Device and method for sensitively detecting film penetration pressure value in film distillation process

Abstract

The invention discloses a device and method for sensitively detecting a film penetration pressure value in a film distillation process, wherein the device comprises a gas storage tank, a film penetration test assembly, a direct current power supply, a high-sensitivity electric bridge and a diaphragm to be tested, wherein the film penetration test assembly comprises an accommodating barrel, a flange plate and a bottom plate; the diaphragm to be tested is positioned between the flange plate and the bottom plate; a conducting sheet is arranged between the diaphragm to be tested and the bottom plate; the gas storage tank is connected with the accommodating barrel through a pressure reducing valve, a pressure regulator and a pressure meter; an upper binding post and a lower binding post are further arranged on the upper end of the accommodating barrel and the lower side of the conducting sheet; the direct current power supply is connected with the upper binding post and the lower binding post; two conducting posts are further distributed on the side wall of the accommodating barrel; and the high-sensitivity electric bridge is connected with the two conducting posts. By using the method,the device is used for performing film penetration pressure detection. According to the device and the method provided by the invention, the film soaking phenomenon can be reflected through the electric parameter detection of the film assembly, so that the maximum operation pressure capable of being born by the system can be fast and accurately indicated.

Description

technical field [0001] The invention relates to the technical field of membrane distillation separation, in particular to a device and method for sensitively detecting membrane percolation pressure values ​​during membrane distillation. Background technique [0002] Membrane distillation is an emerging low-energy (such as waste heat, waste heat thermally driven) water treatment process. It is a filtration and separation method based on hydrophobic membrane materials; its process principle is (taking seawater desalination as an example): feed liquid (located in the membrane The water molecules in the heating end, high temperature area) are vaporized by heat, and driven by the partial pressure difference of the vapor on both sides of the membrane, they migrate through the membrane material in the form of steam, and condense in the permeated liquid (located at the other end of the membrane, low temperature area) back to liquid water. Ideally, the membrane material only allows ...

AI Technical Summary

Problems solved by technology

This method cannot accurately and sensitively describe the local soaking phenomenon in one or several membrane pores, resulting in the hysteresis of the captured soaking phenomenon, that is, the soaking threshold (the driving pressure value of the membrane) is too high

In the operation of the membrane distillation process, if the operating pressure value determined by this method is used, it will cause rapid wetting of the membrane and cause the failure of the entire membrane module

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