Apparatus and method for evaporating and concentrating liquid

Abstract

The present invention provides a liquid-separation film-concentration evaporation-concentration system and a method thereof. The stock solution at a given temperature is contacted with a drainage porous film; water vapor passes through the porous film in gas-state way and is removed and condensed for collection at the other side of the film. Through the cycling of the process procedures, the concentrated substance of the stock solution can be obtained at one side of the film, and is rich in the inorganic ion and the organism in the processed water, and pure water can be obtained at the other side of the film. Therefore, the pure water can be directly recycled for use; solid substances such as the concentrated crystallized salt can be obtained at the bottom of a thermal pool. The air-lifting up-floating liquid can be precipitated and solidified with the methods such as adding of the flocculating agent, acid, alkaline and other chemical agents or with other well-known methods; solid-liquid separation is performed through the hydrophilia film; the clean liquid that is filtered by the film is returned to the evaporator so as to be continued for evaporation and concentration. For the sewage treatment, the sewage drainage quantity can be greatly reduced; for the separation of the sea water and the fermentation solution, the crystallized salt can be obtained directly.

Description

technical field [0001] The invention relates to a membrane method liquid concentration treatment equipment and a treatment method. Background technique [0002] Membrane distillation (Membrane Distillation, MD) has attracted worldwide attention and research in recent years. Compared with the conventional distillation (Distillation) process, the operating temperature of MD is low, there is no need to heat the solution to boiling, and the evaporation area is large, and the vapor space is small; compared with other pressure-driven membrane separation processes, the operating pressure of MD is low, High desalination rate and less membrane fouling. The membrane distillation process is driven by the vapor pressure difference on both sides of the microporous hydrophobic membrane, and the water vapor passes through the hydrophobic membrane from the heated raw water side and then is condensed into a liquid separation process. Due to the hydrophobicity of the membrane, raw water and...

AI Technical Summary

Problems solved by technology

[0008] There are several problems in the actual application of the current VMD process: First, most VMD processes use the method of hot water flowing from the inside of the hollow fiber of the column membrane module. When the inner diameter of the hollow fiber membrane is small, the suspended impurities in the concentrated water and Inorganic scale is easy to block the flow channel of the hollow fiber membrane. When the inner diameter of the hollow fiber membrane is large, the membrane area filled in the membrane module per unit volume is reduced, and the strength of the hollow fiber membrane is weakened.

Second, when the VMD process adopts the method of hot water flowing from the outside of the hollow fiber of the column membrane module, the uneven flow distribution of the hot side fluid will lead to uneven temperature of the hot side fluid, which will affect the liquid evaporation efficiency

Images