MVR evaporative crystallization system

Abstract

The invention relates to the field of MVR evaporative crystallization equipment, in particular to an MVR evaporative crystallization system. The system comprises an evaporation tank, a crystallizer, aplurality of falling-film pipeline sets, a steam compressor and a water distribution device, wherein the plurality of falling-film pipeline sets are distributed in the evaporation tank along the circumference of the evaporation tank at equal angles; each falling-film pipeline set comprises a heat conduction sleeve and an inner heat conduction pipe arranged in the heat conduction sleeve, a liquidfeeding cavity is formed between the heat conduction sleeve and the inner heat conduction pipe, a thickening layer is arranged at the middle section area of the inner heat conduction pipe, and a spiral groove channel is formed in the thickening layer; the water distribution device is arranged at the top end of the evaporation tank and communicates with all the liquid feeding cavities; the crystallizer is arranged at the bottom of the evaporation tank and communicates with the evaporation tank; the bottom of the evaporation tank is provided with a steam distribution disc communicating with allthe inner heat conduction pipes; and the output end of the steam compressor communicates with the evaporation tank and the steam distribution disc through a steam circulation pipeline of a Y-shaped structure. According to the invention, the length of falling-film pipelines can be reduced, and meanwhile, a water film can be effectively heated and evaporated.

Description

technical field [0001] The invention relates to the field of MVR evaporation crystallization equipment, in particular to an MVR evaporation crystallization system. Background technique [0002] MVR evaporation technology is a relatively energy-saving evaporation technology. It usually consists of three major parts: evaporator, vapor-liquid separator and steam compressor. The traditional MVR system has disadvantages: large structure, especially the overall high evaporation tank, maintenance and Transportation is more troublesome. [0003] The existing MVR evaporation and crystallization system using a vertical tube falling film evaporator, the feed liquid flows in the vertical tube falling film evaporator under the double action of its own weight and steam flow, and the speed is extremely high. In order to ensure high efficiency, heating The length of the tube is usually long, which leads to a large vertical height of the vertical tube falling film evaporator, so the cost of...

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Problems solved by technology

[0002] MVR evaporation technology is a relatively energy-saving evaporation technology. It usually consists of three major parts: evaporator, vapor-liquid separator and steam compressor. The traditional MVR system has disadvantages: large structure, especially the overall high evaporation tank, maintenance and Transportation is more troublesome

[0005] The above scheme adopts the horizontal tube evaporator structure, which is not conducive to the evacuation of steam and the discharge of condensation. At the same time, it requires strict control of the delivery ratio of the delivery pump; and the lateral area of ​​the horizontal tube evaporator is much larger than before. The usable area will be more tight

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