Multiple-effect membrane distillation method with high-efficiency inner heat recovering function

Abstract

The invention relates to a multiple-effect membrane distillation method with a high-efficiency inner heat recovering function. In a membrane distillation operation process, condensation heat of a distillation solution is recovered in a membrane assembly. In the method, both cold fluid feeding and hot fluid feeding can be adopted. When the cold fluid feeding is adopted, an external heat source needs to be supplied, and the gained output ratio in a multi-effect membrane distillation process is 4-20; and when the hot fluid feeding is adopted, no external heat needs to be supplied, and the gainedoutput ratio in the multi-effect membrane distillation process is 4-20. The method provided by the invention has the advantages of simple and mild operation conditions, low energy consumption and high gained output ratio, can be both implemented in a small-scale dispersion way and applied in an integration way to the fields of desalinization of seawater and brackish water, concentration of water solutions of non-volatile or semi-volatile solutes, environment protection and the like; when the method is used for the concentration of the water solutions and the antiosmosis concentrated water, ofthe non-volatile or semi-volatile solutes such as sodium chloride, ammonium sulfate, ammonium nitrate, sodium nitrate, sodium carbonate, sodium hydroxide, sulfuric acid, hydrochloric acid, glucose, xylitol, urea, glycerol, glycol, lactic acid, glyoxylic acid, dimethyl sulfoxide, sulfolane and the like, normal-pressure steam or hot water is used as a heat source, and the maximal gained output ratio can reach 13.7.

Description

technical field [0001] The invention belongs to the technical fields of water treatment, seawater desalination and environmental protection, and in particular relates to a multi-effect membrane distillation method with efficient internal heat recovery function. Background technique [0002] Water is the source of life, a precious and irreplaceable natural resource for human beings, and the lifeblood of social and economic development. my country's annual per capita fresh water resources are about 2,400 cubic meters, which is 1 / 4 of the world's per capita fresh water resources and ranks 110th among 149 countries in the world. It is a country with severe water shortages. Among them, the per capita water resources in North China are less than 400 cubic meters, which is already a serious problem. Water-scarce areas. The scarcity of water resources and the increasingly serious water pollution have become the bottleneck restricting the social progress and economic development of o...

AI Technical Summary

Problems solved by technology

In the example of this patent, the effect of heat recovery and utilization is better by connecting multiple frame components in a certain way, but the detailed experimental data is not clearly given in the example of this patent

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