High-temperature sewage treatment and distilled water preparation system and control method thereof

Abstract

The invention provides a high-temperature sewage treatment and distilled water preparation system and a control method thereof. The system comprises a flash evaporator, a water vapor compressor, a contact condenser, a distilled water tank, an air cooling heat exchanger and an electric heating water tank, wherein a steam outlet of a steam compressor is connected with an inlet of the water vapor compressor through a regulating valve; an outlet of the water vapor compressor is connected with the inlet at the bottom of the contact condenser, one path of a condensed water outlet of the contact condenser is connected with the distilled water tank, the other path of the condensed water outlet of the contact condenser is connected with the electric heating water tank through the air cooling heat exchanger, the outlet of the electric heating water tank is connected with a spray pipe of the contact condenser through a water pump, and high-temperature sewage is connected with the spray pipe of aflash chamber. By the adoption of the high-temperature sewage treatment and distilled water preparation system and the control method thereof, the problems of corrosion, scaling and the like of a traditional evaporative heat exchanger are overcome by directly carrying out flash evaporation treatment on the high-temperature sewage with the temperature of more than 50 DEG C; and high-temperature distilled water with the temperature of more than 80 DEG C is effectively prepared by introducing a mechanical steam recompression principle, so that the sewage treatment is achieved, and the demand of industrial field on domestic water is met.

Description

technical field [0001] The invention belongs to the fields of electromechanical, refrigeration, sewage treatment and waste heat recovery, and in particular relates to a sewage treatment and desalination system and a control method thereof. Background technique [0002] With the growth of population, the development of economy and the prominence of environmental pollution, water resources are becoming increasingly scarce. Although there are rivers, lakes, and groundwater in some areas, they cannot be directly used as domestic water due to water quality problems and the improvement of people's water standards. There are water plants in major cities and towns, but in remote areas, tap water cannot be reached. As well as some arid areas, a separate water treatment system is required. [0003] In the chemical industry, printing and dyeing, and steel and other industrial fields, a large amount of water needs to be consumed to meet the water demand of the process, such as cooling,...

AI Technical Summary

Problems solved by technology

[0004] The sewage treatment process is similar to the seawater desalination process. The commonly used methods are multi-effect distillation and multi-effect flash evaporation. Although the energy efficiency of multi-effect distillation is higher than that of efficient flash evaporation technology, the high-temperature steam in the heat exchange tube is exothermic and condensed into distilled water. It is used to spray sewage outside the evaporative heat exchange tube. The biggest problem with this technology is that it has certain requirements for the water quality to be treated. It is necessary to avoid the heat exchange tube from being corroded or scaled and reduce the water treatment capacity of the equipment. It is not suitable for Heavy water or certain corrosive sewage treatment

Images