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Semi-continuous automatic feed liquid evaporation device and feed liquid evaporation recovery method

An evaporation device and semi-continuous technology, applied in chemical instruments and methods, evaporation, separation methods, etc., can solve the problems of small concentration, corrosion of devices, and incompatibility of materials, so as to reduce delivery pump components and exhaust emissions Small, smooth feeding effect

Pending Publication Date: 2018-10-02
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used outer and lower circulation tube evaporator adopts a continuous operation mode. The raw material liquid enters from the bottom of the steam heating chamber, and the finished liquid overflows from the upper part of the lower circulation pipe. The steam heating chamber does not need to be emptied. After the process is determined, the concentration ratio Difficult to make major adjustments
This method is suitable for continuous operation, where the feed liquid does not need to be emptied, the treatment period is long, and the concentration multiple is not large. Constant, the situation where materials cannot be mixed between batches
When dealing with corrosive liquids containing nitric acid, nitrate, etc., due to the high boiling point of the solution, the material will seriously corrode the device due to atmospheric evaporation, which will affect the service life of the device.
Due to the above problems, it is difficult to effectively apply the conventional external down circulation tube evaporator in specific production

Method used

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  • Semi-continuous automatic feed liquid evaporation device and feed liquid evaporation recovery method

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Effect test

Embodiment 1

[0037] A semi-continuous automatic material-liquid evaporator of this embodiment includes a raw material tank 2, a separation chamber 9, a steam heating chamber 7, a condenser 13 and a condensate recovery tank 15;

[0038] The bottommost end of the separation chamber 9 communicates with the bottommost end of the steam heating chamber 7 through the lower circulation pipe 6, and the middle and lower part of the separation chamber 9 communicates with the upper part of the steam heating chamber 7 through the upper circulation pipe 23. The lowest end of the circulation pipe 6 is provided with a finishing liquid discharge valve 18, and the pressure introduction pipe 24 connecting the lowest end of the lower circulation pipe 6 with the topmost end of the separation chamber 9 is provided with a separation chamber liquid level sensor 10, The top steam inlet of the steam heating chamber 7 is provided with a steam regulating valve 8, and the liquid level sensor 10 of the separation chambe...

Embodiment 2

[0056] Add a volume of 80L magnesium nitrate solution into the raw material tank, set the pressure of the separation chamber to -80kPa, the liquid level of the separation chamber to 780mm, the feed rate to 8L / h, the concentration factor to 16, the discharge level of the condensate to 680mm, the compressed air to 0.3MPa, and the heating steam Pressure 0.2MPa. Turn on the cooling water, steam generator, and run the evaporation device. The metering pump continuously adds the magnesium nitrate solution into the heating chamber. When the liquid level in the separation chamber reaches 780mm, the evaporation starts automatically, and the evaporation continues for 9.4 hours. After the feeding is completed, the completed liquid is automatically discharged into the recovery container, and the cleaning port is fed with water to clean the heating chamber. , lower circulation pipe 1 time, respectively measure the amount of magnesium nitrate retained in the finished liquid, condensate, and ...

Embodiment 3

[0058] Add copper nitrate solution with a volume of 150L into the raw material tank, set the pressure of the separation chamber to -80kPa, the liquid level of the separation chamber to 780mm, the feed rate to 5L / h, the concentration factor to 30, the discharge level of the condensate to 680mm, the compressed air to 0.3MPa, and the heating steam Pressure 0.2MPa. Turn on the cooling water, steam generator, and run the evaporation device. The metering pump continuously adds the copper nitrate solution into the heating chamber. When the liquid level in the separation chamber reaches 780mm, the evaporation starts automatically and lasts for 29 hours. Lower the circulation pipe once, measure the amount of copper nitrate retained in the finished liquid, condensate, and device respectively, and the calculated recovery rate is 99.5%.

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Abstract

The invention discloses a semi-continuous automatic feed liquid evaporation device and a feed liquid evaporation recovery method. The semi-continuous automatic feed liquid evaporation device comprisesa raw material tank, a separation chamber, a steam heating chamber, a condenser and a condensate recovery tank, wherein a separation chamber liquid level sensor is arranged on a pressure guide pipe connecting the lowest end of a lower circulation pipe with the uppermost end of the separation chamber, a steam regulating valve is arranged at a steam inlet of the steam heating chamber, the separation chamber liquid level sensor is in communication connection with a PLC, and the PLC is used for controlling the opening degree of the steam regulating valve; a secondary steam outlet in the top end of the separation chamber is communicated with the top end of the condenser through a steam pipeline, a condensate outlet of the condenser is communicated with the condensate recovery tank by a condensate inlet valve and a pipe, and a condensate discharge valve is arranged at a condensate outlet of the condensate recovery tank. The device can realize continuous feeding, intermittent discharging andfull-automatic operation, and has remote operation function.

Description

technical field [0001] The invention relates to the technical field of concentration and recovery of feed liquid, in particular to a semi-continuous automatic outer and lower circulation tube evaporation device applied to feed liquid containing nitrate and nitric acid. Background technique [0002] Evaporation removes volatile components in the feed liquid, increases the concentration of non-volatile components, realizes material recovery, waste volume reduction and discharge, etc. Evaporators have been widely used in chemical, pharmaceutical, food, environmental protection and other industries. [0003] In the recovery of nitrate, the evaporation device is a device used to heat the nitrate solution to evaporate and concentrate it, and finally recover the nitrate. At present, the commonly used outer and lower circulation tube evaporator adopts a continuous operation mode. The raw material liquid enters from the bottom of the steam heating chamber, and the finished liquid ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D1/00B01D1/30
CPCB01D1/0082B01D1/30
Inventor 赵刚于震孙亮王筠许文强
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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