Exhaust gas freezing recovery treatment device

Abstract

The invention discloses a tail gas refrigeration recycling processing device which comprises a heat exchanger. A heat preservation layer covers the surface of the heat exchanger, a plurality of heat exchange nest tubes are arranged in the heat exchanger, the heat exchange nest tubes, a cold water machine and a cold water pump form a circulation system, the temperature of liquid in a tube pass of the heat exchange nest tubes can be set from minus 10 DEG C to plus 10 DEG C, a shell pass of the heat exchange nest tubes is filled with a padding ring with the certain height and an organic solvent, the padding ring is used for dispersing gas, and the liquid level of the organic solvent is slightly higher than the height of the padding ring. A tail gas inlet tube and a valve for discharging the organic solvent are arranged on the circumference of the bottom of the heat exchanger, and the circumference of the top of the heat exchanger is connected with a vacuum pump. The tail gas refrigeration recycling processing device is simple in structure, high in practicability, capable of recycling more than 90% of the organic solvent in the tail gas and wide in application prospect. Evaporation energy consumption of the organic solvent is saved by more than 30%.

Description

technical field [0001] The invention relates to a tail gas freezing recovery treatment device. The tail gas refers to a mixed gas which is evacuated together with other gases after evaporation of alcohol and other organic solvents and fails to condense into liquid through a condenser. Background technique [0002] Vacuum vaporization and condensation of organic solvents such as alcohol are often used in production and processing such as concentration, leaching, and extraction. However, due to the inevitable mixing of other gases in the organic solvent vapor, these gases will form an air film on the surface of the condenser. Large resistance to mass transfer and heat transfer, so that the vaporized solvent cannot be condensed into a liquid, and it will be pumped out with the air by the vacuum pump and cannot be recovered, resulting in a large amount of solvent loss. [0003] Sometimes in order to reduce the loss of solvent, the vacuum pump can only be turned off, but this wil...

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Problems solved by technology

[0002] Vacuum vaporization and condensation of organic solvents such as alcohol are often used in production and processing such as concentration, leaching, and extraction. However, due to the inevitable mixing of other gases in the organic solvent vapor, these gases will form an air film on the surface of the condenser. Large resistance to mass transfer and heat transfer, so that the vaporized solvent cannot be condensed into a liquid, and it will be pumped out with the air by the vacuum pump and cannot be recovered, resulting in a large amount of solvent loss

[0003] Sometimes in order to reduce the loss of solvent, the vacuum pump can only be turned off, but this will increase the air pressure in the tank, increase the boiling point of the solvent, increase the energy consumption of evaporation, and reduce the efficiency, which cannot meet the needs of modern production.

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