Forced circulating and crystallizing device for industrial wastewater treatment

Abstract

The invention discloses a forced circulating and crystallizing device for industrial wastewater treatment, and relates to the wastewater treatment devices of the environment-friendly technical field. The forced circulating and crystallizing device comprises a crystallizer and a horizontal type double-tube-pass circulation heat exchanger. A charge hole of concentrated saline water is formed in the side wall of a crystallizer housing, the bottom of the crystallizer is connected with a discharge tube; and concentrated saline water from the discharge tube passes through a circulating pump and a forced circulating heat exchanger in sequence and then is returned to the crystallizer. Steam in the crystallizer is extracted from the top of the crystallizer through a thermal compressor after passing through a demister, and enters the forced circulating heat exchanger for heating and concentrating the concentrated saline water. Compared with the prior art, the double-tube-pass circulation heat exchanger is adopted for returning crystallized concentrated saline water into the crystallizer and separating, so that the separating effects are strengthened, the efficiency is improved, the blockage is avoided, and the normal operation of the compressor is guaranteed.

Description

technical field [0001] The invention relates to a wastewater treatment device in the field of environmental protection technology, in particular to a forced circulation crystallization device for industrial salty wastewater. Background technique [0002] The forced circulation heat exchangers in the prior art are all single-tube programs, and a large circulation volume is required to achieve a suitable flow rate, otherwise saturated salts will precipitate and adhere to the heat exchange tube walls, fouling will affect heat transfer and even cause blockage. Usually, the steam generated by the crystallizer contains more liquid droplets. This steam directly enters the compressor without the demister, which will cause the liquid droplets entrained by the steam to deposit on the impeller, and the residual salt of the liquid droplets will cause the compressor to vibrate. Cause compressor shutdown, can not obtain high-quality distillate. Contents of the invention [0003] In or...

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Problems solved by technology

[0002] The forced circulation heat exchangers in the prior art are all single-tube programs, and a large circulation volume is required to achieve a suitable flow rate, otherwise saturated salts will precipitate, adhere, and scale on the heat exchange tube walls, which will affect heat transfer and even cause blockage

Usually, the steam generated by the crystallizer contains more liquid droplets. This steam directly enters the compressor without the demister, which will cause the liquid droplets entrained by the steam to deposit on the impeller, and the residual salt of the liquid droplets will cause the compressor to vibrate. Cause compressor shutdown, unable to obtain high-quality distillate

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