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Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof

A technology of evaporative concentration and countercurrent, which is applied in the field of multi-effect plate type rising film countercurrent evaporative concentration device, which can solve the problems of easy crystallization and precipitation of heat-sensitive substances, and achieve the effect of avoiding the possibility of surface scaling and reducing energy consumption

Active Publication Date: 2014-04-02
SHANGHAI DISEN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the phenomenon that crystallization is easy to occur when heat-sensitive substances are concentrated in the prior art, and to provide a multi-effect plate type rising film countercurrent evaporation concentration device and method

Method used

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  • Multi-effect plate type rising film countercurrent evaporation concentration device and method thereof

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Effect test

Embodiment 1

[0035] Concentration of sodium gluconate stock solution: the mother liquor generated by the oxidation method enters the fifth effect of the unit with a temperature of 45 degrees Celsius and a Baume degree of 16, the fifth effect unit vacuum absolute pressure is 0.0123MPa, and the evaporation temperature is 50 degrees Celsius; after evaporation and dehydration, it enters the fourth effect. During the evaporation unit, the mother liquor temperature is 50 degrees Celsius, the Baume degree is raised to about 18 to 19, the vacuum absolute pressure of the fourth effect unit is 0.018MPa, and the evaporation temperature is 57 degrees Celsius; the mother liquor temperature when entering the third effect evaporation unit after evaporation and dehydration is 57 degrees Celsius , the Baume degree is increased to about 21, the vacuum absolute pressure of the third effect unit is 0.024MPa, and the evaporation temperature is 64 degrees Celsius; the mother liquor temperature is 64 degrees Celsi...

Embodiment 2

[0037]Concentration of glucolactone stock solution: the original concentration of the mother liquor produced by the fermentation method is about 17% when entering the unit, and the temperature is about 30-35 degrees Celsius. Entering the fifth effect, the vacuum absolute pressure of the fifth effect unit is controlled at 0.01MPa, and the evaporation temperature is 46 degrees Celsius; the mother liquor temperature is 46 degrees Celsius when entering the fourth effect evaporation unit after evaporation and dehydration, the vacuum absolute pressure of the fourth effect unit is 0.015MPa, and the evaporation The temperature is 53 degrees Celsius; the mother liquor temperature is 53 degrees Celsius when entering the third effect evaporation unit after evaporation and dehydration, the vacuum absolute pressure of the third effect unit is 0.02MPa, and the evaporation temperature is 60 degrees Celsius; the mother liquor temperature when entering the second effect evaporation unit after ev...

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Abstract

The present invention relates to the technical fields of a multi-effect evaporation concentration process and equipment, and specifically to a multi-effect plate type rising film countercurrent evaporation concentration device and a method thereof. The device comprises a plate type heat exchanger structure and a flash evaporation tank structure. The device is characterized in that the device comprises five groups of plate type rising film countercurrent evaporation devices, wherein the five groups of the plate type rising film countercurrent evaporation devices form a series connection; each group of the plate type rising film countercurrent evaporation device comprises a plate type heat exchanger, a flash evaporation tank, and a pump; each group of the plate type rising film countercurrent evaporation device is in the sealed negative pressure system condition; the pressure inside each group of the device is increased along with the increase of the raw material liquid concentration. The raw materials are subjected to heat exchange through the plate type heat exchanger, and then are separated from the solvent through the flash evaporation separator. The heat exchange treatments are sequentially performed until the material enters the fifth group of the flash evaporation tank. The heat-exchanged steam and the steam discharged from the outlet of the fifth group of the flash evaporation tank are introduced into the outlet pipe. With the present invention, the heat energy of the secondary steam after separation is completely utilized; the reverse heat exchange of the heat exchanger and the designed negative pressure and temperature condition limit the generation of the vaporization phenomenon of the material liquid in the heating process so as to reduce the scaling possibility.

Description

[Technical field] [0001] The invention relates to the technical field of multi-effect evaporation and concentration technology and equipment, in particular to a multi-effect plate type rising film countercurrent evaporation and concentration device and method. [Background technique] [0002] At present, shell-and-tube heat exchangers or plate-type heat exchangers are generally used in the evaporation and concentration process. Due to its large size, the shell-and-tube heat exchangers require two or more operating platforms for the height of the whole set of devices from ten meters to several tens of meters; Aspects are limited: such as material properties, requirements of process conditions, etc. Therefore, most shell-and-tube heat exchangers generally can only achieve three-effect design, and the heat exchange efficiency is too low, so they are gradually replaced by plate heat exchangers. [0003] Domestic patent CN1864783A discloses a multi-effect evaporation desalination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D1/26
Inventor 周轶松周鼎
Owner SHANGHAI DISEN ENERGY TECH
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