A high-temperature sewage treatment and distilled water preparation system and its control method

Abstract

The invention provides a high-temperature sewage treatment and distilled water preparation system and control method, including a flash evaporator, a steam compressor, a contact condenser, a distilled water tank, an air-cooled heat exchanger and an electric hot water tank. The steam outlet of the steam compressor is adjusted The valve is connected to the inlet of the water vapor compressor, and the outlet of the water vapor compressor is connected to the bottom inlet of the contact condenser. One way of the condensed water outlet of the contact condenser is connected to the distilled water tank, and the other way is connected to the electric water tank through the air-cooled heat exchanger, and the outlet of the electric water tank passes through The water pump is connected to the spray pipe of the contact condenser, and the high-temperature sewage is connected to the spray pipe of the flash chamber. The invention treats high-temperature sewage above 50°C by direct flash evaporation, overcomes the problems of corrosion and scaling of traditional evaporative heat exchangers, and introduces the principle of mechanical steam recompression to effectively prepare high-temperature distilled water above 80°C, realizing the goal of sewage treatment At the same time, it can also meet the needs of industrial sites for domestic water.

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,...

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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

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