超高效過濾器的容塵量比較研究 · iso 50 u ─ ≧99.999 iso 55 u u15 ≧99.9995 iso 60...

「節能製造與微污染控制」產品及技術發表研討會 2018年12月21日(五)


超高效過濾器的容塵量比較研究

林廸國立台北科技大學潔淨技術研發中心

1


Introduction

• A test facility of HEPA total efficiency is setup a square air duct. The filter

material is glass fiber classified to the European regulations H13 category.

• Air velocity is set at 0.25, 0.4 m/s and the PAO aerosol is released from an

aerosol generator by using Laskin nozzle. Both upstream and downstream

aerosol concentration and penetration rate is measured by using light-scattering

photometer.

• In this study, different filter surface velocity, challenge aerosol concentration

and filter thickness were tested to identify the variation of dust holding capacity,

filter penetration rate and filter pressure drop.

2


Trapping efficiency & penetration ratio

• P : Penetration ratio of air filter

• CN, u :Aerosol concentration of upstream

• CN, d : Aerosol concentration of downstream

• E : Trapping efficiency of air filter

3


Specification

• Common standard :

– EN 1822-2009

– ISO 29463

– ISO E、H、U:

– EPA、HEPA、ULPA

4

classificationeff,%

ISO 29463 EN1822

ISO 15 E E11 ≧95

ISO 20 E ─ ≧99

ISO 25 E E12 ≧99.5

ISO 30 E ─ ≧99.9

ISO 35 H H13 ≧99.95

─ ─ ≧99.97

ISO 40 H ─ ≧99.99

ISO 45 H H14 ≧99.995

ISO 50 U ─ ≧99.999

ISO 55 U U15 ≧99.9995

ISO 60 U ─ ≧99.9999

ISO 65 U U16 ≧99.99995

ISO 70 U ─ ≧99.99999

ISO 75 U U17 ≧99.999995

International HEPA&ULPA grade


Experimental Setup

• PAO is used in this study as challenge aerosol

• Constant air flow rate is obtained by adjusting the fan speed using VSD

• Laskin nozzle PAO generator (Cold) is used in this study

• HEPA filter penetration rate is measured by using light-scattering photometer

• The weight of HEPA filter is measured by electronic scale

5

Experiment system


Filter Duct Holding Capacity (DHC) test rig

6

(d) pressure gauges(g) Anemometer

a HEPA

bCentrifugal

Fan

f Inverter

h PAO

PAO


Filter Duct Holding Capacity (DHC) test rig

7

(c) Light-scattering photometer (e)PAO generatorElectronic- scale


Experiment parameters for Case A ~ Case J

8

case Velocity (m/s)PAO concentration

(μg/L)

Final pressuredrop(Pa)

A0.4

50

600B 25

C0.25

50

25D

E、F、G 0.2550 500

H、I、J 0.4


9

Experiment parameters for Case K ~ Case N

caseVelocity

(m/s)

PAO

concentration

(μg/L)

Final pressure

drop

Pa

Thickness

(mm)

K

0.4 50 500

50

L 69

M 78

N 117


Testing procedures

• For Case A ~ Case D

– The aerosol penetration rate was measured and recorded every hour,

– After the pressure drop exceed twice of the initial pressure drop, the recording

interval reduce to every 30mins.

• For Case E ~ Case J

– The aerosol penetration rate and the weight of filter was measured and recorded

when the filter pressure drop reaches 100, 150, 200, 300, 400, and 500 Pa.

– For Case E ~ Case G, Air velocity is 0.25 m/s, and PAO concentration is 50 μg/L

– Air velocity is 0.4 m/s, and PAO concentration is 50 μg/L in case H~J

10(experimental conditions)


99.960

99.965

99.970

99.975

99.980

99.985

99.990

99.995

100.000

0 2 4 6 8 10 12

經過時間(hr)

效率

(%)

A

B

C

D

0.4 m/s

0.4 m/s

0.25 m/s

0.25 m/s

PAO=50 μ g/L

PAO=50 μ g/L

PAO=25 μ g/L

PAO=25 μ g/L

case A B C D

Dust(g) 256.5 241.5 332 287.5

Experimental Result for Case A ~ Case D

11

The relationship between efficiency and time

0

100

200

300

400

500

600

0 100 200 300 400 500 600 700

經過時間 (min)

壓降

(P

a)

A

B

C

D

0.4 m/s 0.4 m/s 0.25 m/s 0.25 m/s

PAO=50 μg/L

PAO=25 μg/L

PAO=50 μg/L

PAO=25 μg/L

The relationship between pressure drop and

time


99.984

99.986

99.988

99.990

99.992

99.994

99.996

99.998

100.000

0 2 4 6 8 10

經過時間(hr)

效率

(%

)

E

F

G

99.984

99.986

99.988

99.990

99.992

99.994

99.996

99.998

100.000

0 100 200 300 400 500

壓降(Pa)

效率

(%

)

E

F

G

12

Efficiency vs. Pressure drop

(Case E ~ Case G)

Efficiency vs. Pressure drop

(Case H ~ Case J)

Test time vs. Pressure drop

(Case E ~ Case G)

Test time vs. Pressure drop

(Case H ~ Case J)

0.25 m/s

50 μg/L

0.4 m/s

50 μg/L

0.25 m/s

50 μg/L

0.4 m/s

50 μg/L


0

50

100

150

200

250

300

350

0 100 200 300 400 500 600

經過時間(min)

容塵

量

(g)

E

F

G0

50

100

150

200

250

300

350

0 100 200 300 400 500 600

壓降 (Pa)

容塵

量

(g)

E

F

G

0

50

100

150

200

250

300

350

0 100 200 300 400

經過時間(min)

容塵

量

(g)

H

I

J0

50

100

150

200

250

300

350

0 100 200 300 400 500 600

壓降 (Pa)

容塵

量

(g)

H

I

J

13

Dust holding capacity vs. Test time

(Case H ~ Case J)

Dust holding capacity vs. Pressure drop

(Case H ~ Case J)

Dust holding capacity vs. Test time

(Case E ~ Case G)

Dust holding capacity vs. Pressure drop

(Case E ~ Case G)

0.4 m/s

50 μg/L

0.4 m/s

50 μg/L

0.25 m/s

50 μg/L

0.25 m/s

50 μg/L


0

50

100

150

200

250

300

350

0 100 200 300 400 500 600

經過時間(min)

容塵

量

(g)

E

F

G

H

I

J

14

Dust holding capacity (Case E ~ Case J)

Different wind speed dust holding capacity of the time diagram

case Dust(g)

E 310

F 308

G 308

H 288.5

I 280

J 277

E~G 0.25 m/s、50 μg/L

H~J 0.4m/s、50 μg/L


y = 0.8092x - 10.243

R2 = 0.9987

0

100

200

300

400

500

600

700

0 100 200 300 400 500 600 700 800

經過時間 (min)

容塵

量

(g)

N 117mm M 78mm

L 69mm K 50mm

K,L,M,N趨勢線

99.994

99.995

99.996

99.997

99.998

99.999

100.000

0 100 200 300 400 500 600

壓降 (Pa)

效率

(%

)

N 117mm

M 78mm

L 69mm

K 50mm

99.994

99.995

99.996

99.997

99.998

99.999

100.000

0 2 4 6 8 10 12 14經過時間 (hr)

效率

(%

)

N 117mm

M 78mm

L 69mm

K 50mm

0

100

200

300

400

500

600

700

0 100 200 300 400 500

增加的壓降(Pa)

容塵

量

(g)

N 117mm

M 78mm

L 69mm

K 50mm

Pressure drop vs. Filter efficiency

(Case K ~ Case N)

Test time vs. Filter efficiency

(Case K ~ Case N)

Test time vs. Dust holding capacity

(Case K ~ Case N)

Pressure drop vs. Dust holding capacity

(Case K ~ Case N)


Result and discussion

• The efficiency of HEPA filter increases with lower filter surface velocity.

• Increase the thickness of filter media pack can reduce the pressure drop and

increase the dust holding capacity (DHC).

• In extreme condition, the penetration rate of HEPA filter will increase due to the

higher pressure drop.

16

超高效過濾器的容塵量比較研究 · iso 50 u ─ ≧99.999 iso 55 u u15 ≧99.9995 iso 60...

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