A distillation system for treating salty wastewater

Abstract

The invention discloses an MVR distillation system used for treating salt-containing wastewater. The MVR distillation system comprises a wastewater evaporator, an intermediate medium evaporator, an intermediate medium compressor, a wastewater preheater and an intermediate medium preheater. The MVR distillation system is characterized in that compression and heat exchange pipelines of an intermediate medium are led, and temperature changes of the intermediate medium are utilized to generate heat exchange with wastewater; in an operation process, the wastewater preheater and the intermediate medium preheater effectively utilize waste heat, so that the energy-saving effect is good; salt-containing wastewater is isolated from a compressor pipeline, so that salt-containing water vapor is prevented from generating harm such as corrosion on the compressor, and therefore, maintenance cost is reduced, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a distillation system for treating salty waste water. Background technique [0002] With the increasingly stringent environmental protection standards and the gradual rise in energy prices, the industry's performance requirements for sewage distillation treatment continue to increase. The multi-effect distillation system in the prior art has been difficult to meet the needs of the industry; in the foreseeable future, only efficient MVR distillation The system can be competent for the distillation treatment of salty wastewater; the steam generated by the evaporator in the MVR distillation system is pressurized and turned into high-pressure and high-temperature steam and sent back to the evaporator as the heat source of the evaporator, so that the latent heat in the steam can be fully utilized; now The energy consumption of the state-of-the-art MVR distillation sys...

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Problems solved by technology

[0002] With the increasingly stringent environmental protection standards and the gradual rise in energy prices, the industry's performance requirements for sewage distillation treatment continue to increase. The multi-effect distillation system in the prior art has been difficult to meet the needs of the industry; in the foreseeable future, only efficient MVR distillation The system can be competent for the distillation treatment of salty wastewater; the steam generated by the evaporator in the MVR distillation system is pressurized and turned into high-pressure and high-temperature steam and sent back to the evaporator as the heat source of the evaporator, so that the latent heat in the steam can be fully utilized; now The energy consumption of the state-of-the-art MVR distillation system is more than 20% lower than that of traditional multiple-effect stills

[0003] The steam compressor is the core component of the MVR distillation system, but in the process of treating saline wastewater, the salt in the wastewater will be transported to the steam compressor and related pipelines along with the steam; High corrosiveness, in addition, excessive salt deposition can also cause pipeline blockage, affecting the reliability of the distillation system

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