Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator
2. Experimental Materials and Methods
2.1. Experimental Filter Material Properties
2.2. Experimental Method
- Clean filter media sample filtration stage: Install the filter material sample on the filter material fixture, the diameter of the filter material sample was φ150 mm. When the pressure reached 1000 Pa, the pulse valve automatically opened for dust cleaning. The test time was recorded after 30 repetitions, the weight gain of the high-efficiency filter membrane was measured, and the exit dust concentration was calculated.
- Aging treatment stage: Aging experiments were conducted on the experimental filter media, and back-blowing pulse cleaning was forced at 5 s intervals, with 10,000 repeated blows, and the process lasted for about 14 h. During the aging process, the pulse jet time was 50 ms, and the vacuum pump was kept working. The continuous blowing caused the filter media to repeat the process of tensioning and relaxing under the strong influence of changing airflow, which aggravated the aging of the filter media.
- Stabilization treatment stage: in order to stabilize the filtration performance of the aged filter media samples, the experimental filter media was tested at a constant differential pressure of 1000 Pa for 10 cycles, according to (1).
- The filtration performance of the filter media after stabilization: For the filter cloth stabilized as described above, a constant differential pressure stabilization test of 1000 Pa was performed 30 times according to (1). The test time was recorded, the weight gain of the high efficiency filter membrane was measured, and the outlet dust concentration was calculated.
3. Results and Discussion
3.1. The Effect of Filter Material Properties on Filtration Efficiency
3.1.1. Comparison of the Filtration Efficiency of Different Materials of Filter Media
3.1.2. Comparison of the Filtration Efficiency of Filter Media with Different Grams
3.1.3. Comparison of the Filtration Efficiency of Filter Media with Different Surface Treatments
3.1.4. Comparison of Filtration Efficiency of Filter Media with Different Formulations
3.2. The Influence of Working Conditions on the Efficiency of Filter Media
3.2.1. Dust Filtration Efficiency of Filter Media under Different Constant Pressure Soot Cleaning Resistance
3.2.2. Dust Filtration Efficiency of Filter Media at Different Inlet Concentrations
3.2.3. Dust Filtration Efficiency of Filter Media at Different Filtering Velocities
4. Conclusions and Outlook
- Compared with PI and PTFE, PPS filter media had the highest filtration efficiency and the best filtration performance stability after a long period of operation.
- Increasing the mass per unit area of the filter media could improve the filtration performance, but the advantages will become less and less in the long term.
- The filtration effect of coated filter media was not as good as impregnation treatment because of the influence of the film formation process.
- Membrane-coated filter media showed the highest filtration efficiency, gradient filter media filtration performance was the second, followed by conventional filter media, ordinary blended, and blended ultrafine filter media.
- Changes in the experimental conditions had different effects on the dynamic dust filtration performance of the filter media. The filtration efficiency of the filter media increased with the increase of the constant pressure cleaning resistance. The filtration efficiency was slightly affected by the change in the inlet dust concentration, but decreased with the increase in filtering velocity.
Conflicts of Interest
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|Sample||Class||Gram Weight (g/m2)||Breathability (L/dm2·min)||Texture||Experimental Type|
|1||PPS fiber||544||148.68||PTFE||Different fiber material|
|4||PPS fiber||536||167.48||PPS||Different gram weight|
|6||PPS fiber by surface impregnation||540||178.84||PTFE||Different surface treatment process|
|7||(50%PPS + 50%PTFE) fiber||614||109.22||PTFE||Different mixed formulas|
|8||(70% common PPS + 30% superfine PPS) fiber (Blended ultrafine)||533||129.68||PTFE|
|9||(70% common PPS + 30% superfine PPS) fiber (gradient filter)||612||119.59||PTFE|
|10||PPS fiber coating a membrane||555||25.40||PTFE|
|11||(50% PPS + 50% PTFE) fiber coating a membrane||621||13.86||PTFE|
|1||test dust||Aluminium oxide||Drying process: dry at 105–110 °C and place in the dryer for more than one hour|
|2||dust concentration||5 g/m3||allowable deviation: ±7%|
|3||filtering velocity||2 m/min||allowable deviation: ±2%|
|4||injection pressure||5 bar||allowable deviation: ±3%|
|5||pulse jet time||50 ms||-|
|6||cleaning set-point pressure||1000 Pa||-|
|7||cleaning interval||5 s||ageing treatment|
|PPS (%)||PI (%)||PTFE (%)|
|Pure PPS (536 g/m2) (%)||Pure PPS (589 g/m2) (%)|
|Coating (%)||Dipping (%)|
|Common Fiber |
|Blending (%)||Blended Ultra-Fine (%)||Gradient Filter |
|Common Fiber Coating a Membrane (%)||Blended Fiber Coating a Membrane (%)|
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Chen, K.; Huang, Y.; Wang, S.; Zhu, Z.; Cheng, H. Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator. Appl. Sci. 2022, 12, 5824. https://doi.org/10.3390/app12125824
Chen K, Huang Y, Wang S, Zhu Z, Cheng H. Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator. Applied Sciences. 2022; 12(12):5824. https://doi.org/10.3390/app12125824Chicago/Turabian Style
Chen, Kuixu, Yaji Huang, Sheng Wang, Zhaoping Zhu, and Haoqiang Cheng. 2022. "Experimental Research on Dynamic Filtering Characteristics of Filter Materials for Electrostatic-Fabric Integrated Precipitator" Applied Sciences 12, no. 12: 5824. https://doi.org/10.3390/app12125824