Comprehensive analysis of filter material dynamic and static filtration efficien

The filter material dynamic and static filtration performance tester/VDI filter material filterability tester is used to evaluate the dynamic and static dust removal efficiency and filtration performance of the filter material. By simulating the real situation of the filter material in the actual use process, the use performance of the filter material can be quickly obtained Evaluation parameters to accurately evaluate the quality, performance and life of filter materials.

 

Test details:

 

It can simulate the use process of the filter bag in the bag filter, and the filter material is aged according to the standard process (usually for several days). After the performance of the filter material becomes stable, the characteristic filter index of the specific concentration of aerosol before and after passing the filter material is tested. "(Including pressure drop curve, residual pressure drop, filtration/cleaning cycle, remaining dust layer quality, and dust quality of permeable filter material samples, etc.) The results can be used to evaluate the filtering efficiency of the filter material in actual use.

 

Test principle:

 

1. The air is first sent into the vertical dust generating duct to generate a dirty air flow full of dust. The dust is dispersed with the compressed air in the dust generator, and the concentration is formed evenly distributed throughout the vertical pipeline and flows downwards. Part of the horizontal pipeline passes through the tested filter material with the inhalation airflow, so that it is exposed to a constant airflow and dust concentration. To simulate the operation of cleanable filter media.

2. The dust forms a powder cake, which leads to an increase in pressure drop. The differential pressure sensor detects the change in pressure drop before and after the tested filter material in real time. Once the pressure drop reaches the preset value, the system releases a pulse of clean compressed air towards the powder cake generated on the dirty side, and does not affect the air flow to perform back-blowing and cleaning (on-line cleaning).

3. The tested filter material filters the dust again, and so on. The cleaning pulse must be time-accurate and highly repeatable, so that the pressure surface of each pass through the filter material is evenly balanced.

4. The removed powder and remaining dust fall down with the vertical airflow to the dust collector at the bottom of the dirty air pipe. Equipped with a dirty gas filter, so that the dust will not redisperse upstream of the dirty gas of the tested filter material, resulting in an unclear dust concentration, which makes the measurement invalid (especially the important parameter: the residual pressure drop value); this design achieves error-free The long-term operation of the instrument does not require frequent and comprehensive interruption of measurement due to cleaning up dust deposits.

Applicable standards of filter material dynamic and static filter performance tester/VDI filter material filterability tester:

 

VDI/DIN3926 Standard Test Method for Evaluating Cleanable Filter Media

ISO11057 Air Quality-Test Method for Filtering Performance of Cleanable Filter Media

ASTM/D6830 test method to determine the pressure drop and filtration performance of cleanable filter media

Technical requirements for GB/T6719 bag filter

JISZ8909-1 Test method for filter media for dust collection. Part 1: Filtration efficiency

 

The main parameters:

 

1. Export dust concentration;

2. Test the quality change of the filter material;

3. Initial residual pressure drop, average residual pressure drop, residual pressure drop increment;

4. Average filtration cycle;

5. Dust removal efficiency, penetration rate;

6. Cleaning time, cleaning cycle;

7. Static dust removal efficiency;

8. Dynamic dust removal efficiency

 

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