Transcript Seite 1 - אחים פולק - מפוחים, משאבות

Comparison Ejectors - Vacuum pumps
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Basic design of an ejector
Design of the complete system
Example:
comparison of air flow / energy consumption
Comparison of different working principles
Extract from „Druckluft effizient“
Basic design of an ejector
2
1
6
5
3
4
1 Compressed air
2 Nozzle
3 Suction pipe
4 Vacuum connection
5 Inlet filter
6 Exhaust air
Basic design of a multi-stage ejector
(company PIAB)
1 Compressed air
2 Nozzles
3 Suction pipes
4 Vacuum connection
Complete system of an ejector
Compressed-air reservoir
Oil separator
Compressor 6 bar
Cooling dryer
Ejector
Inlet Filter
Complete system of an ejector
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The ejector has no energy consumption
 The compressor has a very high energy consumption
(Compressed air is expensive energy)
The ejector is maintenance-free
 The compressor station is very maintanance-intensive
(Most common are oil-lubricated screw-compressors
with half-yearly maintenance)
The ejector has no heat convection
 The compressor (often in separate room) has the heat
convection. Also the exhaust air of the ejector affects its
surrounding of the production machines
 Anyhow the vacuum pump can be installed in a separate
room as well or the outgoing air can be ducted out of
the machine
Complete system of the ejector
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The ejector requires no space
 The compressor station requires much more space than the
vacuum pump
The ejector is oil-free
 The compressor is mostly oil-lubricated and the compressed
air requires an intensive filtration (oil separator, cooling dryer)
The exhaust air of the ejector is cold
 The cooling dryer cools the compressed air of the
compressor, the exhaust air of a vacuum pump can
be cooled by a heat exchanger as well
Complete system of the ejector
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Ejectors do have a high efficency
 Compressed air is „expensive energy“
 Refer to the comparison of the different working principles
Ejectors have short evacuuation and reaction times
 The times of evacuation and reaction are much shorter with
vacuum pumps
Ejectors are very safe in operation
 The operating safety depends on the complete system,
not only on the ejector
Example
Ejector Type M100L (PIAB)
Vacuum pumps Types KVT 3.60 and VT 4.16 (BECKER)
BECKER KVT 3.60
PIAB M 100 L
BECKER VT 4.16
Example:
Comparison of air flow
Ejector Type M100L (PIAB)
Vacuum pumps Types KVT 3.60 and VT 4.16 (BECKER)
Suction pressure
Suction pressure
free flow
at -0,7 bar (300 mbar abs)
Type
l/s
l/min
m³/h
l/s
l/min
m³/h
KVT 3.60 50 Hz
15,28
916,7
55,0
3,33
200,0
12,0
VT 4.16 50 Hz
4,44
266,7
16,0
0,83
50,0
3,0
M 100 L (6 bar)
15,50
930,0
55,8
0,67
40,2
2,4
Data from Becker data sheet
Data from PIAB data sheet
Example:
Comparison of air flow
BECKER KVT 3.60 50 Hz
BECKER VT 4.16
PIAB M 100 L
Example:
Comparison of energy consumption
Ejector Typ M100L (PIAB)
Vacuum pumps Types KVT 3.60 and VT 4.16 (BECKER)
Requirement of
compressed air 6 bar
Requirement of power
free flow
at -0,7 bar (300
mbar abs)
free flow
at -0,7 bar (300
mbar abs)
l/s
l/s
KW
KW
KVT 3.60 50 Hz
-
-
1,24
1,5
VT 4.16 50 Hz
-
-
0,41
0,43
M 100 L (6 bar)
12
12
4,8*
4,8*
Type
Data from Becker data sheet
Data from PIAB data sheet
* 2,5 l/s @ 6 bar compressed air = 1 KW
(Reference: Internet Atlas Copco)
Example:
Comparison energy consumption
BECKER KVT 3.60 50 Hz
BECKER VT 4.16
PIAB M 100 L
Example:
Saving of energy
Difference = Saving:
(4,8 - 0,43) KW = 4,37 KW
4,37 KW x 0,1 €
/ KWh*
= 0,44 €
/h
0,44 €
/h x 16 h / day**
= 7,04 €
/day
7,04 €
/day x 250 days / year
= 1.760 €
/year
* 1 KWh = 0,1 €
** 2-shift-operation
Comparison of different working
principles
Oil-free rotary-vane-vacuum pump VTLF 250
(Becker)
Multi-stage sidechannel-vacuumpump COVAC 300
(Rietschle Thomas)
2-stage Side channel vacuum pump SV 5.690/2
(Becker)
Ejector EJ V 864 (with 6 bar compressed air)
(PIAB)
Comparison of different working
principles
Intake flow rate / Vacuum
450
Intake flow rate in m3/h
400
350
VTLF 250 5H
300
COVAC 50 Hz
250
EJ V~864 +6
200
SV 5.690/2 100
150
100
50
0
0
100
200
300
400
500
Vacuum in mbar
600
700
800
900
For internal use only. Do not leave with customer.
Comparison of different working
principles
Power consumption / Vacuum
Power consumption in kW
30
25
VTLF 250 5H
20
COVAC 50 Hz
EJ V~864 +6
15
SV 5.690/2 100
10
5
0
0
100
200
300
400
500
Vacuum in mbar
600
700
800
900
For internal use only. Do not leave with customer.
Comparison of different working
principles
Efficiency / Vacuum
70
Efficiency in %
60
VTLF 250 5H
COVAC 50 Hz
50
EJ V~864 +6
SV 5.690/2 100
40
30
20
10
0
0
100
200
300
400
500
Vacuum in mbar
600
700
800
900
For internal use only. Do not leave with customer.
The working group ”Druckluft effizient“ would like to
inform plant engineers and users of compressed air
about the possibilities to save costs and energy as well
motivate the users to realize the potential savings.
The different ways to optimize the technical applications
of compressed air from the planing to processing and
from distributing to and financing will be identified and
then will be shown in so called ”fact sheets“.
Additional informationen from: www.druckluft-effizient.de
Extract from the factsheet ”Applications“ of