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Method for evaluating filtering precision and efficiency of submicron liquid-solid separation system

A filtration accuracy, sub-micron technology, applied in the testing of machines/structural components, analysis of suspensions and porous materials, measuring devices, etc.

Active Publication Date: 2020-08-18
ADVANCED TECHNOLOGY & MATERIALS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For this reason, the technical problem to be solved by the present invention is to provide a method for evaluating the filtration accuracy and efficiency of a submicron liquid-solid separation system. The evaluation of micron-level liquid-solid separation filtration accuracy and filtration efficiency has the advantage of reducing the amount of engineering trial and error, and is suitable for the evaluation of sub-micron-level liquid-solid separation filtration performance including nuclear power high-precision water filter elements

Method used

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  • Method for evaluating filtering precision and efficiency of submicron liquid-solid separation system

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Embodiment 1

[0030] A water filter is required to filter particles with a filtration accuracy of 0.5 μm and a filtration efficiency of 95%. Based on this, it is required to test the filter element of a specified filter material (the pore size value of the filter element is measured by a pore size testing instrument D 实测 =7.23μm) can meet the requirements. Since it is difficult for the current test device to directly detect parameter information such as filtration efficiency with a filtration accuracy of 0.5 μm, the method of the present invention is used for evaluation.

[0031] Mix MTD A3 powder evenly in pure water to prepare the raw material solution required for the test, and then use the filtration performance test device to conduct the filtration test. The filtration test equipment is a routinely used testing equipment, which mainly includes a raw liquid tank, a pump, a filter, a flow meter, a differential pressure meter, pipelines and valves. The test conditions are: the test flow ...

Embodiment 2

[0045] For another test filter material of the same type as in Example 1, its pore diameter measured by a pore size tester is D 实测 = 1.15 μm, it is required to judge whether the filtration efficiency of 99% can be achieved under the filtration accuracy of 0.5 μm.

[0046] Adopt same test condition among the embodiment 1, obtain its fitting equation under 99% filtration efficiency to be Y=-2.5195E-3X3+7.7665E-2X2-0.7251X+3.5547, get X=0.5, then calculate Y= 3.21.

[0047] From Y=D / X, the theoretical pore diameter D can be obtained 理论 = 1.61 μm, which is 1.15 μm larger than the measured pore size, therefore, it is judged that the filter material can meet the requirements.

[0048] At the same time, the rationality of the filter material selection can be evaluated, because the measured pore size D 实测 =1.15μm is much smaller than the theoretical aperture D 理论 =1.61μm, therefore, it is too strict to evaluate this selection. Since the cost of the filter material with smaller po...

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Abstract

The invention belongs to the technical field of nuclear power water filtering performance evaluation, particularly relates to a method for evaluating the filtering precision and the efficiency of a submicron liquid-solid separation system. The method is suitable for evaluating the filtering performance of a submicron liquid-solid separation filter and designing and selecting models of the submicron liquid-solid separation filter. According to the evaluation method, the actual measurement inspection and mathematical analysis are combined; the method comprises the following steps: firstly, correspondingly testing parameters such as filtering precision, pore diameter and filtering efficiency of particles of more than 1 mu m by utilizing the existing test device and method; filtering under thecondition of specified filtering efficiency; the filter performance of particles of 1 [mu] m or more is a relationship curve of filter material pore diameter / filter precision (Y)-filter precision (X). Then fitting is conducted to obtain a regression equation based on X-Y, the regression equation obtained through fitting extends towards the submicron interval, the relation among the filtering precision X, the filtering aperture D and the filtering efficiency eta in the submicron interval is calculated, and effective evaluation of the submicron-level liquid-solid separation filtering performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of nuclear power water filtration performance evaluation, and specifically relates to a method for evaluating the filtration accuracy and efficiency of a submicron liquid-solid separation system, which is suitable for the filtration performance evaluation and design selection of submicron liquid-solid separation filters. Background technique [0002] At present, the common reactor types of nuclear power plants are pressurized water reactors and heavy water reactors. Regardless of the reactor type, dozens of radioactive water filters will be installed in each nuclear power plant. The core component of the water filter is the filter element. In the existing technology, in addition to the common precision filter elements such as 2μm, 5μm, and 20μm, some water treatment systems require the use of sub- Micron-level filter element, and its filtration efficiency is generally required to be above 98%, while filtrati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01M99/00
CPCG01N15/08G01M99/008G01N2015/084
Inventor 李生勇郑之寿陈利军杨军军曹延玮李继慧范胜吴小波平韶波李华辉商文靓陈红霞王跃成
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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