background technique [0002] For the thermal crystallization process used in evaporative crystallization, the applicant has previously proposed an integrated evaporative crystallization equipment ZL201320200081.2 as figure 1 As shown, through the integrated design of the evaporator and the crystallizer, the material enters the evaporator 1 after evaporation and concentration, and the secondary steam is discharged from the top exhaust port to the next effect body after flash evaporation, while the material passes through the central circulation pipe 3 Enter the bottom of the crystallizer 2, the large crystals sink to the bottom of the cone, the fine crystals rise slowly, grow up and then sink to the bottom of the crystallizer 2, the supernatant of the upper part of the crystallizer 2...

AI Technical Summary

Problems solved by technology

Since the crystal content of the material discharged from the crystallizer has accounted for more than 70%, the crystal part will continue to precipitate at the bottom of the crystallizer with the reaction. Long-term high-concentration operation will easily cause crystal hardening, making it very difficult to discharge the material or even block the discharge port. It is necessary to stop the machine regularly for cleaning or reduce the reaction concentration to wash out the crystals at the discharge port. There is an urgent need for a continuous discharge device capable of long-term high-concentration operation.

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