| Abstrakt: |
The effect of filtration velocity on the filtration efficiency of a dual-layer granular bed 400°C was studied. The results showed that the bed filtration efficiency decreased from 99.87% to 99.85% as the average filtration velocity increased from 0.20 to 0.35 m/s. The effects of the filtration velocity on the efficiency of the upper and lower filtration layers were different. For the upper filtering layer, a higher filtration velocity resulted in decreased filtration efficiency, whereas the grade filtration efficiency increased with an increase in the particle size at the beginning of the test. However, toward the end of the test, it first decreased and then increased, with the critical point appearing at 0.23 μm. For the lower filtering layer, increasing the filtration velocity resulted in higher filtration efficiency. The grade filtration efficiency curve was V-shaped, with the critical points moving from 1.52, 1.45, and 1.32 μm at the beginning of the test to 1.63, 1.54, and 1.37 μm at the end of the test, respectively. In addition, the dust concentration at the outlet was maintained below 18 mg/m3. The dual-layer granular beds maintained efficient and reliable performance at high temperatures. [ABSTRACT FROM AUTHOR] |
