COMPLETE AIR CLEANIG MAY REQUIRE THE REMOVAL OF
WE DEAL IN REMOVAL OF INERT PARTCLESAND MICRO-ORGANISM ONLY.
AIR FILTERS ARE SELECTED ON THE BASIS OF THREE OPERATING CHARACTERISTICS
INITIAL (CLEAN FILTER) EEFICIENCY SHOULD B CONSIDERD FOR DESIGN
SELECTION OF AIR FILTERS IS DONE FOR : 0.03, 5, 10, OR 20 MICRONS FILTRATION EFFICIENCY FROM CATALOGUE WHICH GIVES RATED AIR FLOW IN CFM AGISNT INITIAL PRESSURE DROP ( CLEAN FILTER ) IN MM WG
ATMOSPHERIC DUST IS FED TO THE FILTER, AND NUMBER OF PARTICLES PRESENT IN AIR BEFORE AND AFTER THE FILTER IS MEASURED BY A PARTICLE COUNTER AND EFFICIENCY AGAINST A PARTICLE SIZE IS OBTAINED.
Initial dust spot efficiency ( E a ) | Ea < 20 % | Ea> 20 % | |
Characteristics | Average arrestance Am ( % ) | Average efficiency Em ( % ) | |
Filter group | Filter Class | Class Limits | |
Coarse | G-1 G-2 G-3 G-4 |
Am< 65 65 < Am < 80 80 < Am < 90 < 90Am |
--- |
Fine | F-5 F-6 F-7 F-8 F-9 |
- - - - - |
40 < E m < 60 60 < E m < 80 80 < E m < 90 90< E m <95 95< E m |
TEST DUST: SYNTHETIC
PRESSURE DROP Vs. FLOW RATE:
Sr. No. | FLOW RATE PRESSURE DROP (IN MM WG ) | PRESSURE DROP (IN MM WG ) | PRESSURE DROP ACROSS TEST FILTER IN CLEAN CONDITION ( MM W. G. ) | |
---|---|---|---|---|
CMH | CFM | |||
1 | 402.5 | 236,7 | 15 | 1 |
2 | 805 | 473.5 | 30 | 2 |
3 | 1207.5 | 710.2 | 49 | 3 |
4 | 1610 | 947 | 72 | 4 |
Sr. No. | WEWIGHT OF FINAL FILTER (GRAMS) | GAIN IN WT. OFFINAL FILTER( GRAMS ) | DUST FED (RAMS) | DUST FED (RAMS) | PRESSURE DROP ACOSS TEST FILTER | ARRESTANCE ( % 0 ) |
---|---|---|---|---|---|---|
INITIAL | FINAL | |||||
1 | 4582 | -- | -- | -- | 3 | -- |
2 | 4582 | 4587 | 5 | 30 | 3 | 87 |
3 | 4587 | 4591 | 4 | 67.5 | 6 | 88 |
4 | 4591 | 4593 | 2 | 67.5 | 8 | 88 |
5 | 4593 | 4596 | 3 | 67.5 | 9 | 89 |
6 | 4596 | 4598 | 2 | 67.5 | 12 | 90 |
ARRESTANCE = 1 – [CUMULATIVE GAIN IN WT. OF FINAL FILTER / CUMULATIVE DUST FED ]