Vacuum desalination system and process

Abstract

The invention provides a vacuum desalination system and process. The system comprises a water pumping and preheating device, a vacuum distillation device, a fresh water storage device, and a system control device which is electrically connected with the vacuum distillation device and the fresh water storage device, wherein the water pumping and preheating device, the vacuum distillation device, the fresh water storage device and the system control device are sequentially connected. The water pumping and preheating device comprises a seawater filter and a seawater preheating pool. The vacuum distillation device comprises a seawater heater and a steam condenser. The fresh water storage device comprises a closed vacuum fresh water tank and a vacuum pump communicated with the vacuum fresh water tank. According to the vacuum desalination system and process, the seawater to be desalted is preheated through waste heat of the concentrated seawater generated after evaporation is conducted through the seawater heater, fresh water steam is condensed through temperature difference between the seawater and the steam, the waste heat generated by the system and energy of the nature are fully utilized, and thus the system has the functions of energy conservation and environment protection; the vacuum pump is arranged on the system to provide the functions of vacuum degree and water pumping for the system, and one pump is used for multiple purposes; through the desalination process based on the vacuum desalination system, fresh water production is higher than that of products and processes of the same heat collecting temperature.

Description

technical field [0001] The invention relates to the field of seawater desalination, in particular to a vacuum seawater desalination system and process. Background technique [0002] my country has a vast territory and abundant seawater and underground brackish water resources. Under the severe situation of fresh water shortage, the development and utilization of seawater and brackish water resources and the desalination of seawater (brackish water) have become an effective way to increase revenue and reduce expenditure and solve the problem of my country's fresh water shortage. strategic approach. Seawater desalination technology is the technology and process of separating the salt and water in seawater to finally obtain fresh water and concentrated brine. According to the classification of desalination process, seawater desalination methods mainly fall into three categories: thermal method, membrane method and chemical method. Thermal seawater desalination technology is ma...

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Problems solved by technology

Chinese patent CN 101177308A utilizes the natural method of seawater gravity and atmospheric pressure to generate vacuum, which requires less energy than the traditional method, but this method uses water injection and evacuation to obtain vacuum, first of all, the vacuum degree is low, and the vacuum degree will gradually decrease during the seawater evaporation process. Decrease until it is balanced with the atmospheric pressure, resulting in unstable vacuum, and the boiling point of seawater cannot be kept stable, so it is difficult to increase the fresh water production

[0003] During the process of pumping seawater in the seawater desalination system, due to the salt content and mineral content of the seawater, it has a certain corrosion effect on the seawater pumping pump, so the maintenance and repair of the seawater pumping pump increases the cost

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