High-temperature continuous evaporative crystallization equipment and crystallization process thereof

Abstract

The invention discloses high-temperature continuous evaporative crystallization equipment which comprises a high-temperature evaporator, a steam compressor connected with the high-temperature evaporator through a first pipeline and a high-temperature crystallizer connected with the steam compressor in parallel through a second pipeline. The high-temperature evaporator comprises a heat exchange cavity and an evaporation cavity. The steam compressor communicates with a first steam inlet and a first steam outlet in the heat exchange cavity and the evaporation cavity through the two ends of a first pipeline correspondingly. The high-temperature crystallizer comprises a crystallization cavity, a heating device and a stirring device; a concentrated solution formed by heating and evaporating in the heat exchange cavity is conveyed to the crystallization cavity; and the steam compressor is respectively communicated with the heating device and a second steam inlet and a second steam outlet on the crystallization cavity through two ends of a second pipeline. According to the equipment, on the basis of not changing parts of the MVR high-temperature evaporation system and not increasing new parts, the high-temperature crystallizer is connected with the MVR high-temperature evaporation system in parallel, so that the advantages of large treatment capacity and low energy consumption in the MVR high-temperature evaporation system are reserved, and meanwhile, the crystallization of a concentrated solution is realized.

Description

technical field [0001] The invention relates to the technical field of fluid crystallization, in particular to a high-temperature continuous evaporation crystallization device and a crystallization process thereof. Background technique [0002] At present, in the manufacturing process of sewage treatment, chemical industry, pharmaceutical, paper making, salt making and other industries, many fluids need to be evaporated, concentrated and crystallized. The concentration and crystallization of fluids are mostly realized by industrial steam or electric heating. The traditional evaporation and crystallization methods consume high energy consumption and high production costs. [0003] The MVR high-temperature evaporation system in the prior art mainly includes: a high-temperature evaporator and a steam compressor connected to the high-temperature evaporator. The high-temperature evaporation temperature is between 85°C and 100°C, and has the advantages of large processing volume a...

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Problems solved by technology

However, in the MVR high temperature evaporation system, with the concentration of the fluid during the fluid evaporation process, the amount of steam generated becomes smaller, which cannot meet the normal operating conditions of the steam compressor, and thus cannot realize the crystallization process of the concentrated liquid.

[0004] The low-temperature crystallization system in the prior art mainly includes: a crystallization chamber, and a heating device for heating the crystallization chamber. The low-temperature crystallization temperature is 35°C to 40°C, but this structure is easily affected by the heat transfer area, and the heat transfer efficiency is low , the processing volume is small, and the crystallization strength is poor, resulting in low crystallization efficiency and huge energy consumption in the low temperature crystallization system

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